KR20200018917A - Color conversion film, polarizing plate and display appratus comprising the same - Google Patents

Abstract

The present specification relates to a color conversion film, which includes a diazaporphyrin-based compound, satisfies formulas (1) and (2), and the half-width of a main absorption peak of which is 25 nm or less when irradiated with visible light, wherein formula (1) is Q/Q′ >= 7, and formula (2) is ¦λ(Q) - λ(Q′)¦ < 45 nm. The present invention also relates to a backlight unit and a display device including the color conversion film. The display device according to one embodiment of the present specification exhibits an effect of improving a color gamut and luminance.

Description

Color conversion film, polarizer and display device including same {COLOR CONVERSION FILM, POLARIZING PLATE AND DISPLAY APPRATUS COMPRISING THE SAME}

The present specification relates to a color conversion film, a polarizing plate including the same, and a display device.

Recently, attempts have been made to realize colors closer to natural colors, that is, high color reproduction rates. To achieve high color reproducibility, the color purity of each of the R, G, and B colors must be very high.

Conventional light emitting diodes (LEDs) are obtained by mixing a green phosphor and a red phosphor into a blue light emitting diode, or by mixing a yellow phosphor and a blue-green phosphor into a UV light emitting diode. However, this method is difficult to control the pure color of the R, G, B, and thus has a limitation in implementing a high color gamut.

In order to overcome this drop in color reproducibility, a method of embodying green and red has been recently attempted by forming quantum dots into a blue LED. However, cadmium-based quantum dots have a problem that the safety and environmental issues must be overcome, and other quantum dots have a problem that the efficiency is significantly lower than cadmium-based, relatively high efficiency, environmentally friendly, no stability issues Attention has been drawn to the manufacture of display devices employing.

Recently, research is being conducted to apply a color conversion film to increase the color purity of a display. For example, research into a color conversion film to which a tetraazaporphyrin (TAP) -based material absorbing a specific wavelength (a range of about 590 nm to 600 nm) is applied is also being conducted. However, the TAP has a problem in that the brightness of the display is lowered due to a characteristic of absorbing light in the 550 nm region, that is, light that does not help the color reproducibility, in addition to light absorption for improving the color reproducibility, thereby improving the material. The research on is very important. In particular, in order to increase the selectivity for light absorption, research on a material having a very narrow absorption spectrum is required.

Korean Patent Publication No. 2000-0011622

The present specification provides a color conversion film, a polarizing plate and a display device including the same.

An exemplary embodiment of the present specification includes a diazapyphyrin-based compound,

Satisfy the following formula (1) and formula (2),

Provided is a color conversion film having a half width of the main absorption peak of 25 nm or less when irradiated with light in the visible light region.

Equation (1): Q / Q '≥ 7

Equation (2): | λ (Q)-λ (Q ') | <45 nm

In the formula (1) and formula (2),

Q is the height of the main absorption peak upon light irradiation,

Q 'is the height of the auxiliary absorption peak during light irradiation,

λ (Q) is a wavelength at the time of light irradiation indicating a main absorption peak,

λ (Q ') is a wavelength which shows an auxiliary absorption peak when irradiating light.

Another embodiment of the present specification provides a polarizing plate including the color conversion film described above.

Another embodiment of the present specification provides a backlight unit including the color conversion film described above.

Another embodiment of the present specification provides a display device including the polarizing plate described above.

Another embodiment of the present specification provides a display device including the backlight unit described above.

The display device according to the exemplary embodiment of the present specification has an effect of improving color reproduction and luminance.

1 illustrates a structure of a polarizing plate according to an exemplary embodiment of the present specification.
2 illustrates a structure of a backlight unit according to an exemplary embodiment of the present specification.
3 illustrates a structure of a display device according to an exemplary embodiment of the present specification.
4 is a diagram illustrating an absorption spectrum according to a wavelength of a color conversion film according to an exemplary embodiment of the present specification.

An exemplary embodiment of the present specification includes a diazapyphyrin-based compound,

Satisfy the following formula (1) and formula (2),

Provided is a color conversion film having a half width of the main absorption peak of 25 nm or less when irradiated with light in the visible light region.

Equation (1): Q / Q '≥ 7

Equation (2): | λ (Q)-λ (Q ') | <45 nm

In the formula (1) and formula (2),

Q is the height of the main absorption peak upon light irradiation,

Q 'is the height of the auxiliary absorption peak during light irradiation,

λ (Q) is a wavelength at the time of light irradiation indicating a main absorption peak,

λ (Q ') is a wavelength which shows an auxiliary absorption peak at the time of light irradiation.

The color conversion film according to an exemplary embodiment of the present specification satisfies Equation (1) and Equation (2), thereby increasing color reproducibility and minimizing luminance loss of a display. This means that in the case of using the light absorption dye as a method for achieving a high color reproducibility, the brightness of the display can be greatly improved.

In the present specification, “half-width” means the width of an absorption peak at a point corresponding to half of the maximum height of an absorption peak in an absorption spectrum in which the color conversion film absorbs light in the visible light region. The half width of the diazapopyrine compound and the color conversion film is preferably smaller in order to increase the selectivity of light to be absorbed.

In an exemplary embodiment of the present specification, the "main absorption peak" is a portion that directly plays a role in improving the color reproducibility, and when the light absorption of the color conversion film is measured, the color reproducibility is measured in the measurement result (absorption spectrum). It means the highest peak (highest absorbance) in the visible region of 500 nm or more, which is a related region.

In an exemplary embodiment of the present specification, the "secondary absorption peak" is an area that may inhibit the luminance of the display by making an absorption of unnecessary light, in addition to improving color reproducibility, when measuring the light absorption of the color conversion film. In the measurement result (absorption spectrum), it means the second highest peak (second highest absorption) in the visible light region of 500 nm or more.

In one embodiment of the present specification, the "visible light" may be interpreted as used in the art. For example, it means light having a wavelength range of 380 nm to 780 nm.

In one embodiment of the present specification, the primary absorption peak and the secondary absorption peak can be measured using a UV-vis spectrometer (SHIMADZU UV-3600 Plus).

4 is a diagram illustrating an absorption spectrum according to a wavelength of a color conversion film according to an exemplary embodiment of the present specification. In FIG. 4, (a) shows a main absorption peak and (b) shows a secondary absorption peak.

In one embodiment of the present specification, the main absorption peak is present at 580nm to 610nm.

In one embodiment of the present specification, the auxiliary absorption peak is present at 530nm to 580nm.

The color conversion film according to the exemplary embodiment of the present specification includes a diazaporphyrin (DAP) -based compound.

In the case of the Tetraazaporphyrin (TAP) -based compound used in the conventional color conversion film, the wavelength difference between the main absorption peak (Q) and the auxiliary absorption peak (Q ') is separated by about 45 nm or more. In addition, the TAP-based compound includes four isomers in the synthetic method, which increases the full width at half-maximum (FWHM) of the absorption spectrum. Therefore, when the TAP-based compound is applied as a dye of the color conversion film, the selectivity of light absorption is lowered, resulting in a decrease in brightness and color purity of the display device.

On the other hand, since the DAP-based compound can inhibit isomer formation in the synthesis process, it can form a sharp absorption spectrum compared to the TAP dye.

In an exemplary embodiment of the present specification, the diazapyphyrin-based compound is represented by the following Formula 1.

[Formula 1]

In Chemical Formula 1,

R1, R2, R4 and R5 are hydrogen; Halogen group; Nitrile group; Silyl groups; Or a substituted or unsubstituted alkyl group,

At least three of R1, R2, R4 and R5 are halogen groups; Nitrile group; Silyl groups; Or a substituted or unsubstituted alkyl group,

R3 and R6 are substituted or unsubstituted aryl groups.

According to Formula 1, the diazapopyrine-based compound is Cu which is substituted in the pyrrole ring.

In one embodiment of the present specification, by introducing Cu in the general formula (1), it shows the effect of increasing the absorbance of the porphyrin-based dye. Increasing absorbance increases the main absorption wavelength of the absorption spectrum, thereby minimizing the height of the auxiliary absorption peak. This effect is especially pronounced in the diazapophyrin structure. In addition, since Cu is relatively easy to introduce into the diazapophyrin ring, there is an advantage that the synthesis process can be simplified compared to other metals such as Pd.

In the present specification, the term "substituted or unsubstituted" refers to a halogen group; Alkyl groups; Cycloalkyl group; Aryl group; And it is substituted with one or two or more substituents selected from the group consisting of a heterocyclic group or two or more of the substituents exemplified above are substituted with a substituent, or means that do not have any substituents.

In the present specification, the halogen group may be fluorine, chlorine, bromine or iodine.

In the present specification, the alkyl group may be linear or branched chain, carbon number is not particularly limited, but is preferably 1 to 30. Specific examples include, but are not limited to, methyl, ethyl, propyl, isopropyl, butyl, heptyl, and the like.

In the present specification, the cycloalkyl group is not particularly limited, but preferably has 3 to 30 carbon atoms, and specifically includes a cyclopropyl group, a cyclobutyl group, a cyclopentyl group, a cycloheptyl group, a cyclooctyl group, and the like. It is not.

In the present specification, the aryl group may be monocyclic or polycyclic.

When the aryl group is a monocyclic aryl group, carbon number is not particularly limited, but is preferably 6 to 30 carbon atoms. Specifically, the monocyclic aryl group may be a phenyl group, a biphenyl group, a terphenyl group, etc., but is not limited thereto.

Carbon number is not particularly limited when the aryl group is a polycyclic aryl group. It is preferable that it is C10-30. Specifically, the polycyclic aryl group may be a naphthyl group, anthracenyl group, phenanthryl group, pyrenyl group, peryllenyl group, chrysenyl group and fluorenyl group, but is not limited thereto.

In the present specification, the heterocyclic group includes one or more atoms other than carbon and heteroatoms, and specifically, the heteroatoms may include one or more atoms selected from the group consisting of O, N, Se, S, and the like. Although carbon number is not particularly limited, it is preferably 2 to 30 carbon atoms, the heterocyclic group may be monocyclic or polycyclic. Examples of the heterocyclic group include, but are not limited to, thiophene group, pyridyl group, pyrimidyl group, triazinyl group, benzothiophene group, dibenzothiophene group, benzofuranyl group, and dibenzofuranyl group. .

In the present specification, specifically, the silyl group includes trimethylsilyl group, triethylsilyl group, t-butyldimethylsilyl group, vinyldimethylsilyl group, propyldimethylsilyl group, triphenylsilyl group, diphenylsilyl group, phenylsilyl group, and the like. However, the present invention is not limited thereto.

In one embodiment of the present specification, the color conversion film includes a resin matrix and a diazapopyrine-based compound dispersed in the resin matrix.

In one embodiment of the present specification, the material of the resin matrix is preferably a thermoplastic polymer or a thermosetting polymer. Specifically, the material of the resin matrix is a poly (meth) acrylic resin, such as polymethyl methacrylate (PMMA), polycarbonate (PC) resin, polystyrene (PS) resin, polyarylene (PAR) resin Polyurethane (TPU) resin, styrene-acrylonitrile (SAN) resin, polyvinylidene fluoride (PVDF) resin, and modified polyvinylidene fluoride (modified-PVDF) resin may be used. .

In one embodiment of the present specification, the color conversion film may include 0.005 parts by weight to 4 parts by weight based on 100 parts by weight of the DAP-based compound of the resin matrix solids. More specifically, the DAP-based compound may include 0.02 parts by weight to 4 parts by weight based on 100 parts by weight of the resin matrix solids.

In one embodiment of the present specification, the light absorbency is measured in a film state. The film may be prepared using a method of coating and drying a resin solution in which a diazaporphyrin (DAP) compound is dissolved on a substrate or by extruding the DAP compound together with a resin.

In one embodiment of the present specification, the substrate may function as a support in the manufacture of the color conversion film. It does not specifically limit as a kind of base material, As long as it is transparent and can function as the said support body, it is not limited to the material and thickness. Transparent here means that visible light transmittance is 75% or more. For example, a PET film, a TAC film, or the like may be used as the substrate.

In one embodiment of the present specification, the resin solution is not particularly limited as long as the above-described DAP compound and resin are dissolved in the solution. For example, the resin solution in which the DAP compound is dissolved may be prepared by dissolving the DAP compound in a solvent to prepare a first solution, preparing a second solution by dissolving the resin in a solvent, and then mixing the first solution with the second solution. It can be manufactured by. When mixing the first solution and the second solution, it is preferable to mix homogeneously. However, the manufacturing method of the resin solution is not limited thereto, but the method of dissolving the DAP compound and the resin in the solvent at the same time, the method of dissolving the DAP compound in the solvent, followed by the addition of the resin to dissolve, the resin in the solvent and then the DAP system The method of dissolving a compound can be used.

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

The solvent 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 alcoholic solvents, DCM (dichloromethane), MEK (methyl ethyl ketone), MIBK (methyl isobutyl ketone), EA (ethyl acetate), butyl Acetate, DMF (dimethylformamide), DMAc (dimethylacetamide), DMSO (dimethyl sulfoxide), NMP (N-methyl-pyrrolidone) and the like can be used, and one or two or more kinds thereof can be used in combination. have. When using the said 1st solution and a 2nd solution, the solvent contained in each of these solutions may be the same, and may differ. Even when different kinds of solvents are used in the first solution and the second solution, it is preferable that these solvents have compatibility so that they can be mixed with each other.

In one embodiment of the present specification, the color conversion film further includes one or more of an acrylic pressure-sensitive adhesive, an isocyanate-based crosslinking agent, and a silane coupling agent.

The process of coating the resin solution in which the DAP compound is dissolved on a substrate may use a roll-to-roll process. For example, after the substrate is unrolled from the roll on which the substrate is wound, the resin solution in which the organic phosphor is dissolved may be coated on one surface of the substrate, dried, and then wound on the roll. When using a roll-to-roll process, it is preferable to determine the viscosity of the said resin solution to the range in which the said process is possible, for example, it can determine within the range of 50cps-2,000cps.

As the coating method, various known methods may be used. For example, a die coater may be used, or a variety of bar coating methods such as a comma coater and reverse comma coater may be used.

In one embodiment of the present specification, a drying process is performed after the coating. The drying process can be carried out under the conditions necessary to remove the solvent. For example, it is possible to obtain a color conversion film including a DAP-based compound having a desired thickness and concentration on the substrate by drying under conditions that the solvent is sufficiently blown in an oven located adjacent to the coater in the direction in which the substrate proceeds during the coating process.

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

In one embodiment of the present specification, when the organic phosphor is extruded together with a resin to form a film, an extrusion method known in the art may be used. For example, the organic phosphor may be polycarbonate (PC), poly A color conversion film can be manufactured by extruding resins, such as a (meth) acrylic-type and a styrene- acrylonitrile-type (SAN) together.

In one embodiment of the present specification, the color conversion film further includes a pressure-sensitive adhesive.

In one embodiment of the present specification, the pressure-sensitive adhesive is an adhesive that acts as an adhesive material when pressure is applied, and any material used in the art may be used without limitation. For example, an acrylic pressure sensitive adhesive or a silicone pressure sensitive adhesive may be used as the pressure sensitive adhesive.

In one embodiment of the present specification, the color conversion film is included in a polarizing plate. At this time, the polarizing plate may have a polarizing plate configuration known in the art except for including the color conversion film described above. For example, the polarizing plate may include a color conversion film, a protective film, and a polarizer.

1 illustrates a structure of a polarizing plate according to an exemplary embodiment of the present specification. Specifically, FIG. 1 illustrates a structure of a polarizing plate in which the color conversion film 10, the first protective film 20, the polarizer 30, and the second protective film 40 are sequentially stacked.

In one embodiment of the present specification, the first protective film and the second protective film may be an acrylic film or a tri-acetyl-cellulose (TAC) film.

In one embodiment of the present specification, the polarizer may use a polarizer known in the art. For example, a film made of polyvinyl alcohol (PVA) containing iodine or dichroic dye may be used.

In one embodiment of the present specification, the color conversion film is included in the backlight unit. The backlight unit may have a backlight unit configuration known in the art except for including the color conversion film described above.

In one embodiment of the present specification, the backlight unit includes a light guide plate; Reflector; Condensing film; And at least one of the brightness enhancing film. For example, the backlight unit may have a structure in which a reflecting plate / light guide plate / color conversion film / condensing film 2 sheets / luminance enhancement film is stacked.

In one embodiment of the present specification, a prism sheet may be used as the light collecting film. The light collecting film may include one prism sheet or two prism sheets, which may be stacked in a direction perpendicular to each other. For example, the light collecting film may include a first light collecting film and a second light collecting film. In this case, the first light collecting film may be a first prism sheet, and the second light collecting film may be a second prism sheet in which an array of the first prism sheet and the prism is vertically stacked.

In one embodiment of the present specification, the prism sheet may be known ones. When a prism sheet is used as the light collecting film, the color conversion film may be provided on any surface of the light collecting film with the prism or without the prism. In this case, the surface with the prism is an uneven surface of the prism sheet, the surface without the prism may mean a flat surface of the prism sheet.

In one embodiment of the present specification, the first light collecting film and the second light collecting film may be bonded by an adhesive. At this time, if the adhesive is used in the art it can be used without limitation.

In one embodiment of the present specification, the brightness enhancing film may be a double brightness enhanced film (DBEF) or an advanced polarizer film (APF).

2 illustrates a structure of a backlight unit according to an exemplary embodiment of the present specification. Specifically, FIG. 2 illustrates a structure of a backlight unit in which a reflecting plate 50, a light guide plate 60, a color conversion film 10, a prism sheet 80, and a brightness enhancement film 90 are sequentially stacked.

In one embodiment of the present specification, the backlight unit includes a light source including a light emitting lamp for emitting light having a maximum emission wavelength of 440 nm to 460 nm.

In FIG. 2, a configuration including a light source 70 and a reflection plate surrounding the light source is exemplified, but is not limited thereto, and may be modified according to 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 a reflecting plate or a reflective layer may be omitted or replaced with another configuration as necessary.

In one embodiment of the present specification, the display device includes the polarizing plate or the backlight unit.

In one embodiment of the present specification, the display device includes an upper polarizer, a color filter, a lower polarizer, and a backlight unit.

3 illustrates a structure of a display device according to an exemplary embodiment of the present specification. Specifically, FIG. 3 illustrates a display structure including an upper polarizer 100a, a color filter 200, a lower polarizer 100b, and a backlight unit 300.

In one embodiment of the present specification, the display device includes the color conversion film in the upper polarizing plate.

In one embodiment of the present specification, an upper glass may be attached between the upper polarizing plate and the color filter.

In one embodiment of the present specification, a lower glass may be attached to the lower polarizing plate side between the lower polarizing plate and the backlight unit.

In one embodiment of the present specification, the display device has an effect of improving luminance by applying a color conversion film having a small half width and satisfying Formulas (1) and (2).

In one embodiment of the present specification, the display device is a liquid crystal display device or an organic electroluminescent display device.

In one embodiment of the present specification, the display device may be included in, for example, a TV, a monitor of a computer, a notebook, a mobile phone, and the like.

Hereinafter, the present invention will be described in detail with reference to Examples. However, embodiments according to the present disclosure may be modified in various other forms, and the scope of the present specification is not interpreted to be limited to the embodiments described below. The embodiments of the present specification are provided to more fully describe the present specification to those skilled in the art.

Example 1.

100 parts by weight (15.3 wt%) of the butyl acrylate (BA) / hydroxy ethyl methacrylate (HEMA) copolymer solution with the acrylic pressure-sensitive adhesive, 0.05 parts by weight of the following compound 1-1, 0.05 parts by weight of isocyanate-based crosslinking agent (T-39) In addition, T-789J 0.07 parts by weight of silane coupling agent, 45 parts by weight of dichloromethane (DCM) was added and mixed to prepare a coating solution, which was coated on a base film (PET) to a thickness of 20μm to prepare a color conversion film It was.

[Compound 1-1]

Example 2.

A color conversion film was prepared in the same manner as in Example 1, except that Compound 1-2 was used instead of Compound 1-1 in Example 1.

[Compound 1-2]

Example 3

A color conversion film was prepared in the same manner as in Example 1, except that Compound 1-3 was used instead of Compound 1-1 in Example 1.

[Compound 1-3]

Comparative Example 1.

A color conversion film was prepared in the same manner as in Example 1 except that Compound 1-1 was used instead of Compound 1-1 in Example 1.

[Compound 2-1]

Comparative Example 2.

A color conversion film was manufactured in the same manner as in Example 1, except that the following Compound 2-2 was used instead of Compound 1-1 in Example 1.

[Compound 2-2]

Comparative Example 3.

A color conversion film was prepared in the same manner as in Example 1, except that the following Compound 2-3 was used instead of Compound 1-1 in Example 1.

[Compound 2-3]

Comparative Example 4.

A color conversion film was manufactured in the same manner as in Example 1, except that the following Compound 2-4 was used instead of Compound 1-1 in Example 1.

[Compound 2-4]

Comparative Example 5.

A color conversion film was manufactured in the same manner as in Example 1, except that the following Compound 2-5 was used instead of Compound 1-1 in Example 1.

[Compound 2-5]

Comparative Example 6.

A color conversion film was manufactured in the same manner as in Example 1, except that the following Compound 2-6 was used instead of Compound 1-1 in Example 1.

[Compound 2-6]

Comparative Example 7.

A color conversion film was manufactured in the same manner as in Example 1, except that Compound 2-7 was used instead of Compound 1-1 in Example 1.

[Compound 2-7]

Comparative Example 8.

A color conversion film was manufactured in the same manner as in Example 1, except that the following Compound 2-8 was used instead of Compound 1-1 in Example 1.

[Compound 2-8]

Comparative Example 9.

A color conversion film was manufactured in the same manner as in Example 1, except that the following Compound 2-9 was used instead of Compound 1-1 in Example 1.

[Compound 2-9]

Comparative Example 10.

A color conversion film was manufactured in the same manner as in Example 1, except that the following Compound 2-10 was used instead of Compound 1-1 in Example 1.

[Compound 2-10]

Experimental Example 1. Measurement of absorption spectrum

The absorption spectrum measurement results of the color conversion films prepared in Examples 1 to 3 and Comparative Examples 1 to 10 are shown in Table 1 below.

The absorption spectrum was measured using a UV-vis spectrometer (UV-3600 Plus by SHIMADZU).

λ _max (nm) FWHM (nm) Q / Q ' λ (Q)
-λ (Q ') | Example 1 588 18 7.0 40 Example 2 591 17 7.2 38 Example 3 596 21 7.0 39 Comparative Example 1 592 21 6.1 47 Comparative Example 2 583 22 5.2 48 Comparative Example 3 571 22 5.9 35 Comparative Example 4 582 24 5.2 42 Comparative Example 5 586 23 5.4 40 Comparative Example 6 589 25 5.4 41 Comparative Example 7 562 15 5.8 38 Comparative Example 8 573 15 5.2 43 Comparative Example 9 576 16 5.3 40 Comparative Example 10 580 18 5.3 42

In Table 1 above,

λ _max is the wavelength of maximum absorption in the visible region of 500 nm or more,

FWHM is the half width at the main absorption wavelength of the absorption specification.

Q is the height of the main absorption peak upon light irradiation,

Q 'is the height of the auxiliary absorption peak during light irradiation,

λ (Q) is a wavelength at the time of light irradiation indicating a main absorption peak,

λ (Q ') is a wavelength which shows an auxiliary absorption peak at the time of light irradiation.

From Table 1, it can be confirmed that Examples 1 to 3 satisfy the following formulas (1) and (2) while the half width is 25 nm or less.

Equation (1): Q / Q '≥ 7

Expression (2): | λ (Q)-λ (Q ') | <45 nm

In the case of Comparative Examples 1-10, Formula (1) or Formula (2) is not satisfied.

Experimental Example 2. Measurement of luminance change rate, visible light reflectance, 550 nm light reflectance, white CCT, and color coordinate

The above-described embodiment is applied to a liquid crystal display panel including a back light unit including YAG: Ce phosphor and a blue LED and color filters R, G, and B (0.678, 0.319), (0.279, 0.587), and (0.138, 0.083), respectively. The color conversion films prepared in Examples 1 to 3 and Comparative Examples 1 to 10 were attached, and the luminance change rate, visible light reflectance, 550 nm light reflectance, White CCT, and color coordinates were measured.

Luminance and white CCT characteristics were measured using a spectroradiometer SR-UL2, and light reflectance was measured using Ocean Optics' Spectrometer (HR400).

At this time, λ _max of the color conversion film of Examples 1 to 3 and Comparative Example 1 After adjusting the amount of dye so as to satisfy the transmittance of DCI 90, 92 and 94, respectively, as shown in Table 2, luminance change rate, visible light reflectance, 550 nm light reflectance, White CCT and color coordinates were measured.

DCI compound Λ _max transmittance of color conversion film Luminance change rate Visible light reflectance 550nm light reflectance White cct
(K) x, y coordinates u'v 'coordinates x y u ' v ' 90 2-1
(Comparative Example 1) 34.0 One 4.4 4.7 10048 0.2803 0.2881 0.190 0.440 1-1
(Example 1) 23.5 1.2 4.4 4.8 10029 0.2803 0.2885 0.190 0.440 1-2
(Example 2) 23.0 1.1 4.5 4.8 9996 0.2805 0.2885 0.190 0.440 92 2-1
(Comparative Example 1) 16.0 One 3.8 4.2 10026 0.2804 0.2883 0.190 0.440 1-1
(Example 1) 11.0 1.6 4.0 4.4 10059 0.2803 0.2879 0.190 0.440 1-2
(Example 2) 8.5 1.2 4.0 4.3 10002 0.2805 0.2886 0.190 0.440 94 2-1
(Comparative Example 1) 9.5 One 3.5 3.9 10020 0.2805 0.2881 0.190 0.440 1-1
(Example 1) 6.5 1.8 3.8 4.2 9972 0.2807 0.2886 0.190 0.440 1-2
(Example 2) 4.2 1.4 3.7 4.0 10025 0.2804 0.2882 0.190 0.440

From Table 2, it can be confirmed that Examples 1 and 2 exhibited excellent luminance change rate, visible light reflectance, and 550 nm light reflectance compared to Comparative Example 1. Through this, it can be seen that the color conversion film produced in the embodiment of the present specification exhibits color reproducibility and luminance improvement effects.

10: color conversion film
20: first protective film
30: polarizer
40: second protective film
50: reflector
60: light guide plate
70: light source
80: prism sheet
90: brightness enhancement film
100: polarizer
100a: upper polarizer
100b: lower polarizer
200: color filter
300: backlight unit

Claims (10)

It contains a diazapyphyrin type compound,
Satisfy the following formula (1) and formula (2),
Color conversion film having a half width of the main absorption peak of 25 nm or less when irradiated with light in the visible light region:
Equation (1): Q / Q '≥ 7
Equation (2): | λ (Q)-λ (Q ') | <45 nm
In the formula (1) and formula (2),
Q is the height of the main absorption peak upon light irradiation,
Q 'is the height of the auxiliary absorption peak during light irradiation,
λ (Q) is a wavelength at the time of light irradiation indicating a main absorption peak,
λ (Q ') is a wavelength which shows an auxiliary absorption peak at the time of light irradiation. The method according to claim 1,
The diazapopyrine-based compound is a color conversion film represented by the formula (1):
[Formula 1]

In Chemical Formula 1,
R1, R2, R4 and R5 are hydrogen; Halogen group; Nitrile group; Silyl groups; Or a substituted or unsubstituted alkyl group,
At least three of R1, R2, R4 and R5 are halogen groups; Nitrile group; Silyl groups; Or a substituted or unsubstituted alkyl group,
R3 and R6 are substituted or unsubstituted aryl groups. The method according to claim 1,
The main absorption peak is present in the color conversion film 580nm to 610nm. The method according to claim 1,
The secondary absorption peak is present in the color conversion film 530nm to 580nm. The method according to claim 1,
The color conversion film further comprises a pressure-sensitive adhesive. A polarizing plate comprising the color conversion film according to any one of claims 1 to 5. A backlight unit comprising the color conversion film according to any one of claims 1 to 5. Display device comprising a polarizing plate according to claim 6. The method according to claim 8,
The display device is a liquid crystal display device or an organic electroluminescent display device. Display device comprising a backlight unit according to claim 7.

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