CN117908178A - Polarizing plate with retardation layer and image display device - Google Patents
Polarizing plate with retardation layer and image display device Download PDFInfo
- Publication number
- CN117908178A CN117908178A CN202410253808.4A CN202410253808A CN117908178A CN 117908178 A CN117908178 A CN 117908178A CN 202410253808 A CN202410253808 A CN 202410253808A CN 117908178 A CN117908178 A CN 117908178A
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- layer
- retardation
- retardation layer
- film
- polarizing plate
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- 229910001845 yogo sapphire Inorganic materials 0.000 description 1
- 229910052726 zirconium Inorganic materials 0.000 description 1
Classifications
-
- 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
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/13363—Birefringent elements, e.g. for optical compensation
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
- G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B33/00—Electroluminescent light sources
- H05B33/02—Details
- H05B33/04—Sealing arrangements, e.g. against humidity
-
- 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
-
- 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
Abstract
The invention provides a polarizing plate with a phase difference layer, which can realize a liquid crystal display device with excellent visibility when being seen through an optical member with a polarizing effect. The polarizing plate with a retardation layer of the present invention is an elongated polarizing plate comprising a retardation layer, a polarizer, and an adhesive layer in this order. The in-plane retardation Re (550) of the retardation layer is 100-180 nm, the relationship of Re (450) < Re (550) < Re (650) is satisfied, and the refractive index ellipsoid of the retardation layer shows a relationship of nx > Nz > ny, and the Nz coefficient is 0.2-0.8.
Description
The application relates to a Chinese national application number 201680070082.4 filed 11/18 in 2016, and the application is a divisional application of an application patent application with the name of a polarizing plate with a phase difference layer and an image display device.
Technical Field
The present invention relates to a polarizing plate with a retardation layer and an image display device using the polarizing plate with the retardation layer.
Background
In recent years, the opportunities for image display devices to be used under strong external light have increased, such as mobile phones, smart phones, tablet Personal Computers (PCs), car navigation systems, digital signage, window displays, and the like. When the image display device is used outdoors as described above, when a viewer wears the polarized sunglasses to observe the image display device, the transmission axis direction of the polarized sunglasses and the transmission axis direction of the exit side of the image display device may be in a crossed nicols state according to the angle of the viewer's observation, and as a result, the screen may be blackened, and the image may not be displayed visually. In order to solve such a problem, a technique of disposing a λ/4 plate or an ultra-high retardation film on the visible side of an image display device has been proposed. However, there is room for improvement in terms of visibility when a viewer wears polarized sunglasses to observe an image display device.
Prior art literature
Patent literature
Patent document 1: japanese patent laid-open No. 2005-352068
Patent document 2: japanese patent application laid-open No. 2011-107198
Disclosure of Invention
Technical problem to be solved by the invention
The present invention has been made to solve the above-described conventional problems, and an object of the present invention is to provide a polarizing plate with a retardation layer for a liquid crystal display device, which can realize excellent visibility when viewed through an optical member having a polarizing effect.
Means for solving the technical problems
The polarizing plate with a retardation layer of the present invention is an elongated polarizing plate comprising a retardation layer, a polarizer, and an adhesive layer in this order. The in-plane retardation Re (550) of the retardation layer is 100-180 nm, the relationship of Re (450) < Re (550) < Re (650) is satisfied, and the refractive index ellipsoid of the retardation layer shows a relationship of nx > Nz > ny, and the Nz coefficient is 0.2-0.8.
In one embodiment, an angle formed between a slow axis of the retardation layer and an absorption axis of the polarizer is 125 ° to 145 °.
In one embodiment, the polarizing plate with a retardation layer further includes a separate retardation layer between the polarizer and the adhesive layer. The in-plane retardation Re (550) of the additional retardation layer is 100nm to 180nm, and the refractive index ellipsoid of the additional retardation layer shows a relationship of nx > ny.gtoreq.nz. In one embodiment, the slow axis of the retardation layer is substantially orthogonal to the slow axis of the other retardation layer.
In one embodiment, the in-plane retardation Re (550) of the additional retardation layer is 150nm to 350nm, and the refractive index ellipsoid of the additional retardation layer shows a relationship of nx > nz > ny. In one embodiment, the angle between the slow axis of the retardation layer and the slow axis of the other retardation layer is 35 ° to 55 °.
In one embodiment, the in-plane retardation of the additional retardation layer satisfies the relationship of Re (450) < Re (550) < Re (650).
In one embodiment, the polarizing plate with a retardation layer is temporarily bonded with a spacer on the outer side of the adhesive layer.
In one embodiment, the polarizing plate with a retardation layer is in a roll shape.
According to another aspect of the present invention, there is provided an image display apparatus. The image display device includes the sheared polarizing plate with the retardation layer on the visible side, and the retardation layer of the polarizing plate with the retardation layer is arranged on the visible side.
In one embodiment, the image display device is a liquid crystal display device or an organic electroluminescent display device having a backlight source with a discontinuous light emission spectrum.
Effects of the invention
According to the embodiment of the present invention, by disposing the retardation layer having specific wavelength dispersion characteristics, in-plane retardation, refractive index ellipsoids, and Nz coefficients so as to be the visible side of the polarizer, it is possible to obtain a polarizing plate with a retardation layer that can realize a liquid crystal display device excellent in visibility when viewed through an optical member having a polarizing effect.
Drawings
Fig. 1 is a schematic cross-sectional view of a polarizing plate with a retardation layer according to an embodiment of the present invention.
Fig. 2 is a schematic cross-sectional view of a polarizing plate with a retardation layer according to another embodiment of the present invention.
Fig. 3 is a view schematically showing an example of the light emission spectrum of a backlight light source that can be used in a liquid crystal display device according to an embodiment of the present invention.
Fig. 4 is a diagram schematically showing an example of the emission spectrum of a conventional backlight light source.
Detailed Description
Hereinafter, representative embodiments of the present invention will be described, but the present invention is not limited to these embodiments.
(Definition of terms and symbols)
The definitions of terms and symbols in the present specification are as follows.
(1) Refractive index (nx, ny, nz)
"Nx" is a refractive index in a direction in which the in-plane refractive index becomes maximum (i.e., the slow axis direction), "ny" is a refractive index in a direction orthogonal to the slow axis (i.e., the fast axis direction), and "nz" is a refractive index in the thickness direction.
(2) In-plane phase difference (Re)
"Re (λ)" is the in-plane retardation of a film measured at 23℃by light having a wavelength of λnm. For example, "Re (450)" is the in-plane retardation of a film measured at 23℃by light having a wavelength of 450 nm. When the film thickness is d (nm), re (λ) is represented by the formula: re= (nx-ny) x d.
(3) Retardation in thickness direction (Rth)
"Rth (lambda)" is the retardation in the thickness direction of the film measured at 23℃by light having a wavelength of 550 nm. For example, "Rth (450)" is a retardation in the thickness direction of a film measured at 23℃by light having a wavelength of 450 nm. When the film thickness is d (nm), rth (λ) is represented by the formula: rth= (nx-nz) ×d.
(4) Nz coefficient
The Nz coefficient is obtained by nz=rth/Re.
(5)nx＝ny、nx＝nz、ny＝nz
The term nx=ny includes not only the case where nx is identical to ny but also the case where nx is substantially identical to ny. The same applies to the relationship of nx=nz and ny=nz.
(6) Substantially orthogonal or parallel
The expressions "substantially orthogonal" and "substantially orthogonal" include the case where the angle formed by 2 directions is 90 ° ± 10 °, preferably 90 ° ± 7 °, further preferably 90 ° ± 5 °. The expression "substantially parallel" and "substantially parallel" includes the case where the angle made by 2 directions is 0°±10°, preferably 0°±7°, and more preferably 0°±5°. Further, when abbreviated as "orthogonal" or "parallel," may also include a substantially orthogonal or substantially parallel state.
(7) Angle of
In the present specification, the term "angle" includes angles in both the clockwise and counterclockwise directions unless explicitly stated otherwise.
(8) Strip-shaped
The term "elongated" refers to an elongated shape having a length sufficiently long with respect to the width, and includes, for example, an elongated shape having a length of 10 times or more, preferably 20 times or more, with respect to the width.
(9) Roll-to-roll
The term "roll-to-roll" refers to a method in which roll-shaped films are attached to each other while being conveyed so that the longitudinal directions of the films are aligned with each other.
A. Polarizing plate with phase difference layer
A-1 integral Structure of polarizing plate with retardation layer
Fig. 1 is a schematic cross-sectional view of a polarizing plate with a retardation layer according to an embodiment of the present invention. In the drawings, the ratio of the thicknesses of the respective layers is different from that of reality for easy observation. The polarizing plate 100 with a retardation layer of the present embodiment includes, in order, a retardation layer 10, a polarizer 20, and an adhesive layer 30. In the embodiment of the present invention, the in-plane retardation Re (550) of the retardation layer 10 is 100nm to 180nm, preferably 110nm to 170nm, more preferably 120nm to 160nm, particularly preferably 135nm to 155nm. Further, the retardation layer 10 satisfies the relationship of Re (450) < Re (550) < Re (650). The refractive index ellipsoid of the retardation layer 10 exhibits a relationship of nx > Nz > ny, and the Nz coefficient is 0.2 to 0.8, preferably 0.3 to 0.7, more preferably 0.4 to 0.6, and still more preferably about 0.5. The angle between the slow axis of the retardation layer 10 and the absorption axis of the polarizer 20 is preferably 125 ° to 145 °, more preferably 128 ° to 142 °, further preferably 130 ° to 140 °, particularly preferably 132 ° to 138 °, particularly preferably 134 ° to 136 °, and most preferably about 135 °.
Fig. 2 is a schematic cross-sectional view of a polarizing plate with a retardation layer according to another embodiment of the present invention. The polarizing plate 101 with a retardation layer of the present embodiment further includes another retardation layer 50 between the polarizer 20 and the adhesive layer 30. Hereinafter, for convenience, the phase difference layer 10 may be referred to as a 1 st phase difference layer, and the other phase difference layer 50 may be referred to as a2 nd phase difference layer. The in-plane retardation Re (550) of the 2 nd retardation layer 50 is preferably 100nm to 180nm, more preferably 110nm to 170nm, still more preferably 120nm to 160nm, particularly preferably 135nm to 155nm. Further, the 2 nd retardation layer 50 preferably satisfies the relationship of Re (450) < Re (550) < Re (650). In addition, the refractive index ellipsoid of the 2 nd retardation layer 50 preferably shows a relationship of nx > ny. Gtoreq.nz.
The in-plane retardation Re (550) of the 2 nd retardation layer 50 may also be preferably 150nm to 350nm. In this case, the refractive index ellipsoid of the 2 nd retardation layer preferably shows a relationship of nx > nz > ny. The in-plane retardation Re (550) of the 2 nd retardation layer 50 is more preferably 180nm to 320nm, still more preferably 240nm to 300nm. In this case, the 2 nd retardation layer also preferably satisfies the relationship of Re (450) < Re (550) < Re (650).
In one embodiment, the slow axis of the 1 st phase difference layer 10 is substantially orthogonal to the slow axis of the 2 nd phase difference layer 50. In this case, the angle between the slow axis of the 2 nd retardation layer 50 and the absorption axis of the polarizer 20 is preferably 35 ° to 55 °, more preferably 38 ° to 52 °, further preferably 40 ° to 50 °, particularly preferably 42 ° to 48 °, particularly preferably 44 ° to 46 °, and most preferably about 45 °. In this case, the in-plane retardation Re (550) of the 2 nd retardation layer is preferably 100nm to 180nm, and preferably satisfies the relationship of Re (450) < Re (550) < Re (650), and the refractive index ellipsoids preferably show a relationship of nx > ny. Gtoreq.nz. With such a configuration, the polarizing plate with the retardation layer can function well as an antireflection film of an organic EL (Electroluminescence) display device. In another embodiment, the angle between the slow axis of the 1 st retardation layer 10 and the slow axis of the 2 nd retardation layer 50 is preferably 35 ° to 55 °, more preferably 38 ° to 52 °, further preferably 40 ° to 50 °, particularly preferably 42 ° to 48 °, particularly preferably 44 ° to 46 °, and most preferably about 45 °. In this case, the slow axis of the 2 nd phase difference layer 50 is substantially orthogonal to the absorption axis of the polarizer 20. In this case, the in-plane retardation Re (550) of the 2 nd retardation layer is preferably 150nm to 350nm, and preferably satisfies the relationship of Re (450) < Re (550) < Re (650), and the refractive index ellipsoids preferably exhibit the relationship of nx > nz > ny. With such a configuration, the polarizing plate with the retardation layer can widen the viewing angle of the liquid crystal display device.
Although not clearly shown in the drawings, the polarizing plate with a retardation layer according to the embodiment of the present invention is in the form of a long strip. Therefore, the components of the polarizing plate with the retardation layer (for example, the polarizer, the 1 st retardation layer, and the 2 nd retardation layer) are also elongated. Typically, the polarizer has an absorption axis in the elongated direction. Therefore, the 1 st phase difference layer and the 2 nd phase difference layer may each have a slow axis so as to form the predetermined angle with respect to the longitudinal direction (i.e., in the oblique direction). In one embodiment, the polarizing plate with the retardation layer is wound into a roll. The polarizing plate with a retardation layer can be produced by laminating, for example, an elongated retardation film constituting the 1 st retardation layer 10, an elongated polarizer 20, and, if necessary, an elongated retardation film constituting the 2 nd retardation layer 50 by roll-to-roll.
A protective film (not shown) may be provided between the polarizer 20 and the 1 st retardation layer 10 and/or between the polarizer 20 and the adhesive layer 30 (the 2 nd retardation layer 50 if present), as needed. The protective film is of course also elongated.
A conductive layer (not shown) may be provided between the polarizer 20 (the 2 nd retardation layer 50 if present) and the adhesive layer 30 as needed. By providing the conductive layer, the image display device using the polarizing plate with the phase difference layer can constitute a so-called in-cell touch panel type input display device in which a touch sensor is interposed between a display unit (e.g., a liquid crystal cell, an organic EL unit) and a polarizer.
In actual use, the spacer 40 is temporarily bonded to the outside of the adhesive layer 30, the adhesive layer can be protected during the period before the polarizing plate with the retardation layer is supplied to use, and a roll can be formed.
Hereinafter, each layer of the polarizing plate with a retardation layer will be described.
A-2. 1 st phase difference layer
As described above, the in-plane retardation Re (550) of the 1 st retardation layer 10 is 100nm to 180nm, preferably 110nm to 170nm, more preferably 120nm to 160nm, particularly preferably 135nm to 155nm. That is, the 1 st retardation layer can function as a so-called λ/4 plate. Further, the 1 st retardation layer (when the polarizing plate with the retardation layer is applied to an image display device, the polarizing plate is visible side) is disposed on the side of the polarizer opposite to the pressure-sensitive adhesive layer. Therefore, the 1 st phase difference layer has a function of converting linearly polarized light emitted from the polarizer to the visible side into elliptically polarized light or circularly polarized light. As described above, by disposing the 1 st retardation layer that can function as a λ/4 plate in the above-described specific axial relationship on the visible side of the polarizer, an image display device having excellent visibility can be realized even when the display screen is visible through an optical member having a polarizing function (for example, polarized sunglasses). Therefore, the image display device using the polarizing plate with a retardation layer of the present invention can be preferably used outdoors.
Further, as described above, the 1 st retardation layer satisfies the relationship of Re (450) < Re (550) < Re (650). That is, the 1 st phase difference layer shows a wavelength dependence of inverse dispersion in which the phase difference value increases according to the wavelength of the measurement light. Re (450)/Re (550) of the 1 st retardation layer is preferably 0.8 or more and less than 1.0, more preferably 0.8 to 0.95.Re (550)/Re (650) is preferably 0.8 or more and less than 1.0, more preferably 0.8 to 0.97.
As described above, the refractive index ellipsoid of the 1 st retardation layer shows a relationship of nx > nz > ny and has a slow axis. As described above, the angle between the slow axis of the 1 st retardation layer 10 and the absorption axis of the 1 st polarizer 20 is preferably 125 ° to 145 °, more preferably 128 ° to 142 °, further preferably 130 ° to 140 °, particularly preferably 132 ° to 138 °, particularly preferably 134 ° to 136 °, and most preferably about 135 °. When the angle is within such a range, a very excellent circularly polarized light characteristic (as a result, a very excellent antireflection characteristic) can be achieved by setting the 1 st phase difference layer to a λ/4 plate.
The Nz coefficient of the 1 st retardation layer is preferably 0.2 to 0.8, more preferably 0.3 to 0.7, still more preferably 0.4 to 0.6, and particularly preferably about 0.5. By satisfying such a relationship, in an image display device to which a polarizing plate with a retardation layer is applied, there is an advantage in that coloring in the case of viewing from an oblique direction through an optical member having a polarizing effect (for example, polarized sunglasses) is suppressed.
The 1 st retardation layer contains a resin having an absolute value of photoelastic coefficient of preferably 2×10 -11m2/N or less, more preferably 2.0×10 -13m2/N～1.5×10-11m2/N, still more preferably 1.0×10 -12m2/N～1.2×10-11m2/N. When the absolute value of the photoelastic coefficient is in such a range, it is difficult to generate a change in the phase difference when a shrinkage stress occurs during heating. As a result, heat unevenness of the image display device using the polarizing plate with the retardation layer can be favorably prevented.
The thickness of the 1 st retardation layer can be set so that the layer can function as a lambda/4 plate most appropriately. In other words, the thickness can be set in such a manner that a desired in-plane retardation is obtained. Specifically, the thickness is preferably 1 μm to 80. Mu.m, more preferably 10 μm to 80. Mu.m, still more preferably 10 μm to 60. Mu.m, particularly preferably 30 μm to 50. Mu.m.
The 1 st retardation layer is formed of any appropriate resin that can satisfy the above-described characteristics. Examples of the resin forming the 1 st retardation layer include polycarbonate resins, polyvinyl acetal resins, cycloolefin resins, acrylic resins, cellulose ester resins, and the like. Preferably a polycarbonate resin.
As the polycarbonate resin, any suitable polycarbonate resin may be used as long as the effects of the present invention can be obtained. Preferred polycarbonate resins comprise: structural units derived from a fluorene-based dihydroxy compound, structural units derived from an isosorbide-based dihydroxy compound, and structural units derived from at least 1 dihydroxy compound selected from the group consisting of alicyclic diols, alicyclic dimethanol, diethylene glycol, triethylene glycol or polyethylene glycol, and alkylene glycol or spiroglycol. Preferred polycarbonate resins comprise: structural units derived from fluorene-based dihydroxy compounds, structural units derived from isosorbide-based dihydroxy compounds, structural units derived from alicyclic dimethanol, and/or structural units derived from diethylene glycol, triethylene glycol, or polyethylene glycol; further preferably comprises: structural units derived from fluorene-based dihydroxy compounds, structural units derived from isosorbide-based dihydroxy compounds, and structural units 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 the polycarbonate resin which can be preferably used in the present invention are described in, for example, japanese patent application laid-open No. 2014-10291 and Japanese patent application laid-open No. 2014-2666, and the descriptions are incorporated herein by reference.
The glass transition temperature of the polycarbonate resin is preferably 110 ℃ or more and 250 ℃ or less, more preferably 120 ℃ or more and 230 ℃ or less. If the glass transition temperature is too low, heat resistance tends to be poor, dimensional change may occur after film formation, and the image quality of the obtained liquid crystal display device may be degraded. If the glass transition temperature is too high, the film may have poor molding stability during film molding, and the transparency of the film may be impaired. The glass transition temperature was determined in accordance with JIS K7121 (1987).
The molecular weight of the polycarbonate resin may be expressed by reduced viscosity. Reduced viscosity was determined using a Ubbelohde viscosity tube at a temperature of 20.0deg.C.+ -. 0.1 ℃ using methylene chloride as a solvent to precisely prepare a polycarbonate concentration of 0.6 g/dL. The lower limit of the reduced viscosity is usually preferably 0.30dL/g, more preferably 0.35dL/g or more. The upper limit of the reduced viscosity is usually preferably 1.20dL/g, more preferably 1.00dL/g, and further preferably 0.80dL/g. If the reduced viscosity is less than the lower limit, there is a problem that the mechanical strength of the molded article is reduced. On the other hand, if the reduced viscosity exceeds the upper limit, there may be a problem that fluidity at the time of molding is lowered, and productivity or moldability is lowered.
The retardation film constituting the 1 st retardation layer can be obtained, for example, by stretching a film made of the polycarbonate resin. As a method for forming a film from a polycarbonate resin, any suitable molding method can be used. Specific examples thereof include compression molding, transfer molding, injection molding, extrusion molding, blow molding, powder molding, FRP (FiberReinforcedPlastics, fiber reinforced plastic) molding, casting (e.g., casting), calendaring, and hot pressing. Extrusion molding or cast coating is preferred. The reason is that the smoothness of the obtained film can be improved, and good optical uniformity can be obtained. The molding conditions may be appropriately set according to the composition or type of the resin used, the desired properties of the retardation film, and the like.
The thickness of the resin film (unstretched film) may be set to any appropriate value according to the desired thickness, desired optical characteristics, stretching conditions described below, and the like of the obtained retardation film. Preferably 50 μm to 300. Mu.m.
The stretching may be performed by any suitable stretching method or stretching conditions (e.g., stretching temperature, stretching ratio, stretching direction). Specifically, various stretching methods such as free end stretching, fixed end stretching, free end shrinkage, fixed end shrinkage, and the like may be used alone, or may be used simultaneously or stepwise. The stretching direction may be performed in various directions or dimensions such as a longitudinal direction, a width direction, a thickness direction, and an oblique direction.
By appropriately selecting the stretching method and the stretching conditions, a retardation film having the desired optical characteristics (for example, refractive index characteristics, in-plane retardation, nz coefficient) can be obtained.
In one embodiment, the retardation film can be produced by continuously stretching a long resin film at a predetermined angle with respect to the longitudinal direction. By using oblique stretching, a long stretched film having an orientation angle (having a slow axis in a direction of a predetermined angle) of a predetermined angle with respect to the longitudinal direction of the film can be obtained, and for example, roll-to-roll can be realized when stacked with a polarizer, and the manufacturing process can be simplified. The predetermined angle may be an angle between the absorption axis of the polarizer (i.e., the longitudinal direction of the long film) and the slow axis of the 1 st retardation layer. As described above, the angle is preferably 125 ° to 145 °, more preferably 128 ° to 142 °, further preferably 130 ° to 140 °, particularly preferably 132 ° to 138 °, particularly preferably 134 ° to 136 °, and most preferably about 135 °.
Examples of the stretching machine used for oblique stretching include a tenter type stretching machine capable of imparting a feeding force or a stretching force or a pulling force at different speeds in the lateral direction and/or the longitudinal direction. Examples of the tenter type stretching machine include a transverse uniaxial stretching machine and a simultaneous biaxial stretching machine, and any suitable stretching machine may be used as long as the long resin film can be continuously and obliquely stretched.
In the stretching machine, by appropriately controlling the left and right speeds, a retardation film (substantially long retardation film) having the desired in-plane retardation and having a slow axis in the desired direction can be obtained.
Examples of the method of the oblique stretching include those described in Japanese patent application laid-open No. Sho 50-83482, japanese patent application laid-open No. Hei 2-113920, japanese patent application laid-open No. Hei 3-182701, japanese patent application laid-open No. 2000-9912, japanese patent application laid-open No. 2002-86554, and Japanese patent application laid-open No. 2002-22944.
The retardation film (i.e., a retardation film having an Nz coefficient of less than 1.0) that can be preferably used in the embodiment of the present invention can be produced by laminating a heat shrinkable film on one or both surfaces of a resin film via, for example, an acrylic adhesive to form a laminate, and stretching the laminate as described above. By adjusting the constitution (for example, shrinkage force) and stretching conditions (for example, stretching temperature) of the heat-shrinkable film, a retardation film having a desired Nz coefficient can be obtained.
The stretching temperature of the film may vary depending on the desired in-plane phase difference value and thickness of the retardation film, the kind of resin used, the thickness of the film used, the stretching ratio, and the like. Specifically, the stretching temperature is preferably from Tg to 30℃to Tg+30℃, more preferably from Tg to 15℃to Tg+15℃, and most preferably from Tg to 10℃to Tg+10℃. By stretching at such a temperature, a retardation film having appropriate characteristics can be obtained in the present invention. In addition, tg is the glass transition temperature of the constituent material of the film.
As the polycarbonate resin film, a commercially available film can be used. Specific examples of the commercial products include "PURE-ACE WR-S", "PURE-ACE WR-W", "PURE-ACE WR-M", and "NRF" manufactured by Nito electric Co., ltd. The film may be used as it is, or may be used after 2 treatments (e.g., stretching treatment, surface treatment) are performed on the film according to the purpose.
A-3 polarizer
As the polarizer, any suitable polarizer may be used. 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 composed of a single-layer resin film include a film obtained by dyeing and stretching 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 with a dichroic substance such as iodine or a dichroic dye, a polyvinyl alignment film such as a dehydrated PVA product or a desalted polyvinyl chloride product, and the like. From the viewpoint of excellent optical characteristics, a polarizer obtained by dyeing a PVA-based film with iodine and uniaxially stretching the film is preferably used.
The dyeing with iodine can be performed, for example, by immersing the PVA-based film in an aqueous iodine solution. The stretching ratio of the uniaxial stretching is preferably 3 to 7 times. Stretching may be performed after dyeing treatment or may be performed while dyeing. In addition, dyeing may be performed after stretching. The PVA-based film may be subjected to swelling treatment, crosslinking treatment, washing treatment, drying treatment, and the like as needed. For example, by immersing the PVA-based film in water and washing it with water before dyeing, not only stains or anti-blocking agents on the surface of the PVA-based film can be washed away, but also the PVA-based film can be swelled to prevent uneven dyeing.
Specific examples of the polarizer obtained by using the laminate include a laminate of a resin substrate and a PVA-based resin layer (PVA-based resin film) laminated on the resin substrate, and a polarizer obtained by coating a laminate of a resin substrate and a PVA-based resin layer formed on the resin substrate. A polarizer obtained by using a laminate of a resin substrate and a PVA-based resin layer formed on the resin substrate can be produced, for example, by: coating a PVA-based resin solution on a resin substrate, drying the resin substrate to form a PVA-based resin layer on the resin substrate, and obtaining a laminate of the resin substrate and the PVA-based resin layer; the laminate was stretched and dyed to prepare a polarizer from the PVA-based resin layer. In the present embodiment, stretching typically includes immersing the laminate in an aqueous boric acid solution to perform stretching. Further, stretching may further include, if necessary, subjecting the laminate to air stretching at a high temperature (for example, 95 ℃ or higher) before stretching in an aqueous boric acid solution. The obtained laminate of the resin substrate and the polarizer may be used as it is (that is, the resin substrate may be used as a protective layer for the polarizer), or the resin substrate may be peeled off from the laminate of the resin substrate and the polarizer and any appropriate protective layer according to the purpose may be laminated on the peeled surface. Details of such a method for producing a polarizer are described in, for example, japanese patent application laid-open No. 2012-73580. The entire disclosure of this publication is incorporated by reference into this specification.
The thickness of the polarizer is preferably 15 μm or less, more preferably 1 μm to 12 μm, still more preferably 3 μm to 10 μm, particularly preferably 3 μm to 8 μm. When the thickness of the polarizer is in such a range, curling at the time of heating can be satisfactorily suppressed, and excellent durability of appearance at the time of heating can be obtained. Further, if the thickness of the polarizer is in such a range, the image display device can be thinned.
The polarizer preferably exhibits absorption dichroism at any one of wavelengths 380nm to 780 nm. The monomer transmittance of the polarizer is preferably 43.0% 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.
As described above, the protective film may be disposed on one side or both sides of the polarizer. The protective film is formed of any suitable film. Specific examples of the material that is the main component of the film include cellulose resins such as triacetyl cellulose (TAC), transparent resins such as polyester resins, polyvinyl alcohol resins, polycarbonate resins, polyamide resins, polyimide resins, polyether sulfone resins, polysulfone resins, polystyrene resins, polynorbornene resins, polyolefin resins, (meth) acrylic resins, and acetate resins. Further, a thermosetting resin such as a (meth) acrylic resin, a urethane resin, a (meth) acrylic urethane resin, an epoxy resin, or a silicone resin, an ultraviolet curable resin, or the like can be mentioned. Further, for example, a vitreous polymer such as a siloxane polymer can be used. Furthermore, a polymer film described in Japanese patent application laid-open No. 2001-343529 (WO 01/37007) 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, and for example, a resin composition having an alternating copolymer containing isobutylene and N-methylmaleimide and an acrylonitrile-styrene copolymer can be used. The polymer film may be, for example, an extrusion molded product of the above resin composition.
The thickness of the protective film is preferably 20 μm to 200. Mu.m, more preferably 30 μm to 100. Mu.m, still more preferably 35 μm to 95. Mu.m.
In the case where a protective film (inner protective film) is disposed on the opposite side of the polarizer from the 1 st phase difference layer, the inner protective film 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 +10nm.
A-4. 2 nd phase difference layer
As described above, the in-plane retardation Re (550) of the 2 nd retardation layer 50 is 100nm to 180nm, preferably 110nm to 170nm, more preferably 120nm to 160nm, particularly preferably 135nm to 155nm. When the in-plane retardation of the 2 nd retardation layer is in such a range, a polarizing plate with a retardation layer that can realize an image display device having excellent antireflection characteristics can be obtained by disposing the polarizing plate at the above-described specific axial angle.
Further, as described above, the 2 nd retardation layer satisfies the relationship of Re (450) < Re (550) < Re (650).
The refractive index ellipsoids of the 2 nd retardation layer as described above show a relationship of nx > ny.gtoreq.nz, and have a slow axis. In this case, as described above, the slow axis of the 1 st phase difference layer 10 is substantially orthogonal to the slow axis of the 2 nd phase difference layer 50. With such a configuration, since the dimensional changes of the 1 st phase difference layer and the 2 nd phase difference layer are symmetrical, curling and the like can be suppressed, and a polarizing plate with a phase difference layer excellent in durability can be obtained. Further, for example, in an organic EL display device, an excellent antireflection function can be achieved. The Nz coefficient of the 2 nd retardation layer is preferably 0.9 to 2, more preferably 1 to 1.5, and still more preferably 1 to 1.3.
Other characteristics, constituent materials, and the like of the 2 nd retardation layer are as described in the above item a-2 with respect to the 1 st retardation layer. The description of item A-2 above regarding the 1 st retardation layer is basically applicable to the method of forming the 2 nd retardation layer. However, the difference is that the heat shrinkable film is not used in stretching.
As described above, as the 2 nd retardation layer, a retardation film having an in-plane retardation Re (550) of 150nm to 350nm, satisfying the relationship of Re (450) < Re (550) < Re (650) and having an ellipsoid of refractive index showing a relationship of nx > nz > ny may be used. That is, the 2 nd retardation layer may have the same optical characteristics as the 1 st retardation layer, except that the in-plane retardation is different. Such a configuration has an advantage that excellent viewing angle characteristics can be achieved in, for example, a liquid crystal display device. In this case, as described above, the angle between the slow axis of the 1 st phase difference layer 10 and the slow axis of the 2 nd phase difference layer 50 is preferably 35 ° to 55 °, more preferably 38 ° to 52 °, further preferably 40 ° to 50 °, particularly preferably 42 ° to 48 °, particularly preferably 44 ° to 46 °, and most preferably about 45 °.
A-5 adhesive layer
As the adhesive constituting the adhesive layer 30, any suitable adhesive may be used. Typically, the adhesive layer is formed of an acrylic adhesive. The thickness of the adhesive layer is, for example, 10 μm to 50 μm.
A-6 conductive layer
Typically, the conductive layer is transparent (i.e., the conductive layer is a transparent conductive layer). The conductive layer may be patterned as desired. Through patterning, a conductive portion and an insulating portion can be formed. As a result, an electrode can be formed. The electrodes may function as touch sensor electrodes that sense contact with the touch panel. The shape of the pattern is preferably a pattern that operates well as a touch panel (for example, a capacitive touch panel). Specific examples thereof include patterns described in japanese patent application laid-open publication No. 2011-511357, japanese patent application laid-open publication No. 2010-164938, japanese patent application laid-open publication No. 2008-310550, japanese patent application laid-open publication No. 2003-511799, and japanese patent application laid-open publication No. 2010-541109.
The total light transmittance of the conductive layer is preferably 80% or more, more preferably 85% or more, and further preferably 90% or more. For example, when a conductive nanowire described below is used, a transparent conductive layer having an opening formed therein can be formed, and a transparent conductive layer having high light transmittance can be obtained.
The density of the conductive layer is preferably 1.0g/cm 3～10.5g/cm3, more preferably 1.3g/cm 3～3.0g/cm3.
The surface resistance value of the conductive layer is preferably 0.1 Ω/≡to 1000 Ω/≡, more preferably 0.5 Ω/≡to 500 Ω/≡, and still more preferably 1 Ω/≡to 250 Ω/≡.
Typical examples of the conductive layer include a conductive layer containing a metal oxide, a conductive layer containing conductive nanowires, and a conductive layer containing a metal mesh. Preferably a conductive layer comprising conductive nanowires or a conductive layer comprising a metal mesh. The reason is that the conductive layer is excellent in bending resistance, and is hardly lost even when bent, and thus a conductive layer which can be bent well can be formed. As a result, the polarizing plate with the retardation layer can be applied to a bendable image display device.
The conductive layer containing a metal oxide can be formed by forming a metal oxide film on any suitable substrate by any suitable film forming method (for example, vacuum evaporation, sputtering, CVD (Chemical Vapor Deposition, chemical vapor deposition), ion plating, spraying, or the like). Examples of 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. Among them, indium-tin composite oxide (ITO) is preferable.
The conductive layer containing the conductive nanowires may be formed by coating a dispersion liquid (conductive nanowire dispersion liquid) obtained by dispersing the conductive nanowires in a solvent on any appropriate substrate, and then drying the coated layer. As the conductive nanowire, any suitable conductive nanowire may be used as long as the effects of the present invention can be obtained. The conductive nanowire is a conductive substance having a needle-like or linear shape and a diameter of nanometer size. The conductive nanowires may be linear or curved. As described above, the conductive layer including the conductive nanowire is excellent in bending resistance. Further, the conductive layer including the conductive nanowires is formed into a mesh shape by forming gaps between the conductive nanowires, and even a small amount of conductive nanowires can form a good conductive path, so that a conductive layer having a small resistance can be obtained. Further, by forming the conductive nanowire into a mesh shape, an opening portion can be formed in a gap of the mesh, and a conductive layer having high light transmittance can be obtained. Examples of the conductive nanowire include a metal nanowire made of a metal, and a conductive nanowire including a carbon nanotube.
The ratio of the thickness d to the length L (aspect ratio: L/d) of the conductive nanowire is preferably 10 to 100,000, more preferably 50 to 100,000, and even more preferably 100 to 10,000. When conductive nanowires having a large aspect ratio are used, the conductive nanowires can satisfactorily cross each other, and can exhibit higher conductivity than a small amount of conductive nanowires. As a result, a conductive layer having high light transmittance can be obtained. In the present specification, the term "thickness of the conductive nanowire" refers to a diameter in the case where the cross section of the conductive nanowire is circular, a short diameter in the case where the conductive nanowire is elliptical, and a longest diagonal in the case where the conductive nanowire is polygonal. The thickness and length of the conductive nanowires can be confirmed by a scanning electron microscope or a transmission electron microscope.
The thickness of the conductive nanowire is preferably less than 500nm, more preferably less than 200nm, further preferably 1nm to 100nm, particularly preferably 1nm to 50nm. In such a range, a conductive layer having high light transmittance can be formed. The length of the conductive nanowire is preferably 2.5 μm to 1000 μm, more preferably 10 μm to 500 μm, and even more preferably 20 μm to 100 μm. When the amount is within this range, a conductive layer having high conductivity can be obtained.
As the metal constituting the conductive nanowire (metal nanowire), any suitable metal may be used as long as it is a metal having high conductivity. The metal nanowire is preferably composed of 1 or more metals selected from the group consisting of gold, platinum, silver, and copper. Among them, silver, copper or gold is preferable, and silver is more preferable from the viewpoint of conductivity. Further, a material obtained by subjecting the metal to a plating treatment (for example, gold plating treatment) may be used.
As the carbon nanotubes, any suitable carbon nanotubes may be used. For example, so-called multi-layered carbon nanotubes, two-layered carbon nanotubes, single-layered carbon nanotubes, or the like can be used. Among them, single-walled carbon nanotubes are preferably used in view of high conductivity.
As the metal mesh, any suitable metal mesh may be used as long as the effects of the present invention can be obtained. For example, a metal mesh formed in a mesh shape may be used as the pattern of the metal wiring layer provided on the film base material.
Details of the conductive nanowires and the metal mesh are described in, for example, japanese patent application laid-open No. 2014-113705 and Japanese patent application laid-open No. 2014-219667. The disclosure of this publication is incorporated by reference into the present specification.
The thickness of the conductive layer is preferably 0.01 μm to 10. Mu.m, more preferably 0.05 μm to 3. Mu.m, still more preferably 0.1 μm to 1. Mu.m. When the amount is in this range, a conductive layer excellent in conductivity and light transmittance can be obtained. In the case where the conductive layer contains a metal oxide, the thickness of the conductive layer is preferably 0.01 μm to 0.05 μm.
The conductive layer may be transferred from the substrate on which the conductive layer is formed to the polarizer (or to the inner protective film or the 2 nd retardation layer, if present) to serve as a constituent layer of the polarizing plate with the retardation layer alone, or may be laminated on the polarizer (or to the inner protective film or the 2 nd retardation layer, if present) as a laminate with the substrate (the conductive layer with the substrate) to serve as a constituent layer of the polarizing plate with the retardation layer.
B. Image display device
The polarizing plate with a retardation layer of the above item A can be cut into a predetermined size and applied to an image display device. Accordingly, the present invention includes an image display device using such a polarizing plate with a retardation layer. An image display device according to an embodiment of the present invention includes a display unit and a polarizing plate with a retardation layer cut into a predetermined size (i.e., a size corresponding to the display unit) on a visible side thereof. The polarizing plate with the retardation layer is disposed such that the 1 st retardation layer is on the visible side. As typical examples of the image display device, a liquid crystal display device and an organic EL display device are cited. In one embodiment, the image display device is a liquid crystal display device having a backlight source with a discontinuous light emission spectrum. Such a backlight light source will be described below. The entire structure of the image display device such as the liquid crystal display device and the organic EL display device can be a structure known in the art, and therefore, a detailed description thereof will be omitted.
The backlight light source is included in a backlight unit of the liquid crystal display device. As described above, the backlight light source has a discontinuous light emission spectrum. The term "having a discontinuous emission spectrum" means that distinct peaks exist in each of the wavelength regions of red (R), green (G) and blue (B), and the peaks are clearly distinguished. Fig. 3 is a view schematically showing an example of discontinuous light emission spectra. As shown in fig. 3, the light emission spectrum of the backlight light source has a peak P1 in a wavelength region (blue wavelength region) of preferably 430nm to 470nm, more preferably 440nm to 460nm, a peak P2 in a wavelength region (green wavelength region) of preferably 530nm to 570nm, more preferably 540nm to 560nm, and a peak P3 in a wavelength region (red wavelength region) of preferably 630nm to 670nm, more preferably 640nm to 660 nm. Preferably, the wavelength λ1, the height hp1 and the half-value width Δλ1 of the peak P1, the wavelength λ2, the height hp2 and the half-value width Δλ2 of the peak P2, the wavelength λ3, the height hp3 and the half-value width Δλ3 of the peak P3, the height hB1 of the valley between the peak P1 and the peak P2, and the height hB2 of the valley between the peak P2 and the peak P3 satisfy the following relational expressions (1) to (3):
(λ2-λ1)/(Δλ2+Δλ1) ＞1 (1)
(λ3-λ2)/(Δλ3+Δλ2) ＞1 (2)
0.8≤{hP2-(hB2+hB1)/2}/hP2≤1 (3)。
The ratio of (λ2- λ1)/(Δλ2+Δλ1) of the formula (1) is more preferably 1.01 to 2.00, still more preferably 1.10 to 1.50. The ratio of (λ3- λ2)/(Δλ3+Δλ2) of the formula (2) is more preferably 1.01 to 2.00, still more preferably 1.10 to 1.50. { hP2- (hB2+hB1)/2 } of the formula (3) is more preferably 0.85 to 1, still more preferably 0.9 to 1. The expression (1) indicates that the relationship between blue light and green light is independent without color mixing as a light source. The expression (2) indicates that the relationship between green light and red light is independent without color mixing as a light source. The expression (3) means that the valley between the peaks P1, P2 and P3 is low and the peaks of blue light, green light and red light are clearly distinguished. The advantages of the present invention are that the color reproducibility is improved by the predetermined formulas (1) to (3). By the synergistic effect of the backlight 300 having the light emission spectrum satisfying the formulas (1) to (3) and the 1 st phase difference layer 200, a liquid crystal display device having excellent color reproducibility, excellent visibility when viewed through an optical member having a polarizing effect, and suppressed color unevenness can be realized. For example, compared with a conventional backlight source having an emission spectrum as shown in fig. 3 (a white light source in which only LEDs emitting red light, green light, and blue light are combined), the color reproducibility, the visibility when viewed through an optical member having a polarizing effect, and the color unevenness can all be significantly improved.
The backlight light source may have any suitable configuration capable of realizing the above-described light emission spectrum. In one embodiment, the backlight source comprises a red-emitting LED, a green-emitting LED, and a blue-emitting LED, and the phosphor of the red-emitting LED is activated with tetravalent manganese ions. By activating the phosphor of the LED that emits red, the overlap of red light and green light in the light emission spectrum shown in fig. 4 can be reduced, thereby realizing the light emission spectrum shown in fig. 3. Preferable specific examples of the red phosphor activated with tetravalent manganese ions include Mn 4+ activated Mg fluorogermanate phosphors (2.5MgO.MgF 2：Mn4+) and Journal of the Electrochemical Society as exemplified in "INORGANICPHOS PHORS" p.212 (SECTION 4: PHOSPHOR DATA, 4.10Miscellaneous Oxides) published by William M.Yen AND MARVIN J.Weber CRC: M1 2M2F6：Mn4+(M1＝Li、Na、K、Rb、Cs;M2＝Si、Ge、Sn、Ti、Zr) phosphor is exemplified in SOLID-STATE SCIENCE AND TECHNOLOGY, july 1973, p 942. A backlight source using such a red phosphor is described in, for example, japanese patent application laid-open No. 2015-52648. A backlight light source of a general configuration including an LED emitting red, an LED emitting green, and an LED emitting blue is described in, for example, japanese patent application laid-open No. 2012-256014. The disclosures of these publications are incorporated by reference into this specification.
In another embodiment, a backlight light source includes a blue-emitting LED and a wavelength conversion layer including quantum dots. With such a configuration, a part of blue light emitted from the LED is converted into red light and green light by the wavelength conversion layer, and a part of blue light is emitted as blue light. As a result, white light can be realized. Further, by appropriately configuring the wavelength conversion layer, an emission spectrum (an emission spectrum as shown in fig. 2) in which peaks of red light, green light, and blue light are clear and overlapping of the respective colors of light is small can be realized.
Typically, the wavelength conversion layer comprises a matrix and quantum dots dispersed in the matrix. As a material constituting the matrix (hereinafter also referred to as a matrix material), any appropriate material may be used. Examples of such a material include resins, organic oxides, and inorganic oxides. The base material preferably has low oxygen permeability and moisture permeability, has high light stability and chemical stability, has a prescribed refractive index, has excellent transparency, and/or has excellent dispersibility with respect to quantum dots. In view of these, the base material is preferably a resin. The resin may be a thermoplastic resin, a thermosetting resin, or an active energy ray-curable resin (e.g., an electron ray-curable resin, an ultraviolet ray-curable resin, or a visible light ray-curable resin). The resin is preferably a thermosetting resin or an ultraviolet curable resin, and more preferably a thermosetting resin. The resins may be used alone or in combination (e.g., blending, copolymerization).
The quantum dots may control the wavelength conversion characteristics of the wavelength conversion layer. Specifically, by appropriately combining quantum dots having different emission center wavelengths, a wavelength conversion layer that realizes light having a desired emission center wavelength can be formed. The luminescence center wavelength of the quantum dot can be adjusted by the material and/or composition, particle size, shape, etc. of the quantum dot. As the quantum dots, for example, a quantum dot having a luminescence center wavelength in a wavelength band ranging from 600nm to 680nm (hereinafter referred to as quantum dot a), a quantum dot having a luminescence center wavelength in a wavelength band ranging from 500nm to 600nm (hereinafter referred to as quantum dot B), and a quantum dot having a luminescence center wavelength in a wavelength band ranging from 400nm to 500nm (hereinafter referred to as quantum dot C) are known. The quantum dot a is excited by excitation light (light from a backlight light source in the present invention) to emit red light, the quantum dot B emits green light, and the quantum dot C emits blue light. When light of a predetermined wavelength (light from a backlight source) is made incident and passes through the wavelength conversion layer by appropriately combining them, light having a luminescence center wavelength in a desired wavelength band can be realized.
The quantum dots may be composed of any suitable material. The quantum dots may be composed of preferably inorganic materials, more preferably inorganic conductor materials or inorganic semiconductor materials. Examples of the semiconductor material include group II-VI, group III-V, group IV-VI and group IV semiconductors. As a specific example, si, ge, sn, se, te, B, C (including diamond )、P、BN、BP、BAs、AlN、AlP、AlAs、AlSb、GaN、GaP、GaAs、GaSb、InN、InP、InAs、InSb、ZnO、ZnS、ZnSe、ZnTe、CdS、CdSe、CdSeZn、CdTe、HgS、HgSe、HgTe、BeS、BeSe、BeTe、MgS、MgSe、GeS、GeSe、GeTe、SnS、SnSe、SnTe、PbO、PbS、PbSe、PbTe、CuF、CuCl、CuBr、CuI、Si3N4、Ge3N4、Al2O3、(Al、Ga、In)2(S、Se、Te)3、Al2CO., which may be used alone or in combination of 2 or more kinds thereof, quantum dots may also include a p-type dopant or an n-type dopant) may be cited.
The size of the quantum dots can be any suitable size depending on the desired emission wavelength. The size of the quantum dot is preferably 1nm to 10nm, more preferably 2nm to 8nm. When the size of the quantum dot is in such a range, green and red light are emitted clearly, respectively, and high color rendering properties can be achieved. For example, green light can emit light with a quantum dot size of about 7nm, and red light can emit light with a quantum dot size of about 3 nm. The size of the quantum dot is, for example, an average particle diameter in the case of a true sphere, and is a size along the smallest axis in the other shapes. The shape of the quantum dot may be any appropriate shape according to the purpose. Specific examples thereof include true spheres, scales, plates, ellipsoids, and indefinite forms.
The quantum dots may be blended in a proportion of preferably 1 to 50 parts by weight, more preferably 2 to 30 parts by weight, based on 100 parts by weight of the base material. When the amount of the quantum dots is in such a range, a liquid crystal display device excellent in color balance of all RGB can be realized.
Details of quantum dots are described in, for example, japanese patent application laid-open publication No. 2012-169271, japanese patent application laid-open publication No. 2015-102857, japanese patent application laid-open publication No. 2015-65158, japanese patent application laid-open publication No. 2013-544018, and japanese patent application laid-open publication No. 2010-533976, and the descriptions of these publications are incorporated by reference in the present specification. The quantum dot may be commercially available.
The thickness of the wavelength conversion layer is preferably 1 μm to 500 μm, more preferably 100 μm to 400 μm. When the thickness of the wavelength conversion layer is in such a range, the conversion efficiency and durability are excellent.
The wavelength conversion layer is disposed as a film on the emission side of an LED (light source) in the backlight unit.
Examples
Hereinafter, the present invention will be specifically described with reference to examples, but the present invention is not limited to these examples. The measurement method of each characteristic is as follows. Unless otherwise specifically noted, "parts" and "%" in the examples are based on weight.
(1) Thickness of (L)
The measurement was performed using a dial gauge (manufactured by PEACOCK Co., ltd., product name "DG-205", dial gauge stand (product name "pds-2")).
(2) Phase difference
A50 mm by 50mm sample was cut from each of the retardation film and the liquid crystal cured layer as a measurement sample, and measurement was performed using Axoscan manufactured by Axometrics corporation. 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 refractive indices nx, ny, nz were calculated from the obtained phase difference values.
(3) Water absorption rate
The water absorption of plastics was measured according to "test method for boiling water absorption" described in JIS K7209. The test piece was square with a side length of 50mm, and the test piece was immersed in water at a water temperature of 25℃for 24 hours, and then the weight change before and after immersion was measured. The unit is%.
(4) Backlight spectrometry
The liquid crystal display device obtained in example 2 was allowed to display a white image, and the light emission spectrum was measured using SR-UL1R manufactured by Topcon corporation. Based on the wavelength λ1, wavelength λ2, wavelength λ3, height hp1, height hp2, height hp3, height hB1, height hB2, half-value width Δλ1, half-value width Δλ2, and half-value width Δλ3 shown in fig. 3 related to the obtained emission spectrum, light sources satisfying the following formulas (1) to (3) are set as light sources having discontinuous spectrums. Further, since the spectrum of the display light when displaying a white image in the liquid crystal display device is made substantially equal to the emission spectrum of the backlight source, the spectrum of the display light when displaying a white image is set as the emission spectrum of the backlight source.
(λ2-λ1)/(Δλ2+Δλ1)＞1 (1)
(λ3-λ2)/(Δλ3+Δλ2)＞1 (2)
0.8≤{hP2-(hB2+hB1)/2}/hP2≤1 (3)
(5) Visibility evaluation
The white images were displayed on the display devices obtained in each example and each comparative example, and the visibility when the images were observed through polarized sunglasses was evaluated according to the following criteria.
Good color and rainbow unevenness are not generated
Failure produces coloration
Example 1 >
(Production of retardation film A constituting the 1 st retardation layer)
The polymerization was carried out using a batch polymerization apparatus comprising 2 vertical reactors equipped with stirring wings and a reflux cooler controlled to 100 ℃. 9,9- [4- (2-hydroxyethoxy) phenyl ] fluorene (BHEPF), isosorbide (ISB), diethylene glycol (DEG), diphenyl carbonate (DPC) and magnesium acetate 4 hydrate were charged so that the molar ratio became BHEPF/ISB/DEG/DPC/magnesium acetate=0.348/0.490/0.162/1.005/1.00×10 -5. After the nitrogen substitution was sufficiently performed in the reactor (oxygen concentration was 0.0005 to 0.001 vol%), the reactor was warmed by a heat medium, and stirring was started at the time when the internal temperature reached 100 ℃. After 40 minutes from the start of the temperature increase, the internal temperature was controlled to 220℃and the pressure was reduced to 13.3kPa within 90 minutes after the start of the temperature increase. The phenol vapor by-produced together with the polymerization reaction was introduced into a reflux cooler at 100℃to return a certain amount of monomer components contained in the phenol vapor to the reactor, and the uncondensed phenol vapor was introduced into a condenser at 45℃and recovered.
After introducing nitrogen gas into the 1 st reactor and once returning to the atmospheric pressure, the oligomerization reaction liquid in the 1 st reactor was transferred to the 2 nd reactor. Then, the temperature rise and pressure reduction in the 2 nd reactor were started, and the internal temperature was set to 240℃and the pressure was set to 0.2kPa within 50 minutes. Thereafter, polymerization was carried out until a predetermined stirring power was reached. At the time of reaching the predetermined power, nitrogen was introduced into the reactor and repressed, and the reaction solution was withdrawn in the form of strands and pelletized by a rotary cutter to obtain a copolymerized polycarbonate resin of BHEPF/ISB/deg=34.8/49.0/16.2 [ mol% ]. The reduced viscosity of the polycarbonate resin was 0.430dL/g, and the glass transition temperature was 128 ℃.
The obtained polycarbonate resin was dissolved in methylene chloride to prepare a birefringent layer-forming material. Next, the above-mentioned birefringent layer-forming material was directly coated on a shrinkable film (longitudinal uniaxially stretched polypropylene film, TOKYO PRINTING INK MFG co., ltd. Manufactured under the trade name "Noblen"), and the coated film was dried at a drying temperature of 30 ℃ for 5 minutes and at 80 ℃ for 5 minutes, to form a laminate (60 μm) of a shrinkable film/birefringent layer.
The obtained laminate was preheated to 142 ℃ in the preheating zone of the stretching apparatus. In the preheating zone, the clamp pitch of the left and right clamps was 125mm. Next, the film entered into the 1 st oblique stretching region C1, and at the same time, the clip pitch of the right clip began to increase, from 125mm to 177.5mm in the 1 st oblique stretching region C1. The jig pitch change rate was 1.42. In the 1 st inclined stretching region C1, the clamp pitch starts to be reduced with respect to the clamp pitch of the left clamp, and in the 1 st inclined stretching region C1, the clamp pitch is reduced from 125mm to 90mm. The jig pitch change rate was 0.72. Further, the film entered the 2 nd oblique stretching region C2, and at the same time, the clip pitch of the left clip began to increase, from 90mm to 177.5mm in the 2 nd oblique stretching region C2. On the other hand, the grip pitch of the right grip was maintained as it was 177.5mm in the 2 nd inclined stretching region C2. Further, the stretching was also performed 1.7 times in the width direction simultaneously with the above-mentioned oblique stretching. The oblique stretching was performed at 135 ℃. Subsequently, MD (Machinedirection ) shrinkage treatment is performed in the shrinkage region. Specifically, the clamp pitch of each of the left clamp and the right clamp was reduced from 177.5mm to 160mm. The shrinkage in the MD shrinkage treatment was 10.0%. The retardation film a is formed on the shrinkable film by the stretching treatment described above. Then, the retardation film a was peeled off from the shrinkable film.
The phase difference film a (thickness 60 μm) was obtained in the above manner. The Re (550) of the obtained retardation film A was 140nm, rth (550) was 70nm, and Re (450)/Re (550) was 0.89. The slow axis direction of the retardation film a was 135 ° with respect to the longitudinal direction.
(Production of polarizer)
A-PET (amorphous polyethylene terephthalate) film (trade name: NOVACLEAR SH046200 μm manufactured by Mitsubishi resin Co., ltd.) was prepared as a base material, and corona treatment (58W/m 2/min) was applied to the surface. On the other hand, a laminate having a PVA layer provided on a substrate was prepared by coating a substrate with 1wt% of PVA (polymerization degree: 4200, saponification degree: 99.2%) to which was added acetoacetyl-modified PVA (trade name: GOHSEFIMER Z200 (polymerization degree: 1200, saponification degree: 99.0% or more, acetoacetyl-modification degree: 4.6%) manufactured by Nippon chemical Co., ltd.) so that the film thickness after drying became 12 μm, and drying the substrate by hot air drying at 60℃for 10 minutes.
Next, the laminate was first stretched in the MD direction at 130 ℃ by 2.0 times in air to produce a stretched laminate. Next, a step of immersing the stretched laminate in an aqueous boric acid insolubilization solution having a liquid temperature of 30 ℃ for 30 seconds to insolubilize the PVA layer after orientation of PVA molecules contained in the stretched laminate was performed. The aqueous solution of boric acid for insolubilization in this step was prepared as an aqueous solution containing 3 parts by weight of boric acid per 100 parts by weight of water. The stretched laminate after the insolubilization step is dyed to produce a colored laminate. The colored laminate is a laminate in which iodine is adsorbed on a PVA layer included in a stretched laminate by immersing the stretched laminate in a dye solution. The dyeing liquid contains iodine and potassium iodide, the liquid temperature of the dyeing liquid is set to 30 ℃, water is used as a solvent, the iodine concentration is set to be in the range of 0.08-0.25 wt%, and the potassium iodide concentration is set to be in the range of 0.56-1.75 wt%. The ratio of the concentration of iodine to potassium iodide was set to 1:7. as the dyeing conditions, the iodine concentration and the dipping time were set so that the transmittance of the monomer of the PVA-based resin layer constituting the polarizer became 40.9%.
Next, a step of immersing the colored laminate in an aqueous solution of boric acid for crosslinking at 30 ℃ for 60 seconds to crosslink PVA molecules of the PVA layer having iodine adsorbed thereto was performed. The aqueous boric acid solution for crosslinking used in the crosslinking step is an aqueous solution having a boric acid content of 3 parts by weight per 100 parts by weight of water and a potassium iodide content of 3 parts by weight per 100 parts by weight of water. Further, the obtained colored laminate was stretched at a stretching temperature of 70 ℃ in the same direction as the stretching in the air at a stretching temperature of 70 ℃ to a stretching ratio of 2.7 times and a final stretching ratio of 5.4 times, whereby an optical film laminate including a polarizer for use was obtained. The aqueous boric acid solution used in the stretching step was an aqueous solution having a boric acid content of 4.0 parts by weight per 100 parts by weight of water and a potassium iodide content of 5 parts by weight per 100 parts by weight of water. The obtained optical film laminate was taken out of the aqueous boric acid solution, and boric acid attached to the surface of the PVA layer was washed with an aqueous solution containing 4 parts by weight of potassium iodide content relative to 100 parts by weight of water. The washed optical film laminate was dried by a drying process using hot air at 60 ℃ to obtain an elongated polarizer having a thickness of 5 μm and an absorption axis in the longitudinal direction, which was laminated on a PET film.
(Production of retardation film B constituting the 2 nd retardation layer)
The polycarbonate resin was obtained by the same method as that for obtaining the polycarbonate resin at the time of producing the phase difference film a. After the obtained polycarbonate resin was dried under vacuum at 80℃for 5 hours, a film forming apparatus equipped with a single screw extruder (ISUZU KAKOKI Co., ltd., manufactured by Koku et al, screw diameter: 25mm, cylinder set temperature: 220 ℃), T-die (width: 900mm, set temperature: 220 ℃), chilled roll (set temperature: 125 ℃) and a coiler was used to prepare a polycarbonate resin film having a thickness of 130. Mu.m. The water absorption rate of the obtained polycarbonate resin film was 1.2%.
The above polycarbonate resin film was subjected to oblique stretching by the method according to example 1 of japanese patent application laid-open No. 2014-194483 to obtain a retardation film B.
The specific manufacturing steps of the retardation film B are as follows: the polycarbonate resin film (130 μm thick and 765mm wide) was preheated to 142℃in the preheating zone of the stretching apparatus. In the preheating zone, the clamp pitch of the left and right clamps was 125mm. Next, the film entered into the 1 st oblique stretching region C1, and at the same time, the clip pitch of the right clip began to increase, from 125mm to 177.5mm in the 1 st oblique stretching region C1. The jig pitch change rate was 1.42. In the 1 st inclined stretching region C1, the clamp pitch starts to be reduced with respect to the clamp pitch of the left clamp, and in the 1 st inclined stretching region C1, the clamp pitch is reduced from 125mm to 90mm. The jig pitch change rate was 0.72. Further, the film entered the 2 nd oblique stretching region C2, and at the same time, the clip pitch of the left clip began to increase, from 90mm to 177.5mm in the 2 nd oblique stretching region C2. On the other hand, the grip pitch of the right grip was maintained as it was 177.5mm in the 2 nd inclined stretching region C2. Further, the stretching was also performed 1.9 times in the width direction simultaneously with the above-mentioned oblique stretching. The oblique stretching was performed at 135 ℃. Then, MD shrinkage processing is performed in the shrinkage region. Specifically, the clamp pitch of each of the left clamp and the right clamp was reduced from 177.5mm to 165mm. The shrinkage in the MD shrinkage treatment was 7.0%.
The phase difference film B (thickness 40 μm) was obtained in the above manner. The Re (550) of the obtained retardation film B was 140nm, rth (550) was 168nm, and Re (450)/Re (550) was 0.89. The slow axis direction of the retardation film B was 45 ° with respect to the longitudinal direction.
(Production of polarizing plate with retardation layer)
In the polarizer manufactured as described above, the retardation film a was bonded to the surface opposite to the PET film via a UV curable adhesive such that the angle between the slow axis of the retardation film a and the absorption axis of the polarizer became substantially 135 ° with respect to the polarizer having a thickness of 5 μm laminated on the PET film. Further, after the PET film was peeled from the laminate, the retardation film B was bonded to a surface of the polarizer opposite to the retardation film a via a UV curable adhesive so that the slow axis thereof was substantially orthogonal to the slow axis of the retardation film a, thereby producing a polarizing plate with a long retardation layer.
(Production of organic EL display device)
An adhesive layer was formed on the retardation film B side of the obtained polarizing plate with a retardation layer by using an acrylic adhesive, and cut into dimensions of 50mm×50mm.
The smart phone (Galaxy-S5 manufactured by samsung wireless corporation) was disassembled and the organic EL panel of the organic EL display device was taken out. The polarizing film attached to the organic EL panel was peeled off, and instead, the polarizing plate with the retardation layer cut into 50mm×50mm was attached via the adhesive layer, thereby obtaining an organic EL panel. The organic EL display device of the present embodiment is an organic EL display device in which the organic EL panel to which the polarizing plate with a retardation plate is attached is mounted in the smart phone. The organic EL display device was allowed to display a white image, and visibility was evaluated through polarized sunglasses in a white image state. The evaluation results are shown in table 1.
Example 2 >
(Production of retardation film C constituting the 2 nd retardation layer)
In a reaction vessel equipped with a stirring device, 27.0kg of 2, 2-bis (4-hydroxyphenyl) -4-methylpentane and 0.8kg of tetrabutylammonium chloride were dissolved in 250L of sodium hydroxide solution. While stirring, a solution obtained by dissolving 13.5kg of terephthaloyl chloride and 6.30kg of isophthaloyl chloride in 300L of toluene was added at one time, and stirred at room temperature for 90 minutes to prepare a polycondensation solution. Thereafter, the polycondensation solution is allowed to stand and separated to separate a toluene solution containing polyarylate. Then, the separated liquid was washed with acetic acid water, further washed with ion-exchanged water, and then poured into methanol to precipitate polyarylate. The precipitated polyarylate was filtered and dried under reduced pressure to obtain 34.1kg (yield 92%) of a white polyarylate.
10Kg of the obtained polyarylate was dissolved in 73kg of toluene to prepare a coating liquid. Thereafter, the coating liquid was directly coated on a shrinkable film (longitudinal uniaxially stretched polypropylene film, TOKYO PRINTING INK MFG co., ltd. Manufactured under the trade name "Noblen"), and the coated film was dried at a drying temperature of 60 ℃ for 5 minutes and at 80 ℃ for 5 minutes, to form a laminate of a shrinkable film/a birefringent layer. The obtained laminate was stretched at a shrinkage ratio of 0.80 in the MD direction and 1.17 times in the TD direction by using a simultaneous biaxial stretching machine at a stretching temperature of 155 ℃, to form a retardation film C on the shrinkable film. Then, the retardation film C was peeled off from the shrinkable film. The thickness of the retardation film C was 17. Mu.m, re (550) was 270nm, rth (550) was 135nm, re (450)/Re (550) was 1.10, and the nz coefficient was 0.50. The slow axis direction of the retardation film C was 90 ° with respect to the longitudinal direction.
(Production of polarizing plate with retardation layer)
A polarizing plate with a retardation layer was produced in the same manner as in example 1, except that the retardation film a was bonded so that the angle between the slow axis thereof and the absorption axis of the polarizer became substantially 45 °, and the retardation film C was used instead of the retardation film B, so that the angle between the slow axis thereof and the slow axis of the retardation film a became substantially 45 °, and the slow axis of the retardation film C was bonded so as to be substantially orthogonal to the absorption axis of the polarizer.
(Production of liquid Crystal display device)
The liquid crystal panel was taken out from a liquid crystal display device of a smart phone (XperiaZ manufactured by SONY corporation: xperiaZ: the light emission spectrum of the backlight was discontinuous) equipped with an IPS mode liquid crystal display device, and a polarizing plate disposed on the visible side of the liquid crystal cell was removed, and the glass surface of the liquid crystal cell was washed. Next, a surface of the retardation film C side of the polarizing plate with a retardation plate was laminated on a surface of the liquid crystal cell on the viewing side via an acrylic adhesive (thickness: 20 μm) so that the absorption axis of the polarizer was orthogonal to the initial alignment direction of the liquid crystal cell, thereby obtaining a liquid crystal panel. The liquid crystal panel on which the polarizing plate with a retardation plate is laminated is mounted in the smart phone as the liquid crystal display device of the present embodiment. The liquid crystal display device was allowed to display a white image, and visibility was evaluated through polarized sunglasses in a white image state. The evaluation results are shown in table 1.
Comparative example 1 >
(Production of retardation film D constituting the 1 st retardation layer)
The retardation film D was obtained by stretching a commercially available ARTON film (manufactured by JSR corporation, thickness 70 μm). The Re (550) of the obtained retardation film D was 140nm, rth (550) was 168nm, and Re (450)/Re (550) was 1.00. The slow axis direction of the retardation film D was 135 ° with respect to the longitudinal direction.
(Production of polarizing plate with retardation layer)
A polarizing plate with a retardation layer was produced in the same manner as in example 1, except that a retardation film D was used instead of the retardation film a, and the retardation film B was bonded so that the slow axis thereof was substantially 45 ° with respect to the absorption axis of the polarizer, and the slow axis thereof was substantially orthogonal to the slow axis of the retardation film D.
(Production of organic EL display device)
An organic EL display device was produced in the same manner as in example 1, except that the polarizing plate with the retardation layer was used. The organic EL display device was allowed to display a white image, and visibility was evaluated through polarized sunglasses in a white image state. The evaluation results are shown in table 1.
Comparative example 2 >
(Production of retardation film E constituting the 1 st retardation layer)
Using phosgene as a carbonate precursor, as aromatic bivalent phenol components, (a) 2, 2-bis (4-hydroxyphenyl) propane and (B) 1, 1-bis (4-hydroxyphenyl) -3, 5-trimethylcyclohexane, and obtaining (a) according to a conventional method: the weight ratio of (B) is 4:6 and comprises repeating units of the following chemical formulas (I) and (II) having a weight average molecular weight (Mw) of 60,000 [ number average molecular weight (Mn) =33,000, mw/Mn=1.78 ]. 70 parts by weight of the polycarbonate resin and 30 parts by weight of a styrene resin having a weight average molecular weight (Mw) of 1,300 [ number average molecular weight (Mn) =716, mw/mn=1.78 ] (HIMER SB manufactured by Sanyo chemical industry) were added to 300 parts by weight of methylene chloride, and the mixture was stirred and mixed at room temperature for 4 hours to obtain a transparent solution. The solution was cast on a glass plate, and after leaving at room temperature for 15 minutes, peeled off from the glass plate, dried in an oven at 80℃for 10 minutes, and dried at 120℃for 20 minutes, to obtain a polymer film having a thickness of 40 μm and a glass transition temperature (Tg) of 140 ℃. The transmittance of the obtained polymer film at a wavelength of 590nm was 93%. In addition, the in-plane retardation value of the polymer film: re (590) was 5.0nm, the phase difference in the thickness direction: rth (590) is 12.0nm. The average refractive index was 1.576.
The obtained polymer film was stretched to obtain a retardation film E. The Re (550) of the obtained retardation film E was 140nm, rth (550) was 168nm, and Re (450)/Re (550) was 1.06. The slow axis direction of the retardation film E was 135 ° with respect to the longitudinal direction.
(Production of polarizing plate with retardation layer)
A polarizing plate with a retardation layer was produced in the same manner as in example 1, except that a retardation film E was used instead of the retardation film a, and the retardation film B was bonded so that the slow axis thereof was substantially 45 ° with respect to the absorption axis of the polarizer, and the slow axis thereof was substantially orthogonal to the slow axis of the retardation film E.
(Production of organic EL display device)
An organic EL display device was produced in the same manner as in example 1, except that the polarizing plate with the retardation layer was used. The organic EL display device was allowed to display a white image, and visibility was evaluated through polarized sunglasses in a white image state. The evaluation results are shown in table 1.
Industrial applicability
The polarizing plate with a retardation layer of the present invention is preferably used for image display devices such as liquid crystal display devices and organic EL display devices.
Symbol description
10.1 St phase difference layer
20. Polarizer
30. Adhesive layer
40. Spacer sheet
50. 2Nd phase difference layer
100. Polarizing plate with phase difference layer
101. Polarizing plate with phase difference layer
Claims (6)
1. A polarizing plate with a retardation layer,
Which is in a strip shape and comprises a phase difference layer, a polarizer, a phase difference layer and an adhesive layer in sequence,
The in-plane retardation Re (550) of the retardation layer is 100-180 nm, the relationship of Re (450) < Re (550) < Re (650) is satisfied, the refractive index ellipsoid of the retardation layer shows a relationship of nx > Nz > ny, the Nz coefficient is 0.2-0.8,
The in-plane retardation Re (550) of the additional retardation layer is 100nm to 180nm, and the refractive index ellipsoids of the additional retardation layer show a relationship of nx > ny.gtoreq.nz,
The slow axis of the phase difference layer is substantially orthogonal to the slow axis of the further phase difference layer,
The in-plane retardation of the additional retardation layer satisfies the relationship of Re (450) < Re (550) < Re (650).
2. The polarizing plate with a retardation layer as claimed in claim 1, wherein,
The angle formed by the slow axis of the phase difference layer and the absorption axis of the polarizer is 125-145 degrees.
3. The polarizing plate with a retardation layer as claimed in claim 1, wherein a spacer is temporarily bonded to the outer side of the adhesive layer.
4. The polarizing plate with a retardation layer as claimed in claim 1, which is in a roll form.
5. An image display device comprising a cut-off polarizing plate with a retardation layer according to claim 1 on a viewing side, wherein the retardation layer of the polarizing plate with a retardation layer is disposed on the viewing side.
6. The image display device according to claim 5, which is a liquid crystal display device or an organic electroluminescent display device provided with a backlight light source having a discontinuous light emission spectrum.
Applications Claiming Priority (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2015233761 | 2015-11-30 | ||
| JP2015-233761 | 2015-11-30 | ||
| JP2016200418A JP6877945B2 (en) | 2015-11-30 | 2016-10-11 | Polarizing plate with retardation layer and image display device |
| JP2016-200418 | 2016-10-11 | ||
| CN201680070082.4A CN108292001A (en) | 2015-11-30 | 2016-11-18 | Polarizing film with phase separation layer and image display device |
| PCT/JP2016/084247 WO2017094530A1 (en) | 2015-11-30 | 2016-11-18 | Phase difference layer-provided polarizing plate and image display device |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201680070082.4A Division CN108292001A (en) | 2015-11-30 | 2016-11-18 | Polarizing film with phase separation layer and image display device |
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| CN117908178A true CN117908178A (en) | 2024-04-19 |
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| CN202410253808.4A Pending CN117908178A (en) | 2015-11-30 | 2016-11-18 | Polarizing plate with retardation layer and image display device |
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| WO (1) | WO2017094530A1 (en) |
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| TW201942605A (en) * | 2018-02-09 | 2019-11-01 | 日商住友化學股份有限公司 | Circularly polarizing plate and optical display device |
| JP7267123B2 (en) * | 2019-06-20 | 2023-05-01 | 日東電工株式会社 | Sets of optical films for imaging systems |
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| JP4010810B2 (en) * | 1999-07-29 | 2007-11-21 | 帝人株式会社 | Retardation film, retardation film composite, and liquid crystal display using the same |
| JP4236098B2 (en) * | 2003-08-01 | 2009-03-11 | 日東電工株式会社 | Birefringent optical film |
| JP5606330B2 (en) * | 2009-01-19 | 2014-10-15 | 株式会社カネカ | Method for producing retardation film, method for producing optical film, method for producing image display device, and method for producing liquid crystal display device |
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2016
- 2016-11-18 CN CN202410253808.4A patent/CN117908178A/en active Pending
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