WO2023176628A1 - Stratifié optique et système d'affichage - Google Patents

Stratifié optique et système d'affichage Download PDF

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Publication number
WO2023176628A1
WO2023176628A1 PCT/JP2023/008813 JP2023008813W WO2023176628A1 WO 2023176628 A1 WO2023176628 A1 WO 2023176628A1 JP 2023008813 W JP2023008813 W JP 2023008813W WO 2023176628 A1 WO2023176628 A1 WO 2023176628A1
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WO
WIPO (PCT)
Prior art keywords
adhesive layer
optical laminate
adhesive
meth
weight
Prior art date
Application number
PCT/JP2023/008813
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English (en)
Japanese (ja)
Inventor
健太郎 小野
周作 後藤
Original Assignee
日東電工株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP2022077657A external-priority patent/JP2023134317A/ja
Priority claimed from JP2022077634A external-priority patent/JP7516457B2/ja
Priority claimed from JP2022077677A external-priority patent/JP2023166852A/ja
Priority claimed from JP2022077632A external-priority patent/JP7516455B2/ja
Priority claimed from JP2022077676A external-priority patent/JP2023166851A/ja
Priority claimed from JP2022077658A external-priority patent/JP2023166840A/ja
Priority claimed from JP2022077678A external-priority patent/JP2023166853A/ja
Priority claimed from JP2022077633A external-priority patent/JP7516456B2/ja
Priority claimed from JP2022077659A external-priority patent/JP2023166841A/ja
Priority claimed from JP2022077679A external-priority patent/JP7516458B2/ja
Priority claimed from JP2022077631A external-priority patent/JP2023134316A/ja
Priority claimed from JP2022212221A external-priority patent/JP2024095149A/ja
Application filed by 日東電工株式会社 filed Critical 日東電工株式会社
Publication of WO2023176628A1 publication Critical patent/WO2023176628A1/fr

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B17/00—Systems with reflecting surfaces, with or without refracting elements
    • G02B17/08—Catadioptric systems
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/02—Viewing or reading apparatus
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B3/00—Simple or compound lenses
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/08—Mirrors
    • 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
    • G02C—SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES
    • G02C7/00—Optical parts
    • 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
    • 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
    • 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
    • G02F1/1337—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
    • H04N13/30—Image reproducers
    • H04N13/332—Displays for viewing with the aid of special glasses or head-mounted displays [HMD]
    • H04N13/344—Displays for viewing with the aid of special glasses or head-mounted displays [HMD] with head-mounted left-right displays
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
    • H04N13/30—Image reproducers
    • H04N13/346—Image reproducers using prisms or semi-transparent mirrors
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/64—Constructional details of receivers, e.g. cabinets or dust covers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/66—Transforming electric information into light information
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B33/00—Electroluminescent light sources
    • H05B33/02—Details
    • H—ELECTRICITY
    • 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
    • H05B33/10—Apparatus or processes specially adapted to the manufacture of electroluminescent light sources
    • 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
    • H05B33/12—Light sources with substantially two-dimensional radiating surfaces
    • H05B33/22—Light sources with substantially two-dimensional radiating surfaces characterised by the chemical or physical composition or the arrangement of auxiliary dielectric or reflective layers
    • H05B33/24—Light sources with substantially two-dimensional radiating surfaces characterised by the chemical or physical composition or the arrangement of auxiliary dielectric or reflective layers of metallic reflective layers
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K50/00—Organic light-emitting devices
    • 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

Definitions

  • the present invention relates to an optical laminate and a display system using the optical laminate.
  • Image display devices represented by liquid crystal display devices and electroluminescence (EL) display devices are rapidly becoming popular.
  • EL electroluminescence
  • optical members such as polarizing members and retardation members are generally used to realize image display and improve image display performance (see, for example, Patent Document 1).
  • the main purpose of the present invention is to provide an optical laminate with stable optical properties even under harsh environments.
  • the optical laminate according to the embodiment of the present invention is an optical laminate including at least one optical member and at least one adhesive layer, and the total number of the adhesive layers included in the optical laminate. is N, the adhesive layer of N/2 or more has a linear expansion coefficient ⁇ 1 when the temperature is raised from 20°C to 30°C and a linear expansion coefficient ⁇ 2 when the temperature is lowered from 30°C to 20°C is 0.
  • the adhesive layer A satisfies the relationship: .8 ⁇ 1/ ⁇ 2 ⁇ 1.2.
  • the adhesive layer A may have a thickness of 1 ⁇ m or more and 15 ⁇ m or less.
  • the thickness of the optical laminate described in [1] or [2] above may be 100 ⁇ m or more and 300 ⁇ m or less.
  • the optical laminate according to any one of [1] to [3] above includes a first adhesive layer, a polarizing member, a second adhesive layer, a first retardation member, and a third adhesive layer.
  • the adhesive layer A may include an adhesive layer and a protective member in this order, and two or more selected from the first, second, and third adhesive layers may be the adhesive layer A.
  • the first retardation member may include a ⁇ /4 member.
  • the protective member may have a surface treatment layer.
  • the adhesive composition constituting the adhesive layer A is a (meth)acrylic adhesive composition having a weight average molecular weight of 1.5 million or more. May include polymers.
  • a display system according to an embodiment of the present invention includes the optical laminate according to any one of [1] to [7] above.
  • the display system according to [8] above includes a display element having a display surface that emits light representing an image forward through a polarizing member, and a display element that is disposed in front of the display element and that emits light from the display element.
  • a reflective polarizing member that reflects the reflected light
  • a first lens portion disposed on an optical path between the display element and the reflective polarizing member; and a first lens portion between the display element and the first lens portion.
  • a half mirror that is arranged and transmits the light emitted from the display element and reflects the light reflected by the reflective polarizing member toward the reflective polarizing member; and between the display element and the half mirror.
  • a first ⁇ /4 member disposed on the optical path between the half mirror and the reflective polarizing member, and a second ⁇ /4 member disposed on the optical path between the half mirror and the reflective polarizing member; ] may be arranged on the display element side of the half mirror so that the display element and the first ⁇ /4 plate are integrally provided.
  • the linear expansion coefficient ⁇ 1 when the temperature is raised in the range of 20°C to 30°C and the linear expansion coefficient ⁇ 2 when the temperature is lowered have a relationship of 0.8 ⁇ 1/ ⁇ 2 ⁇ 1.2.
  • the adhesive layer A that satisfies the above conditions is used for more than half of the adhesive layers included in the optical laminate. This makes it possible to obtain an optical laminate with stable optical properties even under harsh environments.
  • FIG. 1 is a schematic cross-sectional view of an optical laminate according to one embodiment of the present invention.
  • FIG. 1 is a schematic cross-sectional view of an optical laminate according to one embodiment of the present invention.
  • 1 is a schematic diagram showing a general configuration of a display system according to one embodiment of the present invention. It is a figure which shows the wet heat test result of the optical laminated body obtained in the Example and the comparative example.
  • Refractive index (nx, ny, nz) "nx" is the refractive index in the direction in which the in-plane refractive index is maximum (i.e., slow axis direction), and "ny” is the direction perpendicular to the slow axis in the plane (i.e., 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 (i.e., slow axis direction), and "ny” is the direction perpendicular to the slow axis in the plane (i.e., fast axis direction) "nz” is the refractive index in the thickness direction.
  • In-plane phase difference (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.
  • Phase difference in thickness direction (Rth) is a retardation in the thickness direction measured with light having a wavelength of ⁇ nm at 23°C.
  • Rth (550) is the retardation in the thickness direction measured with light having a wavelength of 550 nm at 23°C.
  • substantially parallel includes cases within the range of 0° ⁇ 10°, for example, 0° ⁇ 5°, preferably 0° ⁇ 3°, more preferably 0° ⁇ 1 90° ⁇ 5°, preferably 90° ⁇ 3°, more preferably 90° ⁇ 1 within the range of °.
  • An optical laminate according to an embodiment of the present invention includes at least one optical member and at least one adhesive layer.
  • N/2 or more of the adhesive layers have linear expansion coefficient ⁇ 1 when the temperature is raised from 20°C to 30°C and from 30°C to 20°C.
  • the pressure-sensitive adhesive layer A has a linear expansion coefficient ⁇ 2 of 0.8 ⁇ 1/ ⁇ 2 ⁇ 1.2 when the temperature is lowered to 0.8 ⁇ 1/ ⁇ 2 ⁇ 1.2.
  • Adhesive layers with ⁇ 1/ ⁇ 2 of less than 0.8 or more than 1.2 tend to have a large difference in deformation rate when the temperature is raised and when the temperature is lowered, and the amount of deformation increases with repeated temperature changes.
  • the optical properties of the optical laminate may change, and as a result, when applied as a component of goggles with a display, the display properties thereof may be affected.
  • the adhesive layer satisfying the relationship of 0.8 ⁇ 1/ ⁇ 2 ⁇ 1.2 at a predetermined ratio or more changes in the optical properties of the optical laminate due to deformation of the adhesive layer can be suppressed. can do.
  • optical members included in the optical laminate include absorption type polarizing members, reflective polarizing members, retardation members, and the like.
  • the total number N of adhesive layers included in the optical laminate is 1 or more, preferably 2 or more, more preferably 3 or more, and for example 6 or less. In one embodiment, the total number N of adhesive layers included in the optical laminate is 2 or more and 5 or less, preferably 3 or 4.
  • the optical laminate has, for example, an adhesive layer as the outermost layer, and can be attached to an adjacent member via the adhesive layer.
  • the ratio of the number of adhesive layers A to the total number of adhesive layers included in the optical laminate is 1/2 or more, preferably 2/3 or more, more preferably 3/4 or more, and 1. There may be.
  • the number of adhesive layers A is an integer
  • the number of adhesive layers A is an integer of N/2 or more and N or less.
  • the number of adhesive layers A is an integer of 2 or more and 3 or less, that is, 2 or 3, and when N is 4, the number of adhesive layers A is 2 or more and 4 or less. is an integer of 2, 3, or 4.
  • the linear expansion coefficient ⁇ 1 when the temperature is raised from 20°C to 30°C and the linear expansion coefficient ⁇ 2 when the temperature is lowered from 30°C to 20°C are 0.8 ⁇ 1/ ⁇ 2 ⁇ 1.
  • the adhesive layer in general that satisfies the relationship 2 is referred to as adhesive layer A.
  • the plurality of adhesive layers included in the optical laminate are adhesive layers A
  • the plurality of adhesive layers have the same adhesive layer as long as the relationship of 0.8 ⁇ 1/ ⁇ 2 ⁇ 1.2 is satisfied.
  • the pressure-sensitive adhesive compositions do not need to have the same thickness, and may have the same or different thicknesses from pressure-sensitive adhesive compositions having different compositions.
  • the thickness of the optical laminate is, for example, 100 ⁇ m or more and 300 ⁇ m or less, preferably 110 ⁇ m or more and 250 ⁇ m or less, and more preferably 120 ⁇ m or more and 200 ⁇ m or less.
  • the present invention uses an adhesive layer that has a small difference in deformation rate when the temperature is raised and when the temperature is lowered. The following effects can be suitably obtained.
  • the thickness of the adhesive layer A is, for example, 1 ⁇ m or more and 15 ⁇ m or less, preferably 2 ⁇ m or more and less than 10 ⁇ m, and more preferably 3 ⁇ m or more and 8 ⁇ m or less.
  • FIG. 1A is a schematic cross-sectional view of an optical laminate according to one embodiment of the invention.
  • the optical laminate 100a shown in FIG. 1A includes a first adhesive layer a1, a polarizing member 10, a second adhesive layer a2, a first retardation member 20, a third adhesive layer a3, and a protective member 30. and, in this order.
  • the polarizing member 10 and the first retardation member 20 are bonded together via the second adhesive layer a2
  • the first retardation member 20 and the protective member 30 are bonded together via the third adhesive layer a3. It is pasted together.
  • the first adhesive layer a1 is an adhesive layer for bonding the optical laminate 100a itself to an adjacent member (for example, another member constituting goggles with a display), and its surface is used for use. In the meantime, it may be protected by a release liner.
  • the total number of adhesive layers is three, and two or more of them are the adhesive layers A described above.
  • the thickness of the optical laminate 100a is, for example, 100 ⁇ m or more and 300 ⁇ m or less, preferably 110 ⁇ m or more and 250 ⁇ m or less, and more preferably 120 ⁇ m or more and 200 ⁇ m or less.
  • the optical laminate 100a has a total of three adhesive layers (first adhesive layer a1, second adhesive layer a2, and third adhesive layer a3), at least two of which are adhesive layers A. Preferably, all the adhesive layers are adhesive layers A.
  • the first adhesive layer a1 and the second adhesive layer a2 are adhesive layers A.
  • the effects of the present invention can be suitably obtained by arranging the adhesive layer A, which has high shape stability against temperature changes when the optical laminate is applied to VR goggles, near the display element and the first retardation member 20. be able to.
  • the adhesive layer A typically has a linear expansion coefficient ⁇ 1 when the temperature rises from 20°C to 30°C and a linear expansion coefficient ⁇ 2 when the temperature falls from 30°C to 20°C of 0.8 ⁇
  • the relationship ⁇ 1/ ⁇ 2 ⁇ 1.2 is satisfied, preferably 0.85 ⁇ 1/ ⁇ 2 ⁇ 1.15, and more preferably the relationship 0.9 ⁇ 1/ ⁇ 2 ⁇ 1.1.
  • ⁇ 1 of the adhesive layer A may be, for example, 5.0 ⁇ 10 ⁇ 4 /°C or more and 7.0 ⁇ 10 ⁇ 4 /°C or less.
  • ⁇ 2 of the adhesive layer A is, for example, 5.0 ⁇ 10 ⁇ 4 /°C or more and 7.0 ⁇ 10 ⁇ 4 /°C or less, and for example, 6.0 ⁇ 10 ⁇ 4 / °C or more and 7.0 ⁇ 10 ⁇ 4 /°C. It can be below °C.
  • the adhesive layer A has a coefficient of linear expansion ⁇ 1 when the temperature is raised from 60°C to 70°C and a coefficient of linear expansion ⁇ 2 when the temperature is lowered from 70°C to 60°C, for example, 1.0 ⁇ 1/ ⁇ 2 ⁇ 1.5.
  • the following relationship is satisfied, preferably 1.05 ⁇ 1/ ⁇ 2 ⁇ 1.45, more preferably 1.1 ⁇ 1/ ⁇ 2 ⁇ 1.4.
  • ⁇ 1 and ⁇ 2 of the adhesive layer A are not limited as long as the effects of the present invention can be obtained, and may be arbitrary values.
  • ⁇ 1 of the adhesive layer A may be, for example, 8.0 ⁇ 10 ⁇ 4 /°C or more and 9.0 ⁇ 10 ⁇ 4 /°C or less.
  • ⁇ 2 of the adhesive layer A may be, for example, 6.0 ⁇ 10 ⁇ 4 /°C or more and 7.0 ⁇ 10 ⁇ 4 /°C or less.
  • the storage modulus of the adhesive layer A at 25° C. is, for example, 5 ⁇ 10 4 Pa or more, preferably 10 ⁇ 10 4 Pa or more, more preferably 12 ⁇ 10 4 Pa or more, and, for example, 20 ⁇ 10 4 Pa or less. , preferably 15 ⁇ 10 4 Pa or less.
  • the storage modulus can be determined by dynamic viscoelasticity measurement (for example, parallel plate (8.0 mm ⁇ ), It can be determined using the measurement conditions of torsion mode and frequency range of 1 Hz).
  • the adhesive layer A may be formed from any suitable adhesive composition.
  • the adhesive composition forming the adhesive layer A includes an acrylic adhesive composition, a rubber adhesive composition, a silicone adhesive composition, a polyester adhesive composition, a urethane adhesive composition, and an epoxy adhesive composition. and polyether-based adhesive compositions. By adjusting the type, number, combination and blending ratio of monomers forming the base resin of the adhesive composition, as well as the amount of crosslinking agent, reaction temperature, reaction time, etc., desired characteristics can be achieved according to the purpose.
  • An adhesive composition can be prepared.
  • the base polymer of the adhesive composition may be used alone or in combination of two or more.
  • the adhesive layer is preferably composed of an acrylic adhesive composition containing a (meth)acrylic polymer as a base polymer.
  • the main component is a (meth)acrylic monomer represented by an alkyl group having 2 to 14 carbon atoms, preferably 3 to 12 carbon atoms, and more preferably 4 to 9 carbon atoms.
  • n-butyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, etc. are preferably used.
  • the monomer component constituting the (meth)acrylic polymer preferably further includes a nitrogen-containing monomer.
  • the content of the nitrogen-containing monomer is, for example, 0.1% to 35% by weight, preferably 3% to 30% by weight, and more preferably 5% to 25% by weight. . If the content of the nitrogen-containing monomer is within the above range, a pressure-sensitive adhesive layer with excellent durability in a heated environment and/or a high humidity environment can be obtained.
  • the nitrogen-containing monomer is a polymerizable monomer containing one or more nitrogen atoms in the monomer structure, and preferable examples include imide group-containing monomers and amide group-containing monomers. Among these, amide group-containing monomers are more preferred. In the above monomer components, the content of the amide group-containing monomer is, for example, 3% to 15% by weight, preferably 5% to 10% by weight.
  • the nitrogen-containing monomers may be used alone or in combination of two or more.
  • imide group-containing monomers examples include N-cyclohexylmaleimide, N-phenylmaleimide, N-methylmaleimide, N-ethylmaleimide, N-propylmaleimide, N-isopropylmaleimide, N-butylmaleimide, itaconimide, and the like.
  • nitrogen-containing monomers include amino group-containing monomers, (meth)acrylonitrile, N-(meth)acryloylmorpholine, N-vinyl-2-pyrrolidone, and the like.
  • the monomer component can contain other polymerizable monomers for adjusting the glass transition point and peelability of the (meth)acrylic polymer within a range that does not impair the effects of the present invention.
  • Examples of other polymerizable monomers include carboxyl group-containing monomers, sulfonic acid group-containing monomers, phosphoric acid group-containing monomers, vinyl ester monomers, and aromatic vinyl monomers, which improve cohesive strength, heat resistance, etc. can contribute to Further examples include acid anhydride group-containing monomers, hydroxyl group-containing monomers, epoxy group-containing monomers, vinyl ether monomers, etc., which can contribute to improving adhesive strength and have functional groups that act as crosslinking base points. Further, for example, a (meth)acrylic monomer having an alkyl group having 1 or 15 or more carbon atoms can be used. These polymerizable monomers may be used alone or in combination of two or more.
  • carboxyl group-containing monomers examples include acrylic acid, methacrylic acid, carboxyethyl (meth)acrylate, carboxypentyl (meth)acrylate, itaconic acid, maleic acid, fumaric acid, crotonic acid, and the like. Among them, acrylic acid and methacrylic acid are preferably used.
  • sulfonic acid group-containing monomers examples include styrene sulfonic acid, allyl sulfonic acid, 2-(meth)acrylamido-2-methylpropanesulfonic acid, (meth)acrylamidopropanesulfonic acid, sulfopropyl (meth)acrylate, and (meth)acryloyloxy.
  • examples include naphthalenesulfonic acid.
  • Examples of the phosphoric acid group-containing monomer include 2-hydroxyethyl acryloyl phosphate and the like.
  • vinyl ester monomers examples include vinyl acetate, vinyl propionate, vinyl laurate, vinyl pyrrolidone, and the like.
  • aromatic vinyl monomers examples include styrene, chlorostyrene, chloromethylstyrene, ⁇ -methylstyrene, and the like.
  • acid anhydride group-containing monomers examples include maleic anhydride, itaconic anhydride, and the like.
  • Hydroxyl group-containing monomers include 2-hydroxyethyl (meth)acrylate, 2-hydroxybutyl (meth)acrylate, 3-hydroxypropyl (meth)acrylate, 4-hydroxybutyl (meth)acrylate, and 6-hydroxyhexyl (meth)acrylate.
  • epoxy group-containing monomer examples include glycidyl (meth)acrylate, allyl glycidyl ether, and the like.
  • vinyl ether monomers examples include methyl vinyl ether, ethyl vinyl ether, isobutyl vinyl ether, and the like.
  • Examples of the (meth)acrylic monomer having an alkyl group having 1 or 15 or more carbon atoms include methyl (meth)acrylate, pentadecyl (meth)acrylate, hexadecyl (meth)acrylate, and the like.
  • the content of the other polymerizable monomers is, for example, 0.1% to 10% by weight, preferably 0.2% to 7% by weight, more preferably 0.5% by weight. % to 5% by weight.
  • examples of copolymerizable monomers other than those mentioned above include silane monomers containing silicon atoms.
  • silane monomers include 3-acryloxypropyltriethoxysilane, vinyltrimethoxysilane, vinyltriethoxysilane, 4-vinylbutyltrimethoxysilane, 4-vinylbutyltriethoxysilane, 8-vinyloctyltrimethoxysilane, -vinyloctyltriethoxysilane, 10-methacryloyloxydecyltrimethoxysilane, 10-acryloyloxydecyltrimethoxysilane, 10-methacryloyloxydecyltriethoxysilane, 10-acryloyloxydecyltriethoxysilane, and the like.
  • the silane monomers may be used alone or in combination of two or more.
  • the amount of the silane monomer blended is preferably 0.1 parts by weight to 3 parts by weight, more preferably 0.5 parts by weight to 2 parts by weight, based on 100 parts by weight of the (meth)acrylic polymer. preferable. Copolymerizing a silane monomer is preferable for improving durability.
  • the weight average molecular weight of the (meth)acrylic polymer is, for example, 600,000 or more, preferably 1,500,000 or more, more preferably 1,600,000 or more, and still more preferably 1,800,000 or more.
  • the weight average molecular weight of the (meth)acrylic polymer is, for example, 3 million or less, preferably 2.5 million or less.
  • the weight average molecular weight is a value measured by GPC (gel permeation chromatography) and calculated based on polystyrene conversion.
  • the glass transition temperature (Tg) of the above-mentioned (meth)acrylic polymer is, for example, -5°C or lower, preferably -10°C or lower, since it is easy to balance the adhesive performance. If the glass transition temperature is higher than -5°C, the polymer will be difficult to flow, resulting in insufficient wetting of the adherend, which may cause blisters to occur between layers.
  • the glass transition temperature (Tg) of the (meth)acrylic polymer can be adjusted within the above range by appropriately changing the monomer components and composition ratio used.
  • the (meth)acrylic polymer can be produced by appropriately selecting known production methods such as solution polymerization, bulk polymerization, emulsion polymerization, and various radical polymerizations.
  • solution polymerization for example, ethyl acetate, toluene, etc. are used as a polymerization solvent.
  • the reaction is carried out under a stream of inert gas such as nitrogen, and as a polymerization initiator, for example, 0.01 to 0.2 of azobisisobutyronitrile is used per 100 parts by weight of the total amount of monomers. parts by weight, and the reaction is usually carried out at about 50 to 70°C for about 8 to 30 hours.
  • the (meth)acrylic polymer obtained may be a random copolymer, a block copolymer, a graft copolymer, or the like.
  • any appropriate polymerization initiator, chain transfer agent, emulsifier, etc. can be selected and used as necessary.
  • the acrylic pressure-sensitive adhesive composition contains a (meth)acrylic polymer as a base polymer, and preferably further contains a peroxide and an isocyanate crosslinking agent.
  • any peroxide can be used as appropriate, as long as it generates radically active species upon heating or irradiation with light and promotes crosslinking of the base polymer of the adhesive composition.
  • a peroxide having a 1 minute half-life temperature of 80°C to 160°C more preferably a peroxide having a 1 minute half-life temperature of 90°C to 140°C. If the 1-minute half-life temperature is too low, the reaction may progress during storage before coating and drying, increasing the viscosity and making it impossible to apply. On the other hand, if the 1-minute half-life temperature is too high, As the temperature increases, side reactions may occur, and a large amount of unreacted peroxide may remain, resulting in progress of crosslinking over time.
  • Peroxides include di(2-ethylhexyl) peroxydicarbonate (1 minute half-life temperature: 90.6°C), di(4-t-butylcyclohexyl) peroxydicarbonate (1 minute half-life temperature: 92°C).
  • di(4-t-butylcyclohexyl) peroxydicarbonate (1-minute half-life temperature: 92.1°C) and dilauroyl peroxide (1-minute half-life temperature: 116.9°C) have excellent crosslinking reaction efficiency.
  • 4°C), dibenzoyl peroxide (1 minute half-life temperature: 130.0°C), etc. are preferably used.
  • Peroxides may be used alone or in combination of two or more.
  • the half-life of peroxide is an index representing the decomposition rate of peroxide, and refers to the time until the remaining amount of peroxide is reduced to half.
  • the decomposition temperature to obtain a half-life at a given time and the half-life time at a given temperature are described in manufacturer catalogs, etc. For example, the "Organic Peroxide Catalog 9th Edition" by Nippon Oil & Fats Co., Ltd. (May 2003)” etc.
  • the amount of peroxide blended is, for example, 0.02 parts by weight to 2 parts by weight, preferably 0.04 parts by weight to 1.5 parts by weight, more preferably is 0.05 part by weight to 1 part by weight.
  • amount of peroxide is within the above range, a pressure-sensitive adhesive layer with excellent durability and adhesiveness can be obtained.
  • isocyanate-based crosslinking agent examples include aromatic isocyanates such as tolylene diisocyanate and xylene diisocyanate, alicyclic isocyanates such as isophorone diisocyanate, and aliphatic isocyanates such as hexamethylene diisocyanate.
  • isocyanate crosslinking agents may be used alone or in combination of two or more.
  • lower aliphatic polyisocyanates such as butylene diisocyanate and hexamethylene diisocyanate
  • alicyclic isocyanates such as cyclopentylene diisocyanate, cyclohexylene diisocyanate and isophorone diisocyanate
  • 2,4-tolylene diisocyanate 4, Aromatic diisocyanates such as 4'-diphenylmethane diisocyanate, xylylene diisocyanate, and polymethylene polyphenylisocyanate, trimethylolpropane/tolylene diisocyanate trimer adduct (manufactured by Nippon Polyurethane Kogyo Co., Ltd., trade name Coronate L), trimethylolpropane / Isocyanate adducts such as hexamethylene diisocyanate trimer adduct (manufactured by Nippon Polyurethane Kogyo Co., Ltd.
  • the blending amount of the isocyanate crosslinking agent is, for example, 0.02 parts by weight to 2 parts by weight, preferably 0.04 parts by weight to 1.5 parts by weight, based on 100 parts by weight of the (meth)acrylic polymer. More preferably, it is 0.05 part by weight to 1 part by weight.
  • amount of the isocyanate crosslinking agent is within the above range, a pressure-sensitive adhesive layer with excellent cohesive force and adhesiveness can be obtained.
  • the blending amount of the crosslinking agent is such that the gel fraction of the crosslinked adhesive layer is, for example, 45% to 95% by weight, preferably 50% to 90% by weight, more preferably is adjusted to be 55% to 85% by weight.
  • An adhesive layer having a gel fraction within the above range has excellent durability and adhesiveness.
  • the gel fraction (wt%) of the adhesive layer is determined by immersing the dry weight W1 (g) of the adhesive layer in ethyl acetate at about 23°C for 7 days, and then removing the insoluble content of the adhesive layer from ethyl acetate.
  • the weight W2 (g) after being taken out and dried is measured, and may be a value calculated as (W2/W1) ⁇ 100.
  • the gel fraction can be adjusted to a desired range by adjusting the amount of peroxide and isocyanate crosslinking agent, crosslinking temperature, crosslinking time, etc.
  • the crosslinking temperature and crosslinking time are preferably set so that the decomposed amount of peroxide contained in the adhesive composition is 50% by weight or more, more preferably 60% by weight or more. Preferably, it is more preferably set to 70% by weight or more.
  • the crosslinking treatment temperature is 1 minute half-life temperature
  • the amount of peroxide decomposed in 1 minute is 50% by weight
  • the amount of peroxide decomposed in 2 minutes is 75% by weight. Processing time is required.
  • the half-life (half-life time) of peroxide at the cross-linking temperature is 30 seconds
  • a cross-linking time of 30 seconds or more is required; If the (half-life time) is 5 minutes, a crosslinking treatment time of 5 minutes or more is required.
  • the crosslinking treatment temperature and crosslinking treatment time can be calculated theoretically from the half-life (half-life time) assuming that the peroxide is linearly proportional. It can be adjusted as appropriate.
  • the crosslinking treatment temperature is preferably 170°C or lower.
  • the crosslinking treatment time is usually about 0.2 minutes to 20 minutes, preferably about 0.5 minutes to 10 minutes.
  • the crosslinking process may be performed at the temperature during the drying process of the adhesive layer, or a separate crosslinking process may be performed after the drying process.
  • a silane coupling agent may be added to the adhesive composition for the purpose of increasing adhesive strength and durability.
  • the silane coupling agent include 3-glycidoxypropyltrimethoxysilane, 3-glycidoxypropyltriethoxysilane, 3-glycidoxypropylmethyldiethoxysilane, and 2-(3,4-epoxycyclohexyl)ethyltrimethoxysilane.
  • Epoxy group-containing silane coupling agents such as methoxysilane, 3-aminopropyltrimethoxysilane, N-2-(aminoethyl)-3-aminopropylmethyldimethoxysilane, 3-triethoxysilyl-N-(1,3- Silane coupling agents containing amino groups such as dimethylbutylidene) propylamine, silane coupling agents containing (meth)acrylic groups such as 3-acryloxypropyltrimethoxysilane, 3-methacryloxypropyltriethoxysilane, 3-isocyanatepropyl Examples include incyanate group-containing silane coupling agents such as triethoxysilane.
  • the silane coupling agents may be used alone or in combination of two or more.
  • the blending amount of the silane coupling agent is, for example, 0.01 part by weight to 1 part by weight, preferably 0.02 part to 0.6 part by weight, more preferably 0. The amount is .05 parts by weight to 0.3 parts by weight.
  • the above-mentioned pressure-sensitive adhesive composition may further contain any suitable additives, if necessary.
  • additives include surfactants, plasticizers, tackifiers, surface lubricants, leveling agents, softeners, antioxidants, anti-aging agents, light stabilizers, ultraviolet absorbers, polymerization inhibitors, etc. .
  • a reducing agent may be added within a controllable range.
  • the adhesive layer A can be suitably obtained by crosslinking the above adhesive composition.
  • the adhesive layer A obtained by crosslinking the above adhesive composition has a small difference in deformation rate when the temperature rises and when the temperature falls, and even when the layer is made thin, it has durability under high temperature and high humidity conditions. Excellent in sex.
  • the adhesive composition may be crosslinked after being applied to the surface of a desired member (in the configuration of FIG. 1A, the polarizing member, the first retardation member, or the protective member), and may be applied onto a support such as a release liner.
  • the material may be applied to a material, crosslinked, and then transferred to a desired member.
  • the thickness of the adhesive layer A is, for example, 1 ⁇ m or more and 15 ⁇ m or less, preferably 2 ⁇ m or more and less than 10 ⁇ m, and more preferably 3 ⁇ m or more and 8 ⁇ m or less.
  • the optical laminate can include an adhesive layer other than the adhesive layer A described above.
  • Such an adhesive layer may also be formed from any suitable adhesive composition.
  • Adhesive compositions forming adhesive layers other than adhesive layer A include acrylic adhesive compositions, rubber adhesive compositions, silicone adhesive compositions, polyester adhesive compositions, and urethane adhesive compositions. Examples include adhesive compositions, epoxy adhesive compositions, and polyether adhesive compositions. Acrylic pressure-sensitive adhesive compositions are preferably used because they have excellent transparency, heat resistance, and the like.
  • the storage modulus at 25° C. of the adhesive layers other than adhesive layer A is, for example, 5 ⁇ 10 4 Pa or more, preferably 10 ⁇ 10 4 Pa or more, more preferably 14 ⁇ 10 4 Pa or more, for example, 20 ⁇ 10 4 Pa or less, preferably 15 ⁇ 10 4 Pa or less.
  • the thickness of the adhesive layers other than adhesive layer A is, for example, 12 ⁇ m or more and 100 ⁇ m or less, preferably 12 ⁇ m or more and 80 ⁇ m or less.
  • the polarizing member 10 is typically an absorption type polarizing member including a resin film containing a dichroic substance (sometimes referred to as an absorption type polarizing film), and if necessary, a protective layer is provided on one or both sides thereof. may further include.
  • the protective layer is typically bonded to the absorption polarizing film via any suitable adhesive layer.
  • a typical example of the adhesive forming the adhesive layer is an ultraviolet curable adhesive.
  • the cross transmittance (Tc) of the polarizing member (absorbing polarizing film) is preferably 0.5% or less, more preferably 0.1% or less, and still more preferably 0.05% or less.
  • the single transmittance (Ts) of the polarizing member (absorbing polarizing film) is, for example, 41.0% to 45.0%, preferably 42.0% or more.
  • the degree of polarization (P) of the polarizing member (absorbing polarizing film) is, for example, 99.0% to 99.997%, preferably 99.9% or more.
  • the above-mentioned orthogonal transmittance, single transmittance, and degree of polarization can be measured using, for example, an ultraviolet-visible spectrophotometer.
  • the degree of polarization P can be determined by measuring the single transmittance Ts, parallel transmittance Tp, and cross transmittance Tc using an ultraviolet-visible spectrophotometer, and from the obtained Tp and Tc using the following formula.
  • Ts, Tp, and Tc are Y values measured using a 2-degree field of view (C light source) according to JIS Z8701 and subjected to visibility correction.
  • Polarization degree P (%) ⁇ (Tp-Tc)/(Tp+Tc) ⁇ 1/2 ⁇ 100
  • the thickness of the absorption type polarizing film is, for example, 1 ⁇ m or more and 20 ⁇ m or less, may be 2 ⁇ m or more and 15 ⁇ m or less, may be 12 ⁇ m or less, may be 10 ⁇ m or less, or may be 8 ⁇ m or less, It may be 5 ⁇ m or less.
  • the above-mentioned absorption type polarizing film may be produced from a single layer resin film, or may be produced using a laminate of two or more layers.
  • a hydrophilic polymer film such as a polyvinyl alcohol (PVA) film, a partially formalized PVA film, or a partially saponified ethylene/vinyl acetate copolymer film is coated with iodine or dichloromethane.
  • An absorption type polarizing film can be obtained by performing a dyeing treatment with a dichroic substance such as a color dye, a stretching treatment, and the like. Among these, an absorption type polarizing film obtained by dyeing a PVA film with iodine and uniaxially stretching it is preferred.
  • the above-mentioned staining with iodine is performed, for example, by immersing the PVA-based film in an iodine aqueous solution.
  • the stretching ratio of the above-mentioned uniaxial stretching is preferably 3 to 7 times. Stretching may be performed after the dyeing process or may be performed while dyeing. Alternatively, it may be dyed after being stretched. If necessary, the PVA film is subjected to swelling treatment, crosslinking treatment, washing treatment, drying treatment, etc.
  • the laminate produced using the above-mentioned laminate of two or more layers is a laminate of a resin base material and a PVA resin layer (PVA resin film) laminated on the resin base material, or a laminate of a resin base material and a PVA resin layer (PVA resin film) laminated on the resin base material, or Examples include a laminate of a material and a PVA-based resin layer formed by coating on the resin base material.
  • An absorption type polarizing film obtained by using a laminate of a resin base material and a PVA resin layer coated on the resin base material can be obtained by, for example, applying a PVA resin solution to the resin base material, drying it, and applying the resin.
  • a PVA-based resin layer on a base material to obtain a laminate of the resin base material and the PVA-based resin layer; stretching and dyeing the laminate to make the PVA-based resin layer an absorption type polarizing film.
  • a polyvinyl alcohol resin layer containing a halide and a polyvinyl alcohol resin is formed on one side of the resin base material.
  • Stretching typically includes immersing the laminate in an aqueous boric acid solution and stretching.
  • the stretching may further include stretching the laminate in air at a high temperature (for example, 95° C. or higher) before stretching in the boric acid aqueous solution, if necessary.
  • the laminate is preferably subjected to a drying shrinkage treatment in which the laminate is heated while being conveyed in the longitudinal direction to shrink by 2% or more in the width direction.
  • the manufacturing method of this embodiment includes subjecting the laminate to an in-air auxiliary stretching process, a dyeing process, an underwater stretching process, and a drying shrinkage process in this order.
  • the obtained resin base material/absorption type polarizing film laminate may be used as is (that is, the resin base material may be used as a protective layer of the absorption type polarizing film), or the resin base material/absorption type polarizing film laminate may be used as is.
  • Any suitable protective layer depending on the purpose may be laminated on the peeled surface from which the resin base material is peeled off, or on the surface opposite to the peeled surface. Details of the manufacturing method of such an absorption type polarizing film are described in, for example, Japanese Patent Application Publication No. 2012-73580 and Japanese Patent No. 6470455. The entire descriptions of these publications are incorporated herein by reference.
  • the protective layer is formed of any suitable film that can be used as a protective layer of an absorption polarizing film.
  • materials that are the main components of the film include cycloolefin (COP) systems such as polynorbornene systems, polyester systems such as polyethylene terephthalate (PET) systems, cellulose resins such as triacetyl cellulose (TAC), and polycarbonate.
  • COP cycloolefin
  • PET polyethylene terephthalate
  • TAC triacetyl cellulose
  • Examples include transparent resins such as (PC), (meth)acrylic, polyvinyl alcohol, polyamide, polyimide, polyethersulfone, polysulfone, polystyrene, polyolefin, and acetate.
  • thermosetting resins or ultraviolet curable resins such as (meth)acrylic, urethane, (meth)acrylic urethane, epoxy, and silicone resins may also be mentioned.
  • Other examples include glassy polymers such as siloxane polymers.
  • the polymer film described in JP-A-2001-343529 (WO01/37007) can also be used. Materials for this film include, for example, a resin composition containing a thermoplastic resin having a substituted or unsubstituted imide group in its side chain, and a thermoplastic resin having a substituted or unsubstituted phenyl group and nitrile group in its side chain.
  • a resin composition containing an alternating copolymer of isobutene and N-methylmaleimide and an acrylonitrile/styrene copolymer can be used.
  • the polymer film may be, for example, an extrusion molded product of the resin composition.
  • the materials for the resin film can be used alone or in combination.
  • the thickness of the protective layer is typically 100 ⁇ m or less, for example 5 ⁇ m to 80 ⁇ m, preferably 10 ⁇ m to 50 ⁇ m, more preferably 15 ⁇ m to 35 ⁇ m.
  • the first phase difference member 20 includes a first ⁇ /4 member 20a.
  • the angle between the absorption axis of the polarizing member 10 (absorbing polarizing film) and the slow axis of the first ⁇ /4 member 20a is preferably 40° to 50°, more preferably 40° to 50°.
  • the angle is 42° to 48°, for example about 45°.
  • the in-plane retardation Re (550) of the first ⁇ /4 member 20a is, for example, 100 nm to 190 nm, may be 110 nm to 180 nm, may be 130 nm to 160 nm, or may be 135 nm to 155 nm. Good too.
  • the first ⁇ /4 member preferably exhibits inverse dispersion wavelength characteristics in which the retardation value increases depending on the wavelength of the measurement light.
  • Re(450)/Re(550) of the first ⁇ /4 member is, for example, 0.75 or more and less than 1, and may be 0.8 or more and 0.95 or less.
  • the first ⁇ /4 member preferably exhibits a refractive index characteristic of nx>ny ⁇ nz.
  • the Nz coefficient of the first ⁇ /4 member is preferably 0.9 to 3, more preferably 0.9 to 2.5, even more preferably 0.9 to 1.5, and particularly preferably is 0.9 to 1.3.
  • the first ⁇ /4 member is formed of any suitable material that can satisfy the above characteristics.
  • the first ⁇ /4 member may be, for example, a stretched resin film or an oriented solidified layer of a liquid crystal compound.
  • the resins contained in the above resin film include polycarbonate resin, polyester carbonate resin, polyester resin, polyvinyl acetal resin, polyarylate resin, cyclic olefin resin, cellulose resin, polyvinyl alcohol resin, and polyamide resin. , polyimide resin, polyether resin, polystyrene resin, acrylic resin, and the like. These resins may be used alone or in combination. Examples of the combination method include blending and copolymerization. When the first ⁇ /4 member exhibits reverse dispersion wavelength characteristics, a resin film containing a polycarbonate resin or a polyester carbonate resin (hereinafter sometimes simply referred to as a polycarbonate resin) may be suitably used.
  • polycarbonate resins contain structural units derived from fluorene-based dihydroxy compounds, structural units derived from isosorbide-based dihydroxy compounds, alicyclic diols, alicyclic dimethanols, di-, tri-, or polyethylene glycols, and alkylene-based dihydroxy compounds. a structural unit derived from at least one dihydroxy compound selected from the group consisting of glycol or spiroglycol.
  • the polycarbonate resin contains a structural unit derived from a fluorene dihydroxy compound, a structural unit derived from an isosorbide dihydroxy compound, a structural unit derived from an alicyclic dimethanol, and/or a di, tri, or polyethylene glycol. More preferably, it contains a structural unit derived from a fluorene dihydroxy compound, a structural unit derived from an isosorbide dihydroxy compound, and a structural unit derived from di, tri or polyethylene glycol. .
  • the polycarbonate resin may contain structural units derived from other dihydroxy compounds as necessary.
  • the thickness of the first ⁇ /4 member made of a stretched resin film is, for example, 10 ⁇ m to 100 ⁇ m, preferably 10 ⁇ m to 70 ⁇ m, and more preferably 20 ⁇ m to 60 ⁇ m.
  • the liquid crystal compound alignment and solidification layer is a layer in which the liquid crystal compound is aligned in a predetermined direction within the layer, and the alignment state is fixed.
  • the "alignment hardened layer” is a concept that includes an orientation hardened layer obtained by curing a liquid crystal monomer as described below.
  • rod-shaped liquid crystal compounds are typically aligned in the slow axis direction of the first ⁇ /4 member (homogeneous alignment).
  • Examples of rod-shaped liquid crystal compounds include liquid crystal polymers and liquid crystal monomers.
  • the liquid crystal compound is preferably polymerizable. If the liquid crystal compound is polymerizable, the alignment state of the liquid crystal compound can be fixed by aligning the liquid crystal compound and then polymerizing it.
  • the liquid crystal compound alignment and solidification layer is produced by subjecting the surface of a predetermined base material to an alignment treatment, applying a coating liquid containing the liquid crystal compound to the surface, and subjecting the liquid crystal compound to the alignment treatment. It can be formed by orienting it in a corresponding direction and fixing the orientation state. Any suitable orientation treatment may be employed as the orientation treatment. Specifically, mechanical alignment treatment, physical alignment treatment, and chemical alignment treatment can be mentioned. Specific examples of mechanical alignment treatment include rubbing treatment and stretching treatment. Specific examples of physical alignment treatment include magnetic field alignment treatment and electric field alignment treatment. Specific examples of chemical alignment treatment include oblique vapor deposition and photo alignment treatment. As the treatment conditions for various orientation treatments, any appropriate conditions may be adopted depending on the purpose.
  • the alignment of the liquid crystal compound is carried out by treatment at a temperature that exhibits a liquid crystal phase depending on the type of liquid crystal compound.
  • the liquid crystal compound assumes a liquid crystal state, and the liquid crystal compound is oriented in accordance with the orientation treatment direction of the substrate surface.
  • the alignment state is fixed by cooling the liquid crystal compound aligned as described above.
  • the alignment state is fixed by subjecting the liquid crystal compound aligned as described above to polymerization treatment or crosslinking treatment.
  • liquid crystal compound any suitable liquid crystal polymer and/or liquid crystal monomer can be used as the liquid crystal compound.
  • the liquid crystal polymer and the liquid crystal monomer may be used alone or in combination.
  • Specific examples of liquid crystal compounds and methods for producing liquid crystal alignment solidified layers are described in, for example, JP 2006-163343A, JP 2006-178389A, and WO 2018/123551A. The descriptions of these publications are incorporated herein by reference.
  • the thickness of the first ⁇ /4 member composed of the liquid crystal alignment solidified layer is, for example, 1 ⁇ m to 10 ⁇ m, preferably 1 ⁇ m to 8 ⁇ m, more preferably 1 ⁇ m to 6 ⁇ m, and still more preferably 1 ⁇ m to 4 ⁇ m. be.
  • Protective member 30 typically includes a base material.
  • the substrate may be comprised of any suitable film.
  • Materials that are the main components of the film constituting the base material include, for example, cellulose resins such as triacetyl cellulose (TAC), polyesters, polyvinyl alcohols, polycarbonates, polyamides, polyimides, polyethersulfones, Examples include polysulfone-based, polystyrene-based, cycloolefin-based resins such as polynorbornene, polyolefin-based resins, (meth)acrylic-based resins, and acetate-based resins.
  • the thickness of the base material is preferably 5 ⁇ m to 80 ⁇ m, more preferably 10 ⁇ m to 40 ⁇ m, and even more preferably 15 ⁇ m to 35 ⁇ m.
  • the protective member preferably has a base material and a surface treatment layer formed on the base material.
  • the surface treatment layer may be located on the outermost surface of the optical laminate 100a.
  • the surface treatment layer may have any suitable function. Examples of the surface treatment layer include a hard coat layer, an antireflection layer, an antisticking layer, and an antiglare layer.
  • the protective member may have two or more surface treatment layers.
  • the antireflection layer is provided to prevent reflection of external light and the like.
  • the antireflection layer include a fluororesin layer, a resin layer containing nanoparticles (typically hollow nanoparticles, such as hollow nanosilica particles), or an antireflection layer having a nanostructure (e.g. moth-eye structure). .
  • the thickness of the antireflection layer is preferably 0.05 ⁇ m to 1 ⁇ m.
  • methods for forming the resin layer include a sol-gel method, a thermosetting method using isocyanate, and an ionizing radiation curing method using a crosslinking monomer (e.g., polyfunctional acrylate) and a photopolymerization initiator (typically a photopolymerization method). curing method).
  • the hard coat layer preferably has sufficient surface hardness, excellent mechanical strength, and excellent light transparency.
  • the hard coat layer may be formed from any suitable resin.
  • the hard coat layer is typically formed from an ultraviolet curable resin. Examples of the ultraviolet curable resin include polyester, acrylic, urethane, amide, silicone, and epoxy resins.
  • the thickness of the hard coat layer is, for example, 0.5 ⁇ m or more, preferably 1 ⁇ m or more, and, for example, 20 ⁇ m or less, preferably 15 ⁇ m or less.
  • FIG. 1B is a schematic cross-sectional view of an optical laminate according to one embodiment of the invention.
  • the angle between the absorption axis of the polarizing member 10 and the slow axis of the first ⁇ /4 member 20a is preferably 40° to 50°, more preferably 42° to 48°, for example about 45°. It is located.
  • the first retardation member 20 has a laminated structure of a first ⁇ /4 member 20a and a positive C plate 20b. Specifically, the first ⁇ /4 member 20a and the positive C plate 20b are laminated with an adhesive layer b1 in between. As shown in the illustrated example, it is preferable that the first ⁇ /4 member 20a is located closer to the polarizing member 10 than the positive C plate 20b, but these arrangements may be reversed.
  • the adhesive layer b1 is typically a pressure-sensitive adhesive layer or an adhesive layer. When the adhesive layer b1 is an adhesive layer, the total number of adhesive layers in the optical laminate 100b is three, two or more of which are adhesive layers A, and preferably all three are adhesive layers. This is agent layer A.
  • the adhesive layer b1 is an adhesive layer
  • the total number of adhesive layers in the optical laminate 100b is 4, and in this case also, two or more adhesive layers are the above-mentioned adhesive layer A, preferably three or more. More preferably, all four adhesive layers are adhesive layers A.
  • the adhesive layer is formed of, for example, an ultraviolet curing adhesive, and has a thickness of, for example, 0.05 ⁇ m to 30 ⁇ m.
  • the thickness of the optical laminate 100b is, for example, 100 ⁇ m or more and 300 ⁇ m or less, preferably 110 ⁇ m or more and 250 ⁇ m or less, and more preferably 120 ⁇ m or more and 200 ⁇ m or less.
  • the adhesive layer, polarizing member, first ⁇ /4 member, and protective member are as described in Section A-1.
  • the retardation Rth (550) in the thickness direction of the positive C plate 20b is preferably -50 nm to -300 nm, more preferably -70 nm to -250 nm, still more preferably -90 nm to -200 nm, and particularly preferably is ⁇ 100 nm to ⁇ 180 nm.
  • the in-plane retardation Re (550) of the positive C plate is, for example, less than 10 nm.
  • the positive C-plate may be formed of any suitable material.
  • the positive C-plate preferably consists of a film containing liquid crystal material fixed in a homeotropic orientation.
  • the liquid crystal material (liquid crystal compound) that can be homeotropically aligned may be a liquid crystal monomer or a liquid crystal polymer.
  • Specific examples of methods for forming such liquid crystal compounds and positive C plates include methods for forming liquid crystal compounds and retardation layers described in [0020] to [0028] of JP-A No. 2002-333642.
  • the thickness of the positive C plate is preferably 0.5 ⁇ m to 5 ⁇ m.
  • FIG. 2 is a schematic diagram showing a schematic configuration of an example of a display system (goggles with a display) including the optical laminate described in Section A. 2(a) schematically shows the arrangement and shape of the main components of the display system 2, and FIG. 2(b) shows that the display system 2 shown in FIG. 2(a) is a liquid crystal display system. It is a schematic diagram explaining arrangement
  • the display system 2 includes a display element 12, a reflective polarizing member 14, a first lens section 16, a half mirror 18, a first retardation member 20, and a second retardation member 20. It includes a retardation member 22 and a second lens portion 24.
  • the reflective polarizing member 14 is disposed in front of the display element 12 on the display surface 12' side, and can reflect light emitted from the display element 12.
  • the first lens section 16 is arranged on the optical path between the display element 12 and the reflective polarizing member 14, and the half mirror 18 is arranged between the display element 12 and the first lens section 16.
  • the first retardation member 20 is arranged on the optical path between the display element 12 and the half mirror 18, and the second retardation member 22 is arranged on the optical path between the half mirror 18 and the reflective polarizing member 14.
  • the display system 2 may further include an absorptive polarizing member between the reflective polarizing member 14 and the second lens section 24.
  • the components disposed in front of the half mirror are collectively assembled into a lens section ( It may also be referred to as a lens section 4).
  • the display element 12 is, for example, a liquid crystal display or an organic EL display, and has a display surface 12' for displaying images.
  • the light emitted from the display surface 12' passes through, for example, a polarizing member 10 that may be included in the display element 12, and is emitted as first linearly polarized light.
  • the first retardation member 20 includes a first ⁇ /4 member that can convert the first linearly polarized light incident on the first retardation member 20 into first circularly polarized light.
  • the first retardation member may correspond to the first ⁇ /4 member.
  • the half mirror 18 transmits the light emitted from the display element 12 and reflects the light reflected by the reflective polarizing member 14 toward the reflective polarizing member 14.
  • the half mirror 18 is provided integrally with the first lens section 16.
  • the second retardation member 22 includes a second ⁇ /4 member that can transmit the light reflected by the reflective polarizing member 14 and the half mirror 18 through the reflective polarizing member 14.
  • the second retardation member may correspond to the second ⁇ /4 member.
  • the second retardation member 22 may be provided integrally with the first lens portion 16.
  • the first circularly polarized light emitted from the first ⁇ /4 member included in the first retardation member 20 passes through the half mirror 18 and the first lens portion 16, and The second ⁇ /4 member converts the light into a second linearly polarized light.
  • the second linearly polarized light emitted from the second ⁇ /4 member is reflected toward the half mirror 18 without passing through the reflective polarizing member 14.
  • the polarization direction of the second linearly polarized light incident on the reflective polarizing member 14 is the same direction as the reflection axis of the reflective polarizing member 14. Therefore, the second linearly polarized light incident on the reflective polarizing member 14 is reflected by the reflective polarizing member 14.
  • the second linearly polarized light reflected by the reflective polarizing member 14 is converted into second circularly polarized light by the second ⁇ /4 member included in the second retardation member 22, and is emitted from the second ⁇ /4 member.
  • the second circularly polarized light passes through the first lens section 16 and is reflected by the half mirror 18.
  • the second circularly polarized light reflected by the half mirror 18 passes through the first lens section 16 and is converted into third linearly polarized light by the second ⁇ /4 member included in the second retardation member 22.
  • the third linearly polarized light is transmitted through the reflective polarizing member 14 .
  • the polarization direction of the third linearly polarized light incident on the reflective polarizing member 14 is the same direction as the transmission axis of the reflective polarizing member 14. Therefore, the third linearly polarized light incident on the reflective polarizing member 14 is transmitted through the reflective polarizing member 14.
  • the display system 2 may include an absorbing polarizing member (typically, an absorbing polarizing film) in front of the reflective polarizing member 14 (on the side closer to the eyes).
  • the reflection axis of the reflective polarizing member 14 and the absorption axis of the absorptive polarizing member may be arranged substantially parallel to each other, and the transmission axis of the reflective polarizing member and the transmission axis of the absorptive polarizing member may be arranged substantially parallel to each other.
  • the third linearly polarized light that has passed through the reflective polarizing member 14 can pass through the absorbing polarizing member as it is.
  • the reflective polarizing member and the absorbing polarizing member may be laminated with an adhesive layer interposed therebetween.
  • the light transmitted through the reflective polarizing member 14 passes through the second lens section 24 and enters the user's eyes 26.
  • the absorption axis of the polarizing member 10 and the reflection axis of the reflective polarizing member 14 included in the display element 12 may be arranged substantially parallel to each other, or may be arranged substantially perpendicular to each other.
  • the angle between the absorption axis of the polarizing member 10 included in the display element 12 and the slow axis of the first ⁇ /4 member included in the first retardation member 20 is, for example, 40° to 50°, and 42°. ⁇ 48°, and may be about 45°.
  • the angle between the absorption axis of the polarizing member 10 included in the display element 12 and the slow axis of the second ⁇ /4 member included in the second retardation member 22 is, for example, 40° to 50°, and 42°. ⁇ 48°, and may be about 45°.
  • the polarizing member 10 and the first retardation member 20 including the first ⁇ /4 member are each as described in Section A.
  • the in-plane retardation Re (550) of the second ⁇ /4 member is, for example, 100 nm to 190 nm, may be 110 nm to 180 nm, may be 130 nm to 160 nm, or may be 135 nm to 155 nm. good.
  • the second ⁇ /4 member preferably exhibits inverse dispersion wavelength characteristics in which the retardation value increases depending on the wavelength of the measurement light.
  • the second ⁇ /4 member preferably satisfies the relationship Re(450) ⁇ Re(550) ⁇ Re(650).
  • Re(450)/Re(550) of the second ⁇ /4 member is, for example, 0.75 or more and less than 1, and may be 0.8 or more and 0.95 or less.
  • FIG. 2(b) shows the arrangement of the optical laminate when the display system 2 is a liquid crystal display system.
  • the optical laminate 100 optical laminates 100a and 100b shown in FIG. 1A or 1B are preferably used.
  • the display element 12 includes a backlight unit 12a, a backlight-side polarizing member 12b, a liquid crystal cell 12c, and a polarizing member 10.
  • the backlight side polarizing member 12b and the polarizing member 10 are typically arranged so that their absorption axes are substantially orthogonal to each other, and together with the liquid crystal cell 12c, they constitute a liquid crystal panel.
  • the optical laminate 100 is disposed on the display element 12 side of the half mirror 18, where the polarizing member 10 is bonded to the liquid crystal cell 12c via the adhesive layer a1, and the first retardation The member 20 (first ⁇ /4 member) is bonded to the polarizing member 10 via the adhesive layer a2, and as a result, the display element 12 and the first retardation member 20 (first ⁇ /4 member) ) are integrated. Furthermore, by arranging the protective member 30 having a surface-treated layer such that the surface-treated layer is on the outermost surface, a space is formed between the half mirror 18 and the first retardation member 20 (protective member 30). Excellent anti-reflection effects can be obtained in display systems that use this technology.
  • the optical laminate 100 is bonded to a liquid crystal cell, but the optical laminate according to the embodiment of the present invention can also constitute an organic EL display system together with an organic EL panel.
  • a third retardation member including a third ⁇ /4 member may be disposed between the optical laminate 100 and the organic EL panel.
  • the third retardation member may be included in the optical laminate according to the embodiment of the present invention.
  • the optical laminate according to the embodiment of the present invention may include a third retardation member, a polarizing member, a first retardation member, and a protection member in this order via an adhesive layer.
  • the optical laminate has a configuration of [adhesive layer/third retardation member/adhesive layer/polarizing member/adhesive layer/first retardation member/adhesive layer/protective member]. and in such a configuration may include at least four adhesive layers. When the total number of adhesive layers is four, adhesive layer A is used for two or more of them, preferably three or four adhesive layers.
  • the in-plane retardation Re (550) of the third ⁇ /4 member is, for example, 100 nm to 190 nm, may be 110 nm to 180 nm, may be 130 nm to 160 nm, or may be 135 nm to 155 nm. good.
  • the same explanation as for the first ⁇ /4 member can be applied to the third ⁇ /4 member.
  • the third retardation member is configured such that the slow axis of the third ⁇ /4 member makes an angle of, for example, 40° to 50°, 42° to 48°, or about 45° with the absorption axis of the polarizing member 10. may be placed.
  • the thickness is a value measured by the following measuring method.
  • ⁇ Thickness> The thickness of 10 ⁇ m or less was measured using a scanning electron microscope (manufactured by JEOL Ltd., product name “JSM-7100F”). Thickness exceeding 10 ⁇ m was measured using a digital micrometer (manufactured by Anritsu Corporation, product name “KC-351C”).
  • ⁇ Analyzer Tosoh Corporation, HLC-8120GPC ⁇ Data processing device: Tosoh Corporation, GPC-8020 ⁇ Column: Manufactured by Tosoh Corporation, G7000HXL-H+GMHXL+GMHXL ⁇ Column size: each 7.8 mm ⁇ x 30 cm (total 90 cm) ⁇ Flow rate: 0.8ml/min ⁇ Injected sample concentration: Approximately 0.1% by weight ⁇ Injection volume: 100 ⁇ l ⁇ Column temperature: 40°C ⁇ Eluent: Tetrahydrofuran ⁇ Detector: Differential refractometer (RI)
  • Acrylic adhesive solution 1 was prepared by mixing 0.6 parts by weight of a polyisocyanate crosslinking agent (Coronate L, manufactured by Nippon Polyurethane Industries, Ltd.).
  • Acrylic adhesive solution 1 was applied to one side of a silicone-treated polyethylene terephthalate (PET) film (manufactured by Mitsubishi Chemical Polyester Film Co., Ltd., thickness: 38 ⁇ m), and dried and crosslinked at 150 ° C. for 3 minutes. An adhesive layer 1 having a thickness of 5 ⁇ m after drying was formed.
  • PET polyethylene terephthalate
  • the polymerization reaction was carried out for 7 hours while maintaining the liquid temperature in the flask at 60°C. Next, ethyl acetate was added to the resulting reaction solution to adjust the solid content concentration to 30% by weight to obtain a solution of acrylic polymer 2.
  • the weight average molecular weight of acrylic polymer 2 was 2.2 million.
  • ⁇ Adhesive solution 2> Based on 100 parts by weight of the solid content of the solution of acrylic polymer 2, 0.6 parts by weight of a polyisocyanate crosslinking agent (trimethylolpropane/tolylene diisocyanate adduct, Coronate L, manufactured by Nippon Polyurethane Kogyo Co., Ltd.) and silane coupling.
  • Acrylic pressure-sensitive adhesive solution 2 was prepared by mixing 0.075 parts by weight of an adhesive (manufactured by Shin-Etsu Chemical Co., Ltd., KBM403).
  • Acrylic adhesive solution 2 was applied to one side of a silicone-treated polyethylene terephthalate (PET) film (manufactured by Mitsubishi Chemical Polyester Film Co., Ltd., thickness: 38 ⁇ m), and dried at a predetermined temperature to form a film with a thickness of 12 ⁇ m and 15 ⁇ m. , or a 20 ⁇ m adhesive layer 2 was formed.
  • PET polyethylene terephthalate
  • the dyeing process was carried out in an aqueous solution at 30°C in which the weight ratio of iodine and potassium iodide was 1:7, and the iodine concentration was adjusted so that the single transmittance of the obtained absorption type polarizing film was 45.0%. It was stretched 1.4 times during processing. Furthermore, a two-stage crosslinking process was adopted for the crosslinking process, and the first crosslinking process was performed in an aqueous solution containing boric acid and potassium iodide at 40°C, and was stretched to 1.2 times.
  • the boric acid content of the aqueous solution for the first stage crosslinking treatment was 5.0% by weight, and the potassium iodide content was 3.0% by weight.
  • the film was stretched to 1.6 times while being treated in an aqueous solution containing boric acid and potassium iodide at 65°C.
  • the boric acid content of the aqueous solution for the second stage crosslinking treatment was 4.3% by weight, and the potassium iodide content was 5.0% by weight.
  • the cleaning treatment was performed using a potassium iodide aqueous solution at 20°C.
  • the potassium iodide content of the aqueous solution for cleaning treatment was 2.6% by weight.
  • the drying process was carried out at 70° C. for 5 minutes to obtain an absorption type polarizing film.
  • a triacetyl cellulose (TAC) resin film (thickness: 22 ⁇ m) as a protective layer was bonded to both sides of the obtained absorption polarizing film via an ultraviolet curable adhesive.
  • an ultraviolet curable adhesive was applied so that the total thickness was about 1 ⁇ m, and the pieces were bonded together using a roll machine. Thereafter, UV light was irradiated from the TAC film side to cure the adhesive.
  • a polarizing film 1 (thickness: 57 ⁇ m) having a configuration of [TAC film (protective layer)/absorption type polarizing film/TAC film (protective layer)] was obtained.
  • the oligomerized reaction liquid in the first reactor was transferred to the second reactor.
  • temperature increase and pressure reduction in the second reactor were started, and the internal temperature was 240° C. and the pressure was 0.2 kPa in 50 minutes.
  • polymerization was allowed to proceed until a predetermined stirring power was reached.
  • nitrogen was introduced into the reactor to restore the pressure nitrogen was introduced into the reactor to restore the pressure, the produced polyester carbonate resin was extruded into water, and the strands were cut to obtain pellets.
  • polyester carbonate resin pellets
  • a single-screw extruder manufactured by Toshiba Machine Co., Ltd., cylinder temperature setting: 250°C
  • T-die width 200mm, setting temperature: 250°C
  • a long resin film with a thickness of 135 ⁇ m was produced using a film forming apparatus equipped with a chill roll (set temperature: 120 to 130° C.), a winder and a winder.
  • the obtained elongated resin film was stretched in the width direction at a stretching temperature of 143° C. and a stretching ratio of 2.8 times. Thereby, a stretched film ( ⁇ /4 member 1) having a thickness of 51 ⁇ m was obtained.
  • Re(590) of ⁇ /4 member 1 was 143 nm
  • Re(450)/Re(550) was 0.86
  • the Nz coefficient was 1.12.
  • a leveling agent By adding 0.5% by weight of a leveling agent to acrylic resin raw material (manufactured by Dainippon Ink Co., Ltd., product name: GRANDIC PC1071), and further diluting with ethyl acetate so that the solid content concentration is 50% by weight, A material for forming a hard coat layer was prepared.
  • Anti-reflection layer forming material 100 parts by weight of polyfunctional acrylate whose main component is pentaerythritol triacrylate (manufactured by Osaka Organic Chemical Industry Co., Ltd., product name "Viscoat #300", solid content 100% by weight), hollow nano silica particles (JGC Catalysts & Chemicals Co., Ltd.) 100 parts by weight, solid nano silica particles (manufactured by Nissan Chemical Industries, Ltd., trade name "MEK-2140Z-AC", solid content 20% by weight, weight average particle diameter 75 nm), solid content 30% (wt%, weight average particle diameter 10 nm), 12 parts by weight of a fluorine-containing additive (manufactured by Shin-Etsu Chemical Co., Ltd., trade name "KY-1203", solid content 20 wt%), and a photopolymerization initiator (manufactured by BASF, 3 parts by weight of the product (trade name "OMNIRAD907", solid content 100% by
  • a mixed solvent of tertiary butyl alcohol, methyl isobutyl ketone, and propylene glycol monomethyl ether acetate in a 60:25:15 weight ratio was added to the mixture so that the total solid content was 4% by weight, and the mixture was stirred.
  • An antireflection layer forming material was prepared.
  • Adhesive layer 1 (thickness 5 ⁇ m) is pasted together with the PET film on one side of polarizing film 1, another adhesive layer 1 (thickness 5 ⁇ m) is transferred from the PET film to the other side, and ⁇ /4 Member 1 was pasted together. At this time, the arrangement was such that the angle between the absorption axis of the absorption type polarizing film and the slow axis of the ⁇ /4 member 1 was 45°. Next, another adhesive layer 1 (thickness: 5 ⁇ m) was transferred from the PET film onto the surface of the ⁇ /4 member 1, and the protective member 1 was bonded thereon.
  • Example 2 Comparative Example 1-2
  • An optical laminate was obtained in the same manner as in Example 1 except that one or more of the three adhesive layers 1 was replaced with the adhesive layer 2.
  • Table 1 shows the configuration of each optical laminate.
  • the present invention is not limited to the above embodiments, and various modifications are possible.
  • it can be replaced with a configuration that is substantially the same as the configuration shown in the above embodiment, a configuration that has the same effect, or a configuration that can achieve the same objective.
  • optical laminate according to the embodiment of the present invention can be used, for example, to manufacture goggles with a display such as VR goggles.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Nonlinear Science (AREA)
  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Ophthalmology & Optometry (AREA)
  • Mathematical Physics (AREA)
  • General Health & Medical Sciences (AREA)
  • Theoretical Computer Science (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Manufacturing & Machinery (AREA)
  • Adhesives Or Adhesive Processes (AREA)
  • Laminated Bodies (AREA)
  • Polarising Elements (AREA)

Abstract

La présente invention concerne un stratifié optique qui présente des caractéristiques optiques stables même dans des environnements hostiles. Selon un mode de réalisation de la présente invention, un stratifié optique comprend au moins un élément optique et au moins une couche adhésive. Lorsque N est le nombre total de couches adhésives incluses dans le stratifié optique, α1 est le coefficient de dilatation linéaire lors du chauffage de 20 °C à 30 °C, et α2 est le coefficient de dilatation linéaire lors du refroidissement de 30 °C à 20 °C, au moins N/2 des couches adhésives sont une couche adhésive A qui satisfait à 0,8 ≤ α1/α2 ≤ 1,2.
PCT/JP2023/008813 2022-03-14 2023-03-08 Stratifié optique et système d'affichage WO2023176628A1 (fr)

Applications Claiming Priority (28)

Application Number Priority Date Filing Date Title
JP2022039286 2022-03-14
JP2022-039286 2022-03-14
JP2022-039285 2022-03-14
JP2022039285 2022-03-14
JP2022077677A JP2023166852A (ja) 2022-05-10 2022-05-10 レンズ部、積層体、表示体、表示体の製造方法および表示方法
JP2022077632A JP7516455B2 (ja) 2022-05-10 2022-05-10 レンズ部、積層体、表示体、表示体の製造方法および表示方法
JP2022-077677 2022-05-10
JP2022077676A JP2023166851A (ja) 2022-05-10 2022-05-10 レンズ部、積層体、表示体、表示体の製造方法および表示方法
JP2022077658A JP2023166840A (ja) 2022-05-10 2022-05-10 表示システム、表示方法、表示体および表示体の製造方法
JP2022077657A JP2023134317A (ja) 2022-03-14 2022-05-10 表示システム、表示方法、表示体および表示体の製造方法
JP2022077631A JP2023134316A (ja) 2022-03-14 2022-05-10 レンズ部、積層体、表示体、表示体の製造方法および表示方法
JP2022077634A JP7516457B2 (ja) 2022-05-10 2022-05-10 レンズ部、積層体、表示体、表示体の製造方法および表示方法
JP2022-077679 2022-05-10
JP2022077679A JP7516458B2 (ja) 2022-05-10 2022-05-10 レンズ部、積層体、表示体、表示体の製造方法および表示方法
JP2022077659A JP2023166841A (ja) 2022-05-10 2022-05-10 表示システム、表示方法、表示体および表示体の製造方法
JP2022-077678 2022-05-10
JP2022-077632 2022-05-10
JP2022-077659 2022-05-10
JP2022-077657 2022-05-10
JP2022-077634 2022-05-10
JP2022077633A JP7516456B2 (ja) 2022-05-10 2022-05-10 表示方法
JP2022-077676 2022-05-10
JP2022-077631 2022-05-10
JP2022-077633 2022-05-10
JP2022077678A JP2023166853A (ja) 2022-05-10 2022-05-10 レンズ部、積層体、表示体、表示体の製造方法および表示方法
JP2022-077658 2022-05-10
JP2022-212221 2022-12-28
JP2022212221A JP2024095149A (ja) 2022-12-28 2022-12-28 光学積層体および表示システム

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007138147A (ja) * 2005-10-18 2007-06-07 Nitto Denko Corp 粘着剤組成物、粘着剤層およびその製造方法、ならびに粘着剤付光学部材
KR20170120853A (ko) * 2016-04-22 2017-11-01 삼성에스디아이 주식회사 점착필름, 이를 포함하는 광학부재 및 이를 포함하는 광학표시장치
JP2019526075A (ja) * 2016-08-02 2019-09-12 アップル インコーポレイテッドＡｐｐｌｅ Ｉｎｃ． ヘッドマウントディスプレイ用光学システム

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007138147A (ja) * 2005-10-18 2007-06-07 Nitto Denko Corp 粘着剤組成物、粘着剤層およびその製造方法、ならびに粘着剤付光学部材
KR20170120853A (ko) * 2016-04-22 2017-11-01 삼성에스디아이 주식회사 점착필름, 이를 포함하는 광학부재 및 이를 포함하는 광학표시장치
JP2019526075A (ja) * 2016-08-02 2019-09-12 アップル インコーポレイテッドＡｐｐｌｅ Ｉｎｃ． ヘッドマウントディスプレイ用光学システム

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