KR101862908B1

KR101862908B1 - Color conversion film and method for preparing the same

Info

Publication number: KR101862908B1
Application number: KR1020150120499A
Authority: KR
Inventors: 신동목; 안병인; 오혜미; 박태성; 박세정
Original assignee: 주식회사 엘지화학
Priority date: 2015-08-26
Filing date: 2015-08-26
Publication date: 2018-05-30
Also published as: KR20170024908A

Abstract

A first color conversion layer including a resin matrix and a phosphor dispersed in the resin matrix and emitting light having a wavelength different from that of the irradiated light when light having a wavelength of 450 nm is irradiated; And at least a portion of the edge portion on at least one side of the first color conversion layer, the resin matrix being dispersed in the resin matrix and emitting light having a wavelength different from that of the irradiated light when irradiated with light having a wavelength of 450 nm To a color conversion film including a second color conversion layer including two or more spaced patterns including phosphors, a backlight unit including the same, and a display device including the same.

Description

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

The present application relates to a color conversion film and a method for producing the same.

With the large-sized TV, high-definition, slimmer, and more sophisticated functions are being performed. High-performance, high-definition OLED TVs still have a problem of price competitiveness, and the market is not yet open. Therefore, efforts to secure similar advantages of OLEDs with LCDs are continuing.

As one of the above efforts, many quantum dot related technologies and prototypes have recently been implemented. However, since the cadmium-based quantum dots have safety problems such as restriction of use, attention is focused on the manufacture of backlights using cadmium-free quantum dots without relative safety issues.

Korean Patent Application Publication No. 2000-0011622

The present application provides a color conversion film, a method for producing the same, and a backlight unit including the color conversion film.

One embodiment of the present application

A first color conversion layer including a resin matrix and a phosphor dispersed in the resin matrix and emitting light having a wavelength different from that of the irradiated light when irradiated with light having a wavelength of 450 nm; And

And a phosphor dispersed in the resin matrix and emitting light having a wavelength different from that of the light irradiated when the light having a wavelength of 450 nm is irradiated, at least a part of the edge portion on at least one side of the first color conversion layer Lt; RTI ID = 0.0 > a < / RTI > second color conversion layer

And a color conversion film.

According to another embodiment of the present application, a transparent film is provided on at least one surface of the first color conversion layer. The transparent film is directly contacted to the first color conversion layer or attached through the adhesive layer.

Another embodiment of the present application provides a backlight unit including the color conversion film.

Another embodiment of the present application provides a display device including a backlight unit including the color conversion film.

According to the embodiments described herein, by further laminating a color conversion layer including two or more spaced patterns on the edge portion of at least one side of the color conversion layer, the color conversion layer It is possible to prevent the phenomenon that the intensity of the red light emitted from the edge portion of the color conversion layer to the front surface is reduced due to the occurrence of light leakage at the edge portion of the color conversion layer due to total internal reflection, This makes it possible to prevent the color of the center and the edge of the screen from becoming uneven when the display such as a TV is driven due to the blue coloring of the edge portion. Particularly, by forming the color conversion layer, which is additionally provided in the edge portion, to include two or more patterns, it is possible to achieve desired optical characteristics by adjusting the shape, size or distribution of the pattern, The effect of concealing the boundary between the non-existent regions can also be expected.

Figures 1 to 4 illustrate cross sections of color conversion films according to embodiments of the present application.
Figures 5 to 8 illustrate top views of color conversion films according to embodiments of the present application.
Figures 9 and 10 illustrate a backlight unit according to embodiments of the present application.
11 and 12 illustrate scattering patterns provided in the light guide plate of the backlight unit according to the embodiments of the present application.
Figures 13 and 14 illustrate a display device according to embodiments of the present application.
Fig. 15 is a schematic view showing light leakage phenomenon at the edge portion due to total internal reflection of the color conversion film. Fig.
16 shows R / G ratios of the color conversion films prepared in Examples and Comparative Examples according to positions.
17 shows the R / B ratios of the color conversion films prepared in Examples and Comparative Examples according to positions.

A color conversion film according to an embodiment of the present application includes a resin matrix and a first color that is dispersed in the resin matrix and includes a phosphor that emits light having a wavelength different from that of the irradiated light when the light having a wavelength of 450 nm is irradiated, Conversion layer; And at least two spaced apart patterns which are provided in at least a part of the edge portion on at least one side of the first color conversion layer and which contain a resin matrix and a phosphor dispersed in the resin matrix and emitting light of a wavelength different from that of the irradiated light, And a second color conversion layer including a second color conversion layer. By forming the edge portion of the color conversion film in the double layer structure in this way, the wavelength of the blue light at the edge portion can be changed to prevent the blue phenomenon of light.

In the present specification, the edge refers to a portion extending from the edge line on one side of the first color conversion layer to a central portion with a constant width. The edge portion does not include the center portion of one surface including the edge portion of the first color conversion layer. According to one example, the edge portion may be arranged to have a width of 10% or less, for example, 5% or less of the width of the first color conversion layer in the direction perpendicular to the perimeter line from the edge line of the first color conversion layer . In this specification, the width of the edge portion of the first color conversion layer can be used to have the same meaning as the width of the second color conversion layer. The width of the second color conversion layer may be constant or may have a different width depending on the position. As a specific example, when the width of the first color conversion layer in one direction is 1215 mm, the second color conversion layer may be formed on the edge portion having a width of 50-60 mm from both side ends.

According to an embodiment of the present invention, the shape of the patterns constituting the second color conversion layer is not particularly limited, and a horizontal cross section in a direction parallel to the surface of the first color conversion layer may be a square, a triangle, Oval, stripe, and the like. In addition, the patterns constituting the second color conversion layer may be selected from various shapes such as a rectangle, a triangle, and the like in a vertical section in a direction perpendicular to the surface of the first color conversion layer. If desired, the rim of the vertical section or the horizontal section may be a straight line, a curved line, or a combination thereof. The shapes of the patterns may be all the same, but there may be two or more patterns having different sizes and shapes as necessary.

The longest length of the horizontal cross section of the patterns constituting the second color conversion layer may be, for example, 5 mm or less, more preferably 3 mm or less. Within the above range, a local color difference can be prevented. The longest length of the horizontal cross-section of the patterns is a diameter when the horizontal cross-section has a dot shape like a circle, and a diagonal line when the horizontal cross-section is a square.

According to one embodiment, the pattern density of the second color conversion layer, which is an area where the patterns are in contact with the first color conversion layer, is preferably in the range of 5% -70% And may have a gradient in which the pattern density of the second color conversion layer gradually decreases from the edge of the first color conversion layer toward the center thereof. The region in which the second color conversion layer pattern is present is a region in which a border line of the surface of the first color conversion layer on which the second color conversion layer is provided and a line of the pattern that is the furthest from the edge line among lines parallel to the edge line It can be partitioned by a line touching the rim. For example, in FIG. 5, the pattern density can be determined by the area of the second color conversion layer in contact with the first color conversion layer among the regions partitioned by the line indicated by the red dotted line from the left edge line of the first color conversion layer. According to one embodiment of the present application, the patterns constituting the second color conversion layer may have a uniform distribution, but may have a non-uniform distribution if necessary.

According to one embodiment of the present application, the patterns have a configuration in which the horizontal area becomes smaller or the number becomes smaller toward the direction from the edge portion to the center portion of the first color conversion layer. Particularly, a gradation in which the horizontal area of each pattern is reduced while keeping the number of patterns can be used.

According to one embodiment, by including the above-mentioned second color conversion layer, a color conversion film is laminated on a light guide plate using a light source including blue light having a maximum wavelength of 445 nm and green light having a maximum wavelength of 535 nm The Wx, Wy deviation or u ', v' deviation measured at intervals of 4 mm on any imaginary straight line on the color conversion film when the emission spectrum is measured by the luminance meter is 0.05 or less and the R / G ratio or R / B ratio deviation May be 0.1 or less. A prism film and / or a brightness enhancement film may be further laminated on the color conversion film as needed for emission spectrum measurement. Wx, Wy deviation, u ', v' deviation, R / G ratio, and R / B ratio deviation are not influenced by the lamination of the prism film and the brightness enhancement film. R / G or R / B ratio is calculated by calculating the ratio based on max intensity of each color.

According to one embodiment of the present application, when one surface of the first color conversion layer is a quadrangle, the second color conversion layer has an edge portion on one side of one side of the first color conversion layer, It may be provided at the edge portion of three sides or the edge portion of four sides. FIG. 1 and FIG. 2 illustrate a cross-sectional structure of a color conversion film according to an example. Fig. 1 shows an example in which a second color conversion layer is provided at an edge portion of one side, and Fig. 2 shows an example in which a second conversion layer is provided at an edge portion at opposite sides. 5 to 8 illustrate the top surface structure of the color conversion film according to an example. 5 to 8 show an example in which the second color conversion layer is provided on one side of one side of the first color conversion layer, on the edge of two sides, on the edge of three sides, and on the edge of four sides Respectively.

According to another embodiment of the present application, a transparent film is provided on at least one surface of the first color conversion layer. The transparent film is directly contacted to the first color conversion layer or attached through the adhesive layer. When the first color conversion layer is formed by coating a composition for forming a color conversion layer on one side of a transparent film, a separate adhesive layer may not be provided between the transparent film and the first color conversion layer.

3 and 4 show an example in which a transparent film is provided on one side of the first color conversion layer and a transparent film is provided on the other side of the first color conversion layer through an adhesive layer. 3 and 4 show a structure in which the transparent film attached through the adhesive layer and the second color conversion layer are in contact with each other, the transparent film attached through the adhesive layer is opposed to the second color conversion layer of the first color conversion layer Or may be provided on the opposite side of the surface.

The transparent film may function as a support in the production of the color conversion layer and may function as a protective film to prevent curling of the color conversion layer. The type of the transparent film is not particularly limited and is not limited to the material and thickness as long as it is transparent and can function as the support or the protective film. Here, transparent means that the visible light transmittance is 70% or more. For example, a PET film may be used as the transparent film. If necessary, a barrier film may be used as the above-mentioned transparent film. As the barrier film, those known in the art can be used.

The adhesive layer is used to adhere the transparent film to the first color conversion layer. The adhesive layer may be formed using a material known in the art unless the purpose of the present invention is solved. For example, the pressure-sensitive adhesive layer can be formed by using an adhesive tape or by coating a pressure-sensitive adhesive composition.

According to one embodiment of the present application, the resin matrix of the first color conversion layer and the resin matrix of the second color conversion layer may be the same kind or different kinds may be used. As the resin matrix, a thermoplastic polymer or a thermosetting polymer may be used. Specifically, examples of the material of the resin matrix include poly (meth) acrylate, polycarbonate (PC), polystyrene (PS), polyarylene (PAR), polyurethane (TPU ), Styrene-acrylonitrile series (SAN), polyvinylidene fluoride series (PVDF), modified polyvinylidene fluoride series (modified-PVDF), styrene-ethylene-butylene- Ethylene-butylene-styrene (hydrogenated SEBS) system or the like can be used. Compared to UV curing resins, thermoplastic or thermosetting polymers do not use the UV energy that comes out of the UV curing process and do not have radicals or cations that can attack the phosphors, thus preventing degradation of optical properties by UV energy or radicals or cations can do. As the resin matrix of the second color conversion layer, a UV curable acrylic resin, a thermosetting epoxy resin, a urethane resin, a silicone resin, or the like may be used in addition to the thermoplastic resin.

According to one embodiment of the present application, the same kind of phosphor may be used as the phosphor of the first color conversion layer and the phosphor of the second color conversion layer, or different types may be used. The content of the phosphor may be the same or different in the first color conversion layer and the second color conversion layer. The phosphor is not particularly limited as long as it is a phosphor that emits light having a wavelength different from that of the irradiated light. The emission of light of a wavelength different from that of the irradiated light does not necessarily mean that the wavelength of the emitted light and the wavelength of the emitted light do not overlap at all and means that the total wavelength of the emitted light and the total wavelength of the emitted light do not match , And only a part of the wavelength is different. For example, inorganic phosphors, organic phosphors, quantum dots or mixtures thereof may be used. As inorganic phosphors, organic phosphors and quantum dots, those known in the art can be used.

According to one embodiment of the present application, the same kind of phosphor is used as the phosphor of the first color conversion layer and the phosphor of the second color conversion layer. For example, when the phosphor of the first color conversion layer is red, the color at the edge portion of the color conversion film is blue when irradiated with blue light, so that the red phosphor is compensated for at the edge portion by the second color conversion layer It is possible to prevent blue coloring on the edge. When the phosphor of the first color conversion layer comprises a red phosphor and a green phosphor, it is preferable that the phosphor of the second color conversion layer also includes a red phosphor and a green phosphor.

The content ratio of the phosphor of the first color conversion layer and the phosphor of the second color conversion layer may be selected depending on the type of the phosphor. When the thicknesses of the first and second color conversion layers are the same, 450 it is preferable that the peak intensity of the light emission wavelength emitted from each layer at the time of light irradiation including the wavelength is determined such that the ratio of the second color conversion layer to the first color conversion layer is 0.1 to 5. [ According to one example, as the phosphor, a phosphor that emits light having a wavelength different from that of the light irradiated when light containing a wavelength of 450 nm can be used. For example, as the phosphor, a phosphor that emits light having a luminescence peak at 450 nm and a half width of 40 nm or less and a luminescence intensity distribution that is monomodal and which emits light of a wavelength different from that of the light irradiated may be used. Here, the emitted light may be green light having a wavelength selected from a wavelength of 500 nm to 560 nm, red light having a wavelength selected from a wavelength of 600 nm to 780 nm, or a mixture thereof. For example, the phosphor may include a phosphor that absorbs blue or green light to emit red light, a phosphor that absorbs blue light to emit green light, or a mixture thereof.

In this specification, blue light, green light, and red light may be defined as those known in the art, for example, blue light is light having a wavelength selected from a wavelength of 400 nm to 500 nm, green light is 500 nm to 560 nm, and the red light is light having a wavelength selected at a wavelength of 600 nm to 780 nm. In this specification, a green phosphor absorbs at least a part of blue light to emit green light, and a red phosphor absorbs at least a part of blue light or green light to emit red light. For example, the red phosphor may absorb blue light as well as light having a wavelength between 500 and 600 nm.

The content of the phosphor may be 0.005 part by weight to 2 parts by weight based on 100 parts by weight of the color conversion layer or the resin matrix included in each pattern.

According to one embodiment of the present application, the thickness of the first or second color conversion layer may be 1 to 200 micrometers. According to one example, the thickness of the first color conversion layer may be 2 to 50 micrometers, and the thickness of the second color conversion layer may be 1 to 50 micrometers, more preferably 1 to 20 micrometers. When the thickness of the second color conversion layer is within the above-mentioned range, it is possible to prevent the second color conversion layer from falling off or splintering due to friction between the films.

The color conversion film according to the above-described embodiments of the present application can be produced by forming a second color conversion layer on at least a part of the edge portion on at least one side of the first color conversion layer. According to one example, a second color conversion layer is attached to at least a part of the edge portion on at least one side of at least one surface of the first color conversion layer using an adhesive layer, or a method of directly coating the composition for producing a second color conversion layer . As the coating method, screen printing or ink jet printing can be used. After coating the second color conversion layer-forming composition, UV curing may proceed. For example, for screen printing conditions, the viscosity of the coating solution is preferably 3000 cps or more based on Brookfiled viscometer. If the viscosity is too low, the screen-printed coating solution will spread before UV curing and a desired pattern can not be obtained. As another example, a method may be used in which a dilute coating solution (100 cps or less) to which a thermoplastic resin is applied is patterned and dried by inkjet printing.

Wherein the color conversion layer comprises: coating a resin solution on which a phosphor is dissolved or dispersed; And drying the coated resin solution on the substrate, or extruding the phosphor together with the resin.

When the phosphor is an organic phosphor, since the organic phosphor is dissolved in the resin solution, the organic phosphor is homogeneously distributed in the solution, so that no separate dispersion step is required.

Additives may be added to the resin solution if necessary, and a light diffusion agent such as silica, titania, zirconia, and alumina powder may be added. Further, a dispersant may be further added for stable dispersion of the light-diffusing particles.

The resin solution in which the phosphor is dissolved or dispersed is not particularly limited if the phosphor and the resin are dissolved or dispersed in the solution.

According to one example, the organic phosphor is dissolved in a solvent to prepare a first solution, the resin is dissolved in a solvent to prepare a second solution, and the first solution and the second solution are mixed, A solution can be prepared. When the first solution and the second solution are mixed, it is preferable to mix them homogeneously. However, the present invention is not limited to this, but a method of dissolving an organic fluorescent substance and a resin in a solvent at the same time, a method of dissolving an organic fluorescent substance in a solvent followed by a dissolution by adding a resin, a method of dissolving a resin in a solvent, .

As the resin contained in the solution, the above-mentioned resin matrix material, a monomer curable with the resin matrix resin, or a mixture thereof can be used. For example, as the monomer curable with the resin matrix resin, there is a (meth) acrylic monomer, which can be formed from a resin matrix material by UV curing. In the case of using such a curable monomer, an initiator necessary for curing may be further added if necessary.

The solvent is not particularly limited and is not particularly limited as long as it can be removed by drying without adversely affecting the coating process. Non-limiting examples of the solvent include toluene, xylene, acetone, chloroform, various alcohol solvents, MEK (methyl ethyl ketone), MIBK (methyl isobutyl ketone), EA (ethyl acetate), butyl acetate, Cyclohexanone, PGMEA (propylene glycol methyl ethyl acetate), dioxane, DMF (dimethylformamide), DMAc (dimethylacetamide), DMSO (dimethylsulfoxide), NMP (N-methylpyrrolidone) And the like, and they may be used alone or in combination of two or more. When the first solution and the second solution are used, the solvent contained in each of these solutions may be the same or different. Even when different kinds of solvents are used for the first solution and the second solution, it is preferable that these solvents have compatibility so that they can be mixed with each other.

A roll-to-roll process can be used for the step of coating the resin solution on which the organic fluorescent material is dissolved on the substrate. For example, a step of dissolving a substrate from a roll on which a substrate is wound, coating a resin solution in which the organic fluorescent material is dissolved on one side of the substrate, drying the coated substrate, and then winding the coated substrate on a roll. In the case of using a roll-to-roll process, it is preferable to determine the viscosity of the resin solution within a range in which the process can be performed, and may be determined within a range of, for example, 200 to 2,000 cps.

As the coating method, various known methods can be used, for example, a die coater may be used, and various bar coating methods such as a comma coater, a reverse comma coater, and the like may be used.

After the coating, a drying process is performed. The drying process can be carried out under the conditions necessary for removing the solvent. For example, a color conversion layer containing a phosphor having a desired thickness and concentration on a substrate can be obtained on a substrate in a direction in which the substrate proceeds in a coating process, and dried under a condition that the solvent is sufficiently blown in an oven located adjacent to the coater.

When a monomer curable with the resin matrix resin is used as the resin contained in the solution, curing such as UV curing may be performed before or during the drying.

When the phosphor is extruded together with the resin to form a film, an extrusion method known in the art may be used. For example, a phosphor may be used as a polycarbonate (PC), a poly (meth) acryl, a styrene- acrylonitrile ) Can be extruded together to produce a color conversion layer.

Another embodiment of the present application provides a backlight unit including the above-mentioned color conversion film. The backlight unit may have a backlight unit configuration known in the art, except that it includes the color conversion film. For example, Figs. 9 and 10 show an example. 9, a color conversion film according to the above-described embodiments is provided between the light guide plate and the reflection plate. A second color conversion layer may be provided on a surface of the color conversion film adjacent to the light guide plate or a second color conversion layer may be provided on a surface adjacent to the reflection plate of the color conversion film. According to Fig. 10, a color conversion film according to the above-described embodiments is provided on the opposite surface of the light guide plate opposite to the reflection plate. The second color conversion layer may be provided on the surface of the color conversion film adjacent to the light guide plate or the second color conversion layer may be provided on the opposite surface of the color conversion film adjacent to the light guide plate. 9 and 10 illustrate a structure including a light source and a reflector surrounding the light source. However, the structure is not limited thereto, and may be modified in accordance with a backlight unit structure known in the art. In addition, the light source may be a direct-type as well as a side-chain type, and the reflection plate or the reflection layer may be omitted or replaced with another structure if necessary, and if necessary, additional films such as a light diffusion film, Etc. may be further provided.

9 and 10, a scattering pattern may be provided on the upper surface or the lower surface of the light guide plate, if necessary. 11 shows an example in which a scattering pattern is provided on the lower surface of the light guide plate, that is, the reflection plate, and FIG. 12 shows an example in which scattering patterns are provided on the upper surface of the light guide plate, that is, the surface opposite to the reflection plate . The light introduced into the light guide plate has an uneven light distribution due to repetition of optical processes such as reflection, total reflection, refraction, and transmission, and the scattering pattern can be used to guide the uneven light distribution to uniform brightness .

According to another embodiment of the present application, a display device including the above-described backlight unit is applied. The display device is not particularly limited as long as it includes the above-described backlight unit as a component. For example, the display device includes a display module and a backlight unit. 13 and 14 illustrate the structure of the display device. However, the present invention is not limited thereto. Further, additional films such as a light diffusion film, a condensing film, a brightness enhancement film, and the like may be additionally provided between the display module and the backlight unit if necessary.

Hereinafter, the present invention will be described in more detail by way of examples. However, the following examples are for illustrative purposes only and are not intended to limit the scope of the invention.

Example One

The first color conversion layer was prepared as follows.

A green organic phosphor (film state half bandwidth: 49 nm, quantum efficiency: 0.93) of the following structural formula was dissolved in solvent DMF to prepare a first solution.

The thermoplastic resin PMMA was dissolved in the solvent DMF to prepare a second solution.

The first solution and the second solution were mixed so that the amount of the organic phosphor was 0.5 parts by weight based on 100 parts by weight of the PMMA, and they were homogeneously mixed. The solids content of the mixed solution was 20% by weight and the viscosity was 200 cps. This solution was coated on a PET substrate and dried to prepare a first color conversion layer. The cover PET film was laminated on the upper surface of the manufactured first color conversion layer by applying an adhesive film, and then cut to fit the BLU size for display. In this experiment, the size was cut to a size of 1215 mm (w) x 685 mm (h) on a 55-inch (diagonal length) basis.

A second color conversion layer was prepared as follows.

Nitride red phosphor SCASN (manufactured by Denka Corporation) was dispersed in an acrylic UV curable resin (viscosity 10,000 cps) (solid content of red phosphor: 5 wt%).

A dot pattern was formed by applying the phosphor dispersing resin to the four edge portions of the upper end of the film including the first color conversion layer cut on a prepared 55-inch (diagonal length) basis, Thereby preparing a color conversion layer.

At this time, the dot pattern was formed to 50 mm from the edge line of the first color conversion layer, and the dot size gradually decreased in size from the outermost periphery to the inside. The pattern density of the second color conversion layer was 10%. Here, the pattern density has the following meaning.

(Pattern density) = (width of the pattern in contact with the first color conversion layer) / (width of area in which the pattern exists)

Example 2

The procedure of Example 1 was repeated except that the pattern density of the second color conversion layer was 30%.

Example 3

The procedure of Example 1 was repeated except that the pattern density of the second color conversion layer was changed to 5%.

Example 4

The procedure of Example 1 was repeated except that the phosphor concentration of the second color conversion layer was changed to 10 wt%.

Example 5

And the pattern density of the second color conversion layer was 25%.

Comparative Example

Except that the second color conversion layer was not formed.

The results of measuring the physical properties of the color conversion films prepared in Examples and Comparative Examples are shown in Tables 1, 16, and 17 below.

R / G ratio means a ratio of a peak intensity of a red spectrum to a peak intensity of a green spectrum, and an R / B ratio means a ratio of a peak intensity of a red spectrum to a peak intensity of a blue spectrum. Deviation means the difference between the value of the measurement spectrum at the position of 4 mm from the border line and the value of the position of 96 mm from the border line.

(-) value means that the red portion of the rim portion is less than the green portion, and it is preferable to be able to converge to zero. It is the most significant result that the R / G deviation is close to 0 on the actual visual evaluation, and the R / B deviation is closer to 0, which is preferable.

R / G ratio deviation R / B ratio deviation Comparative Example 1 -0.11 0.04 Example 1 -0.05 -0.02 Example 2 -0.02 -0.05 Example 3 -0.03 -0.02 Example 4 -0.01 0.00 Example 5 -0.01 -0.05

Claims

A first color conversion layer including a resin matrix and a phosphor dispersed in the resin matrix and emitting light having a wavelength different from that of the irradiated light when irradiated with light having a wavelength of 450 nm; And
And a phosphor dispersed in the resin matrix and emitting light having a wavelength different from that of the light irradiated when the light having a wavelength of 450 nm is irradiated, at least a part of the edge portion on at least one side of the first color conversion layer And a second color conversion layer including at least two spaced patterns including a first color conversion layer and a second color conversion layer,
When a light source including a blue light having a maximum wavelength of 445 nm and a green light having a maximum wavelength of 535 nm is used and an emission spectrum is measured with a luminance meter after a color conversion film is laminated on a light guide plate, Wherein the Wx, Wy deviation or u ', v' deviation measured at 4 mm intervals on the straight line is 0.05 or less, and the R / G ratio or R / B ratio deviation is 0.1 or less.

The color conversion film according to claim 1, further comprising a transparent film provided on at least one side of the first color conversion layer.

The color conversion film according to claim 1, wherein the second color conversion layer includes two or more patterns having different sizes or shapes from each other.

The color conversion film according to claim 1, wherein the patterns of the second color conversion layer have a configuration in which the horizontal area decreases from the edge portion to the center portion of the first color conversion layer.

2. The color conversion device according to claim 1, wherein the edge portion of the first color conversion layer has a width that is 10% or less of the width of the first color conversion layer in a direction perpendicular to the edge line from the edge line of the first color conversion layer film.

The color conversion film according to claim 1, wherein the second color conversion layer has a pattern density of 5% to 70%.

The phosphor according to claim 1, wherein the content ratio of the phosphor of the first color conversion layer to the phosphor of the second color conversion layer is 450 nm or less when the first color conversion layer and the second color conversion layer have the same thickness Wherein the peak intensity of the light emission wavelength emitted from each layer at the time of light irradiation is determined so that the ratio of the first color conversion layer to the second color conversion layer is 0.1 to 5. [

delete

A backlight unit comprising the color conversion film according to any one of claims 1 to 7.

A display device comprising a backlight unit according to claim 9.