WO2022209937A1 - Élément optique, stratifié et dispositif d'affichage d'image - Google Patents

Élément optique, stratifié et dispositif d'affichage d'image Download PDF

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Publication number
WO2022209937A1
WO2022209937A1 PCT/JP2022/012180 JP2022012180W WO2022209937A1 WO 2022209937 A1 WO2022209937 A1 WO 2022209937A1 JP 2022012180 W JP2022012180 W JP 2022012180W WO 2022209937 A1 WO2022209937 A1 WO 2022209937A1
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group
optical element
liquid crystal
mass
crystal compound
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PCT/JP2022/012180
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English (en)
Japanese (ja)
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直良 山田
渉 星野
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富士フイルム株式会社
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Publication of WO2022209937A1 publication Critical patent/WO2022209937A1/fr

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    • 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
    • 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
    • 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
    • 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

Definitions

  • the present invention relates to optical elements, laminates, and image display devices.
  • Image display devices are used in a variety of situations, and depending on their use, it may be necessary to prevent others from looking into them or to control viewing angles, such as the reflection of images.
  • an in-vehicle display such as a car navigation system
  • Patent Document 1 discloses a film in which a polarizer having an absorption axis in the in-plane direction and a light absorption anisotropic layer in which a dichroic material is vertically aligned is combined, and a display device provided with this film. describes that a good dark state is achieved in any orientation.
  • An object of the present invention is to provide an optical element that, when applied to a display device that requires viewing angle control, has higher viewing angle controllability with respect to the azimuth angle, such as making it invisible from a specific azimuth angle.
  • Another object of the present invention is to provide a laminate and an image display device.
  • an optical element is formed using a composition containing a rod-like liquid crystal compound having a polymerizable group and a dichroic substance; The optical element according to (1) or (2), which is obtained by polymerizing a polymerizable group in a rod-like liquid crystal compound having a polymerizable group twisted along the helical axis.
  • a laminate comprising the optical element according to any one of (1) to (4) and a polarizer.
  • An image display device comprising the optical element according to any one of (1) to (4).
  • the image display device according to (6) including a self-luminous display device and an optical element arranged on the viewing side of the self-luminous display device.
  • a laminated body and an image display apparatus when applied to a display device that requires viewing angle control, it is possible to provide an optical element that has higher viewing angle controllability with respect to azimuth angle, such as making it invisible from a specific azimuth angle.
  • a laminated body and an image display apparatus can be provided.
  • FIG. 1 is a sectional view conceptually showing an example of an optical element of the present invention
  • FIG. FIG. 2 is a plan view of the optical element shown in FIG. 1
  • FIG. 4 is a cross-sectional view showing the state of a dichroic substance in an optical element
  • FIG. 4 is a cross-sectional view conceptually showing another example of the optical element of the present invention.
  • FIG. 4 is a diagram for explaining a method of evaluating reflection
  • a numerical range represented by "-" means a range including the numerical values before and after "-" as lower and upper limits.
  • parallel does not mean parallel in a strict sense, but means a range of ⁇ 5° from parallel.
  • orthogonal does not mean orthogonal in a strict sense, but means a range of ⁇ 5° from orthogonal.
  • (meth)acrylic is used to mean “one or both of acrylic and methacrylic".
  • (Meth)acryloyl is used in the sense of "one or both of acryloyl and methacryloyl”.
  • the bonding direction of the divalent group (e.g., -COO-) described herein is not particularly limited. For example, when L in XLY is -COO-, If the position where *1 is attached and *2 is the position where the good too.
  • a feature of the optical element of the present invention is that the liquid crystal compound twisted along the helical axis, which forms a predetermined angle with the normal to the surface of the optical element, is fixed in the optical element.
  • the dichroic substance tends to be aligned along the liquid crystal compound, so most of the dichroic substance is arranged in a twisted orientation similar to the liquid crystal compound. Therefore, in the optical element, the long axis directions of the dichroic substances are oriented in various directions, and as a result, when the optical element is viewed from various directions, the long axes of the dichroic substances cross each other. It is easy to be arranged to be aligned, and has excellent light shielding properties in various directions.
  • FIG. 1 shows a cross-sectional view conceptually showing an example of the optical element of the present invention.
  • FIG. 2 shows a plan view of the optical element shown in FIG.
  • the plan view is a view of the optical element 10A viewed from above in FIG. 1 is a cross-sectional view taken along line A--A in FIG.
  • direction X and direction Z indicate directions of two coordinate axes orthogonal to each other on the viewing plane.
  • the direction Z is parallel to the thickness direction of the optical element 10A.
  • direction X and direction Y indicate directions of two coordinate axes orthogonal to each other on the viewing plane.
  • the optical element 10A contains therein a liquid crystal compound 12 and a dichroic substance (not shown).
  • the optical element 10A includes a liquid crystal compound 12 that is twisted and fixed along a helical axis parallel to the horizontal direction (X direction) of the paper. That is, as shown in FIGS. 1 and 2, the spiral axis is parallel along the direction indicated by the white arrow (X direction).
  • the twisted alignment is an alignment in which the molecular axis of the liquid crystal compound (the long axis in the rod-like liquid crystal compound) rotates along the helical axis. It is a kind of twisted orientation.
  • the "fixed" state is a state in which the orientation of the liquid crystal compound is maintained.
  • the layer does not have fluidity in the temperature range of 0 to 50° C., and -30 to 70° C. under more severe conditions, and the orientation is changed by an external field or force. It is preferable to be in a state in which the fixed alignment form can be stably maintained.
  • the "fixing" is preferably achieved by polymerizing the polymerizable group using a liquid crystal compound having a polymerizable group.
  • the state in which the liquid crystal compound is fixed can be formed by polymerizing the polymerizable group in the liquid crystal compound having the polymerizable group twisted along the helical axis.
  • the liquid crystal compound 12 is a rod-like liquid crystal compound.
  • the helical axis is perpendicular (90°) to the normal direction of the surface of the optical element 10A.
  • the helical axis is orthogonal to the thickness direction of the optical element 10A. 1 and 2, the helical axis is perpendicular to the normal direction of the surface of the optical element 10A. ⁇ 90° is sufficient.
  • the spiral axis indicated by the hollow arrow is inclined with respect to the surface of the optical element 10B.
  • the angle formed by the helical axis and the normal direction of the surface of the optical element is preferably 30 to 90°, in that when the optical element is applied to a display panel, the shielding property in the oblique direction of the display surface is more excellent. , 45-90° is more preferred.
  • the angle between the helical axis of the liquid crystal compound (hereinafter also referred to as "first helical axis") and the normal direction of the surface of the optical element can be measured by the following method. Specifically, first, the direction in which the first spiral axis extends when observed from the surface of the optical element (the direction of the white arrow in FIGS. 1 and 2) is specified.
  • the surface (principal surface) of the optical element is observed with a scanning electron microscope (SEM), and the direction in which the linear bright portions and linear dark portions derived from the twisted orientation of the liquid crystal compound are arranged is The direction in which the first spiral axis extends.
  • SEM scanning electron microscope
  • the twist angle of the liquid crystal compound exceeds 180°, bright portions and dark portions appear repeatedly.
  • the optical element is cut along the direction in which the first helical axis in the optical element extends to expose the cross section of the optical element.
  • the obtained cross section is observed with a scanning electron microscope, and the direction in which the linear bright portions and linear dark portions originating from the twisted orientation of the liquid crystal compound are aligned is defined as the direction of the first helical axis.
  • the twist angle of the liquid crystal compound exceeds 180°, bright portions and dark portions appear repeatedly.
  • An angle between the direction of the first spiral axis and the normal direction of the surface of the optical element is measured. The angle is measured at five cross sections, and the obtained values are arithmetically averaged to determine the angle formed by the first helical axis and the normal direction of the optical element surface (the angle of inclination of the first helical axis). do.
  • the direction (Y direction) orthogonal to the helical axis of the liquid crystal compound 12 corresponds to the direction of the in-plane absorption axis (black arrow).
  • the azimuth with the lowest transmittance for linearly polarized light in the in-plane direction of the optical element 10A corresponds to the Y direction.
  • FIG. 2 shows only the liquid crystal compound 12 along two helical axes due to space limitations, the optical element 10A may include liquid crystal compounds 12 along a plurality of helical axes.
  • FIG. 1 shows only the liquid crystal compound 12 along one helical axis, but the optical element 10A includes the liquid crystal compound 12 along a plurality of helical axes along the thickness direction. It may be
  • the liquid crystal compound 12 is twisted in the optical element 10A.
  • the dichroic substance is not shown in FIG. 1, the dichroic substance is normally aligned along the alignment direction of the liquid crystal compound 12 . That is, the dichroic substance is preferably twisted along the helical axis of the liquid crystal compound 12 . More specifically, as shown in FIG. 3, since the dichroic substance 14 indicated by the dashed line is likely to be arranged along the liquid crystal compound 12, the liquid crystal compound 12 and the dichroic substance 14 are arranged in the optical element 10A. They are twisted with the same helical pitch.
  • the dichroic substance 14 When the dichroic substance 14 is twisted along the helical pitch, the long axis directions of the dichroic substance 14 with high absorption are arranged in various directions. As a result, when the optical element 10A is viewed from various oblique directions, the long axis directions of the dichroic substance 14 are likely to intersect with each other in any direction. Excellent.
  • the liquid crystal compound 12 and the dichroic substance 14 are overlapped, but in reality, the liquid crystal compound 12 and the dichroic substance 14 are separated from each other by the same helix. It is twisted along the axis.
  • the optical element preferably contains the dichroic substance twisted along the helical axis, and preferably the dichroic substance twisted along the helical axis is fixed.
  • the angle formed by the helical axis of the twisted orientation of the dichroic substance and the normal direction of the surface of the optical element is preferably 10 to 90°, and preferably 30 to 30°, as in the case of the liquid crystal compound described above. 90° is more preferred, and 45 to 90° is even more preferred.
  • the azimuth and tilt angle of the helical axis of the dichroic substance (hereinafter also referred to as "second helical axis") can be determined by the following method. It can be calculated by First, a method for measuring the orientation of the second spiral axis (the orientation in which the spiral axis extends when observed from the direction (normal direction) perpendicular to the main surface of the optical element) will be described. Place the optical element to be measured on the stage of a polarizing microscope with a polarizer and no analyzer, rotate the stage while looking through the polarizing microscope, and search for the direction where the transmitted light is the darkest.
  • the orientation of the second helical axis in the optical element is parallel to the absorption axis orientation of the polarizer of the polarizing microscope (that is, the absorption axis of the dichroic dye is parallel to the absorption axis orientation of the polarizer of the polarizing microscope. orthogonal).
  • a method for measuring the inclination angle of the second spiral axis will be described.
  • the optical element is cut using a microtome along the orientation of the second helical axis identified by the method described above, perpendicular to the main surface, and a section with a thickness of 2 ⁇ m is taken.
  • a bright portion and a dark portion are observed according to the pitch of the spiral.
  • a striped pattern in which bright portions and dark portions are alternately arranged is observed.
  • the direction in which such bright portions and dark portions are arranged corresponds to the direction of the second spiral axis, and the angle formed by this direction and the normal direction of the surface of the optical element is obtained. can identify the tilt angle of the second helical axis.
  • the dichroic dye is twisted
  • preferred embodiments of the optical element include the following embodiments. That is, the optical element is an optical element containing a dichroic dye and a liquid crystal compound, a dichroic substance twisted along a helical axis is fixed, and the helical axis is normal to the surface of the optical element. It may be an optical element that forms an angle of 10 to 90° with respect to the linear direction.
  • the liquid crystal compound may be twisted and fixed along the helical axis.
  • the dichroic substance being “fixed” means a state in which the orientation of the dichroic substance is maintained.
  • the layer does not have fluidity in the temperature range of 0 to 50° C., and -30 to 70° C. under more severe conditions, and the orientation is changed by an external field or force. It is preferable to be in a state in which the fixed alignment form can be stably maintained.
  • the above "fixing" is preferably achieved by polymerizing the polymerizable group using a dichroic substance having a polymerizable group.
  • the length of one cycle in which the molecular axes derived from a plurality of twisted liquid crystal compounds change by 360° is not particularly limited, it is preferably 100 to 100000 nm, more preferably 200 to 10000 nm.
  • the thickness of the optical element is not particularly limited, it is preferably 1 to 10 ⁇ m, more preferably 1 to 5 ⁇ m.
  • the optical element includes a liquid crystal compound that is twisted and fixed along the helical axis.
  • the liquid crystal compound therein does not have to exhibit liquid crystallinity.
  • a liquid crystal compound having a polymerizable group may lose liquid crystallinity by being polymerized by a curing reaction (polymerization reaction).
  • Components included in the optical element include immobilized liquid crystal compounds and dichroic substances.
  • the optical element is preferably formed using an optical element-forming composition containing a liquid crystal compound having a polymerizable group and a dichroic substance.
  • the content of the dichroic substance in the optical element is not particularly limited, and is preferably 1 to 50% by mass, more preferably 10 to 25% by mass, based on the total mass of the optical element.
  • the content of the liquid crystal compound in the optical element is not particularly limited, and is preferably 50% by mass or more and less than 99% by mass, more preferably 70% by mass or more and less than 90% by mass, relative to the total mass of the optical element.
  • the optical element may contain other components (for example, a chiral agent, an alignment control agent, etc.) in addition to the above components.
  • a chiral agent for example, a chiral agent, an alignment control agent, etc.
  • Various components that can be contained in the optical element will be described as components contained in the composition for forming an optical element, which will be described later.
  • a method for manufacturing the optical element described above is not particularly limited, and a known method can be used. Among them, it is preferable to use a composition for forming an optical element containing a liquid crystal compound having a dichroic substance and a polymerizable group. First, the components contained in the composition for forming an optical element will be described in detail below.
  • Liquid crystal compounds are classified into, for example, rod-like liquid crystal compounds and discotic liquid crystal compounds according to their chemical structures.
  • a rod-like liquid crystal compound is known as a liquid crystal compound having a rod-like chemical structure.
  • a known rod-like liquid crystal compound can be used.
  • a discotic liquid crystal compound is known as a liquid crystal compound having a discotic chemical structure.
  • a known discotic liquid crystal compound can be used.
  • a liquid crystal compound has a polymerizable group.
  • Polymerizable groups include, for example, groups having ethylenically unsaturated double bonds, cyclic ether groups, and nitrogen-containing heterocyclic groups capable of undergoing a ring-opening reaction.
  • Groups having ethylenically unsaturated double bonds include, for example, (meth)acryloyl groups, vinyl groups, vinylphenyl groups, and allyl groups.
  • Cyclic ether groups include, for example, epoxy groups and oxetanyl groups.
  • Nitrogen-containing heterocyclic groups capable of undergoing a ring-opening reaction include, for example, aziridinyl groups.
  • a (meth)acryloyl group is preferred as the polymerizable group.
  • a compound represented by formula (A) is preferable as the compound having a polymerizable group.
  • Q 1 and Q 2 each independently represent a polymerizable group
  • L 1 , L 2 , L 3 and L 4 each independently represent a single bond or a divalent linking group
  • a 1 and A 2 each independently represent a divalent hydrocarbon group having 2 to 20 carbon atoms
  • M represents a mesogenic group.
  • the polymerizable groups represented by Q 1 and Q 2 include, for example, the polymerizable groups described above. Preferred embodiments of the polymerizable groups represented by Q 1 and Q 2 are the same as the polymerizable groups described above.
  • the divalent linking groups represented by L 1 , L 2 , L 3 and L 4 are -O-, -S-, -CO-, -NR-, -CO-O-, -O-CO-O-, -CO-NR-, -O-CO-, -O-CO-NR-, and a divalent linking group selected from the group consisting of -NR-CO-NR- Preferably.
  • R in the divalent linking group described above represents an alkyl group having 1 to 7 carbon atoms or a hydrogen atom.
  • Q 1 -L 1 - and Q 2 -L 2 - are each independently CH 2 ⁇ CH—CO—O—, CH 2 ⁇ C(CH 3 )—CO— O— or CH 2 ⁇ C(Cl)—CO—O— is preferred, and CH 2 ⁇ CH—CO—O— is more preferred.
  • the divalent hydrocarbon group having 2 to 20 carbon atoms represented by A 1 and A 2 includes an alkylene group having 2 to 12 carbon atoms and an alkylene group having 2 to 12 carbon atoms. or an alkynylene group having 2 to 12 carbon atoms, more preferably an alkylene group having 2 to 12 carbon atoms.
  • the divalent hydrocarbon group is preferably chain.
  • the divalent hydrocarbon group may contain non-adjacent oxygen atoms or non-adjacent sulfur atoms.
  • the divalent hydrocarbon group may have a substituent.
  • Substituents include, for example, halogen atoms (eg, fluorine, chlorine, and bromine) and cyano groups.
  • the mesogenic group represented by M is a group that forms the main skeleton of a liquid crystal compound that contributes to liquid crystal formation.
  • the mesogenic group represented by M for example, "FlussigeKristalle in Tabellen II” (VEB Manual Verlag fur Grundstoff Industry, Leipzig, 1984) described (especially pp. 7-16) and "liquid crystal handbook” ( Liquid Crystal Handbook Editing Committee, Maruzen, 2000) (especially Chapter 3) can be referred to.
  • Specific structures of the mesogenic group represented by M in formula (A) include, for example, structures described in paragraph [0086] of JP-A-2007-279688.
  • the mesogenic group represented by M is a group containing at least one cyclic structure selected from the group consisting of aromatic hydrocarbon groups, heterocyclic groups, and alicyclic hydrocarbon groups. is preferred, and a group containing an aromatic hydrocarbon group is more preferred.
  • the mesogenic group represented by M is preferably a group containing 2 to 5 aromatic hydrocarbon groups, and a group containing 3 to 5 aromatic hydrocarbon groups. is more preferred.
  • the mesogenic group represented by M preferably contains 3 to 5 phenylene groups and is a group in which the phenylene groups are linked to each other by -CO-O-.
  • the cyclic structure contained in the mesogenic group represented by M may have a substituent. good.
  • substituents include alkyl groups having 1 to 10 carbon atoms (eg, methyl group).
  • the content of the liquid crystal compound having a polymerizable group in the optical element-forming composition is not particularly limited, but is preferably 70% by mass or more, more preferably 80% by mass or more, based on the total solid content of the optical element-forming composition. preferable. Although the upper limit is not particularly limited, it is often less than 100% by mass, more often 98% by mass or less, and more often 89% by mass or less.
  • the total solid content of the composition for forming an optical element refers to all components excluding the solvent from the composition for forming an optical element. It should be noted that the components obtained by removing the solvent from the composition for forming an optical element are treated as solid components even if they are in a liquid state.
  • a dichroic substance means a dye that absorbs differently in different directions.
  • the dichroic substance may be polymerized in the optical element.
  • the dichroic substance is not particularly limited, and includes visible light absorbing substances (dichroic dyes), luminescent substances (fluorescent substances, phosphorescent substances), ultraviolet absorbing substances, infrared absorbing substances, nonlinear optical substances, carbon nanotubes, and inorganic Substances (for example, quantum rods) can be used, and conventionally known dichroic substances (dichroic dyes) can be used.
  • two or more kinds of dichroic substances may be used in combination. It is preferable to use a dichroic substance together with at least one dichroic substance having a maximum absorption wavelength in the wavelength range of 500 nm or more and less than 700 nm.
  • the dichroic substance may have a polymerizable group.
  • the dichroic substance When the dichroic substance has a polymerizable group, the dichroic substance in a predetermined orientation can be fixed when forming an optical element using the composition for forming an optical element.
  • Polymerizable groups include, for example, (meth)acryloyl groups, epoxy groups, oxetanyl groups, and styryl groups, with (meth)acryloyl groups being preferred.
  • a dichroic azo dye compound is a dichroic substance having an azo group.
  • the dichroic azo dye compound may or may not exhibit liquid crystallinity. When the dichroic azo dye compound exhibits liquid crystallinity, it may exhibit nematicity or smecticity.
  • the temperature range showing the liquid crystal phase is preferably room temperature (approximately 20 to 28°C) to 300°C, and more preferably 50 to 200°C from the viewpoint of handleability and production suitability.
  • the composition for forming an optical element includes at least one dichroic azo dye compound having a maximum absorption wavelength in the wavelength range of 560 to 700 nm (hereinafter referred to as "first dichroic azo dye compound”), and at least one dichroic azo dye compound having a maximum absorption wavelength in the wavelength range of 455 nm or more and less than 560 nm (hereinafter also referred to as “second dichroic azo dye compound”). Specifically, it contains at least a dichroic azo dye compound represented by the formula (1) described later and a dichroic azo dye compound represented by the formula (2) described later. is more preferable. In the present invention, three or more dichroic azo dye compounds may be used in combination.
  • An azo dye compound and at least one dichroic azo dye compound having a maximum absorption wavelength in the wavelength range of 380 nm or more and less than 455 nm are used in combination. is preferred.
  • a compound represented by the following formula (1) is preferable as the first dichroic azo dye compound.
  • Ar1 and Ar2 each independently represent an optionally substituted phenylene group or an optionally substituted naphthylene group, preferably a phenylene group.
  • R1 is a hydrogen atom, an optionally substituted linear or branched alkyl group having 1 to 20 carbon atoms, an alkoxy group, an alkylthio group, an alkylsulfonyl group, an alkylcarbonyl group.
  • alkyloxycarbonyl group alkyloxycarbonyl group, acyloxy group, alkyl carbonate group, alkylamino group, acylamino group, alkylcarbonylamino group, alkoxycarbonylamino group, alkylsulfonylamino group, alkylsulfamoyl group, alkylcarbamoyl group, alkylsulfinyl group, alkyl It represents a ureido group, an alkylphosphoamide group, an alkylimino group, or an alkylsilyl group.
  • R1 is a group other than a hydrogen atom
  • R1' represents a hydrogen atom or a linear or branched alkyl group having 1 to 6 carbon atoms. In each group, when a plurality of R1' are present, they may be the same or different.
  • R2 and R3 are each independently a hydrogen atom, an optionally substituted linear or branched alkyl group having 1 to 20 carbon atoms, an alkoxy group, an acyl group, an alkyl represents an oxycarbonyl group, an alkylamide group, an alkylsulfonyl group, an aryl group, an arylcarbonyl group, an arylsulfonyl group, an aryloxycarbonyl group, or an arylamide group; —CH 2 — constituting the alkyl group is —O—, —S—, —C(O)—, —C(O)—O—, —C(O)—S—, —Si(CH 3 ) 2 —O—Si(CH 3 ) 2 —, —NR2′—, —NR2′—CO—, —NR2′—C(O)—O—, —NR2′—C(O)—NR2′—, -
  • R2 and R3 are groups other than hydrogen atoms
  • Polymerizable groups include, for example, (meth)acryloyl groups, epoxy groups, oxetanyl groups, and styryl groups, with (meth)acryloyl groups being preferred.
  • R2' represents a hydrogen atom or a linear or branched alkyl group having 1 to 6 carbon atoms. In each group, when there are multiple R2's, they may be the same or different. R2 and R3 may combine with each other to form a ring, or R2 or R3 may combine with Ar2 to form a ring.
  • R1 is preferably an electron-withdrawing group
  • R2 and R3 are preferably groups with low electron-donating properties.
  • Specific examples of such groups for R1 include an alkylsulfonyl group, an alkylcarbonyl group, an alkyloxycarbonyl group, an acyloxy group, an alkylsulfonylamino group, an alkylsulfamoyl group, an alkylsulfinyl group, an alkylureido group, and the like.
  • R2 and R3 include groups having the following structures. The group having the structure below is shown in the above formula (1) in a form containing a nitrogen atom to which R2 and R3 are bonded.
  • a compound represented by formula (2) is preferable as the second dichroic azo dye compound.
  • n 1 or 2.
  • Ar3, Ar4 and Ar5 are each independently a phenylene group optionally having substituent(s), a naphthylene group optionally having substituent(s), or having a substituent represents a heterocyclic group.
  • Heterocyclic groups may be either aromatic or non-aromatic. Atoms other than carbon constituting the aromatic heterocyclic group include a nitrogen atom, a sulfur atom and an oxygen atom. When the aromatic heterocyclic group has a plurality of non-carbon ring-constituting atoms, these may be the same or different.
  • aromatic heterocyclic groups include pyridylene group (pyridine-diyl group), pyridazine-diyl group, imidazole-diyl group, thienylene (thiophene-diyl group), quinolylene group (quinoline-diyl group), isoquinolylene group (isoquinoline -diyl group), oxazole-diyl group, thiazole-diyl group, oxadiazole-diyl group, benzothiazole-diyl group, benzothiadiazole-diyl group, phthalimido-diyl group, thienothiazole-diyl group, thiazolothiazole-diyl group groups, thienothiophene-diyl groups, and thienooxazole-diyl groups.
  • pyridylene group pyridine-diyl group
  • R4 is the same as that of R1 in formula (1).
  • definitions of R5 and R6 are the same as those of R2 and R3 in formula (1).
  • R4 is preferably an electron-withdrawing group
  • R5 and R6 are preferably groups with low electron-donating properties.
  • specific examples in which R4 is an electron-withdrawing group are the same as specific examples in which R1 is an electron-withdrawing group
  • R5 and R6 are groups with low electron-donating properties.
  • R2 and R3 are low electron-donating groups, specific examples are the same as those for R2 and R3.
  • a dichroic azo dye represented by the following formula (3) is preferable as the third dichroic azo dye compound.
  • a and B each independently represent a crosslinkable group.
  • a and b each independently represent 0 or 1. Both a and b are preferably 0 in terms of excellent orientation at a wavelength of 420 nm.
  • Ar 1 represents a (n1+2)-valent aromatic hydrocarbon group or heterocyclic group
  • Ar 2 represents a (n2+2)-valent aromatic hydrocarbon group or heterocyclic group
  • Ar 3 represents ( represents an n3+2)-valent aromatic hydrocarbon group or heterocyclic group
  • R 1 , R 2 and R 3 each independently represent a monovalent substituent.
  • n1 ⁇ 2 the plurality of R1 may be the same or different
  • n2 ⁇ 2 the plurality of R2 may be the same or different
  • n3 ⁇ 2. may be the same or different from each other.
  • k represents an integer of 1-4.
  • Examples of the crosslinkable groups represented by A and B in formula (3) include polymerizable groups described in paragraphs [0040] to [0050] of JP-A-2010-244038.
  • a (meth)acryloyl group, an epoxy group, an oxetanyl group, and a styryl group are preferable from the viewpoint of improving reactivity and synthesis aptitude, and a (meth)acryloyl group from the viewpoint that the solubility can be further improved. is more preferred.
  • L2 represents a monovalent substituent
  • L2 represents a single bond or a divalent linking group
  • the monovalent substituent represented by L 1 and L 2 includes a group introduced to increase the solubility of the dichroic substance, or an electron-donating or electron-donating group introduced to adjust the color tone of the dye.
  • Groups with attractive properties are preferred.
  • an alkyl group preferably an alkyl group having 1 to 20 carbon atoms, more preferably 1 to 12 carbon atoms, still more preferably 1 to 8 carbon atoms, such as a methyl group, an ethyl group, an isopropyl group, a tert-butyl group, n-octyl group, n-decyl group, n-hexadecyl group, cyclopropyl group, cyclopentyl group, and cyclohexyl group, etc.), alkenyl group (preferably an alkenyl group having 2 to 20 carbon atoms, more preferably 2 to 12 carbon atoms, more preferably 2 to 8 carbon atoms, such as vinyl,
  • An aryl group preferably an aryl group having 6 to 30 carbon atoms, more preferably 6 to 20 carbon atoms, still more preferably 6 to 12 carbon atoms, such as a phenyl group, 2,6-diethylphenyl group, 3,5 -ditrifluoromethylphenyl group, naphthyl group, biphenyl group, etc.
  • a substituted or unsubstituted amino group preferably an amino group having 0 to 20 carbon atoms, more preferably 0 to 10 carbon atoms, still more preferably 0 to 6 carbon atoms, such as an unsubstituted amino group, a methylamino group, dimethylamino group, diethylamino group, and anilino group, etc.
  • an alkoxy group preferably having 1 to 20 carbon atoms, more preferably 1 to 15 carbon atoms, examples of which include methoxy, ethoxy, and butoxy groups
  • An oxycarbonyl group preferably having 2
  • an acyloxy group (preferably having 2 to 20 carbon atoms, more preferably 2 to 10 carbon atoms, still more preferably 2 to 6 carbon atoms, and examples thereof include an acetoxy group and a benzoyloxy group), an acylamino group (preferably having 2 to 20 carbon atoms, more preferably 2 to 10 carbon atoms, still more preferably 2 to 6 carbon atoms, such as acetylamino group and benzoylamino group), an alkoxycarbonylamino group (preferably having 2 to 20 carbon atoms, more preferably 2 to 10 carbon atoms, still more preferably 2 to 6 carbon atoms, such as a methoxycarbonylamino group), an aryloxycarbonylamino group (preferably having 7 to 20 carbon atoms, more preferably 7 to 16 carbon atoms, still more preferably 7 to 12 carbon atoms, such as a phenyloxycarbonylamino group), A sulfonylamino group (preferably having 2
  • a sulfamoyl group (preferably having 0 to 20 carbon atoms, more preferably 0 to 10 carbon atoms, still more preferably 0 to 6 carbon atoms, such as sulfamoyl group, methylsulfamoyl group, dimethylsulfamoyl group, and phenylsulfamoyl group, etc.), Carbamoyl group (preferably having 1 to 20 carbon atoms, more preferably 1 to 10 carbon atoms, still more preferably 1 to 6 carbon atoms, such as unsubstituted carbamoyl group, methylcarbamoyl group, diethylcarbamoyl group, and phenyl carbamoyl groups, etc.), an alkylthio group (preferably having 1 to 20 carbon atoms, more preferably 1 to 10 carbon atoms, still more preferably 1 to 6 carbon atoms, such as a methylthio group and an ethylthio group), an
  • Phosphate amide group preferably having 1 to 20 carbon atoms, more preferably 1 to 10 carbon atoms, more preferably 1 to 6 carbon atoms, such as a diethyl phosphate amide group, a phenyl phosphate amide group, etc.
  • a heterocyclic group preferably a heterocyclic group having 1 to 30 carbon atoms, more preferably 1 to 12 carbon atoms, for example, a heterocyclic group having a heteroatom such as a nitrogen atom, an oxygen atom, and a sulfur atom, such as , an imidazolyl group, a pyridyl group, a quinolyl group, a furyl group, a piperidyl group, a morpholino group, a benzoxazolyl group, a benzimidazolyl group, and a benzthiazolyl group.), A silyl group (preferably a silyl group having 3 to 40 carbon atoms, more preferably 3 to 30 carbon atoms, still more preferably 3 to 24 carbon atoms, such as a trimethylsilyl group and a triphenylsilyl group) be done.), halogen atoms (e.g., fluorine atom, chlorine atom, bromine atom, i
  • substituents may be further substituted by these substituents. Moreover, when it has two or more substituents, they may be the same or different. In addition, when possible, they may be bonded to each other to form a ring.
  • groups in which the above substituents are further substituted with the above substituents include R B —(OR A ) na — groups, which are groups in which an alkoxy group is substituted with an alkyl group.
  • R A represents an alkylene group having 1 to 5 carbon atoms
  • R B represents an alkyl group having 1 to 5 carbon atoms
  • na is 1 to 10 (preferably 1 to 5, more preferably 1 to 3) represents an integer.
  • the monovalent substituents represented by L 1 and L 2 include alkyl groups, alkenyl groups, alkoxy groups, and groups in which these groups are further substituted with these groups (for example, R B- (OR A ) na- group) is preferred, and an alkyl group, an alkoxy group, and groups in which these groups are further substituted with these groups (for example, R B- (OR A ) described above). na -groups) are more preferred.
  • Examples of divalent linking groups represented by L 1 and L 2 include -O-, -S-, -CO-, -COO-, -O-CO-O-, -CO-NR N -, -O —CO—NR N —, —NR N —CO—NR N —, —SO 2 —, —SO—, an alkylene group, a cycloalkylene group, an alkenylene group, and a group in which two or more of these groups are combined etc.
  • RN represents a hydrogen atom or an alkyl group. When there are multiple RNs , the multiple RNs may be the same or different.
  • the number of atoms in the main chain of at least one of L 1 and L 2 is preferably 3 or more, more preferably 5 or more. , is more preferably 7 or more, and particularly preferably 10 or more.
  • the upper limit of the number of atoms in the main chain is preferably 20 or less, more preferably 12 or less.
  • the number of atoms in the main chain of at least one of L 1 and L 2 is preferably 1 to 5 from the viewpoint of further improving the degree of orientation of the dichroic substance.
  • the “main chain” in L 1 means the “O” atom that is connected to L 1 and “A” necessary for directly connecting It refers to a moiety
  • the “the number of atoms in the main chain” refers to the number of atoms constituting the moiety.
  • the “main chain” in L 2 means the “O” atom that connects L 2 and “B”.
  • the number of atoms in the main chain refers to the number of atoms constituting the moiety.
  • the “number of atoms in the main chain” does not include the number of branched chain atoms, which will be described later.
  • the number of atoms in the main chain in L1 means the number of atoms in L1 that does not contain branched chains.
  • the " number of atoms in the main chain” in L2 refers to the number of atoms in L2 not including branched chains.
  • the number of atoms in the main chain of L 1 is 5 (the number of atoms in the dotted frame on the left side of the following formula (D1))
  • the main chain of L 2 The number of atoms of is 5 (the number of atoms in the dotted frame on the right side of formula (D1) below).
  • the number of atoms in the main chain of L 1 is 7 (the number of atoms in the dotted frame on the left side of the formula (D10) below), and the number of atoms in the main chain of L 2 is The number is 5 (the number of atoms in the dotted frame on the right side of formula (D10) below).
  • L 1 and L 2 may have a branched chain.
  • the “branched chain” in L 1 means that the “O” atom connected to L 1 in formula (3) and “A” are directly connected. It means the part other than the part necessary for
  • the “branched chain” in L 2 means that the “O” atom that connects L 2 in formula (3) and “B” are directly connected It means the part other than the part necessary for
  • the “branched chain” in L 1 means the longest atomic chain (i.e., main chain).
  • the “branched chain” in L2 means the longest atomic chain extending from the “O” atom connecting L2 in formula ( 3 ) (i.e. main chain).
  • the number of atoms in the branched chain is preferably 3 or less. When the number of atoms in the branched chain is 3 or less, there is an advantage that the degree of orientation of the optical element is further improved.
  • the number of branched chain atoms does not include the number of hydrogen atoms.
  • Ar 1 is (n1+2)-valent (e.g., trivalent when n1 is 1)
  • Ar 2 is (n2+2)-valent (e.g., trivalent when n2 is 1)
  • Ar 3 represents an (n3+2)-valent (for example, trivalent when n3 is 1) aromatic hydrocarbon group or heterocyclic group.
  • each of Ar 1 to Ar 3 can be rephrased as a divalent aromatic hydrocarbon group or divalent heterocyclic group substituted with n1 to n3 substituents (R 1 to R 3 described later).
  • the divalent aromatic hydrocarbon group represented by Ar 1 to Ar 3 may be monocyclic or have a condensed ring structure of two or more rings.
  • the ring number of the divalent aromatic hydrocarbon group is preferably 1 to 4, more preferably 1 to 2, and even more preferably 1 (that is, a phenylene group) from the viewpoint of further improving the solubility.
  • the divalent aromatic hydrocarbon group include phenylene group, azulene-diyl group, naphthylene group, fluorene-diyl group, anthracenediyl group, and tetracenediyl group. , a phenylene group or a naphthylene group, and more preferably a phenylene group.
  • the content of the dichroic substance in the optical element-forming composition is not particularly limited, but is preferably 1 to 50% by mass, more preferably 5 to 30% by mass, based on the total solid content of the optical element-forming composition. , more preferably 10 to 28% by weight, particularly preferably 10 to 25% by weight, and most preferably 20 to 26% by weight.
  • the content of the first dichroic azo dye compound is preferably 40 to 90 parts by mass, more preferably 45 to 75 parts by mass, with respect to 100 parts by mass of the total content of the dichroic substance in the composition for forming an optical element. is more preferred.
  • the content of the second dichroic azo dye compound is preferably 6 to 50 parts by mass, more preferably 8 to 35 parts by mass, with respect to 100 parts by mass of the total dichroic substance content in the composition for forming an optical element. more preferred.
  • the content of the third dichroic azo dye compound is preferably 3 to 40 parts by mass, preferably 5 to 35 parts by mass, with respect to 100 mass parts of the dichroic azo dye compound in the composition for forming an optical element. is more preferred.
  • the content ratio of the first dichroic azo dye compound, the second dichroic azo dye compound, and the optionally used third dichroic azo dye compound is the color of the optical element. It can be set arbitrarily for adjustment.
  • the content ratio of the second dichroic azo dye compound to the first dichroic azo dye compound is in terms of moles , is preferably 0.1 to 10, more preferably 0.2 to 5.
  • the optical element-forming composition may contain a chiral agent.
  • the type of chiral agent is not limited. Examples of the chiral agent include known chiral agents (eg, "Liquid Crystal Device Handbook, Chapter 3, Section 4-3, Chiral Agents for TN and STN, p. 199, Japan Society for the Promotion of Science 142nd Committee, 1989"). and chiral agents described in ).
  • chiral agents contain an asymmetric carbon atom. However, chiral agents are not limited to compounds containing asymmetric carbon atoms. Chiral agents also include, for example, axially chiral compounds that do not contain an asymmetric carbon atom, and planar chiral compounds. Axially chiral compounds and planar chiral compounds include, for example, binaphthyl, helicene, paracyclophane, and derivatives thereof.
  • the chiral agent may have a polymerizable group.
  • a polymer having a structural unit derived from the chiral agent and a structural unit derived from the liquid crystal compound can be obtained by reacting a chiral agent having a polymerizable group with a liquid crystal compound having a polymerizable group.
  • Examples of the polymerizable group in the chiral agent include the polymerizable groups described in the section "Liquid crystal compound” above.
  • a preferred embodiment of the polymerizable group in the chiral agent is the same as the polymerizable group described in the section "Liquid crystal compound” above.
  • the kind of polymerizable group in the chiral agent is preferably the same as the kind of polymerizable group in the liquid crystal compound.
  • the chiral agent is at least one selected from the group consisting of a chiral agent that induces a right-handed helical structure in the liquid crystal compound and a chiral agent that induces a left-handed helical structure in the liquid crystal compound. preferable.
  • the chiral agent preferably has an isosorbide skeleton, an isomannide skeleton, or a binaphthol skeleton, more preferably an isosorbide skeleton or an isomannide skeleton, and even more preferably an isosorbide skeleton.
  • the composition for forming an optical element may contain a chiral agent whose helical inductive force is changed by light irradiation.
  • the helical induced force changes due to light irradiation means that there is a difference between the helical induced force before light irradiation and the helical induced force after light irradiation.
  • the helix-inducing power (HTP) is known as an index representing the ability of a chiral agent to form helices.
  • the helical induced force is generally represented by the reciprocal of the product of the length of one cycle of the helical axis and the concentration of the chiral agent.
  • the helical induction force depends, for example, on the type of chiral agent and the concentration of the chiral agent.
  • a compound having a chiral site and a photoreactive site whose structure is changed by light irradiation (hereinafter also referred to as a photoreactive chiral agent) is preferable.
  • the photoreactive chiral agent is preferably a chiral agent that undergoes photoisomerization because the helical inducing force is easily changed by light irradiation.
  • a chiral agent that undergoes photoisomerization is a chiral agent that has a photoisomerization site.
  • composition for forming an optical element may contain a chiral agent that does not have a photoreactive site whose structure is changed by light irradiation.
  • the content of the chiral agent in the optical element-forming composition is not particularly limited, but is preferably 0.01 to 20% by mass, more preferably 0.05 to 10% by mass, based on the total solid content of the optical element-forming composition. more preferred.
  • the optical element-forming composition may contain a solvent.
  • Solvents include water and organic solvents, with organic solvents being preferred.
  • organic solvents include amide solvents (eg, N,N-dimethylformamide), sulfoxide solvents (eg, dimethylsulfoxide), heterocyclic compounds (eg, pyridine), hydrocarbon solvents (eg, benzene and hexane).
  • alkyl halide solvents e.g. chloroform and dichloromethane
  • ester solvents e.g. methyl acetate and butyl acetate
  • ketone solvents e.g. acetone, methyl ethyl ketone and cyclohexanone
  • ether solvents e.g. tetrahydrofuran, and 1,2-dimethoxyethane.
  • the total solid content in the composition for forming an optical element is preferably 1 to 20% by mass, more preferably 5 to 15% by mass, based on the total mass of the composition for forming an optical element.
  • the optical element-forming composition may contain an alignment control agent.
  • alignment control agents include compounds described in paragraphs [0012] to [0030] of JP-A-2012-211306, and compounds described in paragraphs [0037] to [0044] of JP-A-2012-101999.
  • a polymer containing polymerized units of a fluoroaliphatic group-containing monomer in an amount of more than 50% by mass based on the total polymerized units described in JP-A-2004-331812 may be used as an alignment control agent.
  • Orientation control agents also include vertical alignment agents.
  • vertical alignment agents include boronic acid compounds and/or onium salts described in JP-A-2015-038598 and onium salts described in JP-A-2008-026730.
  • the content of the alignment control agent in the composition for forming an optical element is not particularly limited, it is preferably 0.1 to 2.0% by mass based on the total solid content of the composition for forming an optical element.
  • the composition for forming an optical element may contain a polymerization initiator.
  • Polymerization initiators include photopolymerization initiators and thermal polymerization initiators.
  • the ultraviolet absorption wavelength of the polymerization initiator is preferably different from the ultraviolet absorption wavelength of the photosensitive chiral agent described above. By making the ultraviolet absorption wavelength of the polymerization initiator different from that of the photosensitive chiral agent, it is possible to change the spiral induction force of the photosensitive chiral agent while suppressing the curing of the coating film in the step described later.
  • the content of the polymerization initiator in the composition for forming an optical element is not particularly limited, but is preferably 0.5 to 5.0% by mass, more preferably 1.0 to 4%, based on the total solid content of the composition for forming an optical element. 0% by mass is more preferred.
  • step (A1) a step of forming a composition layer (hereinafter referred to as “step (A1)") by applying a composition for coating (hereinafter also simply referred to as "composition 1"); and a composition layer on the substrate.
  • step (B1) a step of applying a shearing force to the surface of the (hereinafter referred to as “step (B1)”), and applying the shearing force to the composition layer, the helix of the chiral agent whose helical inductive force changes due to the light irradiation
  • step (C1) a step of irradiating ultraviolet rays containing a wavelength that changes the induced force
  • step (D1) a step of curing the composition layer irradiated with ultraviolet rays
  • Step (A1) a composition for forming an optical element containing a dichroic substance, a liquid crystal compound having a polymerizable group, and a chiral agent whose helical inductive force changes upon irradiation with light is applied onto the substrate. to form a composition layer.
  • applying the composition 1 on the substrate is not limited to direct contact of the composition 1 with the substrate, but the composition 1 is brought into contact with the substrate via any layer. encompasses
  • the optional layer may be one of the constituents of the substrate or may be a layer formed on the substrate prior to application of composition 1 .
  • Optional layers include, for example, an orientation layer, an easy adhesion layer, and an antistatic layer. A method for forming the alignment layer will be described later.
  • the base material is preferably a base material containing a polymer.
  • base materials containing polymers include polyester-based base materials (polymers contained in the base material include, for example, polyethylene terephthalate and polyethylene naphthalate), cellulose-based base materials (including Examples of the polymer contained include diacetyl cellulose and triacetyl cellulose (abbreviation: TAC)), polycarbonate base material, poly(meth)acrylic base material (as the polymer contained in the base material, , for example, poly(meth)acrylate (e.g., polymethyl methacrylate).), polystyrene-based substrate (polymers contained in the substrate include, for example, polystyrene and acrylonitrile-styrene copolymers.
  • olefin-based substrates include, for example, polyethylene, polypropylene, polyolefins having a cyclic structure (e.g., norbornene structure), and ethylene-propylene copolymers
  • polyamides base material polymers contained in the base material include, for example, polyvinyl chloride, nylon, and aromatic polyamides
  • polyimide base material polysulfone base material, polyethersulfone base material, polyether ether ketone-based base material, polyphenylene sulfide-based base material, vinyl alcohol-based base material, polyvinylidene chloride-based base material, polyvinyl butyral-based base material, polyoxymethylene-based base material, and epoxy resin-based base material.
  • the substrate may be a substrate comprising two or more polymers (ie, a blend polymer).
  • the substrate is preferably a cellulosic substrate, more preferably a substrate containing triacetylcellulose
  • the total light transmittance of the substrate is preferably 80% or higher, more preferably 90% or higher, and even more preferably 95% or higher.
  • the upper limit of the total light transmittance of the substrate is not restricted.
  • the total light transmittance of the substrate may be determined, for example, within the range of 100% or less.
  • the total light transmittance of the substrate is measured using a known spectrophotometer (for example, haze meter, NDH 2000, Nippon Denshoku Industries Co., Ltd.).
  • the shape of the base material is not limited.
  • the shape of the substrate may be determined, for example, depending on the application.
  • the base material is preferably a flat base material.
  • the thickness of the substrate is preferably 10 to 250 ⁇ m, more preferably 40 to 150 ⁇ m, from the viewpoints of manufacturability, manufacturing cost, and optical properties.
  • composition 1 The various components that can be contained in composition 1 are as described above.
  • Examples of the method of applying composition 1 include an extrusion die coater method, a curtain coating method, a dip coating method, a spin coating method, a print coating method, a spray coating method, a slot coating method, a roll coating method, a slide coating method, and a blade coating method. method, gravure coating method, and wire bar method.
  • Step (B1) In step (B1), a shearing force is applied to the surface of the composition layer on the substrate.
  • the helical axis is tilted in the direction in which the shear force is applied.
  • the inclination angle of the helical axis is adjusted according to the conditions of this process (for example, temperature and shear rate).
  • the shearing force is preferably applied in one direction along the surface of the composition layer.
  • Means for applying shear force include, for example, blades, air knives, burs, and applicators.
  • a blade or an air knife is preferably used to apply a shearing force to the surface of the composition layer, and a blade is more preferably used to apply the shearing force to the surface of the composition layer.
  • the thickness of the composition layer may change before and after application of the shear force.
  • the thickness of the composition layer after the shear force is applied by the blade may be 1/2 or less or 1/3 or less of the thickness of the composition layer before the shear force is applied.
  • the thickness of the composition layer after the shearing force is applied by the blade is preferably 1/4 or more of the thickness of the composition before the shearing force is applied.
  • the blade material is not restricted.
  • Materials for the blade include, for example, metal (eg, stainless steel) and resin (eg, Teflon (registered trademark)).
  • the shape of the blade is not restricted.
  • the shape of the blade may be, for example, a plate shape.
  • the blade is preferably a plate-like member made of metal because it can easily apply a shearing force to the composition layer.
  • the thickness of the tip of the blade that comes into contact with the composition layer is preferably 0.1 mm or more, more preferably 1 mm or more, from the viewpoint that it is easy to apply a shearing force to the composition layer.
  • the upper limit of blade thickness is not limited.
  • the thickness of the blade may be determined, for example, within a range of 10 mm or less.
  • the shearing force is applied to the surface of the composition layer by blowing compressed air onto the surface of the composition layer with an air knife.
  • the shear rate imparted to the composition layer can be adjusted according to the speed at which the compressed air is blown (that is, the flow rate).
  • the direction in which the compressed air is blown by the air knife may be the same direction or the opposite direction to the transport direction of the composition layer.
  • the direction in which the compressed air is blown by the air knife is the same as the direction in which the composition layer is conveyed, in order to prevent fragments of the composition layer scraped off by the compressed air from adhering to the composition layer remaining on the substrate. is preferably
  • the shear rate is preferably 1,000 sec -1 or higher, more preferably 10,000 sec -1 or higher, and even more preferably 30,000 sec -1 or higher.
  • the upper limit of shear rate is not restricted.
  • the shear rate may be determined, for example, within a range of 1.0 ⁇ 10 6 sec ⁇ 1 or less.
  • the shear rate is the shortest distance between the blade and the substrate as “d”, and the transport speed of the composition layer in contact with the blade (i.e., the composition layer and the blade (relative velocity) is "V”, it is obtained by "V/d”.
  • the shear rate is such that the thickness of the composition layer after shearing is "h” and the relative speed between the composition layer surface and the substrate surface is “V ”, it is obtained by “V/2h”.
  • the surface temperature of the composition layer when the shear force is applied may be determined according to the phase transition temperature of the liquid crystal compound contained in the composition layer.
  • the surface temperature of the composition layer when shearing force is applied is preferably 50 to 120.degree. C., more preferably 60 to 100.degree.
  • the surface temperature of the composition layer is measured using a radiation thermometer whose emissivity is calibrated by the temperature value measured by the non-contact thermometer.
  • the surface temperature of the composition layer is measured with no reflective object within 10 cm of the surface opposite to the measurement surface (ie, the back side).
  • the thickness of the composition layer before shearing force is applied is preferably 30 ⁇ m or less, more preferably 1 to 25 ⁇ m, even more preferably 3 to 25 ⁇ m, from the viewpoint of forming an optical element with high alignment accuracy.
  • the thickness of the composition layer after the shearing force is applied is preferably 20 ⁇ m or less, more preferably 10 ⁇ m or less, from the viewpoint of forming an optical element with high alignment accuracy.
  • the lower limit of the thickness of the composition layer after application of the shearing force is not limited, it is preferably 0.5 ⁇ m or more.
  • step (C1) the composition layer to which the shearing force has been applied is irradiated with ultraviolet light having a wavelength that changes the helical inductive force of the chiral agent.
  • the inclination angle of the helical axis is changed by changing the helical pitch. For example, the inclination angle of the helical axis increases as the helical pitch increases. As the helical pitch decreases, the inclination angle of the helical axis decreases.
  • the wavelength of the ultraviolet light is not limited as long as it includes the wavelength that changes the helical inductive force of the chiral agent. Whether or not the wavelength of the ultraviolet light includes a wavelength that changes the helical inductive force of the chiral agent is confirmed based on the change in the tilt angle of the helical axis before and after step (C1). When the tilt angle of the helical axis after step (C1) is increased or decreased compared to the tilt angle of the helical axis before step (C1), the wavelength of the ultraviolet light changes the helical inductive force of the chiral agent. Considered to include wavelength.
  • the wavelength that changes the helical inductive force may be determined, for example, according to the type of chiral agent.
  • the wavelength for changing the helical inductive force is preferably 180-400 nm, more preferably 200-380 nm, and even more preferably 300-370 nm.
  • the wavelength of the ultraviolet rays irradiated in step (C1) is It is preferable not to include the ultraviolet absorption wavelength of the agent.
  • the wavelength of the ultraviolet rays irradiated in step (C1) does not include the ultraviolet absorption wavelength of the polymerization initiator, thereby suppressing the curing of the composition layer and changing the helical inductive force of the chiral agent contained in the composition layer. be able to. As a result of the above, the controllability of the inclination angle of the helical axis is further improved.
  • the composition layer can be irradiated with ultraviolet rays that do not include the ultraviolet absorption wavelength of the polymerization initiator by using a long wavelength cut filter described later or an LED (light emitting diode) ultraviolet irradiator with a narrow irradiation wavelength band.
  • a member that selectively transmits or blocks a specific wavelength (hereinafter referred to as "member having wavelength selectivity”) may be used.
  • member having wavelength selectivity a member that selectively transmits or blocks a specific wavelength
  • the member having wavelength selectivity include a long wavelength cut filter (SH0325, Asahi Spectrosco Co., Ltd.), a short wavelength cut filter, and a bandpass filter.
  • the amount of ultraviolet light exposure (also referred to as the integrated amount of light) is not limited.
  • the amount of change in the helical inducing force of the chiral agent can be adjusted according to the amount of ultraviolet light exposure. As the amount of exposure to ultraviolet light increases, the amount of change in the helical inducing force of the chiral agent tends to increase. As the amount of exposure to ultraviolet light decreases, the amount of change in the helical induction force of the chiral agent tends to decrease.
  • the amount of ultraviolet light exposure may be determined, for example, within the range of 1 to 1,000 mJ/cm 2 .
  • ultraviolet light sources include lamps (e.g., tungsten lamps, halogen lamps, xenon lamps, xenon flash lamps, mercury lamps, mercury-xenon lamps, LED lamps, LED-UV (ultraviolet) lamps, and carbon arc lamps), lasers. (eg, semiconductor lasers, helium neon lasers, argon ion lasers, helium cadmium lasers, and YAG (Yttrium Aluminum Garnet) lasers), light emitting diodes, and cathode ray tubes.
  • lamps e.g., tungsten lamps, halogen lamps, xenon lamps, xenon flash lamps, mercury lamps, mercury-xenon lamps, LED lamps, LED-UV (ultraviolet) lamps, and carbon arc lamps
  • lasers eg, semiconductor lasers, helium neon lasers, argon ion lasers, helium cadmium lasers, and YAG (Yttrium Aluminum Garnet) lasers
  • step (D1) the composition layer irradiated with ultraviolet rays is cured.
  • the molecular alignment of the liquid crystal compound can be fixed.
  • Examples of methods for curing the composition layer include heating and irradiation with active energy rays.
  • the method for curing the composition layer is preferably irradiation with active energy rays from the viewpoint of suitability for production.
  • active energy rays include ⁇ -rays, ⁇ -rays, X-rays, ultraviolet rays, infrared rays, visible rays, and electron beams.
  • ultraviolet rays are preferable from the viewpoint of curing sensitivity and availability of equipment.
  • Examples of the ultraviolet light source include the light source described in the section "Step (C1)" above.
  • the peak wavelength of ultraviolet rays emitted from the ultraviolet light source is preferably 200 to 400 nm.
  • the amount of ultraviolet light exposure (also referred to as an integrated amount of light) is preferably 100 to 1000 mJ/cm 2 .
  • the production method may include steps other than steps (A1) to (D1).
  • step (E1)- A step of forming an alignment layer on the substrate may be included before step (A1).
  • the alignment layer can give an alignment regulating force to the liquid crystal compound.
  • the method of forming the alignment layer is not limited.
  • a known method can be used as a method for forming the alignment layer.
  • Methods for forming the alignment layer include, for example, rubbing treatment of an organic compound (preferably polymer), oblique vapor deposition of an inorganic compound, and formation of a layer having microgrooves.
  • composition 1 contains a solvent
  • step (A1) and step (B1) the content of the solvent in the composition layer coated on the substrate is reduced to the total mass of the composition layer
  • the solvent content in the composition layer is preferably 40% by mass or less, more preferably 30% by mass or less, relative to the total mass of the composition layer.
  • the lower limit of the solvent content in the applied composition layer is not limited.
  • the content of the solvent in the composition layer may be 0% by mass with respect to the total mass of the composition layer.
  • the content of the solvent in the composition is measured by the absolute dry method. Specific procedures of the measurement method are described below. After drying a sample taken from the composition at 60° C. for 24 hours, the change in mass of the sample before and after drying (ie, the difference between the mass of the sample after drying and the mass of the sample before drying) is determined. The solvent content in the sample is determined based on the change in mass of the sample before and after drying. Let the arithmetic mean of the value obtained by performing the said operation 3 times be a content rate of a solvent.
  • step (F1) the method for adjusting the content of the solvent in the composition layer includes, for example, drying.
  • drying means for the composition layer known drying means can be used. Drying means include, for example, ovens, hot air fans, and infrared (IR) heaters.
  • composition 2 a composition for forming an optical element (hereinafter simply referred to as “composition 2”) to form a composition layer (hereinafter also referred to as “step (A2)”), and a step of applying a shear force to the surface of the composition layer on the substrate ( hereinafter also referred to as “step (B2)”) and a step of curing the composition layer to which the shear force is applied (hereinafter also referred to as “step (C2)”).
  • step (A2) a composition layer
  • step (B2) a step of applying a shear force to the surface of the composition layer on the substrate
  • step (C2) a step of curing the composition layer to which the shear force is applied
  • an optical element can be manufactured in which the angle between the twisted helical axis of the liquid crystal compound and the normal direction of the surface of the optical element is 10° or less and more than 90°.
  • composition 2 used in step (A2) are as described above.
  • Examples of the method of applying composition 2 described in step (A2) include the method of applying composition 1 described in step (A1) described above.
  • the procedure for applying shear force in step (B2) includes the procedure for applying shear force in step (B1) described above.
  • the curing treatment of the composition layer performed in step (C2) includes the curing treatment performed in step (D1) described above.
  • step (E1) may be performed before step (A2).
  • the optical element of the present invention may be combined with a polarizer to form a laminate. That is, the laminate of the present invention includes an optical element and a polarizer.
  • polarizers include iodine-based polarizers, dye-based polarizers using dichroic dyes, and polyene-based polarizers.
  • Iodine-based polarizers and dye-based polarizers include coating-type polarizers and stretching-type polarizers, and both can be applied.
  • a coated polarizer a polarizer in which a dichroic organic dye is oriented using the orientation of a liquid crystal compound is preferable.
  • a polarizer made by as a method of obtaining a polarizer by stretching and dyeing a laminated film in which a polyvinyl alcohol layer is formed on a substrate, there are disclosed in Japanese Patent Nos.
  • polyvinyl alcohol-based resins (polymers containing —CH 2 —CHOH— as repeating units, particularly polyvinyl alcohol and ethylene-vinyl alcohol copolymers are selected from the group consisting of polyvinyl alcohol resins, which are readily available and excellent in the degree of polarization. It is preferable that the polarizer includes at least one
  • the thickness of the polarizer is not particularly limited, it is preferably 3 to 60 ⁇ m, more preferably 5 to 20 ⁇ m, even more preferably 5 to 10 ⁇ m.
  • the angle formed by the absorption axis of the polarizer and the azimuth with the lowest transmittance for linearly polarized light in the in-plane direction of the optical element is not particularly limited, but is 0° or more and less than 45°. is preferred, 0° or more and less than 10° is more preferred, and 0° is even more preferred.
  • the method for measuring the specific orientation is as follows. The optical element is mounted on the rotating stage of the polarizing microscope. Next, with the linear polarizer of the polarizing microscope set and the analyzer removed, the rotating stage is rotated to find the direction with the lowest brightness. When the brightness becomes the lowest, it is estimated that the specific orientation of the optical element is orthogonal to the absorption axis of the polarizer of the polarizing microscope, and thus the specific orientation is determined.
  • the laminate may contain the orientation layer and the base material described above.
  • the optical element of the present invention can be used for any image display device. That is, the present invention also relates to an image display device including the above optical element.
  • the image display device is not particularly limited, and examples thereof include a liquid crystal display device, a self-luminous display device (organic EL (electroluminescence) display device, and a micro LED (light emitting diode) display device), and the like.
  • Display panels in image display devices include display panels including liquid crystal cells, display panels of self-luminous display devices, and the like, and optical elements are arranged on these display panels.
  • a liquid crystal display usually has a liquid crystal cell and a backlight, and polarizers are provided on both the viewing side and the backlight side of the liquid crystal cell.
  • the optical element of the present invention can be applied to either the viewing side or the backlight side of the liquid crystal display device, or can be applied to both sides.
  • Application to a liquid crystal display device can be realized by arranging the optical element of the present invention on a polarizer on either or both surfaces of the liquid crystal display device.
  • the liquid crystal cell constituting the liquid crystal display device will be described in detail below.
  • Liquid crystal cells used in liquid crystal display devices are preferably in VA (Vertical Alignment) mode, OCB (Optically Compensated Bend) mode, IPS (In-Plane-Switching) mode, or TN (Twisted Nematic) mode. , but not limited to these.
  • VA Vertical Alignment
  • OCB Optically Compensated Bend
  • IPS In-Plane-Switching
  • TN Transmission Nematic
  • the rod-like liquid crystalline molecules are substantially horizontally aligned when no voltage is applied, and are twisted at an angle of 60 to 120°.
  • a TN mode liquid crystal cell is most widely used as a color TFT (Thin Film Transistor) liquid crystal display device, and is described in many documents.
  • the rod-like liquid crystal molecules are aligned substantially vertically when no voltage is applied.
  • VA mode liquid crystal cells include (1) a narrowly defined VA mode liquid crystal cell in which rod-like liquid crystalline molecules are aligned substantially vertically when no voltage is applied and substantially horizontally aligned when voltage is applied (Japanese Unexamined Patent Application Publication No. 2-2002). 176625), and (2) a liquid crystal cell in which the VA mode is multi-domained (MVA mode) for widening the viewing angle (SID97, Digest of tech. Papers (preliminary collection) 28 (1997) 845).
  • a liquid crystal cell in a mode in which rod-like liquid crystalline molecules are substantially vertically aligned when no voltage is applied and twisted multi-domain alignment is performed when voltage is applied (Proceedings of the Japan Liquid Crystal Forum 58-59 (1998)) and (4) Survival mode liquid crystal cells (presented at LCD International 98).
  • any of PVA (Patterned Vertical Alignment) type, optical alignment type, and PSA (Polymer-Sustained Alignment) type may be used. Details of these modes are described in Japanese Unexamined Patent Application Publication No. 2006-215326 and Japanese National Publication of International Patent Application No. 2008-538819.
  • IPS mode liquid crystal cell rod-like liquid crystal molecules are oriented substantially parallel to the substrate, and the liquid crystal molecules respond planarly by applying an electric field parallel to the substrate surface.
  • a black display is obtained when no electric field is applied, and the absorption axes of the pair of upper and lower polarizers are perpendicular to each other.
  • a method of using an optical compensatory sheet to reduce leakage light during black display in an oblique direction and improve the viewing angle is disclosed in Japanese Patent Application Laid-Open Nos. 10-54982, 11-202323 and 9-292522. JP-A-11-133408, JP-A-11-305217, and JP-A-10-307291.
  • a long triacetyl cellulose (TAC) film (Fuji Film Co., Ltd., refractive index: 1.48, thickness: 80 ⁇ m, width: 300 mm) was prepared as a base material.
  • a bar bar (bar number: 6)
  • the alignment layer-forming composition was applied onto a base material (triacetylcellulose film), and then dried in an oven at 100° C. for 10 minutes.
  • An alignment layer (thickness: 2 ⁇ m) was formed on the substrate by the above procedure.
  • composition X for forming an optical element.
  • a polypropylene filter pore size: 0.2 ⁇ m
  • Compound (A) is a mixture of the three compounds shown below. The content of each compound in the mixture is 84% by mass, 14% by mass, and 2% by mass in order from the top.
  • a substrate having an alignment layer was heated at 70°C, and then, using a bar (bar number: 18), the composition X for forming an optical element was applied onto the alignment layer.
  • the substrate coated with the composition X for forming an optical element was dried in an oven at 70° C. for 1 minute to obtain a composition layer (thickness: 10 ⁇ m, solvent content in the composition layer: 1 mass % or less) was formed.
  • a stainless steel blade heated to 70 ° C. is brought into contact with the composition layer, and then, while in contact with the composition layer, the blade is moved at a speed of 1.5 m / min.
  • a shearing force was applied to the composition layer by moving at .
  • the travel distance of the blade was 30 mm.
  • the shear rate was 2,500 sec -1 .
  • the composition layer to which the shear force is applied is irradiated with ultraviolet rays (exposure amount: 500 mJ/cm 2 ) using a metal halide lamp in a nitrogen atmosphere (oxygen concentration: ⁇ 100 ppm) to irradiate the composition layer. After curing, an optical laminate 1 including the substrate and the optical element 1 was obtained.
  • a liquid crystal compound twisted along the helical axis was fixed.
  • the angle between the spiral axis and the normal direction of the surface of the optical element 1 was 42°.
  • the length of one cycle in which the molecular axis derived from the liquid crystal compound changes by 360° was 1.7 ⁇ m.
  • the dichroic substance contained in the optical element 1 was twisted along the helical axis. That is, the dichroic substance is oriented along the liquid crystal compound.
  • the angle between the axis and the normal to the surface of the optical element 1 was 42°.
  • Example 2 Following the same procedure as in Example 1, a substrate having an alignment layer was obtained.
  • composition Y After mixing each component shown in the following composition Y for forming an optical element, the mixture was filtered using a polypropylene filter (pore size: 0.2 ⁇ m) to prepare a composition Y for forming an optical element.
  • a polypropylene filter pore size: 0.2 ⁇ m
  • Compound E has an isosorbide skeleton.
  • Compound E is a chiral agent that induces a right-handed helical structure. The helical induced force of compound E is changed by light irradiation.
  • a substrate having an alignment layer was heated at 70°C, and then, using a bar (bar number: 18), the composition Y for forming an optical element was applied onto the alignment layer.
  • the substrate coated with the composition Y for forming an optical element was dried in an oven at 70° C. for 1 minute to form a composition layer (thickness: 10 ⁇ m, solvent content in the composition layer: 1 mass % or less) was formed.
  • a stainless steel blade heated to 70 ° C. is brought into contact with the composition layer, and then, while in contact with the composition layer, the blade is moved at a speed of 1.5 m / min.
  • a shearing force was applied to the composition layer by moving at .
  • the travel distance of the blade was 30 mm.
  • the shear rate was 2,500 sec -1 .
  • the composition layer to which the shear force is applied is irradiated with ultraviolet rays (exposure amount: 5 mJ/cm 2 ) using an ultra-high pressure mercury lamp (HOYA Corporation, UL750).
  • the chiral agent was modified.
  • the composition layer was irradiated with ultraviolet rays through a long wavelength cut filter (SH0325, manufactured by Asahi Spectrosco Co., Ltd.).
  • the ultraviolet rays with which the composition layer is irradiated include a wavelength (for example, 315 nm) that changes the helical induction power of the chiral agent whose helical induction power is changed by light irradiation.
  • the obtained composition layer is irradiated with ultraviolet rays (exposure amount: 500 mJ/cm 2 ) using a metal halide lamp to cure the composition layer.
  • An optical laminate 2 was obtained.
  • a liquid crystal compound twisted along the helical axis was fixed.
  • the angle between the spiral axis and the normal direction of the surface of the optical element 2 was 88°.
  • the length of one cycle in which the molecular axis derived from the liquid crystal compound changes by 360° was 1.9 ⁇ m.
  • the dichroic substance contained in the optical element 2 was twisted along the helical axis. In other words, the dichroic substance is oriented along the liquid crystal compound.
  • the angle between the axis and the normal to the surface of the optical element 2 was 88°.
  • Example 3 An optical layered body 3 including a substrate and an optical element 3 was obtained in the same manner as in Example 2, except that the composition Z for forming an optical element was used.
  • a liquid crystal compound twisted along the helical axis was fixed.
  • the angle between the spiral axis and the normal direction of the surface of the optical element 3 was 87°.
  • the length of one cycle in which the molecular axis derived from the liquid crystal compound changes by 360° was 1.9 ⁇ m.
  • the dichroic substance contained in the optical element 3 was twisted along the helical axis. That is, the dichroic substance is oriented along the liquid crystal compound.
  • the angle between the axis and the normal to the surface of the optical element 3 was 87°.
  • Example 4 An IPS mode liquid crystal display device, iPad Air (registered trademark) (manufactured by Apple Inc.), was disassembled and the liquid crystal cell was taken out.
  • the prepared optical layered body 1 was laminated on the viewing side polarizer of the liquid crystal cell so that the base material was on the liquid crystal cell side.
  • the lamination was performed so that the direction of the lowest transmittance for linearly polarized light in the in-plane direction of the optical element 1 in the optical layered body 1 and the absorption axis of the viewer-side polarizer were parallel to each other.
  • an image display device having the optical element 1 was produced.
  • Examples 5-6> An image display device was produced in the same manner as in Example 4, except that the optical layered body 2 or 3 was used instead of the optical layered body 1.
  • IPS mode liquid crystal display device iPad Air (registered trademark) (manufactured by Apple Inc.), was disassembled and the liquid crystal cell was taken out.
  • the light-absorbing anisotropic film P1 to be produced later was pasted on the polarizer on the viewing side of the liquid crystal cell so that the support was on the side of the liquid crystal cell.
  • an image display device of Comparative Example 1 was produced.
  • ⁇ Preparation of light absorption anisotropic film P1> (Preparation of transparent support 1 with alignment film)
  • the surface of a cellulose acylate film (TAC substrate having a thickness of 40 ⁇ m; TG40, Fuji Film Co., Ltd.) was saponified with an alkaline solution, and the following coating solution 1 for forming an alignment film was applied thereon with a wire bar.
  • the cellulose acylate film on which the coating film was formed was dried with hot air at 60° C. for 60 seconds and further with hot air at 100° C. for 120 seconds to form an alignment film PA1, thereby obtaining a transparent support 1 with an alignment film.
  • the film thickness of the alignment film PA1 was 0.5 ⁇ m.
  • the following composition 1 for forming a light absorption anisotropic layer was continuously applied with a wire bar to form a coating film P1.
  • the coating film P1 was heated at 140° C. for 30 seconds and then cooled to room temperature (23° C.). Then, the coating film P1 was heated at 80° C. for 60 seconds and cooled to room temperature again. After that, the coating film P1 is irradiated for 2 seconds under irradiation conditions of an illuminance of 200 mW/cm 2 using an LED lamp (center wavelength 365 nm), thereby forming a light absorption anisotropic layer P1 on the alignment film PA1, and absorbing light.
  • An anisotropic film P1 was obtained.
  • the film thickness of the light absorption anisotropic layer P1 was 3 ⁇ m.
  • the absorption axis was oriented in the normal direction of the light absorption anisotropic layer P1 from the support side to the air side. That is, the dichroic substance was vertically aligned.
  • the light absorption anisotropic layer P1 contained no liquid crystal compound twisted along the helical axis.
  • composition 1 for forming light absorption anisotropic layer ⁇ ⁇ The dichroic substance D-1 7.976 parts by mass ⁇ The dichroic substance D-2 2.991 parts by mass ⁇ The dichroic substance D-3 12.562 parts by mass ⁇ The following polymer liquid crystal compound P- 1 63.809 parts by mass, the following low molecular weight liquid crystal compound M-1 8.973 parts by mass, polymerization initiator IRGACUREOXE-02 (manufactured by BASF) 0.798 parts by mass, the following compound E-1 1.196 parts by mass, below Compound E-2 1.196 parts by mass Surfactant F-1 below 0.199 parts by mass Surfactant F-2 below 0.299 parts by mass Cyclopentanone 937.2 parts by mass Tetrahydrofuran 937.2 parts by mass part benzyl alcohol 19.9 parts by mass ⁇
  • the image display device 20 of each example and comparative example manufactured according to the above procedure is arranged such that the display surface 20A is perpendicular to the ground and the absorption axis of the polarizer on the viewing side of the image display device 20 It was fixed in a state in which the direction of was vertical to the ground. Further, as shown in FIG. 5, a glass plate 22 having a thickness of 2 mm was placed at an angle perpendicular to the screen of the display and the ground. Furthermore, the room was made into a dark room, a sample image was displayed on the display surface 20A, and reflection of the image on the glass plate 22 was visually evaluated sensory. The results are summarized in Table 1. AA: No reflection on the glass plate is visible A: Almost no reflection on the glass plate is visible B: Some reflection on the glass plate is visible C: Reflection on the glass plate is visible D: Reflection on the glass plate is strongly visible
  • Angle (°) represents the angle (°) between the helical axis of the liquid crystal compound twisted along the helical axis in the optical element and the normal direction to the surface of the optical element.
  • the "Evaluation” column of Example 1 represents the results of using the image display device having the optical element 1 produced in Example 4
  • the “Evaluation” column of Example 2 represents the results of the examples.
  • the results of using the image display device having the optical element 2 produced in Example 5 are shown
  • the "Evaluation” column of Example 3 shows the results of using the image display device having the optical element 1 produced in Example 6.
  • the viewing angle control system of the present invention exhibited the desired effect.
  • reflection from the display surface onto the glass plate arranged in an oblique direction was suppressed.
  • the display surface becomes more difficult to see at a specific azimuth angle where the reflection is suppressed, and the viewing angle controllability is higher.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Polarising Elements (AREA)

Abstract

La présente invention concerne : un élément optique qui, lorsqu'il est appliqué à un dispositif d'affichage nécessitant une commande d'angle de visualisation, a une aptitude à la commande d'angle de visualisation plus élevée pour un angle d'azimut de telle sorte que la visualisation à partir d'un angle d'azimut spécifique est impossible ; un stratifié ; et un dispositif d'affichage d'image. Cet élément optique est obtenu par l'immobilisation d'un composé de cristaux liquides aligné en torsion le long d'un axe hélicoïdal, l'angle formé entre l'axe hélicoïdal et la direction normale de la surface de l'élément optique est de 10 à 90°, et l'élément optique contient un matériau dichroïque.
PCT/JP2022/012180 2021-03-30 2022-03-17 Élément optique, stratifié et dispositif d'affichage d'image WO2022209937A1 (fr)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006317656A (ja) * 2005-05-12 2006-11-24 Dainippon Printing Co Ltd 異方性光学素子
JP2009145776A (ja) * 2007-12-17 2009-07-02 Nitto Denko Corp 視角制御システムならびに画像表示装置
WO2018079854A1 (fr) * 2016-10-31 2018-05-03 富士フイルム株式会社 Film optique et dispositif d'affichage à cristaux liquides
WO2019187951A1 (fr) * 2018-03-28 2019-10-03 富士フイルム株式会社 Film optique et procédé de fabrication de film optique

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006317656A (ja) * 2005-05-12 2006-11-24 Dainippon Printing Co Ltd 異方性光学素子
JP2009145776A (ja) * 2007-12-17 2009-07-02 Nitto Denko Corp 視角制御システムならびに画像表示装置
WO2018079854A1 (fr) * 2016-10-31 2018-05-03 富士フイルム株式会社 Film optique et dispositif d'affichage à cristaux liquides
WO2019187951A1 (fr) * 2018-03-28 2019-10-03 富士フイルム株式会社 Film optique et procédé de fabrication de film optique

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