KR20140110677A - Film for improving color sense and method for preparing the same - Google Patents

Abstract

The present invention relates to a color improving film in which a base layer; a high-refractive resin layer with an optical pattern on one surface; and a low-refractive resin layer including a light-diffusing material are successively stacked, and the high-refractive resin layer with the optical pattern on one surface and the low-refractive resin layer with the dispersed light-diffusing material are bonded. The manufacturing method of the color improving film includes a step of manufacturing the high-refractive resin layer by forming an engraved optical pattern after coating one surface of the base layer with high-refractive transparent resin; a step of manufacturing a low-refractive optical diffusion layer by dispersing the light-diffusing material in the low-refractive transparent resin; and a step of bonding one surface of the low-refractive light diffusion layer on a surface with the optical pattern with the high-refractive resin layer. The color improving film of the present invention has a low color change according to the viewing angle and has excellent light transmittance and light diffusibility, and the manufacturing method thereof has excellent processibility and economic efficiency.

Description

TECHNICAL FIELD [0001] The present invention relates to a color improving film,

The present invention relates to a color improving film and a manufacturing method thereof, and more specifically, to a color improving film having little change in color depending on a viewing angle and a manufacturing method thereof.

A liquid crystal light emitting device is a panel in which liquid crystals regularly arranged in a planar reinforced glass are arranged, and a back light is emitted behind the panel to express colors and images. More specifically, the light emitted from the backlight is refracted in a plurality of patterns while passing through a large number of liquid crystals, and again passes through a filter positioned on the front surface of the liquid crystal, and becomes a pixel (pixel) . Such a liquid crystal light emitting device has been continuously demanded for the development of a new display because the quality of the liquid crystal light emitting device is low and the production cost is low, but the complication of the process, the slow response speed, the narrow viewing angle and the high power consumption have been pointed out.

As a next-generation display that compensates for the disadvantages of liquid crystal displays (LCDs), organic light emitting device displays are attracting attention. The organic light emitting device utilizes the luminescent property that emits light when a current flows through the fluorescent organic compound, and colors are realized by using the characteristics of expressing R, G, and B according to the organic material. With high resolution, wide viewing angle, low power driving, and fast response time, it is possible to display natural images because no afterimage is left, which is widely used in general digital TV as well as portable devices. However, an organic light emitting device display such as an OLED TV may exhibit a color change depending on a viewing angle.

Korean Unexamined Patent Publication No. 2008-0081362 discloses a liquid crystal display having a background layer for layering and a plurality of intaglio lens portions spaced apart from each other on the background layer to improve the color change according to the viewing angle of the liquid crystal display, And the filling part has different refractive indexes. In order to obtain the color improvement effect, however, such a prior art requires a considerably large aspect ratio of the lens, and it is easy to perform the bite processing and the roll processing using such bite If mass production is considered, the increase in production cost can not be avoided due to the problem of rapid yield reduction. In order to achieve sufficient color improvement, the difference in refractive index between the two resins must be maximized. The high refractive index resin has a problem in adhesion with the film in the processing using a roll. The low refractive resin is expensive due to difficulty in manufacturing, There is no problem.

Therefore, it is urgently required to develop an optical film for an organic light emitting device display which is excellent in processability and economical efficiency and has little color change depending on a viewing angle.

It is an object of the present invention to provide a color improvement film having little color change depending on a viewing angle.

Another object of the present invention is to provide a color improvement film excellent in light transmittance and light diffusibility.

Another object of the present invention is to provide a color improvement film excellent in reliability.

It is still another object of the present invention to provide a method for producing a color improving film excellent in processability and economical efficiency.

The above and other objects of the present invention can be achieved by the present invention described below.

One aspect of the present invention relates to a substrate layer; A high-refraction resin layer in which an optical pattern is formed; And a low refractive index light diffusion layer including a light diffusing agent and a high refractive index resin layer which is opposed to the low refractive index light diffusion layer.

The high refractive index resin layer may include an ultraviolet ray curable transparent resin having a refractive index of 1.50 to 1.60.

The low refraction light diffusion layer may include an ultraviolet curable transparent resin having a refractive index of 1.35 to 1.45.

Wherein the optical pattern is composed of a plurality of lenticular concave lenses and the lenticular concave lens has a width D of 1 to 1,000 占 퐉, a depth H of 1 to 2,000 占 퐉, an aspect ratio H / D of 1 Lt; / RTI >

The optical pattern may have a spacing L between neighboring lenticular concave lenses and the ratio L / D of the spacing distance L to the width D of the lenticular concave lens may be 3.0 or less.

The high refractive index resin layer and the low refractive index resin layer may include an ultraviolet ray curable resin having an acrylate functional group.

Wherein the light diffusing agent is an organic light-diffusing agent, an inorganic light-diffusing agent, or a mixture thereof,

The organic light-diffusing agent includes at least one member selected from the group consisting of acrylic particles, siloxane particles, melamine particles, polycarbonate particles, and styrene particles,

The inorganic light-diffusing agent may include at least one selected from the group consisting of calcium carbonate, barium sulfate, titanium dioxide, aluminum hydroxide, silica, glass, talc, mica, white carbon, magnesium oxide and zinc oxide.

The organic light-diffusing agent may have an average particle diameter (D50) of 2 탆 to 20 탆.

Wherein the organic light diffusing agent comprises polymer particles coated with a black dye and uncoated particles, wherein the polymer particles coated with the black dye are polymethylmethacrylate (PMMA) particles, and the uncoated particles are silicone particles , Acrylic particles, or a mixture thereof.

The organic light diffusing agent may include the polymer particles coated with the black dye and the uncoated particles at a weight ratio of 1: 4 to 4: 1.

The light diffusing agent may be included in an amount of 0.1 to 10 wt% of the light diffusing layer.

The thickness of the substrate layer may be 30 to 100 占 퐉, the maximum thickness of the high refractive index resin layer may be 5 to 80 占 퐉, and the thickness of the low refractive index light diffusion layer may be 5 to 50 占 퐉.

An adhesive layer may be further laminated on one surface of the low refractive index light diffusion layer.

The base layer may include a triacetate cellulose (TAC), a polyethylene terephthalate (PET), a polycarbonate (PC), or a polyvinyl chloride (PVC).

According to another aspect of the present invention, there is provided a method of manufacturing a high refractive index resin layer, comprising: coating a high refractive index transparent resin on one surface of a substrate layer; Dispersing a light diffusing agent in a low refractive transparent resin to produce a low refractive light diffusing layer; And bonding one surface of the low refractive index light diffusion layer to a surface of the high refractive index resin layer on which the optical pattern is formed.

And forming a pressure-sensitive adhesive layer by applying a pressure-sensitive adhesive on the other surface of the light-diffusing layer.

The high refractive index transparent resin may be an ultraviolet curable transparent resin having a refractive index of 1.50 to 1.60, and the low refractive transparent resin may be an ultraviolet curable transparent resin having a refractive index of 1.35 to 1.45.

According to another aspect of the present invention, there is provided an organic light emitting display comprising: a first electrode; a second electrode facing the first electrode; and an organic light emitting film formed between the first electrode and the second electrode; And a color enhancement film according to any one of claims 1 to 16 provided on a light exit surface of the second electrode, wherein the organic light emitting device has an organic light emitting element having a resonance structure so as to realize an image with a color reflected from each pixel of the organic light emitting film And a display device.

The organic light emitting layer may include a hole injection layer (HIL), a hole transport layer (HTL), an emission layer (EML), an electron transport layer (ETL), and an electron injection layer Layer, and EIL) may be sequentially stacked.

The color improving film of the present invention exhibits less change in color tone depending on the viewing angle, is excellent in light transmittance, light diffusing property and reliability, and its manufacturing method is excellent in processability and economical efficiency.

FIG. 1 is a cross-sectional view of a color improving film according to an embodiment of the present invention.
2 is a perspective view of a high-refraction resin layer in which an optical pattern is formed according to an embodiment of the present invention.
3 (a) is a perspective view of an optical pattern in which a distance between adjacent lenticular lenses is present, and FIG. 3 (b) is a cross-sectional view of the color improving film.
4 is a cross-sectional view of a color improving film according to another embodiment of the present invention.
5 is a graph showing the values of? U'V 'according to viewing angles of the color improving films of Examples and Comparative Examples.
6 is a schematic view of an OLED display device according to an embodiment of the present invention.
FIG. 7A is a conceptual view for explaining a resonance structure, and FIG. 7B is a graph showing a distribution of transmittance according to a light wavelength.

Hereinafter, embodiments of the color improving film according to the present invention will be described with reference to the accompanying drawings.

In this process, the thicknesses of the lines and the sizes of the components shown in the drawings may be exaggerated for clarity and convenience of explanation.

In addition, the terms described below are terms defined in consideration of the functions of the present invention, which may vary depending on the intention or custom of the user, the operator.

Therefore, definitions of these terms should be made based on the contents throughout this specification.

Hereinafter, the color improving film of the present invention will be described with reference to the drawings.

Color improvement film

FIG. 1 is a cross-sectional view of a color improving film according to an embodiment of the present invention. 1, the color improving film includes a base layer 100; A high-refraction resin layer 110 on which an optical pattern is formed; A low refractive light diffusing layer 120 including a light diffusing agent 121; And a high refractive index resin layer opposed to the low refractive index light diffusion layer.

The base layer 100 is preferably a transparent resin film or a glass substrate having ultraviolet transmittance and having a light incidence surface and a light emergence surface opposed to the light incidence surface. As the material, TAC (TriAcetate Cellulose), PolyEthylene Terephthalate (PET), polycarbonate (PC), polyvinyl chloride (PVC), or the like can be used.

The thickness of the base layer may be 30 to 100 mu m.

The high-refraction resin layer 110 on which the optical pattern is formed includes a high-refraction resin layer and an optical pattern formed on one surface of the high-refraction resin layer. The high refractive index resin layer may be formed of an ultraviolet ray curable transparent resin having a refractive index of 1.50 to 1.60.

The optical pattern may be formed at an obtuse angle on one side of the high refractive index resin layer 110 opposite to the low refractive index light diffusion layer 120. The recessed optical pattern may be at least one selected from the group consisting of a microlens, a cone, a cone, a cylinder lens, a prism, and a round prism, but is not limited thereto. However, light having a high color purity among lights incident on the panel may be emitted in a direction perpendicular to the light exit surface, and it is preferable to use a micro-concave lens to diffuse incident light having a high color purity more widely. The micro-concave lens may be at least one of a semicircular cross-section lenticular lens, a semicircular cross-sectional dot lens, a semicircular cross-sectional stripe lens, and a semicircular cross-sectional wavy lens, but may be a semicircular cross-sectional lenticular lens.

2 is a perspective view of a high-refraction resin layer in which an optical pattern is formed according to an embodiment of the present invention, in which an optical pattern composed of a plurality of lenticular concave lenses 111 is applied. 2, a lenticular concave lens 111 is formed at an oblique angle on one surface of the high refractive index resin layer 110. The lenticular concave lens 111 has a hemispherical cross sectional shape with a width D and a depth H . The width (D) of the lenticular concave lens may be 1 to 1,000 μm, and the depth (H) may be 1 to 2,000 μm. Further, in the present invention, when the aspect ratio of the lenticular concave lens is defined as H (lens depth) / D (lens width), the lenticular concave lens of the present invention has an aspect ratio of 1 to 3, It can have an aspect ratio of 2.5. The thickness of the high refractive index resin layer 110 may be 5 to 80 탆.

Since the space occupied by the lenticular concave lens in the color improving film is filled with air and the refractive index of air is 1, the refractive index difference with the high refractive index resin layer is increased without using the low refractive index transparent resin, It is possible to increase the process efficiency since a separate filling process is not required.

Fig. 3 (a) is a perspective view of an optical pattern pattern in which a distance between adjacent lenticular lenses is present, and Fig. 3 (b) is a cross-sectional view of the color improving film. Referring to FIG. 3 (a), the optical pattern may include a plurality of lenticular concave lenses 133 with a predetermined distance L between adjacent lenticular concave lenses 111. The ratio (L / D) of the spacing distance L to the width D of the lenticular concave lens may be 3.0 or less, and preferably 1.0 to 2.0. In this range, the color change improvement effect according to the viewing angle can be maximized.

In order to obtain a color improvement effect, it is advantageous to use a lens having a high aspect ratio, but a problem may arise in a process in which bite processing and roll processing using such bite are not easy, It is not economical because of. The present invention can realize an excellent color improvement effect even by using an optical pattern having a relatively low aspect ratio by introducing a low refractive light diffusion layer.

The low refractive index light diffusing layer 120 is laminated on the surface of the high refractive index resin layer 110 on which the optical pattern is formed and can be formed of a light diffusing agent and an ultraviolet ray curable transparent resin having a refractive index of 1.35 to 1.45.

The light diffusing agent 121 included in the low refractive light diffusing layer 120 may use an organic light diffusing agent or an inorganic light diffusing agent and may be used by mixing them for diffusibility and transparency. The organic light-diffusing agent may be acrylic particles, siloxane particles, melamine particles, polycarbonate particles, styrene particles or the like, either alone or in combination. The organic light-diffusing agent may be spherical crosslinked fine particles having an average particle diameter (D50) of 2 to 20 mu m. The inorganic light-diffusing agent may be added to prevent the decrease in whiteness of the final resin composition, which is generated when the spherical organic light-diffusing agent is added, and to increase light diffusibility. In this case, as the amount of the inorganic light-diffusing agent is increased, the processability is lowered, so an appropriate amount should be added. For example, the inorganic light-diffusing agent may be calcium carbonate, barium sulfate, titanium dioxide, aluminum hydroxide, silica, glass, talc, mica, white carbon, magnesium oxide, zinc oxide, .

In one embodiment, the organic light-diffusing agent may comprise polymer particles coated with a black dye. However, since the use of the polymer particles coated with the black dye alone may lower the light transmittance and cause a decrease in brightness, the uncoated particles may further include silicon particles, acrylic particles, or a mixture thereof, and may be coated with a black dye By using the polymer particles and the uncoated polymer particles in an appropriate amount, it is possible to control the color difference change, the contrast ratio, the reflection color, etc. according to the luminance and the viewing angle. Preferably, polymethylmethacrylate (PMMA) particles coated with a black dye; And a light diffusing agent containing silicon particles, acrylic particles or a mixture thereof as a non-coated polymer particle in a weight ratio of 1: 4 to 4: 1.

In particular, in the case where the optical pattern is a lenticular concave lens pattern, the color improvement in the left and right direction of the panel can be achieved by itself, but the color improvement in the up and down direction is satisfactory because of the shape of the vertically arranged lenticular lens I can not. When the light diffusing agent of the present invention is applied, it is possible to improve the color in the vertical direction as well as in the lateral direction.

In the present invention, the light diffusing agent may be contained in an amount of 0.1 to 10 wt% of the low refractive light diffusing layer.

The low refractive index light diffusion layer not only improves the diffusing property and color improvement effect of light but also can improve the adhesive force with the adhesive layer which is further laminated, and can ultimately improve the reliability of the display panel. In the absence of the low refractive index light diffusion layer, only the surface area of the entire surface of the high refractive index resin layer on which the optical pattern is formed, except for the occupied area of the optical pattern formed at the depressed portion, is subject to adhesion, And the peeling can occur.

The base resin used in the high refractive index resin layer 110 and the low refractive index light diffusion layer 120 may be an ultraviolet curable transparent resin as a transparent polymer resin.

Examples of the ultraviolet ray-curable transparent resin include resins having acrylate-based functional groups such as polyester resins, polyether resins, acrylic resins, epoxy resins, urethane resins, alkyd resins, spiro acetal resins, polybutadiene resins , A polythiol polyene resin, a polyfunctional compound such as a polyhydric alcohol, and the like can be used.

Specific examples thereof include ethylene glycol diacrylate, neopentyl glycol di (meth) acrylate, 1,6-hexanediol (meth) acrylate, trimethylolpropane tri (meth) acrylate, dipentaerythritol hexa (Meth) acrylate obtained by esterifying a di (meth) acrylate of a polyol poly (meth) acrylate, a bisphenol A-diglycidyl ether, a polyhydric alcohol and a polycarboxylic acid and an anhydride thereof with acrylic acid, (Meth) acrylate, pentaerythritol tetramethacrylate, glycerin trimethacrylate, and the like, but are not limited thereto.

Referring to FIG. 4, the adhesive layer 130 may be further laminated on the light incident surface of the low refractive index light diffusion layer. In the color improving film of the present invention, the incident light can proceed in the order of the adhesive layer, the light-diffusing layer, the high-refraction resin layer, and the substrate layer. The pressure-sensitive adhesive layer may be formed of a conventional pressure-sensitive adhesive.

The color improving film of the present invention has the above-described structural features, so that the change in white color dependency (WAD) according to the viewing angle is small, and the white color depending on the viewing angle can be uniformly expressed accordingly.

Method for producing color improvement film

According to an embodiment of the present invention, there is provided a method of manufacturing a color improving film, comprising: preparing a high refractive index resin layer by applying a high refractive index transparent resin to one surface of a substrate layer, Dispersing a light diffusing agent in a low refractive transparent resin to produce a low refractive light diffusing layer; And bonding one surface of the low refractive index light diffusion layer to a surface of the high refractive index resin layer on which an optical pattern is formed.

According to another embodiment of the present invention, the method may further include forming a pressure-sensitive adhesive layer on the other surface of the light diffusion layer.

The transparent resin may be an ultraviolet curable transparent resin. The high refractive index transparent resin may have a refractive index of 1.50 to 1.60, and the low refractive index transparent resin may have a refractive index of 1.35 to 1.45.

The high refractive index resin layer is formed by applying a high refractive index transparent resin to one surface of a substrate layer and then forming an optical pattern of an engraved pattern using a soft mold method using a hard mold using a pulling roll having an optical pattern formed in a positive angle or a film can do.

The low refractive index light diffusion layer sufficiently disperses the light diffusion agent in the low refractive index ultraviolet ray curable transparent resin and then joins the surface of the high refractive index resin layer on which the optical pattern is formed using a flat roll to form a light diffusion layer of the color improvement film .

The low refraction light diffusion layer may preferably be 10 to 30 占 퐉 except for the thickness of the lens portion. When the thickness is less than 10 탆, the surface may be roughened due to the size of the dispersing agent, so that the adhesive strength and light diffusibility are sufficient Can not be secured.

The organic light emitting diode display device

6 is a schematic view of an OLED display device according to an embodiment of the present invention. 6, the OLED display includes a first electrode 210, a second electrode 220 facing the first electrode 210, a first electrode 210 and a second electrode 220, An organic light emitting layer 230 formed between the first electrode 230 and the second electrode 230; And a color enhancement film 240 provided on the light exit surface of the second electrode 220.

The first electrode 210 is an anode and the second electrode 220 is a cathode and the first electrode 210 and the second electrode 220 may include a transparent electrode or a reflective electrode. have.

The organic light emitting layer 230 may include a hole injection layer (HIL), a hole transport layer (HTL), an emission layer (EML), an electron transport layer (ETL) (Electron Injection Layer, EIL) may be sequentially stacked.

The organic light emitting diode display device may have a resonant structure so as to realize an image with a color reflected from each pixel of the organic light emitting layer.

7 (a) is a conceptual diagram schematically showing a resonance structure of an organic light emitting diode display device. Referring to FIG. 6 again, the structure surrounded by the first electrode and the second electrode can be defined as a cavity. Light emitted from the emission layer (EML) Reflection occurs repeatedly in the cavity between the second electrode (d) and the reflection, and the emission intensity of the specific wavelength region can be amplified as shown in FIG. 7 (b). In FIG. 7 (b), the strong resonance structure has a narrower light wavelength region in which light is emitted, a larger front emission intensity, and a narrower light emission direction than a weakly resonant structure. That is, although the color purity and front luminance are high, the viewing angle becomes narrow. Accordingly, a color shift phenomenon may occur in which the display that appears white on the front surface becomes blue as the viewing angle increases. This color change can be defined as White Angle Dependency (WAD), and the color improvement film described above is introduced to adjust the color change.

Hereinafter, the configuration and operation of the present invention will be described in more detail with reference to preferred embodiments of the present invention. It is to be understood, however, that the same is by way of illustration and example only and is not to be construed in a limiting sense.

The contents not described here are sufficiently technically inferior to those skilled in the art, and a description thereof will be omitted.

Example

Example 1

The color enhancement films in which each of the following layers were sequentially laminated was prepared and physical properties were evaluated. The properties are shown in Table 1 below, and the value of U'V 'according to the viewing angle is shown in the graph of FIG.

Base layer: TAC film of Fuji Film Co., Ltd. was used, and its thickness was 60 탆.

High refractive index resin layer formed with optical pattern: An optical pattern was formed on a surface of a high refractive index resin layer made of an ultraviolet ray curable transparent acrylic resin (Aekyung Chemical Co., Ltd., RS1400) at an engraved angle. The refractive index of the high refractive index resin layer is 1.52, the thickness is 50 占 퐉, the optical pattern is composed of a plurality of lenticular concave lenses, the width of the lenticular concave lens is 10 占 퐉, the depth is 20 占 퐉, and the aspect ratio is 2.0. The space occupied by the concave lens is filled with air.

Low refraction light diffusion layer:

Curable transparent acrylic resin (Shin-A T & C, SSC-3802, refractive index 1.39) containing a light diffusing agent. The refractive index is 1.39 and the thickness is 30 탆. The light-diffusing agent (Cheil Industries, SL-200, average particle size (D50) 2 m) was used in an amount of 3% by weight in the low refractive light diffusing layer.

Example 2

The same color-improving films as in Example 1 were prepared except that the content of the light-diffusing agent was 5% by weight, and physical properties were measured and shown in Table 1 below.

Comparative Example 1

The same color-improving films as in Example 1 were prepared, except that the low refractive-index light-diffusing layer did not contain a light diffusing agent, and the physical properties thereof were measured.

Property evaluation method

Light transmittance (%) and light scattering property (%): The produced film was cut into a size of 5 cm * 5 cm and measured with NDH5000W (Nippon Denshoku) according to ASTM D1003.

Color Change Ratio (DELTA U'V '): The films of the examples and comparative examples were cut into a size of 20 cm * 20 cm and then attached to an OLED TV panel using a measuring device EZcontrast (Eldim) Deg.] To obtain spectra. The color change rate? U'V 'was calculated from the measured results, and the? U'V' value according to the viewing angle was plotted in the graph of FIG. Bare panel state with no film attached.

Evaluation of adhesion: The films of the examples and comparative examples were cut into a size of 5 inch * 1 inch, and then the force necessary for pulling and peeling in the 180 ° direction was measured using a measuring instrument 5944 (Instron).

Example 1 Example 2 Comparative Example 1 oyster
section
Rate High refractive index resin layer 1.52 1.52 1.52 The low refractive- 1.39 1.39 1.39 Concave Lens Aspect Ratio (D / H) 2.0 2.0 2.0 Light diffusing agent (% by weight) 3 5 - Light transmittance (%) 86.45 88.06 92.65 Light scattering (%) 45.78 54.84 36.99
△ U'V ' 0 ° 0 0 0 20 ° 0.004 0.004 0.007 40 ° 0.017 0.013 0.022 60 ° 0.023 0.017 0.028 Adhesion (gf / in) 129.5 118.2 39.8

Referring to Table 1 and FIG. 5, it can be seen that the light scattering properties of Examples 1 and 2 were further improved by the addition of the light diffusing agent than that of Comparative Example 1. In addition, it can be seen that the value of? U'V 'according to the viewing angle is lowered and the color improving effect is obtained.

In addition, the adhesive strength of Example 1-2 is remarkably superior to that of Comparative Example 1, so that the peeling phenomenon with the panel due to the improvement of the adhesive force with the adhesive layer can be prevented, and the reliability of the display panel can be improved.

Claims (19)

A base layer;
A high-refraction resin layer in which an optical pattern is formed; And
A low refractive light diffusing layer including a light diffusing agent; Are sequentially stacked,
Wherein an optical pattern is formed on one surface of the high refractive index resin layer opposite to the low refractive index light diffusion layer at a negative angle.
The method according to claim 1,
Wherein the high refractive index resin layer comprises an ultraviolet ray curable transparent resin having a refractive index of 1.50 to 1.60.
The method according to claim 1,
Wherein the low refractive index light-diffusing layer comprises an ultraviolet-curable transparent resin having a refractive index of 1.35 to 1.45.
The method according to claim 1,
Wherein the optical pattern is composed of a plurality of lenticular concave lenses and the lenticular concave lens has a width D of 1 to 1,000 占 퐉, a depth H of 1 to 2,000 占 퐉, an aspect ratio H / D of 1 ≪ / RTI > to < RTI ID = 0.0 > 3.
5. The method of claim 4,
The optical pattern has a distance L between adjacent lenticular lenses,
Wherein a ratio (L / D) of the spacing distance (L) to a width (D) of the lenticular concave lens is 3.0 or less.
The method of claim 1,
Wherein the high refractive index resin layer and the low refractive index resin layer are ultraviolet curable resins having an acrylate functional group.
The method according to claim 1,
Wherein the light diffusing agent is an organic light-diffusing agent, an inorganic light-diffusing agent, or a mixture thereof,
The organic light-diffusing agent includes at least one member selected from the group consisting of acrylic particles, siloxane particles, melamine particles, polycarbonate particles, and styrene particles,
Wherein the inorganic light-diffusing agent comprises at least one selected from the group consisting of calcium carbonate, barium sulfate, titanium dioxide, aluminum hydroxide, silica, glass, talc, mica, white carbon, magnesium oxide, Color improvement film.
8. The method of claim 7,
Wherein the organic light-diffusing agent has an average particle diameter (D50) of 2 to 20 占 퐉.
9. The method of claim 8,
Wherein the organic light diffusing agent comprises polymer particles coated with a black dye and uncoated particles,
The polymer particles coated with the black dye are polymethyl methacrylate (PMMA) particles,
Wherein the uncoated particles are a silicone-based particle, an acrylic-based particle, or a mixture thereof.
10. The method of claim 9,
Wherein the organic light diffusing agent comprises polymer particles coated with the black dye and uncoated particles at a weight ratio of 1: 4 to 4: 1.
The method according to claim 1,
Wherein the light diffusing agent comprises 0.1 to 10% by weight of the light diffusing layer.
The method according to claim 1,
The thickness of the base layer is 30 to 100 탆,
The maximum thickness of the high refractive index resin layer is 5 to 80 탆,
Wherein the thickness of the low refraction light diffusion layer is 5 to 50 占 퐉.
The method according to claim 1,
And a pressure-sensitive adhesive layer is further laminated on one surface of the low refractive index light-diffusing layer.
The method according to claim 1,
Wherein the base layer includes a triacetate cellulose (TAC), a polyethylene terephthalate (PET), a polycarbonate (PC), or a polyvinyl chloride (PVC).
A first electrode, a second electrode facing the first electrode, and an organic light-emitting film formed between the first electrode and the second electrode; And a color improving film according to any one of claims 1 to 14 provided on a light exit surface of the second electrode,
Wherein the organic light emitting layer has a resonance structure to realize an image with a hue reflected from each pixel of the organic light emitting layer.
16. The method of claim 15,
The organic light emitting layer may include a hole injection layer (HIL), a hole transport layer (HTL), an emission layer (EML), an electron transport layer (ETL), and an electron injection layer Layer, and EIL) are sequentially stacked on the substrate.
Forming a high refractive index resin layer by applying a high refractive index transparent resin to one side of the base layer and then forming an optical pattern of a negative angle; Dispersing a light diffusing agent in a low refractive transparent resin to produce a low refractive light diffusing layer; And bonding one surface of the low refractive index light diffusion layer to a surface of the high refractive index resin layer on which the optical pattern is formed.
18. The method of claim 17,
Further comprising the step of applying a pressure-sensitive adhesive on the other surface of the light-diffusing layer to form a pressure-sensitive adhesive layer.
18. The method of claim 17,
The high refractive index transparent resin is an ultraviolet ray curable transparent resin having a refractive index of 1.50 to 1.60,
Wherein the low refractive index transparent resin is an ultraviolet ray curable transparent resin having a refractive index of 1.35 to 1.45.

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