KR20150040529A - Organic light emitting diode display - Google Patents

Abstract

The present invention relates to an organic light emitting diode display which improves visibility and improves brightness. Specifically, provided is an organic light emitting diode display using a transparent film having a high refractive layer and a low refractive layer sequentially laminated on the transparent base material with a photochromic hard layer and a reflection preventing layer as an outermost layer.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an organic light-

The present invention relates to an organic light emitting display device having excellent visibility and brightness.

Recently, organic light emitting display (OLED) has become more popular among flat panel displays because it can realize a clear color, can be made in an ultra-thin design, can operate at an ultra low power (2 ~ 1-V) Design, and so on.

The structure of the OLED includes a glass substrate and a metal electrode. The metal electrode exhibits a reflection effect like a mirror, and uses a quarter wavelength film to suppress the reflection of external light introduced into the panel.

However, due to the metal electrode, the OLED has a strong reflection of external light, and particularly when used outdoors, the screen visibility is poor. In addition, when anti-glare is caused by irregular reflection using surface irregularities, there is a problem that the sharpness of the image is deteriorated.

Typically, polarizing films and λ / 4 phase retardation films are used to solve this problem. When this is used, the reflectivity of external light is lowered. However, due to the polarizing film, the transmissivity is greatly reduced at the same time and the display efficiency is lowered.

An object of the present invention is to provide an organic light emitting device (OLED) that improves the visibility and has excellent brightness without including a conventional polarizing film and a retardation film.

The present invention relates to a substrate; A first electrode; An organic light emitting layer; A second electrode; And an outer protective film including a photochromic hard layer and an antireflective layer formed on the transparent substrate,

Wherein the antireflection layer comprises a structure in which a high refractive index layer having a refractive index of 1.60 to 2.50 and a low refractive layer having a refractive index of 1.25 to 1.42 are sequentially laminated.

An organic light emitting display device is provided.

The antireflection layer may further comprise a medium refractive index layer having a refractive index of 1.55 to 1.75 between a photochromic hard layer and a high refractive index layer having a refractive index of 1.60 to 2.50.

The low refraction layer may be formed by curing a composition containing 100 to 300 parts by weight of hollow particles based on 100 parts by weight of the binder of the acrylate crosslinked polymer.

The hollow particles may have a number average particle diameter of 5 to 80 nm.

The high refractive index layer may be formed by curing a composition containing 70 to 700 parts by weight of inorganic fine particles based on 100 parts by weight of the binder of the acrylate crosslinked polymer.

The middle refractive layer may be formed by curing the composition containing 70 to 700 parts by weight of the inorganic fine particles based on 100 parts by weight of the binder of the acrylate crosslinked polymer.

The inorganic fine particles may be ZrO ₂ , ZnO, CeO ₂ , TiO ₂ , SnO ₂ , Sb ₂ O ₃ , ATO (Antimony doped SnO 2), AZO (Antimony doped ZnO), ITO, GZO doped ZnO) and PTO.

The high refractive index layer and the low refractive index layer may each be formed to a thickness of 10 nm to 200 nm. The intermediate refraction layer may be formed to a thickness of 10 nm to 200 nm.

The photochromic hard layer may be at least 20% lower in transmittance by UV curing. The reflectance of the antireflection layer may be 2% or less.

The present invention can adjust the visual sensation by using an outermost film of a transparent film in which a hard layer and a low refractive layer having a photochromic component are sequentially laminated in an organic light emitting device, and the reflectance can be greatly lowered. In particular, the present invention can reduce the degree of fatigue of a user by reducing the reflectivity without including the conventional polarizing film and the retardation film.

1 schematically shows a cross-sectional view of an anti-reflection layer in a panel for an organic light emitting device according to an embodiment of the present invention.
2 schematically shows a cross-sectional view of an anti-reflection layer in a panel for an organic light emitting device according to another embodiment of the present invention.

Hereinafter, an organic light emitting device according to a specific embodiment of the present invention will be described in detail.

According to an embodiment of the invention, there is provided a lithographic apparatus comprising: a substrate; A first electrode; An organic light emitting layer; A second electrode; And an outer protective film including a photochromic hard layer and an antireflective layer formed on a transparent substrate, wherein the antireflective layer has a structure in which a high refractive index layer having a refractive index of 1.60 to 2.50 and a low refractive layer having a refractive index of 1.25 to 1.42 are sequentially laminated An organic electroluminescent device is provided.

Among the surface treated films, anti-reflective coating film is a film having high transmittance and low reflection property. In the field of optical display, it has anti-glare function together with protection of display surface, thereby improving visibility Functional film. Therefore, the present invention can improve the visibility of display by lowering the reflectance as well as controlling the visual sensation by including at least one anti-reflection layer including the low refraction layer as the outermost transparent protective film of the organic light emitting device.

Specifically, in the present invention, the conventional polarizing film and the? / 4 retardation film are removed to improve the visibility of the screen and the brightness, and a photochromic hard coating layer and an anti-reflection coating layer The stacked structure in this order is introduced into the outermost protective film of the OLED. Therefore, the outer protective film includes an outermost transparent protective film.

At this time, the present invention can prevent the glare by using one or more antireflection layers having different refractive indexes on the photochromic hard layer, thereby remarkably reducing the reflectivity.

That is, the antireflection layer may coat several layers of coating layers having different refractive indexes to induce extinction interference of external light to reduce the reflectivity. Such an antireflection layer is a multi-layered structure composed of two or more kinds of materials, which causes optical extinction interference and has a reflectance of 2% or less. The antireflection layer may have various laminated structures such as a medium refractive index, a high refractive index, a low refractive index, a high refractive index, and a low refractive index. The case where the antireflection layer has three layers and the case where the antireflection layer has two layers are shown in Figs. 1 and 2, respectively. However, the present invention is not limited thereto.

1 schematically shows a cross-sectional view of an anti-reflection layer in a panel for an organic light emitting device according to an embodiment of the present invention. 2 schematically shows a cross-sectional view of an anti-reflection layer in a panel for an organic light emitting device according to another embodiment of the present invention.

Referring to FIG. 1, the antireflection layer of the present invention has a structure in which a photo-discoloration hard layer 2 is formed on a transparent substrate 1, and then a high refractive index layer 4 and a low refractive index layer 5 are sequentially laminated .

2, the antireflection layer of the present invention is formed by forming a photochromic hard layer 2 on a transparent substrate 1 and then forming a high refraction layer 4 and a low refraction layer 5 ) Are stacked in this order.

In the outer protective film of the present invention having such a structure, the structure of the antireflection layer according to one preferred embodiment will be described in more detail.

The high refractive index layer may have a refractive index of 1.60 to 2.50 and may be formed by curing a composition containing 70 to 700 parts by weight of inorganic fine particles based on 100 parts by weight of the binder of the acrylate crosslinked polymer.

The low refraction layer may have a refractive index of 1.25 to 1.42 and may be formed by curing a composition containing 100 to 300 parts by weight of hollow particles based on 100 parts by weight of the binder of the acrylate crosslinked polymer.

Further, the antireflection layer may further include a medium refractive index layer having a refractive index of 1.55 to 1.75 between the photochromic hard layer and the high refractive index layer having a refractive index of 1.60 to 2.50. At this time, the middle refractive layer may be formed by curing the composition containing 70 to 700 parts by weight of the inorganic fine particles based on 100 parts by weight of the binder of the acrylate crosslinked polymer. In the case of the medium refractive index layer, the refractive index can be controlled to be lower than that of the high refractive index layer by controlling the content of inorganic particles relative to the high refractive index layer and the type and content of the binder.

In the present invention, each of the crosslinked polymers contained in the middle refractive layer, the high refractive layer and the low refractive layer may be a crosslinked copolymer of an acrylate compound having a weight average molecular weight of less than 600.

The acrylate crosslinked polymer may be a polyfunctional acrylate monomer having 3 to 6 functional groups, and examples thereof include pentaerythritol triacrylate, pentaerythritol tetraacrylate, dipentaerythritol hexaacrylate, trimethylene propane triacrylate, But are not limited to, dipentaerythritol hexaacrylate, dipentaerythritol heptaacrylate, dipentaerythritol hydroxypentaacrylate, pentaerythritol tetraacrylate, pentaerythritol triacrylate, trimethylene propyl triacrylate, propoxylated glycerol triacrylate, 1,6-hexanediol At least one selected from the group consisting of diacrylate, propoxylated glycerol triacrylate, tripropylene glycol diacrylate, and polyfunctional acrylate monomers composed of ethylene glycol diacrylate can be used. For example, the polyfunctional acrylate monomer may be a mixture of pentaerythritol triacrylate and dipentaerythritol heptaacrylate.

In addition, the hollow particles may be contained in the form of a layer, and may be dispersed on the photochromic hard layer by mixing with the crosslinked polymer. When the hollow particles are contained in the form of a layer, a plurality of hollow particles continuously connected in a direction parallel to the substrate may be densely distributed in the form of layers. Therefore, the low refraction layer of the present invention can exhibit an excellent antireflection effect.

The hollow particles may have a number average particle diameter of 5 to 80 nm. The particle size of the hollow particles can be determined within a range capable of maintaining the transparency of the film and exhibiting the antireflection effect. According to another example, the hollow particles may have a number average particle size of from 10 to 75 nm, or from about 20 to 70 nm.

Here, the 'hollow particles' may mean particles in the form of voids existing on the surface and / or inside of the organic or inorganic particles. For example, the term 'hollow silica particles' refers to silica particles derived from a silicon compound or an organosilicon compound, and particles having a void space on the surface and / or inside of the silica particles. Therefore, the antireflection layer of the present invention can prevent the glare by reducing the reflectivity by using hollow particles.

As such hollow particles, at least one selected from the group consisting of various metal oxides such as MgF ₂ , SiO ₂ , ZrO ₂ , SnO ₂ , and Ga ₂ O ₃ can be used. The compounds shown in the above examples have a shape with an empty center portion as described above, and thereby the refractive index can be controlled.

The hollow particles may be used in an amount of 100 to 300 parts by weight based on 100 parts by weight of the acrylate crosslinked polymer. The content of the hollow particles can be adjusted within the range described above so that a desirable distribution according to the phase separation can be formed while exhibiting the minimum effect by the hollow particles.

The inorganic fine particles contained in the medium refractive index layer and the high refractive index layer may be ZrO ₂ , ZnO, CeO ₂ , TiO ₂ , SnO ₂ , Sb ₂ O ₃ , ATO (Antimony doped SnO 2), or TiO ₂ having an average particle size of 1 nm to 40 nm, At least one selected from the group consisting of AZO (antimony doped ZnO), ITO, GZO (Gallium doped ZnO), and PTO can be used.

Preferably, in the case of wet coating, the material of the low refraction layer may be MgF ₂ , SiO _2, etc., and the materials of the high refraction and high refraction layers may be ZrO ₂ , ZnO, CeO ₂ , TiO ₂ , SnO ₂ , Sb ₂ O ₃ , ATO (Antimony doped SnO ₂ ), AZO (Antimony doped ZnO), ITO, GZO (Gallium doped ZnO), PTO, Cr ₂ O ₃ and the like.

The hollow particles or the inorganic particles may be dispersed in a dispersion medium (water or an organic solvent) and may be contained in a colloidal phase having a solid content of 5 to 40% by weight. Therefore, each composition for forming the antireflection layer of the present invention may further include a solvent which is a dispersion medium. Examples of the organic solvent usable as the dispersion medium include alcohols such as methanol, isopropyl alcohol (IPA), ethylene glycol, and butanol; Ketones such as methyl ethyl ketone and methyl iso butyl ketone (MIBK); Aromatic hydrocarbons such as toluene and xylene; Amides such as dimethyl formamide, dimethyl acetamide and N-methyl pyrrolidone; Esters such as ethyl acetate, butyl acetate and? -Butyrolactone; Ethers such as tetrahydrofuran, 1,4-dioxane and propylene glycol methyl ether; Or a mixture thereof.

The composition for forming the medium refractive index layer, the high refractive index layer and the low refractive index layer may further comprise a photoinitiator. The type of the photoinitiator is not particularly limited, and materials well known in the art can be used. For example, the photoinitiator may be selected from the group consisting of 1-hydroxycyclohexyl phenyl ketone, benzyl dimethyl ketal, hydroxymedimethylacetophenone, benzoin, benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether, benzoin butyl ether . The photoinitiator is used in an amount of 5 to 60 parts by weight based on 100 parts by weight of the acrylate crosslinked polymer.

The high refractive index layer and the low refractive index layer may be formed to have a thickness of 10 nm to 200 nm through curing. Further, the middle refractive layer may be formed to a thickness of 10 nm to 200 nm.

The antireflection layer of the present invention provided in this way may have an average reflectance of 2% or less.

On the other hand, the method for producing the antireflection layer is not particularly limited, and a dry method, a wet method, or the like can be used. Preferably, the antireflection layer can be produced by a wet process. The dry method is a method of laminating a plurality of thin film layers by vapor deposition, sputtering or the like. The wet method is a method of applying a composition including a binder, a solvent, and the like onto a substrate, drying and curing the composition, and its manufacturing cost is lower than that of the dry method, and it is widely used commercially.

On the other hand, the photochromic hard layer refers to a photochromic coating layer containing the photochromic dye, and since it has a characteristic of discoloring due to UV, it is colored when used outdoors so that the reflection of strong external light can be reduced, It is possible to maintain an appropriate screen contrast depending on the situation.

The photochromic hard layer may be formed using a composition comprising a photochromic dye, an acrylate binder and a photoinitiator.

Preferably, the photochromic hard coating layer may be formed by using a hard coating liquid composition comprising 100 to 10 parts by weight of the multifunctional acrylate monomer, 0.5 to 10 parts by weight of a photochromic dye and 1 to 10 parts by weight of a photoinitiator .

The acrylate binder may be a polyfunctional acrylate having two or more functional groups. Examples of the acrylate binder include pentaerythritol triacrylate, pentaerythritol tetraacrylate, dipentaerythritol hexaacrylate, trimethylene propane triacrylate, dipentaerythritol hepta Acrylate, dipentaerythritol hydroxypentaacrylate, pentaerythritol tetraacrylate, pentaerythritol triacrylate, trimethylene propyl triacrylate, propoxylated glycerol triacrylate, 1,6-hexanediol diacrylate, and Acrylate monomers such as ethylene glycol diacrylate, and acrylate oligomers may be used alone or in admixture.

The photochromic dye used in the photochromic hard coating composition may be any compound that exhibits ordinary photochromic properties. Representative examples include naphthopyran, benzopyran, phenanthropyran, indenonaphthopyran, spiro (benzindolin) naphthopyran, spiro (indolin) benzopyran, spiro (indolin) naphthopyran, (Benzindolin) naphthol, spiro (indolin) pyridobenzoxazine, spiro (indoline) pyridobenzoxazine, spiro (indolin) (Dithioguanite), fulgide, fulgimide, and the like may be directly manufactured or used in the manufacture of a dentifrice composition according to the present invention, Commercially available ones can be purchased and used.

The photochromic dye is used in an amount of 0.5 to 10 parts by weight, preferably 1.5 to 6 parts by weight, based on 100 parts by weight of the acrylate binder. If the content of the photochromic dye is less than the above range, the resulting coating film may not have adequate photochromic properties, and if the content is out of the above range, the dye may not sufficiently dissolve in the coating liquid and may be precipitated, which is economically undesirable .

The photoinitiator used in the photochromic hard coating composition is not particularly limited, and any of those conventionally used in this field can be used. For example, the photoinitiator may be 1-hydroxycyclohexyl phenyl ketone, benzyldimethyl ketal, hydroxymedimethylacetophenone, benzoin, benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether, benzoin butyl ether, etc. . The photoinitiator is used in an amount of 1 to 10 parts by weight based on 100 parts by weight of the acrylate binder resin.

Also, in the present invention, the photoinitiator used in the hard layer may be 1-hydroxycyclohexyl phenyl ketone, benzyl dimethyl ketal, hydroxy dimethyl acetophenone, benzoin, benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether, And benzoin butyl ether. The polymerization initiator is a compound capable of being activated by an energy ray such as ultraviolet rays to induce the polymerization reaction of the compound for forming a binder, and a compound common in the art can be used.

Meanwhile, the hard coating layer according to the above-described embodiment may further include a solvent. The solvent serves to adjust the viscosity of the composition to an appropriate range and to control the smooth phase separation and distribution tendency of the hollow particles.

The solvent may be at least one selected from the group consisting of alcohols, ketones, aromatic hydrocarbons, amides, esters and ethers in order to sufficiently exhibit the above effects. In addition, any solvent that satisfies the above properties may be used in the present invention. Examples of such a solvent include methanol, ethanol, isopropyl alcohol, butyl alcohol, isobutyl alcohol, methyl ethyl ketone, methyl isobutyl ketone, acetylacetone, or acetone, but it is not limited to the examples .

If the flowability of the composition is poor, defects such as streaks may occur in the coating layer. In order to impart the minimum flowability required for the composition, the solvent may be contained in a certain amount or more. For example, the solvent may be contained in an amount of 300 to 2000 parts by weight based on 100 parts by weight of the polyfunctional acrylate-based monomer. At this time, when the solvent is added in excess, the solid content may be excessively low, resulting in defects during drying and curing, and the distribution tendency of the hollow particles may deviate from the preferable range.

The composition for forming the photochromic hard layer may be formed by a wet coating method such as a bar coating or an applicator coating. Also, the thickness of the hard coating layer may be 1 to 8 탆. The photochromic hard layer has the effect of lowering the transmittance by at least 20% by UV curing.

Therefore, in the method for producing an external protective film of the present invention, a hard layer and an antireflection layer can be formed on a transparent substrate by a coating method, respectively.

The transparent substrate is not limited as long as it is an optically transparent transparent substrate. For example, the transparent material may be at least one film selected from the group consisting of triacetylcellulose (TAC) polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polycarbonate (PC) and norbornene polymer However, the present invention is not limited thereto, and any substrate well known in the art can be used.

Further, in the above-described method for producing an external protective film, the method of applying the photochromic hard layer and the composition for forming the antireflective layer on at least one side of the substrate is performed using a conventional coating apparatus and method well known in the art . For example, the present invention can be carried out using a wet coating method such as a roll coating method, a bar coating method, a spray coating method, a dip coating method, or a spin coating method.

Further, the drying step is preferably carried out at a temperature of 5 to 150 DEG C for 0.1 to 60 minutes, more preferably at a temperature of 20 to 120 DEG C for 0.1 to 20 minutes, most preferably Lt; RTI ID = 0.0 > 110 C < / RTI > for 1 to 10 minutes.

The curing method for forming the photochromic hard-layering antireflection layer is not limited in its use and can be used in a method known in the art. For example, the curing method may be initiated by adding energy to the dried composition, such as by irradiating light to the composition, thereby curing the eroded and dried composition. This curing step is preferably carried out for 1 to 600 seconds at an ultraviolet radiation dose of 0.1 to 2 J / cm 2, more preferably for 2 to 200 seconds at an ultraviolet radiation dose of 0.1 to 1.5 J / cm 2, To 1 J / cm < 2 > for 3 to 100 seconds.

On the other hand, in the embodiment of the present invention, although not shown in the drawings for the constitution of the organic light emitting element, it can be provided by a method well known in the art, except for the configuration of the antireflection layer of the outermost layer described above .

Accordingly, the method of manufacturing an organic light emitting device includes forming a first electrode on a substrate, forming an organic light emitting layer for emitting light on the first electrode, Forming a second electrode for transmitting the first electrode, and forming an anti-reflection layer on the second electrode.

In addition, a general transparent substrate such as a silicon substrate, an organic substrate, and a plastic may be used for the substrate. The substrate may also include a flexible substrate.

The first electrode may be a transparent electrode formed by vacuum deposition or sputtering of a conductive material such as ITO, IZO or ITZO. The second electrode may be a metal electrode applied to the organic light emitting device, and the structure thereof is not limited.

In addition, the organic light emitting device of the present invention may include a light emitting layer including a hole related layer, an organic light emitting layer, and an electron related layer. In the hole-related layer, a hole injection layer (Hole Injection Layer) and a hole transport layer (Hole Transport Layer) are sequentially formed on the transparent electrode.

The organic light emitting layer functions to emit light, but it mainly functions to transport electrons or holes.

In the electron-related layer, an electron transport layer and an electron injection layer may be sequentially stacked on the organic emission layer. The light-emitting layer including the hole-related layer, the organic light-emitting layer, and the electron-related layer may be formed by vacuum evaporation in the case of a low molecular compound and may be formed by spin coating or inkjet printing in the case of a polymer compound. At this time, the material of the organic light emitting layer can be formed using a material well known in the art, so a detailed description thereof will be omitted.

The organic light emitting device having such a structure can improve the visibility and greatly increase the luminance as compared with the conventional one.

Hereinafter, the present invention will be described in more detail with reference to the following examples. However, the scope of the present invention is not limited to the following examples.

Example  One

(1) Formation of a photochromic hard layer

A coating solution was prepared by mixing 60 g of 6-functional urethane acrylate (3061 of Kyroeisha), 2 g of photoinitiator (Irgacure 184 of Ciba), 4 g of photochromic dye (Reversacol Graphite of Vivimed) and methyl ethyl ketone (MEK) as a solvent. Thereafter, the resultant was coated on a TAC film and UV-cured to form a photochromic hard coat layer (thickness: 7 탆).

(2) Formation of antireflection layer

(MR), high refractive index (HR) and low refractive index (LR) coating liquids were prepared by using inorganic particles, a binder, an initiator and a solvent (PGME) Each of them was sequentially coated on the hard coat layer and UV cured to form an antireflection layer. Through this process, the middle refraction layer, the high refraction layer and the low refraction layer were formed with thicknesses of 100 nm, 30 nm and 110 nm, respectively.

The particles used for the middle (MR) layer and the high refractive index (HR) layer were ZrO ₂ and the low refractive (LR) layer was hollow SiO ₂ , all of which were dispersed in MIBK at a concentration of 20%.

Also, the above-mentioned antireflection layer was used as an outermost transparent film, and a transparent substrate, a first electrode, an organic light emitting layer, a second electrode and an antireflection layer were formed by a conventional method to prepare an organic light emitting device. The content unit in Table 1 is g.

MR HR LR Particles in MIBK (20%) ZrO ₂ 4
(Solid content 0.8) 7
(Solid content 1.4) SiO ₂ 6
(Solid content 1.2) PETA 1.1 0.5 One Irgacure 184 0.1 0.1 0.2 MIBK 20 60 50 PGME 14.8 32.4 22.8 Total gross (g) 40 100 80 s.c. (%) 5 2 3

Note) In Table 1,

PETA: pentaerythritol triacrylate

MIBK: methyl isobutyl ketone

Irgacure 184: initiator

PGME: Propylene glycol methyl ether

Comparative Example  One

An antireflective layer and an organic light emitting device were prepared in the same manner as in Example 1 except that a general hard layer prepared by the following method was used in place of the photochromatic hard layer.

Hard floor  formation

60 g of 6-functional urethane acrylate (3061 of Kyroeisha), 2 g of photoinitiator (Irgacure 184 of Ciba) and 38 g of methyl ethyl ketone (MEK) as a solvent were mixed to prepare a coating solution. Thereafter, the resultant was coated on a TAC film and UV-cured to form a photochromic hard coat layer (thickness: 7 탆).

[Experimental Example]

The properties of the antireflection films prepared in Examples and Comparative Examples were evaluated and the results are shown in Table 2 below.

1) Reflectance measurement: After the back side of the antireflection film was blackened, the low reflection property was evaluated by the minimum reflectance value. At this time, as the measurement equipment, Shimadzu's Solid Spec. 3700 spectrophotometer was used.

2) Measurement of transmittance and haze: The transmittance and haze were evaluated using HR-100 manufactured by Murakami Co., Ltd. of Japan.

Reflectivity (%) Transmittance (%) Haze (%) Example 1 UV cooking dictionary 0.4 97 0.3 After UV irradiation 0.4 45 0.3 Comparative Example 1 UV cooking dictionary 0.3 97 0.3 After UV irradiation 0.3 97 0.3

As can be seen from Table 1, Example 1 was excellent in reflectance and haze characteristics as compared with Comparative Example 1. [ It was also confirmed that the photochromic hard layer of Example 1 had a transmittance lower by 20% or more by UV. Therefore, the organic light emitting device including such a transparent film can improve the visibility, increase the brightness, and reduce the fatigue of the user.

1: transparent substrate
2: Photochromic hard layer
3: medium refraction layer
4: High-refraction layer
5: low refractive layer

Claims (11)

Board;
A first electrode;
An organic light emitting layer;
A second electrode; And
An outer protective film including a photochromic hard layer and an antireflection layer formed on a transparent substrate,
Wherein the antireflection layer comprises a structure in which a high refractive index layer having a refractive index of 1.60 to 2.50 and a low refractive layer having a refractive index of 1.25 to 1.42 are sequentially laminated.
Organic light emitting device.
The method according to claim 1,
Wherein the antireflection layer further comprises a medium refractive layer having a refractive index between 1.55 and 1.75 between a photochromic hard layer and a high refractive index layer having a refractive index of 1.60 to 2.50.
Organic light emitting device.
The method according to claim 1,
Wherein the low refraction layer is formed by curing a composition including 100 to 300 parts by weight of hollow particles based on 100 parts by weight of a binder of an acrylate crosslinked polymer.
The method of claim 3,
Wherein the hollow particles have a number average particle diameter of 5 to 80 nm.
The method according to claim 1,
Wherein the high refractive index layer is formed by curing a composition containing 70 to 700 parts by weight of inorganic fine particles based on 100 parts by weight of a binder of an acrylate crosslinked polymer.
3. The method of claim 2,
Wherein the medium refractive layer is formed by curing a composition containing 70 to 700 parts by weight of inorganic fine particles based on 100 parts by weight of a binder of an acrylate crosslinked polymer.
The method according to claim 5 or 6,
The inorganic fine particles may be ZrO ₂ , ZnO, CeO ₂ , TiO ₂ , SnO ₂ , Sb ₂ O ₃ , ATO (Antimony doped SnO 2), AZO (Antimony doped ZnO), ITO, GZO doped ZnO), and PTO.
The method according to claim 1,
Wherein the high refractive index layer and the low refractive index layer are each formed to a thickness of 10 nm to 200 nm.
3. The method of claim 2,
Wherein the intermediate refraction layer is formed to a thickness of 10 nm to 200 nm.
The method according to claim 1,
Wherein the photochromic hard layer is at least 20% lower in transmittance by UV curing.
The method according to claim 1,
Wherein the antireflection layer has a reflectance of 2% or less.

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