WO2017169168A1 - 光学補償層付偏光板およびそれを用いた有機elパネル - Google Patents
光学補償層付偏光板およびそれを用いた有機elパネル Download PDFInfo
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- WO2017169168A1 WO2017169168A1 PCT/JP2017/004894 JP2017004894W WO2017169168A1 WO 2017169168 A1 WO2017169168 A1 WO 2017169168A1 JP 2017004894 W JP2017004894 W JP 2017004894W WO 2017169168 A1 WO2017169168 A1 WO 2017169168A1
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- Prior art keywords
- optical compensation
- compensation layer
- layer
- polarizer
- polarizing plate
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Images
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
- G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
- G02B5/3033—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid
- G02B5/3041—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid comprising multiple thin layers, e.g. multilayer stacks
- G02B5/305—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid comprising multiple thin layers, e.g. multilayer stacks including organic materials, e.g. polymeric layers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- 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
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
- G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
- G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
- G02B5/3033—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid
- G02B5/3041—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid comprising multiple thin layers, e.g. multilayer stacks
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
- G02B5/3083—Birefringent or phase retarding elements
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/80—Constructional details
- H10K50/86—Arrangements for improving contrast, e.g. preventing reflection of ambient light
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/80—Constructional details
- H10K59/8791—Arrangements for improving contrast, e.g. preventing reflection of ambient light
Definitions
- the present invention relates to a polarizing plate with an optical compensation layer and an organic EL panel using the same.
- the present invention has been made in order to solve the above-described conventional problems, and its main purpose is to maintain excellent antireflection characteristics in the front direction and excellent antireflection characteristics in the oblique direction. It is an object of the present invention to provide a polarizing plate with an optical compensation layer that can realize excellent antireflection characteristics over a wide wavelength band and has a neutral hue in an oblique direction.
- the polarizing plate with an optical compensation layer of the present invention is used for an organic EL panel.
- This polarizing plate with an optical compensation layer includes a polarizer, a first optical compensation layer, a second optical compensation layer, and a third optical compensation layer.
- the first optical compensation layer, the second optical compensation layer, and the third optical compensation layer all exhibit refractive index characteristics of nx>nz> ny.
- the first optical compensation layer, the second optical compensation layer, and the third optical compensation layer all satisfy the relationship of Re (450) ⁇ Re (550).
- Re (450) and Re (550) represent in-plane phase differences measured with light having wavelengths of 450 nm and 550 nm at 23 ° C., respectively.
- Re (550) of the first optical compensation layer is 230 nm to 310 nm, and an Nz coefficient is 0.1 to 0.4, and the absorption axis of the polarizer and the first It is substantially orthogonal to the slow axis of one optical compensation layer.
- Re (550) of the second optical compensation layer is 210 nm to 270 nm, and an Nz coefficient is 0.3 to 0.7, and the absorption axis of the polarizer and the first optical compensation layer The angle between the optical compensation layer 2 and the slow axis is 5 ° to 25 °, 65 ° to 85 °, 95 ° to 115 °, or 155 ° to 175 °.
- Re (550) of the third optical compensation layer is 80 nm to 160 nm, and an Nz coefficient is 0.3 to 0.7, and the absorption axis of the polarizer and the first optical compensation layer The angle between the optical compensation layer 3 and the slow axis is 5 ° to 25 °, 65 ° to 85 °, 95 ° to 115 °, or 155 ° to 175 °.
- an organic EL panel is provided. This organic EL panel includes the above polarizing plate with an optical compensation layer.
- the polarizing plate with an optical compensation layer by using three optical compensation layers each having a refractive index characteristic of nx> nz> ny, while maintaining excellent antireflection characteristics in the front direction, it is also possible to obtain a polarizing plate with an optical compensation layer that has excellent antireflection characteristics in the oblique direction, and that such excellent antireflection characteristics can be realized over a wide wavelength band and that the hue in the oblique direction is neutral. it can.
- Refractive index (nx, ny, nz) “Nx” is the refractive index in the direction in which the in-plane refractive index is maximum (ie, the slow axis direction), and “ny” is the direction orthogonal to the slow axis in the plane (ie, the fast axis direction). “Nz” is the refractive index in the thickness direction.
- Refractive index (nx, ny, nz) “Nx” is the refractive index in the direction in which the in-plane refractive index is maximum (ie, the slow axis direction), and “ny” is the direction orthogonal to the slow axis in the plane (ie, the fast axis direction). “Nz” is the refractive index in the thickness direction.
- In-plane retardation (Re) “Re ( ⁇ )” is an in-plane retardation measured with light having a wavelength of ⁇ nm at 23 ° C.
- Re (550) is an in-plane retardation measured with light having a wavelength of 550 nm at 23 ° C.
- Thickness direction retardation (Rth) is a retardation in the thickness direction measured with light having a wavelength of ⁇ nm at 23 ° C.
- Rth (550) is a retardation in the thickness direction measured with light having a wavelength of 550 nm at 23 ° C.
- Substantially orthogonal or parallel include the case where the angle between the two directions is 90 ° ⁇ 10 °, preferably 90 ° ⁇ 7 °. And more preferably 90 ° ⁇ 5 °.
- substantially parallel and “substantially parallel” include the case where the angle between two directions is 0 ° ⁇ 10 °, preferably 0 ° ⁇ 7 °, more preferably 0 ° ⁇ 5 °.
- orthogonal or “parallel” may include a substantially orthogonal state or a substantially parallel state.
- A. 1 is a schematic sectional view of a polarizing plate with an optical compensation layer according to one embodiment of the present invention.
- the polarizing plate 100 with an optical compensation layer of this embodiment includes a polarizer 10, a first optical compensation layer 30, a second optical compensation layer 40, and a third optical compensation layer 50.
- the protective layer 20 can be provided on the opposite side of the polarizer 10 from the first optical compensation layer 30 as in the illustrated example.
- the polarizing plate with an optical compensation layer may include another protective layer (also referred to as an inner protective layer) between the polarizer 10 and the first optical compensation layer 30.
- the inner protective layer is omitted.
- the first optical compensation layer 30 can also function as an inner protective layer.
- the polarizing plate with an optical compensation layer can be further reduced in thickness.
- a conductive layer and a base material may be provided in this order on the opposite side of the third optical compensation layer 50 from the second optical compensation layer 40 (that is, outside the third optical compensation layer 50). Good (both not shown).
- the base material is closely adhered to the conductive layer.
- adhered to the conductive layer “adhesion lamination” means that two layers are directly and firmly laminated without an adhesive layer (for example, an adhesive layer or an adhesive layer).
- the conductive layer and the base material can be typically introduced into the polarizing plate 100 with an optical compensation layer as a laminate of the base material and the conductive layer.
- the first optical compensation layer 30, the second optical compensation layer 40, and the third optical compensation layer 50 each exhibit a refractive index characteristic of nx> nz> ny.
- nx> nz> ny By using three optical compensation layers exhibiting refractive index characteristics of nx> nz> ny, an excellent antireflection characteristic in the front direction due to an excellent circular polarization function is maintained, and the polarizer when viewed from an oblique direction is maintained.
- excellent antireflection characteristics are realized in the oblique direction. Neutral (ie undesired uncolored) hues in the direction can be achieved.
- Each of the first optical compensation layer 30, the second optical compensation layer 40, and the third optical compensation layer 50 typically has a positive chromatic dispersion characteristic in which the phase difference value decreases according to the wavelength of the measurement light, Alternatively, it exhibits a flat wavelength dispersion characteristic in which the phase difference value hardly changes depending on the wavelength of the measurement light.
- each optical compensation layer can be formed of the same material. More specifically, each of the first optical compensation layer 30, the second optical compensation layer 40, and the third optical compensation layer 50 preferably satisfies the relationship of Re (450) ⁇ Re (550), and more preferably. Further satisfies the relationship of Re (550) ⁇ Re (650).
- the 1st optical compensation layer 30, the 2nd optical compensation layer 40, and the 3rd optical compensation layer 50 show the same wavelength dispersion characteristic. Since the three optical compensation layers have the same wavelength dispersion characteristic, the material selection of each optical compensation layer is further facilitated.
- the first optical compensation layer 30 has an in-plane retardation Re (550) of preferably 230 nm to 310 nm.
- the Nz coefficient of the first optical compensation layer is preferably 0.1 to 0.4.
- the slow axis of the first optical compensation layer 30 and the absorption axis of the polarizer 10 are preferably substantially orthogonal.
- the Nz coefficient of the first optical compensation layer is preferably between 0.6 and 0.9. In this case, the slow axis of the first optical compensation layer 30 and the absorption axis of the polarizer 10 are preferably substantially parallel.
- the second optical compensation layer 40 has an in-plane retardation Re (550) of preferably 210 nm to 270 nm and an Nz coefficient of preferably 0.3 to 0.7.
- the third optical compensation layer 50 has an in-plane retardation Re (550) of preferably 80 nm to 160 nm and an Nz coefficient of preferably 0.3 to 0.7.
- the angle formed by the slow axis of the second optical compensation layer 40 and the absorption axis of the polarizer 10 is preferably 65 ° to 85 ° or 155 ° to 175 °.
- the angle formed by the slow axis of the third optical compensation layer 50 and the absorption axis of the polarizer 10 is preferably 5 ° to 25 ° or 95 ° to 115 °.
- the angle formed by the slow axis of the second optical compensation layer 40 and the absorption axis of the polarizer 10 is preferably 5 ° to 25 ° or 95 ° to 115 °.
- the angle formed by the slow axis of the third optical compensation layer 50 and the absorption axis of the polarizer 10 is preferably 65 ° to 85 ° or 155 ° to 175 °.
- each optical compensation layer when the absorption axis direction of the polarizer is 0 °.
- the slow axis directions are as follows: polarizer (0 °) / first optical compensation layer (90 °) / second optical compensation layer (75 °) / third optical compensation layer (15 °).
- a first optical compensation layer 30, a second optical compensation layer 40, and a third optical compensation layer 50 are arranged in this order from the polarizer 10 side.
- the resin film forming the polarizer may be a single-layer resin film or a laminate of two or more layers.
- polarizers composed of a single-layer resin film include hydrophilic polymer films such as polyvinyl alcohol (PVA) films, partially formalized PVA films, and ethylene / vinyl acetate copolymer partially saponified films.
- PVA polyvinyl alcohol
- polyene-based oriented films such as those subjected to dyeing treatment and stretching treatment with dichroic substances such as iodine and dichroic dyes, PVA dehydrated products and polyvinyl chloride dehydrochlorinated products.
- a polarizer obtained by dyeing a PVA film with iodine and uniaxially stretching is used because of excellent optical properties.
- the dyeing with iodine is performed, for example, by immersing a PVA film in an aqueous iodine solution.
- the stretching ratio of the uniaxial stretching is preferably 3 to 7 times.
- the stretching may be performed after the dyeing treatment or may be performed while dyeing. Moreover, you may dye
- the PVA film is subjected to swelling treatment, crosslinking treatment, washing treatment, drying treatment and the like. For example, by immersing the PVA film in water and washing it before dyeing, not only can the surface of the PVA film be cleaned of dirt and anti-blocking agents, but the PVA film can be swollen to cause uneven staining. Can be prevented.
- a polarizer obtained by using a laminate a laminate of a resin substrate and a PVA resin layer (PVA resin film) laminated on the resin substrate, or a resin substrate and the resin
- a polarizer obtained by using a laminate with a PVA resin layer applied and formed on a substrate examples thereof include a polarizer obtained by using a laminate with a PVA resin layer applied and formed on a substrate.
- a polarizer obtained by using a laminate of a resin base material and a PVA resin layer applied and formed on the resin base material may be obtained by, for example, applying a PVA resin solution to a resin base material and drying it.
- a PVA-based resin layer is formed thereon to obtain a laminate of a resin base material and a PVA-based resin layer; the laminate is stretched and dyed to make the PVA-based resin layer a polarizer; obtain.
- stretching typically includes immersing the laminate in an aqueous boric acid solution and stretching.
- the stretching may further include, if necessary, stretching the laminate in the air at a high temperature (for example, 95 ° C. or higher) before stretching in the aqueous boric acid solution.
- the obtained resin base material / polarizer laminate may be used as it is (that is, the resin base material may be used as a protective layer of the polarizer), and the resin base material is peeled from the resin base material / polarizer laminate.
- Any appropriate protective layer according to the purpose may be laminated on the release surface. Details of a method for manufacturing such a polarizer are described in, for example, Japanese Patent Application Laid-Open No. 2012-73580. This publication is incorporated herein by reference in its entirety.
- the thickness of the polarizer is preferably 25 ⁇ m or less, more preferably 1 ⁇ m to 12 ⁇ m, still more preferably 3 ⁇ m to 12 ⁇ m, and particularly preferably 3 ⁇ m to 8 ⁇ m.
- the thickness of the polarizer is in such a range, curling during heating can be satisfactorily suppressed, and good appearance durability during heating can be obtained.
- the polarizer preferably exhibits absorption dichroism at any wavelength between 380 nm and 780 nm.
- the single transmittance of the polarizer is preferably 42.0% to 46.0%, more preferably 44.5% to 46.0%.
- the polarization degree of the polarizer is preferably 97.0% or more, more preferably 99.0% or more, and further preferably 99.9% or more.
- the first optical compensation layer 30 has a relationship of refractive index characteristics of nx>nz> ny.
- the in-plane retardation Re (550) of the first optical compensation layer is preferably 230 nm to 310 nm, more preferably 240 nm to 300 nm, and further preferably 260 nm to 280 nm. If the in-plane retardation of the first optical compensation layer is in such a range, the polarizer is made by making the slow axis of the first optical compensation layer substantially orthogonal to the absorption axis of the polarizer. It is possible to prevent a decrease in the antireflection function in the oblique direction due to the apparent axial deviation of the absorption axis.
- the Nz coefficient of the first optical compensation layer is preferably 0.1 to 0.4, more preferably 0.2 to 0.3, and even more preferably 0.23 to 0.27. If the Nz coefficient is in such a range, by combining the slow axis of the first optical compensation layer and the absorption axis of the polarizer substantially orthogonally, combined with the effect of the in-plane retardation, Better oblique antireflection properties can be achieved.
- the Nz coefficient of the first optical compensation layer is preferably 0.6 to 0.9, more preferably 0.7 to 0.8, and still more preferably 0.73 to 0.93. 0.77. If the Nz coefficient is in such a range, the same effect can be achieved by making the slow axis of the first optical compensation layer and the absorption axis of the polarizer substantially parallel.
- the first optical compensation layer is preferably a positive chromatic dispersion characteristic in which the phase difference value decreases according to the wavelength of the measurement light, or a flat in which the phase difference value hardly changes depending on the wavelength of the measurement light. Chromatic dispersion characteristics. Since the first optical compensation layer exhibits such wavelength dispersion characteristics, it is possible to widen the band by a laminated configuration with other optical compensation layers.
- the first optical compensation layer preferably satisfies the relationship of Re (450) ⁇ Re (550).
- Re (450) / Re (550) is preferably 1.00 to 1.20, more preferably 1.00 to 1.15.
- the first optical compensation layer preferably satisfies the relationship of Re (550) ⁇ Re (650).
- Re (550) / Re (650) is preferably 1.00 to 1.11, more preferably 1.00 to 1.08.
- the first optical compensation layer is typically a retardation film formed of any appropriate resin capable of realizing the above characteristics.
- the resin forming the retardation film include polyarylate, polyamide, polyimide, polyester, polyaryletherketone, polyamideimide, polyesterimide, polyvinyl alcohol, polyfumaric acid ester, polyethersulfone, polysulfone, and norbornene resin.
- a polycarbonate resin, a cellulose resin, and a polyurethane are mentioned. These resins may be used alone or in combination.
- Polyarylate or polycarbonate resin is preferable, and polycarbonate resin or polyarylate represented by the following formula (I) is more preferable.
- a and B each represent a substituent, which is a halogen atom, an alkyl group having 1 to 6 carbon atoms, or a substituted or unsubstituted aryl group, and A and B are the same or different. Also good. a and b represent the corresponding numbers of substitutions of A and B, and are integers of 1 to 4, respectively.
- D is a covalent bond, CH 2 group, C (CH 3 ) 2 group, C (CZ 3 ) 2 group (where Z is a halogen atom), CO group, O atom, S atom, SO 2 group, Si (CH 2 CH 3 ) 2 groups and N (CH 3 ) groups.
- R1 is a linear or branched alkyl group having 1 to 10 carbon atoms, or a substituted or unsubstituted aryl group.
- R2 is a linear or branched alkyl group having 2 to 10 carbon atoms, or a substituted or unsubstituted aryl group.
- R3, R4, R5 and R6 are each independently a hydrogen atom or a linear or branched alkyl group having 1 to 4 carbon atoms, and R3, R4, R5 and R6 may be the same or different.
- p1 is an integer of 0 to 3
- p2 is an integer of 1 to 3
- n is an integer of 2 or more.
- the first optical compensation layer can be formed, for example, by applying a coating solution obtained by dissolving or dispersing the resin in any appropriate solvent to a shrinkable film to form a coating film, and then shrinking the coating film. .
- a coating solution obtained by dissolving or dispersing the resin in any appropriate solvent
- the laminate of the contractible film and the coating film is heated to contract the contractible film, and the contraction of the contractible film causes the coating film to contract.
- the shrinkage ratio of the coating film is preferably 0.50 to 0.99, more preferably 0.60 to 0.98, and still more preferably 0.70 to 0.95.
- the heating temperature is preferably 130 ° C. to 170 ° C., more preferably 150 ° C. to 160 ° C.
- a layered product when shrinking a coating film, may be extended in the direction orthogonal to the shrinkage direction.
- the stretch ratio of the laminate is preferably 1.01 to 3.0 times, more preferably 1.05 to 2.0 times, and even more preferably 1.10 times to 1.50. Is double.
- the material constituting the shrinkable film include polyolefin, polyester, acrylic resin, polyamide, polycarbonate, norbornene resin, polystyrene, polyvinyl chloride, polyvinylidene chloride, cellulose resin, polyethersulfone, polysulfone, polyimide, polyacrylic. , Acetate resin, polyarylate, polyvinyl alcohol, and liquid crystal polymer. These may be used alone or in combination.
- the shrinkable film is preferably a stretched film formed from these materials.
- the first optical compensation layer is formed by pasting a shrinkable film using, for example, an acrylic adhesive on one or both sides of a film formed of the resin, and then heating the laminate to shrink the laminate. Can be formed.
- the thickness of the first optical compensation layer is preferably 10 ⁇ m to 150 ⁇ m, more preferably 10 ⁇ m to 50 ⁇ m, and further preferably 10 ⁇ m to 30 ⁇ m. With such a thickness, the desired in-plane retardation and Nz coefficient can be obtained.
- the second optical compensation layer 40 has a refractive index characteristic of nx>nz> ny.
- the angle formed by the slow axis of the second optical compensation layer 40 and the absorption axis of the polarizer 10 is preferably 65 ° to 85 °, more preferably 70 °, as described above. It is ⁇ 80 °, more preferably 73 ° to 77 °, and particularly preferably about 75 °.
- the angle is preferably 155 ° to 175 °, more preferably 160 ° to 170 °, and still more preferably 163 ° to 167 °, as described above. Particularly preferred is about 165 °.
- the angle formed between the slow axis of the second optical compensation layer 40 and the absorption axis of the polarizer 10 is preferably 5 ° to 25 °, more preferably 10 °, as described above. It is ⁇ 20 °, more preferably 13 ° to 17 °, and particularly preferably about 15 °. In another example of the present embodiment, the angle is preferably 95 ° to 115 °, more preferably 100 ° to 110 °, and still more preferably 103 ° to 107 °, as described above. Particularly preferred is about 105 °. By setting the angle in such a range, a more excellent antireflection characteristic in an oblique direction can be achieved by a synergistic effect with the effect of the in-plane retardation and Nz coefficient of the second optical compensation layer. .
- the in-plane retardation Re (550) of the second optical compensation layer is preferably 210 nm to 270 nm, more preferably 220 nm to 260 nm, and further preferably 230 nm to 250 nm.
- the Nz coefficient of the second optical compensation layer is preferably 0.3 to 0.7, more preferably 0.4 to 0.6, still more preferably 0.45 to 0.55, and particularly Preferably it is about 0.5. If the Nz coefficient of the second optical compensation layer is in such a range, the angle formed by the slow axis of the second optical compensation layer and the absorption axis of the polarizer is, for example, 65 ° to 85 ° (as described above). In particular, by setting the angle to about 75 ° or 155 ° to 175 ° (particularly, about 165 °), it is possible to achieve better antireflection characteristics in an oblique direction combined with the effect of the in-plane retardation.
- the second optical compensation layer is preferably a positive chromatic dispersion characteristic in which the phase difference value decreases according to the wavelength of the measurement light, or a flat in which the phase difference value hardly changes depending on the wavelength of the measurement light. Chromatic dispersion characteristics. Since the second optical compensation layer exhibits such a wavelength dispersion characteristic, it is possible to widen the band by a laminated configuration with other optical compensation layers.
- the second optical compensation layer preferably satisfies the relationship of Re (450) ⁇ Re (550).
- Re (450) / Re (550) is preferably 1.00 to 1.20, more preferably 1.00 to 1.15.
- the second optical compensation layer preferably satisfies the relationship of Re (550) ⁇ Re (650).
- Re (550) / Re (650) is preferably 1.00 to 1.11, more preferably 1.00 to 1.08.
- the thickness of the second optical compensation layer is preferably 10 ⁇ m to 150 ⁇ m, more preferably 10 ⁇ m to 50 ⁇ m, and further preferably 10 ⁇ m to 30 ⁇ m. With such a thickness, the desired in-plane retardation and Nz coefficient can be obtained.
- the constituent material and the forming method of the second optical compensation layer are as described in the above section A-2 for the first optical compensation layer.
- the third optical compensation layer 50 has a relationship of refractive index characteristics of nx>nz> ny.
- the angle formed by the slow axis of the third optical compensation layer 50 and the absorption axis of the polarizer 10 is preferably 5 ° to 25 °, more preferably 10 °, as described above. It is ⁇ 20 °, more preferably 13 ° to 17 °, and particularly preferably about 15 °.
- the angle is preferably 95 ° to 115 °, more preferably 100 ° to 110 °, and still more preferably 103 ° to 107 °, as described above. Particularly preferred is about 105 °.
- the angle formed by the slow axis of the third optical compensation layer 50 and the absorption axis of the polarizer 10 is preferably 65 ° to 85 °, more preferably 70 °, as described above. It is ⁇ 80 °, more preferably 73 ° to 77 °, and particularly preferably about 75 °.
- the angle is preferably 155 ° to 175 °, more preferably 160 ° to 170 °, and still more preferably 163 ° to 167 °, as described above. Particularly preferred is about 165 °.
- the in-plane retardation Re (550) of the third optical compensation layer is preferably 80 nm to 160 nm, more preferably 100 nm to 140 nm, and still more preferably 110 nm to 130 nm.
- the Nz coefficient of the third optical compensation layer is preferably 0.3 to 0.7, more preferably 0.4 to 0.6, still more preferably 0.45 to 0.55, and particularly Preferably it is about 0.5. If the Nz coefficient of the third optical compensation layer is in such a range, the angle formed by the slow axis of the third optical compensation layer and the absorption axis of the polarizer is, for example, 5 ° to 25 ° (as described above). In particular, by setting the angle to about 15 ° or 95 ° to 115 ° (particularly, around 105 °), it is possible to achieve more excellent antireflection characteristics in the oblique direction in combination with the effect of the in-plane retardation.
- the third optical compensation layer is preferably a positive chromatic dispersion characteristic in which the phase difference value decreases according to the wavelength of the measurement light, or a flat in which the phase difference value hardly changes depending on the wavelength of the measurement light. Chromatic dispersion characteristics. Since the third optical compensation layer exhibits such a wavelength dispersion characteristic, it is possible to widen the band by a laminated configuration with other optical compensation layers.
- the third optical compensation layer preferably satisfies the relationship of Re (450) ⁇ Re (550).
- Re (450) / Re (550) is preferably 1.00 to 1.20, more preferably 1.00 to 1.15.
- the third optical compensation layer preferably satisfies the relationship of Re (550) ⁇ Re (650).
- Re (550) / Re (650) is preferably 1.00 to 1.11, more preferably 1.00 to 1.08.
- the thickness of the third optical compensation layer is preferably 5 ⁇ m to 150 ⁇ m, more preferably 5 ⁇ m to 50 ⁇ m, and further preferably 5 ⁇ m to 30 ⁇ m. With such a thickness, the desired in-plane retardation and Nz coefficient can be obtained.
- the constituent material and the formation method of the third optical compensation layer are as described in the above section A-2 for the first optical compensation layer.
- the protective layer 20 is formed of any suitable film that can be used as a protective layer for a polarizer.
- the material as the main component of the film include cellulose resins such as triacetyl cellulose (TAC), polyester-based, polyvinyl alcohol-based, polycarbonate-based, polyamide-based, polyimide-based, polyethersulfone-based, and polysulfone-based materials.
- transparent resins such as polystyrene, polynorbornene, polyolefin, (meth) acryl, and acetate.
- thermosetting resins such as (meth) acrylic, urethane-based, (meth) acrylurethane-based, epoxy-based, and silicone-based or ultraviolet curable resins are also included.
- a glassy polymer such as a siloxane polymer is also included.
- a polymer film described in JP-A-2001-343529 (WO01 / 37007) can also be used.
- a resin composition containing a thermoplastic resin having a substituted or unsubstituted imide group in the side chain and a thermoplastic resin having a substituted or unsubstituted phenyl group and nitrile group in the side chain for example, a resin composition having an alternating copolymer of isobutene and N-methylmaleimide and an acrylonitrile / styrene copolymer can be mentioned.
- the polymer film can be, for example, an extruded product of the resin composition.
- the protective layer 20 may be subjected to a surface treatment such as a hard coat treatment, an antireflection treatment, an antisticking treatment, and an antiglare treatment as necessary. Further / or, if necessary, the protective layer 20 may be treated to improve visibility when viewed through polarized sunglasses (typically, an (elliptical) circular polarization function is imparted, an ultrahigh phase difference is provided. May be applied). By performing such processing, excellent visibility can be achieved even when the display screen is viewed through a polarizing lens such as polarized sunglasses. Therefore, the polarizing plate with an optical compensation layer can be suitably applied to an image display device that can be used outdoors.
- polarized sunglasses typically, an (elliptical) circular polarization function is imparted, an ultrahigh phase difference is provided. May be applied.
- the thickness of the protective layer 20 is typically 5 mm or less, preferably 1 mm or less, more preferably 1 ⁇ m to 500 ⁇ m, and even more preferably 5 ⁇ m to 150 ⁇ m.
- the thickness of the protective layer is a thickness including the thickness of the surface treatment layer.
- the inner protective layer is preferably optically isotropic.
- “optically isotropic” means that the in-plane retardation Re (550) is 0 nm to 10 nm and the thickness direction retardation Rth (550) is ⁇ 10 nm to +10 nm.
- the inner protective layer can be composed of any suitable material as long as it is optically isotropic. The material may be appropriately selected from the materials described above for the protective layer 20, for example.
- the thickness of the inner protective layer is preferably 5 ⁇ m to 200 ⁇ m, more preferably 10 ⁇ m to 100 ⁇ m, and still more preferably 15 ⁇ m to 95 ⁇ m.
- Conductive layer or conductive layer with substrate can be formed on any suitable substrate by any suitable film formation method (eg, vacuum deposition, sputtering, CVD, ion plating, spraying, etc.). Further, it can be formed by forming a metal oxide film. After film formation, heat treatment (for example, 100 ° C. to 200 ° C.) may be performed as necessary. By performing the heat treatment, the amorphous film can be crystallized.
- the metal oxide include indium oxide, tin oxide, zinc oxide, indium-tin composite oxide, tin-antimony composite oxide, zinc-aluminum composite oxide, and indium-zinc composite oxide.
- the indium oxide may be doped with divalent metal ions or tetravalent metal ions.
- Indium composite oxides are preferable, and indium-tin composite oxide (ITO) is more preferable.
- ITO indium-tin composite oxide
- Indium composite oxides are characterized by high transmittance (for example, 80% or more) in the visible light region (380 nm to 780 nm) and low surface resistance per unit area.
- the thickness of the conductive layer is preferably 50 nm or less, more preferably 35 nm or less.
- the lower limit of the thickness of the conductive layer is preferably 10 nm.
- the surface resistance value of the conductive layer is preferably 300 ⁇ / ⁇ or less, more preferably 150 ⁇ / ⁇ or less, and further preferably 100 ⁇ / ⁇ or less.
- the conductive layer may be transferred from the base material to the third optical compensation layer, and the conductive layer alone may be used as a constituent layer of the polarizing plate with an optical compensation layer, or a laminate with the base material (conductive layer with base material). May be laminated on the third optical compensation layer.
- the conductive layer and the base material can be introduced into the polarizing plate with an optical compensation layer as a conductive layer with a base material.
- Any suitable resin may be used as the material constituting the base material.
- it is resin excellent in transparency.
- Specific examples include cyclic olefin resins, polycarbonate resins, cellulose resins, polyester resins, and acrylic resins.
- the substrate is optically isotropic. Therefore, the conductive layer can be used as a conductive layer with an isotropic substrate in a polarizing plate with an optical compensation layer.
- the material constituting the optically isotropic substrate include, for example, a material having a main skeleton such as a norbornene-based resin or an olefin-based resin, a lactone ring, or glutar Examples thereof include materials having a cyclic structure such as an imide ring in the main chain of the acrylic resin. When such a material is used, when an isotropic substrate is formed, it is possible to suppress the expression of the phase difference accompanying the orientation of the molecular chain.
- the thickness of the substrate is preferably 10 ⁇ m to 200 ⁇ m, more preferably 20 ⁇ m to 60 ⁇ m.
- the pressure-sensitive adhesive layer is typically formed of an acrylic pressure-sensitive adhesive.
- the adhesive layer is typically formed of a polyvinyl alcohol-based adhesive.
- an adhesive layer may be provided on the third optical compensation layer 50 side of the polarizing plate 100 with the optical compensation layer.
- the pressure-sensitive adhesive layer By providing the pressure-sensitive adhesive layer in advance, it can be easily bonded to another optical member (for example, an organic EL cell).
- the peeling film is bonded together on the surface of this adhesive layer until it uses.
- the organic EL panel of the present invention includes an organic EL cell and the polarizing plate with an optical compensation layer described in the above section A on the viewing side of the organic EL cell.
- the polarizing plate with an optical compensation layer is laminated so that the third optical compensation layer is on the organic EL cell side (so that the polarizer is on the viewing side).
- the present invention will be specifically described by way of examples, but the present invention is not limited to these examples.
- the measuring method of each characteristic is as follows.
- Thickness The thickness was measured using a dial gauge (manufactured by PEACOCK, product name “DG-205”, dial gauge stand (product name “pds-2”)).
- Retardation A 50 mm ⁇ 50 mm sample was cut out from each optical compensation layer to obtain a measurement sample, and measurement was performed using Axoscan manufactured by Axometrics. The measurement wavelength was 450 nm, 550 nm, and the measurement temperature was 23 ° C.
- the average refractive index was measured using an Abbe refractometer manufactured by Atago Co., Ltd., and the refractive indexes nx, ny, and nz were calculated from the obtained retardation values.
- the front reflection hue was evaluated as ⁇ u′v ′ (neutral) from the neutral point, and the oblique hue was evaluated as a color shift ⁇ u′v ′ at a polar angle of 60 ° and an azimuth angle of 0 ° to 360 °.
- the polycondensation solution was allowed to stand and separate to separate a toluene solution containing polyarylate.
- the separation liquid was washed with acetic acid water and further washed with ion exchange water, and then poured into methanol to precipitate polyarylate.
- the precipitated polyarylate was filtered and dried under reduced pressure to obtain 34.1 kg of white polyarylate (yield 92%).
- the birefringence ( ⁇ n xz ) of the polyarylate was 0.012.
- the weight ratio of iodine and potassium iodide is 1: 7, the iodine concentration of which is adjusted so that the single transmittance of the obtained polarizer is 45.0%.
- the film was stretched 1.4 times.
- the crosslinking treatment employed a two-stage crosslinking treatment, and the first-stage crosslinking treatment was stretched 1.2 times while being treated in an aqueous solution in which boric acid and potassium iodide were dissolved at 40 ° C.
- the boric acid content of the aqueous solution of the first-stage crosslinking treatment was 5.0% by weight, and the potassium iodide content was 3.0% by weight.
- the cross-linking treatment at the second stage was stretched 1.6 times while being treated in an aqueous solution in which boric acid and potassium iodide were dissolved at 65 ° C.
- the boric acid content of the aqueous solution of the second crosslinking treatment was 4.3% by weight, and the potassium iodide content was 5.0% by weight.
- the cleaning treatment was performed with an aqueous potassium iodide solution at 20 ° C.
- the potassium iodide content of the aqueous solution for the washing treatment was 2.6% by weight.
- the drying process was performed at 70 ° C. for 5 minutes to obtain a polarizer.
- V Production of Polarizing Plate HC-TAC film (thickness: having a hard coat (HC) layer formed on one side of the TAC film by a hard coat treatment on one side of the polarizer via a polyvinyl alcohol-based adhesive. 32 ⁇ m, corresponding to the protective layer) was bonded by roll-to-roll to obtain a long polarizing plate having a protective layer / polarizer configuration.
- the cutting of the first optical compensation layer is performed so that the absorption axis of the polarizer and the slow axis of the first optical compensation layer are substantially orthogonal to each other in the polarizing plate with the optical compensation layer;
- the compensation layer is cut so that the angle formed by the absorption axis of the polarizer and the slow axis of the second optical compensation layer is 75 °;
- the third optical compensation layer is cut by the absorption axis of the polarizer.
- the slow axis of the third optical compensation layer were set to 15 °.
- Example 2 The absorption axis of the polarizer and the slow axis of the second optical compensation layer are 15 °, and the absorption axis of the polarizer and the slow axis of the third optical compensation layer are 75 °.
- an organic EL panel was produced in the same manner as in Example 1 except that this polarizing plate with an optical compensation layer was used.
- the obtained polarizing plate with an optical compensation layer and the organic EL panel were subjected to the same evaluation as in Example 1. The results are shown in Table 1.
- the polarizing plate with an optical compensation layer of the example of the present invention is excellent in both antireflection characteristics (reflection intensity) and reflection hue both in the front direction and in the oblique direction.
- the polarizing plate with an optical compensation layer of the present invention is suitably used for an organic EL panel.
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Abstract
Description
1つの実施形態においては、上記第1の光学補償層、上記第2の光学補償層および上記第3の光学補償層はいずれも、Re(450)≧Re(550)の関係を満たす。ここで、Re(450)およびRe(550)は、それぞれ、23℃における波長450nmおよび550nmの光で測定した面内位相差を表す。
1つの実施形態においては、上記第1の光学補償層のRe(550)は230nm~310nmであり、および、Nz係数は0.1~0.4であり、上記偏光子の吸収軸と該第1の光学補償層の遅相軸とは実質的に直交している。
1つの実施形態においては、上記第2の光学補償層のRe(550)は210nm~270nmであり、および、Nz係数は0.3~0.7であり、上記偏光子の吸収軸と該第2の光学補償層の遅相軸とのなす角度は5°~25°、65°~85°、95°~115°、または155°~175°である。
1つの実施形態においては、上記第3の光学補償層のRe(550)は80nm~160nmであり、および、Nz係数は0.3~0.7であり、上記偏光子の吸収軸と該第3の光学補償層の遅相軸とのなす角度は5°~25°、65°~85°、95°~115°、または155°~175°である。
本発明の別の局面によれば、有機ELパネルが提供される。この有機ELパネルは、上記の光学補償層付偏光板を備える。
本明細書における用語および記号の定義は下記の通りである。
(1)屈折率(nx、ny、nz)
「nx」は面内の屈折率が最大になる方向(すなわち、遅相軸方向)の屈折率であり、「ny」は面内で遅相軸と直交する方向(すなわち、進相軸方向)の屈折率であり、「nz」は厚み方向の屈折率である。
(2)面内位相差(Re)
「Re(λ)」は、23℃における波長λnmの光で測定した面内位相差である。Re(λ)は、層(フィルム)の厚みをd(nm)としたとき、式:Re=(nx-ny)×dによって求められる。例えば、「Re(550)」は、23℃における波長550nmの光で測定した面内位相差である。
(3)厚み方向の位相差(Rth)
「Rth(λ)」は、23℃における波長λnmの光で測定した厚み方向の位相差である。Rth(λ)は、層(フィルム)の厚みをd(nm)としたとき、式:Rth=(nx-nz)×dによって求められる。例えば、「Rth(550)」は、23℃における波長550nmの光で測定した厚み方向の位相差である。
(4)Nz係数
Nz係数は、Nz=Rth/Reによって求められる。
(5)実質的に直交または平行
「実質的に直交」および「略直交」という表現は、2つの方向のなす角度が90°±10°である場合を包含し、好ましくは90°±7°であり、さらに好ましくは90°±5°である。「実質的に平行」および「略平行」という表現は、2つの方向のなす角度が0°±10°である場合を包含し、好ましくは0°±7°であり、さらに好ましくは0°±5°である。さらに、本明細書において単に「直交」または「平行」というときは、実質的に直交または実質的に平行な状態を含み得るものとする。
図1は、本発明の1つの実施形態による光学補償層付偏光板の概略断面図である。本実施形態の光学補償層付偏光板100は、偏光子10と第1の光学補償層30と第2の光学補償層40と第3の光学補償層50とを備える。実用的には、図示例のように、偏光子10の第1の光学補償層30と反対側に保護層20が設けられ得る。また、光学補償層付偏光板は、偏光子10と第1の光学補償層30との間に別の保護層(内側保護層とも称する)を備えてもよい。図示例においては、内側保護層は省略されている。この場合、第1の光学補償層30が内側保護層としても機能し得る。このような構成であれば、光学補償層付偏光板のさらなる薄型化が実現され得る。さらに、必要に応じて、第3の光学補償層50の第2の光学補償層40と反対側(すなわち、第3の光学補償層50の外側)に導電層および基材をこの順に設けてもよい(いずれも図示せず)。基材は、導電層に密着積層されている。本明細書において「密着積層」とは、2つの層が接着層(例えば、接着剤層、粘着剤層)を介在することなく直接かつ固着して積層されていることをいう。導電層および基材は、代表的には、基材と導電層との積層体として光学補償層付偏光板100に導入され得る。導電層および基材をさらに設けることにより、光学補償層付偏光板100は、インナータッチパネル型入力表示装置に好適に用いられ得る。
偏光子10としては、任意の適切な偏光子が採用され得る。例えば、偏光子を形成する樹脂フィルムは、単層の樹脂フィルムであってもよく、二層以上の積層体であってもよい。
第1の光学補償層30は、上述のとおり、屈折率特性がnx>nz>nyの関係を示す。第1の光学補償層の面内位相差Re(550)は、好ましくは230nm~310nmであり、より好ましくは240nm~300nmであり、さらに好ましくは260nm~280nmである。第1の光学補償層の面内位相差がこのような範囲であれば、第1の光学補償層の遅相軸を偏光子の吸収軸に対して実質的に直交とすることにより、偏光子の吸収軸の見かけ上の軸ズレに起因する斜め方向の反射防止機能の低下を防止することができる。
第2の光学補償層40は、上記のとおり、屈折率特性がnx>nz>nyの関係を示す。1つの実施形態においては、第2の光学補償層40の遅相軸と偏光子10の吸収軸とのなす角度は、上記のとおり、好ましくは65°~85°であり、より好ましくは70°~80°であり、さらに好ましくは73°~77°であり、特に好ましくは約75°である。本実施形態の別の例においては、当該角度は、上記のとおり、好ましくは155°~175°であり、より好ましくは160°~170°であり、さらに好ましくは163°~167°であり、特に好ましくは約165°である。別の実施形態においては、第2の光学補償層40の遅相軸と偏光子10の吸収軸とのなす角度は、上記のとおり、好ましくは5°~25°であり、より好ましくは10°~20°であり、さらに好ましくは13°~17°であり、特に好ましくは約15°である。本実施形態の別の例においては、当該角度は、上記のとおり、好ましくは95°~115°であり、より好ましくは100°~110°であり、さらに好ましくは103°~107°であり、特に好ましくは約105°である。当該角度をこのような範囲に設定することにより、第2の光学補償層の面内位相差およびNz係数による効果との相乗的な効果により、より優れた斜め方向の反射防止特性を達成し得る。
第3の光学補償層50は、上記のとおり、屈折率特性がnx>nz>nyの関係を示す。1つの実施形態においては、第3の光学補償層50の遅相軸と偏光子10の吸収軸とのなす角度は、上記のとおり、好ましくは5°~25°であり、より好ましくは10°~20°であり、さらに好ましくは13°~17°であり、特に好ましくは約15°である。本実施形態の別の例においては、当該角度は、上記のとおり、好ましくは95°~115°であり、より好ましくは100°~110°であり、さらに好ましくは103°~107°であり、特に好ましくは約105°である。別の実施形態においては、第3の光学補償層50の遅相軸と偏光子10の吸収軸とのなす角度は、上記のとおり、好ましくは65°~85°であり、より好ましくは70°~80°であり、さらに好ましくは73°~77°であり、特に好ましくは約75°である。本実施形態の別の例においては、当該角度は、上記のとおり、好ましくは155°~175°であり、より好ましくは160°~170°であり、さらに好ましくは163°~167°であり、特に好ましくは約165°である。当該角度をこのような範囲に設定することにより、第3の光学補償層の面内位相差およびNz係数による効果との相乗的な効果により、より優れた斜め方向の反射防止特性を達成し得る。
保護層20は、偏光子の保護層として使用できる任意の適切なフィルムで形成される。当該フィルムの主成分となる材料の具体例としては、トリアセチルセルロース(TAC)等のセルロース系樹脂や、ポリエステル系、ポリビニルアルコール系、ポリカーボネート系、ポリアミド系、ポリイミド系、ポリエーテルスルホン系、ポリスルホン系、ポリスチレン系、ポリノルボルネン系、ポリオレフィン系、(メタ)アクリル系、アセテート系等の透明樹脂等が挙げられる。また、(メタ)アクリル系、ウレタン系、(メタ)アクリルウレタン系、エポキシ系、シリコーン系等の熱硬化型樹脂または紫外線硬化型樹脂等も挙げられる。この他にも、例えば、シロキサン系ポリマー等のガラス質系ポリマーも挙げられる。また、特開2001-343529号公報(WO01/37007)に記載のポリマーフィルムも使用できる。このフィルムの材料としては、例えば、側鎖に置換または非置換のイミド基を有する熱可塑性樹脂と、側鎖に置換または非置換のフェニル基ならびにニトリル基を有する熱可塑性樹脂を含有する樹脂組成物が使用でき、例えば、イソブテンとN-メチルマレイミドからなる交互共重合体と、アクリロニトリル・スチレン共重合体とを有する樹脂組成物が挙げられる。当該ポリマーフィルムは、例えば、上記樹脂組成物の押出成形物であり得る。
導電層は、任意の適切な成膜方法(例えば、真空蒸着法、スパッタリング法、CVD法、イオンプレーティング法、スプレー法等)により、任意の適切な基材上に、金属酸化物膜を成膜して形成され得る。成膜後、必要に応じて加熱処理(例えば、100℃~200℃)を行ってもよい。加熱処理を行うことにより、非晶質膜が結晶化し得る。金属酸化物としては、例えば、酸化インジウム、酸化スズ、酸化亜鉛、インジウム-スズ複合酸化物、スズ-アンチモン複合酸化物、亜鉛-アルミニウム複合酸化物、インジウム-亜鉛複合酸化物が挙げられる。インジウム酸化物には2価金属イオンまたは4価金属イオンがドープされていてもよい。好ましくはインジウム系複合酸化物であり、より好ましくはインジウム-スズ複合酸化物(ITO)である。インジウム系複合酸化物は、可視光領域(380nm~780nm)で高い透過率(例えば、80%以上)を有し、かつ、単位面積当たりの表面抵抗値が低いという特徴を有している。
本発明の光学補償層付偏光板を構成する各層の積層には、任意の適切な粘着剤層または接着剤層が用いられる。粘着剤層は、代表的にはアクリル系粘着剤で形成される。接着剤層は、代表的にはポリビニルアルコール系接着剤で形成される。
本発明の有機ELパネルは、有機ELセルと、該有機ELセルの視認側に上記A項に記載の光学補償層付偏光板と、を備える。光学補償層付偏光板は、第3の光学補償層が有機ELセル側となるように(偏光子が視認側となるように)積層されている。
ダイヤルゲージ(PEACOCK社製、製品名「DG-205」、ダイヤルゲージスタンド(製品名「pds-2」))を用いて測定した。
(2)位相差
各光学補償層から50mm×50mmのサンプルを切り出して測定サンプルとし、Axometrics社製のAxoscanを用いて測定した。測定波長は450nm、550nm、測定温度は23℃であった。
また、アタゴ社製のアッベ屈折率計を用いて平均屈折率を測定し、得られた位相差値から屈折率nx、ny、nzを算出した。
(3)斜め方向の反射特性
実施例および比較例で得られた光学補償層付偏光板の特性を用いて、シミュレーションした。正面方向(極角0°)および斜め方向(極角60°)について評価した。シミュレーションには、シンテック社製、「LCD MASTER Ver.6.084」を用いた。LCD Masterの拡張機能を使用して、反射特性のシミュレーションを行った。より詳細には、正面反射強度、正面反射色相、斜め反射強度および斜め色相の評価を行った。斜め反射強度は極角60°、方位角45°、135°、225°および315°の4点の平均値を評価した。正面反射色相はニュートラルポイントからのΔu‘v’(ニュートラル)、斜め色相は極角60°、方位角0°~360°におけるカラーシフトΔu‘v’を評価した。
(i)第1の光学補償層の作製
(i-1)ポリアリレートの合成
撹拌装置を備えた反応容器中で、2,2-ビス(4-ヒドロキシフェニル)-4-メチルペンタン27.0kgおよびテトラブチルアンモニウムクロライド0.8kgを、水酸化ナトリウム溶液250Lに溶解させた。この溶液に、テレフタル酸クロライド13.5kgとイソフタル酸クロライド6.30kgを300Lのトルエンに溶解させた溶液を撹拌しながら一度に加え、室温で90分間撹拌して、重縮合溶液とした。その後、前記重縮合溶液を静置分離してポリアリレートを含んだトルエン溶液を分離した。ついで、前記分離液を、酢酸水で洗浄し、さらにイオン交換水で洗浄した後、メタノールに投入してポリアリレートを析出させた。析出したポリアリレートを濾過し、減圧下で乾燥させることで、白色のポリアリレート34.1kg(収率92%)を得た。前記ポリアリレートの前記複屈折率(Δnxz)は、0.012であった。
上記で得られたポリアリレート10kgをトルエン73kgに溶解させ、塗工液を調製した。その後、当該塗工液を、収縮性フィルム(縦一軸延伸ポリプロピレンフィルム、東京インキ(株)製、商品名「ノーブレン」)の上に直接塗工し、その塗膜を乾燥温度60℃で5分間、80℃で5分間乾燥させ、収縮性フィルム/複屈折層の積層体を形成した。得られた積層体を、同時2軸延伸機を用いて、延伸温度155℃でMD方向に収縮倍率0.70、TD方向に1.15倍延伸することで収縮性フィルム上に位相差フィルムを形成した。ついで、当該位相差フィルムを収縮性フィルムから剥離した。位相差フィルムの厚みは15.0μm、Re(550)=272nm、Nz=0.25であった。この位相差フィルムを第1の光学補償層とした。
上記(i-1)で得られたポリアリレート10kgをトルエン73kgに溶解させ、塗工液を調製した。その後、当該塗工液を、収縮性フィルム(縦一軸延伸ポリプロピレンフィルム、東京インキ(株)製、商品名「ノーブレン」)の上に直接塗工し、その塗膜を乾燥温度60℃で5分間、80℃で5分間乾燥させ、収縮性フィルム/複屈折層の積層体を形成した。得られた積層体を、同時2軸延伸機を用いて、延伸温度155℃でMD方向に収縮倍率0.80、TD方向に1.17倍延伸することで収縮性フィルム上に位相差フィルムを形成した。ついで、当該位相差フィルムを収縮性フィルムから剥離した。位相差フィルムの厚みは17μm、Re(550)=240nm、Nz=0.50であった。この位相差フィルムを第2の光学補償層とした。
上記(i-1)で得られたポリアリレート10kgをトルエン73kgに溶解させ、塗工液を調製した。その後、当該塗工液を、収縮性フィルム(縦一軸延伸ポリプロピレンフィルム、東京インキ(株)製、商品名「ノーブレン」)の上に直接塗工し、その塗膜を乾燥温度60℃で5分間、80℃で5分間乾燥させ、収縮性フィルム/複屈折層の積層体を形成した。得られた積層体を、同時2軸延伸機を用いて、延伸温度155℃でMD方向に収縮倍率0.81、TD方向に1.15倍延伸することで収縮性フィルム上に位相差フィルムを形成した。ついで、当該位相差フィルムを収縮性フィルムから剥離した。位相差フィルムの厚みは8μm、Re(550)=120nm、Nz=0.50であった。この位相差フィルムを第3の光学補償層とした。
厚み30μmのポリビニルアルコール(PVA)系樹脂フィルム(クラレ製、製品名「PE3000」)の長尺ロールを、ロール延伸機により長手方向に5.9倍になるように長手方向に一軸延伸しながら同時に膨潤、染色、架橋、洗浄処理を施し、最後に乾燥処理を施すことにより厚み12μmの偏光子を作製した。
具体的には、膨潤処理は20℃の純水で処理しながら2.2倍に延伸した。次いで、染色処理は得られる偏光子の単体透過率が45.0%になるようにヨウ素濃度が調整されたヨウ素とヨウ化カリウムの重量比が1:7である30℃の水溶液中において処理しながら1.4倍に延伸した。更に、架橋処理は、2段階の架橋処理を採用し、1段階目の架橋処理は40℃のホウ酸とヨウ化カリウムを溶解した水溶液において処理しながら1.2倍に延伸した。1段階目の架橋処理の水溶液のホウ酸含有量は5.0重量%で、ヨウ化カリウム含有量は3.0重量%とした。2段階目の架橋処理は65℃のホウ酸とヨウ化カリウムを溶解した水溶液において処理しながら1.6倍に延伸した。2段階目の架橋処理の水溶液のホウ酸含有量は4.3重量%で、ヨウ化カリウム含有量は5.0重量%とした。また、洗浄処理は、20℃のヨウ化カリウム水溶液で処理した。洗浄処理の水溶液のヨウ化カリウム含有量は2.6重量%とした。最後に、乾燥処理は70℃で5分間乾燥させて偏光子を得た。
上記偏光子の片側に、ポリビニルアルコール系接着剤を介して、TACフィルムの片面にハードコート処理により形成されたハードコート(HC)層を有するHC-TACフィルム(厚み:32μm、保護層に対応する)をロールツーロールにより貼り合わせ、保護層/偏光子の構成を有する長尺状の偏光板を得た。
上記で得られた偏光板、第1の光学補償層、第2の光学補償層および第3の光学補償層を所定のサイズに裁断し、偏光板の偏光子面と第1の光学補償層とをアクリル系粘着剤を介して貼り合わせ、さらに、第2の光学補償層および第3の光学補償層をそれぞれアクリル系粘着剤を介してこの順に貼り合わせた。このようにして、保護層/偏光子/第1の光学補償層/第2の光学補償層/第3の光学補償層の構成を有する光学補償層付偏光板を得た。なお、第1の光学補償層の裁断は、光学補償層付偏光板において偏光子の吸収軸と第1の光学補償層の遅相軸とが実質的に直交するように行い;第2の光学補償層の裁断は、偏光子の吸収軸と第2の光学補償層の遅相軸とのなす角度が75°となるように行い;第3の光学補償層の裁断は、偏光子の吸収軸と第3の光学補償層の遅相軸とのなす角度が15°となるように行った。
得られた光学補償層付偏光板の第3の光学補償層側にアクリル系粘着剤で粘着剤層を形成した。
三星無線社製のスマートフォン(Galaxy-S5)を分解して有機ELパネルを取り出した。この有機ELパネルに貼り付けられている偏光フィルムを剥がし取り、かわりに、上記で切り出した光学補償層付偏光板を貼り合わせて有機ELパネルを得た。
偏光子の吸収軸と第2の光学補償層の遅相軸とが15°となるように、かつ、偏光子の吸収軸と第3の光学補償層の遅相軸とが75°となるように積層したこと以外は実施例1と同様にして、保護層/偏光子/第1の光学補償層/第2の光学補償層/第3の光学補償層の構成を有する光学補償層付偏光板を得た。さらに、この光学補償層付偏光板を用いたこと以外は実施例1と同様にして有機ELパネルを作製した。得られた光学補償層付偏光板および有機ELパネルを実施例1と同様の評価に供した。結果を表1に示す。
第1の光学補償層を積層しなかったこと以外は実施例1と同様にして、保護層/偏光子/第2の光学補償層/第3の光学補償層の構成を有する光学補償層付偏光板を得た。さらに、この光学補償層付偏光板を用いたこと以外は実施例1と同様にして有機ELパネルを作製した。得られた光学補償層付偏光板および有機ELパネルを実施例1と同様の評価に供した。結果を表1に示す。
第2の光学補償層を積層しなかったこと以外は実施例1と同様にして、保護層/偏光子/第1の光学補償層/第3の光学補償層の構成を有する光学補償層付偏光板を得た。さらに、この光学補償層付偏光板を用いたこと以外は実施例1と同様にして有機ELパネルを作製した。得られた光学補償層付偏光板および有機ELパネルを実施例1と同様の評価に供した。結果を表1に示す。
第3の光学補償層を積層しなかったこと以外は実施例1と同様にして、保護層/偏光子/第1の光学補償層/第2の光学補償層の構成を有する光学補償層付偏光板を得た。さらに、この光学補償層付偏光板を用いたこと以外は実施例1と同様にして有機ELパネルを作製した。得られた光学補償層付偏光板および有機ELパネルを実施例1と同様の評価に供した。結果を表1に示す。
表1から明らかなように、本発明の実施例の光学補償層付偏光板は、正面方向および斜め方向のいずれにおいても反射防止特性(反射強度)および反射色相のいずれもが優れている。
20 保護層
30 第1の光学補償層
40 第2の光学補償層
50 第3の光学補償層
100 光学補償層付偏光板
Claims (6)
- 偏光子と第1の光学補償層と第2の光学補償層と第3の光学補償層とを備え、
該第1の光学補償層、該第2の光学補償層および該第3の光学補償層がいずれも、nx>nz>nyの屈折率特性を示し、
有機ELパネルに用いられる、
光学補償層付偏光板。 - 前記第1の光学補償層、前記第2の光学補償層および前記第3の光学補償層がいずれも、Re(450)≧Re(550)の関係を満たす、請求項1に記載の光学補償層付偏光板:
ここで、Re(450)およびRe(550)は、それぞれ、23℃における波長450nmおよび550nmの光で測定した面内位相差を表す。 - 前記第1の光学補償層のRe(550)が230nm~310nmであり、および、Nz係数が0.1~0.4であり、前記偏光子の吸収軸と該第1の光学補償層の遅相軸とが実質的に直交している、請求項1または2に記載の光学補償層付偏光板。
- 前記第2の光学補償層のRe(550)が210nm~270nmであり、および、Nz係数が0.3~0.7であり、前記偏光子の吸収軸と該第2の光学補償層の遅相軸とのなす角度が5°~25°、65°~85°、95°~115°、または155°~175°である、請求項1から3のいずれかに記載の光学補償層付偏光板。
- 前記第3の光学補償層のRe(550)が80nm~160nmであり、および、Nz係数が0.3~0.7であり、前記偏光子の吸収軸と該第3の光学補償層の遅相軸とのなす角度が5°~25°、65°~85°、95°~115°、または155°~175°である、請求項1から4のいずれかに記載の光学補償層付偏光板。
- 請求項1から5のいずれかに記載の光学補償層付偏光板を備える、有機ELパネル。
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