KR102067161B1 - Film for improving color sense and method for preparing the same - Google Patents

Abstract

The present invention is a substrate layer; A high refractive light diffusing layer comprising a light diffusing agent; High refractive resin layer; And a low refractive resin layer having an optical pattern formed thereon, and a color improving film having an optical pattern formed on one surface of the low refractive resin layer facing the high refractive resin layer, and the method of manufacturing the color improving film described above. Applying a resin containing a diffusing agent to one surface of the layer and curing the resin to form a high refractive light diffusing layer; Forming a high refractive resin layer in which a plurality of optical patterns are engraved on one surface of the high refractive light diffusing layer; And forming a low refractive resin layer having an optical pattern formed on one surface by applying a low refractive transparent resin to the surface of the high refractive resin layer in which the optical pattern is intaglio, and curing the resin. There is little change in color, and excellent light transmittance and light diffusion, the manufacturing method is excellent in fairness and economics.

Description

Color improving film and its manufacturing method {FILM FOR IMPROVING COLOR SENSE AND METHOD FOR PREPARING THE SAME}

The present invention relates to a color improving film and a method of manufacturing the same, and more particularly, to a color improving film having a small color change according to a viewing angle and a method of manufacturing the same.

The liquid crystal light emitting device displays a color and an image by arranging a panel in which a regular array of liquid crystals forming a screen is placed in a flat tempered glass, and a back light behind the panel emits light. More specifically, the light emitted from the backlight passes through numerous liquid crystals and is refracted in various patterns, and then the light passes through a filter located in front of the liquid crystal to form pixels of different colors and brightness (full pixels). Configure The liquid crystal light emitting device has excellent image quality and low production cost, but has been continuously pointed out as disadvantages due to the complexity of the process, slow response speed, narrow viewing angle, and high power consumption.

Organic light-emitting device display has been in the spotlight as a next-generation display that compensates for the disadvantages of liquid crystal displays (LCDs). The organic light emitting device implements color by using R, G, and B characteristics according to organic materials by using light emission characteristics that emit light when a current flows through the fluorescent organic compound. Its high resolution, wide viewing angle, and low power drive make it possible to express a natural image without remaining afterimages due to its fast response speed. Therefore, it is widely used in general digital TV as well as portable devices. However, an organic light emitting display such as an OLED TV may change color depending on the viewing angle.

Korean Patent Laid-Open No. 2012-0081362 discloses a plurality of intaglio lens portions formed in a spaced apart space from each other and a background layer constituting a layer to improve color change according to a viewing angle of a liquid crystal display. It is characterized in that the filling portion and the background and the filling portion has a different refractive index, but this prior art requires that the aspect ratio of the lens is quite large in order to obtain a color improvement effect, bite processing and roll processing using such bite is easy The reality is that if the mass production is taken into consideration, the cost of production will inevitably rise due to the sudden drop in yield. In addition, the difference in refractive index between the two resins should be maximized for sufficient color improvement. High refractive resins have a problem with adhesion to the film during processing using rolls, and low refractive resins are not cured at high cost due to manufacturing difficulties and during the manufacturing process. There is a problem.

Therefore, there is an urgent need to develop an optical film for an organic light emitting display device which has excellent fairness and economical efficiency and little color change depending on the viewing angle.

An object of the present invention is to provide a color improving film with less change in color depending on the viewing angle.

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

Still another object of the present invention is to provide a method for producing a color improving film having excellent processability and economy.

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

One aspect of the invention is a substrate layer; A high refractive light diffusing layer comprising a light diffusing agent; High refractive resin layer; And a low refractive resin layer having an optical pattern formed thereon, and a color improving film having an optical pattern formed on one surface of the low refractive resin layer facing the high refractive resin layer.

The high refractive light diffusion layer and the high refractive resin layer may include an ultraviolet curable transparent resin having a refractive index of 1.50 to 1.60.

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

The optical pattern and the low refractive resin layer may be integrally formed.

The high refractive light diffusing layer and the high refractive resin layer including the light diffusing agent may be integrally formed.

The optical pattern includes a plurality of lenticular lenses, the lenticular lens having a width D of 1 to 1,000 µm, a height H of 1 to 2,000 µm, and an aspect ratio H / D of 0.2 to 3.0. The color improvement film characterized by the above-mentioned.

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

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

The light diffusing agent is an organic light diffusing agent, an inorganic light diffusing agent, or a mixture thereof, and the organic light diffusing agent is selected from the group consisting of acrylic particles, siloxane particles, melamine particles, polycarbonate particles, and styrene particles. At least one selected from the group, the inorganic light diffusing agent 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 It may contain the above.

The organic light diffusing agent may have a particle size of 1 μm to 20 μm.

The organic light diffusing agent includes polymer particles coated with black dye and uncoated particles, the polymer particles coated with black dye are polymethylmethacrylate (PMMA) particles, and the uncoated particles are silicon-based particles. , Acrylic particles or mixtures thereof.

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

The light diffusing agent may be included in 0.1 to 10% by weight of the light diffusing layer.

The base layer has a thickness of 30 to 100 μm, the high refractive light diffusing layer has a thickness of 5 to 60 μm, the maximum thickness of the high refractive resin layer is 5 to 80 μm, and the low refractive resin layer has a thickness of 5 to 50 μm. May be μm.

An adhesive layer may be further laminated on the other surface of the low refractive resin layer.

The base layer may include TAC (TriAcetate Cellulose), polyethylene terephthalate (PET), polycarbonate (PolyCarbonate, PC), or polyvinyl chloride (PVC).

Another aspect of the invention is a step of forming a high refractive light diffusion layer by applying a resin containing a diffusing agent on one surface of the substrate layer and then cured; Forming a high refractive resin layer in which a plurality of optical patterns are engraved on one surface of the high refractive light diffusing layer; And forming a low refractive resin layer having an optical pattern formed on one surface thereof by applying a low refractive transparent resin to the surface of the high refractive resin layer on which the optical pattern is engraved and then hardening. .

The method may further include forming an adhesive layer by applying an adhesive to the other surface of the low refractive resin layer.

Still another aspect of the present invention provides a display device comprising: an organic light emitting film formed between a first electrode, a second electrode facing the first electrode, and the first electrode and the second electrode; And a color improving film according to any one of claims 1 to 16, which is provided on the light exit surface of the second electrode, and includes an organic light emitting device having a resonance structure to implement an image with colors reflected from each pixel of the organic light emitting film. It relates to a display device.

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

The color improvement film of this invention has little color change according to a viewing angle, is excellent in light transmittance and light diffusivity, and its manufacturing method is excellent in fairness and economics.

1 shows a cross-sectional view of a color improving film according to an embodiment of the present invention.
2 is a perspective view of a low refractive resin layer in which a lenticular lens pattern is formed as an optical pattern according to an exemplary embodiment of the present invention.
3 (a) is a perspective view of a low refractive resin layer in which a lenticular lens pattern is formed with a separation distance between neighboring lenticular lenses, and FIGS. 3 (b) and 3 (c) are cross-sectional views of a color improving film including the same. Each shown
Figure 4 shows a cross-sectional view of a color improving film according to another embodiment of the present invention.
Figure 5 shows a cross-sectional view of a color improving film according to another embodiment of the present invention.
It is a graph which shows the value of (DELTA) U'V 'according to the viewing angle of the color improving film of an Example and a comparative example.
7 schematically illustrates an organic light emitting diode display device according to an embodiment of the present invention.
FIG. 8A is a conceptual diagram illustrating a resonance structure, and FIG. 8B is a graph showing a distribution of transmittances according to light wavelengths.

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 thickness of the lines or the size of the components shown in the drawings may be exaggerated for clarity and convenience of description.

In addition, terms to be described later are terms defined in consideration of functions in the present invention, which may vary according to a user's or operator's intention or custom.

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

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

Color improvement film

1 shows a cross-sectional view of a color improving film according to a first embodiment of the present invention. Referring to FIG. 1, the color improving film includes a base layer 100; A high refractive light diffusing layer 110 comprising a light diffusing agent; High refractive resin layer 120; And a low refractive resin layer 130 having an optical pattern formed thereon, and having an optical pattern formed on one surface of the low refractive resin layer facing the high refractive resin layer.

The base layer 100 is preferably a transparent resin film or glass substrate having ultraviolet light transmission having a light incidence surface and a light emission surface opposite to the light incidence surface. The material may be TAC (TriAcetate Cellulose), polyethylene terephthalate (PET), polycarbonate (PolyCarbonate, PC), polyvinyl chloride (PVC), or the like, and may be a single layer or multiple layers.

The substrate layer may have a thickness of 30 μm to 100 μm.

The high refractive light diffusing layer 110 may be laminated on the light incident surface of the base layer 100 and may be formed of a light diffusing agent 111 and an ultraviolet curable transparent resin having a refractive index of 1.50 to 1.60. The high refractive light diffusing layer may have a thickness of 5 to 60 μm.

As the light diffusing agent 111 included in the high refractive light diffusing layer, an organic light diffusing agent or an inorganic light diffusing agent may be used, and these may be mixed and used for diffusing and transmissive properties. The organic light diffusing agent may be used alone or mixed with acrylic particles, siloxane particles, melamine particles, polycarbonate particles, styrene particles and the like. The organic light diffusing agent may be spherical crosslinked fine particles having an average particle diameter of 1 to 20 μm. The inorganic light diffusing agent may be added to prevent a decrease in whiteness of the final resin composition generated when adding the spherical organic light diffusing agent and to increase light diffusivity. In this case, since the fairness decreases as the amount of the inorganic light diffusing agent increases, an appropriate amount should be added. As an 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, and the like, but is not limited thereto. .

The organic light diffusing agent may have a particle size of 1 to 20 μm, preferably 1 to 10 μm, more preferably 2 to 5 μm.

In one embodiment, the organic light diffusing agent may include 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. The mixed polymer particles and the uncoated polymer particles may be mixed in an appropriate amount to adjust brightness, color difference according to viewing angle, contrast ratio, and reflection color. Preferably, the light diffusion includes polymethyl methacrylate (PMMA) particles coated with a black dye, and silicon particles, acrylic particles or mixtures thereof as uncoated polymer particles in a weight ratio of 1: 4 to 4: 1. You can use the agent.

In particular, when the optical pattern is a lenticular lens pattern, color improvement in the left and right directions of the panel may be performed by itself, but color improvement in the vertical direction may be satisfactory due to the shape of the lenticular lenses arranged vertically. none. In the case of applying the light diffusing agent of the present invention, color improvement in the vertical direction is possible with color improvement in the left and right directions.

In the present invention, the light diffusing agent may be included in 0.1 to 10% by weight of the high refractive light diffusing layer.

The high refractive resin layer 120 may be formed between the high refractive light diffusing layer 110 and the low refractive resin layer 130 having an optical pattern positioned to face the high refractive light diffusing layer. The high refractive resin layer may be formed of an ultraviolet curable transparent resin having a refractive index of 1.50 to 1.60. In the high refractive resin layer, the optical pattern formed on the low refractive resin layer may penetrate into the high refractive resin layer, and thus the layer thickness may not be constant. The maximum thickness of the high refractive resin layer may be 5 to 80㎛.

Referring to FIG. 1, the high refractive light diffusing layer 110 and the high refractive resin layer 120 including the light diffusing agent 111 may be separately prepared, but the high refractive light diffusing layer and the high refractive resin layer are integrally formed as shown in FIG. 5. May be formed to form one layer 160.

The low refractive resin layer 130 having the optical pattern includes a low refractive resin layer and a plurality of optical patterns formed on one surface of the low refractive resin layer. The optical pattern 133 may be formed on one surface of the low refractive resin layer 131 facing the high refractive resin layer 120.

The low refractive resin layer and the optical pattern may be integrally formed by the same material without adhesion by an adhesive. The optical pattern and the low refractive resin layer may be formed of an ultraviolet curable transparent resin having a refractive index of 1.35 to 1.45, and the optical pattern and the low refractive resin layer may be integrally formed.

The optical pattern may have one or more types selected from the group consisting of cones, cone frames, micro lenses, cylinder lenses, prisms, and round prisms, but is not necessarily limited thereto. However, light having high color purity among the light incident on the panel may be emitted in a direction perpendicular to the light exit surface. In order to diffuse the light having high color purity more widely, it is preferable to use a micro lens. The shape of the microlenses may be any one of a semicircular cross-sectional lenticular pattern, a semicircular cross-sectional dot pattern, a semicircular cross-sectional stripe pattern, and a semicircular cross-sectional wave pattern, but is not limited thereto.

2 is a perspective view of a low refractive resin layer in which an optical pattern is formed according to an embodiment of the present invention, in which a semi-circular cross-sectional lenticular pattern is applied as an optical pattern. 2, a plurality of lenticular lenses 133 are integrally formed on one surface of the low refractive resin layer 131, and the lenticular lenses 133 have a width D of 1 μm to 1,000 μm, The height H may be 1 μm to 2,000 μm, and the aspect ratio H / D may be 0.2 to 3.0, preferably 0.3 to 1. The thickness of the low refractive resin layer 131 except for the optical pattern is 5 to 50 μm.

It is advantageous to use a lens with a high aspect ratio to achieve the color improvement effect, but there may be a problem in the process that is not easy to process the bite and roll using the bite, economical due to the sharp decrease in yield when considering mass production Not According to the present invention, an excellent color improvement effect can be realized even by using an optical pattern having a relatively low aspect ratio by introducing a high refractive light diffusing layer.

3 (a) is a perspective view of a lenticular lens pattern according to a second embodiment of the present invention. Referring to FIG. 3A, in the lenticular lens pattern according to another embodiment of the present invention, a plurality of lenticular lenses 133 may be arranged at a predetermined distance L between neighboring lenticular lenses 133. The ratio L / D of the separation distance L and the width D of the lenticular lens may be 3.0 or less, and preferably 1.0 to 2.0. Color change improvement effect according to the viewing angle in the above range can be maximized.

Figure 3 (b) is a cross-sectional view of a color improving film formed with a lenticular lens pattern according to another embodiment of the present invention Figure 3 (c) is a cross-sectional view of a color improving film formed integrally with a high refractive light diffusing layer and a high refractive resin layer, respectively It is.

Referring to FIG. 3 (c), the color improving film having the lenticular lens pattern formed may be a color improving film in which a high refractive light diffusing layer and a high refractive resin layer are formed as one layer 150.

The base resin used in the high refractive light diffusing layer 110, the high refractive resin layer 120, and the low refractive resin layer 130 having the optical pattern formed thereon may be an ultraviolet curable transparent resin as the transparent polymer resin.

As the ultraviolet curable transparent resin, those having an acrylate-based functional group, for example, a relatively small molecular weight polyester resin, polyether resin, acrylic resin, epoxy resin, urethane resin, alkyd resin, spiro acetal resin, polybutadiene resin And (meth) acrylate resins of polyfunctional compounds such as polythiol polyene resins and polyhydric alcohols.

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 Polyester (meth) acryl obtained by esterifying polyol poly (meth) acrylate, di (meth) acrylate of bisphenol A- diglycidyl ether, polyhydric alcohol and polyhydric carboxylic acid, and its anhydride and acrylic acid Latex, polysiloxane polyacrylate, urethane (meth) acrylate, pentaerythritol tetra methacrylate, glycerin tri methacrylate, and the like, but are not limited thereto.

As another embodiment of the present invention, referring to FIG. 4, an adhesive layer 140 may be further stacked on the other surface of the low refractive resin layer 130. The adhesive layer may be formed of a common adhesive.

Since the color improving film of the present invention has the above-described structural features, there is little change in white angle dependence (WAD) according to the viewing angle, and the whiteness according to the viewing angle can be uniformly expressed.

Manufacturing method of color improving film

Method for producing a color improving film according to an embodiment of the present invention is a base layer; A high refractive light diffusing layer; High refractive resin layer; And a low refractive resin layer having an optical pattern formed thereon, the method comprising: forming a high refractive light diffusing layer by coating and curing a resin containing a diffusing agent on one surface of a base layer; Forming a high refractive resin layer in which a plurality of optical patterns are engraved on one surface of the high refractive light diffusing layer; And forming a low refractive resin layer having an optical pattern formed on one surface thereof by applying a low refractive transparent resin to the surface of the high refractive resin layer on which the optical pattern is intaglio.

As another embodiment of the present invention, the method may further include forming an adhesive layer by applying an adhesive to the other surface of the low refractive resin layer.

Ultraviolet curable transparent resin can be used for the said 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 light diffusing layer may be formed by sufficiently dispersing the light diffusing agent in the high refractive UV curable transparent resin, and then applying the high refractive transparent resin in which the light diffusing agent is dispersed to one surface of the base layer using a flat roll and then curing. The coating thickness may preferably be 20 to 30 μm. If the thickness exceeds 30 μm, the light transmittance may be reduced due to the excessive amount of light scattering due to the excessive amount of the diffusion agent. If the thickness is less than 20 μm, the surface may be roughened due to the size of the diffusion agent. The castle cannot be secured enough.

The high refractive resin layer may be a soft mold method using a hard mold or a film having an optical pattern embossed using an embossing roll having an optical pattern embossed after applying a high refractive transparent resin to one surface of the high refractive light diffusing layer. After the optical pattern is formed, it may be manufactured through a curing process such as ultraviolet irradiation.

OLED display device

7 schematically illustrates an organic light emitting diode display device according to an embodiment of the present invention. Referring to FIG. 7, the organic light emitting diode display device includes a first electrode 210, a second electrode 220 facing the first electrode 210, and a first electrode 210 and a second electrode 220. An organic light emitting film 230 formed therebetween; And a color improving film 240 provided on the light exit surface of the second electrode 220.

The first electrode 210 is an anode, 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 emission layer 230 includes a hole injection layer (HIL), a hole transport layer (HTL), an emission layer (EML), an electron transport layer (ETL), and an electron injection. The layer (Electron Injection Layer, EIL) may be sequentially stacked.

The organic light emitting diode display may have a resonance structure to implement an image with colors reflected from each pixel of the organic light emitting layer.

FIG. 8A is a conceptual diagram illustrating a resonance structure, and FIG. 8B is a graph showing a distribution of transmittances according to light wavelengths. Referring back to FIG. 7, the structure surrounded by the first electrode and the second electrode may be defined as a cavity, and the light emitted from the emission layer (EML) may be the first electrode as shown in FIG. 8 (a). Reflection occurs repeatedly within the cavity between the second electrode and the second electrode, and the light emission intensity of a specific wavelength region may be amplified as shown in FIG. Referring to FIG. 8 (b), it can be seen that the strong resonance structure has a narrower light wavelength region, a larger front emission intensity, and a narrower emission direction than the weak resonance structure. That is, the color purity and the front luminance are increased, but the viewing angle is narrowed. Therefore, a color shift phenomenon may occur in which the display, which was seen in front of white, appears in 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 through the preferred embodiment of the present invention will be described in more detail. However, this is presented as a preferred example of the present invention and in no sense can be construed as limiting the present invention.

Details that are not described herein will be omitted since those skilled in the art can sufficiently infer technically.

Example

Example  One

Each of the following layers were sequentially laminated to prepare a color improving film, and then the physical properties were evaluated, and the results are shown in Table 1 below.

Substrate layer: TAC film of FUJIFILM Corporation was used, and thickness is 60 micrometers.

High refractive light-diffusion layer: It is manufactured from ultraviolet curable transparent acrylic resin (RS1400, Aekyung Chemical Co., Ltd.) containing a light diffusing agent, refractive index is 1.52, and thickness is 30 micrometers. The light diffusing agent used 3% by weight of silicon-based particles (SL-200, Cheil Industries, Inc., 2㎛ average particle diameter (D50)).

High refractive resin layer: It is made of an ultraviolet curable transparent acrylic resin (RS1400, Aekyung Chemical Co., Ltd.), has a refractive index of 1.52 and a maximum thickness of 40 µm.

Low refractive resin layer having an optical pattern: A plurality of hemispherical lenticular lenses are arranged on one surface of a low refractive resin layer made of an ultraviolet curable transparent acrylic resin (SSC-3802, Shin-A T & C Co., Ltd.) having a refractive index of 1.39. The microlenses are integrally formed, and the thickness of the low refractive resin layer is 30 mu m, the diameter of the lenticular lens is 20 mu m, the height is 20 mu m, and the aspect ratio is 1.0.

Example  2

Except that the content of the light diffusing agent is 5% by weight to prepare the same color improving film as in Example 1 and then to measure the physical properties are shown in Table 1 below.

Comparative example  One

The high refractive light diffusing layer does not contain a light diffusing agent, except that the width of the lenticular lens is 20㎛, 20㎛ height, the aspect ratio is 1.0 and after manufacturing the same color improving film as in Example 1 by measuring the physical properties It is shown in Table 1 below.

Comparative example  2

The high refractive light diffusing layer does not contain a light diffusing agent, and the physical properties of the same color improving film as in Example 1 were measured except that the width of the lenticular lens was 20 μm, the height was 24 μm, and the aspect ratio was 1.2. It is shown in Table 1 below.

Property evaluation method

Light transmittance (%) and light scattering property (%): After cutting the prepared film to 5cm * 5cm size, the light is incident on the surface exposed to the outside of the low refractive resin layer, NDH5000W (Nippon according to ASTM D1003 specification) Denshoku Co. Ltd.).

Color change rate (ΔU'V '): The film of Example and Comparative Example was cut into 20cm * 20cm size, and then attached to OLED TV panel by measuring device EZcontrast (Eldim Co., Ltd.). Spectra were measured at 1 ° intervals up to °. The color change rate ΔU'V 'value with respect to the viewing angle 0 ° was calculated using the measured result, and ΔU'V' value according to the viewing angle was shown in the graph of FIG. 4. The film is not attached to the bare panel.

Example 1 Example 2 Comparative Example 1 Comparative Example 2 oyster
section
Rate High refractive light diffusing layer 1.52 1.52 - - High refractive resin layer 1.52 1.52 1.52 1.52 Low refractive resin layer 1.39 1.39 1.39 1.39 Lenticular lens aspect ratio (H / D) 1.0 1.0 1.0 1.2 Light Diffusion Agent (wt%) 3 5 - - Light transmittance (%) 93.53 93.56 94.43 94.53 Light Scattering (%) 73.31 78.10 33.67 32.05
△ U'V ' 0 ° 0 0 0 0 20 ° 0.003 0.002 0.005 0.005 40 ° 0.010 0.009 0.018 0.011 60 ° 0.015 0.012 0.015 0.014

As a result of measuring the physical properties, referring to FIG. 4, when the color improving film is used in both the comparative example and the embodiment, it can be seen that the value of ΔU'V 'is lowered, thereby improving the color compared to the bare panel. Referring to Table 1, Examples 1 and 2 including the light diffusing agent have the same lens aspect ratio, but it can be seen that the ΔU'V 'value is lower than that of Comparative Example 1 which does not include the light diffusing agent.

In addition, in Example 1-2 using the light diffusing agent, since the ΔU'V 'value is equal to or lower than that of Comparative Example 2 using a lenticular lens having a large aspect ratio, a heterogeneous resin having a small refractive index difference can be selected. It is easy to process the lens and has the advantage of excellent production processability.

Claims (21)

Base layer;
A light diffusing layer comprising a light diffusing agent;
A resin layer (hereinafter, referred to as a first resin layer); And
A resin layer (hereinafter referred to as a second resin layer) on which an optical pattern is formed; is sequentially stacked,
The optical pattern is formed on one surface of the second resin layer facing the first resin layer,
The outer surface of the second resin layer is a flat surface,
The refractive index of the said light-diffusion layer and the said 1st resin layer is a color improvement film larger than the refractive index of the said 2nd resin layer.
The method of claim 1,
The light diffusing layer and the first resin layer is a color improving film comprising an ultraviolet curable transparent resin having a refractive index of 1.50 to 1.60.
The method of claim 1,
The second resin layer is a color improving film containing an ultraviolet curable transparent resin having a refractive index of 1.35 to 1.45.
The method of claim 1,
The optical pattern and the second resin layer is integrally formed, characterized in that the color improving film.
The method of claim 1,
The light diffusing layer and the first resin layer containing the light diffusing agent are formed integrally, the color improving film.
The method of claim 1,
The optical pattern is composed of a plurality of lenticular lenses, the lenticular lens has a width (D) of 1 to 1,000㎛, height (H) of 1 to 2,000㎛, aspect ratio (H / D) of 0.2 to 3.0 The color improvement film characterized by the above-mentioned.
The method of claim 6,
The optical pattern has a separation distance L between neighboring lenticular lenses,
The ratio L / D of the separation distance L and the width D of the lenticular lens is 3.0 or less.
In claim 1,
The said 1st resin layer and said 2nd resin layer are ultraviolet curable resin which has an acrylate type functional group, The color improvement film characterized by the above-mentioned.
The method of claim 1,
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 selected from the group consisting of acrylic particles, siloxane particles, melamine particles, polycarbonate particles, and styrene particles,
The inorganic light diffusing agent includes 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. Color improvement film.
The method of claim 9,
The organic light diffusing agent color improving film, characterized in that the particle size of 1㎛ 20㎛.
The method of claim 10,
The organic light diffusing agent includes polymer particles and uncoated particles coated with a black dye,
The polymer particles coated with the black dye are polymethyl methacrylate (PMMA) particles,
The uncoated particles are silicon-based particles, acrylic particles, or a color improving film, characterized in that a mixture thereof.
The method of claim 11,
The organic light diffusing agent is a color improving film, characterized in that it comprises the polymer particles and uncoated particles coated with the black dye in a weight ratio of 1: 4 to 4: 1.
The method of claim 1,
The light diffusing agent is a color improving film, characterized in that contained in 0.1 to 10% by weight of the light diffusion layer.
The method of claim 1,
The base layer has a thickness of 30 to 100 μm,
The thickness of the light diffusion layer is 5 to 60㎛,
The maximum thickness of the first resin layer is 5 to 80㎛,
The thickness of the said 2nd resin layer is 5-50 micrometers, The color improving film characterized by the above-mentioned.
The method of claim 1,
The pressure-sensitive adhesive layer is further laminated on the other surface of the second resin layer, the color improving film.
The method of claim 1,
The base layer is a color improving film comprising TAC (TriAcetate Cellulose), polyethylene terephthalate (PET), polycarbonate (PolyCarbonate, PC), or polyvinyl chloride (PVC).
An organic light emitting film formed between a first electrode, a second electrode facing the first electrode, and the first electrode and the second electrode; And the color improving film of any one of claims 1 to 16 provided on the light exit surface of the second electrode.
An organic light emitting diode display device having a resonance structure to implement an image in a color reflected from each pixel of the organic light emitting film.
The method of claim 17,
The organic emission 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 (Electron Injection). Layer, EIL) is an organic light emitting display device characterized in that the stacking sequentially.
Applying a resin containing a diffusing agent to one surface of the substrate layer and curing the resin to form a light diffusion layer;
Forming a resin layer (hereinafter, a first resin layer) having a plurality of optical patterns engraved on one surface of the light diffusion layer; And
And forming a resin layer (hereinafter referred to as a second resin layer) having an optical pattern formed on one surface thereof by coating a transparent resin on the surface of the first resin layer in which the optical pattern is engraved and then curing the resin.
The second resin layer is formed so that the outer surface is a flat surface,
The refractive index of the said light-diffusion layer and the said 1st resin layer is a manufacturing method of the color improvement film larger than the refractive index of the said 2nd resin layer.
The method of claim 19,
The method of manufacturing a color improving film further comprising the step of forming an adhesive layer by applying an adhesive to the other surface of the second resin layer.
The method of claim 19,
The first resin layer is formed of an ultraviolet curable transparent resin having a refractive index of 1.50 to 1.60,
The said transparent resin apply | coated to the said 1st resin layer surface is a manufacturing method of the color improving film which is UV curable transparent resin whose refractive index is 1.35-1.45.

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