CN114578469A - Polarizing plate with optical compensation layer and organic EL panel using the same - Google Patents
Polarizing plate with optical compensation layer and organic EL panel using the same Download PDFInfo
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- CN114578469A CN114578469A CN202111048359.2A CN202111048359A CN114578469A CN 114578469 A CN114578469 A CN 114578469A CN 202111048359 A CN202111048359 A CN 202111048359A CN 114578469 A CN114578469 A CN 114578469A
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Classifications
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/80—Constructional details
- H10K50/86—Arrangements for improving contrast, e.g. preventing reflection of ambient light
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
- G02B5/3083—Birefringent or phase retarding elements
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
- G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
- G02B5/3033—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid
- G02B5/3041—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid comprising multiple thin layers, e.g. multilayer stacks
- G02B5/305—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid comprising multiple thin layers, e.g. multilayer stacks including organic materials, e.g. polymeric layers
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/80—Constructional details
- H10K50/85—Arrangements for extracting light from the devices
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/80—Constructional details
- H10K50/868—Arrangements for polarized light emission
-
- 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
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- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- General Physics & Mathematics (AREA)
- Polarising Elements (AREA)
- Electroluminescent Light Sources (AREA)
Abstract
The invention provides a polarizing plate with an optical compensation layer, which has excellent anti-reflection characteristics in an oblique direction while maintaining excellent anti-reflection characteristics in a front direction, and has a neutral hue in the oblique direction. The polarizing plate with an optical compensation layer of the present invention is used for an organic EL panel. The polarizing plate with the optical compensation layer is provided with a polarizer, a first optical compensation layer and a second optical compensation layer in sequence. The first optical compensation layer exhibits a refractive index characteristic of nx > nz > ny, and Re (550) is 220nm to 300 nm. The second optical compensation layer exhibits a refractive index characteristic of nx > nz > ny, and Re (550) is from 90nm to 170 nm. Re (450) and Re (550) of the first optical compensation layer and the second optical compensation layer are substantially equal.
Description
Technical Field
The present invention relates to a polarizing plate with an optical compensation layer and an organic EL panel using the same.
Background
In recent years, along with the spread of thin displays, displays (organic EL display devices) having organic EL panels mounted thereon have been proposed. Since the organic EL panel has a metal layer having high reflectivity, problems such as reflection of ambient light and reflection of a background tend to occur. Therefore, it is known to prevent these problems by providing a circularly polarizing plate on the visual confirmation side. As a general circularly polarizing plate, there is known a circularly polarizing plate obtained by laminating a retardation film (typically, a λ/4 plate) so that the slow axis thereof forms an angle of about 45 ° with respect to the absorption axis of a polarizer. In addition, in order to further improve the antireflection characteristic, it has been attempted to laminate a retardation film (optical compensation layer) having various optical characteristics. As the retardation film, for example, a retardation film satisfying Re (550) > Re (450) is known. A circularly polarizing plate using such a retardation film is expected to improve the viewing angle characteristics of an organic EL panel. However, such a retardation film is expensive and the production cost of the circularly polarizing plate is high.
Documents of the prior art
Patent document
Patent document 1: japanese patent No. 3325560
Disclosure of Invention
Problems to be solved by the invention
The present invention has been made to solve the above conventional problems, and has as its main object: provided is a polarizing plate with an optical compensation layer, which is inexpensive, has excellent anti-reflection properties in an oblique direction while maintaining excellent anti-reflection properties in a front direction, and can realize an organic EL panel having a neutral hue in an oblique direction.
Means for solving the problems
The polarizing plate with an optical compensation layer of the present invention can be used for an organic EL panel. The polarizing plate with the optical compensation layer is provided with a polarizer, a first optical compensation layer and a second optical compensation layer in sequence. The first optical compensation layer and the second optical compensation layer respectively show refractive index characteristics of nx > nz > ny. Further, Re (450) and Re (550) of the first optical compensation layer and the second optical compensation layer are substantially equal. In one embodiment, Re (550) is 220nm to 300nm, the Nz coefficient is 0.4 to 0.8, and the angle formed by the absorption axis direction of the polarizer and the slow axis direction of the first optical compensation layer is 5 to 25 degrees. In addition, the Re (550) of the second optical compensation layer is 90 nm-170 nm, the Nz coefficient is 0.4-0.8, and the angle formed by the absorption axis direction of the polarizer and the slow axis direction of the second optical compensation layer is 65-85 degrees. Here, Re (450) and Re (550) represent in-plane retardation measured with light having a wavelength of 450nm and 550nm, respectively, at 23 ℃.
In one embodiment, the first optical compensation layer has a Re (550) of 280nm to 360nm, an Nz coefficient of 0.5 to 0.9, and an angle formed by an absorption axis direction of the polarizer and a slow axis direction of the first optical compensation layer is substantially parallel. The second optical compensation layer has Re (550) of 100 to 180nm, an Nz coefficient of 0.2 to 0.6, and an angle formed by the absorption axis direction of the polarizer and the slow axis direction of the second optical compensation layer is 35 to 55 degrees.
According to other aspects of the present invention, an organic EL panel is provided. The organic EL panel includes the above-described polarizing plate with an optical compensation layer.
Effects of the invention
According to the present invention, in a polarizing plate with an optical compensation layer, a first optical compensation layer and a second optical compensation layer are arranged in this order from the polarizer side, the first optical compensation layer exhibiting a refractive index characteristic of nx > nz > ny and having a predetermined in-plane retardation, the second optical compensation layer exhibiting a refractive index characteristic of nx > nz > ny and having a predetermined in-plane retardation, and the first optical compensation layer and the second optical compensation layer are both constituted by a retardation film having a flat dispersion, whereby a polarizing plate with an optical compensation layer of an organic EL panel can be obtained which is inexpensive, has excellent anti-reflection characteristics in an oblique direction while maintaining excellent anti-reflection characteristics in a front direction, and further can realize a color tone in an oblique direction that is neutral.
Drawings
Fig. 1 is a schematic cross-sectional view of a polarizing plate with an optical compensation layer according to an embodiment of the present invention.
Description of the symbols
10 polarizer
20 protective layer
30 first optical compensation layer
40 second optical compensation layer
100 polarizing plate with optical compensation layer
Detailed Description
Preferred embodiments of the present invention will be described below, but the present invention is not limited to these embodiments.
(definitions of terms 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., slow axis direction), "ny" is a refractive index in a direction orthogonal to the slow axis in the plane (i.e., 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 with respect to light having a wavelength of (. lamda.nm) at 23 ℃. Re (λ) is represented by the formula when the thickness of the layer (film) is set to d (nm): re ═ x-ny) × d. For example, "Re (550)" is an in-plane retardation measured with respect to light having a wavelength of 550nm at 23 ℃.
(3) Retardation in thickness direction (Rth)
"Rth (λ)" is a retardation in the thickness direction measured with respect to light having a wavelength of λ nm at 23 ℃. Rth (λ) is represented by the formula when the thickness of the layer (film) is set to d (nm): and Rth ═ x-nz) × d. For example, "Rth (550)" is a phase difference in the thickness direction measured with respect to light having a wavelength of 550nm at 23 ℃.
(4) Coefficient of Nz
The Nz coefficient is obtained from Nz ═ Rth/Re.
(5) Substantially orthogonal or parallel
The expressions "substantially orthogonal" and "substantially orthogonal" include the case where the angle formed by the two directions is 90 ° ± 10 °, preferably 90 ° ± 7 °, and more preferably 90 ° ± 5 °. The expressions "substantially parallel" and "substantially parallel" include the case where the angle formed by the two directions is 0 ° ± 10 °, preferably 0 ° ± 7 °, and more preferably 0 ° ± 5 °. In addition, in the present specification, when "orthogonal" or "parallel" is referred to, a substantially orthogonal or substantially parallel state may be included.
A. Integral construction of polarizer with optical compensation layer
Fig. 1 is a schematic cross-sectional view of a polarizing plate with an optical compensation layer according to an embodiment of the present invention. The polarizing plate with an optical compensation layer 100 of the present embodiment includes a polarizer 10, a first optical compensation layer 30, and a second optical compensation layer 40 in this order. Practically speaking, the protective layer 20 may be provided on the opposite side of the polarizer 10 from the first optical compensation layer 30 as in the example. The polarizing plate with an optical compensation layer may further include another protective layer (also referred to as an inner protective layer) between the polarizer 10 and the first optical compensation layer 30. In the illustrated example, the inner protective layer is omitted. In this case, the first optical compensation layer 30 can also function as an inner protective layer. If necessary, a conductive layer and a base material (both not shown) may be provided in this order on the opposite side of the second optical compensation layer 40 from the first optical compensation layer 30 (i.e., outside the second optical compensation layer 40). The substrate and the conductive layer are laminated in close contact. In the present specification, "closely laminated" means that two layers are directly and fixedly laminated without an adhesive layer (e.g., an adhesive layer, a pressure-sensitive adhesive layer) interposed therebetween. The conductive layer and the substrate are typically introduced into the polarizing plate 100 with an optical compensation layer in the form of a laminate of the substrate and the conductive layer. By further providing a conductive layer and a base material, the polarizing plate 100 with an optical compensation layer can be applied to an internal touch panel type input display device. Further, if necessary, the polarizing plate with an optical compensation layer (substantially, the protective layer 20) may be subjected to a treatment for improving the visibility when the viewing is performed through the polarized sunglasses (typically, imparting a (elliptical) circularly polarized light function and imparting an ultrahigh retardation). By performing such processing, even when the display screen is visually confirmed through a polarized lens such as a polarized sunglass, excellent visual confirmation can be achieved. Therefore, the polarizing plate with an optical compensation layer can be applied to an image display device that can be used outdoors.
The refractive index characteristics of each of the first optical compensation layer 30 and the second optical compensation layer 40 show the relationship of nx > nz > ny and have a slow axis. Further, Re (450) and Re (550) of the first optical compensation layer and the second optical compensation layer are substantially equal. That is, each of the first optical compensation layer and the second optical compensation layer has a flat dispersion characteristic in which a phase difference value hardly changes with a change in the wavelength of the measurement light. In one embodiment, the in-plane retardation Re (550) of the first optical compensation layer 30 is 220nm to 300 nm. In this case, the Nz coefficient of the first optical compensation layer is 0.4 to 0.8, and the angle formed by the slow axis of the first optical compensation layer 30 and the absorption axis of the polarizer 10 is 5 ° to 25 °, preferably 8 ° to 22 °, more preferably 12 ° to 18 °, and still more preferably about 15 °.
Further, the in-plane retardation Re (550) of the second optical compensation layer 40 is 90nm to 170 nm. In this case, the Nz coefficient of the second optical compensation layer is 0.4 to 0.8, and the angle formed by the slow axis of the second optical compensation layer 30 and the absorption axis of the polarizer 10 is 65 ° to 85 °, preferably 68 ° to 82 °, more preferably 72 ° to 78 °, and still more preferably about 75 °. In another embodiment, the in-plane retardation Re (550) of the first optical compensation layer 30 is preferably 280nm to 360 nm. In this case, the Nz coefficient of the first optical compensation layer is preferably 0.5 to 0.9, and the angle formed by the slow axis of the first optical compensation layer 30 and the absorption axis of the polarizer 10 is preferably substantially parallel. The in-plane retardation Re (550) of the second optical compensation layer 40 is preferably 100nm to 180 nm. In this case, the Nz coefficient of the second optical compensation layer is preferably 0.2 to 0.6, and the angle formed by the slow axis of the second optical compensation layer 30 and the absorption axis of the polarizer 10 is preferably 35 ° to 55 °, more preferably 38 ° to 52 °, further preferably 42 ° to 48 °, and particularly preferably about 45 °. As described above, by arranging the first optical compensation layer exhibiting the refractive index characteristic of nx > nz > ny and having a predetermined in-plane retardation and the second optical compensation layer exhibiting the refractive index characteristic of nx > nz > ny and having a predetermined in-plane retardation in this order from the polarizer side and configuring both the first optical compensation layer and the second optical compensation layer with a flat dispersion retardation film, it is possible to maintain excellent antireflection characteristics in the front direction due to an excellent circularly polarized light function and prevent light leakage and the like due to apparent axial shift of the absorption axis of the polarizer when viewed from the oblique direction. As a result, when the polarizing plate with an optical compensation layer is applied to an organic EL panel, excellent antireflection characteristics can be achieved in an oblique direction, and a neutral (i.e., no undesirable coloration) hue can be achieved in an oblique direction.
Hereinafter, each layer constituting the polarizing plate with an optical compensation layer and the optical film will be described in detail.
A-1 polarizer
As the polarizer 10, any suitable polarizer can be used. 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: a polarizer obtained by subjecting a hydrophilic polymer film such as a polyvinyl alcohol (PVA) film, a partially formalized PVA film, or an ethylene-vinyl acetate copolymer partially saponified film to a dyeing treatment or a stretching treatment with a dichroic substance such as iodine or a dichroic dye, a polyene-based oriented film such as a PVA dehydrated product, or a polyvinyl chloride desalted product, and the like. From the viewpoint of excellent optical properties, it is preferable to use a polarizer obtained by uniaxially stretching a PVA-based film dyed with iodine.
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 preferably 3 to 7 times. The stretching may be performed after the dyeing treatment, or may be performed while dyeing. In addition, dyeing may be performed after stretching. The PVA-based 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 and antiblocking agents on the surface of the PVA-based film can be washed off, but also the PVA-based film can be swollen to prevent uneven dyeing and the like.
Specific examples of the polarizer obtained by using the laminate include: the polarizer is obtained by using a laminate of a resin substrate and a PVA type resin layer (PVA type resin film) laminated on the resin substrate or a laminate of a resin substrate and a PVA type resin layer formed on the resin substrate by coating. A polarizer obtained by using a laminate of a resin substrate and a PVA-based resin layer formed on the resin substrate by coating can be produced, for example, as follows: coating a PVA-based resin solution on a resin base material and drying the PVA-based resin solution 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 form a polarizer from the PVA resin layer. In the present embodiment, the stretching typically includes immersing the laminate in an aqueous boric acid solution to perform stretching. Further, the stretching may further include subjecting the laminate to in-air stretching at a high temperature (for example, 95 ℃ or higher) before stretching in the aqueous boric acid solution, if necessary. 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 corresponding to the purpose may be laminated on the peeled surface. The details of the method for producing such a polarizer are described in, for example, japanese patent laid-open No. 2012 and 73580 (japanese patent No. 5414738). The entire contents of the publication are incorporated herein by reference.
The thickness of the polarizer is preferably 25 μm or less, more preferably 1 to 12 μm, still more preferably 3 to 12 μm, and particularly preferably 3 to 8 μm. If the thickness of the polarizer is within such a range, the curling during heating can be favorably suppressed, and favorable durability of appearance during heating can be obtained.
The polarizer preferably exhibits absorption dichroism at any wavelength of 380nm to 780 nm. The monomer transmittance of the polarizer is preferably 42.0% to 46.0%, more 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 still more preferably 99.9% or more.
A-2. first optical compensation layer
As described above, with the first optical compensation layer 30, the refractive index characteristic shows the relationship of nx > nz > ny and has a slow axis. Further, the first optical compensation layer exhibits a flat wavelength dispersion characteristic in which the phase difference value hardly changes with a change in the wavelength of the measurement light. Specifically, Re (450)/Re (550) of the first optical compensation layer is preferably 0.99 to 1.03. Since a retardation film exhibiting flat wavelength dispersion characteristics is less expensive than a retardation film exhibiting reverse dispersion characteristics, a polarizing plate with an optical compensation layer can be obtained at low cost and having excellent optical characteristics by employing the configuration as in the embodiment of the present invention.
The in-plane retardation Re (550) of the first optical compensation layer 30 is 220nm to 300nm, preferably 230nm to 290nm, and more preferably 250nm to 270 nm. If the in-plane retardation of the first optical compensation layer is in such a range, the decrease in the antireflection function in the oblique direction due to the apparent axial shift of the absorption axis of the polarizer can be prevented by setting the slow axis direction of the first optical compensation layer to 5 ° to 25 ° (particularly, about 15 °) with respect to the absorption axis direction of the polarizer as described above. In this case, in one embodiment, the Nz coefficient of the first optical compensation layer is 0.4 to 0.8, preferably 0.5 to 0.7, more preferably 0.55 to 0.65, and particularly preferably 0.55 to 0.60. If the Nz coefficient is in such a range, more excellent antireflection characteristics in an oblique direction can be achieved by adjusting the angle between the slow axis of the first optical compensation layer and the absorption axis of the polarizer to a predetermined angle.
In another embodiment, the in-plane retardation Re (550) of the first optical compensation layer is preferably 280 to 360nm, more preferably 290 to 350nm, and still more preferably 310 to 330 nm. If the in-plane retardation of the first optical compensation layer is within such a range, it is possible to prevent a decrease in the antireflection function in the oblique direction due to the apparent axial shift of the absorption axis of the polarizer by setting the slow axis direction of the first optical compensation layer to be preferably substantially parallel to the absorption axis direction of the polarizer. In this case, in another embodiment, the Nz coefficient is preferably 0.5 to 0.9, more preferably 0.6 to 0.8, still more preferably 0.7 to 0.8, and particularly preferably 0.72 to 0.78. When the Nz coefficient is in such a range, more excellent antireflection characteristics in an oblique direction can be achieved by adjusting the angle between the slow axis of the first optical compensation layer and the absorption axis of the polarizer to a predetermined angle.
The first optical compensation layer is typically formed of a resin film formed of any suitable resin capable of achieving the above-described characteristics. Examples of the resin forming the resin film include: polycarbonate-based resin, cycloolefin-based resin, cellulose-based resin, polyester-based resin, polyvinyl alcohol-based resin, polyamide-based resin, polyimide-based resin, polyether-based resin, polystyrene-based resin, acrylic resin, and polyester carbonate resin. Among these, a cycloolefin-based resin or a polycarbonate-based resin can be suitably used.
The cycloolefin-based resin is a general term for a resin obtained by polymerizing a cycloolefin as a polymerization unit, and examples thereof include those described in Japanese patent laid-open Nos. 1-240517, 3-14882 and 3-122137. Specific examples thereof include: ring-opened (copolymer) polymers of cyclic olefins, addition polymers of cyclic olefins, copolymers of cyclic olefins with α -olefins such as ethylene and propylene (typically random copolymers), graft-modified products obtained by modifying these with unsaturated carboxylic acids and derivatives thereof, and hydrogenated products thereof. Specific examples of the cyclic olefin include a norbornene-based monomer. Examples of the norbornene-based monomer include those described in Japanese patent laid-open publication No. 2015-210459 and the like. Various cycloolefin resins are commercially available. Specific examples thereof include: the product name "ZEONEX", "ZEONOR" manufactured by japan ZEON corporation, the product name "Arton" manufactured by JSR corporation, the product name "TOPAS" manufactured by TICONA corporation, and the product name "APEL" manufactured by mitsui chemical corporation.
As the polycarbonate-based resin, any suitable polycarbonate resin can be used as long as the effects of the present invention can be obtained. The polycarbonate resin preferably contains a structural unit derived from an isosorbide-based dihydroxy compound and a structural unit derived from at least one dihydroxy compound selected from the group consisting of alicyclic diols, alicyclic dimethanol, diethylene glycol, triethylene glycol, polyethylene glycol, and alkylene glycols or spiroglycol. More preferably, the polycarbonate resin contains a structural unit derived from an isosorbide-based dihydroxy compound, a structural unit derived from alicyclic dimethanol, and/or a structural unit derived from diethylene glycol, triethylene glycol, or polyethylene glycol. The polycarbonate resin may contain a structural unit derived from another dihydroxy compound as required. Further, details of a polycarbonate resin and a method for producing a retardation film which can be suitably used in the present invention are described in, for example, international publication No. 2011/062239, which is incorporated herein by reference.
The first optical compensation layer may be formed, for example, by: a coating liquid in which the resin is dissolved or dispersed in an arbitrary appropriate solvent is applied to a shrinkable film to form a coating film, and the coating film is shrunk. Typically, shrinkage of a coating film is achieved by heating a laminate of a shrinkable film and a coating film to shrink the shrinkable film, and shrinking the coating film by such shrinkage of the shrinkable film. The shrinkage of the coating film is preferably 0.50 to 0.99, more preferably 0.60 to 0.98, and still more preferably 0.70 to 0.95. The heating temperature is preferably 130 to 170 ℃ and more preferably 150 to 160 ℃. In one embodiment, when the coating film is shrunk, the laminate may be stretched in a direction orthogonal to the shrinking direction. In this case, the stretch ratio of the laminate is preferably 1.01 to 3.0 times, more preferably 1.05 to 2.0 times, and still more preferably 1.10 to 1.50 times. Specific examples of the material constituting the shrinkable film include: polyolefin, polyester, acrylic resin, polyamide, polycarbonate, norbornene resin, polystyrene, polyvinyl chloride, polyvinylidene chloride, cellulose resin, polyether sulfone, polysulfone, polyimide, polyacrylic acid, acetate resin, polyarylate, polyvinyl alcohol, liquid crystal polymer. They may be used alone or in combination. The shrinkable film is preferably a stretched film formed of these materials.
The thickness of the first optical compensation layer is preferably 10 μm to 200 μm, more preferably 20 μm to 150 μm, and still more preferably 20 μm to 60 μm. The desired in-plane retardation and Nz coefficient can be obtained by such a thickness.
A-3. second optical compensation layer
As described above, with the second optical compensation layer 40, the refractive index characteristic shows the relationship of nx > nz > ny and has a slow axis. Further, the first optical compensation layer exhibits a flat wavelength dispersion characteristic in which the phase difference value hardly changes with a change in the wavelength of the measurement light. Specifically, Re (450)/Re (550) of the first optical compensation layer is preferably 0.99 to 1.03. Since a retardation film exhibiting flat wavelength dispersion characteristics is less expensive than a retardation film exhibiting reverse dispersion characteristics, a polarizing plate with an optical compensation layer can be obtained at low cost and having excellent optical characteristics by employing the configuration as in the embodiment of the present invention.
As described above, the in-plane retardation Re (550) of the second optical compensation layer 40 is 90nm to 170nm, preferably 100nm to 160nm, and more preferably 120nm to 140 nm. When the in-plane retardation of the second optical compensation layer is in such a range, the slow axis direction of the second optical compensation layer is set so as to be at an angle of 65 ° to 85 ° (particularly, about 75 °) with respect to the absorption axis direction of the polarizer as described above, whereby excellent antireflection characteristics can be realized. In this case, in one embodiment, the second optical compensation layer has an Nz coefficient of 0.4 to 0.8, preferably 0.5 to 0.7, more preferably 0.55 to 0.65, and particularly preferably 0.57 to 0.63. More excellent reflected color can be achieved.
In another embodiment, as described above, the in-plane retardation Re (550) of the second optical compensation layer 40 is preferably 100nm to 180nm, more preferably 110nm to 170nm, and still more preferably 130nm to 150 nm. When the in-plane retardation of the second optical compensation layer is in such a range, the slow axis direction of the second optical compensation layer is set so as to be at an angle of preferably 35 ° to 55 ° (particularly preferably about 45 °) with respect to the absorption axis direction of the polarizer as described above, whereby excellent antireflection characteristics can be realized. In this case, the Nz coefficient is preferably 0.2 to 0.6, more preferably 0.3 to 0.5, still more preferably 0.35 to 0.45, and particularly preferably 0.37 to 0.42. A more excellent reflected color can be achieved.
The material for forming the second optical compensation layer and the forming method of the second optical compensation layer are the same as those of the first optical compensation layer.
The thickness of the second optical compensation layer is preferably 10 μm to 150 μm, more preferably 10 μm to 100 μm, and still more preferably 10 μm to 30 μm. The thickness of the film is set so that the desired in-plane retardation and Nz coefficient can be obtained,
by combining the first optical compensation layer described in the above a-2 with the second optical compensation layer described in the above a-3, a polarizing plate with an optical compensation layer can be obtained which is inexpensive, has excellent anti-reflection properties in an oblique direction while maintaining excellent anti-reflection properties in a front direction, and can realize an organic EL panel having a neutral hue in an oblique direction.
A-4 protective layer
The protective layer 20 is formed of any suitable film that can be used as a protective layer for a polarizer. Specific examples of the material that becomes the main component of the film include: cellulose resins such as cellulose Triacetate (TAC), polyester, polyvinyl alcohol, polycarbonate, polyamide, polyimide, polyether sulfone, polysulfone, polystyrene, polynorbornene, polyolefin, (meth) acrylic, and acetate transparent resins. In addition, there may be mentioned: and thermosetting resins such as (meth) acrylic, urethane, (meth) acrylic urethane, epoxy, and silicone resins, and ultraviolet-curable resins. In addition, for example, a glassy polymer such as a siloxane polymer can be cited. In addition, the polymer film described in Japanese patent application laid-open No. 2001-343529 (WO01/37007) can also be used. As a material of the film, for example, a resin composition containing a thermoplastic resin having a substituted or unsubstituted imide group in a side chain and a thermoplastic resin having a substituted or unsubstituted phenyl group and a nitrile group in a side chain can be used, and for example, a resin composition containing an alternating copolymer of isobutylene and N-methylmaleimide and an acrylonitrile-styrene copolymer can be cited. The polymer film may be, for example, an extrusion-molded product of the resin composition.
The protective layer 20 may be subjected to surface treatment such as hard coating treatment, antireflection treatment, anti-sticking treatment, and antiglare treatment as needed.
The thickness of the protective layer 20 is typically 5mm or less, preferably 1mm or less, more preferably 1 μm to 500 μm, and still more preferably 5 μm to 150 μm. In addition, when the surface treatment is performed, the thickness of the protective layer is a thickness including the thickness of the surface treatment layer.
In the case where an inner protective layer is provided between the polarizer 10 and the first optical compensation layer 30, the inner protective layer is preferably optically isotropic. In the present specification, "optically isotropic" means that the in-plane retardation Re (550) is 0nm to 10nm and the retardation Rth (550) in the thickness direction is-10 nm to +10 nm. The inner protective layer may be made of any appropriate material as long as it is optically isotropic. The material may be appropriately selected from the materials described above for the protective layer 20, for example.
The thickness of the inner protective layer is preferably 5 to 200. mu.m, more preferably 10 to 100. mu.m, and still more preferably 15 to 95 μm.
A-5. others
The respective layers constituting the polarizing plate with an optical compensation layer are bonded to each other with an arbitrary appropriate adhesive layer or adhesive layer interposed therebetween.
Although not shown, an adhesive layer may be provided on the second optical compensation layer 40 side of the polarizing plate 100 with an optical compensation layer. By providing an adhesive layer in advance, it is possible to easily bond the optical member to another optical member (for example, an organic EL panel). Further, a release film is preferably attached to the surface of the pressure-sensitive adhesive layer until use. By temporarily attaching the release film, the adhesive layer can be protected and formed into a roll.
B. Organic EL panel
An organic EL panel of the present invention includes an organic EL unit and the polarizing plate with an optical compensation layer described in the above item a provided on the visual confirmation side of the organic EL unit. The polarizing plate with the optical compensation layer is laminated such that the second optical compensation layer is on the organic EL cell side (such that the polarizer is on the visual confirmation side).
Examples
The present invention will be specifically described below with reference to examples, but the present invention is not limited to these examples. The measurement method of each characteristic is as follows.
(1) Thickness of
The measurement was performed using a dial gauge (product name "DG-205" manufactured by PEACOCK Co., Ltd.) and a dial gauge stand (product name "pds-2").
(2) Phase difference
Samples of 50mm × 50mm were cut out from the retardation films constituting the optical compensation layers of the polarizing plates with optical compensation layers of examples and comparative examples, and the measurement was performed using an Axoscan manufactured by Axometrics. The measurement wavelength was 450nm and 550nm, and the measurement temperature was 23 ℃.
The average refractive index was measured using an abbe refractometer manufactured by Atago, and the refractive indices nx, ny, nz were calculated from the obtained phase difference values.
(3) Front reflection brightness
The polarizing plates with the optical compensation layer obtained in examples and comparative examples were bonded to the visual confirmation side of the organic EL panel of the organic EL display device (LG display, product name "55C 7P") with the optical compensation layer on the organic EL side through an adhesive layer, and the organic EL display device was obtained.
The organic EL was caused to display a black image, and the front reflection luminance was measured using a spectrocolorimeter (product name "CM-2600D") manufactured by konica minolta corporation.
(4) Reflection characteristics in oblique directions
The characteristics of the polarizing plates with optical compensation layers obtained in examples and comparative examples were simulated. The oblique direction (polar angle 60 °) was evaluated. The simulation used "LCD MASTER Ver.6.084" manufactured by Shintech. The simulation of the reflection characteristic was performed using the extended function of the LCD Master.
[ example 1]
(i) Fabrication of first optical compensation layer
As the resin film, a commercially available cycloolefin resin film (product name "Arton (R5000)", manufactured by JSR corporation) was used. The thickness was 130 μm and the Tg was 137 ℃. A shrinkable film (product name "TORAYFAN BO 2873" manufactured by Toray corporation) having a thickness of 60 μm was laminated on both sides of the film via an acrylic pressure-sensitive adhesive layer (thickness: 15 μm) and subjected to uniaxial stretching at the free end to obtain a retardation film constituting a first optical compensation layer. The stretching temperature was set to 134 ℃ and the stretching magnification was set to 1.06 times. The obtained retardation film (i.e., the first optical compensation layer) had Re (550) of 257nm, an Nz coefficient of 0.59, and Re (450)/Re (550) of 1.00.
(ii) Fabrication of the second optical compensation layer
A retardation film constituting the second optical compensation layer was produced in the same manner as in (i) the production of the first optical compensation layer, except that the stretching temperature was set to 135 ℃ and the stretching magnification was set to 1.03 times. The obtained retardation film (i.e., the second optical compensation layer) had Re (550) of 130nm, an Nz coefficient of 0.6, and Re (450)/Re (550) of 1.00.
(iii) Production of polarizer
A polarizer having a thickness of 12 μm was obtained by subjecting a long roll of a polyvinyl alcohol (PVA) resin film (product name "PE 3000" manufactured by Toray corporation) having a thickness of 30 μm to swelling, dyeing, crosslinking, washing and drying treatments simultaneously while stretching the long roll in a lengthwise direction by a 5.9 times in one direction.
Specifically, the swelling treatment was carried out by stretching the mixture to 2.2 times while treating the mixture with pure water at 20 ℃. Next, in the dyeing treatment, while the monomer transmittance of the obtained polarizer was adjusted to 45.0%, the ratio of iodine to potassium iodide in terms of weight adjusted to iodine concentration was 1: 7 was stretched to 1.4 times while being treated in an aqueous solution at 30 ℃. Further, the crosslinking treatment was carried out in two stages, and in the first stage, the crosslinking treatment was carried out in an aqueous solution of boric acid and potassium iodide dissolved therein at 40 ℃ while stretching to 1.2 times. The boric acid content of the crosslinking-treated aqueous solution of the first stage was set to 5.0 wt%, and the potassium iodide content was set to 3.0 wt%. In the second stage of crosslinking treatment, the treatment was carried out at 65 ℃ in an aqueous solution containing boric acid and potassium iodide dissolved therein while stretching to 1.6 times. The boric acid content of the aqueous solution of the second stage of the crosslinking treatment was set to 4.3% by weight, and the potassium iodide content was set to 5.0% by weight. In addition, the washing treatment was carried out in an aqueous solution of potassium iodide at 20 ℃. The potassium iodide content of the aqueous solution of the cleaning treatment was set to 2.6 wt%. Finally, as for the drying treatment, drying was carried out at 70 ℃ for 5 minutes to obtain a polarizer.
(iv) Preparation of polarizing plate
An HC-TAC film (thickness: 32 μm, corresponding to the protective layer) having a Hard Coat (HC) layer (7 μm) formed on one surface of the TAC film (25 μm) by a hard coat treatment was attached to one side of the polarizer by roll-to-roll via a polyvinyl alcohol adhesive to obtain an elongated polarizing plate having a protective layer/polarizer structure.
(v) Preparation of polarizing plate with optical compensation layer
The polarizing plate, the first optical compensation layer, and the second optical compensation layer obtained above were cut into predetermined sizes, the polarizer surface of the polarizing plate and the first optical compensation layer were bonded via an acrylic adhesive, and the first optical compensation layer and the second optical compensation layer were further bonded via an acrylic adhesive. In this way, a polarizing plate with an optical compensation layer having a configuration of protective layer/polarizer/first optical compensation layer/second optical compensation layer was obtained. Further, the cutting of the first optical compensation layer was performed so that the angle formed by the absorption axis of the polarizer and the slow axis of the first optical compensation layer in the polarizing plate with an optical compensation layer became 15 °. The second optical compensation layer was cut so that the angle formed by the absorption axis of the polarizer and the slow axis of the second optical compensation layer in the polarizing plate with an optical compensation layer was 75 °. That is, the number of times of the process (RtoS) of cutting and bonding each layer constituting the polarizing plate with the optical compensation layer is two.
The obtained polarizing plate with an optical compensation layer was subjected to the evaluation of the above (3). Further, the reflection characteristics of (4) above were simulated using the characteristics of the obtained polarizing plate with an optical compensation layer. The results are shown in Table 1.
[ example 2]
First and second optical compensation layers were obtained in the same manner as in example 1, except that the stretching temperature and the stretching magnification described in table 1 were used. The obtained first optical compensation layer had Re (550) of 317nm, an Nz coefficient of 0.75 and Re (450)/Re (550) of 1.00. The obtained second optical compensation layer had Re (550) of 136nm, an Nz coefficient of 0.41, and Re (450)/Re (550) of 1.00. The polarizing plate and the first optical compensation layer were bonded by roll-to-roll, and the shrinkable film was peeled off and removed to obtain a protective layer/polarizer/first optical compensation layer laminate. The absorption axis of the polarizer is substantially parallel to the slow axis of the first optical compensation layer. The laminate was cut into a predetermined size, and the second optical compensation layer was cut and laminated so that the angle formed by the absorption axis of the polarizer and the slow axis of the second optical compensation layer became 45 °, to obtain an optical compensation layer-equipped polarizing plate having a configuration of protective layer/polarizer/first optical compensation layer/second optical compensation layer. That is, the number of times of the process (RtoS) of cutting and bonding each layer constituting the polarizing plate with the optical compensation layer is one. An organic EL panel was produced in the same manner as in example 1, except that this polarizing plate with an optical compensation layer was used. The obtained polarizing plate with an optical compensation layer was subjected to the same evaluation as in example 1. The results are shown in Table 1.
Comparative example 1
(i) Fabrication of first optical compensation layer
(i-1) production of polycarbonate resin film
Polymerization was carried out using a batch polymerization apparatus comprising two vertical reactors equipped with stirring blades and a reflux cooler controlled to 100 ℃. Reacting 9,9- [4- (2-hydroxyethoxy) phenyl]Fluorene (BHEPF), Isosorbide (ISB), diethylene glycol (DEG), diphenyl carbonate (DPC) and magnesium acetate tetrahydrate in molar ratios 0.348/0.490/0.162/1.005/1.00 × 10-5The method (1) is carried out. The reactor was sufficiently purged with nitrogen (oxygen concentration of 0.0005 to 0.001 vol%), and then heated with a heat medium, and stirring was started when the internal temperature became 100 ℃. After the temperature was raised for 40 minutes, the internal temperature was increased to 220 ℃ and the temperature was maintainedThe pressure reduction was started simultaneously with the control, and the pressure was set to 13.3kPa for 90 minutes after reaching 220 ℃. Phenol vapor by-produced in association with the polymerization reaction was introduced into a reflux condenser at 100 ℃ to return a monomer component contained in a small amount in the phenol vapor to the reactor, and the phenol vapor that was not condensed was introduced into a condenser at 45 ℃ to be recovered.
After nitrogen was introduced into the first reactor and temporarily returned to atmospheric pressure, the reaction solution in the first reactor, which had been oligomerized, was transferred to the second reactor. Subsequently, the temperature increase and pressure reduction in the second reactor were started, and the internal temperature and pressure were set to 240 ℃ and 0.2kPa for 50 minutes. Then, polymerization was carried out until a predetermined stirring power was obtained. When the reactor reached a predetermined power, nitrogen was introduced into the reactor to recover the pressure, and the reaction solution was withdrawn in the form of strands and pelletized by a rotary cutter to obtain a polycarbonate resin having a copolymerization composition in which BHEPF/ISB/DEG was 34.8/49.0/16.2[ mol% ]. The polycarbonate resin had a reduced viscosity of 0.430dL/g and a glass transition temperature of 128 ℃.
(i-2) production of first optical Compensation layer
The obtained polycarbonate resin was vacuum-dried at 80 ℃ for 5 hours, and then a polycarbonate resin film having a thickness of 130 μm was obtained using a film forming apparatus equipped with a single-screw extruder (manufactured by Isuzu chemical Co., Ltd., screw diameter: 25mm, cylinder set temperature: 220 ℃), T-die (width: 900mm, set temperature: 220 ℃), chill roll (set temperature: 125 ℃) and winder. The water absorption of the obtained polycarbonate resin film was 1.2%.
The polycarbonate resin film obtained as described above was obliquely stretched in accordance with the method of example 1 of japanese patent application laid-open nos. 2014-194483 to obtain a first optical compensation layer. The obtained first optical compensation layer had Re (550) of 139nm, an Nz coefficient of 1.10, and Re (450)/Re (550) of 0.89.
(ii) Fabrication of second optical Compensation layer
A liquid crystal coating liquid was prepared by dissolving 20 parts by weight of a side chain type liquid crystal polymer represented by the following chemical formula (II) (wherein numerals 65 and 35 represent mol% of a monomer unit, for convenience sake, in the form of a block polymer, and the weight average molecular weight is 5000), 80 parts by weight of a polymerizable liquid crystal exhibiting a nematic liquid crystal phase (manufactured by BASF corporation, product name: PaliocolorLC242), and 5 parts by weight of a photopolymerization initiator (manufactured by Ciba refiner, product name: IRGACURE 907) in 200 parts by weight of cyclopentanone. Then, the coating liquid was applied to a substrate film (norbornene resin film: product name "ZEONEX" manufactured by ZEON corporation, Japan) by a wire bar coater, and then heated and dried at 80 ℃ for 4 minutes, thereby aligning the liquid crystal. The liquid crystal layer was cured by irradiating the liquid crystal layer with ultraviolet rays, and a liquid crystal fixing layer (thickness: 0.58 μm) serving as a second optical compensation layer was formed on the substrate. The obtained second optical compensation layer had Re (550) of 0nm and Rth (550) of-71.
Chemical formula 1
The first optical compensation layer and the second optical compensation layer obtained in (i) and (ii) were laminated to each other in a roll-to-roll manner, and the substrate was peeled off and removed to obtain an optical compensation layer-equipped polarizing plate having a configuration of a protective layer/polarizer/first optical compensation layer/second optical compensation layer. The absorption axis of the polarizer makes an angle of 45 ° with the slow axis of the first optical compensation layer. An organic EL surface was produced in the same manner as in example 1, except that this polarizing plate with an optical compensation layer was used. The obtained polarizing plate with an optical compensation layer and the organic EL panel were subjected to the same evaluation as in example 1. The results are shown in Table 1.
Comparative example 2
A polarizing plate with an optical compensation layer having a configuration of protective layer/polarizer/first optical compensation layer/second optical compensation layer was obtained in the same manner as in comparative example 1, except that the thickness of the second optical compensation layer was set to 0.44 μm. The first optical compensation layer had Re (550) of 139nm, an Nz coefficient of 1.00, and Re (450)/Re (550) of 0.89. The second optical compensation layer had Re (550) of 0nm and Rth (550) of-54. An organic EL panel was produced in the same manner as in example 1, except that this polarizing plate with an optical compensation layer was used. The obtained polarizing plate with an optical compensation layer and the organic EL panel were subjected to the same evaluation as in example 1. The results are shown in Table 1.
TABLE 1
The opposite indicates the retardation in the thickness direction (Rth).
[ evaluation ]
As can be seen from Table 1: the polarizing plate with an optical compensation layer according to the example of the present invention can maintain excellent antireflection characteristics in the front direction and also has excellent antireflection characteristics in the oblique direction. Further, according to the example, it was confirmed that the hue in the oblique direction can be set to be neutral.
Industrial applicability
The polarizing plate with an optical compensation layer of the present invention is applicable to an organic EL panel.
Claims (3)
1. A polarizing plate with an optical compensation layer, which is used for an organic EL panel and comprises a polarizer, a first optical compensation layer and a second optical compensation layer in this order,
wherein the first optical compensation layer shows refractive index characteristic that nx is more than Nz and is more than ny, Re (550) is 220 nm-300 nm, Nz coefficient is 0.4-0.8, the angle formed by the absorption axis direction of the polarizer and the slow axis direction of the first optical compensation layer is 5-25 degrees,
the second optical compensation layer shows refractive index characteristic that nx is more than Nz and is more than ny, Re (550) is 90 nm-170 nm, Nz coefficient is 0.4-0.8, the angle formed by the absorption axis direction of the polarizer and the slow axis direction of the second optical compensation layer is 65-85 degrees,
re (450) and Re (550) of the first optical compensation layer and the second optical compensation layer are substantially equal,
here, Re (450) and Re (550) represent in-plane retardation measured with light having a wavelength of 450nm and 550nm at 23 ℃ respectively.
2. A polarizing plate with an optical compensation layer, which is used for an organic EL panel and comprises a polarizer, a first optical compensation layer and a second optical compensation layer in this order,
wherein the first optical compensation layer exhibits a refractive index characteristic of nx > Nz > ny, Re (550) is 280nm to 360nm, Nz coefficient is 0.5 to 0.9, an angle formed by the absorption axis direction of the polarizer and the slow axis direction of the first optical compensation layer is substantially parallel,
the second optical compensation layer shows refractive index characteristic that nx is more than Nz and is more than ny, Re (550) is 100 nm-180 nm, Nz coefficient is 0.2-0.6, the angle formed by the absorption axis direction of the polarizer and the slow axis direction of the second optical compensation layer is 35-55 degrees,
re (450) and Re (550) of the first optical compensation layer and the second optical compensation layer are substantially equal,
here, Re (450) and Re (550) represent in-plane retardation measured with light having a wavelength of 450nm and 550nm at 23 ℃ respectively.
3. An organic EL panel comprising the polarizing plate with an optical compensation layer according to claim 1 or 2.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2020-200007 | 2020-12-02 | ||
| JP2020200007A JP2022087884A (en) | 2020-12-02 | 2020-12-02 | Polarizing plate with optical compensation layers, and organic el panel having the same |
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| CN114578469A true CN114578469A (en) | 2022-06-03 |
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| JP (1) | JP2022087884A (en) |
| KR (1) | KR20220077854A (en) |
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| EP1045261B1 (en) | 1998-10-30 | 2005-02-02 | Teijin Limited | Phase difference film and optical device using it |
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| TW202225745A (en) | 2022-07-01 |
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