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WO2016052813A1 - Film optique et son procédé de fabrication - Google Patents

Film optique et son procédé de fabrication Download PDF

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Publication number
WO2016052813A1
WO2016052813A1 PCT/KR2014/012325 KR2014012325W WO2016052813A1 WO 2016052813 A1 WO2016052813 A1 WO 2016052813A1 KR 2014012325 W KR2014012325 W KR 2014012325W WO 2016052813 A1 WO2016052813 A1 WO 2016052813A1
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WO
WIPO (PCT)
Prior art keywords
film
polyvinyl alcohol
barrier layer
optical film
adhesive
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/KR2014/012325
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English (en)
Korean (ko)
Inventor
김용운
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Samsung SDI Co Ltd
Original Assignee
Samsung SDI Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Samsung SDI Co Ltd filed Critical Samsung SDI Co Ltd
Publication of WO2016052813A1 publication Critical patent/WO2016052813A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
    • B32B27/306—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising vinyl acetate or vinyl alcohol (co)polymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/02—Physical, chemical or physicochemical properties
    • B32B7/023—Optical properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L29/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an alcohol, ether, aldehydo, ketonic, acetal or ketal radical; Compositions of hydrolysed polymers of esters of unsaturated alcohols with saturated carboxylic acids; Compositions of derivatives of such polymers
    • C08L29/02—Homopolymers or copolymers of unsaturated alcohols
    • C08L29/04—Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
    • G02B1/14—Protective coatings, e.g. hard coatings
    • 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
    • G02B5/3083—Birefringent or phase retarding elements
    • 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
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/80—Constructional details
    • H10K59/8793—Arrangements for polarized light emission
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/12—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by using adhesives
    • B32B2037/1253—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by using adhesives curable adhesive
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/12—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by using adhesives
    • B32B2037/1276—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by using adhesives water-based adhesive
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/40—Properties of the layers or laminate having particular optical properties
    • B32B2307/42—Polarizing, birefringent, filtering
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2309/00—Parameters for the laminating or treatment process; Apparatus details
    • B32B2309/08—Dimensions, e.g. volume
    • B32B2309/10—Dimensions, e.g. volume linear, e.g. length, distance, width
    • B32B2309/105—Thickness
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2329/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an alcohol, ether, aldehydo, ketonic, acetal, or ketal radical; Hydrolysed polymers of esters of unsaturated alcohols with saturated carboxylic acids; Derivatives of such polymer
    • C08J2329/02—Homopolymers or copolymers of unsaturated alcohols
    • C08J2329/04—Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids

Definitions

  • the present invention relates to an optical film and a method for producing the optical film.
  • grayscale is obtained for each pixel by optically modulating the transmitted light according to an input video signal or by self-emitting luminance pixels according to the video signal.
  • the layer which modulates such transmitted light and light emission luminance for each pixel is called a modulation function layer.
  • a liquid crystal layer corresponds to a modulation function layer
  • an organic EL light emitting layer corresponds to a modulation function layer.
  • liquid crystal layer is not a light valve that completely blocks light by itself
  • polarizing plates may be disposed on both sides of the liquid crystal layer in the up and down direction of the liquid crystal layer, that is, the backlight side and the viewer's viewing side. have.
  • the organic light emitting element does not arrange the polarizing plate for the purpose of shielding light emission.
  • external light may be reflected by the metal wires inside, which causes a decrease in contrast, and thus, a polarizing plate is disposed to prevent this.
  • the display devices become thinner, internal parts are also required to be thinner.
  • a film or the like constituting such a display device is required to be thinned. Therefore, the polarizing plate used for a display apparatus is also required to be thin, and the polarizing film which comprises a polarizing plate also came to require thinning more than a conventional product.
  • an optical film including a polarizing film that is thin and excellent in optical characteristics and excellent in durability, and a method of manufacturing the same.
  • the technical problem to be solved by the present invention is to provide an optical film including a thin film polarizing film excellent in durability while being a thin film.
  • Another object of the present invention is to provide a display device including the optical film.
  • the present invention is applicable to a flexible display device and provides an optical film having excellent antireflection function and durability.
  • the optical film according to an embodiment of the present invention for achieving the above object is a polyvinyl alcohol-based film in which iodine or dichroic dye is dye-oriented, and formed on at least one side of the polyvinyl alcohol-based film, polyvinyl alcohol It may include a barrier layer containing a system resin.
  • the barrier layer may include an adhesive layer formed on one surface of the barrier layer and formed on the other surface of the surface on which the polyvinyl alcohol-based film is formed.
  • barrier layer may further include polyvinylacetate or polyethylene.
  • the polyvinyl alcohol-based film may be formed on one surface
  • the barrier layer may include a protective film adhered to the other surface of the surface formed.
  • the thickness of the polyvinyl alcohol-based film may range from 0.5 ⁇ m to 15 ⁇ m.
  • a display device may include a display panel and a polarizer disposed on at least one surface of the display panel, and the polarizer may include the optical film. That is, the polarizing plate may be formed on at least one surface of the polyvinyl alcohol-based film in which iodine or dichroic dye is dye-oriented and the polyvinyl alcohol-based film, and may include a barrier layer including a polyvinyl alcohol resin.
  • the polarizing plate may further include an adhesive layer disposed between the barrier layer and the display panel.
  • the display device may further include a retardation film disposed between the polarizing plate and the display panel and an adhesive layer disposed between the retardation film and the display panel.
  • the display panel may include an organic light emitting diode (OLED) panel including an organic light emitting diode.
  • OLED organic light emitting diode
  • the polarizing plate may be disposed on the viewing side of the OLED panel.
  • the optical film manufacturing method for achieving the above object is to prepare a polyvinyl alcohol-based film in which the iodine or dichroic dye dye-oriented, comprising a polyvinyl alcohol-based resin on the base substrate It may include the step of laminating the laminated film on which the barrier layer is formed on the polyvinyl alcohol-based film, and separating the base substrate.
  • the laminating may be performed through an adhesive between the polyvinyl alcohol-based film and the barrier layer.
  • the adhesive may include an aqueous adhesive or an ultraviolet curable adhesive.
  • the method may further include forming a protective film formed on one surface of the polyvinyl alcohol-based film and interposing an adhesive on the other surface of the surface on which the barrier layer is formed.
  • barrier layer may further include polyvinylacetate or polyethylene.
  • the optical film of the present invention may include a polarizing film having excellent optical properties while simplifying the manufacturing process.
  • the manufacturing method of the optical film of this invention can manufacture the optical film containing the polarizing film which is easy in a process, and has the outstanding optical characteristic.
  • the present invention is applicable to a flexible display device and provides an optical film having excellent antireflection function and durability.
  • FIG. 1 is a cross-sectional view of an optical film according to an embodiment of the present invention.
  • FIG. 2 is a cross-sectional view of an optical film according to another embodiment of the present invention.
  • FIG. 3 is a cross-sectional view of an optical film according to another embodiment of the present invention.
  • FIG. 4 is a schematic cross-sectional view of a display device according to an exemplary embodiment.
  • FIG. 5 is a schematic cross-sectional view of a display device according to another exemplary embodiment.
  • FIG. 6 is a schematic cross-sectional view of a display device according to another exemplary embodiment of the present invention.
  • FIG. 7 to 9 are cross-sectional views schematically showing a manufacturing process of an optical film according to an embodiment of the present invention.
  • FIG. 11 is a graph illustrating orthogonal transmittance values according to wavelengths of Examples 1 to 4 and Comparative Examples.
  • references to elements or layers "on" other elements or layers include all instances where another layer or other element is directly over or in the middle of another element. Like reference numerals refer to like elements throughout.
  • first, second, etc. are used to describe various components, these components are of course not limited by these terms. These terms are only used to distinguish one component from another. Therefore, of course, the first component mentioned below may be a second component within the technical spirit of the present invention.
  • an optical film according to an embodiment of the present invention may be formed on at least one surface of the polyvinyl alcohol-based film 100 and the polyvinyl alcohol-based film 100 in which iodine or dichroic dye is dye-oriented.
  • the barrier layer 200 may be formed and include a polyvinyl alcohol-based resin.
  • the polyvinyl alcohol-based film 100 is a dye-oriented orientation of iodine or dichroic dye, more specifically, the molecular chain in the polyvinyl alcohol-based film 100 is oriented in a predetermined direction, oriented molecular chain
  • the iodine or dichroic dye may be dyed. Therefore, the polyvinyl alcohol-based film 100 in which the iodine or dichroic dye of the present invention is dye-oriented may be used as a polarizing film to make natural light or any polarized light in a specific direction. Therefore, the optical film of the present invention can be used as a polarizing plate.
  • the polyvinyl alcohol-based film 100 may be stretched in the uniaxial direction to align the molecular chain, it may be stretched 2 to 8 times as a non-limiting example.
  • a barrier layer 200 including a polyvinyl alcohol resin may be formed on one surface of the polyvinyl alcohol-based film 100, and one of the polyvinyl alcohol-based films 100 may be formed.
  • the barrier layer 200 including polyvinyl alcohol-based resin By forming the barrier layer 200 including polyvinyl alcohol-based resin on the surface, it is possible to prevent the iodine or dichroic dye dye-oriented in the polyvinyl alcohol-based film 100 from escaping to the outside.
  • cracks of the polyvinyl alcohol-based film 100 may be prevented, and as a whole, cracks of the optical film may be prevented, thereby improving durability.
  • the barrier layer 200 may include a polyvinyl alcohol-based resin, and the barrier layer 200 may further include polyvinyl acetate or polyethylene, but is not limited thereto.
  • the polyvinyl alcohol-based resin as described above, it is possible to prevent the dichroic dye or iodine from escaping to the outside in the polyvinyl alcohol-based film 100 iodine or dichroic dye dye-oriented, polyvinyl alcohol-based Cracks may be prevented from occurring in the film 100 and thereby durability may be improved.
  • the polyvinyl alcohol-based resin may be included in an amount of 80% by weight to 100% by weight in the barrier layer 200, for example, may be included in an amount of 90% by weight to 100% by weight.
  • the barrier layer 200 may not adhere onto the polyvinyl alcohol-based film 100 in which the iodine or the dichroic dye is dye-oriented.
  • the barrier layer 200 may be composed of only a polyvinyl alcohol-based resin, while the barrier layer 200, unlike the polyvinyl alcohol-based film 100, iodine or dichroic dyes are dyed It is not oriented and can be a transparent layer.
  • the barrier layer 200 may be stretched by 1.1 to 3 times, but is not limited thereto.
  • FIG. 2 is a cross-sectional view of an optical film according to another embodiment.
  • the barrier film 200 is formed on one surface of the barrier layer 200 and is formed on the other surface of the surface on which the polyvinyl alcohol-based film 100 is formed. It may include a first adhesive layer 300 to be. That is, the first adhesive layer 300, the barrier layer 200 and the polyvinyl alcohol-based film 100 may be a structure that is sequentially stacked.
  • the first adhesive layer 300 may be used for attaching or adhering the optical film to the display panel when the optical film is disposed in a display device to be described later.
  • the present invention is not limited thereto, and when the retardation film is disposed between the polarizing plate including the optical film and the display panel in the display device, the retardation film and the polarizing plate may be used.
  • a release paper (not shown) may be attached to the first adhesive layer 300 for easy transportation and storage of the optical film during the manufacturing process of the display panel, and the optical film is displayed later. When bonded to the panel, the release paper can be removed and used.
  • the optical film may further include a protective film 500 formed on one surface of the polyvinyl alcohol-based film 100 and adhered to the other surface of the surface on which the barrier layer 200 is formed.
  • the barrier layer 200 including the polyvinyl alcohol resin may be formed on one surface of the polyvinyl alcohol-based film 100, and the protective film 500 may be adhered to the other surface.
  • the protective film 500 may be adhered by the adhesive 400 in a state where the adhesive 400 is interposed between the protective film 500 and the polyvinyl alcohol-based film 100.
  • the adhesive 400 may use an adhesive or the like well known in the art, the adhesive may be appropriately selected by those skilled in the art in consideration of the material of the protective film 500 used.
  • various films used as polarizer protective films or retardation films in the art may be used without limitation.
  • triacetyl cellulose cellulose-based such as diacetyl cellulose, polyethylene terephthalate, Polyesters such as polyethylene naphtharate, polybutylene terephthalate, cyclic polyolefins, polycarbonates, polyethers, polysulfones, polyamides, polyimides, polyolefins, polyarylates, polys
  • the film may be made of a material selected from the group consisting of vinyl alcohol, polyvinyl chloride, polyvinylidene chloride, acrylic, or a mixture thereof.
  • the optical film according to the present invention forms the protective film 500 on only one surface of both sides of the polyvinyl alcohol-based film 100 iodine or dichroic dye dye-oriented, thereby forming an optical film including a thin polarizing film Can provide. Therefore, the overall thickness of the display device to which the optical film is applied can be reduced.
  • the barrier layer 200 on the other surface of the surface on which the protective film 500 is formed, it is possible to provide an optical film that is thin and prevents cracks.
  • the thickness of the polyvinyl alcohol-based film 100 may be in the range of 0.5 ⁇ m 15 ⁇ m.
  • the process may be thinned, and when the thickness is 15 ⁇ m or less, it may be applied to a thin film device or the like.
  • FIG. 4 is a cross-sectional view schematically illustrating a display device according to an exemplary embodiment of the present invention.
  • the display device may include a display panel 800 and a polarizer disposed on at least one surface of the display panel 800, and the polarizer may include the optical film of the present invention. That is, the polarizing plate is formed on at least one surface of the polyvinyl alcohol-based film 100 and the polyvinyl alcohol-based film 100 in which the iodine or the dichroic dye is dye-oriented, and a barrier including a polyvinyl alcohol-based resin ( 200) layer.
  • the polarizer may further include a first adhesive layer 300 disposed between the barrier layer 200 and the display panel 800.
  • the polyvinyl alcohol film 100 in which the iodine or the dichroic dye is dyed and oriented onto the display panel 800 may be attached to the display panel 800 by the first adhesive layer 300.
  • the adhesive 400 is interposed between the protective film 500 and the polyvinyl alcohol-based film 100.
  • the protective film 500 may be attached. That is, the first protective film 500 described in the optical film is attached to only one surface of the polyvinyl alcohol-based film 100, the optical film having the barrier layer 200 formed on the other surface is in contact with the barrier layer 200.
  • the adhesive layer 300 may be attached to the display panel 800.
  • the display panel 800 may include an organic light emitting diode (OLED) panel including an organic light emitting diode.
  • OLED organic light emitting diode
  • the OLED panel may include respective pixels, and each of the pixels may include an OLED composed of an organic light emitting layer between an anode and a cathode and a pixel circuit driving the OLED independently.
  • the pixel circuit may mainly include a switching thin film transistor (TFT), a capacitor, and a driving TFT.
  • the switching thin film transistor charges the data voltage to the capacitor in response to the scan pulse, and the driving TFT controls the amount of current supplied to the OLED according to the data voltage charged to the capacitor, thereby adjusting the amount of light emitted from the OLED and displaying an image. I can display it.
  • the OLED panel is well known in the art, more detailed description thereof will be omitted.
  • the polarizing plate may be disposed on the viewing side of the OLED panel. That is, the polarizer may be attached to the side of the viewer to observe the image displayed from the OLED panel. Therefore, the fall of contrast by reflection of external light can be prevented.
  • the display panel 800 may be formed of a flexible material.
  • the display panel is formed of a flexible material
  • the force (repulsive force) to bend and recur according to the display panel may increase. Therefore, a thin polarizing plate is required, and in the case of the optical film of the present invention, since the protective film 500 is formed only on one surface of the polyvinyl alcohol-based film 100 containing iodine or dichroic dye, a flexible material
  • a thin polarizing plate applicable to a display panel of the present invention can be provided, and since the barrier layer 200 is formed on the other surface of the polyvinyl alcohol-based film 100, it is possible to improve the durability while preventing the occurrence of cracks. .
  • FIG. 5 is a schematic cross-sectional view of a display device according to another exemplary embodiment of the present invention.
  • a display device includes a phase difference film 600 disposed between a polarizer and a display panel 800 and the phase difference.
  • the display device may further include a second adhesive layer 700 disposed between the film 600 and the display panel 800. That is, the display panel 800 has a structure in which the second adhesive layer 700, the retardation film 600, the first adhesive layer 300, the barrier layer 200, and the polyvinyl alcohol film 100 are sequentially stacked.
  • the protective film 500 may be attached to the other surface of the polyvinyl alcohol-based film 100 with the adhesive 400 interposed therebetween.
  • the retardation film 600 serves to improve the viewing angle, contrast ratio, color characteristics, etc. by compensating the retardation of light by a desired value, and has a retardation film having a retardation value required by one of ordinary skill in the art. Can be applied and can be omitted if necessary.
  • a film having reverse wavelength dispersion characteristics may be used as the retardation film 600 to improve antireflection characteristics.
  • the retardation film 600 is well known in the art, more detailed description thereof will be omitted.
  • FIG. 6 is a schematic cross-sectional view of a display device according to another exemplary embodiment.
  • the display panel 900 constituting the display device may be a liquid crystal cell.
  • the display device may further include a backlight unit (not shown).
  • a backlight unit not shown.
  • a separate backlight unit is required.
  • the liquid crystal cell 900 may typically include two substrates and a liquid crystal layer interposed between the substrates, one of which is generally a color filter, an opposite electrode, an alignment layer, and the other substrate.
  • a liquid crystal drive electrode, a wiring pattern, a thin film transistor element, an alignment film, and the like may be formed in the substrate.
  • Examples of the operation mode of the liquid crystal cell 900 include a twisted nematic mode or an electrically controlled birefrigence mode.
  • Examples of the electrically controlled birefrigence mode include a vertical alignment method, an OCB (Optically Compensated) method, an IPS (In-Plane Switching) method, and the like.
  • the backlight unit may generally include a light source, a light guide plate, a reflective film, and the like. According to the configuration of the backlight can be arbitrarily divided into a direct method, a side light method, a planar light source method.
  • the polarizing plate including the optical film of the present invention may be formed on both sides of the liquid crystal cell 900. That is, the optical film may be interposed between the backlight unit (not shown) and the liquid crystal cell 900. In this case, the polyvinyl alcohol-based film 100 of the optical film may transmit only light that vibrates in a specific direction among the light incident from the light source of the backlight unit.
  • the optical film may be included at a position opposite to a backlight unit (not shown) of the liquid crystal cell 900.
  • the display panel 900 may be positioned on the surface of the display panel 900, but the present invention is not limited thereto and may be interposed between other components of the display device. That is, when the liquid crystal cell 900 is disposed therebetween, the upper polyvinyl alcohol-based film 100 and the lower polyvinyl alcohol-based film 100 are both the liquid crystal cell 900 and the polyvinyl alcohol-based film ( The barrier layer 200 and the first adhesive layer 300 may be disposed between 100, and the first adhesive layer 300 may be in direct contact with the liquid crystal cell 300.
  • the transmission axes of the polyvinyl alcohol-based films constituting each polarizing plate may be perpendicular or parallel.
  • phase difference film and a second adhesive layer may be further included between the display panel including the liquid crystal cell and the upper and / or lower polyvinyl alcohol-based films. Meanwhile, since the retardation film and the second adhesive layer have already been described in the optical film, overlapping descriptions will be omitted.
  • FIGS. 7 to 9 are cross-sectional views schematically showing the manufacturing process of the optical film according to an embodiment of the present invention.
  • a manufacturing method of an optical film according to an embodiment of the present invention will be described with reference to FIGS. 7 to 9.
  • Method for manufacturing an optical film preparing a polyvinyl alcohol-based film 100 iodine or dichroic dye dye-oriented, a polyvinyl alcohol-based resin on a base substrate (1000) And laminating the laminated film including the barrier layer 200 including the polyvinyl alcohol-based film 100 to each other, and separating the base substrate 1000.
  • the barrier layer 200 may further include polyvinyl acetate or polyethylene in addition to the polyvinyl alcohol-based resin, and may further include a copolymerized form. Since the description has already been made in the optical film, redundant descriptions will be omitted.
  • the base substrate 1000 may be polycarbonate, polyacrylate, polyethylene terephthalate, polyethylene, triacetyl cellulose, polystyrene, polyimide, polypropylene, cycloolefin, polyurethane
  • the resin may include, but is not limited to, the above-described technology in consideration of the type of polyvinyl alcohol-based resin constituting the barrier layer 200 and the attraction force coupling between the base substrate 1000 and the barrier layer 200. Those skilled in the art can select as appropriate.
  • the method for manufacturing the optical film of the present invention may prepare a polyvinyl alcohol-based film 100 in which iodine or dichroic dye is dye-oriented.
  • the polyvinyl alcohol-based film 100 in which the iodine or the dichroic dye is dye-oriented may be a polarizing film (or polarizer).
  • the step of preparing the polyvinyl alcohol-based film 100 may be prepared by a general polarizer manufacturing method.
  • iodine or dichroic dye may be dyed and crosslinked on the polyvinyl alcohol-based film 100 through dyeing, crosslinking, and stretching of the polyvinyl alcohol-based film, and it may be oriented in a specific direction by stretching.
  • the step of preparing the polyvinyl alcohol-based film 100 in which the iodine or the dichroic dye is oriented dyeing first, the polyvinyl alcohol-based film itself through the dyeing, crosslinking, stretching step, or the base film It can be prepared by bonding to and through dyeing, crosslinking, stretching and the like.
  • the polyvinyl alcohol-based film may be subjected to a step of dyeing iodine or dichroic material.
  • the dyeing step is a step of introducing iodine or a dye, a pigment, or a mixture thereof, into a polyvinyl alcohol-based film to adsorb them into the film.
  • the iodine, dye, or pigment molecules absorb light oscillating in the stretching direction of the polarizing film and transmit light oscillating in the vertical direction, thereby obtaining polarized light having a specific vibration direction.
  • the dyeing step may be performed by impregnating a polyvinyl alcohol-based film or a laminated film in which a polyvinyl alcohol-based film is laminated on a substrate to a solution of iodine or a dichroic material.
  • a solution of iodine or a dichroic material for example, the case of dyeing using the iodine, the temperature of the iodine solution is in the range of 20 °C to 50 °C, the impregnation time may be in the range of 10 to 300 seconds.
  • an aqueous solution containing iodine (I 2 ) and iodine ions, for example, potassium iodide (KI) used as a dissolution aid may be used.
  • the concentration of iodine (I 2 ) may range from 0.01 to 0.5% by weight based on the total weight of the aqueous solution
  • the concentration of potassium iodide (KI) may range from 0.01 to 10% by weight based on the total weight of the aqueous solution. have.
  • the swelling step may further be included prior to carrying out the dyeing step.
  • the swelling step may serve to soften the molecular chain of the polyvinyl alcohol-based film and relax the molecular chain, so that the dichroic material is homogeneously dyed into the inside of the polyvinyl alcohol-based film during the dyeing process, thereby preventing stains. have.
  • a polyvinyl alcohol-based film may be stretched.
  • it may be carried out by a wet method in a swelling bath containing swelling liquid.
  • the swelling temperature may vary depending on the film thickness, for example, may be in the range of 15 °C to 40 °C.
  • a crosslinking process may be further included after the dyeing step.
  • the dichroic molecules are adsorbed onto the polymer matrix of the polyvinyl alcohol-based film using boric acid, borate, or the like.
  • the crosslinking method include a deposition method in which a polyvinyl alcohol-based film is deposited by dipping a boric acid solution or the like, but is not limited thereto, and may be performed by a coating method or a spraying method for applying or spraying a solution to a film. It may be.
  • the stretching step may use a wet stretching method and / or dry stretching method common to the art polyvinyl alcohol-based film.
  • Non-limiting examples of the dry stretching method include an inter-roll stretching method, a heating roll stretching method, a compression stretching method, a tenter stretching method, and the like.
  • Non-limiting examples include a tenter stretching method, an inter-roll stretching method, and the like.
  • the drawing may be performed in alcohol, water or boric acid aqueous solution.
  • a solvent such as methyl alcohol or propyl alcohol may be used, but is not limited thereto.
  • Stretching temperature and time can be suitably selected and used according to the material of a film, desired elongation rate, a usage method, etc.
  • the stretching may be uniaxial stretching or biaxial stretching.
  • biaxial stretching may be performed to implement retardation characteristics.
  • the dyeing and drawing steps need not always be in the same order, and may be appropriately selected according to the process equipment and equipment, and in some cases, the drawing step is performed by the dyeing or crosslinking. It can be done simultaneously with the process. If the stretching step proceeds simultaneously with the dyeing step, the stretching step may be performed in an iodine solution. On the other hand, when the stretching step is performed simultaneously with the crosslinking process, the stretching step may be performed in an aqueous boric acid solution.
  • the base film may be removed to obtain a polyvinyl alcohol-based film 100 in which the iodine or dichroic dye is dye-oriented.
  • Preparing the polyvinyl alcohol-based film 100 iodine or dichroic dye dye-oriented described above is illustrative, all the various methods used as a method for producing a polarizing film in the art is applicable, It is not limited to either.
  • the laminated film on which the barrier layer 200 including the polyvinyl alcohol-based resin is formed on the base substrate 1000 may be laminated on the polyvinyl alcohol-based film 100.
  • the laminating may include laminating the barrier layer 200 in a direction opposite to one surface of the polyvinyl alcohol-based film 100.
  • the barrier layer 200 formed on the base substrate 1000 may be laminated between the base substrate 1000 and the polyvinyl alcohol film 100.
  • the polyvinyl alcohol-based film 100, the barrier layer 200, and the base substrate 1000 may be laminated in order.
  • the laminating may be performed through an adhesive (not shown) between the polyvinyl alcohol-based film 100 and the barrier layer 200.
  • the adhesive may include, but is not limited to, an aqueous adhesive or an ultraviolet curable adhesive.
  • the water-based adhesive may include at least one selected from the group consisting of polyvinyl alcohol resins, acrylic resins and vinyl acetate-based, urethane-based resins, or may include polyvinyl alcohol-based resins having an acrylic group and a hydroxyl group. .
  • As the water-based adhesive agent for example, JCP, JC-25, JC-33 or polyvinyl alcohol adhesives such as NH-26, NH-14, and Z-320, manufactured by Japan Synthetic, may be used.
  • the present invention is not limited thereto.
  • the ultraviolet curable adhesive may include an acrylic compound, for example, may be acrylic, urethane-acrylic, epoxy-based.
  • the present invention is not limited thereto.
  • the method may include separating the base substrate 1000.
  • the base substrate 1000 may be separated by applying a force greater than or equal to a predetermined peel force, and when the base substrate 1000 is separated, an optical film as shown in FIG. 1 may be manufactured. Therefore, the optical film of the form in which the barrier layer 200 is formed on one surface of the polyvinyl alcohol-based film 100 can be manufactured.
  • the manufacturing method of the optical film of the present invention is formed on one side of the polyvinyl alcohol-based film, further comprising the step of forming a protective film through the adhesive on the other side of the surface on which the barrier layer is formed can do. That is, by forming a protective film only on one surface of the polyvinyl alcohol-based film, it is possible to manufacture an optical film comprising a thin polarizing film.
  • polarizer protective film various films used in the art as a polarizer protective film or a retardation film may be used without limitation, for example, cellulose-based such as triacetyl cellulose, diacetyl cellulose, polyethylene terephthalate, polyethylene naphthalate Polyesters such as polybutylene terephthalate, cyclic polyolefins, polycarbonates, polyethers, polysulfones, polyamides, polyimides, polyolefins, polyarylates, polyvinyl alcohols , Polyvinyl chloride-based, polyvinylidene chloride-based, acrylic or may be a film of a material selected from the group consisting of a mixture thereof.
  • cellulose-based such as triacetyl cellulose, diacetyl cellulose, polyethylene terephthalate, polyethylene naphthalate
  • Polyesters such as polybutylene terephthalate, cyclic polyolefins, polycarbonates, polyethers,
  • the method for forming the protective film is not particularly limited, and may be performed through an adhesive or an adhesive well known in the art, and the adhesive or adhesive may be appropriately selected in consideration of the material of the protective film used. Can be.
  • a polyvinyl alcohol (PVA) film (PE30, Kuraray, Japan, 30 ⁇ m thick) was drawn twice at 50 ° C., iodine was adsorbed, and 2.5 times drawn at 40 ° C. in boric acid solution to give a polarizer with a thickness of 11 ⁇ m. Prepared.
  • PVA polyvinyl alcohol
  • HC TAC hard coating TAC (triacetyl cellulose), thickness: 30 ⁇ m
  • PET polyethylene terephthalate
  • A04, SKC polyethylene terephthalate
  • PVA 5 ⁇ m on the lower part Co., Ltd., 43 ⁇ m was dried using a PVA powder dissolved in water and then passed through a drying zone to obtain a film. Thereafter, after removing the polyethylene terephthalate film, an acrylic pressure-sensitive adhesive was coated on the release film, and the dried film was laminated on the surface on which the PVA of the polarizer was formed to prepare a polarizing plate.
  • the retardation film (product name: RM148, Teijin) formed from the polycarbonate (PC) film was bonded to the polarizing plate manufactured as mentioned above using an acryl-type adhesive agent, and the retardation film was provided, and the polarizing plate of 115 micrometers in thickness was obtained.
  • a polarizing plate was manufactured in the same manner as in Example 1, except that a polyethylene terephthalate film coated with 7 ⁇ m of polyvinyl alcohol-based resin was applied to obtain a polarizing plate having a thickness of 117 ⁇ m.
  • a polarizing plate was manufactured in the same manner as in Example 1 except that a polyethylene terephthalate film coated with 3 ⁇ m of polyvinyl alcohol-based resin was prepared to obtain a polarizing plate having a thickness of 113 ⁇ m.
  • a polarizing plate was manufactured in the same manner as in Example 1 except that a polyethylene terephthalate film coated with 1 ⁇ m of polyvinyl alcohol-based resin was applied to obtain a polarizing plate having a thickness of 111 ⁇ m.
  • a polarizing plate was manufactured in the same manner as in Example 1 except that no polyvinyl alcohol-based resin was formed under the polarizer to obtain a polarizing plate having a thickness of 115 ⁇ m.
  • the single transmittance according to the wavelength of the polarizing plates prepared in Examples 1-4 and Comparative Examples was measured.
  • the single transmittance was measured using a V-7100 (model name) of JVP Co., Ltd., attached to the holder, and then fitted to the stage.
  • Examples 1 to 4 in which the barrier layer according to the present invention was formed, showed nearly similar single transmittance values. Thereby, even when the barrier layer of this invention is formed, it turns out that an optical characteristic does not fall.
  • Orthogonal transmittance according to the wavelength of the polarizing plate prepared in Examples 1-4 and Comparative Examples was measured. Orthogonal transmittance was measured after attaching to a holder using JVP V-7100 (model name) and fitting it to the stage.
  • Examples 1 to 4 having the barrier layer according to the present invention showed almost similar orthogonal transmittance values. Thereby, even when the barrier layer of this invention is formed, it turns out that an optical characteristic does not fall.
  • the color a value and the color b value mean the coordinates of the color in the Hue color coordinate.
  • the color a value means green color as +, and red color as-, and the color b value is yellow as +, and blue color as-. It means losing.
  • the values of the color a and b values are within a numerical range of ⁇ 5, they can be used as polarizers.
  • the polarizing plate according to the embodiment of the present invention has a numerical value range of ⁇ 5, close to 0, and has excellent color a, b values.
  • the color ac value represents the Hue color when crossed, and the meaning is the same as the color a value.
  • the color bc value represents the color in the Hue color coordinate at the time of cross, and the meaning is the same as the color b value.
  • the polarizing plate according to the embodiment of the present invention has a color ac value and a color bc value close to 0, as shown in Table 1 below.
  • the color xc value and the color yc value indicate color coordinates when crossed, and the closer to 0, the better the numerical value. It can be seen that the polarizing plate according to the embodiment of the present invention has an xc value and a yc value close to zero, as shown in Table 1 below.
  • Example 1 115 44.6 0.589 98.508 -0.54 1.39 -0.13 -3.16 0.2525 0.2600
  • Example 2 117 44.9 0.617 98.456 -0.47 1.33 -0.07 -3.32 0.2520 0.2585
  • Example 3 113 44.8 0.600 98.493 -0.46 1.34 -0.06 -3.28 0.2522 0.2584
  • Example 4 111 44.8 0.571 98.567 -0.48 1.35 -0.17 -3.49 0.2464 0.2546 Comparative example 115 44.6 0.627 98.409 -0.49 1.51 -0.22 -2.59 0.2609 0.2704
  • the polarizers prepared in Examples 1-4 and Comparative Example were attached to Glass at a size of 2.5 cm x 5 cm, placed in an 85 ° C. chamber, and taken out after 500 hours to determine whether cracks were generated in the polarizer. The microscope confirmed it.
  • the optical film including the polarizing film according to the present invention includes a barrier layer containing a polyvinyl alcohol-based resin, it is possible to prevent the occurrence of cracks, it is very thin and excellent durability.

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  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
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Abstract

L'invention concerne un film optique et un procédé de fabrication du film optique. Le film optique peut comprendre : un film d'alcool polyvinylique sur lequel de l'iode ou un colorant dichroïque est adsorbé et orienté; et une couche barrière qui est formée sur au moins une surface du film d'alcool polyvinylique et contient une résine d'alcool polyvinylique.
PCT/KR2014/012325 2014-09-30 2014-12-15 Film optique et son procédé de fabrication Ceased WO2016052813A1 (fr)

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KR1020140131398A KR101737181B1 (ko) 2014-09-30 2014-09-30 광학 필름 및 그 제조방법
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KR20190077970A (ko) 2017-12-26 2019-07-04 주식회사 엘지화학 편광판 및 이를 포함하는 액정 표시 장치
WO2019135541A1 (fr) * 2018-01-02 2019-07-11 동우화인켐 주식회사 Plaque de polarisation et dispositif d'affichage d'image la comprenant
KR102522252B1 (ko) * 2019-06-26 2023-04-17 주식회사 엘지화학 편광판의 양품화 장치

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009300768A (ja) * 2008-06-13 2009-12-24 Sumitomo Chemical Co Ltd 偏光板ロールおよびそれを用いた感圧式接着剤層付き偏光板ロール、偏光板、液晶表示装置
JP2010042665A (ja) * 2008-07-15 2010-02-25 San Totsukusu Kk 基材フィルム
US20120113356A1 (en) * 2009-08-05 2012-05-10 Yu So-Hee Polarizing plate and liquid crystal display provided with the same
KR20130135670A (ko) * 2012-06-01 2013-12-11 주식회사 엘지화학 편광판용 접착제 및 이를 포함하는 편광판
KR20140063442A (ko) * 2012-11-16 2014-05-27 주식회사 엘지화학 박형 편광자의 제조 방법, 이를 이용하여 제조된 박형 편광자 및 편광판

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009300768A (ja) * 2008-06-13 2009-12-24 Sumitomo Chemical Co Ltd 偏光板ロールおよびそれを用いた感圧式接着剤層付き偏光板ロール、偏光板、液晶表示装置
JP2010042665A (ja) * 2008-07-15 2010-02-25 San Totsukusu Kk 基材フィルム
US20120113356A1 (en) * 2009-08-05 2012-05-10 Yu So-Hee Polarizing plate and liquid crystal display provided with the same
KR20130135670A (ko) * 2012-06-01 2013-12-11 주식회사 엘지화학 편광판용 접착제 및 이를 포함하는 편광판
KR20140063442A (ko) * 2012-11-16 2014-05-27 주식회사 엘지화학 박형 편광자의 제조 방법, 이를 이용하여 제조된 박형 편광자 및 편광판

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