WO2022010179A1 - Film optique, lame polarisante le comprenant et dispositif d'affichage optique les comprenant - Google Patents

Film optique, lame polarisante le comprenant et dispositif d'affichage optique les comprenant Download PDF

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Publication number
WO2022010179A1
WO2022010179A1 PCT/KR2021/008351 KR2021008351W WO2022010179A1 WO 2022010179 A1 WO2022010179 A1 WO 2022010179A1 KR 2021008351 W KR2021008351 W KR 2021008351W WO 2022010179 A1 WO2022010179 A1 WO 2022010179A1
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Prior art keywords
optical film
optical
polymer
substrate
refractive index
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PCT/KR2021/008351
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English (en)
Korean (ko)
Inventor
김진우
심대섭
정용운
오영
Original Assignee
삼성에스디아이 주식회사
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Publication of WO2022010179A1 publication Critical patent/WO2022010179A1/fr

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G02B5/3083—Birefringent or phase retarding elements
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
    • G02B5/3033—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid
    • G02B5/3041—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid comprising multiple thin layers, e.g. multilayer stacks
    • G02B5/305—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid comprising multiple thin layers, e.g. multilayer stacks including organic materials, e.g. polymeric layers
    • 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
    • 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
    • G02F1/133528—Polarisers
    • 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
    • G02F2201/00—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00
    • G02F2201/08—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00 light absorbing layer

Definitions

  • the present invention relates to an optical film, a polarizing plate including the same, and an optical display device including the same. More specifically, the present invention is an optical film that improves the contrast ratio from the side, improves visibility and viewing angle, increases manufacturing processability and economic feasibility, and improves the contrast ratio at the front, a polarizing plate including the same, and optical including the same It is about the display device.
  • the liquid crystal display operates by emitting light from the backlight unit through the liquid crystal panel. Therefore, the color of the front of the screen of the liquid crystal display is good. However, on the side of the screen of the liquid crystal display, there was a problem in that color and contrast ratio compared to the front were deteriorated.
  • the optical film for improving contrast or visibility is formed by forming an optical pattern having a predetermined cross section at the interface of two layers having different refractive indices.
  • the contrast ratio or visibility improvement effect is provided through the refractive index difference and light refraction through the cross section of the optical pattern.
  • the conventional optical film has to have a predetermined width and pitch, there has been a limitation in the processing of the optical pattern.
  • a resin layer was coated on a base film and manufactured by a soft mold method, so the yield was low due to the end portion of the optical film.
  • the polarizer and the optical film are laminated in a roll-to-roll manner, there is a limitation in the winding amount due to the occurrence of depressions occurring at the end of the optical film or an increase in the winding amount, so the production yield of the polarizing plate was low.
  • An object of the present invention is to provide an optical film capable of increasing the contrast ratio in the side without having an optical pattern.
  • Another object of the present invention is to provide an optical film capable of improving visibility by widening a viewing angle from the side without having an optical pattern.
  • Another object of the present invention is to provide an optical film capable of improving yield and processability without an end treatment problem due to an optical pattern when laminating a polarizer and a roll-to-roll.
  • Another object of the present invention is to provide an optical film capable of increasing the contrast ratio in the front.
  • One aspect of the present invention is an optical film.
  • the optical film includes an optical functional layer, wherein the optical functional layer includes a substrate and a plurality of polymers dispersed inside the substrate, wherein the plurality of polymers is a total number of 50 to 220 layers in a thickness direction of the substrate and an average length of the plurality of major axes of the polymer is 2.5 mm to 5 mm, an average length of the minor axes of the plurality of polymers is 150 nm to 400 nm, and the thickness of the optical functional layer is 5 ⁇ m to 60 ⁇ m.
  • the optical film may have a polarization degree of about 10% or less.
  • the optical function layer may be a contrast improvement layer or a visibility improvement layer.
  • the substrate may be an optically isotropic continuous phase and the polymer may be an optically anisotropic dispersed phase.
  • the refractive index of the polymer is greater than the refractive index of the substrate, and the difference between the refractive index of the polymer and the refractive index of the substrate may be about 0.2 or more.
  • the difference between the refractive index of the polymer in the x-axis direction and the refractive index of the substrate in the x-axis direction may be about 0.2 or more.
  • the difference between the refractive index of the substrate in the y-axis direction and the refractive index of the polymer in the y-axis direction may be about 0.1 or less.
  • the difference between the refractive index in the z-axis direction of the substrate and the refractive index in the z-axis direction of the polymer may be about 0.1 or less.
  • the polymer may not be present on the outermost surface of the optical functional layer.
  • the polymer may be at least one of rod-shaped, rod-shaped, rod-shaped, and plate-shaped.
  • the polymer may be dispersed in a random form within the layer.
  • the plurality of polymers may be alternately arranged with each other.
  • a protective layer may be further formed on one or both surfaces of the optical functional layer.
  • Another aspect of the present invention is a polarizing plate.
  • the polarizing plate includes a polarizer and the optical film of the present invention laminated on at least one surface of the polarizer.
  • an angle between the absorption axis of the polarizer and the MD of the optical functional layer of the optical film may be about 5° or less.
  • the optical film may be disposed on the light exit surface of the polarizer.
  • Another aspect of the present invention is an optical display device.
  • the optical display device includes the polarizing plate of the present invention.
  • the present invention provides an optical film capable of increasing the contrast ratio from the side without having an optical pattern.
  • the present invention provides an optical film capable of improving visibility by widening a viewing angle from the side without having an optical pattern.
  • the present invention provides an optical film capable of improving yield and processability without a problem of end processing due to an optical pattern when laminating a polarizer and a roll-to-roll.
  • the present invention provides an optical film capable of increasing the contrast ratio in the front.
  • FIG. 1 is a schematic perspective view of an optical film according to an embodiment of the present invention.
  • FIG. 2 is a TD (transverse direction) cross-sectional view of the optical film of FIG. 1 .
  • FIG. 3 is a MD (machine direction) cross-sectional view of the optical film of FIG. 1 .
  • FIG. 5 is a cross-sectional view of a polarizing plate according to an embodiment of the present invention.
  • in-plane retardation (Re) is expressed by the following formula A:
  • nx and ny are the refractive indices of the protective film in the slow axis direction and the fast axis direction, respectively, at a wavelength of 550 nm, and d is the thickness of the protective film (unit: nm)).
  • nx is the refractive index in the x-axis direction
  • ny is the refractive index in the y-axis direction
  • nz is the refractive index in the z-axis direction.
  • (meth)acryl may mean acryl and/or methacrylic.
  • X to Y when referring to a numerical range means X or more and Y or less (X ⁇ and ⁇ Y).
  • the present inventors improved the contrast ratio (contrast ratio) in both the front and the side, and provided the effect of improving visibility, as well as providing an optical film that improved manufacturing process and economic feasibility.
  • the term “side” refers to a direction of 30° to 60°, preferably 60° when the front is 0°.
  • FIGS. 1, 2, 3, and 4 an optical film of an embodiment of the present invention will be described with reference to FIGS. 1, 2, 3, and 4 .
  • FIG. 1 is a perspective view of an optical film according to an embodiment of the present invention.
  • FIG. 2 is a TD cross-sectional view of the optical film of FIG. 1 .
  • FIG. 3 is an MD cross-sectional view of the optical film of FIG. 1 .
  • FIG. 4 is a cross-sectional view of the polymer of FIG. 1 , showing a length (a) in a major axis direction and a length (b) in a minor axis direction.
  • the major axis direction is the same as the TD of the optical film
  • the minor axis direction is the same as the MD or thickness direction of the optical film.
  • the optical function layer 100 may be manufactured by uniaxial stretching.
  • the stretched direction during the manufacture of the optical functional layer was defined as the MD of the optical film.
  • MD of the optical film is the same as MD of the optical function layer
  • TD of the optical film is in the same direction as TD of the optical function layer.
  • the optical film 10 includes an optical function layer 100 , a first protective layer 200 , and a second protective layer 300 .
  • a first protective layer 200 and a second protective layer 300 are laminated on one surface and the other surface of the optical function layer 100 , respectively.
  • the optical film 10 may have a thickness of about 100 ⁇ m to about 300 ⁇ m, preferably about 100 ⁇ m to about 150 ⁇ m. Within the above range, it can be used for a polarizing plate.
  • the optical function layer 100 has a thickness of 5 ⁇ m to 60 ⁇ m. In the above range, when the optical film is applied to the polarizing plate, it may help to provide the effect of improving the contrast ratio and visibility.
  • the optical function layer 100 has a thickness of, for example, 5 ⁇ m, 10 ⁇ m, 15 ⁇ m, 20 ⁇ m, 25 ⁇ m, 30 ⁇ m, 45 ⁇ m, 40 ⁇ m, 45 ⁇ m, 50 ⁇ m, 55 ⁇ m or It may be 60 ⁇ m, 20 ⁇ m to 60 ⁇ m, or 5 ⁇ m to 30 ⁇ m.
  • the optical function layer 100 includes a substrate 110 and a plurality of polymers 120 dispersed in the substrate 110 .
  • the “dispersion” means that at least about 95% or more, preferably, about 95% to about 100% of the total polymer 120 included in the substrate 110 is spaced apart from each other.
  • the average length of the major axis of the plurality of polymers 120 is 2.5 mm to 5 mm, and the average length of the minor axis is 150 nm to 400 nm.
  • the average length of the major axis is, for example, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 3mm to 5mm
  • the average length of the minor axis is, for example, 150nm, 200nm, 250nm, 300nm, 350nm, 400 nm, 200 nm to 350 nm.
  • the average length of the long axis may be a value obtained by dividing the total sum of the lengths of the long axes of the polymers included in the optical functional layer by the number of polymers.
  • the average length of the minor axis may be a value obtained by dividing the sum of the lengths of the minor axis of the polymer included in the optical functional layer by the number of polymers.
  • the polymer 120 may be divided into a long axis (a) and a short axis (b).
  • the length of the major axis (a) may be about 2.5 mm to about 5 mm, and the length of the minor axis (b) may be about 150 nm to about 400 nm. In the above range, the average length of the major axis and the average length of the minor axis of the present invention can be easily reached.
  • the plurality of polymers 120 are included in layers in the thickness direction of the substrate 110 inside the substrate 110, and the total number of layers arranged in the thickness direction is 50 to 220.
  • the total number of layers is, for example, 50, 60, 70, 80, 90, 100, 110, 120, 130, 140, 150, 160, 170, 180, 190, 200, 210, 220, 50 to 210, 50 to 200, 50 to 100.
  • the optical functional layer 100 may be manufactured by simultaneously stretching the substrate 110 and the polymer 120 .
  • the substrate 110 and the polymer 120 have nx, which is a refractive index in the x-axis direction, ny, which is a refractive index in the y-axis direction, and nz, which is a refractive index in the z-axis direction, respectively, and at least one of them is different from each other.
  • the “x-axis direction” is defined as the MD of the optical film
  • the “y-axis direction” is defined as the TD of the optical film
  • the “z-axis direction” is defined as the thickness direction of the optical film.
  • the polymer 120 may have a different refractive index relative to the substrate 110 in at least one of the x-axis, y-axis, and z-axis direction. Through this, the substrate 110 and the polymer 120 form a birefringent interface to perform various functions with respect to light incident on the optical film.
  • the present invention includes a plurality of polymers having the length of the major axis and the length of the minor axis in the specific range described above, but the total number of layers in which the polymer is arranged in the thickness direction is 50 to 220, thereby improving the contrast ratio and improving visibility.
  • the reflective polarization function of transmitting some of the light incident from the outside and reflecting some of the light is increased, so that the effect of improving the contrast ratio may be weak. If the total number of layers is less than 50, there may be a problem in that the effect of improving visibility is reduced.
  • the optical film of the present invention does not have a reflective polarization function, and the optical film has a polarization degree of about 10% or less, for example, about 0%, 1%, 2%, 3%, 4%, 5%, 6%, 7 %, 8%, 9%, or 10%, such as from about 0% to about 10%, from about 1% to about 10%.
  • the degree of polarization may be measured, for example, at a wavelength in the visible region by a conventional method known to those skilled in the art.
  • the optical function layer 100 may be a contrast improvement layer or a visibility improvement layer.
  • the substrate 110 and the polymer 120 have different refractive indices in the x-axis direction, nx of the polymer 120 is greater than nx of the substrate 110, and nx of the polymer 120 and the substrate ( 110) may have a difference of nx of about 0.2 or more, preferably about 0.2 to about 0.3. In the above range, it is possible to provide an effect of improving the visibility of the optical film.
  • the difference between the ny of the substrate 110 and the ny of the polymer 120 may be about 0.1 or less, more preferably about 0 to about 0.1, and most preferably 0. Within the above range, the effect of improving the visibility of the optical film may be increased.
  • the difference between the nz of the substrate 110 and the nz of the polymer 120 may be about 0.1 or less, more preferably about 0 to about 0.1, and most preferably 0. It is possible to enhance the effect of improving the visibility of the optical film.
  • the substrate 110 is an optically isotropic continuous phase, and nx is about 1.55 to about 1.70, for example, about 1.55, 1.56, 1.57, 1.58, 1.59, 1.60, 1.61, 1.62, 1.63, 1.64, 1.65, 1.66, 1.67.
  • ny is about 1.55 to about 1.70, for example about 1.55, 1.56, 1.57, 1.58, 1.59, 1.60, 1.61, 1.62, 1.63, 1.64, 1.65 , 1.66, 1.67, 1.68, 1.69, 1.70, preferably from about 1.55 to about 1.65, nz is from about 1.55 to about 1.70, such as about 1.55, 1.56, 1.57, 1.58, 1.59, 1.60, 1.61, 1.62, 1.63 , 1.64, 1.65, 1.66, 1.67, 1.68, 1.69, 1.70, preferably from about 1.55 to about 1.65. In the above range, there may be a visibility effect.
  • Polymer 120 is an optically anisotropic dispersed phase, wherein nx is about 1.55 to about 1.95, for example, about 1.55, 1.56, 1.57, 1.58, 1.59, 1.60, 1.61, 1.62, 1.63, 1.64, 1.65, 1.66, 1.67, 1.68, 1.69, 1.70, 1.71, 1.72, 1.73, 1.74, 1.75, 1.76, 1.77, 1.78, 1.79, 1.80, 1.81, 1.82, 1.83, 1.84, 1.85, 1.86, 1.87, 1.88, 1.89, 1.90, 1.91, 1.92, 1.93, 1.94, 1.95, preferably about 1.55 to about 1.90, ny is about 1.55 to about 1.70, such as about 1.55, 1.56, 1.57, 1.58, 1.59, 1.60, 1.61, 1.62, 1.63, 1.64, 1.65, 1.66, 1.67, 1.68, 1.69, 1.70, preferably about 1.55 to about 1.65, nz is about 1.55 to about 1.70, for example about 1.55, 1.56, 1.
  • the refractive index of the polymer 120 is greater than that of the substrate 110, and the refractive index difference is about 0.2 or more, for example, about 0.2, 0.21, 0.22, 0.23, 0.24, 0.25, 0.24, 0.25, 0.26, 0.27, 0.28, 0.29, 0.3, preferably from about 0.2 to about 0.3. In the above range, it may help to improve front luminance and contrast ratio and help improve visibility.
  • the polymer 120 may not be present on the outermost surface of the optical functional layer 100 .
  • the present invention improves the visibility and contrast ratio by allowing the light incident on the optical functional layer to be finally emitted through a substrate having a low refractive index compared to the polymer. made it possible
  • the "most surface" of the optical functional layer means an area within 10% of the total thickness from the upper surface of the optical functional layer (the light emitting surface of the optical functional layer).
  • the plurality of polymers 120 are included in a total number of 50 to 220 layers in the thickness direction of the substrate 110 , and as shown in FIG. 2 , each layer is spaced apart from each other.
  • the separation distance (d) between the layers may vary depending on the thickness of the optical functional layer and the total number of layers included in the optical functional layer, but for example, about 0.1 ⁇ m to about 0.3 ⁇ m, preferably about 0.1 ⁇ m to about 0.2 ⁇ m can be Within the above range, it may be easy to implement the optical functional layer of the present invention.
  • the plurality of polymers 120 may be randomly dispersed in one layer. Since the optical function layer of the present invention provides the effect of improving the contrast ratio and visibility by lowering the total number of layers of the polymer compared to the conventional reflective polarizing film, it may be preferable that the polymer 120 is randomly dispersed in one layer. .
  • the plurality of polymers 120 are alternately arranged with each other in the optical functional layer 100 .
  • the "alternating arrangement" is, as shown in FIG. 3, between the center of the cross-section of the polymer 120 included in one layer (first layer) (A) and the center of the immediately neighboring polymer 120. It means that the center of the polymer 120 of the second layer (B) disposed after the first layer is disposed.
  • the polymer 120 may have a predetermined cross-section and a shape in which the length of the major axis is relatively long compared to the length of the minor axis.
  • the polymer 120 may be one or more of a rod shape, a rod shape, a rod shape, and a plate shape, but is not limited thereto.
  • the polymer 120 may have a cross section of at least one of a circular shape, an oval shape, and an oval shape. Desirably, the polymer 120 may be configured to be circular in cross-section or to be elliptical in cross-section. About 90% or more of the total polymer may have a circular cross-section, and about 10% or less may have an elliptical cross-section.
  • Polymer 120 is polyethylene naphthalate (PEN), copolyethylene naphthalate, polyethylene terephthalate, polycarbonate, polycarbonate alloy, polystyrene, heat-resistant polystyrene, polymethyl methacrylate, polybutylene terephthalate, polypropylene, polyethylene , acrylonitrile butadiene styrene, polyurethane, polyimide, polyvinyl chloride, styrene acrylonitrile, ethylene vinyl acetate, polyamide, polyacetal, phenolic, epoxy, urea, melanin, unsaturated polyester, silicone , may be formed of at least one of cycloolefin polymers, but is not limited thereto.
  • the polymer 120 may be formed of polyethylene naphthalate (PEN).
  • the base material 110 is polyester including polyethylene naphthalate, copolyethylene naphthalate, polyethylene terephthalate, polycarbonate, polycarbonate alloy, polystyrene, heat-resistant polystyrene, polymethyl methacrylate, polybutylene terephthalate, poly Propylene, polyethylene, acrylonitrile butadiene styrene, polyurethane, polyimide, polyvinyl chloride, styrene acrylonitrile, ethylene vinyl acetate, polyamide, polyacetal, phenolic, epoxy, urea, melanin, unsaturated polyester It may be formed of at least one of a system, a silicone-based, and a cycloolefin polymer, but is not limited thereto.
  • the substrate 110 may be formed of a mixture of polyester and polycarbonate.
  • the first protective layer 200 and the second protective layer 300 may be respectively formed on one surface and the other surface of the optical functional layer 100 to protect the optical functional layer 100 and to facilitate optical film manufacture. . Although not particularly limited, the first protective layer 200 and the second protective layer 300 may be directly formed on the optical functional layer 100 without an additional adhesive layer or an adhesive layer, respectively.
  • FIG. 1 illustrates an optical film having both a first protective layer 200 and a second protective layer 300 manufactured. However, if the mechanical strength of the substrate 110 is sufficient or the optical film can be manufactured even without the first protective layer and the second protective layer, at least one of the first protective layer and the second protective layer may be omitted.
  • the first protective layer 200 and the second protective layer 300 may be formed of the same or different types of resin.
  • the first protective layer 200 and the second protective layer 300 may include polyester, polycarbonate, polycarbonate alloy, polystyrene, and heat resistance including polyethylene naphthalate, copolyethylene naphthalate, and polyethylene terephthalate.
  • Polystyrene polymethyl methacrylate, polybutylene terephthalate, polypropylene, polyethylene, acrylonitrile butadiene styrene, polyurethane, polyimide, polyvinyl chloride, styrene acrylonitrile, ethylene vinyl acetate, polyamide, polyacetal, It may be formed of at least one of phenol-based, epoxy-based, urea-based, melanin-based, unsaturated polyester-based, silicone-based, and cycloolefin-based polymer-based polymers, but is not limited thereto.
  • the first protective layer 200 and the second protective layer 300 may have the same or different thicknesses.
  • each of the first protective layer 200 and the second protective layer 300 may have a thickness of about 10 ⁇ m to about 100 ⁇ m. Within the above range, it can be used for optical films.
  • the optical film of this embodiment may be manufactured in consideration of a conventional method of manufacturing a film including a polymer.
  • the optical film may be manufactured by the apparatus described in Korean Patent No. 10-1930551 or the like.
  • the optical film of the present invention may be manufactured by adjusting the discharge amount to about 2.0 kg/hr to about 5.0 kg/hr, and the extrusion temperature to about 200° C. to about 300° C. in order to secure the optical function layer of the present invention. have.
  • the polarizing plate of the present invention includes a polarizer and the optical film of an embodiment of the present invention laminated on at least one surface of the polarizer.
  • the optical film may be disposed on the light exit surface of the polarizer.
  • the optical functional layer By transmitting the polarized light emitted from the polarizer through the optical functional layer, it is possible to provide the effect of improving front luminance, contrast ratio, and visibility.
  • FIG. 5 is a cross-sectional view of a polarizing plate according to an embodiment of the present invention.
  • the absorption axis (MD of the polarizer) of the polarizer is substantially in the same direction as the MD of the optical function layer in the optical film.
  • substantially the same direction means not only when the MD of the polarizer and the MD of the optical functional layer are exactly the same, but also when the angle between the absorption axis of the polarizer and the MD of the optical functional layer is about 5° or less, for example, about 0° , 1°, 2°, 3°, 4° or 5°, preferably from about 0° to about 5°. In this case, the effect of improving visibility, contrast ratio, and luminance of the polarizing plate may be improved.
  • the polarizing plate includes a polarizer 20 and an optical film 10 formed on an upper surface of the polarizer 20 , that is, a light output surface of the polarizer.
  • the polarizer 20 converts incident natural light or polarized light into linearly polarized light in a specific direction, and may be manufactured from a polymer film having a polyvinyl alcohol-based resin as a main component.
  • the polarizer 10 may be manufactured by dyeing the polymer film with iodine or a dichroic dye, and stretching it in MD. Specifically, it may be prepared through a swelling process, a dyeing step, an stretching step, and a crosslinking step.
  • the polarizer 20 may have a total light transmittance of about 40% or more, for example, about 40% to about 47%, and a polarization degree of about 99% or more, for example, about 99% to about 100%. Within the above range, it can be used for a polarizing plate.
  • the polarizer 20 may have a thickness of about 2 ⁇ m to about 30 ⁇ m, specifically, about 4 ⁇ m to about 25 ⁇ m, and may be used in a polarizing plate within the above range.
  • the optical film 10 may be fixed to the polarizer 20 through a (meth)acrylic adhesive layer or an adhesive layer, but is not limited thereto.
  • a functional film or a functional coating layer is additionally formed on the upper surface of the optical film 10 to provide an additional function to the polarizing plate.
  • a coating layer or film providing an anti-reflection function, an anti-fingerprint function, a hard coating function, and the like may be formed.
  • a protective film and a protective layer may be additionally formed on at least one of the upper surface of the polarizer 20 , that is, the lower surface of the optical film 10 and the lower surface of the polarizer 20 .
  • the protective film is a polyester-based, cyclic polyolefin (COP) containing cellulose-based, polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate (PET), polybutylene naphthalate, etc. containing triacetyl cellulose (TAC).
  • COP cyclic polyolefin
  • the protective film may have a thickness of about 5 ⁇ m to about 70 ⁇ m, specifically, about 15 ⁇ m to about 45 ⁇ m, and may be used in the polarizing plate in the above range.
  • the protective film may have a retardation within a predetermined range.
  • the protective film may have an in-plane retardation Re of about 5,000 nm or more at a wavelength of 550 nm, specifically about 10,000 nm or more, more specifically about 10,000 nm or more, and more specifically about 10,100 nm to about 15,000 nm.
  • Re in-plane retardation Re of about 5,000 nm or more at a wavelength of 550 nm, specifically about 10,000 nm or more, more specifically about 10,000 nm or more, and more specifically about 10,100 nm to about 15,000 nm.
  • rainbow spots may not be recognized, and the diffusion effect of light diffused through the optical functional layer may be greater.
  • the optical display device of the present invention includes the polarizing plate of the present invention. Through this, the optical display device can provide the effect of improving the front luminance of light emitted from the liquid crystal panel or the light emitting device, the contrast ratio at the front and the side, and the visibility.
  • the optical display device may be a light emitting device display device including a liquid crystal display device, an organic light emitting device, and the like.
  • the optical display device may be a liquid crystal display device.
  • the liquid crystal display device includes a liquid crystal panel, a first polarizing plate disposed on a light incident surface of the liquid crystal panel, and a second polarizing plate disposed on a light exit surface of the liquid crystal panel, wherein the second polarizing plate is the present invention
  • It can be a polarizer of
  • the liquid crystal panel may be at least one of a vertical alignment (VA) mode, an in plane switching (IPS) mode, a twisted nematic (TN) mode, and a fringe field switch (FFS) mode.
  • VA vertical alignment
  • IPS in plane switching
  • TN twisted nematic
  • FFS fringe field switch
  • the liquid crystal panel may be in VA mode.
  • Polyethylene naphthalate was used as a material for a polymer
  • a mixture of polycarbonate and polyester was used as a material for a substrate
  • polyester was used as a material for the first and second protective layers.
  • the polymer material is put into the first extrusion unit
  • the base material material is put into the second extrusion unit
  • the first protective layer and the second protective layer material are produced 3 It was put into the extrusion unit.
  • the extrusion temperature of the material for the substrate and the material for the polymer was 295°C, and the I.V.
  • the polymer flow was corrected through adjustment, and the materials for the first and second protective layers were extruded at 280°C.
  • the polymer material was transferred to four first pressurizing means (Kawasaki company gear pumps) and the base material was transferred to four second pressurizing means (Kawasaki company gear pumps).
  • the discharge amount of the first pressurizing means is 4.2 kg/hr, 2.3 kg/hr, 2.8 kg/hr, and 3.6 kg/hr in order, respectively
  • the discharge amount of the second pressurizing means is 4.2 kg/hr, 2.3 kg/hr, respectively, in that order. , 2.8 kg/hr, and 3.6 kg/hr.
  • Four composite streams with different average optical thicknesses were prepared using four sea-island extrusion nozzles.
  • a first composite stream was prepared by putting the first polymer material transferred from the first pressing means and the first substrate material transferred from the second pressing means into the first island-in-the-sea extrusion nozzle.
  • up to the fourth complex was prepared.
  • the number of island component layers of the fourth slit distribution plate (T4) among the 1st to 4th island-type extrusion cages is 96, the diameter of the spit hole of the island component supply path is 0.17mm, and the total number of 4 island component supply paths is Each was 9300.
  • the diameter of the discharge port of the 6th nozzle distribution plate was 15 mm ⁇ 15 mm. The same nozzle was used for the sea-island extrusion nozzle.
  • the four composite streams discharged through the four sea-island extrusion nozzles were transferred through a separate flow path and then laminated in a collection block to form one core layer polymer.
  • the first protective layer and the second protective layer components flow through the flow path from the third extruded part, and the first protective layer and the second protective layer are respectively formed on the upper and lower surfaces of the polymer material. was formed.
  • the polymer in which the protective layer is formed such that the aspect ratio of the first complex stream is 1/13500, the aspect ratio of the second complex stream is 1/25000, the aspect ratio of the third complex stream is 1/19500, and the aspect ratio of the fourth complex stream is 1/15900 was induced to spread in the coat hanger die to correct the flow rate and pressure gradient.
  • the width of the die inlet is 200 mm
  • the thickness is 20 mm
  • the width of the die outlet is 960 mm
  • the thickness is 2.4 mm
  • the flow rate is 1 m/min.
  • the polymer was rod-shaped, and the refractive index of the polymer was nx:1.88, ny:1.64, nz:1.64, the total refractive index was 1.88, and the refractive index of the substrate was 1.64 at a wavelength of 550 nm.
  • a polyvinyl alcohol film (PS#60, Kuraray, Japan, thickness before stretching: 60 ⁇ m) was stretched 6 times in an aqueous iodine solution at 55° C. to prepare a polarizer (thickness: 22 ⁇ m).
  • a cyclic polyolefin (COP)-based film (ZEON, ZB12-065250) was attached to the lower surface of the prepared polarizer, and a polyethylene terephthalate (PET) film (DNP, ASDS20S-PET) was applied to the upper surface of the prepared polarizer. adhered. Then, the prepared optical film was adhered to the upper surface of the PET film with an adhesive to prepare a polarizing plate. At this time, the absorption axis (MD) of the polarizer of the polarizing plate and the MD of the optical function layer are parallel.
  • COP cyclic polyolefin
  • PET polyethylene terephthalate
  • Example 1 a polarizing plate was manufactured in the same manner as in Example 1, except that the discharge amount was adjusted during the manufacture of the optical film.
  • Example 1 a polarizing plate was manufactured in the same manner as in Example 1, except that the extrusion temperature and the discharge amount were adjusted during the manufacture of the optical film.
  • Example 1 a polarizing plate was manufactured in the same manner as in Example 1, except that the discharge amount was adjusted during the manufacture of the optical film.
  • Example 1 a polarizing plate in which a PET film, a polarizer, and a COP film were sequentially laminated was prepared in the same manner as in Example 1 except that the optical film was not adhered to the upper surface of the PET film.
  • a polarizer was prepared by stretching the polyvinyl alcohol film 3 times at 60° C., adsorbing iodine, and then stretching it 2.5 times in an aqueous boric acid solution at 40° C.
  • a polarizing plate was manufactured by adhering a triacetyl cellulose film (thickness 80 ⁇ m) as a base layer to both sides of the polarizer with an adhesive for a polarizing plate (Z-200, Nippon Goshei). The prepared polarizing plate was used as a light source-side polarizing plate.
  • a module for a liquid crystal display was manufactured by sequentially assembling the light source-side polarizing plate, the liquid crystal panel (VA mode, Samsung Electronics 55 inch, 4K Normal BLU VA panel), and the polarizing plate prepared in Examples and Comparative Examples.
  • the optical film was assembled so that it came out to the outermost part.
  • Luminance ratio (unit: %): Using EZCONTRAST X88RC (EZXL-176R-F422A4, ELDIM Co., Ltd.), which is a luminance measuring device, for the manufactured liquid crystal display module, the viewing angle of the spherical coordinate system from 0° to 90° The luminance values were measured in each of the white mode and the black mode in the range. The luminance ratio was calculated as [(luminance value at the side (0°, 30°) or side (0°, 60°)/luminance value at the front (0°, 0°)) x 100].
  • Viewing angle (unit: °): When the luminance was measured in the range from 0° to 90° in the viewing angle in (2), a viewing angle that was 3/4 or 1/2 of the frontal luminance was obtained. When the 3/4 viewing angle was less than 45°, it was evaluated as ⁇ , and when the viewing angle was 45° or more, it was evaluated as ⁇ . When the 1/2 viewing angle was less than 73°, it was evaluated as ⁇ , and when it was 73° or more, it was evaluated as ⁇ .
  • the thickness is the thickness of the optical function layer.
  • the optical film of the present invention can widen the viewing angle compared to Comparative Example 2, and can also increase the contrast ratio from the side.
  • the optical pattern compared to the conventional optical film for improving visibility since it does not have an optical pattern compared to the conventional optical film for improving visibility, there is no end processing problem due to the optical pattern when laminating a polarizer and a roll-to-roll, so that yield and fairness can be improved.
  • Comparative Example 1 did not satisfy the overall configuration of the optical film of the present invention, and thus the effect of improving the lateral contrast ratio was significantly lower than that of Example.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Polarising Elements (AREA)
  • Electroluminescent Light Sources (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)
  • Liquid Crystal (AREA)

Abstract

L'invention concerne un film optique, une lame polarisante le comprenant et un dispositif d'affichage optique les comprenant, le film optique comprenant une couche fonctionnelle optique, la couche fonctionnelle optique comprenant un substrat et une pluralité de polymères dispersés à l'intérieur du substrat, la pluralité de polymères étant disposés dans un nombre total de 50 à 220 couches dans la direction de l'épaisseur du substrat, la longueur moyenne des axes principaux de la pluralité de polymères étant de 2,5 mm à 5 mm, la longueur moyenne des axes secondaires de la pluralité de polymères étant de 150 nm à 400 nm et l'épaisseur de la couche fonctionnelle optique étant de 5 µm à 60 µm.
PCT/KR2021/008351 2020-07-10 2021-07-01 Film optique, lame polarisante le comprenant et dispositif d'affichage optique les comprenant WO2022010179A1 (fr)

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KR10-2020-0085552 2020-07-10

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KR20120031500A (ko) * 2009-07-22 2012-04-03 코니카 미놀타 옵토 인코포레이티드 광학 이방성 필름, 편광판 및 액정 표시 장치
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KR101906253B1 (ko) * 2012-12-06 2018-12-07 도레이케미칼 주식회사 폴리머가 분산된 반사 편광자 및 그 제조방법
KR101940327B1 (ko) * 2012-12-06 2019-01-18 도레이케미칼 주식회사 폴리머가 분산된 반사 편광자 및 그 제조방법

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KR20120031500A (ko) * 2009-07-22 2012-04-03 코니카 미놀타 옵토 인코포레이티드 광학 이방성 필름, 편광판 및 액정 표시 장치
KR20120092032A (ko) * 2011-02-09 2012-08-20 웅진케미칼 주식회사 중합체가 분산된 반사 편광자
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