CN114502998A - Polarizing plate with retardation layer and organic electroluminescent display device using the same - Google Patents
Polarizing plate with retardation layer and organic electroluminescent display device using the same Download PDFInfo
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- CN114502998A CN114502998A CN202080070457.3A CN202080070457A CN114502998A CN 114502998 A CN114502998 A CN 114502998A CN 202080070457 A CN202080070457 A CN 202080070457A CN 114502998 A CN114502998 A CN 114502998A
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Images
Classifications
-
- 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
Abstract
The invention provides a polarizing plate with a retardation layer, which is remarkably inhibited from discoloring when applied to an organic EL display device. The polarizing plate with a retardation layer of the present invention comprises a polarizing plate comprising a polarizer and a protective layer at least on the viewing side of the polarizer, and a retardation layer disposed on the viewing side of the polarizing plateThe opposite side. The moisture permeability of the protective layer on the visible side was 200g/m224h or more and greater than the moisture permeability of the retardation layer.
Description
Technical Field
The present invention relates to a polarizing plate with a retardation layer and an organic Electroluminescent (EL) display device using the same.
Background
In recent years, along with the spread of thin displays, a display (organic EL display device) having an organic EL panel mounted thereon has been proposed. Since the organic EL panel has a metal layer with high reflectivity, problems such as reflection of external light and reflection of a background tend to occur. Therefore, it is known that these problems can be prevented by providing a circularly polarizing plate on the visible side (for example, patent documents 1 to 3). However, the circularly polarizing plate provided in the organic EL display device has a problem of being easily discolored.
Documents of the prior art
Patent document
Patent document 1: japanese patent laid-open publication No. 2003-311239
Patent document 2: japanese patent laid-open publication No. 2002-372622
Patent document 3: japanese patent No. 3325560
Disclosure of Invention
Technical problem to be solved by the invention
The present invention has been made to solve the above-described conventional problems, and a main object thereof is to provide a polarizing plate with a retardation layer in which discoloration is significantly suppressed when applied to an organic EL display device.
Means for solving the problems
The polarizing plate with a retardation layer of the present invention includes a polarizing plate including a polarizer and a protective layer at least on a viewing side of the polarizer, and the retardation layer is disposed on an opposite side of the viewing side of the polarizing plate. The moisture permeability of the protective layer on the visible side is 200g/m224h or more and greater than the moisture permeability of the retardation layer.
In one embodiment, the polarizing plate includes a protective layer only on the visible side.
In one embodiment, the moisture permeability of the protective layer on the visible side and the phase difference are the sameThe difference in the moisture permeability of the layers was 200g/m224h or more.
In one embodiment, the polarizing plate further includes another protective layer on the opposite side of the visible side of the polarizer, and the moisture permeability of the protective layer on the visible side is higher than the lower moisture permeability of the other protective layer and the moisture permeability of the retardation layer. In one embodiment, the retardation layer is an oriented cured layer of a liquid crystal compound, and the moisture permeability of the protective layer on the visible side is higher than the moisture permeability of the other protective layer. In one embodiment, the difference between the moisture permeability of the visible-side protective layer and the smaller one of the moisture permeability of the other protective layer and the moisture permeability of the retardation layer is 200g/m224h or more.
In one embodiment, the other protective layer has a moisture permeability of 150g/m224h or less.
In one embodiment, the polarizer has a thickness of 8 μm or less.
In one embodiment, the total thickness of the polarizing plate with a retardation layer is 20 to 100 μm.
According to another aspect of the present invention, there is provided an organic electroluminescent display device. The organic electroluminescent display device comprises the polarizing plate with the phase difference layer.
Effects of the invention
According to the embodiment of the present invention, in the retardation-layer-attached polarizing plate, the moisture permeability of the visible-side protective layer is made larger than the smaller moisture permeability of the protective layer (when present) on the opposite side to the visible side and the moisture permeability of the retardation layer, whereby the retardation-layer-attached polarizing plate in which discoloration is significantly suppressed when applied to an organic EL display device can be realized.
Drawings
Fig. 1 is a schematic cross-sectional view of a polarizing plate with a retardation layer according to an embodiment of the present invention.
Detailed Description
Embodiments of the present invention will be described below, but the present invention is not limited to these embodiments.
(definitions of wording and symbols)
The terms and symbols in the present specification are defined as follows.
(1) Refractive index (nx, ny, nz)
"nx" is a refractive index in a direction in which the in-plane refractive index is maximum (i.e., the slow axis direction), "ny" is a refractive index in a direction orthogonal to the slow axis in the plane (i.e., the fast axis direction), and "nz" is a refractive index in the thickness direction.
(2) In-plane retardation (Re)
"Re (. lamda)" is an in-plane retardation measured at 23 ℃ with light having a wavelength of. lamda.nm. For example, "Re (550)" is an in-plane retardation measured at 23 ℃ with light having a wavelength of 550 nm. When the thickness of the layer (film) is d (nm), Re (λ) is expressed by the following formula: re (λ) ═ (nx-ny) × d.
(3) Retardation in thickness direction (Rth)
"Rth (λ)" is a phase difference in the thickness direction measured at 23 ℃ with light having a wavelength of λ nm. For example, "Rth (550)" is a phase difference in the thickness direction measured at 23 ℃ with light having a wavelength of 550 nm. When the thickness of the layer (film) is d (nm), Rth (λ) is expressed by the following formula: rth (λ) ═ n x z × d was determined.
(4) Coefficient of Nz
The Nz coefficient is obtained by Nz ═ Rth/Re.
(5) Angle of rotation
When an angle is referred to in the present specification, the angle includes both a clockwise direction and a counterclockwise direction with respect to a reference direction. Thus, for example, "45" means ± 45 °.
A. Integral constitution of polarizing plate with phase difference layer
Fig. 1 is a schematic cross-sectional view of a polarizing plate with a retardation layer according to an embodiment of the present invention. The polarizing plate with a retardation layer 100 illustrated in the figure typically includes a polarizing plate 10 and a retardation layer 20 in this order from the viewing side. The polarizing plate 10 includes a polarizer 11 and a protective layer (visible-side protective layer) 12 located at least on the visible side of the polarizer 11. In the illustrated example, the protective layer (inner protective layer) 13 is provided on the opposite side of the polarizer 11 from the viewing side, but the protective layer 13 may be omitted depending on the purpose. For example, when the retardation layer 20 is formed of an extended film of a resin film and can also serve as a protective layer for a polarizer, the protective layer 13 may be omitted. On the other hand, when the retardation layer 20 is an alignment cured layer of a liquid crystal compound, the protective layer 13 is typically provided. Practically, an adhesive layer (not shown) is provided on the side of the retardation layer 20 opposite to the polarizing plate 10 (i.e., as the outermost layer on the side opposite to the viewing side), and the polarizing plate with the retardation layer can be attached to the organic EL unit. Further, it is preferable that a release film is temporarily adhered to the surface of the pressure-sensitive adhesive layer before the polarizing plate with the retardation layer is used. By temporarily adhering the release film, the polarizing plate with the retardation layer can be formed in a roll shape while protecting the pressure-sensitive adhesive layer.
In the embodiment of the present invention, the moisture permeability of the protective layer 12 is higher than the lower moisture permeability of the protective layer 13 (when present) and the moisture permeability of the retardation layer 20. Specifically, the following are described: (1) when the protective layer 13 is omitted, the moisture permeability of the protective layer 12 is greater than that of the retardation layer 20; (2) when the protective layer 13 is present, the moisture permeability of the protective layer 12 is greater than the smaller moisture permeability of the protective layer 13 and the moisture permeability of the retardation layer 20; (3) when the protective layer 13 is present and the retardation layer 20 is an alignment cured layer of a liquid crystal compound, the moisture permeability of the protective layer 12 is greater than that of the protective layer 13. The present inventors have made extensive studies on a new problem that "when a polarizing plate with a retardation layer is applied to an organic EL display device, the polarizing plate with a retardation layer is discolored", and as a result, it has been found that ammonia (substantially ammonium ions) is generated from an organic EL panel as a cause of the discoloration. Further, a method of suppressing discoloration due to ammonia has been intensively studied, and as a result, it has been found that the discoloration can be significantly suppressed by blocking as much as possible the ammonium ions to be intruded into the polarizer and discharging the ammonium ions having been intruded as much as possible. Based on this finding, the new problem is solved by reducing the moisture permeability of the protective layer or retardation layer on the side opposite to the viewing side (the organic EL panel side), thereby blocking as much as possible the ammonium ions that are about to enter the polarizer, and by increasing the moisture permeability on the viewing side (the side farther from the organic EL panel), thereby allowing as much as possible the ammonium ions that have entered to be discharged. Further, the protective layer of the polarizer is mainly intended to protect the polarizer from moisture (water vapor), and therefore is designed to reduce the moisture permeability of the protective layer on the outer side (visible side), and the embodiment of the present invention is completed based on such a technical idea that is completely contrary to the technical common knowledge in the industry.
The difference between the moisture permeability of the protective layer 12 and the smaller of the moisture permeability of the protective layer 13 (when present) and the moisture permeability of the retardation layer 20 is more preferably 200g/m224h or more, more preferably 220g/m224h or more, more preferably 250g/m224h or more, particularly preferably 300g/m224h or more. The upper limit of the difference may be 600g/m, for example224 h. When the difference is within such a range, discoloration of the polarizing plate with a retardation layer can be further favorably suppressed.
The moisture permeability of the protective layer 12 is 200g/m224h or more, preferably 300g/m224h or more, more preferably 330g/m224h or more, more preferably 360g/m224h or more, particularly preferably 400g/m224h or more. The upper limit of the moisture permeability of the protective layer 12 may be 650g/m, for example224 h. The moisture permeability of the protective layer 13 is more preferably 150g/m224h or less, more preferably 100g/m224h or less, more preferably 70g/m224h or less, particularly preferably 50g/m224h or less. The lower the moisture permeability of the protective layer 13 is, the more preferable, the lower limit thereof may be, for example, 5g/m224 h. When the protective layer 13 is not present or when the moisture permeability of the retardation layer 20 is smaller than that of the protective layer 13, the moisture permeability of the retardation layer 20 is preferably 150g/m224h or less, more preferably 100g/m224h or less, more preferably 70g/m224h or less, particularly preferably 50g/m224h or less. The lower the moisture permeability of the retardation layer 20 is, the more preferable, the lower limit thereof may be, for example, 5g/m224 h. If the moisture permeability of the protective layers 12 and 13 and the retardation layer 20 is in such a range, the difference in moisture permeability is easily brought within a desired range. The moisture permeability can be measured according to JIS Z0208.
The total thickness of the polarizing plate with a retardation layer is preferably 120 μm or less, more preferably 100 μm or less, and still more preferably 80 μm or less. The lower limit of the total thickness is preferably 20 μm, more preferably 45 μm. The polarizing plate having the retardation layer with the total thickness can have extremely excellent flexibility and bending durability. As a result, the polarizing plate with a retardation layer is particularly suitable for 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 comprise 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 a retardation layer can be appropriately set according to the purpose. For example, the polarizing plate with a retardation layer may further have a conductive layer or an isotropic substrate with a conductive layer (both not shown). The conductive layer or the isotropic substrate with the conductive layer is typically provided outside the retardation layer 20 (on the side opposite to the polarizing plate 10). When a conductive layer or an isotropic substrate with a conductive layer is provided, a polarizing plate with a retardation layer can be applied to a so-called internal touch panel type input display device in which a touch sensor is assembled between an organic EL unit and a polarizing plate. In addition, for example, the polarizing plate with a retardation layer may further contain another retardation layer. The optical properties (e.g., refractive index properties, in-plane retardation, Nz coefficient, optical modulus), thickness, arrangement position, and the like of the other retardation layer are appropriately set depending on the purpose.
The polarizing plate with a retardation layer may be in the form of a single sheet or in the form of a long strip. In the present specification, the "elongated shape" refers to an elongated shape having a length sufficiently long with respect to a width, and includes, for example, an elongated shape having a length 10 times or more, more preferably 20 times or more with respect to a width. The long polarizing plate with a retardation layer can be wound in a roll shape.
The constituent elements of the polarizing plate with a retardation layer will be described in more detail below.
B. Polarizing plate
B-1 polarizer
Any suitable polarizer may be used as the polarizer 11. For example, the resin film forming the polarizer may be a single-layer resin film or a laminate of two or more layers.
Specific examples of the polarizer made of a single-layer resin film include: polyvinyl alcohol (PVA) -based films, partially formalized PVA-based films, partially saponified ethylene-vinyl acetate copolymer-based films, and other hydrophilic polymer films, are subjected to dyeing treatment with a dichroic substance such as iodine or a dichroic dye and stretching treatment, and polyene-based alignment films such as dehydrated PVA products and dehydrochlorinated polyvinyl chloride products. From the viewpoint of excellent optical properties, it is preferable to use a polarizer obtained by dyeing a PVA-based film with iodine and uniaxially stretching the film.
The dyeing with iodine is performed by, for example, immersing the PVA-based film in an aqueous iodine solution. The stretching ratio of the uniaxial stretching is more preferably 3 to 7 times. The extension may be performed after the dyeing treatment or while dyeing. In addition, dyeing after elongation is also possible. The PVA film is subjected to swelling treatment, crosslinking treatment, washing treatment, drying treatment, and the like as necessary. For example, by immersing the PVA-based film in water and washing it with water before dyeing, not only stains or antiblocking agents on the surface of the PVA-based film can be washed, but also the PVA-based film can be swollen to prevent uneven dyeing and the like.
Specific examples of the polarizer obtained using the laminate include polarizers obtained using a laminate of a resin substrate and a PVA-based resin layer (PVA-based resin film) laminated on the resin substrate, or a laminate of a resin substrate and a PVA-based resin layer formed by coating the resin substrate. A polarizer obtained using a laminate of a resin substrate and a PVA-based resin layer formed by coating the resin substrate can be produced, for example, as follows: coating a PVA-based resin solution on a resin base material, and drying the coating to form a PVA-based resin layer on the resin base material, thereby obtaining a laminate of the resin base material and the PVA-based resin layer; the laminate is stretched and dyed to make the PVA resin layer a polarizer. In the present embodiment, the stretching typically includes stretching the laminate by immersing it in an aqueous solution of boric acid. Further, with respect to the extension, it may further include, as necessary: the laminate is subjected to in-air stretching at high temperature (e.g., 95 ℃ or higher) prior to stretching in an aqueous boric acid solution. 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 a polarizer), or the resin substrate may be peeled from the resin substrate/polarizer laminate and an arbitrary appropriate protective layer may be laminated on the peeled surface as necessary. Details of the method for producing such a polarizer are described in, for example, japanese patent laid-open nos. 2012 and 73580 and 6470455. All the descriptions of these publications are incorporated herein by reference.
The thickness of the polarizer is preferably 15 μm or less, more preferably 12 μm or less, still more preferably 10 μm or less, and particularly preferably 8 μm or less. On the other hand, the thickness of the polarizer is preferably 1 μm or more, more preferably 2 μm or more, and further preferably 3 μm or more. When the thickness of the polarizer is in such a range, curling during heating can be favorably suppressed, and favorable appearance durability can be obtained during heating.
The polarizer preferably exhibits absorption dichroism at any wavelength from 380nm to 780 nm. The single transmittance of the polarizer is, for example, 41.5% to 46.0%, preferably 43.0% to 46.0%, and 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.
B-2 protective layer
Each of the visible-side protective layer 12 and the inner protective layer 13 (when present) is composed of any appropriate film that can be used as a protective layer for a polarizer, as long as it has the moisture permeability as described above. As the material constituting the inner protective layer 13, there are typically mentioned: a cycloolefin resin such as polynorbornene, a (meth) acrylic resin, a polyester resin such as polyethylene terephthalate (PET) or polyethylene naphthalate (PEN), a polyolefin resin such as polyethylene, or a polycarbonate resin. As a representative example of the (meth) acrylic resin, a (meth) acrylic resin having a lactone ring structure can be cited. The (meth) acrylic resin having a lactone ring structure is described in, for example, Japanese patent laid-open Nos. 2000-230016, 2001-151814, 2002-120326, 2002-254544 and 2005-146084. These publications are incorporated herein by reference. The inner protective layer 13 is preferably made of a cycloolefin resin. As materials constituting the visible-side protective layer 12, there are typically mentioned: cellulose resin such as triacetyl cellulose (TAC), and resin (for example, polyurethane resin) capable of forming a microporous film.
The polarizing plate with a retardation layer is typically disposed on the viewing side of the organic EL display device, and the protective layer 12 is disposed on the viewing side thereof, as described below. Therefore, the protective layer 12 is subjected to surface treatment such as hard coating treatment, antireflection treatment, anti-sticking treatment, and antiglare treatment as needed. When the image is viewed through the polarized sunglasses, the protective layer 12 is further/or if necessary subjected to a treatment for improving visibility (typically, a (elliptical) circularly polarized light function is provided, and an ultra-high phase difference is provided). By performing such a process, excellent visibility can be achieved even when the display screen is viewed through a polarized light lens such as a polarized sunglass. Therefore, the polarizing plate with a retardation layer is also suitably used for an organic EL display device that can be used outdoors.
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 μm to 80 μm, more preferably 15 μm to 70 μm, and still more preferably 20 μm to 50 μm. When the surface treatment is performed, 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. In the present specification, "optically isotropic" means that the in-plane retardation Re (550) is from 0nm to 10nm, and the retardation Rth (550) in the thickness direction is from-10 nm to +10 nm. The thickness of the protective layer 13 may be set as appropriate in accordance with the desired moisture permeability. The thickness of the protective layer 13 is preferably 10 μm to 80 μm, more preferably 20 μm to 70 μm, and still more preferably 30 μm to 50 μm. When the retardation layer 20 is an extended film of a resin film, the protective layer 13 is more preferably omitted from the viewpoint of reduction in thickness.
C. Retardation layer
The retardation layer 20 may be a single layer or may have a laminated structure (substantially a two-layer structure).
When the retardation layer 20 is a single layer, the retardation layer 20 can typically function as a λ/4 plate. The phase difference layer is typically designed to impart antireflection characteristics to the organic EL display device. The retardation layer typically has refractive index characteristics satisfying a relationship of nx > ny ═ nz. The in-plane retardation Re (550) of the retardation layer is preferably 100nm to 190nm, more preferably 110nm to 170nm, and still more preferably 120nm to 160 nm. Here, "ny ═ nz" includes not only cases where ny and nz are completely equal but also cases where ny and nz are substantially equal. Therefore, there may be a case where ny > nz or ny < nz within a range not impairing the effects of the present invention.
The Nz coefficient of the retardation layer is preferably 0.9 to 1.5, more preferably 0.9 to 1.3. By satisfying such a relationship, an organic EL display device having a very excellent reflection hue can be obtained.
When the retardation layer is a single layer, the retardation layer preferably exhibits inverse wavelength dispersion characteristics in which the phase difference value increases according to the wavelength of the measurement light. In this case, Re (450)/Re (550) of the retardation layer is preferably 0.8 or more and less than 1, and more preferably 0.8 to 0.95. With this configuration, very excellent antireflection characteristics can be achieved.
The angle formed by the slow axis of the phase difference layer and the absorption axis of the polarizer is preferably 40 ° to 50 °, more preferably 42 ° to 48 °, and still more preferably about 45 °. When the angle is in such a range, an organic EL display device having very excellent antireflection characteristics can be obtained by forming the retardation layer as a λ/4 plate as described above.
The retardation layer may contain any appropriate material as long as the above characteristics are satisfied. Specifically, the retardation layer may be an extended film of a resin film or an alignment cured layer of a liquid crystal compound (hereinafter referred to as a liquid crystal alignment cured layer).
When the retardation layer is an extended film of a resin film, a polycarbonate-based resin or a polyester carbonate-based resin (hereinafter, sometimes simply referred to as a polycarbonate-based resin) is given as a typical example of a resin constituting the resin film. As the polycarbonate-based resin, any appropriate polycarbonate-based resin can be used as long as the desired moisture permeability can be obtained. For example, 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, and a structural unit derived from at least 1 dihydroxy compound selected from the group consisting of alicyclic diol, alicyclic dimethanol, diethylene glycol, triethylene glycol, or polyethylene glycol, and alkylene glycol or spiroglycol. Preferably, the polycarbonate-series resin contains a structural unit derived from a fluorene-series dihydroxy compound, a structural unit derived from an isosorbide-series dihydroxy compound, a structural unit derived from alicyclic dimethanol, and/or a structural unit derived from diethylene glycol, triethylene glycol, or polyethylene glycol; more preferably, the polycarbonate-series resin contains a structural unit derived from a fluorene-series dihydroxy compound, a structural unit derived from an isosorbide-series dihydroxy compound, and a structural unit derived from diethylene glycol, triethylene glycol, or polyethylene glycol. The polycarbonate-based resin may contain a structural unit derived from another dihydroxy compound, if necessary. The retardation layer can be formed by stretching the film made of the polycarbonate resin as described above under any suitable stretching conditions. Further, details of the polycarbonate-based resin and the method of forming the retardation layer are described in, for example, Japanese patent laid-open Nos. 2014-10291, 2014-26266, 2015-212816, 2015-212817, 2015-212818, 2017-54093 and 2018-60014. The descriptions of these publications are incorporated herein by reference.
When the retardation layer is a liquid crystal alignment cured layer, the difference between nx and ny of the resulting retardation layer can be made significantly larger than that of a non-liquid crystal material by using a liquid crystal compound, and therefore the thickness of the retardation layer for obtaining a desired in-plane retardation can be significantly reduced. As a result, the polarizing plate with a retardation layer (eventually, an organic EL display device) can be further thinned. In the present specification, the "alignment cured layer" is a layer in which a liquid crystal compound is aligned in a predetermined direction within the layer and the alignment state thereof is fixed. The term "alignment cured layer" includes an alignment cured layer obtained by curing a liquid crystal monomer. In this embodiment, a rod-like liquid crystal compound is typically aligned in the slow axis direction of the retardation layer (horizontal alignment). Specific examples of the liquid crystal compound and details of the method for forming the liquid crystal alignment cured layer are described in, for example, japanese patent laid-open nos. 2006-163343 and 2006-178389. The descriptions of these publications are incorporated herein by reference.
The thickness of the retardation layer is typically set to a thickness that can function properly as a λ/4 plate. When the retardation layer is an extended film of a resin film, the thickness of the retardation layer may be, for example, 10 to 60 μm. When the retardation layer is a liquid crystal alignment cured layer, the thickness of the retardation layer may be, for example, 1 μm to 5 μm.
When the retardation layer has a laminated structure, the retardation layer is typically a two-layer structure having a 1 st liquid crystal alignment cured layer and a 2 nd liquid crystal alignment cured layer. In this case, either one of the 1 st liquid crystal alignment cured layer and the 2 nd liquid crystal alignment cured layer can function as a λ/2 plate, and the other can function as a λ/4 plate. Here, a case where the 1 st liquid crystal alignment cured layer can function as a λ/2 plate and the 2 nd liquid crystal alignment cured layer can function as a λ/4 plate will be described, and the opposite is also possible. The thickness of the 1 st liquid crystal alignment cured layer may be adjusted to obtain an in-plane retardation required for a λ/2 plate, and may be, for example, 2.0 μm to 4.0 μm. The thickness of the 2 nd liquid crystal alignment cured layer may be adjusted to obtain an in-plane retardation required for a λ/4 plate, and may be, for example, 1.0 μm to 2.5 μm. The in-plane retardation Re (550) of the 1 st liquid crystal alignment cured layer is preferably 200nm to 300nm, more preferably 230nm to 290nm, and still more preferably 250nm to 280 nm. The in-plane retardation Re (550) of the 2 nd liquid crystal alignment cured layer is preferably 100nm to 190nm, more preferably 110nm to 170nm, and still more preferably 120nm to 160nm, as described above. The angle formed by the slow axis of the 1 st liquid crystal alignment cured layer and the absorption axis of the polarizer is preferably 10 ° to 20 °, more preferably 12 ° to 18 °, and still more preferably about 15 °. The angle formed by the slow axis of the 2 nd liquid crystal alignment cured layer and the absorption axis of the polarizer is preferably 70 ° to 80 °, more preferably 72 ° to 78 °, and still more preferably about 75 °. With such a configuration, a characteristic close to an ideal reverse wavelength dispersion characteristic can be obtained, and as a result, a very excellent antireflection characteristic can be realized.
D. Image display apparatus
The polarizing plate with a retardation layer described in the above items a to C can be suitably used for an organic EL display device. Therefore, embodiments of the present invention include an organic EL display device using such a polarizing plate with a retardation layer. An organic EL display device according to an embodiment of the present invention includes the polarizing plate with a retardation layer described in the above items a to C on the visible side. The polarizing plate with a retardation layer is laminated such that the retardation layer is on the organic EL cell side (such that the polarizing plate is on the visible side). In one embodiment, the organic EL display device has a curved shape (substantially a curved display screen) and/or can be curved or bent. As described above, the present inventors have found a new problem that ammonia (substantially ammonium ions) generated from an organic EL panel discolors a polarizing plate with a retardation layer when the polarizing plate with a retardation layer is applied to an organic EL display device, and have solved the problem by the polarizing plate with a retardation layer described in the above items a to C. That is, in the organic EL display device, the effect of the polarizing plate with a retardation layer according to the embodiment of the present invention is remarkable.
Examples
The present invention will be described in more detail with reference to the following examples, but the present invention is not limited to these examples. The measurement method of each property is as follows. In the examples and comparative examples, "parts" and "%" are by weight unless otherwise specifically indicated.
(1) Thickness of
The thickness of 10 μm or less was measured using a diffraction film thickness meter (manufactured by tsukamur electronics, product name "MCPD-3000"). The thickness exceeding 10 μm was measured by using a digital micrometer (manufactured by Riben Aishi Co., Ltd., product name "KC-351C").
(2) Transmittance and degree of polarization of monomer
The polarizing plates used in examples and comparative examples were made of a single transmittance Ts, a parallel transmittance Tp, and an orthogonal transmittance Tc measured using an ultraviolet-visible spectral luminance meter ("LPF-2000" manufactured by tsukamur electronics corporation), as polarizer Ts, Tp, and Tc, respectively. These Ts, Tp and Tc are Y values obtained by correcting the visual sensitivity by measuring the 2-degree visual field (C light source) according to JIS Z8701. From the Tp and Tc thus obtained, the degree of polarization P is determined by the following equation.
Polarization degree P (%) { (Tp-Tc)/(Tp + Tc) }1/2×100
(3) Moisture permeability
Measured according to JIS Z0208. Specifically, the protective layer or retardation layer (constituting film) used in examples and comparative examples was cut into a circle of 10cm Φ to obtain a measurement sample. The moisture permeability of the measurement sample was measured under test conditions of 40 ℃ and 92% RH (relative humidity) using "MOCON" manufactured by Hitachi, Ltd.
(4) Ammonia decolorization test
10g of a 10% aqueous ammonia solution was placed in a glass bottle (cylindrical shape having a diameter of 30mm and a depth of 50 mm). At this time, the distance from the liquid surface 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 to have a size of 15mm × 15mm, and an adhesive layer was provided on the retardation layer side as a measurement sample. The measurement sample was adhered to the edge of the mouth of the glass bottle via the adhesive layer so as to cover the entire mouth of the glass bottle with the measurement sample and prevent the steam from leaking from the gap. The glass bottle covered with the sample to be measured was heated at 60 ℃ for 2 hours. The degree of polarization of the polarizing plate with a retardation layer (substantially a polarizer) before heating was P0, and the degree of polarization after heating was P20, and Δ P was calculated from the following equation. A smaller Δ P means that the discoloration by ammonia is more suppressed.
ΔP＝P20-P0
[ example 1]
1. Production of polarizer
As the thermoplastic resin substrate, an amorphous isophthalic acid copolymerized polyethylene terephthalate film (thickness: 100 μm) having a water absorption of 0.75% and a Tg of about 75 ℃ in a long form was used. One side of the resin substrate was subjected to corona treatment.
The direction of the reaction is 9: 1A PVA-based resin (PVA-based resin) comprising polyvinyl alcohol (having a polymerization degree of 4200 and a saponification degree of 99.2 mol%) and acetoacetyl-modified PVA (trade name "GOHSEFIMER Z410" manufactured by Nippon synthetic chemical industries, Ltd.) was mixed with 13 parts by weight of potassium iodide, and the resulting mixture was dissolved in water to prepare an aqueous PVA solution (coating solution).
The corona-treated surface of the resin substrate was coated with the aqueous PVA solution and dried at 60 ℃ to form a PVA-based resin layer having a thickness of 13 μm, thereby producing a laminate.
The resultant laminate was uniaxially stretched 2.4 times at the free end in the longitudinal direction (longitudinal direction) between rolls having different peripheral speeds in an oven at 130 ℃ (in-air auxiliary stretching treatment).
Next, the laminate was immersed in an insolubilization bath (an aqueous boric acid solution prepared by mixing 4 parts by weight of boric acid with 100 parts by weight of water) at a liquid temperature of 40 ℃ for 30 seconds (insolubilization treatment).
Next, the polarizing film was immersed in a dyeing bath (aqueous iodine solution prepared by mixing iodine and potassium iodide at a weight ratio of 1: 7 with respect to 100 parts by weight of water) at a liquid temperature of 30 ℃ for 60 seconds while adjusting the concentration so that the monomer transmittance (Ts) of the finally obtained polarizing film was 43.0% (dyeing treatment).
Subsequently, the resultant was immersed in a crosslinking bath (an aqueous boric acid solution prepared by mixing 3 parts by weight of potassium iodide and 5 parts by weight of boric acid with respect to 100 parts by weight of water) at a liquid temperature of 40 ℃ for 30 seconds (crosslinking treatment).
Thereafter, the laminate was uniaxially stretched in the longitudinal direction (longitudinal direction) between rolls having different peripheral speeds so that the total draw ratio was 5.5 times, while being immersed in an aqueous boric acid solution (boric acid concentration: 4.0 wt%, potassium iodide: 5.0 wt%) having a liquid temperature of 70 ℃.
Thereafter, the laminate was immersed in a washing bath (aqueous solution prepared by mixing 4 parts by weight of potassium iodide with 100 parts by weight of water) at a liquid temperature of 20 ℃.
Thereafter, the sheet was dried in an oven maintained at 90 ℃ and was brought into contact with a heated roll made of SUS (Steel Use Stainless, Japan Stainless Steel) having a surface temperature maintained at 75 ℃ for about 2 seconds (drying shrinkage treatment). The shrinkage in the width direction of the laminate obtained by the drying shrinkage treatment was 5.2%.
Thus, a polarizer having a thickness of 5 μm was formed on the resin substrate.
2. Preparation of polarizing plate
An HC-TAC film was bonded to the polarizer surface of the resin substrate/polarizer laminate obtained above via an ultraviolet-curable adhesive. Specifically, the curable adhesive was applied so that the thickness thereof became 1.0 μm, and was bonded using a roll mill. Thereafter, the HC-TAC film side is irradiated with UV (ultraviolet) light to cure the adhesive. The HC-TAC film was formed by forming a Hard Coat (HC) layer (thickness 7 μm) on a triacetyl cellulose (TAC) film (thickness 25 μm), and was laminated with the TAC film on the polarizer side. Subsequently, the resin substrate was peeled off, and a cycloolefin resin film (COP film, 13 μm thick) was laminated on the peeled surface in the same manner as described above. The HC-TAC film has a moisture permeability of 427g/m224h, moisture permeability of COP film 35g/m224 h. Thus, a polarizing plate having a configuration of a visible side protective layer (HC-TAC film)/polarizer/another protective layer (COP film) was obtained.
3. Production of retardation film constituting retardation layer
3-1 polymerization of polyester carbonate-based resin
The polymerization was carried out using a batch polymerization apparatus comprising 2 vertical reactors each equipped with a stirring blade and a reflux cooler controlled to 100 ℃. Adding bis [9- (2-phenoxycarbonylethyl) fluoren-9-yl]29.60 parts by mass (0.046mol) of methane, 29.21 parts by mass (0.200mol) of Isosorbide (ISB), 42.28 parts by mass (0.139mol) of Spiroglycol (SPG), 63.77 parts by mass (0.298mol) of diphenyl carbonate (DPC), and 1.19 × 10 parts by mass of calcium acetate monohydrate as a catalyst-2Mass portion (6.78X 10)-5mol). After the inside of the reactor was replaced with nitrogen under reduced pressure, the reactor was heated with a heat medium, and stirring was started at a point when the inside temperature became 100 ℃. After the temperature rise was started for 40 minutes, the internal temperature was brought to 220 ℃,while the temperature was maintained, the pressure reduction was started to 220 ℃ and the pressure was increased to 13.3kPa for 90 minutes. Phenol vapor produced as a by-product of the polymerization reaction was introduced into a reflux cooler at 100 ℃, some of the monomer components contained in the phenol vapor were returned to the reactor, and the phenol vapor that had not condensed was introduced into a condenser at 45 ℃ and recovered. Nitrogen was introduced into the 1 st reactor and once the atmospheric pressure was returned, the oligomerization reaction liquid in the 1 st reactor was transferred to the 2 nd reactor. Subsequently, the temperature and pressure in the 2 nd reactor were increased to 240 ℃ over 50 minutes, and the internal temperature and pressure were 0.2 kPa. Then, the mixture was polymerized until a predetermined stirring power was reached. At the time point when the prescribed power is reached, nitrogen is introduced into the reactor to carry out repressurization, the resulting polyester carbonate-based resin is extruded into water, and the strand is cut to obtain pellets.
3-2. preparation of retardation film
After the obtained polyester carbonate resin (pellets) was vacuum-dried at 80 ℃ for 5 hours, a long resin film having a thickness of 135 μm was produced using a film-forming apparatus equipped with a uniaxial extruder (manufactured by Toshiba machine Co., Ltd., cylinder set temperature: 250 ℃), a T-die (width 200mm, set temperature: 250 ℃), a cooling roll (set temperature: 120 to 130 ℃) and a winder. The obtained long resin film was stretched at a stretching temperature of 133 ℃ in the width direction at a stretching ratio of 2.8 times to obtain a retardation film having a thickness of 47 μm. The obtained retardation film had Re (550) of 141nm, Re (450)/Re (550) of 0.82, and an Nz coefficient of 1.12. Further, the obtained retardation film had a moisture permeability of 75g/m2·24h。
4. Production of polarizing plate with retardation layer
The retardation film obtained in the above 3 was bonded to the surface of the other protective layer (COP film) of the polarizing plate obtained in the above 2 via an acrylic adhesive (thickness 5 μm). In this case, the polarizer and the retardation film were bonded so that the absorption axis of the polarizer and the slow axis of the retardation film form an angle of 45 °. In this manner, a polarizing plate with a retardation layer having a configuration of a visible side protective layer (HC-TAC film)/polarizer/another protective layer (COP film)/adhesive layer/retardation layer was obtained. The total thickness of the obtained polarizing plate with a retardation layer was 112 μm. Further, the obtained polarizing plate with a retardation layer was subjected to the evaluation in the above (4). The results are shown in Table 1.
[ example 2]
1. Preparation of polarizing plate
A polarizing plate was produced in the same manner as in example 1.
2. Production of liquid Crystal alignment cured layer constituting phase Difference 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) were added to 400 parts of Cyclopentanone (CPN), the mixture was heated to 60 ℃ and stirred to dissolve the compound, and after the dissolution was confirmed, the mixture was returned to room temperature, 3 parts of Irgacure907 (manufactured by BASF Japan Co., Ltd.), 0.2 part of MEGAFAC F-554 (manufactured by DIC Co., Ltd.) and 0.1 part of p-Methoxyphenol (MEHQ) were added thereto and stirred to obtain a solution. The solution was clear and homogeneous. The obtained solution was filtered through a 0.20 μm membrane filter to obtain a polymerizable composition. On the other hand, a polyimide solution for an alignment film was applied to a glass substrate having a thickness of 0.7mm by a spin coating method, dried at 100 ℃ for 10 minutes, and then fired at 200 ℃ for 60 minutes, thereby obtaining a coating film. The obtained coating film was subjected to rubbing treatment to form an alignment film. The rubbing treatment was carried out using a commercially available rubbing device. The polymerizable composition obtained above was applied to a substrate (substantially an alignment film) by a spin coating method, and dried at 100 ℃ for 2 minutes. The obtained coating film was cooled to room temperature, and then, using a high-pressure mercury lamp or the like, at 30mW/cm2The intensity of (2) was irradiated with ultraviolet rays for 30 seconds to obtain a liquid crystal alignment cured layer. The in-plane retardation Re (550) of the liquid crystal alignment cured layer was 130 nm. Further, the Re (450)/Re (550) of the liquid crystal alignment cured layer was 0.851, and reverse wavelength dispersion characteristics were exhibited.
3. Production of polarizing plate with retardation layer
The liquid crystal alignment cured layer obtained in the above 2 was transferred onto the surface of the other protective layer (COP film) of the polarizing plate obtained in the above 1. At this time, the transfer (bonding) was performed so that the angle formed by the absorption axis of the polarizer and the slow axis of the liquid crystal alignment cured layer became 45 °. Further, transfer (lamination) was performed via an ultraviolet-curable adhesive (thickness 1.0 μm). In this manner, a polarizing plate with a retardation layer having a configuration of a visible side protective layer (HC-TAC film)/polarizer/another protective layer (COP film)/adhesive layer/retardation layer (liquid crystal alignment cured layer) was obtained. 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 3]
A polarizing plate with a retardation layer was obtained in the same manner as in example 1, except that no other protective layer was 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.
[ examples 4 to 6]
The visible side protective layer, polarizer, another protective layer, and retardation layer were configured as shown in table 1, and a polarizing plate with a retardation layer was obtained. 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.
Comparative example 1
A resin substrate/polarizer laminate was produced in the same manner as in example 1. An HC-COP film was bonded to the polarizer surface of the obtained resin substrate/polarizer laminate in the same manner as in example 1. The HC-COP film was a film in which a Hard Coat (HC) layer (thickness 2 μm) was formed on a COP film (thickness 25 μm), and was laminated so that the COP film became the polarizer side. Next, the resin substrate was peeled off, and the same COP film as in example 1 was laminated on the peeled surface in the same manner as in example 1. The HC-COP film had a moisture permeability of 17g/m224h, moisture permeability of COP film 35g/m224 h. In this manner, a polarizing plate having a configuration of a visible side protective layer (HC-COP film)/polarizer/another protective layer (COP film) was obtained. The procedure of the subsequent steps 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.
[ comparative examples 2 to 10]
The visible side protective layer, polarizer, another protective layer, and retardation layer were configured as shown in table 1, and a polarizing plate with a retardation layer was obtained. 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.
TABLE 1
[ evaluation ]
As is clear from table 1, according to the examples of the present invention, a polarizing plate with a retardation layer in which the degree of polarization was not substantially changed (i.e., not discolored) was obtained even when exposed to ammonia. That is, according to the embodiments of the present invention, a polarizing plate with a retardation layer in which discoloration is suppressed when applied to an organic EL display device can be realized. On the other hand, the polarizing function of the polarizing plate with a retardation layer of the comparative example was greatly reduced, and half or more of the polarizing function was almost lost.
Industrial applicability
The polarizing plate with a retardation layer of the present invention is suitably used as an antireflection circular polarizing plate for an organic EL display device.
Description of the symbols
10 polarizing plate
11 polarizer
12 protective layer
13 protective layer
20 phase difference layer
100 polarizing plate with phase difference layer
Claims (10)
1. A polarizing plate with a retardation layer, comprising: a polarizing plate including a polarizer and a protective layer at least on a visible side of the polarizer, and a retardation layer disposed on an opposite side of the polarizing plate from the visible side,
the moisture permeability of the protective layer on the visible side is 200g/m224h or more and greater than the moisture permeability of the retardation layer.
2. The polarizing plate with a retardation layer according to claim 1, wherein the polarizing plate comprises a protective layer only on the visible side.
3. The polarizing plate with retardation layer according to claim 1 or 2, wherein the difference between the moisture permeability of the protective layer on the visible side and the moisture permeability of the retardation layer is 200g/m224h or more.
4. The polarizing plate with a phase difference layer according to claim 1, further comprising another protective layer on the opposite side of the visible side of the polarizer,
the moisture permeability of the protective layer on the visible side is greater than the lesser of the moisture permeability of the other protective layer and the moisture permeability of the retardation layer.
5. The polarizing plate with a retardation layer according to claim 4, wherein the retardation layer is an alignment cured 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.
6. The retardation-layer-equipped polarizing plate according to claim 4 or 5, wherein the difference between the moisture permeability of the visible-side protective layer and the smaller moisture permeability of the other protective layer and the moisture permeability of the retardation layer is 200g/m224h or more.
7. The polarizing plate with a retardation layer according to any one of claims 3 to 6, wherein the other protective layer has a moisture permeability of 150g/m224h or less.
8. The polarizing plate with a retardation layer according to any one of claims 1 to 7, wherein the polarizer has a thickness of 8 μm or less.
9. The polarizing plate with a retardation layer according to any one of claims 1 to 8, which has a total thickness of 20 to 100 μm.
10. An organic electroluminescent display device comprising the polarizing plate with retardation layer according to any one of claims 1 to 9.
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2019-186856 | 2019-10-10 | ||
| JP2019186856 | 2019-10-10 | ||
| JP2020-087156 | 2020-05-19 | ||
| JP2020087156A JP2021063975A (en) | 2019-10-10 | 2020-05-19 | Polarizing plate with retardation layer and organic electroluminescence display device using the same |
| PCT/JP2020/030573 WO2021070467A1 (en) | 2019-10-10 | 2020-08-11 | Phase difference layer-attached polarization plate and organic electro luminescence display device using same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114502998A true CN114502998A (en) | 2022-05-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202080070457.3A Pending CN114502998A (en) | 2019-10-10 | 2020-08-11 | Polarizing plate with retardation layer and organic electroluminescent display device using the same |
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| Country | Link |
|---|---|
| KR (1) | KR20220076468A (en) |
| CN (1) | CN114502998A (en) |
| WO (1) | WO2021070467A1 (en) |
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| JP2022081990A (en) * | 2020-11-20 | 2022-06-01 | 日東電工株式会社 | Retardation layer attached polarizing plate and organic electroluminescent display device using the same |
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|---|---|---|---|---|
| CN1906510A (en) * | 2004-03-25 | 2007-01-31 | 日东电工株式会社 | Manufacturing method for polarizing plate, polarizing plate and picture display device using the polarizing plate |
| CN104871079A (en) * | 2013-10-31 | 2015-08-26 | 日东电工株式会社 | Liquid crystal panel and polarizer laminate used in said liquid crystal panel |
| CN108292005A (en) * | 2015-12-10 | 2018-07-17 | 日东电工株式会社 | Circular polarizing disk and the flexible image display device for having used it |
| WO2019123947A1 (en) * | 2017-12-19 | 2019-06-27 | 日東電工株式会社 | Phase difference film, polarizer with optical compensation layer, image display device, and image display device with touch panel |
| JP2019148734A (en) * | 2018-02-28 | 2019-09-05 | 住友化学株式会社 | Circularly polarizing plate |
| CN110709740A (en) * | 2017-06-09 | 2020-01-17 | 日东电工株式会社 | Polarizing plate with phase difference layer and image display device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| EP1045261B1 (en) | 1998-10-30 | 2005-02-02 | Teijin Limited | Phase difference film and optical device using it |
| JP2002372622A (en) | 2001-06-14 | 2002-12-26 | Nitto Denko Corp | Composite optical retardation plate, circularly polarizing plate and liquid crystal display, organic el display device |
| JP2003311239A (en) | 2002-04-23 | 2003-11-05 | Matsushita Electric Works Ltd | Apparatus for treating garbage |
| JP2005338736A (en) * | 2004-05-31 | 2005-12-08 | Fuji Photo Film Co Ltd | Polarizer plate, optical compensation film incorporating polarizer plate, liquid crystal display and light emitting display device |
| JP7072970B2 (en) * | 2017-12-19 | 2022-05-23 | 日東電工株式会社 | Phase difference plate, polarizing plate with optical compensation layer, image display device, and image display device with touch panel |
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2020
- 2020-08-11 KR KR1020227011468A patent/KR20220076468A/en unknown
- 2020-08-11 WO PCT/JP2020/030573 patent/WO2021070467A1/en active Application Filing
- 2020-08-11 CN CN202080070457.3A patent/CN114502998A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1906510A (en) * | 2004-03-25 | 2007-01-31 | 日东电工株式会社 | Manufacturing method for polarizing plate, polarizing plate and picture display device using the polarizing plate |
| CN104871079A (en) * | 2013-10-31 | 2015-08-26 | 日东电工株式会社 | Liquid crystal panel and polarizer laminate used in said liquid crystal panel |
| CN108292005A (en) * | 2015-12-10 | 2018-07-17 | 日东电工株式会社 | Circular polarizing disk and the flexible image display device for having used it |
| CN110709740A (en) * | 2017-06-09 | 2020-01-17 | 日东电工株式会社 | Polarizing plate with phase difference layer and image display device |
| WO2019123947A1 (en) * | 2017-12-19 | 2019-06-27 | 日東電工株式会社 | Phase difference film, polarizer with optical compensation layer, image display device, and image display device with touch panel |
| JP2019148734A (en) * | 2018-02-28 | 2019-09-05 | 住友化学株式会社 | Circularly polarizing plate |
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| WO2021070467A1 (en) | 2021-04-15 |
| KR20220076468A (en) | 2022-06-08 |
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