WO2017169168A1 - 光学補償層付偏光板およびそれを用いた有機ｅｌパネル - Google Patents

光学補償層付偏光板およびそれを用いた有機ｅｌパネル Download PDF

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Publication number
WO2017169168A1
WO2017169168A1 PCT/JP2017/004894 JP2017004894W WO2017169168A1 WO 2017169168 A1 WO2017169168 A1 WO 2017169168A1 JP 2017004894 W JP2017004894 W JP 2017004894W WO 2017169168 A1 WO2017169168 A1 WO 2017169168A1
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Prior art keywords
optical compensation
compensation layer
layer
polarizer
polarizing plate
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PCT/JP2017/004894
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English (en)
French (fr)
Japanese (ja)
Inventor
敏行 飯田
寛教 柳沼
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Nitto Denko Corp
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Nitto Denko Corp
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Priority to SG11201808229XA priority Critical patent/SG11201808229XA/en
Priority to US16/086,378 priority patent/US10989853B2/en
Priority to CN201780016527.5A priority patent/CN108780174B/zh
Priority to KR1020187026054A priority patent/KR102669108B1/ko
Publication of WO2017169168A1 publication Critical patent/WO2017169168A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • G02B5/3025—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
    • 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
    • H10K59/8791—Arrangements for improving contrast, e.g. preventing reflection of ambient light
    • 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
    • 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
    • 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
    • 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
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K50/00—Organic light-emitting devices
    • H10K50/80—Constructional details
    • H10K50/86—Arrangements for improving contrast, e.g. preventing reflection of ambient light
    • 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

Definitions

  • the present invention relates to a polarizing plate with an optical compensation layer and an organic EL panel using the same.
  • the present invention has been made in order to solve the above-described conventional problems, and its main purpose is to maintain excellent antireflection characteristics in the front direction and excellent antireflection characteristics in the oblique direction. It is an object of the present invention to provide a polarizing plate with an optical compensation layer that can realize excellent antireflection characteristics over a wide wavelength band and has a neutral hue in an oblique direction.
  • the polarizing plate with an optical compensation layer of the present invention is used for an organic EL panel.
  • This polarizing plate with an optical compensation layer includes a polarizer, a first optical compensation layer, a second optical compensation layer, and a third optical compensation layer.
  • the first optical compensation layer, the second optical compensation layer, and the third optical compensation layer all exhibit refractive index characteristics of nx>nz> ny.
  • the first optical compensation layer, the second optical compensation layer, and the third optical compensation layer all satisfy the relationship of Re (450) ⁇ Re (550).
  • Re (450) and Re (550) represent in-plane phase differences measured with light having wavelengths of 450 nm and 550 nm at 23 ° C., respectively.
  • Re (550) of the first optical compensation layer is 230 nm to 310 nm, and an Nz coefficient is 0.1 to 0.4, and the absorption axis of the polarizer and the first It is substantially orthogonal to the slow axis of one optical compensation layer.
  • Re (550) of the second optical compensation layer is 210 nm to 270 nm, and an Nz coefficient is 0.3 to 0.7, and the absorption axis of the polarizer and the first optical compensation layer The angle between the optical compensation layer 2 and the slow axis is 5 ° to 25 °, 65 ° to 85 °, 95 ° to 115 °, or 155 ° to 175 °.
  • Re (550) of the third optical compensation layer is 80 nm to 160 nm, and an Nz coefficient is 0.3 to 0.7, and the absorption axis of the polarizer and the first optical compensation layer The angle between the optical compensation layer 3 and the slow axis is 5 ° to 25 °, 65 ° to 85 °, 95 ° to 115 °, or 155 ° to 175 °.
  • an organic EL panel is provided. This organic EL panel includes the above polarizing plate with an optical compensation layer.
  • the polarizing plate with an optical compensation layer by using three optical compensation layers each having a refractive index characteristic of nx> nz> ny, while maintaining excellent antireflection characteristics in the front direction, it is also possible to obtain a polarizing plate with an optical compensation layer that has excellent antireflection characteristics in the oblique direction, and that such excellent antireflection characteristics can be realized over a wide wavelength band and that the hue in the oblique direction is neutral. it can.
  • Refractive index (nx, ny, nz) “Nx” is the refractive index in the direction in which the in-plane refractive index is maximum (ie, the slow axis direction), and “ny” is the direction orthogonal to the slow axis in the plane (ie, the fast axis direction). “Nz” is the refractive index in the thickness direction.
  • Refractive index (nx, ny, nz) “Nx” is the refractive index in the direction in which the in-plane refractive index is maximum (ie, the slow axis direction), and “ny” is the direction orthogonal to the slow axis in the plane (ie, the fast axis direction). “Nz” is the refractive index in the thickness direction.
  • In-plane retardation (Re) “Re ( ⁇ )” is an in-plane retardation measured with light having a wavelength of ⁇ nm at 23 ° C.
  • Re (550) is an in-plane retardation measured with light having a wavelength of 550 nm at 23 ° C.
  • Thickness direction retardation (Rth) is a retardation in the thickness direction measured with light having a wavelength of ⁇ nm at 23 ° C.
  • Rth (550) is a retardation in the thickness direction measured with light having a wavelength of 550 nm at 23 ° C.
  • Substantially orthogonal or parallel include the case where the angle between the two directions is 90 ° ⁇ 10 °, preferably 90 ° ⁇ 7 °. And more preferably 90 ° ⁇ 5 °.
  • substantially parallel and “substantially parallel” include the case where the angle between two directions is 0 ° ⁇ 10 °, preferably 0 ° ⁇ 7 °, more preferably 0 ° ⁇ 5 °.
  • orthogonal or “parallel” may include a substantially orthogonal state or a substantially parallel state.
  • A. 1 is a schematic sectional view of a polarizing plate with an optical compensation layer according to one embodiment of the present invention.
  • the polarizing plate 100 with an optical compensation layer of this embodiment includes a polarizer 10, a first optical compensation layer 30, a second optical compensation layer 40, and a third optical compensation layer 50.
  • the protective layer 20 can be provided on the opposite side of the polarizer 10 from the first optical compensation layer 30 as in the illustrated example.
  • the polarizing plate with an optical compensation layer may include another protective layer (also referred to as an inner protective layer) between the polarizer 10 and the first optical compensation layer 30.
  • the inner protective layer is omitted.
  • the first optical compensation layer 30 can also function as an inner protective layer.
  • the polarizing plate with an optical compensation layer can be further reduced in thickness.
  • a conductive layer and a base material may be provided in this order on the opposite side of the third optical compensation layer 50 from the second optical compensation layer 40 (that is, outside the third optical compensation layer 50). Good (both not shown).
  • the base material is closely adhered to the conductive layer.
  • adhered to the conductive layer “adhesion lamination” means that two layers are directly and firmly laminated without an adhesive layer (for example, an adhesive layer or an adhesive layer).
  • the conductive layer and the base material can be typically introduced into the polarizing plate 100 with an optical compensation layer as a laminate of the base material and the conductive layer.
  • the first optical compensation layer 30, the second optical compensation layer 40, and the third optical compensation layer 50 each exhibit a refractive index characteristic of nx> nz> ny.
  • nx> nz> ny By using three optical compensation layers exhibiting refractive index characteristics of nx> nz> ny, an excellent antireflection characteristic in the front direction due to an excellent circular polarization function is maintained, and the polarizer when viewed from an oblique direction is maintained.
  • excellent antireflection characteristics are realized in the oblique direction. Neutral (ie undesired uncolored) hues in the direction can be achieved.
  • Each of the first optical compensation layer 30, the second optical compensation layer 40, and the third optical compensation layer 50 typically has a positive chromatic dispersion characteristic in which the phase difference value decreases according to the wavelength of the measurement light, Alternatively, it exhibits a flat wavelength dispersion characteristic in which the phase difference value hardly changes depending on the wavelength of the measurement light.
  • each optical compensation layer can be formed of the same material. More specifically, each of the first optical compensation layer 30, the second optical compensation layer 40, and the third optical compensation layer 50 preferably satisfies the relationship of Re (450) ⁇ Re (550), and more preferably. Further satisfies the relationship of Re (550) ⁇ Re (650).
  • the 1st optical compensation layer 30, the 2nd optical compensation layer 40, and the 3rd optical compensation layer 50 show the same wavelength dispersion characteristic. Since the three optical compensation layers have the same wavelength dispersion characteristic, the material selection of each optical compensation layer is further facilitated.
  • the first optical compensation layer 30 has an in-plane retardation Re (550) of preferably 230 nm to 310 nm.
  • the Nz coefficient of the first optical compensation layer is preferably 0.1 to 0.4.
  • the slow axis of the first optical compensation layer 30 and the absorption axis of the polarizer 10 are preferably substantially orthogonal.
  • the Nz coefficient of the first optical compensation layer is preferably between 0.6 and 0.9. In this case, the slow axis of the first optical compensation layer 30 and the absorption axis of the polarizer 10 are preferably substantially parallel.
  • the second optical compensation layer 40 has an in-plane retardation Re (550) of preferably 210 nm to 270 nm and an Nz coefficient of preferably 0.3 to 0.7.
  • the third optical compensation layer 50 has an in-plane retardation Re (550) of preferably 80 nm to 160 nm and an Nz coefficient of preferably 0.3 to 0.7.
  • the angle formed by the slow axis of the second optical compensation layer 40 and the absorption axis of the polarizer 10 is preferably 65 ° to 85 ° or 155 ° to 175 °.
  • the angle formed by the slow axis of the third optical compensation layer 50 and the absorption axis of the polarizer 10 is preferably 5 ° to 25 ° or 95 ° to 115 °.
  • the angle formed by the slow axis of the second optical compensation layer 40 and the absorption axis of the polarizer 10 is preferably 5 ° to 25 ° or 95 ° to 115 °.
  • the angle formed by the slow axis of the third optical compensation layer 50 and the absorption axis of the polarizer 10 is preferably 65 ° to 85 ° or 155 ° to 175 °.
  • each optical compensation layer when the absorption axis direction of the polarizer is 0 °.
  • the slow axis directions are as follows: polarizer (0 °) / first optical compensation layer (90 °) / second optical compensation layer (75 °) / third optical compensation layer (15 °).
  • a first optical compensation layer 30, a second optical compensation layer 40, and a third optical compensation layer 50 are arranged in this order from the polarizer 10 side.
  • the resin film forming the polarizer may be a single-layer resin film or a laminate of two or more layers.
  • polarizers composed of a single-layer resin film include hydrophilic polymer films such as polyvinyl alcohol (PVA) films, partially formalized PVA films, and ethylene / vinyl acetate copolymer partially saponified films.
  • PVA polyvinyl alcohol
  • polyene-based oriented films such as those subjected to dyeing treatment and stretching treatment with dichroic substances such as iodine and dichroic dyes, PVA dehydrated products and polyvinyl chloride dehydrochlorinated products.
  • a polarizer obtained by dyeing a PVA film with iodine and uniaxially stretching is used because of excellent optical properties.
  • the dyeing with iodine is performed, for example, by immersing a PVA film in an aqueous iodine solution.
  • the stretching ratio of the uniaxial stretching is preferably 3 to 7 times.
  • the stretching may be performed after the dyeing treatment or may be performed while dyeing. Moreover, you may dye
  • the PVA film is subjected to swelling treatment, crosslinking treatment, washing treatment, drying treatment and the like. For example, by immersing the PVA film in water and washing it before dyeing, not only can the surface of the PVA film be cleaned of dirt and anti-blocking agents, but the PVA film can be swollen to cause uneven staining. Can be prevented.
  • a polarizer obtained by using a laminate a laminate of a resin substrate and a PVA resin layer (PVA resin film) laminated on the resin substrate, or a resin substrate and the resin
  • a polarizer obtained by using a laminate with a PVA resin layer applied and formed on a substrate examples thereof include a polarizer obtained by using a laminate with a PVA resin layer applied and formed on a substrate.
  • a polarizer obtained by using a laminate of a resin base material and a PVA resin layer applied and formed on the resin base material may be obtained by, for example, applying a PVA resin solution to a resin base material and drying it.
  • a PVA-based resin layer is formed thereon to obtain a laminate of a resin base material and a PVA-based resin layer; the laminate is stretched and dyed to make the PVA-based resin layer a polarizer; obtain.
  • stretching typically includes immersing the laminate in an aqueous boric acid solution and stretching.
  • the stretching may further include, if necessary, stretching the laminate in the air at a high temperature (for example, 95 ° C. or higher) before stretching in the aqueous boric acid solution.
  • the obtained resin base material / polarizer laminate may be used as it is (that is, the resin base material may be used as a protective layer of the polarizer), and the resin base material is peeled from the resin base material / polarizer laminate.
  • Any appropriate protective layer according to the purpose may be laminated on the release surface. Details of a method for manufacturing such a polarizer are described in, for example, Japanese Patent Application Laid-Open No. 2012-73580. This publication is incorporated herein by reference in its entirety.
  • the thickness of the polarizer is preferably 25 ⁇ m or less, more preferably 1 ⁇ m to 12 ⁇ m, still more preferably 3 ⁇ m to 12 ⁇ m, and particularly preferably 3 ⁇ m to 8 ⁇ m.
  • the thickness of the polarizer is in such a range, curling during heating can be satisfactorily suppressed, and good appearance durability during heating can be obtained.
  • the polarizer preferably exhibits absorption dichroism at any wavelength between 380 nm and 780 nm.
  • the single transmittance of the polarizer is preferably 42.0% to 46.0%, more preferably 44.5% to 46.0%.
  • the polarization degree of the polarizer is preferably 97.0% or more, more preferably 99.0% or more, and further preferably 99.9% or more.
  • the first optical compensation layer 30 has a relationship of refractive index characteristics of nx>nz> ny.
  • the in-plane retardation Re (550) of the first optical compensation layer is preferably 230 nm to 310 nm, more preferably 240 nm to 300 nm, and further preferably 260 nm to 280 nm. If the in-plane retardation of the first optical compensation layer is in such a range, the polarizer is made by making the slow axis of the first optical compensation layer substantially orthogonal to the absorption axis of the polarizer. It is possible to prevent a decrease in the antireflection function in the oblique direction due to the apparent axial deviation of the absorption axis.
  • the Nz coefficient of the first optical compensation layer is preferably 0.1 to 0.4, more preferably 0.2 to 0.3, and even more preferably 0.23 to 0.27. If the Nz coefficient is in such a range, by combining the slow axis of the first optical compensation layer and the absorption axis of the polarizer substantially orthogonally, combined with the effect of the in-plane retardation, Better oblique antireflection properties can be achieved.
  • the Nz coefficient of the first optical compensation layer is preferably 0.6 to 0.9, more preferably 0.7 to 0.8, and still more preferably 0.73 to 0.93. 0.77. If the Nz coefficient is in such a range, the same effect can be achieved by making the slow axis of the first optical compensation layer and the absorption axis of the polarizer substantially parallel.
  • the first optical compensation layer is preferably a positive chromatic dispersion characteristic in which the phase difference value decreases according to the wavelength of the measurement light, or a flat in which the phase difference value hardly changes depending on the wavelength of the measurement light. Chromatic dispersion characteristics. Since the first optical compensation layer exhibits such wavelength dispersion characteristics, it is possible to widen the band by a laminated configuration with other optical compensation layers.
  • the first optical compensation layer preferably satisfies the relationship of Re (450) ⁇ Re (550).
  • Re (450) / Re (550) is preferably 1.00 to 1.20, more preferably 1.00 to 1.15.
  • the first optical compensation layer preferably satisfies the relationship of Re (550) ⁇ Re (650).
  • Re (550) / Re (650) is preferably 1.00 to 1.11, more preferably 1.00 to 1.08.
  • the first optical compensation layer is typically a retardation film formed of any appropriate resin capable of realizing the above characteristics.
  • the resin forming the retardation film include polyarylate, polyamide, polyimide, polyester, polyaryletherketone, polyamideimide, polyesterimide, polyvinyl alcohol, polyfumaric acid ester, polyethersulfone, polysulfone, and norbornene resin.
  • a polycarbonate resin, a cellulose resin, and a polyurethane are mentioned. These resins may be used alone or in combination.
  • Polyarylate or polycarbonate resin is preferable, and polycarbonate resin or polyarylate represented by the following formula (I) is more preferable.
  • a and B each represent a substituent, which is a halogen atom, an alkyl group having 1 to 6 carbon atoms, or a substituted or unsubstituted aryl group, and A and B are the same or different. Also good. a and b represent the corresponding numbers of substitutions of A and B, and are integers of 1 to 4, respectively.
  • D is a covalent bond, CH 2 group, C (CH 3 ) 2 group, C (CZ 3 ) 2 group (where Z is a halogen atom), CO group, O atom, S atom, SO 2 group, Si (CH 2 CH 3 ) 2 groups and N (CH 3 ) groups.
  • R1 is a linear or branched alkyl group having 1 to 10 carbon atoms, or a substituted or unsubstituted aryl group.
  • R2 is a linear or branched alkyl group having 2 to 10 carbon atoms, or a substituted or unsubstituted aryl group.
  • R3, R4, R5 and R6 are each independently a hydrogen atom or a linear or branched alkyl group having 1 to 4 carbon atoms, and R3, R4, R5 and R6 may be the same or different.
  • p1 is an integer of 0 to 3
  • p2 is an integer of 1 to 3
  • n is an integer of 2 or more.
  • the first optical compensation layer can be formed, for example, by applying a coating solution obtained by dissolving or dispersing the resin in any appropriate solvent to a shrinkable film to form a coating film, and then shrinking the coating film. .
  • a coating solution obtained by dissolving or dispersing the resin in any appropriate solvent
  • the laminate of the contractible film and the coating film is heated to contract the contractible film, and the contraction of the contractible film causes the coating film to contract.
  • the shrinkage ratio of the coating film is preferably 0.50 to 0.99, more preferably 0.60 to 0.98, and still more preferably 0.70 to 0.95.
  • the heating temperature is preferably 130 ° C. to 170 ° C., more preferably 150 ° C. to 160 ° C.
  • a layered product when shrinking a coating film, may be extended in the direction orthogonal to the shrinkage direction.
  • the stretch ratio of the laminate is preferably 1.01 to 3.0 times, more preferably 1.05 to 2.0 times, and even more preferably 1.10 times to 1.50. Is double.
  • the material constituting the shrinkable film include polyolefin, polyester, acrylic resin, polyamide, polycarbonate, norbornene resin, polystyrene, polyvinyl chloride, polyvinylidene chloride, cellulose resin, polyethersulfone, polysulfone, polyimide, polyacrylic. , Acetate resin, polyarylate, polyvinyl alcohol, and liquid crystal polymer. These may be used alone or in combination.
  • the shrinkable film is preferably a stretched film formed from these materials.
  • the first optical compensation layer is formed by pasting a shrinkable film using, for example, an acrylic adhesive on one or both sides of a film formed of the resin, and then heating the laminate to shrink the laminate. Can be formed.
  • the thickness of the first optical compensation layer is preferably 10 ⁇ m to 150 ⁇ m, more preferably 10 ⁇ m to 50 ⁇ m, and further preferably 10 ⁇ m to 30 ⁇ m. With such a thickness, the desired in-plane retardation and Nz coefficient can be obtained.
  • the second optical compensation layer 40 has a refractive index characteristic of nx>nz> ny.
  • the angle formed by the slow axis of the second optical compensation layer 40 and the absorption axis of the polarizer 10 is preferably 65 ° to 85 °, more preferably 70 °, as described above. It is ⁇ 80 °, more preferably 73 ° to 77 °, and particularly preferably about 75 °.
  • the angle is preferably 155 ° to 175 °, more preferably 160 ° to 170 °, and still more preferably 163 ° to 167 °, as described above. Particularly preferred is about 165 °.
  • the angle formed between the slow axis of the second optical compensation layer 40 and the absorption axis of the polarizer 10 is preferably 5 ° to 25 °, more preferably 10 °, as described above. It is ⁇ 20 °, more preferably 13 ° to 17 °, and particularly preferably about 15 °. In another example of the present embodiment, the angle is preferably 95 ° to 115 °, more preferably 100 ° to 110 °, and still more preferably 103 ° to 107 °, as described above. Particularly preferred is about 105 °. By setting the angle in such a range, a more excellent antireflection characteristic in an oblique direction can be achieved by a synergistic effect with the effect of the in-plane retardation and Nz coefficient of the second optical compensation layer. .
  • the in-plane retardation Re (550) of the second optical compensation layer is preferably 210 nm to 270 nm, more preferably 220 nm to 260 nm, and further preferably 230 nm to 250 nm.
  • the Nz coefficient of the second optical compensation layer is preferably 0.3 to 0.7, more preferably 0.4 to 0.6, still more preferably 0.45 to 0.55, and particularly Preferably it is about 0.5. If the Nz coefficient of the second optical compensation layer is in such a range, the angle formed by the slow axis of the second optical compensation layer and the absorption axis of the polarizer is, for example, 65 ° to 85 ° (as described above). In particular, by setting the angle to about 75 ° or 155 ° to 175 ° (particularly, about 165 °), it is possible to achieve better antireflection characteristics in an oblique direction combined with the effect of the in-plane retardation.
  • the second optical compensation layer is preferably a positive chromatic dispersion characteristic in which the phase difference value decreases according to the wavelength of the measurement light, or a flat in which the phase difference value hardly changes depending on the wavelength of the measurement light. Chromatic dispersion characteristics. Since the second optical compensation layer exhibits such a wavelength dispersion characteristic, it is possible to widen the band by a laminated configuration with other optical compensation layers.
  • the second optical compensation layer preferably satisfies the relationship of Re (450) ⁇ Re (550).
  • Re (450) / Re (550) is preferably 1.00 to 1.20, more preferably 1.00 to 1.15.
  • the second optical compensation layer preferably satisfies the relationship of Re (550) ⁇ Re (650).
  • Re (550) / Re (650) is preferably 1.00 to 1.11, more preferably 1.00 to 1.08.
  • the thickness of the second optical compensation layer is preferably 10 ⁇ m to 150 ⁇ m, more preferably 10 ⁇ m to 50 ⁇ m, and further preferably 10 ⁇ m to 30 ⁇ m. With such a thickness, the desired in-plane retardation and Nz coefficient can be obtained.
  • the constituent material and the forming method of the second optical compensation layer are as described in the above section A-2 for the first optical compensation layer.
  • the third optical compensation layer 50 has a relationship of refractive index characteristics of nx>nz> ny.
  • the angle formed by the slow axis of the third optical compensation layer 50 and the absorption axis of the polarizer 10 is preferably 5 ° to 25 °, more preferably 10 °, as described above. It is ⁇ 20 °, more preferably 13 ° to 17 °, and particularly preferably about 15 °.
  • the angle is preferably 95 ° to 115 °, more preferably 100 ° to 110 °, and still more preferably 103 ° to 107 °, as described above. Particularly preferred is about 105 °.
  • the angle formed by the slow axis of the third optical compensation layer 50 and the absorption axis of the polarizer 10 is preferably 65 ° to 85 °, more preferably 70 °, as described above. It is ⁇ 80 °, more preferably 73 ° to 77 °, and particularly preferably about 75 °.
  • the angle is preferably 155 ° to 175 °, more preferably 160 ° to 170 °, and still more preferably 163 ° to 167 °, as described above. Particularly preferred is about 165 °.
  • the in-plane retardation Re (550) of the third optical compensation layer is preferably 80 nm to 160 nm, more preferably 100 nm to 140 nm, and still more preferably 110 nm to 130 nm.
  • the Nz coefficient of the third optical compensation layer is preferably 0.3 to 0.7, more preferably 0.4 to 0.6, still more preferably 0.45 to 0.55, and particularly Preferably it is about 0.5. If the Nz coefficient of the third optical compensation layer is in such a range, the angle formed by the slow axis of the third optical compensation layer and the absorption axis of the polarizer is, for example, 5 ° to 25 ° (as described above). In particular, by setting the angle to about 15 ° or 95 ° to 115 ° (particularly, around 105 °), it is possible to achieve more excellent antireflection characteristics in the oblique direction in combination with the effect of the in-plane retardation.
  • the third optical compensation layer is preferably a positive chromatic dispersion characteristic in which the phase difference value decreases according to the wavelength of the measurement light, or a flat in which the phase difference value hardly changes depending on the wavelength of the measurement light. Chromatic dispersion characteristics. Since the third optical compensation layer exhibits such a wavelength dispersion characteristic, it is possible to widen the band by a laminated configuration with other optical compensation layers.
  • the third optical compensation layer preferably satisfies the relationship of Re (450) ⁇ Re (550).
  • Re (450) / Re (550) is preferably 1.00 to 1.20, more preferably 1.00 to 1.15.
  • the third optical compensation layer preferably satisfies the relationship of Re (550) ⁇ Re (650).
  • Re (550) / Re (650) is preferably 1.00 to 1.11, more preferably 1.00 to 1.08.
  • the thickness of the third optical compensation layer is preferably 5 ⁇ m to 150 ⁇ m, more preferably 5 ⁇ m to 50 ⁇ m, and further preferably 5 ⁇ m to 30 ⁇ m. With such a thickness, the desired in-plane retardation and Nz coefficient can be obtained.
  • the constituent material and the formation method of the third optical compensation layer are as described in the above section A-2 for the first optical compensation layer.
  • the protective layer 20 is formed of any suitable film that can be used as a protective layer for a polarizer.
  • the material as the main component of the film include cellulose resins such as triacetyl cellulose (TAC), polyester-based, polyvinyl alcohol-based, polycarbonate-based, polyamide-based, polyimide-based, polyethersulfone-based, and polysulfone-based materials.
  • transparent resins such as polystyrene, polynorbornene, polyolefin, (meth) acryl, and acetate.
  • thermosetting resins such as (meth) acrylic, urethane-based, (meth) acrylurethane-based, epoxy-based, and silicone-based or ultraviolet curable resins are also included.
  • a glassy polymer such as a siloxane polymer is also included.
  • a polymer film described in JP-A-2001-343529 (WO01 / 37007) can also be used.
  • a resin composition containing a thermoplastic resin having a substituted or unsubstituted imide group in the side chain and a thermoplastic resin having a substituted or unsubstituted phenyl group and nitrile group in the side chain for example, a resin composition having an alternating copolymer of isobutene and N-methylmaleimide and an acrylonitrile / styrene copolymer can be mentioned.
  • the polymer film can be, for example, an extruded product of the resin composition.
  • the protective layer 20 may be subjected to a surface treatment such as a hard coat treatment, an antireflection treatment, an antisticking treatment, and an antiglare treatment as necessary. Further / or, if necessary, the protective layer 20 may be treated to improve visibility when viewed through polarized sunglasses (typically, an (elliptical) circular polarization function is imparted, an ultrahigh phase difference is provided. May be applied). By performing such processing, excellent visibility can be achieved even when the display screen is viewed through a polarizing lens such as polarized sunglasses. Therefore, the polarizing plate with an optical compensation layer can be suitably applied to an image display device that can be used outdoors.
  • polarized sunglasses typically, an (elliptical) circular polarization function is imparted, an ultrahigh phase difference is provided. May be applied.
  • the thickness of the protective layer 20 is typically 5 mm or less, preferably 1 mm or less, more preferably 1 ⁇ m to 500 ⁇ m, and even more preferably 5 ⁇ m to 150 ⁇ m.
  • the thickness of the protective layer is a thickness including the thickness of the surface treatment layer.
  • the inner protective layer is preferably optically isotropic.
  • “optically isotropic” means that the in-plane retardation Re (550) is 0 nm to 10 nm and the thickness direction retardation Rth (550) is ⁇ 10 nm to +10 nm.
  • the inner protective layer can be composed of any suitable material as long as it is optically isotropic. The material may be appropriately selected from the materials described above for the protective layer 20, for example.
  • the thickness of the inner protective layer is preferably 5 ⁇ m to 200 ⁇ m, more preferably 10 ⁇ m to 100 ⁇ m, and still more preferably 15 ⁇ m to 95 ⁇ m.
  • Conductive layer or conductive layer with substrate can be formed on any suitable substrate by any suitable film formation method (eg, vacuum deposition, sputtering, CVD, ion plating, spraying, etc.). Further, it can be formed by forming a metal oxide film. After film formation, heat treatment (for example, 100 ° C. to 200 ° C.) may be performed as necessary. By performing the heat treatment, the amorphous film can be crystallized.
  • the metal oxide include indium oxide, tin oxide, zinc oxide, indium-tin composite oxide, tin-antimony composite oxide, zinc-aluminum composite oxide, and indium-zinc composite oxide.
  • the indium oxide may be doped with divalent metal ions or tetravalent metal ions.
  • Indium composite oxides are preferable, and indium-tin composite oxide (ITO) is more preferable.
  • ITO indium-tin composite oxide
  • Indium composite oxides are characterized by high transmittance (for example, 80% or more) in the visible light region (380 nm to 780 nm) and low surface resistance per unit area.
  • the thickness of the conductive layer is preferably 50 nm or less, more preferably 35 nm or less.
  • the lower limit of the thickness of the conductive layer is preferably 10 nm.
  • the surface resistance value of the conductive layer is preferably 300 ⁇ / ⁇ or less, more preferably 150 ⁇ / ⁇ or less, and further preferably 100 ⁇ / ⁇ or less.
  • the conductive layer may be transferred from the base material to the third optical compensation layer, and the conductive layer alone may be used as a constituent layer of the polarizing plate with an optical compensation layer, or a laminate with the base material (conductive layer with base material). May be laminated on the third optical compensation layer.
  • the conductive layer and the base material can be introduced into the polarizing plate with an optical compensation layer as a conductive layer with a base material.
  • Any suitable resin may be used as the material constituting the base material.
  • it is resin excellent in transparency.
  • Specific examples include cyclic olefin resins, polycarbonate resins, cellulose resins, polyester resins, and acrylic resins.
  • the substrate is optically isotropic. Therefore, the conductive layer can be used as a conductive layer with an isotropic substrate in a polarizing plate with an optical compensation layer.
  • the material constituting the optically isotropic substrate include, for example, a material having a main skeleton such as a norbornene-based resin or an olefin-based resin, a lactone ring, or glutar Examples thereof include materials having a cyclic structure such as an imide ring in the main chain of the acrylic resin. When such a material is used, when an isotropic substrate is formed, it is possible to suppress the expression of the phase difference accompanying the orientation of the molecular chain.
  • the thickness of the substrate is preferably 10 ⁇ m to 200 ⁇ m, more preferably 20 ⁇ m to 60 ⁇ m.
  • the pressure-sensitive adhesive layer is typically formed of an acrylic pressure-sensitive adhesive.
  • the adhesive layer is typically formed of a polyvinyl alcohol-based adhesive.
  • an adhesive layer may be provided on the third optical compensation layer 50 side of the polarizing plate 100 with the optical compensation layer.
  • the pressure-sensitive adhesive layer By providing the pressure-sensitive adhesive layer in advance, it can be easily bonded to another optical member (for example, an organic EL cell).
  • the peeling film is bonded together on the surface of this adhesive layer until it uses.
  • the organic EL panel of the present invention includes an organic EL cell and the polarizing plate with an optical compensation layer described in the above section A on the viewing side of the organic EL cell.
  • the polarizing plate with an optical compensation layer is laminated so that the third optical compensation layer is on the organic EL cell side (so that the polarizer is on the viewing side).
  • the present invention will be specifically described by way of examples, but the present invention is not limited to these examples.
  • the measuring method of each characteristic is as follows.
  • Thickness The thickness was measured using a dial gauge (manufactured by PEACOCK, product name “DG-205”, dial gauge stand (product name “pds-2”)).
  • Retardation A 50 mm ⁇ 50 mm sample was cut out from each optical compensation layer to obtain a measurement sample, and measurement was performed using Axoscan manufactured by Axometrics. The measurement wavelength was 450 nm, 550 nm, and the measurement temperature was 23 ° C.
  • the average refractive index was measured using an Abbe refractometer manufactured by Atago Co., Ltd., and the refractive indexes nx, ny, and nz were calculated from the obtained retardation values.
  • the front reflection hue was evaluated as ⁇ u′v ′ (neutral) from the neutral point, and the oblique hue was evaluated as a color shift ⁇ u′v ′ at a polar angle of 60 ° and an azimuth angle of 0 ° to 360 °.
  • the polycondensation solution was allowed to stand and separate to separate a toluene solution containing polyarylate.
  • the separation liquid was washed with acetic acid water and further washed with ion exchange water, and then poured into methanol to precipitate polyarylate.
  • the precipitated polyarylate was filtered and dried under reduced pressure to obtain 34.1 kg of white polyarylate (yield 92%).
  • the birefringence ( ⁇ n xz ) of the polyarylate was 0.012.
  • the weight ratio of iodine and potassium iodide is 1: 7, the iodine concentration of which is adjusted so that the single transmittance of the obtained polarizer is 45.0%.
  • the film was stretched 1.4 times.
  • the crosslinking treatment employed a two-stage crosslinking treatment, and the first-stage crosslinking treatment was stretched 1.2 times while being treated in an aqueous solution in which boric acid and potassium iodide were dissolved at 40 ° C.
  • the boric acid content of the aqueous solution of the first-stage crosslinking treatment was 5.0% by weight, and the potassium iodide content was 3.0% by weight.
  • the cross-linking treatment at the second stage was stretched 1.6 times while being treated in an aqueous solution in which boric acid and potassium iodide were dissolved at 65 ° C.
  • the boric acid content of the aqueous solution of the second crosslinking treatment was 4.3% by weight, and the potassium iodide content was 5.0% by weight.
  • the cleaning treatment was performed with an aqueous potassium iodide solution at 20 ° C.
  • the potassium iodide content of the aqueous solution for the washing treatment was 2.6% by weight.
  • the drying process was performed at 70 ° C. for 5 minutes to obtain a polarizer.
  • V Production of Polarizing Plate HC-TAC film (thickness: having a hard coat (HC) layer formed on one side of the TAC film by a hard coat treatment on one side of the polarizer via a polyvinyl alcohol-based adhesive. 32 ⁇ m, corresponding to the protective layer) was bonded by roll-to-roll to obtain a long polarizing plate having a protective layer / polarizer configuration.
  • the cutting of the first optical compensation layer is performed so that the absorption axis of the polarizer and the slow axis of the first optical compensation layer are substantially orthogonal to each other in the polarizing plate with the optical compensation layer;
  • the compensation layer is cut so that the angle formed by the absorption axis of the polarizer and the slow axis of the second optical compensation layer is 75 °;
  • the third optical compensation layer is cut by the absorption axis of the polarizer.
  • the slow axis of the third optical compensation layer were set to 15 °.
  • Example 2 The absorption axis of the polarizer and the slow axis of the second optical compensation layer are 15 °, and the absorption axis of the polarizer and the slow axis of the third optical compensation layer are 75 °.
  • an organic EL panel was produced in the same manner as in Example 1 except that this polarizing plate with an optical compensation layer was used.
  • the obtained polarizing plate with an optical compensation layer and the organic EL panel were subjected to the same evaluation as in Example 1. The results are shown in Table 1.
  • the polarizing plate with an optical compensation layer of the example of the present invention is excellent in both antireflection characteristics (reflection intensity) and reflection hue both in the front direction and in the oblique direction.
  • the polarizing plate with an optical compensation layer of the present invention is suitably used for an organic EL panel.

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  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • General Physics & Mathematics (AREA)
  • Polarising Elements (AREA)
  • Electroluminescent Light Sources (AREA)
PCT/JP2017/004894 2016-03-30 2017-02-10 光学補償層付偏光板およびそれを用いた有機ｅｌパネル Ceased WO2017169168A1 (ja)

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