WO2023277569A1 - Feuille optique composite et dispositif d'affichage la comprenant - Google Patents

Feuille optique composite et dispositif d'affichage la comprenant Download PDF

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Publication number
WO2023277569A1
WO2023277569A1 PCT/KR2022/009308 KR2022009308W WO2023277569A1 WO 2023277569 A1 WO2023277569 A1 WO 2023277569A1 KR 2022009308 W KR2022009308 W KR 2022009308W WO 2023277569 A1 WO2023277569 A1 WO 2023277569A1
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WIPO (PCT)
Prior art keywords
layer
light
composite sheet
optical composite
curing
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PCT/KR2022/009308
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English (en)
Korean (ko)
Inventor
최용재
반재훈
김태훈
조규중
Original Assignee
에스케이씨하이테크앤마케팅(주)
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Publication of WO2023277569A1 publication Critical patent/WO2023277569A1/fr

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/02—Diffusing elements; Afocal elements
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/02—Diffusing elements; Afocal elements
    • G02B5/0205—Diffusing elements; Afocal elements characterised by the diffusing properties
    • G02B5/0236—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place within the volume of the element
    • G02B5/0242—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place within the volume of the element by means of dispersed particles
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/04—Prisms
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/04—Prisms
    • G02B5/045—Prism arrays
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/20—Filters
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/20—Filters
    • G02B5/208—Filters for use with infrared or ultraviolet radiation, e.g. for separating visible light from infrared and/or ultraviolet radiation
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/20—Filters
    • G02B5/22—Absorbing filters
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/20—Filters
    • G02B5/22—Absorbing filters
    • G02B5/223—Absorbing filters containing organic substances, e.g. dyes, inks or pigments
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0065—Manufacturing aspects; Material aspects
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors

Definitions

  • Embodiments relate to an optical composite sheet having improved color gamut and luminance, and a display device including the same.
  • a liquid crystal display displays an image using the optical properties of liquid crystal. Since a liquid crystal display panel displaying an image is a non-emission type device that does not emit light itself, it is disposed on the rear surface of the liquid crystal display panel together with the liquid crystal display panel to display the liquid crystal. It has a structure including a back-light unit supplying light to the display panel. While the liquid crystal display has advantages of being thinner, lighter in weight, less power consumption, and lower driving voltage than other display devices, it is somewhat inferior to other display devices in terms of color.
  • Patent Document 1 Korean Patent Publication No. 2012-0072194
  • An optical sheet applied to a backlight unit of a display device performs functions such as condensing, diffusing, reflecting, and the like, and when two or more functions are combined, individual optical functions can be complemented and maximized.
  • the color gamut may be improved by combining the optical sheet with a light absorbing layer that blocks unnecessary wavelengths other than RGB.
  • a light absorbing layer that blocks unnecessary wavelengths other than RGB.
  • the manufacturing process is simpler than before. It was also possible to minimize the decrease in luminance due to light absorption while improving the color gamut.
  • the present inventors were able to secure optical properties and mechanical/chemical properties while preventing deterioration of organic dyes due to UV curing by adjusting the composition of the UV curing layer.
  • an object of the embodiment is to provide an optical composite sheet having excellent luminance and processability while improving a color gamut, a manufacturing method thereof, and a display device including the same.
  • a prism sheet and a UV curing layer, wherein the UV curing layer is disposed as an outermost layer on one surface of the prism sheet, and the UV curing layer includes a light absorber that selectively absorbs light in a specific wavelength band;
  • An optical composite sheet is provided in which the absorbent contains at least one organic dye.
  • forming a coating layer by applying a UV curable composition containing a light absorber that selectively absorbs light of a specific wavelength band on one surface of the substrate layer; Obtaining a UV cured layer by irradiating UV light to the coating layer in a chamber in which the oxygen concentration is adjusted to 10% by volume or less; and forming a prism pattern layer on the other surface of the substrate layer, wherein the light absorber includes at least one organic dye, and a method for manufacturing an optical composite sheet is provided.
  • a light source a display panel receiving light from the light source and displaying an image
  • an optical composite sheet disposed in a light path from the light source to the display panel, the optical composite sheet comprising: a prism sheet; and a UV curing layer, wherein the UV curing layer is disposed on one surface of the prism sheet as an outermost layer of the optical composite sheet, and the UV curing layer includes a light absorber that selectively absorbs light in a specific wavelength band. and wherein the light absorber includes at least one type of organic dye.
  • the optical composite sheet according to the embodiment is manufactured in a simpler manufacturing process than the prior art by adding one or more organic dyes that selectively absorb light in a specific wavelength band to the UV curing layer, which was previously provided on the outermost surface for various functions. It is possible to provide an optical composite sheet in which a decrease in luminance due to light absorption is minimized while improving a painted color gamut. In addition, according to a preferred embodiment, it is possible to secure optical properties and mechanical properties while preventing deterioration of organic dyes due to UV curing by adjusting the composition of the UV curing layer.
  • the optical composite sheet according to the embodiment may be applied to a backlight unit of a display device such as an LCD to improve performance.
  • FIG. 1 shows a manufacturing method of an optical composite sheet according to one embodiment.
  • FIG. 2 shows a method of manufacturing an optical composite sheet according to another embodiment.
  • FIG 3 shows a process of forming a first prism pattern layer and laminating with a second substrate layer.
  • FIG. 4 shows a cross-sectional view of an optical composite sheet according to the prior art.
  • FIG. 5 shows a cross-sectional view of an optical composite sheet according to an embodiment.
  • FIG. 6 shows a cross-sectional view of an optical composite sheet according to another embodiment.
  • FIG. 7 shows a cross-sectional view of an optical composite sheet according to another embodiment.
  • FIG. 8 shows a cross-sectional view of an optical composite sheet according to another embodiment.
  • FIG. 9 is a cross-sectional view of a prism sheet included in an optical composite sheet.
  • FIG. 10 is a cross-sectional view of a prism sheet included in an optical composite sheet.
  • FIG. 11 is a cross-sectional view of a prism sheet included in an optical composite sheet.
  • FIG. 12 is a cross-sectional view of a light diffusing layer included in an optical composite sheet.
  • FIG. 13 is a cross-sectional view of a reflective polarizing film included in an optical composite sheet.
  • FIG. 14 shows a cross-sectional view of a thermal curing layer according to one embodiment.
  • 15 is a cross-sectional view of a backlight unit according to an exemplary embodiment.
  • 16 is an exploded perspective view of a display device according to an exemplary embodiment.
  • FIG. 17 illustrates a display device and a traveling direction of light according to an exemplary embodiment.
  • 19 shows a transmission spectrum of an optical composite sheet according to an embodiment.
  • FIG. 20 shows a net absorbance of an optical composite sheet according to an embodiment.
  • Example 22 shows transmission spectra of the optical composite sheets of Example 1 and Comparative Example 3.
  • 3-1 1st curing device, 3-2: 2nd curing device,
  • UV curing layer 100: UV curing layer, 100': UV curing coating layer,
  • 150 light absorbing layer (thermal curing layer)
  • 200 prism sheet
  • 201 base layer
  • 202 prism pattern layer
  • 202a first pattern
  • 202b second pattern
  • first prism sheet first prism sheet
  • 220 second prism sheet
  • first substrate layer 211: first substrate layer
  • 212 first prism pattern layer
  • 600, 610, 620, 630 adhesive layer, 601: meniscus,
  • 700 light guide plate
  • 800 reflector
  • UV UV light
  • T1 the thickness of the substrate layer
  • T2 the thickness of the pattern layer
  • Ta height of the first pattern
  • Tb height of the second pattern
  • CG full color gamut
  • CG0 overlapping color gamut
  • CG1 first color gamut
  • CG2 second color gamut
  • R red
  • G green
  • B blue
  • one component is formed above/under another component or is connected or coupled to each other includes all forms, connections, or couplings between these components directly or indirectly through another component. .
  • the criterion for the top/bottom of each component may vary according to the direction in which the object is observed.
  • the UV curing layer refers to a layer in which UV light is the main curing factor
  • the thermal curing layer refers to a layer in which heat is the main curing factor
  • a method of manufacturing an optical composite sheet includes forming a coating layer by applying a UV curable composition including a light absorber that selectively absorbs light of a specific wavelength band on one surface of a substrate layer; Obtaining a UV cured layer by irradiating UV light to the coating layer in a chamber in which the oxygen concentration is adjusted to 10% by volume or less; and forming a prism pattern layer on the other surface of the substrate layer, wherein the light absorber includes at least one organic dye.
  • FIG. 4 shows a cross-sectional view of an optical composite sheet according to the prior art.
  • FIG. 4 is a cross-sectional view of the optical composite sheet of Comparative Example 1.
  • the conventional optical composite sheet further includes a light absorbing layer 150 to improve the color gamut of the display device.
  • a light absorbing layer serves to block unnecessary wavelengths other than RGB by including, for example, one or more organic dyes that selectively absorb light in a specific wavelength band.
  • organic dyes generally have an unsaturated bond (eg, a conjugated bond) such as a double bond between carbons, and thus can selectively absorb light in a specific wavelength band.
  • organic dyes having an unsaturated bond are easily reduced in activity due to a radical reaction caused by UV light, so conventionally, they have been mainly added only to a simple coating layer (non-curing layer) or a resin layer cured by heat.
  • a simple coating layer non-curing layer
  • a resin layer cured by heat As a result, since conventional light absorbing layers containing organic dyes do not have sufficient mechanical strength or chemical resistance, an additional functional coating layer 310 formed by UV curing is provided on the surface of the light absorbing layer 150 as an outermost layer.
  • the formation of such a double coating layer not only complicates the manufacturing process and increases the total thickness to decrease luminance, but also may cause a problem of detachment due to interface defects of the double coating layer.
  • UV light in order to prevent deterioration of organic dyes in the UV curing layer by UV light, it may be attempted to additionally add a UV blocker and a light stabilizer, but UV light is absorbed by these UV blockers and light stabilizers and the curing degree is lowered Since it lacks mechanical strength and chemical resistance, it is not suitable as the outermost layer.
  • the curing degree does not decrease even when a UV blocker and a light stabilizer are added together with organic dyes.
  • a UV cured layer having excellent mechanical strength and chemical resistance can be obtained.
  • UV curing is performed by a chain reaction of free radicals induced from a photoinitiator, and by significantly reducing the concentration of oxygen that interferes with this, excellent curing degree can be implemented even when a UV blocker and a light stabilizer are added together with organic dyes.
  • the oxygen concentration in the UV curing chamber may be adjusted to 10 vol% or less, 5 vol% or less, 3 vol% or less, or 1 vol% or less.
  • the oxygen concentration in the UV curing chamber may be adjusted to 0.01 vol% to 10 vol%, or 0.05 vol% to 5 vol%.
  • the oxygen concentration of the chamber may be adjusted to 10% by volume or less. Specifically, the oxygen concentration may be adjusted by vaporizing liquid nitrogen. In addition, oxygen may be replaced by introducing nitrogen into the chamber at a flow rate of 100 L/min to 500 L/min for 1 minute to 10 minutes.
  • UV light with a wavelength of 350 nm to 400 nm by a light source such as Fe or Hg is irradiated with a light amount of 100 mJ/cm 2 to 500 mJ/cm 2 for 0.2 to 1 minute in a chamber in which the oxygen concentration is adjusted, thereby UV curing. can be performed.
  • FIG. 1 shows a manufacturing method of an optical composite sheet according to one embodiment. Specifically, FIG. 1 shows a method of forming a UV curing layer including a light absorber to prepare an optical composite sheet according to the embodiment.
  • the method includes (a) preparing a first base layer 211; (b) applying a UV curable composition containing a light absorber on one surface of the first base layer 211 to obtain a sheet having a UV curable coating layer 100'; (c) putting the sheet into a UV curing chamber 2 and replacing oxygen (O 2 ) with nitrogen (N 2 ) in the chamber; and (d) irradiating the sheet with UV light to obtain a sheet having a UV cured layer 100 formed on one surface of the first base layer 211 .
  • the UV curable composition may include a light absorber, a binder resin, and other additives (UV blocker, antioxidant, light stabilizer, etc.).
  • the UV curable composition may include 0.01 to 1 part by weight of the light absorber based on 100 parts by weight of the binder resin.
  • the UV curable composition may include the UV blocker in a weight ratio of 50 to 200 times the weight of the light absorber.
  • the UV curable composition may include the antioxidant in a weight ratio of 1 to 10 times the weight of the light absorber.
  • the UV curable composition may include the light stabilizer in a weight ratio of 10 to 50 times the weight of the light absorber.
  • the content of each component may be based on solid content.
  • the UV curable composition may further include an organic solvent for viscosity control for coating.
  • the solvent may be included such that the solid content of the UV curable composition is 10% to 50% by weight.
  • Specific examples of the organic solvent include toluene, methyl ethyl ketone, ethyl acetate, and the like, and other solvents are also possible.
  • the light absorber since the light absorber includes an organic dye, it is uniformly dissolved in an organic solvent to improve light absorption characteristics after coating.
  • the UV curable composition may further include components for providing additional functions.
  • the UV curable composition may further include beads having a particle size of 0.5 ⁇ m to 20 ⁇ m.
  • FIG. 2 shows a method of manufacturing an optical composite sheet according to another embodiment. Specifically, FIG. 2 shows a method of manufacturing an optical composite sheet by forming a prism pattern layer after forming a UV curing layer in advance.
  • the method includes (a) preparing a sheet on which a UV cured layer 100 including a light absorber is formed on one surface of a first base layer 211; (b) obtaining a first prism sheet 210 by forming a first prism pattern layer 212 on the other surface of the first base layer 211 (the opposite surface on which the UV curing layer is formed); and (c) combining the second prism sheet 210 on which the second prism pattern layer 222 is formed on one surface of the second substrate layer 221 with the first prism sheet 210 by means of an adhesive layer 610.
  • the prism pattern may be formed by transferring a pattern formed on a cylindrical master roll to a coating layer by a roll to roll method.
  • a pattern may be engraved on the master roll by cutting the outer circumferential surface (circumferential surface of a cylinder) of the master roll with a bite, laser, or the like.
  • the prism pattern layer composition may be coated on the base film, and the pattern of the master roll may be transferred to the coating layer to form a prism pattern.
  • the prism pattern may be formed by melting the plastic raw material as heat by extrusion and transferring the pattern of the master roll while the liquid plastic flat plate is solidified.
  • the prism patterns may be manufactured to have different heights, and master rolls for this may be manufactured by cutting using a diamond tool, for example.
  • a continuous groove pattern may be formed by thread cutting along the circumference of the roll while moving a diamond tool in a transverse direction while rotating a cylindrical roll made of a material such as hard copper.
  • the pitch of the prism pattern can be changed by adjusting the moving speed of the diamond tool, and the prism can be adjusted by adjusting the penetration depth of the diamond tool into the cylindrical roll, the horizontal/vertical angle between the tool and the surface of the roll, and the rotational speed of the cylindrical roll.
  • the specifications of the pattern can be changed more diversely and in detail.
  • a method of manufacturing an optical composite sheet includes (1a) forming a coating layer by applying a UV curable composition including a light absorber that selectively absorbs light in a specific wavelength band on the lower surface of the first base layer; (1b) obtaining a UV cured layer by irradiating UV light to the coating layer in a chamber in which the oxygen concentration is adjusted to 10% by volume or less; (2a) forming a first prism pattern layer by coating a composition for forming a first prism pattern on the upper surface of the first base layer, transferring the pattern, and curing the pattern by UV; (2b) laminating a second substrate layer on an upper surface of the first prism pattern layer; and (3) forming a second prism pattern layer on the upper surface of the second substrate layer, wherein the UV curable composition includes a binder resin, a light absorber and a UV blocker, and the light absorber comprises at least one organic material. contains dyes;
  • steps (2a) and (2b) may be performed in separate process lines or simultaneously in one process line.
  • FIG. 3 shows a process of forming a first prism pattern layer and laminating with a second substrate layer. Specifically, FIG. 3 shows a process of forming a first prism pattern layer using a pattern roll and laminating with a second substrate layer.
  • the first base layer having a UV cured layer formed thereon is unwound from the first unwinding roll 2-1, and the prism pattern is formed on the first base layer by the first coating device 3-1.
  • a layer composition is applied.
  • a prism pattern is formed by the pattern roll 4 and at the same time UV cured by the first curing device 5-1 to manufacture a first prism pattern layer.
  • the second substrate layer is unwound from the second unwinding roll 2-2, and the UV curable adhesive composition is applied on the second substrate layer by the second coating device 3-2. Then, it is laminated to the surface of the first prism pattern layer while passing between the two pressure rolls 6, and then UV cured by the second curing device 5-2, so that the second substrate layer, the first prism pattern layer, A composite sheet having a first substrate layer and a UV curing layer can be obtained. Then, a final optical composite sheet may be obtained by forming a second prism pattern layer on the surface of the second substrate layer of the composite sheet.
  • the absorbent includes one or more organic dyes.
  • the optical composite sheet includes at least one prism sheet.
  • the optical composite sheet includes a light absorber in a prism pattern layer of at least one prism sheet.
  • the prism sheet may be disposed in a light path from the light source to the display panel.
  • the optical composite sheet may include at least one of an additional prism sheet, a light diffusion layer, and a dual luminance enhancement film on the other surface of the prism sheet.
  • the optical composite sheet may further include a base film, a buffer film, a functional coating layer, and an adhesive layer.
  • the optical composite sheet does not include organic dyes in component layers not formed by UV curing.
  • the optical composite sheet does not include a heat curing layer containing organic dyes.
  • Conventional optical composite sheets have attempted to improve the color gamut by including organic dyes in a coating layer by simple drying or a layer formed by thermal curing, but according to the present invention, these simple coating layers or thermal curing layers contain organic dyes. Even without it, a sufficient color gamut enhancement effect can be provided.
  • the prism sheet serves to improve luminance by condensing light due to a difference in refractive index at the interface of the prism pattern.
  • the prism sheet 200 includes a substrate layer 201 and a prism pattern layer 202 formed on the substrate layer.
  • the pattern shape of the pattern layer is not particularly limited, and for example, light may be refracted at the interface by having a long triangular prism shape.
  • the prism sheet may include a plurality of prism patterns having different heights.
  • the prism pattern may include a first pattern 202a and a second pattern 202b having different heights.
  • a ratio (Tb/Ta) of the height Tb of the second pattern to the height Ta of the first pattern may be 0.5 to 0.99 or 0.8 to 0.95.
  • the apex of the top of the first pattern 202a penetrates into the adhesive layer 600 and is bonded. At this time, a meniscus 601 is generated, degrading the light condensing performance. Therefore, by making the height of the second pattern 202b different from that of the first pattern to preserve the shape of the upper end, degradation of light condensing performance can be suppressed.
  • the base layer and the pattern layer may be made of the same material, and for example, the base layer and the pattern layer may be integrally manufactured. Alternatively, the base layer and the pattern layer may be made of different materials, and for example, a pattern layer may be formed thereon after manufacturing the base layer.
  • polyester resin polyethersulfone resin, acrylic resin, polyetherimide resin, polyphenylene sulfide resin, polyarylate resin, polyimide resin, polycarbonate resin, cellulose triacetate resin , Cellulose acetate propionate resin, etc.
  • the material of the base layer may be a polyester resin, particularly a polyethylene terephthalate resin or a polyethylene naphthalate resin.
  • the material of the pattern layer may be a UV curable resin, and may be, for example, an acrylate-based resin such as epoxy acrylate or urethane acrylate, a methacrylate-based resin, or an epoxy resin.
  • the thickness T1 of the base layer of the prism sheet may be 30 ⁇ m to 300 ⁇ m, specifically 50 ⁇ m to 200 ⁇ m, and the thickness T2 of the pattern layer may be 10 ⁇ m to 100 ⁇ m. It may be ⁇ m, specifically, it may be 20 ⁇ m to 60 ⁇ m.
  • the UV curing layer is disposed as an outermost layer on one surface of the prism sheet.
  • the UV curing layer includes a light absorber that selectively absorbs light in a specific wavelength band.
  • the light absorber selectively absorbs light in a specific wavelength band.
  • the light absorber may have a main absorption wavelength within a visible light wavelength band.
  • the main absorption wavelength of the light absorber may belong to a band excluding pure RGB wavelength within the visible light wavelength band.
  • the main absorption wavelength of the light absorber may fall within 470 nm to 520 nm or 550 nm to 620 nm.
  • the main absorption wavelength of the light absorber may fall within 480 nm to 510 nm, 560 nm to 610 nm, or 580 nm to 620 nm.
  • the light absorber includes one or more organic dyes.
  • the organic dye selectively absorbs light in a specific wavelength band.
  • the organic dye may have a chromophore that selectively absorbs light in a specific wavelength band.
  • the organic dye has an unsaturated bond (eg, a conjugated bond) such as a double bond, and thus can selectively absorb light in a specific wavelength band.
  • the light absorber may include at least one organic dye selected from the group consisting of pyrrolmethines, rhodamines, borondipyrromethenes, tetraazaporphyrins, squarines, and cyanines.
  • Organic dyes having an unsaturated bond as described above are easily added to a conventional coating layer or a thermosetting resin layer because a radical reaction occurs due to UV light and the activity is easily reduced.
  • a certain level or more of strength through UV curing is required as the outermost layer, there has been a conventional problem in that it is difficult to add a light absorber to the UV cured layer.
  • the content of the light absorber is 0.01 wt% to 10 wt%, for example 0.01 wt% to 7 wt%, 0.01 wt% to 5 wt%, or 0.01 wt% to 10 wt% based on the weight of the UV curing layer.
  • the organic dye may be included in an amount of 0.01 wt % to 10 wt % based on the weight of the UV curing layer. More specifically, the organic dye may be included in an amount of 0.01 wt% to 1 wt% based on the weight of the UV curing layer.
  • the content of the light absorber is 0.01 parts by weight or more, 0.015 parts by weight or more, 0.02 parts by weight or more, 0.025 parts by weight or more, 0.03 parts by weight or more, 0.035 parts by weight or more based on 100 parts by weight of the UV curable resin included in the UV curable layer. part or more, or 0.04 part by weight or more, and may be 1 part by weight or less, 0.5 part by weight or less, 0.1 part by weight or less, 0.05 part by weight or less, 0.045 part by weight or less, 0.04 part by weight or less, 0.035 part by weight or less, 0.03 part by weight or less. , or 0.025 parts by weight or less.
  • the UV curing layer includes a UV curing type resin.
  • the UV curable resin may be composed of components suitable for coating and UV curing, and may be, for example, a UV curable resin as exemplified above.
  • the UV curable resin is composed of urethane acrylate, epoxy acrylate, polyester acrylate, acrylic acrylate, silicone acrylate, polybutadiene acrylate, melamine acrylate, epoxy-modified acrylate and urethane-modified acrylate. It may be one or more selected from the group.
  • the UV curing layer may further include at least one of a UV blocker, an antioxidant, and a light stabilizer.
  • the UV blocker may be at least one selected from the group consisting of a hydroxybenzotriazole-based UV blocker, a tris-resorcinol-triazine chromophore-based UV blocker, and a hydroxyphenyl-benzotriazole chromophore-based UV blocker.
  • the antioxidant may be at least one selected from the group consisting of amine-based, phenol-based, sulfur-based, phosphine-based, phosphite-based, and thioester-based antioxidants.
  • the light stabilizer may be at least one selected from the group consisting of hindered amine light stabilizers (HALS), benzotriazole, and benzophenol light stabilizers.
  • HALS hindered amine light stabilizers
  • benzotriazole benzotriazole
  • benzophenol light stabilizers benzophenol light stabilizers
  • the weight of the UV blocker included in the UV curing layer may be 10 times or more, 30 times or more, or 50 times or more, and may be 500 times or less, 300 times or less, 200 times or less, or 100 times or less compared to the weight of the light absorber. . Specifically, the weight of the UV blocker may be 10 to 500 times, or 50 to 200 times the weight of the light absorber. In addition, the content of the UV blocker may be 0.5% by weight or more, 1% by weight or more, or 3% by weight or more, and 10% by weight or less, 7% by weight or less, or 5% by weight or less based on the weight of the UV curing layer, Specifically, it may be 1% by weight to 10% by weight.
  • the weight of the antioxidant included in the UV curing layer may be 0.5 times or more, 1 time or more, 2 times or more, 10 times or more, or 30 times or more, and 100 times or less, 10 times or less, It may be 7 times or less, or 5 times or less. Specifically, the weight of the antioxidant may be 1 to 10 times the weight of the light absorber.
  • the weight of the light stabilizer included in the UV curing layer may be 0.2 times or more, 0.5 times or more, 1 time or more, 5 times or more, or 10 times or more, and also 50 times or less, 30 times or less, compared to the weight of the light absorber. , 20 times or less, 10 times or less, or 5 times or less. Specifically, the weight of the light stabilizer may be 10 to 50 times the weight of the light absorber.
  • the UV curing layer may further include a photoinitiator, specifically at least one selected from the group consisting of (2,4,6-trimethylbenzoyl)diphenylphosphine, hydroxydimethylacetophenone, and methylbenzoylformate. can be all day
  • the photoinitiator may be included in an amount of 0.5 wt % to 5 wt % based on the weight of the UV curing layer.
  • the weight of the photoinitiator included in the UV curable layer may be 0.5 parts by weight to 5 parts by weight based on 100 parts by weight of the UV curable resin.
  • the amount of the UV blocker may be 0.5 times, 1 time or more, or 1.5 times or more, and may be 10 times or less, 5 times or less, or 3 times or less, based on the weight of the photoinitiator.
  • the weight of the UV blocker may be 0.5 to 10 times the weight of the photoinitiator.
  • the UV curing layer may further include components for providing additional functions.
  • the UV curing layer may further include beads having a particle size of 0.5 ⁇ m to 20 ⁇ m.
  • the bead may be an organic bead, and the specific material may be at least one selected from the group consisting of an acrylate-based resin, a polystyrene resin, a nylon resin, and a silicone resin, and more specifically, may be a hard acrylate-based resin.
  • the shape of the bead is not particularly limited, but may be spherical, for example.
  • the particle diameter of the beads is advantageous in terms of hiding power, luminance, and preventing splitting with adjacent layers, and may be 0.5 ⁇ m to 10 ⁇ m, or 0.8 to 6 ⁇ m, more specifically.
  • the content of the beads may be 0.1% to 10% by weight based on the weight of the UV curing layer.
  • the content of the beads may be 0.01% by weight or more, 0.05% by weight or more, 0.1% by weight or more, or 0.5% by weight or more based on the weight of the UV curing layer, and also 10% by weight or less, 5% by weight or less. , 3 wt% or less or 1 wt% or less.
  • the content of the beads may be 0.1 wt% to 5 wt%, 0.1 wt% to 3 wt%, or 0.1 wt% to 1 wt% based on the weight of the UV curing layer.
  • the UV curing layer selectively absorbs light in a specific wavelength band due to the light absorber included therein.
  • the UV curing layer may have a main absorption wavelength within a visible light wavelength band.
  • the main absorption wavelength of the UV curing layer may belong to a band excluding pure RGB wavelength within the visible light wavelength band. Accordingly, the UV curing layer may improve a color gamut by blocking unnecessary wavelengths other than pure RGB wavelengths emitted from a light source.
  • the main absorption wavelength of the UV curing layer may fall within 470 nm to 520 nm, or 550 nm to 620 nm.
  • the main absorption wavelength of the UV curing layer may fall within 480 nm to 510 nm, 560 nm to 610 nm, or 580 nm to 620 nm.
  • the UV curing layer may additionally have a sub-absorption wavelength having a lower absorption rate than the main absorption wavelength, and the sub-absorption wavelength may also belong to a visible light wavelength band.
  • the sub-absorption wavelength may also belong to a band excluding pure RGB wavelengths within the visible light wavelength band.
  • the sub absorption wavelength may belong to a pure RGB wavelength band unlike the main absorption wavelength, and for example, the sub absorption wavelength may belong to 510 nm to 560 nm or 530 nm to 570 nm.
  • the UV curing layer may have a main absorption wavelength at 580 nm to 620 nm and a sub absorption wavelength at 530 nm to 570 nm.
  • the color gamut can be more effectively improved.
  • the UV curing layer may have an ultraviolet transmittance within a certain range.
  • the UV-A light transmittance of the UV curing layer may be 10% or more, 20% or more, or 30% or more, and may be 80% or less, 70% or less, 60% or less, or 50% or less.
  • the UV curing layer may have transmittance of 10% to 70% with respect to UV-A light.
  • the UV curing layer may have a visible light transmittance of at least a certain level.
  • the UV curing layer may have a light transmittance of 30% or more, 45% or more, 50% or more, or 70% or more, specifically 30% to 90%, or 50% to 90% for a wavelength of 590 nm.
  • the UV curing layer has excellent mechanical/chemical properties.
  • the UV cured layer may exhibit 3B or more, more specifically 4B or more in a crosshatch test according to the ASTM D3359 standard. Accordingly, since the UV curing layer has sufficient strength as the outermost layer, there is no need to form an additional overcoating layer.
  • the UV cured layer may have little swelling in solvents such as methyl ethyl ketone and ethanol. Accordingly, even if chemicals are applied to the UV curing layer in the manufacturing process of the product, the organic dye does not stick to the surface and the quality can be maintained.
  • the UV curing layer may have additional functions.
  • the UV curable layer 100 includes beads 110 dispersed in the UV curable resin 120 to form roughness on the surface, thereby preventing grinding with adjacent layers. function can be provided additionally.
  • the dot print pattern on the lower part of the light guide plate or the concavo-convex pattern by laser processing, or the frictional wear caused by the vibration on the upper part of the optical composite sheet prevents interface cracking from occurring. can do.
  • the UV curing layer may further provide a light diffusing function by including a bead.
  • the bead may conceal a prism pattern or the like by diffusing light.
  • the UV curing layer has a certain level of haze, so that a luminance enhancement effect can be obtained while having sufficient hiding power.
  • the UV curing layer may have a haze of 3% to 30% or 60% to 99%.
  • the UV curing layer may provide a heat resistance function of the optical composite sheet.
  • the UV curing layer may include a heat-resistant polymer resin, for example, a phenyl silicone-based resin.
  • the UV curing layer may function as a hard coating layer improving surface hardness at the outermost part of the optical composite sheet.
  • the optical composite sheet according to the embodiment may include a reflective polarizing film to improve luminance.
  • the reflective polarizing film may be disposed on the prism sheet.
  • the reflective polarizing film refers to a film that produces a desired optical effect by a plurality of thin films stacked therein, and may include, for example, a dual luminance enhancement film (DBEF).
  • DBEF dual luminance enhancement film
  • the reflective polarizing film may include two or more types of thin films having different optical properties in a stacked form.
  • the reflective polarizing film may have a stack M of a plurality of thin films between two skin layers S.
  • the optical properties different from each other of the thin films may be refractive index or phase difference.
  • the reflective polarizing film may be one in which first resin layers and second resin layers having different optical properties are alternately laminated in 100 to 2000 layers, specifically, 800 to 1000 layers.
  • the optical composite sheet may further include a buffer film to protect the skin layer of the reflective polarizing film.
  • 15 is a cross-sectional view of a backlight unit according to an exemplary embodiment. Specifically, as shown in FIG. 15 , when the prism sheet 220 is disposed under the reflective polarizing film 400, the pattern of the prism sheet 210 may affect the thin film of the reflective polarizing film to deteriorate performance. there is. Accordingly, by disposing the buffer film 500 between the reflective polarizing film 400 and the prism sheet 220, such degradation in performance can be prevented.
  • the material of the buffer film may be, for example, a polyester resin, and specifically, a polyethylene terephthalate resin.
  • the optical composite sheet may include an adhesive layer between its components (prism sheet, base film, reflective polarizing film, buffer film, etc.).
  • thermosetting resins and UV curable resins may be used as materials for the adhesive layer, and for example, acrylic, urethane, epoxy, vinyl, polyester, polyamide, or mixtures thereof may be used.
  • acrylic resin include methyl methacryl, methacryl, ethyl acryl, butyl acryl, aryl acryl, hexyl acryl, isopropyl methacryl, benzyl acryl, vinyl acryl, or a single polymer of 2-methoxyethyl acryl resin or copolymers thereof. synthetic or blended resins.
  • Preferred examples of the material of the adhesive layer are (meth) acrylate-based resins, unsaturated polyester resins, polyester (meth) acrylate resins, silicone urethane (meth) acrylate resins, silicone polyester (meth) acrylate resins, fluorine urethane (meth)acrylate resins, and mixtures thereof.
  • the optical composite sheet according to the embodiment may further include one or two or more functional coating layers.
  • a functional coating layer may be formed on the upper surface of the optical composite sheet 11 .
  • a functional coating layer may be formed between the prism sheet 220 and the UV curing layer 100 under the optical composite sheet 11 .
  • the functional coating layer may be, for example, a light diffusion layer, a hard coating layer, or a heat resistant coating layer.
  • a light diffusion layer 320 may be formed on the upper surface of the optical composite sheet 11 .
  • the light diffusion layer may conceal a prism pattern or the like by diffusing light.
  • the optical composite sheet may include one or two or more light diffusion layers. Specifically, a light diffusion layer may be formed on top of the optical composite sheet.
  • the light diffusion layer may have a haze of 60% to 99%, more specifically, a haze of 60% to 98%. When within the above preferred haze range, there is an advantage of high luminance while having sufficient hiding power.
  • the heat-resistant coating layer serves to increase the heat resistance of the optical composite sheet by including a heat-resistant polymer resin.
  • the heat-resistant polymer resin may include, for example, a phenyl silicone-based resin.
  • the hard coating layer may be provided, for example, on the upper surface of the optical composite sheet to improve surface hardness.
  • the surface hardness of the hard coating layer may be 2H or more, specifically 3H or more, or 4H or more.
  • the light diffusion layer 320 may include a bead 321 and a binder resin 322 .
  • the bead may be an organic bead, and the specific material may be at least one selected from the group consisting of an acrylate-based resin, a polystyrene resin, a nylon resin, and a silicone resin, and more specifically, may be a hard acrylate-based resin.
  • the shape of the bead is not particularly limited, but may be spherical, for example.
  • the average particle diameter of the beads is advantageous in terms of hiding power, brightness and prevention of splitting with adjacent layers to have an average particle diameter of 5 ⁇ m to 20 ⁇ m, and more specifically, 0.5 ⁇ m to 10 ⁇ m, or 0.8 to 6 ⁇ m. there is.
  • the binder resin may be at least one of a thermoplastic resin, a thermosetting resin, and a photocurable resin.
  • thermoplastic resin and the thermosetting resin include acrylic resins, urethane resins, epoxy resins, urethane acrylate resins, epoxy acrylate resins, cellulose resins, acetal resins, melamine resins, phenolic resins, and silicone resins. , polyester resins, polycarbonate resins, polyethylene resins, polystyrene resins, polyamide resins, polyimide resins, mixtures thereof, and the like.
  • the UV curable resin a photopolymerizable prepolymer that is crosslinked and cured by UV light irradiation may be used, and the photopolymerizable prepolymer may include a cationic polymerization type and a radical polymerization type photopolymerizable prepolymer.
  • the cationically polymerized photopolymerizable prepolymer include epoxy-based resins and vinyl ester-based resins, and examples of the epoxy-based resins include bisphenol-based epoxy resins, novolac-type epoxy resins, alicyclic epoxy resins, aliphatic epoxy resins, and mixtures thereof; and the like.
  • the functional coating layer may further include a heat stabilizer, a UV photoinitiator, a coupling agent, an antioxidant, a surfactant, a silicone additive, a UV absorber, and the like, if necessary.
  • the UV photoinitiator is not particularly limited as long as it can be used to cure a UV curable resin in general. ⁇ -hydroxyketone, phenylglyoxylate, benzyldimethyl-ketal, ⁇ -aminoketone, triarylsulfonium hexafluoroantimonate ), cationic photoinitiators such as triarylsulfonium hexafluorophosphate and diaryliodonium salt.
  • the coupling agent may include a silane coupling agent, a titanate-based coupling agent, an aluminate-based coupling agent, a silicone compound, and the like, and these coupling agents may be used alone or in combination.
  • the antioxidant may include a phenol-based, sulfur-based or phosphorus-based antioxidant, and the antioxidant may be used to improve heat resistance stability of a cured product by preventing deterioration due to oxidation of the thermosetting resin composition.
  • the surfactant is a compound having a hydrocarbon hydrophobic group of a certain length in the molecule and a hydrophilic group such as -COONa and -OSO 3 Na in the molecule, anionic surfactants, cationic surfactants, nonionic surfactants, amphoteric surfactants, sulfonic acid salts, sulfates, sulfate ester salts, ethoxylates, and the like, and these surfactants may be used alone or in combination.
  • the optical composite sheet according to the embodiment may further include a base film on which the functional coating layer is coated. That is, the functional coating layer may be coated on the base film.
  • the material of the base film may be, for example, a polyester resin, and specifically, a polyethylene terephthalate resin.
  • the thickness of the components of the optical composite sheet described above may be adjusted within a certain range.
  • the thickness of the prism sheet may be 50 ⁇ m or more or 80 ⁇ m or more, and may be 300 ⁇ m or less or 200 ⁇ m or less.
  • the thickness of the UV curing layer may be 1 ⁇ m or more, 2 ⁇ m or more, or 3 ⁇ m or more, and may be 50 ⁇ m or less, 30 ⁇ m or less, 10 ⁇ m or less, or 5 ⁇ m or less.
  • the UV curing layer may have a thickness of 1 ⁇ m to 10 ⁇ m.
  • the functional coating layer may have a thickness of 3 ⁇ m or more or 5 ⁇ m or more, and may be 30 ⁇ m or less or 20 ⁇ m or less.
  • the thickness of the base film may be 50 ⁇ m or more or 70 ⁇ m or more, and may be 200 ⁇ m or less or 150 ⁇ m or less.
  • the reflective polarizing film may have a thickness of 50 ⁇ m or more or 70 ⁇ m or more, and may be 200 ⁇ m or less or 150 ⁇ m or less.
  • the thickness of the buffer film may be 50 ⁇ m or more or 70 ⁇ m or more, and may be 200 ⁇ m or less or 150 ⁇ m or less.
  • the reflective polarizing film may have a thickness of 50 ⁇ m to 200 ⁇ m
  • the buffer film may have a thickness of 50 ⁇ m to 200 ⁇ m
  • the prism sheet may have a thickness of 50 ⁇ m to 350 ⁇ m.
  • the functional coating layer may have a thickness of 3 ⁇ m to 30 ⁇ m.
  • Components of the optical composite sheet described above may be disposed in the light path.
  • components of the optical composite sheet may be coupled to each other.
  • the bonding may be direct bonding or indirect bonding through an adhesive layer or the like.
  • the optical composite sheet may include a laminate in which the components are directly or indirectly coupled.
  • the optical composite sheet may include a prism sheet; and a UV curing layer disposed as an outermost layer under the prism sheet, wherein the prism sheet and the UV curing layer may be directly or indirectly bonded to each other.
  • the optical composite sheet may further include a functional coating layer inserted between the prism sheet and the UV curing layer, and the prism sheet, the functional coating layer, and the UV curing layer are directly or indirectly bonded to each other. It can be.
  • the optical composite sheet may include a reflective polarizing film disposed on the prism sheet; and a functional coating layer disposed on the reflective polarizing film, wherein the reflective polarizing film may include two or more types of thin films having different optical properties in a stacked form.
  • the optical composite sheet may further include a buffer film between the reflective polarizing film and the prism sheet. The reflective polarizing film, the buffer film, the prism sheet, and the functional coating layer may be directly or indirectly bonded to each other.
  • the optical composite sheet may include two or more prism sheets, and specifically, the prism sheet may include a first prism sheet and a second prism sheet. Patterns of the first prism sheet and the second prism sheet may be identical to or different from each other.
  • the prism sheet may include a first prism sheet including a first prism pattern extending in a first direction in a plane; and a second prism sheet including a second prism pattern extending in a second direction within a plane crossing the first direction.
  • grain directions of the patterns of the first prism sheet and the second prism sheet may be orthogonal to each other. More specifically, the first prism sheet may be a horizontal prism sheet, and the second prism sheet may be a vertical prism sheet, or vice versa.
  • the pattern layer of the first prism sheet and the pattern layer of the second prism sheet may both face the same direction or face different directions.
  • Optical performance may be improved by adjusting the position of the prism sheet (in particular, the relative position between the prism pattern layer and other elements) within the optical composite sheet.
  • the prism sheet may include a first prism sheet; and a second prism sheet disposed on the first prism sheet, wherein the first prism sheet includes a first substrate layer and a first prism pattern layer disposed on the first substrate layer, 2
  • the prism sheet may include a second substrate layer and a second prism pattern layer disposed on the second substrate layer.
  • the first prism sheet may be disposed rearward than the second prism sheet based on a front side from which incident light is emitted from the optical composite sheet.
  • the first prism pattern layer may extend in a first in-plane direction
  • the second prism pattern layer may extend in a second in-plane direction crossing the first direction.
  • the optical composite sheet further includes a first functional coating layer disposed under the first prism sheet, and a second functional coating layer disposed on the second prism sheet, wherein the first functional coating layer and the second functional coating layer are selected from the group consisting of a light diffusion layer, an anti-split layer, a heat-resistant coating layer, and a hard coating layer, respectively, and the first functional coating layer, the first prism sheet, the second prism sheet, and the second functional coating layer are directly or indirectly connected to each other.
  • the optical composite sheet further includes a reflective polarizing film disposed between the second prism sheet and the second functional coating layer, and a buffer film disposed between the second prism sheet and the reflective polarizing film, and the reflective polarizing film disposed between the second prism sheet and the reflective polarizing film.
  • the film may have a structure in which 100 to 2000 layers of first resin layers and second resin layers having different optical properties are alternately laminated.
  • a UV curing layer 100 including a light absorber may be disposed below the prism sheets 210 and 220 .
  • color deviation depending on the viewing angle can be minimized. .
  • the prism sheet may include a first prism sheet including a first prism pattern extending in a first direction; and a second prism sheet including a second prism pattern extending in a second direction crossing the first direction, wherein the first prism sheet is disposed under the second prism sheet, and the first prism sheet is disposed below the second prism sheet.
  • a UV curing layer may be disposed under the sheet as an outermost layer.
  • FIG. 5 shows a cross-sectional view of an optical composite sheet according to an embodiment.
  • FIG. 5 is a cross-sectional view of the optical composite sheet of Example 1, and as shown in FIG. 5, the optical composite sheet 11 includes a light diffusion layer 320, a base film 350, and a second prism sheet. 220, a first prism sheet 210, and a UV curing layer 100 including a light absorber in that order, and adhesive layers 610 and 620 may be formed therebetween.
  • the optical composite sheet 11 includes a second prism sheet 220, a first prism sheet 210, and a UV curing layer 100 including a light absorber in that order.
  • An adhesive layer 610 may be formed between the second prism sheet 220 and the first prism sheet 210 .
  • the optical composite sheet 11 includes a light diffusion layer 320, a reflective polarizing film 400, a buffer film 500, a second prism sheet 220, and a first prism. It may include a sheet 210, and a UV curing layer 100 including a light absorber in that order, and adhesive layers 610, 620, and 630 may be formed therebetween.
  • the optical composite sheet 11 may include a first prism sheet 210 and a UV curing layer 100 including a light absorber in that order.
  • a light absorber may be included in an additional UV cured layer, or a light absorber may be further included in a layer formed by UV curing in an existing laminated structure.
  • the color gamut of the display device including the optical composite sheet according to the embodiment may be improved compared to the conventional one.
  • a color gamut means a color gamut that can be reproduced by each medium in the entire light gamut.
  • color gamut evaluation of any medium obtains a triangle composed of RGB three points from CIE (Commission Internationale de L'eclairage) chromaticity coordinates, and obtains a triangle composed of RGB three points, This is done by comparing
  • Chromaticity means a property of color other than brightness
  • CIE 1976 chromaticity coordinate u'v' is a method that can be expressed closest to the color perceived by humans.
  • FIG. 18 shows a method of calculating a color gamut from CIE 1931 chromaticity coordinates xy.
  • a first color gamut (CG1) as a reference within the entire color gamut (CG) of chromaticity coordinates is drawn, and the coordinates of red (R), green (G), and blue (B) measured from the sample.
  • the second color region CG2 which is a triangle having as a vertex, the area of the overlapping color region CG0 between them is obtained. Then, the color gamut of the sample can be measured by calculating the ratio between the areas of these regions.
  • a triangle of the reference DCI color gamut (first color gamut) is drawn, and the color gamut measured from the sample (second color gamut) is drawn.
  • the DCI area ratio may be calculated by drawing a triangle of the color gamut and calculating the percentage (%) of the area of the second color gamut to the area of the first color gamut.
  • a DCI overlapping ratio may be obtained by calculating a percentage (%) of an area of the overlapping color gamut with respect to an area of the first color gamut.
  • the display device including the optical composite sheet may have a DCI area ratio of 80% or more in CIE 1931 chromaticity coordinates xy, and specifically, 85% or more, 90% or more, or 95% or more.
  • the display device including the optical composite sheet may have a DCI overlap ratio of 80% or more in CIE 1976 chromaticity coordinates u'v', and specifically, 85% or more, 90% or more, or 95% or more.
  • the display device including the optical composite sheet has a DCI overlap ratio of 90% or more in CIE 1976 chromaticity coordinates u'v', 250 cd/m 2 or more, 260 cd/m 2 or more, or It may exhibit luminance of 270 cd/m 2 or more.
  • the display device including the optical composite sheet has little change in chromaticity coordinate values according to viewing angles, and thus can effectively reduce color deviation according to viewing angles.
  • the display device including the optical composite sheet may have a value of ⁇ u'v'(60D) of 0.015 or less, more specifically 0.012 or less, 0.01 or less, or 0.007 or less according to Equation (A) below. .
  • Equation (A) u'0 and u'60 are CIE 1976 chromaticity coordinates u' values measured from the front of the display device and at an angle of 60°, respectively, and v'0 and v'60 are respectively the front and 60° values of the display device. CIE 1976 chromaticity coordinate v' value measured in degrees.
  • values of ⁇ u'v'(-60D) obtained by measuring the display device from the front side and at an angle of -60° in the same manner are also 0.015 or less, 0.012 or less, or 0.01 or less, or 0.007 or less.
  • the optical composite sheet has excellent absorption selectivity for light in a specific wavelength band by including a light absorber, specifically an organic dye, in the UV curing layer. Accordingly, the transmission spectrum curve of the optical composite sheet may exhibit a narrow and deep valley at a specific wavelength in the visible light band.
  • a pigment or phosphor other than an organic dye is used as the light absorber, it is difficult to achieve such selective absorption of light of a specific wavelength.
  • the organic dye is uniformly dissolved in a solvent and added to the UV curing layer, wavelength absorption selectivity may be very excellent, and luminance deterioration may be minimized because it hardly absorbs other wavelengths.
  • a pigment or phosphor is used as a light absorber, since it is dispersed without being dissolved in a solvent, absorption selectivity for a specific wavelength is low, so it is not suitable for use in improving a color gamut.
  • the spectrum curve (i.e., the horizontal axis is the wavelength and the vertical axis is the net absorbance) In graph), the main absorption peak may appear very sharp and narrow.
  • FIG. 19 shows a transmission spectrum of an optical composite sheet according to an embodiment.
  • FIG. 19 is a transmission spectrum of an optical composite sheet having a UV coating layer containing a light absorber as an outermost layer and an optical composite sheet in which only the light absorber is removed from the UV coating layer as a reference example (Comparative Example 1) according to an embodiment. is shown exemplarily.
  • the transmission spectrum curve of the optical composite sheet of one embodiment shows a narrow and deep valley at a specific wavelength in the visible light band due to the organic dye contained in the UV curing layer.
  • the transmission spectrum curve appears flat at all wavelengths in the visible light band.
  • FIG. 20 shows a net absorbance of an optical composite sheet according to an embodiment.
  • FIG. 20 shows a value obtained by subtracting the transmittance of the example from the transmittance of the reference example for each wavelength, that is, the net absorbance by the organic dye, and then shows it as a spectrum curve.
  • the highest height (h) of the peak (pointed peak) of the net absorbance is about 10% to 12%, and the height (1/2 h) corresponding to 1/2 thereof is about 5% to 6%
  • the peak width (w) at that height that is, the full width at half maximum (FWHM), was measured to be within about 50 nm.
  • the optical composite sheet according to one embodiment has a very narrow half-width of the peak of 50 nm or less in the net absorbance spectrum, so the absorption selectivity of the wavelength is very high.
  • the optical composite sheet may satisfy the following formula (1).
  • FWHM is the full width at half maximum (nm) of the maximum peak in the spectral curve of the net absorbance according to the wavelength
  • a light source is prepared to measure the net absorbance
  • the optical composite sheet A first transmittance T1 is measured, a reference sheet in which only the light absorber is removed from the optical composite sheet is prepared, and light from the light source is passed through the reference sheet to obtain a second transmittance T0. measured, and the net absorbance is a value obtained by subtracting the first transmittance T1 from the second transmittance T0.
  • the FWHM value of Equation (1) may be 0 nm to 50 nm, or 10 nm to 40 nm.
  • the maximum peak in the net absorbance spectrum may appear in a first absorption wavelength band, where the first absorption wavelength band may be 500 nm to 700 nm, specifically 550 nm to 650 nm.
  • the height of the maximum peak in the spectral curve of the net absorbance may be 5% or more, for example, 10% or more, specifically 5% to 50%, or 10% to 30%.
  • the light source used to measure the net absorbance may be a light source emitting white light having a continuous emission spectrum.
  • a display device includes a light source, a display panel, and an optical composite sheet.
  • the display panel displays an image by receiving light from the light source.
  • the optical composite sheet is disposed in a light path from the light source to the display panel.
  • the display device includes a light source; an optical composite sheet into which light is incident from the light source; and a display panel into which light is incident from the optical composite sheet.
  • Light from the light source is improved in characteristics while passing through the optical composite sheet, and the display panel displays an image using the light having the improved characteristics.
  • FIG. 17 illustrates a display device and a traveling direction of light according to an exemplary embodiment.
  • the display device 1 includes a backlight unit 10; and a display panel 20 disposed on the backlight unit 10 .
  • the backlight unit 10 includes an optical composite sheet 11; and a diffusion plate or a light guide plate 700, and may further include a light source 900.
  • the light source may be disposed on a side of the light guide plate or below the diffusion plate.
  • the diffusion plate or light guide plate 700 is disposed under the optical composite sheet 11 to diffuse or transfer light generated from the light source 900 to the display panel 20 .
  • the light guide plate 700 is used in the case of an edge type light source, and at this time, the reflector 800 is disposed under the light guide plate 700 to reduce light loss.
  • the diffusion plate is used in the case of a direct light source, and light efficiency can be improved by using an LED planar light source.
  • an edge type light source referring to FIG. 16 , light generated from the light source 900 is incident on the side surface of the light guide plate 700 and is reflected by the reflector 800 to enter the lower portion of the optical composite sheet 11 .
  • the incident light passes vertically through the optical composite sheet 11 and exits upward.
  • the light emitted from the top of the optical composite sheet 11 is incident on the display panel 20, and as a result, an image may be displayed on the screen of the display panel.
  • the light source may be a white light source.
  • the light source may have a continuous emission spectrum.
  • the light source may be a white LED.
  • the light source may include a blue GaN (Gallium Nitride) light emitting chip and a yellow YAG (Yttrium Aluminum Garnet, Y 3 Al 5 O 12 ) phosphor.
  • the light source may include a blue GaN (Gallium Nitride) light emitting chip and r, g phosphor, or may include an r phosphor and a red KSF (K 2 SiF 6 :Mn) phosphor.
  • the display panel 20 may include a liquid crystal cell and one or more polarizing plates, and as a specific example, may have a structure in which a first polarizing plate, a liquid crystal cell, and a second polarizing plate are stacked, and an adhesive layer is provided between the polarizing plate and the liquid crystal cell. can be formed.
  • the display device 1 may further include a cover window 30 disposed on the display panel 20 .
  • the cover window may be a transparent plastic substrate or a glass substrate, and specifically may be a transparent polyimide film or ultra-thin glass (UTG).
  • the display device 1 may further include an electrode and a substrate connected to the display panel 20 .
  • the liquid crystal display device 1 may include frames 51 and 52 that surround and protect these components.
  • a UV curable composition was prepared by mixing the following components.
  • UV curable resin polyurethane acrylate resin (100% solid content)
  • UV blocker Tinuvin 928, manufactured by BASF
  • Step 1) The composition of Preparation Example 1 was coated on one side of a substrate layer (PET film) having a thickness of 100 ⁇ m using a Mayer bar, and dried and UV cured to form a UV cured layer having a thickness of 5 ⁇ m.
  • the UV curing was performed by irradiating UV light in a chamber in which liquid nitrogen was vaporized and the oxygen concentration was adjusted to about 5% by volume.
  • a first prism pattern having a thickness of about 40 ⁇ m was formed on the other surface of the first base layer to prepare a first prism sheet.
  • Step 2 A second prism sheet was prepared by forming a second prism pattern layer having a thickness of about 40 ⁇ m on one side of a second substrate layer (PET film) having a thickness of 100 ⁇ m.
  • the other side of the second substrate layer was coated with an adhesive to a thickness of 0.5 to 1.0 ⁇ m using a Mayer bar, and attached to the surface of the first prism pattern layer of the previously prepared first prism sheet.
  • Step 3 After preparing a composition in which 15 parts by weight of polymethyl methacrylate (PMMA) beads, 35 parts by weight of acrylic binder resin, and 50 parts by weight of methyl ethyl ketone (MEK) as a solvent are mixed, a third substrate having a thickness of 100 ⁇ m
  • PMMA polymethyl methacrylate
  • MEK methyl ethyl ketone
  • An adhesive was coated on the other surface of the third substrate layer to a thickness of 0.5 ⁇ m to 1.0 ⁇ m using a Mayer bar, and attached to the surface of the second prism pattern layer of the previously prepared second prism sheet.
  • the UV curing layer/first substrate layer/first prism pattern layer/adhesive layer/second substrate layer/second prism pattern layer/adhesive layer/third substrate layer/light diffusion layer are formed from the bottom as shown in FIG. A composite sheet was obtained.
  • Step 1) Light absorbing layer composition (100 parts by weight of a solution in which acrylic binder resin (AOF-2914, Aekyung) and propylene glycol methyl ether (PGME) are mixed in a weight ratio of 30:70, light absorber (PANAX NEC 584, Woosung Chemical) 0.05 part by weight of the composition) was coated on one surface of the first substrate layer (PET) having a thickness of 125 ⁇ m, and then dried and cured by heat to form a light absorbing coating layer having a thickness of 3 ⁇ m.
  • acrylic binder resin OAF-2914, Aekyung
  • PGME propylene glycol methyl ether
  • Step 2 After preparing a composition in which 15 parts by weight of polybutyl methacrylate (PBMA) beads, 35 parts by weight of UV curable urethane acrylate resin, and 50 parts by weight of methyl ethyl ketone (MEK) as a solvent are mixed, the light absorbing coating layer
  • the surface was coated and dried using a Mayer bar to form a back coating layer having a thickness of about 5 ⁇ m.
  • a first prism pattern layer having a thickness of about 40 ⁇ m was prepared by coating a UV curable resin on the other surface of the first base layer and UV curing while forming a prism pattern using a master roll having a pattern on the surface.
  • Step 3) A second prism sheet was prepared by forming a second prism pattern layer having a thickness of about 40 ⁇ m on one side of a second substrate layer (PET film) having a thickness of 100 ⁇ m. An adhesive was coated on the other side of the second substrate layer to a thickness of 0.5 ⁇ m to 1.0 ⁇ m using a Mayer bar, and attached to the surface of the first prism pattern layer of the previously prepared first prism sheet.
  • PET film second substrate layer having a thickness of 100 ⁇ m.
  • An adhesive was coated on the other side of the second substrate layer to a thickness of 0.5 ⁇ m to 1.0 ⁇ m using a Mayer bar, and attached to the surface of the first prism pattern layer of the previously prepared first prism sheet.
  • Step 4) After preparing a composition in which 15 parts by weight of polymethyl methacrylate (PMMA) beads, 35 parts by weight of acrylic binder resin, and 50 parts by weight of methyl ethyl ketone (MEK) as a solvent are mixed, a third substrate having a thickness of 100 ⁇ m
  • PMMA polymethyl methacrylate
  • MEK methyl ethyl ketone
  • the composition was coated on one surface of the layer (PET film) using a Mayer bar and dried to form a light diffusion layer having a thickness of about 10 ⁇ m.
  • the other surface of the third substrate layer was coated with an adhesive to a thickness of 0.5 to 1.0 ⁇ m using a Mayer bar, and attached to the surface of the second prism pattern layer of the previously prepared second prism sheet.
  • liquid crystal display device 55-inch LED direct type, 220V, LG Electronics
  • an optical film reflective polarizing film, prism sheet, etc. located on the rear surface of the liquid crystal display panel was removed, and an optical composite sheet was placed there.
  • Test Example 1 transmittance, transmitted color and haze
  • the optical composite sheet was put into a spectrophotometer (CM-3700A, Konica Minolta Co., Ltd., light source D65) and transmittance and transmitted color were measured.
  • the haze of the optical composite sheet was measured using a haze meter (NDH2000, Nippon Denshoku). It is preferable that the total light transmittance is about 84.5% to 90.5%, the transmittance at a wavelength of 594 nm is about 75% to 79%, and the haze is about 5.0% or less.
  • x is preferably 0.30 to 0.31 and y is about 0.31 to 0.32.
  • Test Example 2 Relative luminance, color coordinates and DCI overlap ratio
  • a solvent methyl ethyl ketone or ethanol
  • the soaked gauze was wiped 10 times. Thereafter, the surface of the gauze was visually checked, and it was evaluated as good when the organic dye did not come out.
  • Example 1 Comparative Example 1 total thickness ⁇ m 391.7 394.8 optics complex Sheet total light transmittance % 87.6 88.4 Transmission color coordinates (D65) x - 0.306 0.307 y - 0.313 0.314 Transmittance (@594 nm) % 76.9 79.4 Transmittance (@360 nm) % 82.7 25.8 haze % 1.3 3.02 mark Device relative luminance % 101.2 100 chromaticity coordinate x - 0.2745 (-0.0004) 0.2749 chromaticity coordinate y - 0.2806 (+0.0009) 0.2797 DCI overlap ratio % 86.5 86.9
  • Example 1 had a smaller total thickness than Comparative Example 1, and was excellent in both color gamut and luminance. From this, it can be seen that the organic dye in the UV curing layer of the optical composite sheet of Example 1 is contained without being deteriorated during the UV curing process. In addition, as shown in Table 2, Example 1 was evaluated well in both crosshatch and swelling tests, whereas Comparative Example 2 was evaluated poorly. From this, it can be seen that if the oxygen concentration during UV curing is not adjusted, the curing degree is low and cannot function as the outermost layer.
  • Example 1 and Comparative Example 1 were put into a spectrophotometer (CM-3700A, Konica Minolta Co., Ltd., light source D65), and transmission spectra were measured, respectively, and the results are shown in FIG. 19 .
  • 21 shows transmission spectra of the optical composite sheets of Example 1 and Comparative Example 1. As shown in FIG. 21, compared to the transmission spectrum of Example 1 in which a single UV curing layer containing an organic dye was formed on the rear surface of the first substrate layer, a light absorbing coating layer was separately formed on the rear surface of the first substrate layer and a UV curing layer was formed. It was confirmed that the transmission spectrum of Comparative Example 1 obtained by overcoating the cured layer was similarly obtained. Through this, it can be seen that it is possible to provide an optical composite sheet in which a decrease in luminance due to light absorption is minimized while improving a color gamut through a simpler manufacturing process than in the prior art.
  • Example 22 shows transmission spectra of the optical composite sheets of Example 1 and Comparative Example 3.
  • the optical sheets of Example 1 and Comparative Example 3 were put into a spectrophotometer (CM-3700A, Konica Minolta Co., Inc., D65 light source), and transmission spectra were measured, respectively, and the results are shown in FIG. 22 .
  • CM-3700A Konica Minolta Co., Inc., D65 light source

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Abstract

Une feuille optique composite selon un mode de réalisation comprend une feuille prismatique et une couche de durcissement aux UV, la couche de durcissement aux UV étant disposée en tant que couche la plus à l'extérieur sur une surface de la feuille de prisme, la couche de durcissement aux UV comprenant un absorbeur de lumière qui absorbe sélectivement la lumière d'une bande de longueur d'onde spécifique, et l'absorbeur de lumière comprenant un ou plusieurs types de colorant organique. La feuille optique composite selon le mode de réalisation est appliquée à une unité de rétroéclairage d'un dispositif d'affichage tel qu'un LCD, et peut ainsi améliorer les performances.
PCT/KR2022/009308 2021-07-01 2022-06-29 Feuille optique composite et dispositif d'affichage la comprenant WO2023277569A1 (fr)

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KR20140111947A (ko) * 2013-03-12 2014-09-22 다우 글로벌 테크놀로지스 엘엘씨 에폭시 수지 조성물, 그의 제조방법 및 이를 사용한 물품
KR101799975B1 (ko) * 2014-10-31 2017-11-21 에스케이씨하이테크앤마케팅(유) 액정표시장치용 색순도 향상 및 휘도 보상 필름 및 이를 포함하는 액정표시장치
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