KR102010812B1

KR102010812B1 - Optical element and display device comprising thereof

Info

Publication number: KR102010812B1
Application number: KR1020150134893A
Authority: KR
Inventors: 김선국; 박문수; 윤혁; 이성민
Original assignee: 주식회사 엘지화학
Priority date: 2015-09-23
Filing date: 2015-09-23
Publication date: 2019-08-14
Also published as: KR20170035687A

Abstract

The present application relates to an optical member and a display device including the same.
The optical member and the display device including the same according to the present application are more economical than the optical film manufactured in the form of a large area, have high durability, and at the same time can effectively secure the desired optical properties.

Description

Optical element and display device comprising the same

The present application relates to an optical member and a display device including the same.

Lighting devices are used for a variety of applications. The lighting device is, for example, a BLU of a display such as a liquid crystal display (LCD), a TV, a computer, a mobile phone, a smartphone, a personal digital assistant (PDA), a gaming device, an electronic reading device or a digital camera. Can be used as (Backlight Unit). In addition, the lighting device may be used for indoor or outdoor lighting, stage lighting, decorative lighting, accent lighting or museum lighting, and the like, and may also be used for special wavelength lighting required in horticulture or biology.

Recently, studies on lighting devices that emit white light using wavelength-converting particles, for example, quantum dots, which vary in color of light emitted according to particle size, have been steadily being conducted. In particular, various studies have been conducted to increase color purity in relation to lighting devices including quantum dots.

On the other hand, in the manufacture of a lighting device using a film using a quantum dot, various attempts have been made to secure the desired optical properties while saving the cost in the manufacturing of the film including the quantum dot.

Representatively, Korean Patent Application Laid-Open Publication No. 2014-0024740 discloses an edge type display device in which a quantum rail layer is disposed between a light source and a light guide plate, but the quantum rail layer of the display device is closer to the light source. dot) deteriorates, and there is a certain difficulty in securing desired optical characteristics and the like.

Patent Document 1: Republic of Korea Patent Publication No. 2014-0023740

The present application overcomes the disadvantages of the cost of a display device including a large area quantum dot sheet, can achieve the desired excellent optical properties, and furthermore, an optical member and a display device comprising the same To provide.

The present application has been made to solve the above problems, a light source unit including a light source; And an optical film disposed adjacent to the light source portion. The optical film includes a wavelength converting layer including wavelength converting particles and a barrier film existing on both surfaces of the wavelength converting layer.

The wavelength conversion layer is, for example, a first wavelength conversion particle that absorbs light of any wavelength within the range of 420 nm to 490 nm and emits light of any wavelength within the range of 490 nm to 580 nm and / or within the range of 420 nm to 490 nm. It may include a second wavelength conversion particle that absorbs light of any wavelength, and emits light of any wavelength in the range of 580nm to 780nm. The first wavelength converting particle may mean the green particle described above, and the second wavelength converting particle may mean the red particle described above.

In one embodiment, the wavelength converting layer comprises a first layer and 420 comprising first wavelength converting particles that absorb light of any wavelength within a range of 420 nm to 490 nm and emit light of any wavelength within a range of 490 nm to 580 nm. It may have a second layer comprising second wavelength converting particles that absorb light of any wavelength in the range of nm to 490 nm and emit light of any wavelength in the range of 580 nm to 780 nm.

The wavelength conversion layer may include a matrix in the continuous phase and an emulsion region dispersed in the matrix in the continuous phase. In addition, wavelength converting particles may be present in the continuous or emulsion region.

The optical film may further include, for example, a reflection layer existing on one or both surfaces of the wavelength conversion layer. The reflection layer has a central wavelength λ _o of the reflected light determined according to Equation 2 below 420 nm to 510 nm. Or a cholesteric liquid crystal layer in the range of 490 nm to 780 nm.

[Formula 2]

λ _o = n × p × cosθ

In Equation 2, λ is the central wavelength of the reflected light of the cholesteric liquid crystal layer, n is the average refractive index of the cholesteric liquid crystal layer, p is the pitch of the cholesteric liquid crystal layer, θ is the cholesteric liquid crystal layer The incident angle (unit: degree) of light incident on the cholesteric liquid crystal layer measured based on the normal of the surface.

The present application also relates to a display device including the optical member.

The present application can provide an optical member and a display device including the same that can overcome the disadvantages of the cost of the display device including a large area quantum dot sheet.

The present application can also provide an optical member and a display device including the same, which can achieve the desired excellence of optical characteristics and further ensure high durability.

1 and 2 show an example of a perspective view of an optical member according to the present application.
3 illustrates an example of a perspective view of a light guide plate according to the present application.
4 is a schematic view for explaining the position of the optical film and the light guide plate according to the present application.
5, 6 and 10 show an example of an optical film according to the present application.
7 to 9 show an example of a barrier film according to the present application.

Although the present application will be described in more detail below, the present application is not limited to the process conditions set forth below, and may be arbitrarily selected within the range of conditions necessary to achieve the object of the present application. Self-explanatory to those who have knowledge.

In general, the case where the light source is directly positioned on the surface of the liquid crystal panel is called a direct type, and the case where the light source is not directly positioned on the surface of the liquid crystal panel is located on both sides or any one edge. type).

The optical member according to the present application includes a light source unit and an optical film disposed adjacent to the light source unit, for example, to serve as a backlight unit of a display device, specifically, an edge type backlight unit, or the like. Can be one.

The optical member according to the present application may include an optical film disposed adjacent to the light source unit, thereby overcoming cost constraints due to the large area of the optical film.

The optical member according to the present application further includes an optical film having excellent durability while securing desired optical properties, thereby preventing damage to wavelength converting particles that may occur as the optical film approaches a light source, and thus deteriorating optical properties. It can prevent.

That is, the present application is a light source unit including a light source; And an optical film disposed adjacent to the light source unit. The optical film includes a wavelength converting layer including wavelength converting particles and a barrier film existing on both surfaces of the wavelength converting layer.

1 is an example of a perspective view of an optical member according to the present application.

As shown in FIG. 1, the optical member 1000 according to the present application includes a light source unit 100 including a light source 101; And an optical film 200 disposed adjacent to the light source unit 100.

In addition, as shown in FIG. 4, the optical film 200 includes a wavelength conversion layer 201 including wavelength conversion particles and a barrier film 202 formed on both surfaces of the wavelength conversion layer 201. And positioned between the light source unit 100 and the light guide plate 300.

The light source unit according to the present application includes at least one light source. Since the display device using the liquid crystal panel does not have self-luminous ability, an appropriate light source is required, and the light emitted from the light source unit passes through the light guide plate, and may serve to inject white light into the liquid crystal panel. That is, the light of the light source unit may have an appropriate wavelength so that white light may be incident on the liquid crystal panel of the display device.

In one example, the light source of the light source unit may be to emit light of any wavelength in the range of 420nm to 490nm.

The optical member according to the present application may also include a light guide plate.

In one example, the optical member may include a light source unit 100, as shown in FIG. 2; A light guide plate 300 arranged to guide light from the light source unit to the liquid crystal panel; And an optical film 200 positioned between the light source unit 100 and the light guide plate 300 and disposed adjacent to the light source unit 100.

The light guide plate may change the point light source from the light source unit into a planar light source to perform incident on the liquid crystal panel. That is, the light output distribution emitted from the light source has a point light source shape, and the light source passing through the light guide plate is diffused through the light guide plate and can be emitted with the light output distribution in the form of a surface light source on the upper surface of the light guide plate facing the liquid crystal panel. have.

In one example, as shown in FIG. 3, the light guide plate 300 may include a light incident surface 301 and a light emitting surface 302. In detail, the light incident surface 301 may be formed in an area corresponding to the light source unit, and the light emitting surface 302 may serve to guide light passing through the light incident surface to the liquid crystal panel. .

The light incident surface of the light guide plate may be formed, for example, on one side or both side surfaces of the light guide plate. In addition, the light exit surface of the light guide plate may be formed on, for example, an upper surface perpendicular to the light incident surface of the light guide plate and parallel to the bottom surface of the light guide plate. The light exit surface can emit light incident through the light incident surface into a liquid crystal panel, and the light exits from the light exit surface is substantially perpendicular to the light exit surface, and the light intensity is generally It can be distributed uniformly.

The optical member according to the present application includes an optical film. The optical film is disposed adjacent to the light source portion.

In the present application, the term “optical film is disposed adjacent to the light source unit” means that no layer is placed between the light source unit and the optical film, or even a part such as a constant layer, for example, a transparent heat insulator or the like, is disposed. It means the state whose distance between films is 5,000 micrometers or less. Another example of the distance in which the optical film is disposed adjacent to the light source unit may include 3,000 μm or less, 2,000 μm or less, 1,000 μm or less, or 500 μm or less.

The optical member of the present application may overcome the disadvantages of the cost side due to the large area of the optical film by arranging the light source unit and the optical film adjacently.

The term "optical film" in the present application means a film that is formed to absorb light of any wavelength and emit light of the same or different wavelengths.

In one example, the optical film may be formed such that the light transmitting area of the optical film and the light incident surface area of the light guide plate correspond to each other.

In the present application, the term “the optical film is formed to correspond to the light incident surface region of the light guide plate” refers to the light incident region of the optical film 200 and the light incident plate 300 as shown in FIG. 4. It means that the area of the surface 301 is formed to correspond. As such, in a batch form, it is possible to achieve a cost saving effect by reducing the amount of the desired optical film.

The optical film includes a wavelength conversion layer and barrier films formed on both surfaces of the wavelength conversion layer. Specifically, as shown in FIG. 5, the optical film 200 according to the present application includes a wavelength conversion layer 201 and barrier films 202 formed on both surfaces of the wavelength conversion layer 201. In addition, the optical film may further include a sealing unit 204 for sealing the wavelength conversion layer 201 on the side surface of the wavelength conversion layer 201 where the barrier film 202 is not formed. have.

The wavelength conversion layer contains wavelength conversion particles. The term "wavelength converting particle" in the present application means a nanoparticle formed to absorb light of any wavelength and emit light of the same or different wavelengths.

In the present application, the term "nanoparticle" is a particle having a nano-level dimension, for example, an average particle diameter of about 100 nm or less, 90 nm or less, 80 nm or less, 70 nm or less, 60 nm or less, It may mean particles that are 50 nm or less, 40 nm or less, 30 nm or less, 20 nm or less, or about 15 nm or less. The shape of the nanoparticles is not particularly limited, and may be spherical, ellipsoidal, polygonal or amorphous.

The wavelength conversion particle may be a particle capable of absorbing light of a predetermined wavelength and emitting light of the same or different wavelength. For example, the wavelength conversion particles may be referred to as particles (hereinafter, referred to as green particles) capable of absorbing light of any wavelength within a range of 420 to 490 nm to emit light of any wavelength within a range of 490 to 580 nm. ) Or particles capable of absorbing light of any wavelength within a range of 420 to 490 nm to emit light of any wavelength within a range of 580 to 780 nm (hereinafter, may be referred to as red particles).

For example, the red particles and / or the green particles may be included in the wavelength conversion layer together in an appropriate ratio to obtain an optical film capable of emitting white light. As the wavelength converting particle, any one that exhibits such a function can be used without particular limitation. Representative examples of such particles include, but are not limited to, a nanostructure called a quantum dot.

In the present application, for convenience, referred to as wavelength converting particles, the wavelength converting particles may be in the form of particles, for example, nanowires, nanorods, nanotubes, branched nanostructures, nanonotetrapods, and tripods. ) Or bipods, and the like, which may also be included in the wavelength conversion particles defined in the present application. As used herein, the term "nanostructure" includes at least one area or characteristic dimension having a dimension of less than about 500 nm, less than about 200 nm, less than about 100 nm, less than about 50 nm, less than about 20 nm, or less than about 10 nm. Branches may include similar structures. In general, area or characteristic dimensions may exist along the smallest axis of the structure, but are not limited thereto. The nanostructures can be, for example, substantially crystalline, substantially monocrystalline, polycrystalline or amorphous, or combinations of the above.

Quantum dots that can be used as wavelength converting particles can be prepared in any known manner. For example, suitable methods for forming quantum dots are described in US Pat. No. 6,225,198, US Patent Publication 2002-0066401, US Pat. No. 6,207,229, US Pat. No. 6,322,901, US Pat. No. 6,949,206, US Pat. No. 7,572,393. , US Pat. No. 7,267,865, US Pat. No. 7,374,807 or US Pat. No. 6,861,155, and the like, and various other known methods may be applied to the present application.

Quantum dots or other nanoparticles that may be used in the present application may be formed using any suitable material, for example, an inorganic conductive or semiconducting material, as an inorganic material. Suitable semiconductor materials can be exemplified by Group II-VI, III-V, IV-VI and Group IV semiconductors. Specifically, Si, Ge, Sn, Se, Te, B, C (including diamond), P, BN, BP, BAs, AlN, AlP, AlAs, AlSb, GaN, GaP, GaAs, GaSb, InN, InP, InAs, InSb, AlN, AlP, AlAs, AlSb, GaN, GaP, GaAs, GaSb, ZnO, ZnS, ZnSe, ZnTe, CdS, CdSe, CdSeZn, CdTe, HgS, HgSe, HgTe, BeS, BeSe, BeTe, Mg MgSe, GeS, GeSe, GeTe, SnS, SnSe, SnTe, PbO, PbS, PbSe, PbTe, CuF, CuCl, CuBr, CuI, Si ₃ N ₄ , Ge ₃ N ₄ , Al ₂ O ₃ , (Al, Ga, In) ₂ (S, Se, Te) ₃ , Al ₂ CO and suitable combinations of two or more of the above semiconductors may be illustrated, but are not limited thereto.

In one example, the semiconductor nanocrystal or other nanostructure may include a dopant, such as a p-type dopant or an n-type dopant. Nanoparticles that may be used in the present application may also include II-VI or III-V semiconductors. Examples of II-VI or III-V semiconductor nanocrystals and nanostructures include any combination of periodic table group elements, such as Zn, Cd, and Hg, with periodic table group VI elements, such as S, Se, Te, Po, and the like; And any combination of group III elements, such as B, Al, Ga, In, and Tl, and group V elements, such as N, P, As, Sb, Bi, and the like, but is not limited thereto. In other examples suitable inorganic nanostructures include metal nanostructures, and suitable metals include Ru, Pd, Pt, Ni, W, Ta, Co, Mo, Ir, Re, Rh, Hf, Nb, Au, Ag, Ti , Sn, Zn, Fe or FePt and the like can be exemplified, but is not limited thereto.

Wavelength converting particles, eg, quantum dots, may have a core-shell structure. Exemplary materials capable of forming core-cell structured wavelength converting particles include Si, Ge, Sn, Se, Te, B, C (including diamond), P, Co, Au, BN, BP, BAs, AlN, AlP , AlAs, AlSb, GaN, GaP, GaAs, GaSb, InN, InP, InAs, InSb, AlN, AlP, AlAs, AlSb, GaN, GaP, GaAs, GaSb, ZnO, ZnS, ZnSe, ZnTe, CdS, CdSe, CdSeZn , CdTe, HgS, HgSe, HgTe, BeS, BeSe, BeTe, MgS, MgSe, GeS, GeSe, GeTe, SnS, SnSe, SnTe, PbO, PbS, PbSe, PbTe, CuF, CuCl, CuBr, CuI, Si ₃ N ₄ , Ge ₃ N ₄ , Al ₂ O ₃ , (Al, Ga, In) ₂ (S, Se, Te) ₃ , Al ₂ CO and any combination of two or more such materials, including but not limited to no.

Exemplary core-cell wavelength converting particles (core / cell) applicable in this application include, but are not limited to, CdSe / ZnS, InP / ZnS, PbSe / PbS, CdSe / CdS, CdTe / CdS or CdTe / ZnS, etc. It is not.

In addition, the wavelength conversion particle may be a polymer particle made of an organic material. The type and size of the polymer particles made of the organic material may be used without limitation, for example, those known in the Republic of Korea Patent Application Publication No. 2014-0137676.

The specific kind of the wavelength conversion particle is not particularly limited and may be appropriately selected in consideration of desired light emission characteristics.

In one example, the wavelength converting particles may be surrounded by one or more ligands or barriers. The ligand or barrier may be advantageous for improving the stability of the wavelength converting particles and protecting the wavelength converting particles from harmful external conditions including high temperature, high intensity, external gas or moisture, and the like. In addition, as will be described later, the wavelength conversion particles may exist only in any one of the matrix or emulsion region in the continuous phase, and in order to obtain such a wavelength conversion layer, any one of the matrix and emulsion regions in which the characteristic of the ligand or the barrier is in the continuous phase. It may be chosen to have compatibility only in the region.

In specific examples, the wavelength converting particles may include ligands conjugated, cooperative, associated or attached to their surface. Ligands and methods for forming the same are known in the art to enable the display of suitable properties on the surface of the wavelength converting particles, and such methods can be applied without limitation in the present application. Such materials or methods are described, for example, in US Patent Publication No. 2008-0281010, US Publication No. 2008-0237540, US Publication No. 2010-0110728, US Publication No. 2008-0118755, US Patent No. 7,645,397 US Pat. No. 7,374,807, US Pat. No. 6,949,206, US Pat. No. 7,572,393, US Pat. No. 7,267,875, and the like, but are not limited thereto. In one example, the ligand may be a molecule having an amine group (oleylamine, triethylamine, hexylamine, naphtylamine, etc.) or a polymer, a molecule having a carboxyl group (oleic acid, etc.) or a polymer, a molecule having a thiol group (butanethiol, hexanethiol, dodecanethiol, etc.) or Polymer, molecule having pyridine group (pyridine etc.) or polymer, molecule having phosphine group (triphenylphosphine etc.), molecule having phosphine group (trioctylphosphine oxide etc.), molecule having carbonyl group (alkyl ketone etc.), benzene ring It may be formed of a molecule (benzene, styrene, etc.) or a polymer, a molecule having a hydroxyl group (butanol, hexanol, etc.) or a polymer, but is not limited thereto.

The wavelength conversion layer included in the optical film may include the aforementioned wavelength conversion particles, specifically green particles and / or red particles.

In one example, the wavelength converting layer absorbs light of any wavelength within the range of 420 nm to 490 nm, and / or the first wavelength converting particle and / or the range of 420 nm to 490 nm that emits light of any wavelength within the range of 490 nm to 580 nm. It may include a second wavelength conversion particle that absorbs light of any wavelength within, and emits light of any wavelength within the range of 580 to 780 nm.

In a specific example, the wavelength conversion layer includes green particles in an appropriate ratio, and when the light from the light source unit is incident on the wavelength conversion layer, for example, light of any wavelength within the range of 420 nm to 490 nm, the wavelength conversion layer is included. The optical film can make white light inject into the light-incidence surface of a light guide plate. In addition, when the wavelength conversion layer contains red particles at an appropriate ratio, and the light from the light source unit is incident on the wavelength conversion layer, for example, light of any wavelength within the range of 420 nm to 490 nm, the optical including the wavelength conversion layer. The film can cause white light to enter the light incident surface of the light guide plate. Furthermore, when the green particles and the red particles are simultaneously included in an appropriate ratio, and light of any wavelength within the range of 420 nm to 490 nm is incident on the wavelength conversion layer, the optical film including the wavelength conversion layer is light incident on the light guide plate. White light can be incident on the surface.

The manner of forming the wavelength conversion layer is not particularly limited. For example, the mixture including the wavelength conversion particles described above may be formed by coating on a suitable substrate by a known coating method. The method of curing the layer formed in the above manner is not particularly limited, for example, applying an appropriate range of heat to activate the initiator contained in each composition, or applying electromagnetic waves such as ultraviolet rays. This can be done in a way.

The wavelength conversion layer may include, for example, green particles and red particles at the same time. As the method of simultaneously including the green particles and the red particles, for example, a method of properly distributing the green particles and the red particles in one wavelength conversion layer may be used, or the layer including the green particles and the red particles may be used. The containing layer may be comprised as a separate layer.

In one example, the wavelength converting layer includes a first layer and 420 including first wavelength converting particles that absorb light of any wavelength within a range of 420 nm to 490 nm and emit light of any wavelength within a range of 490 nm to 580 nm. It may have a second layer comprising second wavelength converting particles that absorb light of any wavelength in the range of nm to 490 nm and emit light of any wavelength in the range of 580 nm to 780 nm.

Specifically, as shown in FIG. 6, the optical film 200 according to the present application includes a wavelength conversion layer including a first layer 201b including green particles and a second layer 201a including red particles. It may have a structure including a barrier film 202 on both sides of the (201).

As described above, when the optical film including the wavelength conversion layer including the first layer and the second layer is disposed between the light source unit and the light guide plate, white light may be incident on the light incident surface of the light guide plate.

In another example, the wavelength conversion layer may include green particles and red particles in one layer, and the single layer may include regions separated from each other.

In the present application, the term "phase-separated regions", for example, a region formed by two regions that are not mixed with each other, such as a relatively hydrophobic region and a relatively hydrophilic region, it can be seen that it is separated from each other. It may mean areas formed in a state. Hereinafter, for convenience, one of the two regions separated in phase of the wavelength conversion layer may be referred to as the first region, and the other region may be referred to as the second region.

In a specific example, the wavelength conversion layer may include a first region and a second region that is phase-separated from the first region.

In one example, a first region may be a hydrophilic region, and a second region may be a hydrophobic region among the first region and the second region of the wavelength conversion layer. In the present application, hydrophilicity and hydrophobicity distinguishing the first and second regions are relative to each other, and an absolute criterion for hydrophilicity and hydrophobicity is that the two regions are separated from each other in the wavelength conversion layer. It is not particularly limited.

In the wavelength conversion layer, the wavelength conversion particles may be included in the first region or the second region.

In one example, the wavelength conversion particle may be included only in one of the first and second regions, for example, the second region, and may not be substantially included in another region, for example, the first region.

In the present application, the wavelength conversion particles are not included in any region, for example, based on the total weight of the wavelength conversion particles included in the wavelength conversion layer, the weight ratio of the wavelength conversion particles included in the corresponding region is 10. It will mean the following:% or less, 9% or less, 8% or less, 7% or less, 6% or less, 5% or less, 4% or less, 3% or less, 2% or less, 1% or less, 0.5% or less, or 0.1% or less. Can be.

In one example, the weight ratio of the wavelength conversion particles included in the first region of the wavelength conversion layer may be 10% or less than the total wavelength conversion particles included in the wavelength conversion layer.

By forming two phase-separated regions in the wavelength conversion layer and substantially placing the wavelength conversion particles in only one of the two regions, it is possible to secure physical properties suitable for film formation, and the wavelength conversion layer such as a barrier film to be described later. It is advantageous to secure adhesion between the other layer and the wavelength conversion layer in contact with each other, and other factors that may adversely affect the physical properties of the nanoparticles, such as an initiator or a crosslinking agent, in the region where the wavelength conversion particles are present in forming the optical film. Effective control can form a film having excellent durability.

The ratio of the hydrophilic first region and the hydrophobic second region in the wavelength conversion layer is not particularly limited. For example, the ratio may be selected in consideration of the ratio of the wavelength conversion particles to be included in the wavelength conversion layer, the adhesion with other layers such as a barrier film, or the physical properties required for film formation. For example, the wavelength conversion layer may include a second region of 10 parts by weight to 100 parts by weight with respect to 100 parts by weight of the first region. In another example, the wavelength conversion layer may include 50 to 95 parts by weight of the first region and 5 to 50 parts by weight of the second region. Alternatively, the wavelength conversion layer may include 50 to 95 parts by weight of the second region and 5 to 50 parts by weight of the first region. The term weight part in the present application means a weight ratio between components, unless otherwise specified. In addition, the weight of the first and second regions may mean the sum of the weights of all the components that form each region or included in the region.

For example, the wavelength conversion layer may be formed by mixing and polymerizing a hydrophilic polymerizable composition and a relatively hydrophobic polymerizable composition as described below. In this case, the weight of each of the regions is the polymerizable composition. It may mean the weight or the ratio between the hydrophilic radical polymerizable compound and the hydrophobic radical polymerizable compound included in each composition.

The hydrophilic polymerizable composition may mean a composition containing a hydrophilic radical polymerizable compound as a main component, and the hydrophobic polymerizable composition may mean a composition containing a hydrophobic radical polymerizable compound as a main component.

Included as the main component in the present application, the ratio of the weight of the component included as the main component based on the total weight is at least 55% by weight, at least 60% by weight, at least 65% by weight, at least 70% by weight, at least 75% by weight, 80 It may mean when the weight percent or more, 85 weight% or more, or 95 weight% or more.

In the present application, the criteria for distinguishing the hydrophilicity and hydrophobicity of the hydrophilic radically polymerizable compound and the hydrophobic radically polymerizable compound are, for example, the aforementioned phase-separated regions when the two compounds are relatively hydrophilic or hydrophobic and mixed with each other. There is no particular limitation as long as it can form.

In one example, the separation of hydrophilicity and hydrophobicity may be performed by so-called solubility parameters. The solubility parameter in the present application means a solubility parameter of a homopolymer formed by polymerization of the polymerizable compound, and through this, the degree of hydrophilicity and hydrophobicity of the compound can be determined. The manner of obtaining the solubility parameter is not particularly limited and may be in accordance with methods known in the art. For example, the parameter may be calculated or obtained according to a method known in the art as a so-called Hansen solubility parameter (HSP). Although not particularly limited, in the present application, the hydrophobic polymerizable compound may mean a polymerizable compound capable of forming a polymer having a solubility parameter of less than about 10 (cal / cm ³ ) ^{1/2 by} polymerization, and may be hydrophilic. The polymerizable compound may mean a polymerizable compound capable of forming a polymer having the above parameter by about 10 (cal / cm ³ ) ^1/2 or more by polymerization. The solubility parameter of the polymer formed by the hydrophobic polymerizable compound is, in another example, 3 (cal / cm ³ ) ^1/2 or more, 4 (cal / cm ³ ) ^1/2 or more or about 5 (cal / cm ³ ) ^{1 / It} may be ^{two or} more. The solubility parameter of the polymer formed by the hydrophilic polymerizable compound is, in another example, about 11 (cal / cm ³ ) ^1/2 or more, 12 (cal / cm ³ ) ^1/2 or more, 13 (cal / cm ³ ) ^{1 / 2} or more, 14 (cal / cm ³ ) ^1/2 or more, or 15 (cal / cm ³ ) ^{1/2 or} more. The solubility parameter of the polymer formed by the hydrophilic polymerizable compound is, in another example, about 40 (cal / cm ³ ) ^1/2 or less, about 35 (cal / cm ³ ) ^1/2 or less or about 30 (cal / cm ³ ). ^It may be ^1/2 or less. Differences in the solubility parameters of the hydrophobic and hydrophilic compounds can be controlled to achieve proper phase separation or emulsion structures. In one example, the difference in solubility parameters of the hydrophilic and hydrophobic polymerizable compounds or the polymer formed by each of them may be 5 (cal / cm ³ ) ^1/2 or more, 6 (cal / cm ³ ) ^1/2 or more, 7 (cal / cm ³ ) ^1/2 or more, or about 8 (cal / cm ³ ) ^{1/2 or} more. The difference is the value of the solubility parameter minus the small value. The upper limit of the difference is not particularly limited. The greater the difference in solubility parameters, the more suitable phase separation or emulsion structures can be formed. The upper limit of the difference may be, for example, 30 (cal / cm ³ ) ^1/2 or less, 25 (cal / cm ³ ) ^1/2 or less, or about 20 (cal / cm ³ ) ^1/2 or less. In the case where any of the physical properties described herein is a physical property that changes with temperature, the physical property may mean physical properties at room temperature. As used herein, the term room temperature is a natural temperature that is not heated or reduced, and may mean, for example, any temperature in the range of about 10 ° C to 30 ° C, about 23 ° C, or about 25 ° C.

The first region and the second region may be randomly distributed, forming a cluster enough to confirm that the two regions are separated in the wavelength conversion layer.

In one example, the wavelength conversion layer may be an emulsion type layer.

In the present application, a layer in the form of an emulsion means that any one of two or more phases (eg, the first and second regions) that do not mix with each other is a continuous phase in the layer. The other region may mean a layer having a form dispersed in the continuous phase to form a dispersed phase. In the above, the continuous phase and the dispersed phase may be solid, semi-solid or liquid phase, respectively, and may be the same phase or different phases. Generally, emulsion is a term mainly used for two or more liquid phases which are not mixed with each other, but the term emulsion in the present application does not necessarily mean an emulsion formed by two or more liquid phases.

In one example, the wavelength conversion layer may include a matrix forming the continuous phase, and may include an emulsion region that is a dispersed phase dispersed in the matrix. Wherein the matrix is any one of the above-described first and second regions (eg, the first region), and the emulsion region, which is a dispersed phase, is the other of the first and second regions (eg, the second region). Area). That is, the wavelength conversion layer may include a matrix in the continuous phase and an emulsion region dispersed in the matrix in the continuous phase.

The emulsion region may be in the form of particles. That is, the emulsion region may be dispersed in the matrix in the form of particles. In this case, the particle shape of the emulsion region is not particularly limited and may be approximately spherical, ellipsoidal, polygonal or amorphous. The average diameter of the particle form may be in the range of about 1 μm to 200 μm, in the range of about 1 μm to 50 μm or in the range of about 50 μm to 200 μm. The size of the particle form can be controlled by adjusting the proportion of materials forming the matrix and emulsion regions, or by using a surfactant or the like.

The ratio of matrix and emulsion regions in the wavelength conversion layer is For example, the ratio of the wavelength conversion particles to be included in the wavelength conversion layer, the adhesion with other layers such as a barrier layer, the production efficiency of the emulsion structure which is a phase-separated structure, or the physical properties required for film formation are selected. Can be. For example, the wavelength conversion layer may include 5 to 40 parts by weight of the emulsion region relative to 100 parts by weight of the matrix. The proportion of the emulsion region may be at least 10 parts by weight or at least 15 parts by weight with respect to 100 parts by weight of the matrix. The ratio of the emulsion region may be 35 parts by weight or less with respect to 100 parts by weight of the matrix. In the above, the ratio of the weight of the matrix and the emulsion region is the ratio of the weight of each region itself, or the sum of the weights of all the components included in the region or the ratio of the main components or the weight of the material used to form the respective regions. It can mean a ratio. For example, the matrix and the emulsion region may each include polymerized units of hydrophilic and hydrophobic polymerizable compounds, and the weight ratio may be a ratio between the polymerized units.

The wavelength converting particles may be included in the matrix or emulsion region. In one example, the wavelength conversion particles may be included only in one of the matrix and emulsion regions, and may not be substantially included in the other regions. In the present application, the fact that the wavelength conversion particles are not substantially included in any region means, for example, the weight ratio of the wavelength conversion particles included in the corresponding region based on the total weight of the wavelength conversion particles included in the wavelength conversion layer. Is less than 10%, 9% or less, 8% or less, 7% or less, 6% or less, 5% or less, 4% or less, 3% or less, 2% or less, 1% or less, 0.5% or less, or 0.1% or less Can mean.

In one example, the wavelength conversion particles may be included in the emulsion region substantially among the matrix and emulsion regions. In this case, the matrix may be substantially free of wavelength converting particles. Therefore, in the above case, the ratio of the wavelength conversion particles contained in the emulsion region is 90% by weight, 91% by weight, 92% by weight, based on the total weight of the wavelength conversion particles contained in the wavelength conversion layer. At least 93 wt%, at least 94 wt%, at least 95 wt%, at least 96 wt%, at least 97 wt%, at least 98 wt%, at least 99 wt%, at least 99.5 wt% or at least 99.9 wt%.

Any one of the matrix and emulsion regions may comprise a hydrophilic polymer and the other region may comprise a hydrophobic polymer. As described above, the hydrophilic polymer refers to a polymer having a Hansen solubility parameter (HSP) of 10 (cal / cm ³ ) ^1/2 or more, and the hydrophobic polymer refers to a polymer having an HSP of less than 10 (cal / cm ³ ) ^1/2 . Can mean. In another example, the solubility parameter of the hydrophobic polymer may be 3 (cal / cm ³ ) ^1/2 or more, 4 (cal / cm ³ ) ^1/2 or more, or about 5 (cal / cm ³ ) ^{1/2 or} more. The solubility parameter of the hydrophilic polymer is, in another example, about 11 (cal / cm ³ ) ^1/2 or more, 12 (cal / cm ³ ) ^1/2 or more, 13 (cal / cm ³ ) ^1/2 or more, 14 (cal / cm ³ ) ^1/2 or more or 15 (cal / cm ³ ) ^{1/2 or} more. In another example, the solubility parameter of the hydrophilic polymer may be about 40 (cal / cm ³ ) ^1/2 or less, about 35 (cal / cm ³ ) ^1/2 or less, or about 30 (cal / cm ³ ) ^1/2 or less. . Differences in the solubility parameters of the hydrophobic and hydrophilic polymers can be controlled to implement an appropriate phase separation structure or emulsion structure. In one example, the difference between the solubility parameters of the hydrophilic and hydrophobic polymer is 5 (cal / cm ³ ) ^1/2 or more, 6 (cal / cm ³ ) ^1/2 or more, 7 (cal / cm ³ ) ^1/2 or more Or about 8 (cal / cm ³ ) ^{1/2 or} more. The difference is the value of the solubility parameter minus the small value. The upper limit of the difference is not particularly limited. The greater the difference in solubility parameters, the more suitable phase separation or emulsion structures can be formed. The upper limit of the difference may be, for example, 30 (cal / cm ³ ) ^1/2 or less, 25 (cal / cm ³ ) ^1/2 or less, or about 20 (cal / cm ³ ) ^1/2 or less. In one example, the matrix may comprise a hydrophilic polymer, and the emulsion region may comprise a hydrophobic polymer.

The first region or matrix may be formed by polymerizing a hydrophilic radical polymerizable compound. For example, the first region or matrix may be a compound of Formulas 1 to 4; Nitrogen-containing radically polymerizable compounds; And (meth) acrylic acid or a salt site thereof; It may include any one of the polymerization units selected from. The term "polymerization unit of a predetermined compound" in the present application may mean a state in which the predetermined compound is polymerized in a skeleton such as a main chain or a side chain of a polymer formed by polymerization of the predetermined compound.

[Formula 1]

[Formula 2]

[Formula 3]

[Formula 4]

In Formulas 1 to 4, Q ₁ is each independently hydrogen or an alkyl group,

U ₁ is each independently an alkylene group, A is each independently an alkylene group which may be substituted with a hydroxy group, Z is hydrogen, an alkoxy group, an epoxy group or a monovalent hydrocarbon group, X ₁ is a hydroxy group or a cyano group, m And n can be any number, for example a positive integer.

In the present application, the term "alkyl group" may mean an alkyl group having 1 to 20 carbon atoms, 1 to 16 carbon atoms, 1 to 12 carbon atoms, 1 to 8 carbon atoms, or 1 to 4 carbon atoms, unless otherwise specified. The alkyl group may be linear, branched or cyclic. In addition, the alkyl group may be optionally substituted with one or more substituents.

In the present application, the term "alkylene group" may mean an alkylene group having 1 to 20 carbon atoms, 1 to 16 carbon atoms, 1 to 12 carbon atoms, 1 to 8 carbon atoms, or 1 to 4 carbon atoms, unless otherwise specified. The alkylene group may be linear, branched or cyclic. In addition, the alkylene group may be optionally substituted with one or more substituents.

In the present application, the term "epoxy group", unless otherwise specified, may mean a cyclic ether having three ring constituent atoms or a compound containing the cyclic ether or a monovalent moiety derived therefrom. have. Examples of the epoxy group include glycidyl group, epoxyalkyl group, glycidoxyalkyl group or alicyclic epoxy group. In the above, the alicyclic epoxy group may mean a monovalent moiety derived from a compound containing an aliphatic hydrocarbon ring structure, wherein the two carbon atoms forming the aliphatic hydrocarbon ring also include an epoxy group. As the alicyclic epoxy group, an alicyclic epoxy group having 6 to 12 carbon atoms can be exemplified, for example, a 3,4-epoxycyclohexylethyl group or the like can be exemplified.

In the present application, the term "alkoxy group" may mean an alkoxy group having 1 to 20 carbon atoms, 1 to 16 carbon atoms, 1 to 12 carbon atoms, 1 to 8 carbon atoms, or 1 to 4 carbon atoms, unless otherwise specified. The alkoxy group may be linear, branched or cyclic. In addition, the alkoxy group may be optionally substituted with one or more substituents.

The term "monovalent hydrocarbon group" in the present application may refer to a compound consisting of carbon and hydrogen or a monovalent moiety derived from a derivative of such a compound, unless otherwise specified. For example, the monovalent hydrocarbon group may contain 1 to 25 carbon atoms. As a monovalent hydrocarbon group, an alkyl group, an alkenyl group, an alkynyl group, an aryl group, etc. can be illustrated.

In the present application, the substituent which may be optionally substituted with the alkyl group, alkoxy group, alkylene group, epoxy group or monovalent hydrocarbon group, includes a hydroxy group; Halogen such as chlorine or fluorine; Epoxy groups such as glycidyl groups, epoxyalkyl groups, glycidoxyalkyl groups or alicyclic epoxy groups; Acryloyl group; Methacryloyl group; Isocyanate group; Thiol group; Aryloxy group; Or a monovalent hydrocarbon group may be exemplified, but is not limited thereto.

In Formulas 1, 2, and 4, m and n may be any numbers, and for example, may be independently 1 to 20, 1 to 16, or 1 to 12, respectively.

As said nitrogen-containing radically polymerizable compound, for example, an amide group-containing radically polymerizable compound, an amino group-containing radically polymerizable compound, an imide group-containing radically polymerizable compound, or a cyano group-containing radically polymerizable compound Etc. can be used. As said amide group-containing radically polymerizable compound, it is (meth) acrylamide or N, N-dimethyl (meth) acrylamide, N, N-diethyl (meth) acrylamide, N-isopropyl (meth), for example. Acrylamide, N-methylol (meth) acrylamide, diacetone (meth) acrylamide, N-vinylacetoamide, N, N'-methylenebis (meth) acrylamide, N, N-dimethylaminopropyl (meth) ) Acrylamide, N-vinylpyrrolidone, N-vinylcaprolactam or (meth) acryloyl morpholine and the like can be exemplified, and examples of the amino group-containing radically polymerizable compound include aminoethyl (meth) acrylate, N, N-dimethylaminoethyl (meth) acrylate, N, N-dimethylaminopropyl (meth) acrylate, etc. can be illustrated, As an imide group containing radically polymerizable compound, N-isopropyl maleimide, N-cyclo Hexylmaleimide or itacone The like can be illustrated, and a cyano group-containing radical polymerizable, but as the compound, can be a nitrile such as acrylonitrile or methacrylonitrile, exemplified by acrylonitrile, but is not limited thereto.

Examples of salts of (meth) acrylic acid include, for example, salts with alkali metals including lithium, sodium, and potassium or salts with alkaline earth metals including magnesium, calcium, strontium, and barium. May be, but is not limited to such.

The first region and the matrix can be formed by polymerizing a hydrophilic polymerizable composition containing, for example, a hydrophilic radical polymerizable compound and a radical initiator. Thus, the first region and matrix may be a polymer of the hydrophilic polymerizable composition.

The kind of radical initiator contained in a hydrophilic polymerizable composition is not specifically limited. As an initiator, the radical thermal initiator or the photoinitiator which can start a polymerization reaction by application of heat or irradiation of light can be used.

As the thermal initiator, for example, 2,2-azobis-2,4-dimethylvaleronitrile (V-65, Wako), 2,2-azobisisobutyronitrile (V-60, Azo initiators such as Wako (manufactured) or 2,2-azobis-2-methylbutyronitrile (V-59, made by Wako); Dipropyl peroxydicarbonate (Peroyl NPP, NOF (manufactured)), Diisopropyl peroxy dicarbonate (Peroyl IPP, NOF (manufactured)), Bis-4-butylcyclohexyl peroxy dicarbonate (Peroyl TCP, NOF (manufactured) )), Diethoxyethyl peroxy dicarbonate (Peroyl EEP, NOF (product)), diethoxyhexyl peroxy dicarbonate (Peroyl OPP, NOF agent), hexyl peroxy dicarbonate (Perhexyl ND, NOF agent) ), Dimethoxybutyl peroxy dicarbonate (Peroyl MBP, NOF (product)), bis (3-methoxy-3-methoxybutyl) peroxy dicarbonate (Peroyl SOP, NOF agent), hexyl peroxy pival Rate (Perhexyl PV, NOF), amyl peroxy pivalate (Luperox 546M75, Atofina), butyl peroxy pivalate (Perbutyl, NOF) or trimethylhexanoyl peroxide (Peroyl 355, NOF) Peroxy ester compounds such as (agent); Dimethyl hydroxybutyl peroxane neodecanoate (Luperox 610M75, Atofina), amyl peroxy neodecanoate (Luperox 546M75, Atofina) or butyl peroxy neodecanoate (Luperox 10M75, Atofina) Peroxy dicarbonate compounds such as; Acyl peroxides such as 3,5,5-trimethylhexanoyl peroxide, lauryl peroxide or dibenzoyl peroxide; Ketone peroxide; Dialkyl peroxides; Peroxy ketal; Alternatively, one or more kinds of peroxide initiators such as hydroperoxide and the like may be used. As the photoinitiator, a benzoin-based, hydroxy-ketone-based, amino-ketone-based or phosphine oxide-based photoinitiator may be used. Benzoin, benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether, benzoin n-butyl ether, benzoin isobutyl ether, acetophenone, dimethylanino acetophenone, 2,2-dimethoxy- 2-phenylacetophenone, 2,2-diethoxy-2-phenylacetophenone, 2-hydroxy-2-methyl-1-phenylpropane-1one, 1-hydroxycyclohexylphenylketone, 2-methyl-1 -[4- (methylthio) phenyl] -2-morpholino-propan-1-one, 4- (2-hydroxyethoxy) phenyl-2- (hydroxy-2-propyl) ketone, benzophenone, p -Phenylbenzophenone, 4,4'-diethylaminobenzophenone, dichlorobenzophenone, 2-methylanthraquinone, 2-ethylanthraquinone, 2-t-butylanthraquinone , 2-aminoanthraquinone, 2-methyl thioxanthone, 2-ethyl thioxanthone, 2-chloro thioxanthone, 2,4-dimethyl thioxanthone, 2,4-diethyl thioxanthone, benzyl dimethyl ketal, aceto Phenone dimethylketal, p-dimethylamino benzoic acid ester, oligo [2-hydroxy-2-methyl-1- [4- (1-methylvinyl) phenyl] propanone] and 2,4,6-trimethylbenzoyl-diphenyl Phosphine oxide or the like may be used, but is not limited thereto.

The initiator may be selected to use a high solubility in the hydrophilic component, for example, a hydroxy ketone compound, a water dispersion hydroxy ketone compound, an amino ketone compound or a water dispersion amino ketone compound may be used, but is limited thereto. It doesn't happen.

The radical initiator may be included in the hydrophilic polymerizable composition, for example, in the range of 0.1 to 10 parts by weight based on 100 parts by weight of the hydrophilic polymerizable composition forming the wavelength conversion layer. Such a ratio can be changed in consideration of, for example, physical properties of the film, polymerization efficiency and the like.

For example, in consideration of filming properties, if necessary, the hydrophilic polymerizable composition may further include a crosslinking agent. As a crosslinking agent, the compound which has two or more radically polymerizable groups can be used, for example.

As a compound which can be used as a crosslinking agent, polyfunctional acrylate can be illustrated. The multifunctional acrylate may mean a compound including two or more acryloyl groups or methacryloyl groups.

Examples of the polyfunctional acrylate include 1,4-butanediol di (meth) acrylate, 1,6-hexanediol di (meth) acrylate, neopentyl glycol di (meth) acrylate, and polyethylene glycol di ( Meta) acrylate, neopentylglycol adipate di (meth) acrylate, hydroxyl puivalic acid neopentylglycol di (meth) acrylate, dicyclopentanyl di (meth) Acrylate, caprolactone modified dicyclopentenyl di (meth) acrylate, ethylene oxide modified di (meth) acrylate, di (meth) acryloxy ethyl isocyanurate, allylated cyclohexyl di (meth) ) Acrylate, tricyclodecane dimethanol (meth) acrylate, dimethylol dicyclopentane di (meth) acrylate, ethylene oxide modified hexahydrophthalic acid di (meth) acrylate, tricyclo Candimethanol (meth) acrylate, neopentylglycol modified trimethylpropane di (meth) acrylate, adamantane di (meth) acrylate or 9,9-bis [4- (2-acryloyloxy Difunctional acrylates such as ethoxy) phenyl] fluorene and the like; Trimethylolpropane tri (meth) acrylate, dipentaerythritol tri (meth) acrylate, propionic acid modified dipentaerythritol tri (meth) acrylate, pentaerythritol tri (meth) acrylate, propylene oxide Trifunctional acrylates such as modified trimethylolpropane tri (meth) acrylate, trifunctional urethane (meth) acrylate or tris (meth) acryloxyethyl isocyanurate; Tetrafunctional acrylates such as diglycerin tetra (meth) acrylate or pentaerythritol tetra (meth) acrylate; 5-functional acrylates, such as propionic acid modified dipentaerythritol penta (meth) acrylate; And dipentaerythritol hexa (meth) acrylate, caprolactone modified dipentaerythritol hexa (meth) acrylate or urethane (meth) acrylate (ex. Isocyanate monomers and trimethylolpropane tri (meth) acrylate 6-functional acrylates, such as a reactant, etc. Moreover, as a polyfunctional acrylate, it is a compound called what is called photocurable oligomer in the industry, urethane acrylate, epoxy acrylate, polyester acrylate, or polyether. Acrylate etc. can also be used An appropriate kind can be selected from the above-mentioned compounds, and can be used, selecting one or more types.

As the crosslinking agent, a component capable of implementing a crosslinking structure by a radical reaction such as the polyfunctional acrylate, as well as, if necessary, crosslinking by a thermosetting reaction such as a known isocyanate crosslinking agent, epoxy crosslinking agent, aziridine crosslinking agent or metal chelate crosslinking agent Components that can implement the structure can also be used.

The crosslinking agent may be included in the hydrophilic polymerizable composition, for example, in the range of 10 parts by weight to 50 parts by weight based on 100 parts by weight of the hydrophilic polymerizable composition. The ratio of the crosslinking agent may be changed in consideration of, for example, physical properties of the film.

The hydrophilic polymerizable composition may further include other necessary components in addition to the components described above.

The second region or the emulsion region may also be formed by polymerizing a radically polymerizable compound, and for example, may be formed by polymerizing a hydrophobic radically polymerizable compound. The radically polymerizable compound capable of forming the second region or the emulsion region is not particularly limited, and for example, the second region or the emulsion region may be a compound represented by any of the formulas selected from the following Chemical Formulas 5 to 7. And polymerized units.

[Formula 5]

[Formula 6]

[Formula 7]

In Chemical Formulas 5 to 7, each Q ₂ is independently hydrogen or an alkyl group, each U ₂ is independently an alkylene group, an alkenylene group, an alkynylene group or an arylene group, and B is a straight or branched chain alkyl group having 5 or more carbon atoms or an alicyclic group. It is a formula hydrocarbon group, Y is an oxygen atom or a sulfur atom, X <_2> is an oxygen atom, a sulfur atom, or an alkylene group, Ar is an aryl group, n is an arbitrary number, for example, a positive integer.

In the present application, the term "alkenylene group or alkynylene group" means an alkenylene group having 2 to 20 carbon atoms, 2 to 16 carbon atoms, 2 to 12 carbon atoms, 2 to 8 carbon atoms, or 2 to 4 carbon atoms, unless otherwise specified. Or an alkynylene group. The alkenylene group or alkynylene group may be linear, branched or cyclic. In addition, the alkenylene group or alkynylene group may be optionally substituted with one or more substituents.

The term "arylene group" in the present application may refer to a divalent moiety derived from a compound or a derivative thereof including a structure in which benzene or two or more benzenes are condensed or bonded, unless otherwise specified. The arylene group may have a structure containing, for example, benzene, naphthalene or fluorene.

The term "aryl group" in the present application may refer to a monovalent moiety derived from a compound or a derivative thereof including a structure in which a benzene ring or a structure in which two or more benzene rings are condensed or bonded, unless otherwise specified. The aryl group may be, for example, an aryl group having 6 to 25 carbon atoms, 6 to 21 carbon atoms, 6 to 18 carbon atoms, or 6 to 12 carbon atoms.

Substituents which may be optionally substituted in the alkynylene group, arylene group or aryl group in the present application, a hydroxy group; Halogen such as chlorine or fluorine; Epoxy groups such as glycidyl groups, epoxyalkyl groups, glycidoxyalkyl groups or alicyclic epoxy groups; Acryloyl group; Methacryloyl group; Isocyanate group; Thiol group; Aryloxy group; Or a monovalent hydrocarbon group may be exemplified, but is not limited thereto.

In one example, Q ₂ of Formula 5 may be hydrogen or an alkyl group, and B may be a straight or branched chain alkyl group or alicyclic hydrocarbon group having 5 or more carbon atoms.

Specifically, in Formula 5, B may be a straight chain or branched alkyl group having 5 or more carbon atoms, 7 or more carbon atoms, or 9 or more carbon atoms. As such, a compound containing a relatively long chain alkyl group is known as a relatively nonpolar compound. The upper limit of the carbon number of the linear or branched alkyl group is not particularly limited. For example, the alkyl group may be an alkyl group having 20 or less carbon atoms.

In another embodiment, B may be, in another example, an alicyclic hydrocarbon group, for example, an alicyclic hydrocarbon group having 3 to 20 carbon atoms, 3 to 16 carbon atoms, or 6 to 12 carbon atoms, and examples of such hydrocarbon group include cyclohexyl group or iso Bornyl group and the like can be exemplified. Thus, the compound which has alicyclic hydrocarbon group is known as a relatively nonpolar compound.

In one example, Q ₂ of Formula 6 may be hydrogen or an alkyl group, and U ₂ may be an alkenylene group, an alkynylene group, or an arylene group.

In one example, in Formula 7, Q ₂ is hydrogen or an alkyl group, U ₂ is an alkylene group, Y is a carbon atom, an oxygen atom or a sulfur atom, X ₂ is an oxygen atom, a sulfur atom or an alkylene group, and Ar is Is an aryl group, n can be any number, for example, a positive integer in the range of 1-20, 1-16, or 1-12.

The second region or the emulsion region can be formed by polymerizing a hydrophobic polymerizable composition containing, for example, a hydrophobic radical polymerizable compound and a radical initiator. Thus, the second region or emulsion region may be a polymer of the hydrophobic polymerizable composition.

The kind of hydrophobic radically polymerizable compound contained in the hydrophobic polymerizable composition is not particularly limited, and a compound known in the art as a so-called nonpolar monomer can be used. For example, the compound described above may be used as the compound.

The kind of radical initiator contained in a hydrophobic polymerizable composition is not specifically limited. For example, an appropriate kind can be selected and used from the initiator described in the item of the hydrophilic polymeric compound mentioned above.

For example, the radical initiator may be included in the hydrophobic polymerizable composition at 5 parts by weight or less based on 100 parts by weight of the hydrophobic polymerizable composition. Such weight ratio may be changed in consideration of, for example, physical properties and polymerization efficiency of the film.

In consideration of filming properties, if necessary, the hydrophobic polymerizable composition may further include a crosslinking agent. As the crosslinking agent, without particular limitation, for example, an appropriate component may be selected and used from the components described in the hydrophilic polymerizable composition section.

The crosslinking agent may be included in the hydrophobic polymerizable composition, for example, in a range of 50 parts by weight or less or 10 parts by weight to 50 parts by weight with respect to 100 parts by weight of the hydrophobic polymerizable composition. The weight ratio of the crosslinking agent may be changed in consideration of, for example, the physical properties of the film, the influence of other components included in the polymerizable compound, and the like. The hydrophobic polymerizable composition may further include other components if necessary.

The wavelength conversion particle may be included in the wavelength conversion layer, and may be included in, for example, the first or second region. In one example, the wavelength conversion particle may be included only in the second region and may not exist in the first region. As described above, the region in which the wavelength conversion particle does not exist may mean a region that does not substantially include the wavelength conversion particle.

The ratio in the wavelength conversion layer of the wavelength conversion particles is not particularly limited, and may be selected in an appropriate range in consideration of desired optical properties and the like. In one example, the wavelength conversion particles in the wavelength conversion layer may be included in the wavelength conversion layer in the range of 0.05 wt% to 20 wt% based on the total weight of the first and second regions or the total solid content of the wavelength conversion layer. However, it is not limited thereto.

In one example, the wavelength conversion layer may include the above-described green particles and / or red particles in a clustered state with respective regions formed in the second region or the emulsion region.

That is, the second region or the emulsion region of the present application is the A region and / or 420nm to 490nm including the first wavelength conversion particles capable of absorbing light in the range of 420nm to 490nm to emit light in the range of 490nm to 580nm It may include a region B including the second wavelength conversion particles capable of absorbing light in the range to emit light in the range of 580nm to 780nm. The first wavelength converting particle may mean the green particle described above, and the second wavelength converting particle may mean the red particle described above.

Specifically, the second region or the A region of the emulsion region of the present application may include the first wavelength converting particles and may not substantially include the second wavelength converting particles. Substantially not including the second wavelength converting particles may mean, for example, a state in which the second wavelength converting particles are included in a ratio of 10% by weight or less to the total wavelength converting particles present in the A region. . Similarly, the second region or the region B of the emulsion region may include the second wavelength converting particles and may not substantially include the first wavelength converting particles.

In one example, the first mixture is prepared by mixing the green particles and other additives with a hydrophilic polymerizable compound and a hydrophobic polymerizable compound to obtain a wavelength converting layer having a second or emulsion region comprising A and B regions. In addition, the red particles and other additives may be mixed with a hydrophilic polymerizable compound and a hydrophobic polymerizable compound to prepare a second mixture, and then the method of mixing the first mixture and the second mixture may be used. no.

The wavelength conversion layer may include other components in addition to the aforementioned components. Examples of other components that may be included in the wavelength conversion layer may include, but are not limited to, amphiphilic nanoparticles and scattering particles described below.

The wavelength conversion layer may further include additives such as an oxygen scavenger, a radical scavenger, an antioxidant, or the like in the required amount, in addition to the aforementioned components.

The thickness of the wavelength conversion layer is not particularly limited and may be selected in an appropriate range in consideration of the intended use and optical characteristics. In one example, the wavelength conversion layer may have a thickness in the range of 10 μm to 500 μm, but is not limited thereto.

The manner of forming the wavelength conversion layer is not particularly limited. For example, the obtained mixture can be formed by coating onto a suitable substrate by a known coating method. The method of curing the layer formed in the above manner is not particularly limited, for example, applying an appropriate range of heat to activate the initiator contained in each composition, or applying electromagnetic waves such as ultraviolet rays. This can be done in a way.

The optical film of the present application includes a barrier film existing on both sides of the wavelength conversion layer described above.

In the present application, the term "barrier film is present on both sides of the wavelength conversion layer" means that the wavelength conversion layer is in direct contact with the barrier film or through another layer, for example, a substrate layer or a reflective layer described later. It can be understood to include the case where a barrier film is formed on both sides of the layer.

The optical film according to the present application may effectively overcome the problem of deterioration of durability by arranging the optical film adjacent to the light source part by including a barrier film having excellent blocking properties against moisture, oxygen, and the like on both surfaces of the wavelength conversion layer.

In one example, the barrier film may include a moisture barrier layer having a water vapor permeability (WVTR) of 10 ⁻¹ g / m ² / day or less. The water vapor transmission rate (WVTR) may be, for example, a value measured at a temperature of 38 ° C. and a relative humidity of 90% by the ASTM F 1249 method. The water vapor permeability means that the lower the value, the moisture barrier layer shows an excellent barrier against moisture or moisture, the lower limit is not particularly limited.

In detail, the moisture barrier layer may have a glass transition temperature of 60 ° C. or higher. Within such a glass transition temperature range, the barrier film may exhibit excellent durability at high temperature conditions. The glass transition temperature, in another example may be 65 ℃ or more or 70 ℃ or more. In another example, the glass transition temperature may be 300 ° C. or less, 250 ° C. or less, 200 ° C. or less, 150 ° C. or less, or 100 ° C. or less. Such glass transition temperature can be achieved by selecting a material having a high glass transition temperature as a material for forming the moisture barrier layer, or if necessary, through an appropriate crosslinking or stretching process.

The moisture barrier layer may, for example, have a coefficient of thermal expansion (CTE) in the range of about 5 ppm / ° C to 70 ppm / ° C. Such ranges include, for example, when the barrier film further includes an oxygen barrier layer, for example, a problem due to stability and interlayer peeling in the process of laminating the oxygen barrier layer through an adhesive layer or the like with a moisture barrier layer or the like. Can be prevented.

In one example, the moisture barrier layer can have a refractive index of at least about 1.5, at least about 1.6, at least about 1.7, at least about 1.75 or at least about 1.8.

The term refractive index in this application, unless otherwise specified, is a refractive index measured at light of about 550 nm wavelength. When the moisture barrier layer has the refractive index range, it may be advantageous to increase the light efficiency when the barrier film including the moisture barrier layer is applied to the optical film. The upper limit of the refractive index of the moisture barrier layer is not particularly limited, and may be, for example, about 2.0. The refractive index of the moisture barrier layer may be achieved by preparing the moisture barrier layer through a resin having a refractive index in the above range, or by appropriately blending a component having the refractive index range in the film in the process of preparing the moisture barrier layer. .

The moisture barrier layer may be, for example, a polymer film or sheet, a polymer coating layer or a deposition layer.

As used herein, the term "polymer coating layer" may mean a coating layer including a polymer and / or a curable monomer capable of UV curing or thermosetting.

For example, the moisture barrier layer may be polyester such as polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polybutylene terephthalate (PBT) or polycyclohexanedimethanol terephthalate (PCT); Polyolefins such as polyethylene, polypropylene or polybutene; Polyamides such as nylon 6 or nylon 12; Vinyl alcohol resins such as polyvinyl alcohol and ethylene-vinyl alcohol copolymers; Perfluoro Alkoxy Resin (PFA), Tetrafluoroethylene-6 Hexafluoropropylene Propylene (FEP), Perfluoro Ethylene-Perfluoro Propylene-Perfluoro Vinyl Ether Terpolymer (EPE), Ethylene-4 Fluorine Ethylene Fluorine resins such as copolymer (ETFE), chloride trifluoride ethylene resin (PCTFE), polyvinylidene fluoride (PVDF) or polyvinyl fluoride (PVF); Polycarbonate resins; Triacetyl cellulose; Cyclo olefins; Or a resin selected from polyacrylonitrile, acrylic resin, methacryl resin or polyglycolic acid resin, or the like, or a film, sheet or coating layer containing a polymer such as polyimide or polyarylate.

In one example, the moisture barrier layer may be a single layer or a multilayer film or sheet formed from one or a mixture of two or more of the above materials, or may be a coating layer.

In another example, when the moisture barrier layer is a deposition layer, the moisture barrier layer is, for example, In, Sn, Pb, Au, Cu, Ag, Zr, Hf, Zn. Metals such as Al, Si, La, Ti, or Ni, oxides of the metals, nitrides of the metals, oxynitrides of the metals, or acid fluorides of the metals.

The moisture barrier layer can be, for example, an elongated stretched layer or an unstretched non-stretched layer.

The moisture barrier layer may have an appropriate thickness range in consideration of thinning, strength, and transparency, for example, 0.1 μm to 100 μm or 1 μm to 90 μm, 10 μm to 80 μm, or 20 μm to 70 μm. It may have a thickness range, but is not limited thereto.

The moisture barrier layer may also be a layer having optical anisotropy. In the case of having optical anisotropy, the birefringence (Δn, reference wavelength: 550 nm) of the moisture barrier layer may be adjusted in consideration of application to optical applications. In addition, the moisture barrier layer having optical anisotropy has a planar phase difference (Rin = d (nx-ny), where d is the thickness of the moisture barrier layer, nx is the slow axis refractive index of the moisture barrier layer, and ny is the moisture barrier layer). Refractive index in the fast axis direction) (reference wavelength: 550 nm) may be in a predetermined range. For example, the range of the planar phase difference (Δn, reference wavelength: 550 nm) can be adjusted in consideration of application to optical applications.

The barrier film may be a single layer structure consisting of the moisture barrier layer or a multilayer structure including an additional functional layer.

In one example, the barrier film may further include an oxygen barrier layer formed on one or both sides of the moisture barrier layer.

In the present application, the term "oxygen barrier layer" refers to a layer having oxygen barrier properties. For example, the oxygen transmittance (OTR) measured at 23 ° C. and 0% relative humidity condition by ASTM D 3985 method is used. About 1 cc / m ² / day / atm or less, 0.9 cc / m ² / day / atm or less, 0.8 cc / m ² / day / atm or less, 0.7 cc / m ² / day / atm or less, 0.6 cc / m ² / day / atm or less, 0.5 cc / m ² / day / atm or less, 0.4 cc / m ² / day / atm or less, 0.3 cc / m ² / day / atm or less, 0.2 cc / m ² / day / atm or less It may mean a layer that is about 0.1 cc / m ² / day / atm or less. The lower the oxygen transmission rate, the lower the value means that the oxygen barrier layer exhibits excellent blocking ability, and therefore the lower limit thereof is not particularly limited.

The oxygen barrier layer can be formed using a material known to have an oxygen barrier capability, for example, a polymer. The oxygen barrier layer may be formed using a film or a sheet formed using the polymer, or through a coating layer formed by coating the polymer.

Such polymers include polyvinyl alcohol, nylon, polyvinyl chloride, polyvinyl fluoride, polyvinylidene chloride, polyacrylonitrile, ethylene vinyl alcohol copolymers, polycarboxylic acids, polyethyleneimines, ethylene vinyl acetate copolymers, and the like. This may be illustrated but is not limited thereto.

In one example, the oxygen barrier layer may comprise a water soluble or water swellable polymer. As the water-soluble or water-swellable polymer, polyvinyl alcohol, ethylene vinyl alcohol copolymer, polycarboxylic acid or polyethyleneimine may be exemplified.

For example, the oxygen barrier layer may include polyvinyl alcohol. In the present application, the term "polyvinyl alcohol" may include polyvinyl alcohol, copolymers thereof and modified substances thereof.

In one example, the polyvinyl alcohol may have an average degree of polymerization in the range of 200 to 3,500, 300 to 2,000 or 500 to 1,500.

The polyvinyl alcohol may have a degree of hydrolysis of at least 80%, at least 90%, at least 95%, or at least 98%.

The physical property of the polyvinyl alcohol may be, for example, a value measured based on KS M ISO 15023-2 (based on physical property measurement method of polyvinyl alcohol (PVOH) material). The polyvinyl alcohol resin may be prepared by a known method, for example, by hydrolysis of polyvinylacetate.

The oxygen barrier layer may have a glass transition temperature of 60 ° C. or higher. Within such a glass transition temperature range, the oxygen barrier layer and the barrier film including the same may exhibit excellent durability at high temperature conditions. The glass transition temperature, in another example may be 65 ℃ or more or 70 ℃ or more. In another example, the glass transition temperature may be 300 ° C. or less, 250 ° C. or less, 200 ° C. or less, 150 ° C. or less, or 100 ° C. or less. Such glass transition temperature can be achieved by selecting a material having a high glass transition temperature as a material for forming the oxygen barrier layer or, if necessary, through an appropriate crosslinking or stretching process.

For example, the oxygen barrier layer may include a polymer such as polyvinyl alcohol described above, and the polymer may be crosslinked. Crosslinking of a polymer can be performed using an appropriate crosslinking agent, for example. The crosslinking agent that can be used may be selected in consideration of the kind of the polymer forming the oxygen barrier layer, and the kind thereof is not particularly limited. Examples of the crosslinking agent include, but are not limited to, inorganic acids such as boric acid, polyhydric carboxylic acid compounds such as aldehyde compounds, siloxane compounds, succinic acid, and polyfunctional isocyanate compounds.

By appropriate crosslinking, the oxygen barrier ability of the oxygen barrier layer can be ensured, the glass transition temperature range described above can be ensured, and heat resistance can also be ensured.

The ratio of the crosslinking agent in the oxygen barrier layer may be adjusted to secure oxygen barrier properties and heat resistance. For example, the oxygen barrier layer may include 3 to 5 parts by weight of a crosslinking agent based on 100 parts by weight of the main polymer. Within this range, it is possible to secure an appropriate oxygen barrier property and glass transition temperature. In another example, the oxygen barrier layer may include 3.1 to 4.9, 3.2 to 4.8, 3.3 to 4.7, 3.5 to 4.6 or 3.6 to 4.5 parts by weight of the crosslinking agent based on 100 parts by weight of the polymer.

The oxygen barrier layer may have optical anisotropy, for example.

In the case of having optical anisotropy, the range of the birefringence (n, reference wavelength: 550 nm) can be adjusted in consideration of application to optical applications and the like. For example, the oxygen barrier layer may have a birefringence range of 0.01 or more, 0.015 or more, or 0.02 or more. The birefringence may be 0.2 or less, 0.15 or less, 0.1 or less, or 0.05 or less in another example.

The oxygen barrier layer having optical anisotropy has a planar phase difference (Rin = d (nx-ny), where d is the thickness of the oxygen barrier layer, nx is the slow axis refractive index of the oxygen barrier layer, and ny is the fast axis of the oxygen barrier layer. Direction of refraction) (reference wavelength: 550 nm) may be in a predetermined range. For example, the range of the retardation phase (Rin, reference wavelength: 550 nm) can be adjusted in consideration of application to optical applications. For example, the oxygen barrier layer may have a plane retardation of 100 nm or more, 150 nm or more, 165 nm or more, 200 nm or more, 700 nm or more, 750 nm or more, or 800 nm or more. In another example, the birefringence may be 1,500 nm or less, 1,400 nm or less, 1,300 nm or less, 1,200 nm or less, or 1,000 nm or less.

The oxygen barrier layer may be a stretched layer. For example, when the oxygen barrier layer is a film or sheet made of the above-described polymer or a coating layer, the stretched layer may be formed by stretching the film, sheet or coating layer in an appropriate range. The stretching layer may be a uniaxial stretching layer or a biaxial stretching layer or more multiaxial stretching layer. The following method of stretching is known, and for example, stretching can be performed at a predetermined magnification through a uniaxial or biaxial stretching machine.

In the case of the stretched layer, the draw ratio may be adjusted to an appropriate range in consideration of the glass transition temperature or the oxygen barrier property. For example, the draw ratio of the stretched layer may be in the range of 1 to 7 times. In another example, the draw ratio of the stretched layer may be in the range of 2 to 6 times or 3 to 5 times. Specifically, the draw ratio of the stretched layer may be selected within the above-described draw ratio range, and in a non-limiting example, 1 times, 1.5 times, 2 times, 2.5 times, 3 times, 3.5 times, 4 times, 4.5 times. The stretching layer can be stretched at a draw ratio of 5 times, 5.5 times, 6 times, 6.5 times, or 7 times. The stretched layer uniaxially or biaxially stretched at the above magnification may be applied as the oxygen barrier layer.

In another example, the stretched layer may be stretched so that a ratio of the thickness d after stretching and the thickness before stretching (d _o ) satisfies Equation 1 below.

[Equation 1]

d / d _o = β ^-α

In the formula 1, d is the thickness of the oxygen barrier layer after stretching, d _o is the thickness of the oxygen barrier layer before stretching, _β is a number in the range of 2 to 8 or 5 to 6, α is a number in the range of 0.5 to 1 Can be.

The oxygen barrier layer may be stretched before being laminated with the moisture barrier layer or other pressure-sensitive adhesive layer or adhesive layer, or may be integrally stretched after being laminated with the layers.

The oxygen barrier layer may perform a predetermined pretreatment process such as washing or swelling treatment before performing the stretching process. The washing or swelling process conditions may be selected in consideration of appropriate process conditions in consideration of the breakage of the oxygen barrier layer that may occur by securing the barrier properties for gas such as oxygen of the oxygen barrier layer and performing the stretching process. .

The thickness of the oxygen barrier layer may be set in an appropriate thickness range in consideration of securing a barrier characteristic to a gas such as oxygen, and concerns about generation of cracks due to warpage of the laminate. In one example, the oxygen barrier layer may have a thickness in the range of 0.1 μm to 100 μm. The thickness may be 0.5 μm or more, 1 μm or more, 2 μm or more, 3 μm or more, 4 μm or more, or 5 μm or more. In addition, the thickness is 95 μm or less, 90 μm or less, 85 μm or less, 80 μm or less, 75 μm or less, 70 μm or less, 65 μm or less, 60 μm or less, 55 μm or less, 50 μm or less, 45 μm or less, 40 It may be, but is not limited to, μm, 35 μm, 30 μm, 25 μm, 20 μm, 15 μm, or 10 μm.

The oxygen barrier layer may include various additives in addition to the aforementioned polymer and / or crosslinking agent.

In one example, the oxygen barrier layer may include moisture or an oxygen barrier material, scattering particles, or the like. The term "moisture or oxygen blocking material" may refer to a material that is included in the oxygen blocking layer to block water or oxygen through chemical or physical action. Examples of the moisture or oxygen blocking substance include inorganic fine particles such as activated alumina; Layered silicates (such as filosilicate minerals), kaolinite foot clay minerals (such as halosite, kaolinite, enderite, dickite or nacrite), anchigorite clay minerals (such as anchigorite or chrysotile), smectite clay minerals (such as Montmorillonite, baydelite, nontronite, saponite, hectorite or stebencite, etc. Layered inorganic compounds such as silicic mica or teniolite; Antioxidants, such as a hindered amine type, a phenol type, a thioester type, or a phosphite type organic substance, etc. can be illustrated, but it is not limited to this.

The layered inorganic compound may be used as an appropriate additive in terms of complementing the properties of the oxygen barrier layer. The layered inorganic compound may be uniformly dispersed in the oxygen barrier layer, and may have an aspect ratio, which may be advantageous in securing excellent gas barrier properties of the oxygen barrier layer.

The oxygen barrier layer may also include scattering particles. The scattering particles included in the oxygen barrier layer may serve to improve the optical properties of the wavelength conversion particles in the optical film when the barrier film is used in, for example, the optical film. The term scattering particles in the present application is any kind capable of scattering, refracting or diffusing incident light having a refractive index different from that of the polymer, which is the subject of the oxygen barrier layer described below, and having an appropriate size. It may mean a particle of. The scattering particles may, for example, have an average particle diameter of at least 100 nm, more than 100 nm, 100 nm to 20,000 nm, 100 nm to 15,000 nm, 100 nm to 10,000 nm, 100 nm to 5,000 nm, 100 nm to 1,000 nm or 100 nm to 500 nm. The scattering particles may have a shape such as spherical, elliptical, polyhedron or amorphous, but the shape is not particularly limited. The scattering particles include, for example, organic materials such as polystyrene or derivatives thereof, acrylic resins or derivatives thereof, silicone resins or derivatives thereof, or novolak resins or derivatives thereof, or inorganic materials such as titanium oxide or zirconium oxide. Particles may be exemplified. The scattering particles may be formed of only one of the above materials or two or more of the above materials. For example, hollow particles such as hollow silica or core / cell structure particles may be used as scattering particles.

The amount of the moisture or oxygen barrier material, or the scattering particles, in the oxygen barrier layer may be adjusted to an amount sufficient to achieve the purpose of addition of the respective substances without impairing the gas barrier properties of the oxygen barrier layer.

The oxygen barrier layer may include additives such as a heat stabilizer, an ultraviolet absorber, a plasticizer, an antistatic agent, a lubricant, an antiblocking agent, a colorant, or a leveling agent in addition to the additive.

If the barrier film comprises an oxygen barrier layer and a moisture barrier layer, an adhesive layer or an adhesive layer may be present between the two layers, for example.

That is, when the barrier film has a multilayer structure, the moisture barrier layer may be present on one surface of the oxygen barrier layer, and the adhesive layer or the adhesive layer may be present between the moisture barrier layer and the oxygen barrier layer. . When the barrier film includes an adhesive layer or an adhesive layer, the type of adhesive or adhesive that can be applied is not particularly limited, and a known material may be applied. Such adhesives or adhesives may be applied, for example, to attach a moisture barrier layer to an oxygen barrier layer or to attach an oxygen barrier layer to another layer. As an adhesive or adhesive that can be applied, an epoxy, acrylic, urethane, silicone, or olefin (ex. PIB (polyisobutylene series) adhesive layer or adhesive layer may be exemplified).

The pressure-sensitive adhesive layer or adhesive layer can be prepared by curing, for example, an aqueous, solvent-based or solvent-free pressure-sensitive adhesive or adhesive composition. In addition, the pressure-sensitive adhesive layer or adhesive layer may include a thermosetting type, room temperature curing type, moisture curing type or photocurable pressure sensitive adhesive or adhesive composition in a cured state.

Various known additives may be added to the barrier film, and in one example, plasticizers, salt pigments, antistatic agents, ultraviolet absorbers, antioxidants, inorganic fine particles, reviling agents, lubricants, and the like may be added.

If both the moisture barrier layer and the oxygen barrier layer are optically anisotropic, the slow axis of the oxygen barrier layer and the slow axis of the moisture barrier layer may be vertically or horizontally disposed in consideration of the applicability to optical applications. Vertical or horizontal defining an angle in the present application is substantially vertical or horizontal in consideration of manufacturing errors, for example, within about ± 10 degrees, within ± 9 degrees, within ± 8 degrees, within ± 7 degrees, ± 6 Errors within degrees, within ± 5 degrees, within ± 4 degrees, within ± 3 degrees, within ± 2 degrees, or within ± 1 degrees.

The oxygen barrier layer or the moisture barrier layer may be treated with chemical treatment, corona discharge treatment, mechanical treatment, ultraviolet (UV) treatment, active plasma treatment, or glow discharge treatment, if necessary, and may be anchor coating or hard coating. Coating treatment such as a coating layer may be performed to improve durability of the barrier film.

FIG. 7 shows a barrier film 202 in which an oxygen barrier layer 202b is formed on one side of the moisture barrier layer 202a. FIG. 8 is also a case where the oxygen barrier layer 202b is formed on one side of the moisture barrier layer 202a, and the oxygen barrier layer 202b is attached to the moisture barrier layer 202a via an adhesive or an adhesive layer 202c. The barrier film 202 is shown.

9 shows another exemplary barrier film 202, in which a moisture barrier layer 202a is attached to one side of the oxygen barrier layer 202b by an adhesive layer or an adhesive layer 202c, and on the other side as a polymer coating layer. The case where the coating layer 202d is formed is shown. "High hardness layer" is a kind of coating layer of a polymer, and may mean a layer having a pencil hardness of 1H or more or 2H or more under a load of 500 g. In the above, the pencil hardness can be measured according to the ASTM D 3363 standard, for example, using a pencil lead defined in KS G2603. The high hardness layer may be, for example, a high hardness resin layer. The resin layer may include, for example, a room temperature curing type, a moisture curing type, a thermosetting type, or an active energy ray curable resin composition in a cured state. In one example, the resin layer may include a thermosetting or active energy ray-curable resin composition, or an active energy ray-curable resin composition in a cured state. Also, the resin layer may be a room temperature curing type, a moisture curing type, a thermosetting type, or an active material. The energy radiation curable resin composition may refer to a composition in which the cured state is induced at room temperature or may be induced by application of heat or irradiation of active energy rays in the presence of appropriate moisture.

In one example, the resin composition may include an acrylic compound, an epoxy compound, a urethane compound, a phenol compound, a polyester compound, or the like as a main material. In the above, the "compound" may be a monomeric, oligomeric or polymeric compound.

As described above, the method of forming the barrier films stacked sequentially may include, for example, forming an adhesive layer on one side or both sides of the previously prepared moisture barrier layer, and then laminating the oxygen barrier layer through the adhesive layer. Can be used.

In another example, a barrier film including an oxygen barrier layer, an adhesive layer or an adhesive layer, and a moisture barrier layer is sequentially formed by co-extrusion of a resin material capable of forming each layer using a known extrusion die. It may be formed.

The transmittance of the barrier film can be adjusted for application in optical applications. For example, the barrier film may have a transmittance of at least one of wavelengths in a visible light region, for example, a wavelength in a range of 420 nm to 680 nm, or a transmittance of at least 80%, at least 85% of all light within the range, At least 90% or at least 95%. The transmittance means a point having excellent transparency and the like as the range is higher, and its upper limit is not particularly limited.

The transmission of the barrier film can be adjusted to be uniform for optical applications, in particular for suitable application to display devices. For example, the barrier film has a ratio (A / B) of transmittance (A) to light in a range of 420 nm to 490 nm and light transmission (B) to light in a range of 500 nm to 580 nm. The ratio (B / C) of the transmittance (B) to light in the range of 500 nm to 580 nm and the transmittance (C) to light in the range of 590 nm to 780 nm may be in the range of 1 to 1.5. In another example, the barrier film may have a ratio (A / B) of transmittance (A) to light in a wavelength in a range of 420 nm to 490 nm and a transmittance (B) to light in a range of 500 nm to 580 nm (A / B). The ratio (B / C) of transmittance (B) to light in the range of 1.2 to 1.3 and light in the range of 500 nm to 580 nm (B / C) for light in the range of 590 nm to 780 nm is 1.1 to 1.4 or 1.2 to 1.3. It may be in the range of. The barrier film having such a transmittance characteristic can be applied to a display device or the like to exhibit an excellent effect without generating color stains or the like.

The barrier film may also have a haze in the range of 15% to 96%. In other examples the barrier film may have a haze in the range of 20% to 90%, 30% to 80%, 40% to 80% or 50% to 70%. Haze within this range can be made to exhibit suitable luminescence properties, for example, when a barrier film is included in an optical film.

The optical member of the present application includes a barrier film having a single layer or a multilayer structure that satisfies the above-described physical properties, thereby effectively overcoming a durability problem that may occur when disposed between the light source unit and the light guide plate.

The optical film according to the present application may further include a reflective layer existing on one side or both sides of the wavelength conversion layer.

In the present application, the term "reflective layer" means a layer having reflection characteristics with respect to light having a predetermined wavelength among the light passing through the wavelength conversion layer.

In one example, the reflective layer may be a cholesteric liquid crystal layer in which the central wavelength λ _o of the reflected light, which is determined according to Equation 2 below, is within a range of 420 nm to 510 nm or 490 nm to 780 mm.

[Formula 2]

λ _o = n × p × cosθ

Λ _o in Equation 2 is the central wavelength of the reflected light of the cholesteric liquid crystal layer, n is the average refractive index of the cholesteric liquid crystal layer, p is the pitch of the cholesteric liquid crystal layer, θ is the cholesteric liquid crystal The incident angle (unit: degree) of light incident on the cholesteric liquid crystal layer measured based on the normal of the layer surface.

It is known that a suitably oriented cholesteric liquid crystal layer (hereinafter "CLC" layer) can selectively reflect circularly polarized light. In addition, the wavelength of the light reflected by the CLC layer depends on the refractive index and the pitch of the liquid crystal. The CLC layer according to the present application adjusts the refractive index and the pitch of the liquid crystal so that the center wavelength of the reflected light is controlled, for example, in the range of 420 nm to 510 nm. By adjusting to an internal wavelength or a wavelength within the range of 490 nm to 780 mm, it is possible to prevent a blur phenomenon of color coordinates, and to provide an optical film having excellent color purity and excellent color characteristics.

As described above, by using the CLC layer having the center wavelength of the reflected light within the range of 420 nm to 510 nm, it is possible to prevent a phenomenon in which the blue light is blushed by reflecting a part of the blue light, The reflected blue light may be reincident to the wavelength conversion layer to further improve the luminous efficiency of the wavelength conversion layer. In addition, the half width and the center wavelength of the blue light can be changed by the reflection characteristics of the CLC layer. For example, when the CLC layer reflects a long wavelength portion of blue light, specifically, a portion of 490 nm to 510 nm, the half width is narrowed and the center wavelength is decreased, thereby providing an optical film having excellent color reproducibility. Therefore, the CLC layer in which the center wavelength of the reflected light is within the range of 420 nm to 510 nm can be located far from the light source portion of the wavelength conversion layer, for example, to achieve the above object.

In addition, by using the CLC layer having the center wavelength of the reflected light within the range of 490 nm to 780 nm, by selectively reflecting light except blue light, the light extraction effect is improved in the wavelength conversion layer, and the color purity is excellent, and the luminance characteristic is excellent. This excellent optical film can be provided. Therefore, the CLC layer in which the center wavelength of the reflected light is within the range of 490 nm to 780 nm can be located, for example, on the light source side of the wavelength conversion layer to achieve the above-mentioned object.

In a more specific example, the optical film including the CLC layer according to the present application is located on the wavelength conversion layer 201, the light source portion of the wavelength conversion layer 201, as shown in FIG. 10, and the central wavelength of the reflected light is 490 nm. And a second CLC layer 203b located at a side far from the light source portion of the first CLC layer 203a and the wavelength conversion layer 201 within a range of 780 nm to 780 nm, and having a central wavelength of reflected light within a range of 420 nm to 510 nm. It may have a structure including a barrier film 202 formed on a surface of the first CLC layer 203a and the second CLC layer 203b that is not in contact with the wavelength conversion layer 201.

The average refractive index of the CLC layer may be in the range of 1.4 to 1.9, 1.4 to 1.8 or 1.4 to 1.67 for 550 nm wavelength, for example. Within the refractive index range as described above, the center wavelength of the reflected light according to Equation 2 can be adjusted to the desired range.

Such a CLC layer can be formed using a well-known CLC composition containing a nematic liquid crystal compound and a chiral dopant, for example. The chiral agent imparts a rotational force to the nematic liquid crystal compound, and the nematic liquid crystal compound is oriented in a layer while the waveguide (optical axis) is twisted along the spiral axis to form a CLC layer by the imparted rotational force. Can be. As the nematic liquid crystal compound, a polymerizable liquid crystal compound called RM (Reactive Mesogen) can be used to polymerize the liquid crystal compound in the aligned state to form a CLC layer. Various CLC compositions are known in the liquid crystal field depending on the desired reflected light wavelength, and all of these known CLC compositions can be applied in the present application.

Accordingly, the CLC layer may be a liquid crystal polymer layer, and the CLC layer may be coated with a composition including the polymerizable nematic liquid crystal compound and a polymerizable or nonpolymerizable chiral agent, The polymer can be formed by polymerizing the composition in a state of inducing a spiral pitch of the liquid crystal compound.

The optical film of the present application may further include a sealing portion that is located on a surface where the barrier layer of the wavelength conversion layer does not exist and seals the wavelength conversion layer.

The sealing part is to prevent the light emitting nanoparticles included in the optical film from being damaged by external factors such as oxygen or water vapor, and may be a layer deposited with a metal or a polymer coating layer. The metal material or the kind of the polymer may be any metal or polymer material used for the water barrier layer or the oxygen barrier layer included in the barrier film described above without limitation.

In the optical film according to the present application, for example, the light transmitting region may be 10% or less of the light emitting surface area of the light guide plate. As such, the optical film according to the present application can achieve the desired optical properties and durability even in a small area compared with the existing large area optical film, and is economical.

The present application also relates to a display device including such an optical member.

An example of the display device according to the present application may be a liquid crystal display including an optical member and a liquid crystal panel, but is not limited thereto.

The configuration of the liquid crystal panel may have a structure including, for example, a pair of substrates and a liquid crystal layer formed between the substrates, and in addition to the above configuration, a liquid crystal panel such as an electrode, a polarizing plate, a color filter, a diffusion sheet, and an alignment film. All known configurations that can be applied to may be included without limitation.

1000: optical member
100: light source
101: light source
200: optical film
201 wavelength conversion layer
201 a: first floor
201b: second layer
202: barrier film
202 a: moisture barrier layer
202 b: oxygen barrier layer
202 c: adhesive layer or adhesive layer
202 d: high hardness layer
203: reflective layer
203a: first CLC layer
203b: second CLC layer
204: sealing part
205: light transmission region of the optical film
300 light guide plate
301: light incident surface
302: light exit surface

Claims

A light source unit including a light source; And
An optical film including a wavelength converting layer disposed adjacent to the light source unit and including a wavelength converting layer including wavelength converting particles and both sides of the wavelength converting layer;
The wavelength conversion layer absorbs light of any wavelength within a range of 420 nm to 490 nm, and thus emits light of any wavelength within a range of 490 nm to 580 nm, or light of any wavelength within a range of 420 nm to 490 nm. A second wavelength conversion particle that absorbs and emits light of any wavelength within a range of 580 nm to 780 nm,
The optical film is a first cholesteric liquid crystal layer and the first cholesteric liquid crystal layer is located on the side closer to the light source portion of the wavelength conversion layer, the center wavelength of the reflected light (λ _o ) is determined in accordance with Equation 2 below 490 nm to 780 nm An optical member further comprising a second cholesteric liquid crystal layer positioned far from the light source portion of the wavelength conversion layer and having a center wavelength λ _o of the reflected light defined by Equation 2 below within a range of 420 nm to 510 nm:
[Formula 2]
λ _o = n × p × cosθ
In Equation 2, λ _o is the central wavelength of the reflected light of the cholesteric liquid crystal layer, n is the average refractive index of the cholesteric liquid crystal layer, p is the pitch of the cholesteric liquid crystal layer, θ is the surface of the cholesteric liquid crystal layer The incident angle (unit: degrees) of light incident on the cholesteric liquid crystal layer measured based on a normal line.

The method of claim 1,
The light source emits light of any wavelength within the range of 420 nm to 490 nm.

The method of claim 1,
An optical member further comprising a light guide plate arranged to guide light from the light source portion to the liquid crystal panel.

The method of claim 3, wherein
The light guide plate includes a light incidence surface formed in a region corresponding to the light source unit and a light emission surface for guiding light passing through the light incidence surface to the liquid crystal panel.

The method of claim 3, wherein
An optical member formed so that a light transmitting region of an optical film and a light incident surface region of a light guide plate correspond to each other.

The method of claim 1,
The wavelength conversion particle is an optical member which is a quantum dot or a polymer particle.

The method of claim 1,
The wavelength conversion layer includes the first wavelength conversion particle and the second wavelength conversion particle.

The method of claim 1,
The wavelength conversion layer has an optical member having a first layer including the first wavelength conversion particles and a second layer including the second wavelength conversion particles.

The method of claim 1,
The wavelength conversion layer includes a matrix in a continuous phase and an emulsion region dispersed in the matrix in the continuous phase, wherein the wavelength converting particles are present in the continuous phase or the emulsion region.

The method of claim 9,
The matrix is a compound of Formula 1 to 4; Nitrogen-containing radically polymerizable compounds; And (meth) acrylic acid or a polymerizable unit selected from among radically polymerizable compounds comprising a salt site thereof.
[Formula 1]

[Formula 2]

[Formula 3]

[Formula 4]

In Formulas 1 to 4, Q ₁ is each independently hydrogen or an alkyl group,
U ₁ is each independently an alkylene group,
A each independently represents an alkylene group which may be substituted with a hydroxy group,
Z is hydrogen, an alkoxy group, an epoxy group or a monovalent hydrocarbon group,
X ₁ is a hydroxy group or a cyano group,
m and n are any number.

The method of claim 9,
The emulsion region includes an optical member comprising polymerized units of a compound represented by any one of Formulas 5 to 7 below:
[Formula 5]

[Formula 6]

[Formula 7]

In Formulas 5 to 7, each Q ₂ is independently hydrogen or an alkyl group,
Each U ₂ is independently an alkylene group, an alkenylene group, an alkynylene group or an arylene group,
B is a straight or branched chain alkyl group having 5 or more carbon atoms or an alicyclic hydrocarbon group,
Y is an oxygen atom or a sulfur atom,
X ₂ is an oxygen atom, a sulfur atom or an alkylene group,
Ar is an aryl group,
n is any number.

The method of claim 9,
The weight ratio of the wavelength conversion particle contained in an emulsion area | region is 90% or more with respect to the total wavelength conversion particle contained in a wavelength conversion layer.

The method of claim 9,
The emulsion region includes an A region including the first wavelength conversion particle or a B region including the second wavelength conversion particle.

The method of claim 1,
The barrier film is an optical member including a water barrier layer having a water vapor transmission rate (WVTR) of 10 ⁻¹ g / m ² / day or less.

The method of claim 14,
The barrier film further includes an oxygen barrier layer on one or both surfaces of the moisture barrier layer.

delete

The method of claim 1,
The optical film is an optical member including a sealing portion located on the surface where the barrier film of the wavelength conversion layer does not exist, sealing the wavelength conversion layer.

The method of claim 3, wherein
The optical film is an optical member whose light transmissive area is 10% or less of the light exit surface area of the light guide plate.

A display device comprising the optical member of claim 1.