WO2021070467A1 - Plaque de polarisation fixée à une couche à différence de phase et dispositif d'affichage électroluminescent organique l'utilisant - Google Patents

Plaque de polarisation fixée à une couche à différence de phase et dispositif d'affichage électroluminescent organique l'utilisant Download PDF

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WO2021070467A1
WO2021070467A1 PCT/JP2020/030573 JP2020030573W WO2021070467A1 WO 2021070467 A1 WO2021070467 A1 WO 2021070467A1 JP 2020030573 W JP2020030573 W JP 2020030573W WO 2021070467 A1 WO2021070467 A1 WO 2021070467A1
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Prior art keywords
layer
polarizing plate
moisture permeability
retardation layer
protective layer
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PCT/JP2020/030573
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English (en)
Japanese (ja)
Inventor
寛 友久
後藤　周作
一生 田中
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日東電工株式会社
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Priority claimed from JP2020087156A external-priority patent/JP2021063975A/ja
Application filed by 日東電工株式会社 filed Critical 日東電工株式会社
Priority to CN202080070457.3A priority Critical patent/CN114502998A/zh
Priority to KR1020227011468A priority patent/KR20220076468A/ko
Publication of WO2021070467A1 publication Critical patent/WO2021070467A1/fr

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    • 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
    • H10K59/87—Passivation; Containers; Encapsulations
    • H10K59/873—Encapsulations
    • 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
    • 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
    • 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
    • G02B5/3025—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
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
    • G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B33/00—Electroluminescent light sources
    • H05B33/02—Details
    • 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

Definitions

  • the present invention relates to a polarizing plate with a retardation layer and an organic electroluminescence (EL) display device using the same.
  • the present invention has been made to solve the above-mentioned conventional problems, and a main object thereof is to provide a polarizing plate with a retardation layer in which decolorization is remarkably suppressed when applied to an organic EL display device. is there.
  • the polarizing plate with a retardation layer of the present invention comprises a polarizing plate, a polarizing plate including a protective layer at least on the viewing side of the polarizing element, and a retardation layer arranged on the side opposite to the viewing side of the polarizing plate.
  • Moisture permeability of the protective layer of the viewing side is a 200g / m 2 ⁇ 24h or more, greater than the moisture permeability of the retardation layer.
  • the polarizing plate includes a protective layer only on the visual side.
  • the difference between the moisture permeability of the moisture permeability and the retardation layer of the protective layer of the viewing side is 200g / m 2 ⁇ 24h or more.
  • the polarizing plate further includes another protective layer on the side opposite to the visible side of the polarizer, and the moisture permeability of the protective layer on the visible side is the moisture permeability of the other protective layer and the moisture permeability of the other protective layer.
  • the moisture permeability of the retardation layer is larger than the smaller one.
  • the retardation layer is an orientation-solidified layer of a liquid crystal compound, and the moisture permeability of the protective layer on the visible side is larger than the moisture permeability of the other protective layer.
  • the difference between the moisture permeability of the protective layer on the visible side, the moisture permeability of the other protective layer, and the moisture permeability of the retardation layer, whichever is smaller, is 200 g / m 2.
  • the moisture permeability of the further protective layer is not more than 150g / m 2 ⁇ 24h.
  • the thickness of the polarizer is 8 ⁇ m or less.
  • the total thickness of the polarizing plate with a retardation layer is 20 ⁇ m or more and 100 ⁇ m or less.
  • an organic electroluminescent display device is provided. This organic electroluminescence display device includes the above-mentioned polarizing plate with a retardation layer.
  • the moisture permeability of the protective layer on the viewing side is the moisture permeability of the protective layer (if present) on the opposite side to the viewing side and the moisture permeability of the retardation layer.
  • Refractive index (nx, ny, nz) "Nx" is the refractive index in the direction in which the in-plane refractive index is maximized (that is, the slow-phase axis direction), and "ny” is the in-plane direction orthogonal to the slow-phase axis (that is, the phase-advance axis direction). Is the refractive index of, and "nz” is the refractive index in the thickness direction.
  • In-plane phase difference (Re) “Re ( ⁇ )” is an in-plane phase difference measured with light having a wavelength of ⁇ nm at 23 ° C.
  • Re (550) is an in-plane phase difference measured with light having a wavelength of 550 nm at 23 ° C.
  • Phase difference in the thickness direction (Rth) is a phase difference in the thickness direction measured with light having a wavelength of ⁇ nm at 23 ° C.
  • Rth (550) is a phase difference in the thickness direction measured with light having a wavelength of 550 nm at 23 ° C.
  • FIG. 1 is a schematic cross-sectional view of the polarizing plate with a retardation layer according to one embodiment of the present invention.
  • the polarizing plate 100 with a retardation layer in the illustrated example typically has a polarizing plate 10 and a retardation layer 20 in this order from the viewing side.
  • the polarizing plate 10 includes a polarizing element 11 and a protective layer (visible side protective layer) 12 at least on the viewing side of the polarizing element 11.
  • the protective layer (inner protective layer) 13 is provided on the side opposite to the visible side of the polarizer 11, but the protective layer 13 may be omitted depending on the purpose or the like.
  • the protective layer 13 may be omitted.
  • the retardation layer 20 is an orientation-solidified layer of a liquid crystal compound
  • a protective layer 13 is typically provided. Practically, an adhesive layer (not shown) is provided on the side opposite to the polarizing plate 10 of the retardation layer 20 (that is, as the outermost layer on the side opposite to the viewing side), and the polarizing plate with the retardation layer is organic. It is said that it can be pasted on an EL cell.
  • a release film is temporarily adhered to the surface of the pressure-sensitive adhesive layer until a polarizing plate with a retardation layer is used.
  • the release film By temporarily attaching the release film, the pressure-sensitive adhesive layer can be protected and a roll of the polarizing plate with a retardation layer can be formed.
  • the moisture permeability of the protective layer 12 is larger than the moisture permeability of the protective layer 13 (if present) and the moisture permeability of the retardation layer 20 whichever is smaller. Specifically: (1) When the protective layer 13 is omitted, the moisture permeability of the protective layer 12 is larger than the moisture permeability of the retardation layer 20; (2) When the protective layer 13 is present. , The moisture permeability of the protective layer 12 is larger than the moisture permeability of the protective layer 13 and the moisture permeability of the retardation layer 20, whichever is smaller; (3) The protective layer 13 is present and the retardation layer 20 is present.
  • the moisture permeability of the protective layer 12 is larger than the moisture permeability of the protective layer 13.
  • the present inventors faced a new problem that the polarizing plate with a retardation layer is decolorized when the polarizing plate with a retardation layer is applied to an organic EL display device, and as a result of diligent studies on the problem, the decolorization was performed. It was discovered that the cause was ammonia (substantially ammonium ions) generated from the organic EL panel.
  • the protective layer of the polarizer is designed to reduce the moisture permeability of the outer (visual side) protective layer because the main purpose is to protect the polarizer from moisture (water vapor).
  • the embodiment of the present invention is based on such a technical idea completely opposite to the common general technical knowledge in the art.
  • the difference between the smaller moisture permeability of the moisture permeability and moisture permeability of the phase difference layer 20 of the moisture permeability and the protective layer 13 of the protective layer 12 (if present) is preferably 200g / m 2 ⁇ 24h or more, more preferably 220g / m 2 ⁇ 24h or more, more preferably 250g / m 2 ⁇ 24h or more, and particularly preferably 300g / m 2 ⁇ 24h or more.
  • the upper limit of the difference may be, for example, 600g / m 2 ⁇ 24h. When the difference is within such a range, decolorization of the polarizing plate with a retardation layer can be suppressed more satisfactorily.
  • Moisture permeability of the protective layer 12 is 200g / m 2 ⁇ 24h or more, preferably 300g / m 2 ⁇ 24h or more, more preferably 330g / m 2 ⁇ 24h or more, more preferably 360 g / m 2 ⁇ 24h or more, particularly preferably 400 g / m 2 ⁇ 24h or more.
  • the upper limit of the moisture permeability of the protective layer 12 may be, for example, 650g / m 2 ⁇ 24h.
  • Moisture permeability of the protective layer 13 is preferably not more than 150g / m 2 ⁇ 24h, more preferably not more than 100g / m 2 ⁇ 24h, more preferably at 70g / m 2 ⁇ 24h or less, particularly preferably 50g / m is 2 ⁇ 24h or less.
  • Moisture permeability of the protective layer 13 is preferably as low, the lower limit can be, for example, 5g / m 2 ⁇ 24h.
  • the moisture permeability of the retardation layer 20 is preferably not more than 150g / m 2 ⁇ 24h, more preferably not more than 100g / m 2 ⁇ 24h, more preferably less 70g / m 2 ⁇ 24h, most preferably not more than 50g / m 2 ⁇ 24h.
  • the moisture permeability can be measured according to JIS Z 0208.
  • the total thickness of the polarizing plate with a retardation layer is preferably 120 ⁇ m or less, more preferably 100 ⁇ m or less, and further preferably 80 ⁇ m or less.
  • the lower limit of the total thickness is preferably 20 ⁇ m, more preferably 45 ⁇ m.
  • a polarizing plate with a retardation layer having such a total thickness can have extremely excellent flexibility and bending durability.
  • the polarizing plate with a retardation layer can be particularly preferably applied to a curved organic EL display device and / or a bendable or bendable organic EL display device.
  • the polarizing plate with a retardation layer may further include other optical functional layers.
  • the type, characteristics, number, combination, arrangement position, and the like of the optical functional layers that can be provided on the polarizing plate with the retardation layer can be appropriately set according to the purpose.
  • the polarizing plate with a retardation layer may further have a conductive layer or an isotropic base material with a conductive layer (neither is shown).
  • the conductive layer or the isotropic base material with the conductive layer is typically provided on the outside of the retardation layer 20 (opposite to the polarizing plate 10).
  • the polarizing plate with a retardation layer can be applied to a so-called inner touch panel type input display device in which a touch sensor is incorporated between the organic EL cell and the polarizing plate. ..
  • the polarizing plate with a retardation layer may further include other retardation layers.
  • the optical characteristics for example, refractive index characteristics, in-plane retardation, Nz coefficient, photoelastic coefficient
  • thickness, arrangement position, and the like of other retardation layers can be appropriately set according to the purpose.
  • the polarizing plate with a retardation layer may be single-wafered or elongated.
  • the term "long” means an elongated shape having a length sufficiently long with respect to the width, and for example, an elongated shape having a length of 10 times or more, preferably 20 times or more with respect to the width. Including.
  • the long-shaped polarizing plate with a retardation layer can be wound in a roll shape.
  • Polarizing plate B-1 Polarizer
  • any suitable polarizer can be adopted.
  • the resin film forming the polarizer may be a single-layer resin film or a laminated body having two or more layers.
  • the polarizer composed of a single-layer resin film include a hydrophilic polymer film such as a polyvinyl alcohol (PVA) -based film, a partially formalized PVA-based film, and an ethylene / vinyl acetate copolymer system partially saponified film.
  • a hydrophilic polymer film such as a polyvinyl alcohol (PVA) -based film, a partially formalized PVA-based film, and an ethylene / vinyl acetate copolymer system partially saponified film.
  • PVA polyvinyl alcohol
  • a partially formalized PVA-based film ethylene / vinyl acetate copolymer system partially saponified film
  • examples thereof include those which have been dyed and stretched with a bicolor substance such as iodine or a bicolor dye, and polyene-based oriented films such as a dehydrated product of PVA and a dehydrogenated product of polyvinyl chloride.
  • the above-mentioned dyeing with iodine is performed, for example, by immersing a PVA-based film in an aqueous iodine solution.
  • the draw ratio of the uniaxial stretching is preferably 3 to 7 times. Stretching may be performed after the dyeing treatment or while dyeing. Alternatively, it may be stretched and then dyed. If necessary, the PVA-based film is subjected to a swelling treatment, a cross-linking treatment, a washing treatment, a drying treatment and the like.
  • the polarizer obtained by using the laminate include a laminate of a resin base material and a PVA-based resin layer (PVA-based resin film) laminated on the resin base material, or a resin base material and the resin.
  • Examples thereof include a polarizer obtained by using a laminate with a PVA-based resin layer coated and formed on a base material.
  • the polarizer obtained by using the laminate of the resin base material and the PVA-based resin layer coated and formed on the resin base material is, for example, a resin base material obtained by applying a PVA-based resin solution to the resin base material and drying the resin base material.
  • stretching typically includes immersing the laminate in an aqueous boric acid solution for stretching. Further, stretching may further include, if necessary, stretching the laminate in the air at a high temperature (eg, 95 ° C. or higher) prior to stretching in boric acid aqueous solution.
  • a high temperature eg, 95 ° C. or higher
  • the obtained resin substrate / polarizer laminate may be used as it is (that is, the resin substrate may be used as a protective layer for the polarizer), and the resin substrate is peeled off from the resin substrate / polarizer laminate. Then, an arbitrary appropriate protective layer according to the purpose may be laminated on the peeled surface. Details of the method for producing such a polarizer are described in, for example, Japanese Patent Application Laid-Open No. 2012-73580 and Japanese Patent No. 6470455. The entire description of these publications is incorporated herein by reference.
  • the thickness of the polarizer is preferably 15 ⁇ m or less, more preferably 12 ⁇ m or less, further preferably 10 ⁇ m or less, and particularly preferably 8 ⁇ m or less.
  • the thickness of the polarizer is preferably 1 ⁇ m or more, more preferably 2 ⁇ m or more, and further preferably 3 ⁇ m or more.
  • the polarizer preferably exhibits absorption dichroism at any wavelength of 380 nm to 780 nm.
  • the simple substance transmittance of the polarizer is, for example, 41.5% to 46.0%, preferably 43.0% to 46.0%, and preferably 44.5% to 46.0%.
  • the degree of polarization of the polarizer is preferably 97.0% or more, more preferably 99.0% or more, and further preferably 99.9% or more.
  • the visible side protective layer 12 and the inner protective layer 13 are each composed of any suitable film that can be used as a protective layer for the polarizer as long as it has the above-mentioned moisture permeability.
  • Typical materials constituting the inner protective layer 13 include cycloolefin resins such as polycarbonate, (meth) acrylic resins, polyester resins such as polyethylene terephthalate (PET) and polyethylene naphthalate (PEN), and polyester resins such as polyethylene terephthalate (PEN). Examples thereof include polyolefin resins such as polyethylene and polycarbonate resins.
  • a typical example of the (meth) acrylic resin is a (meth) acrylic resin having a lactone ring structure.
  • the inner protective layer 13 is preferably composed of a cycloolefin-based resin.
  • Typical examples of the material constituting the visible side protective layer 12 include a cellulosic resin such as triacetyl cellulose (TAC) and a resin capable of forming a microporous film (for example, a polyurethane resin).
  • the polarizing plate with a retardation layer is typically arranged on the visible side of the organic EL display device, and the protective layer 12 is arranged on the visible side thereof. Therefore, the protective layer 12 may be subjected to surface treatment such as hard coat treatment, antireflection treatment, anti-sticking treatment, and anti-glare treatment, if necessary. Further / or, if necessary, the protective layer 12 is provided with a process for improving visibility when visually recognizing through polarized sunglasses (typically, a (elliptical) circularly polarized light function is provided, and an ultra-high phase difference is provided. May be given). By performing such a process, excellent visibility can be realized even when the display screen is visually recognized through a polarized lens such as polarized sunglasses. Therefore, the polarizing plate with a retardation layer can be suitably applied to an organic EL display device that can be used outdoors.
  • polarized sunglasses typically, a (elliptical) circularly polarized light function is provided, and an ultra-high phase difference is provided. May be
  • the thickness of the protective layer 12 can be appropriately set according to the desired moisture permeability.
  • the thickness of the protective layer 12 is preferably 10 ⁇ m to 80 ⁇ m, more preferably 15 ⁇ m to 70 ⁇ m, and even more preferably 20 ⁇ m to 50 ⁇ m.
  • the thickness of the protective layer 12 is a thickness including the thickness of the surface treatment layer.
  • the protective layer 13 is preferably optically isotropic in one embodiment.
  • 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 thickness of the protective layer 13 can also be appropriately set according to the desired moisture permeability.
  • the thickness of the protective layer 13 is preferably 10 ⁇ m to 80 ⁇ m, more preferably 20 ⁇ m to 70 ⁇ m, and even more preferably 30 ⁇ m to 50 ⁇ m.
  • the protective layer 13 may be preferably omitted from the viewpoint of thinning.
  • phase difference layer 20 may be a single layer or may have a laminated structure (substantially a two-layer structure).
  • the retardation layer 20 can typically function as a ⁇ / 4 plate.
  • the retardation layer is typically provided to impart antireflection characteristics to an organic EL display device.
  • the in-plane retardation Re (550) of the retardation layer is preferably 100 nm to 190 nm, more preferably 110 nm to 170 nm, and even more preferably 120 nm to 160 nm.
  • the Nz coefficient of the retardation layer is preferably 0.9 to 1.5, and more preferably 0.9 to 1.3. By satisfying such a relationship, an organic EL display device having a very excellent reflected hue can be obtained.
  • the retardation layer When the retardation layer is a single layer, the retardation layer preferably exhibits a reverse dispersion wavelength characteristic in which the retardation value increases according to the wavelength of the measurement light.
  • the Re (450) / Re (550) of the retardation layer is preferably 0.8 or more and less than 1, and more preferably 0.8 or more and 0.95 or less. With such a configuration, very excellent antireflection characteristics can be realized.
  • the angle formed by the slow axis of the retardation layer and the absorption axis of the polarizer is preferably 40 ° to 50 °, more preferably 42 ° to 48 °, and even more preferably about 45 °.
  • an organic EL display device having very excellent antireflection characteristics can be obtained by using the retardation layer as a ⁇ / 4 plate as described above.
  • the retardation layer can be made of any suitable material as long as the above characteristics can be satisfied.
  • the retardation layer may be a stretched film of a resin film, or may be an orientation-solidifying layer of a liquid crystal compound (hereinafter, a liquid crystal alignment solidification layer).
  • the resin constituting the resin film include a polycarbonate-based resin or a polyester carbonate-based resin (hereinafter, may be simply referred to as a polycarbonate-based resin).
  • a polycarbonate-based resin any suitable polycarbonate-based resin can be used as long as the desired moisture permeability can be obtained.
  • the polycarbonate-based resin contains a structural unit derived from a fluorene-based dihydroxy compound, a structural unit derived from an isosorbide-based dihydroxy compound, an alicyclic diol, an alicyclic dimethanol, di, tri or polyethylene glycol, and an alkylene.
  • the polycarbonate-based resin is a structural unit derived from a fluorene-based dihydroxy compound, a structural unit derived from an isosorbide-based dihydroxy compound, a structural unit derived from an alicyclic dimethanol, and / or di, tri or polyethylene glycol.
  • the polycarbonate-based resin may contain structural units derived from other dihydroxy compounds, if necessary.
  • the retardation layer can be formed by stretching a film made of the above-mentioned polycarbonate resin under arbitrary suitable stretching conditions.
  • a film made of the above-mentioned polycarbonate resin under arbitrary suitable stretching conditions.
  • the retardation layer is a liquid crystal oriented solidified layer
  • the difference between nx and ny of the obtained retardation layer can be remarkably increased as compared with the non-liquid crystal material by using the liquid crystal compound, so that the desired surface can be obtained.
  • the thickness of the retardation layer for obtaining the inner retardation can be remarkably reduced.
  • the term "aligned solidified layer” refers to a layer in which a liquid crystal compound is oriented in a predetermined direction within the layer and the oriented state is fixed.
  • the "oriented solidified layer” is a concept including an oriented cured layer obtained by curing a liquid crystal monomer.
  • the rod-shaped liquid crystal compounds are typically oriented in a state of being aligned in the slow axis direction of the retardation layer (homogeneous orientation).
  • specific examples of the liquid crystal compound and details of the method for forming the liquid crystal oriented solidified layer are described in, for example, JP-A-2006-163343 and JP-A-2006-178389. The descriptions in these publications are incorporated herein by reference.
  • the thickness of the retardation layer can be typically set to a thickness that can properly function as a ⁇ / 4 plate.
  • the thickness of the retardation layer can be, for example, 10 ⁇ m to 60 ⁇ m.
  • the thickness of the retardation layer can be, for example, 1 ⁇ m to 5 ⁇ m.
  • the retardation layer When the retardation layer has a laminated structure, the retardation layer typically has a two-layer structure of a first liquid crystal oriented solidified layer and a second liquid crystal oriented solidified layer.
  • either one of the first liquid crystal oriented solidified layer or the second liquid crystal oriented solidified layer can function as a ⁇ / 2 plate, and the other can function as a ⁇ / 4 plate.
  • the case where the first liquid crystal oriented solidified layer can function as a ⁇ / 2 plate and the second liquid crystal oriented solidified layer can function as a ⁇ / 4 plate will be described, but these may be reversed. ..
  • the thickness of the first liquid crystal oriented solidified layer can be adjusted so as to obtain a desired in-plane phase difference of the ⁇ / 2 plate, and can be, for example, 2.0 ⁇ m to 4.0 ⁇ m.
  • the thickness of the second liquid crystal oriented solidified layer can be adjusted so as to obtain the desired in-plane phase difference of the ⁇ / 4 plate, and can be, for example, 1.0 ⁇ m to 2.5 ⁇ m.
  • the in-plane retardation Re (550) of the first liquid crystal oriented solidified layer is preferably 200 nm to 300 nm, more preferably 230 nm to 290 nm, and further preferably 250 nm to 280 nm.
  • the in-plane retardation Re (550) of the second liquid crystal oriented solidified layer is preferably 100 nm to 190 nm, more preferably 110 nm to 170 nm, and further preferably 120 nm to 160 nm.
  • the angle formed by the slow axis of the first liquid crystal oriented solidified layer and the absorption axis of the polarizer is preferably 10 ° to 20 °, more preferably 12 ° to 18 °, and even more preferably about 15 °. Is.
  • the angle formed by the slow axis of the second liquid crystal oriented solidified layer and the absorption axis of the polarizer is preferably 70 ° to 80 °, more preferably 72 ° to 78 °, and even more preferably about 75 °. Is. With such a configuration, it is possible to obtain characteristics close to the ideal reverse wavelength dispersion characteristic, and as a result, it is possible to realize extremely excellent antireflection characteristics.
  • an embodiment of the present invention includes an organic EL display device using such a polarizing plate with a retardation layer.
  • the organic EL display device according to the embodiment of the present invention includes the polarizing plate with a retardation layer according to the above items A to C on the visible side thereof.
  • the polarizing plate with a retardation layer is laminated so that the retardation layer is on the organic EL cell side (the polarizing plate is on the visual recognition side).
  • the organic EL display device has a curved shape (substantially a curved display screen) and / or is bendable or bendable.
  • the present inventors use a polarizing plate with a retardation layer due to ammonia (substantially ammonium ions) generated from the organic EL panel.
  • ammonia substantially ammonium ions
  • Polarization degree P (%) ⁇ (Tp-Tc) / (Tp + Tc) ⁇ 1/2 ⁇ 100 (3) Moisture Permeability Measured according to JIS Z 0208. Specifically, the protective layer or the retardation layer (the film constituting the layer) used in Examples and Comparative Examples was cut out in a circle of 10 cm ⁇ and used as a measurement sample. The moisture permeability of this measurement sample was measured using "MOCON" manufactured by Hitachi, Ltd. under the test conditions of 40 ° C. and 92% RH. (4) Ammonia decolorization test 10 g of a 10% aqueous ammonia solution was placed in a glass bottle (cylindrical shape having a diameter of 30 mm and a depth of 50 mm).
  • the distance from the liquid level of the aqueous ammonia solution to the mouth (upper end) of the glass bottle was about 30 mm.
  • the polarizing plates with retardation layers obtained in Examples and Comparative Examples were cut out to a size of 15 mm ⁇ 15 mm, and an adhesive layer was provided on the retardation layer side to use as measurement data.
  • the measurement material was attached to the edge of the mouth of the glass bottle via the adhesive layer so that the mouth of the glass bottle was completely covered with this measurement material and steam did not leak through the gap.
  • the glass bottle covered with the measurement material was heated at 60 ° C. for 2 hours.
  • thermoplastic resin base material an amorphous isophthal copolymer polyethylene terephthalate film (thickness: 100 ⁇ m) having a long shape, a water absorption of 0.75%, and a Tg of about 75 ° C. was used.
  • One side of the resin base material was corona-treated.
  • a PVA aqueous solution (coating solution) was prepared by dissolving 13 parts by weight of potassium iodide in water.
  • the PVA aqueous solution was applied to the corona-treated surface of the resin base material and dried at 60 ° C. to form a PVA-based resin layer having a thickness of 13 ⁇ m to prepare a laminate.
  • the obtained laminate was uniaxially stretched at the free end 2.4 times in the longitudinal direction (longitudinal direction) between rolls having different peripheral speeds in an oven at 130 ° C. (aerial auxiliary stretching treatment). Next, the laminate was immersed in an insolubilizing bath at a liquid temperature of 40 ° C.
  • HC-TAC film was attached to the surface of the polarizer of the resin base material / polarizer laminate obtained above via an ultraviolet curable adhesive. Specifically, the curable adhesive was coated so as to have a thickness of 1.0 ⁇ m, and bonded using a roll machine. Then, UV light was irradiated from the HC-TAC film side to cure the adhesive.
  • the HC-TAC film is a film in which a hard coat (HC) layer (thickness 7 ⁇ m) is formed on a triacetyl cellulose (TAC) film (thickness 25 ⁇ m), and the TAC film is attached so as to be on the polarizer side. I matched it.
  • a cycloolefin-based resin film (thickness 13 ⁇ m: hereinafter, COP film) was attached to the peeled surface in the same manner as described above.
  • Moisture permeability of HC-TAC film was 427g / m 2 ⁇ 24h, moisture permeability of the COP film was 35g / m 2 ⁇ 24h.
  • a polarizing plate having a structure of a visible side protective layer (HC-TAC film) / a polarizer / another protective layer (COP film) was obtained.
  • the temperature rise and depressurization in the second reactor were started, and the internal temperature was 240 ° C. and the pressure was 0.2 kPa in 50 minutes. Then, the polymerization was allowed to proceed until the stirring power became a predetermined value. When the predetermined power was reached, nitrogen was introduced into the reactor to repressurize, the produced polyester carbonate-based resin was extruded into water, and the strands were cut to obtain pellets.
  • the Re (550) of the obtained retardation film was 141 nm, the Re (450) / Re (550) was 0.82, and the Nz coefficient was 1.12. Further, the moisture permeability of the obtained retardation film was 75g / m 2 ⁇ 24h.
  • Example 2 1. Preparation of Polarizing Plate A polarizing plate was prepared in the same manner as in Example 1.
  • liquid crystal oriented solidified layer constituting the retardation layer 55 parts of the compound represented by the formula (I), 25 parts of the compound represented by the formula (II), and 20 parts of the compound represented by the formula (III) are cyclopenta. After adding to 400 parts of non (CPN), heat to 60 ° C. to dissolve by stirring, and after confirmation of dissolution, return to room temperature, and return to room temperature, 3 parts of Irgacure 907 (manufactured by BASF Japan Co., Ltd.), Megafuck F- 0.2 part of 554 (manufactured by DIC Corporation) and 0.1 part of p-methoxyphenol (MEHQ) were added, and the mixture was further stirred to obtain a solution. The solution was clear and uniform.
  • the obtained solution was filtered through a 0.20 ⁇ m membrane filter to obtain a polymerizable composition.
  • a polyimide solution for an alignment film was applied to a glass substrate having a thickness of 0.7 mm by a spin coating method, dried at 100 ° C. for 10 minutes, and then fired at 200 ° C. for 60 minutes to obtain a coating film. ..
  • the obtained coating film was subjected to a rubbing treatment to form an alignment film. The rubbing treatment was performed using a commercially available rubbing device.
  • the polymerizable composition obtained above was applied to a base material (substantially an alignment film) by a spin coating method, and dried at 100 ° C. for 2 minutes.
  • the obtained coating film was cooled to room temperature and then irradiated with ultraviolet rays at an intensity of 30 mW / cm 2 for 30 seconds using a high-pressure mercury lamp to obtain a liquid crystal oriented solidified layer.
  • the in-plane retardation Re (550) of the liquid crystal oriented solidified layer was 130 nm.
  • the Re (450) / Re (550) of the liquid crystal oriented solidified layer was 0.851, showing the inverse dispersion wavelength characteristic.
  • Example 3 A polarizing plate with a retardation layer was obtained in the same manner as in Example 1 except that a separate protective layer was not provided. The obtained polarizing plate with a retardation layer was subjected to the same evaluation as in Example 1. The results are shown in Table 1.
  • Example 4 A polarizing plate with a retardation layer was obtained with the structure shown in Table 1 for the viewing side protective layer, the polarizer, another protective layer, and the retardation layer.
  • the obtained polarizing plate with a retardation layer was subjected to the same evaluation as in Example 1. The results are shown in Table 1.
  • Example 1 A resin base material / polarizer laminate was produced in the same manner as in Example 1. An HC-COP film was attached to the surface of the polarizer of the obtained resin base material / polarizer laminate in the same manner as in Example 1.
  • the HC-COP film is a film in which a hard coat (HC) layer (thickness 2 ⁇ m) is formed on a COP film (thickness 25 ⁇ m), and the COP film is bonded so as to be on the polarizer side.
  • the resin base material was peeled off, and a COP film similar to that in Example 1 was attached to the peeled surface in the same manner as in Example 1.
  • Moisture permeability of HC-COP film is 17g / m 2 ⁇ 24h, moisture permeability of the COP film was 35g / m 2 ⁇ 24h.
  • a polarizing plate having a structure of a visible side protective layer (HC-COP film) / a polarizer / another protective layer (COP film) was obtained.
  • the following procedure was the same as in Example 1 to obtain a polarizing plate with a retardation layer.
  • the obtained polarizing plate with a retardation layer was subjected to the same evaluation as in Example 1. The results are shown in Table 1.
  • the polarizing plate with a retardation layer of the present invention is suitably used as an antireflection circular polarizing plate of an organic EL display device.
  • Polarizing plate 11 Polarizer 12 Protective layer 13 Protective layer 20 Phase difference layer 100 Polarizing plate with retardation layer

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Polarising Elements (AREA)
  • Electroluminescent Light Sources (AREA)

Abstract

L'invention concerne une plaque de polarisation fixée à une couche à différence de phase qui a une décoloration remarquablement supprimée lorsqu'elle est appliquée à un dispositif d'affichage électroluminescent organique. Cette plaque de polarisation fixée à une couche à différence de phase comprend : une plaque de polarisation comprenant un polariseur et une couche de protection disposée sur au moins un côté de visualisation du polariseur ; et une couche à différence de phase disposée sur le côté inverse du côté de visualisation de la plaque de polarisation. La perméabilité à l'humidité de la couche protectrice sur le côté de visualisation est d'au moins 200 g/m2•24h, et est supérieure à la perméabilité à l'humidité de la couche à différence de phase.
PCT/JP2020/030573 2019-10-10 2020-08-11 Plaque de polarisation fixée à une couche à différence de phase et dispositif d'affichage électroluminescent organique l'utilisant WO2021070467A1 (fr)

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CN202080070457.3A CN114502998A (zh) 2019-10-10 2020-08-11 带相位差层的偏振片及使用其的有机电致发光显示设备
KR1020227011468A KR20220076468A (ko) 2019-10-10 2020-08-11 위상차층 부착 편광판 및 이를 이용한 유기 일렉트로루미네센스 표시 장치

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JP2005338736A (ja) * 2004-05-31 2005-12-08 Fuji Photo Film Co Ltd 偏光板、偏光板一体型光学補償フィルム、液晶表示装置および自発光型表示装置
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