Optical film, optical laminate, and image display device

Abstract

The present invention addresses the problem of providing: an optical film which enables the achievement of an image display device that is capable of achieving a good balance between anti-reflection effect for outside light and improvement of the utilization efficiency of light emitted from a light emitting element if applied to a self-luminous image display device that uses an inorganic EL element, an organic EL element and the like; an optical multilayer body; and an image display device. An optical film according to the present invention comprises a light absorption anisotropic film which is composed of a cured product of a liquid crystal composition that contains a polymerizable liquid crystal compound and a dichroic dye compound; the light absorption anisotropic film has, within a same film surface, a region A wherein the tilt of the absorption axis to the film surface is θA and a region B wherein the tilt of the absorption axis to the film surface is θB; and θA and θB satisfy the relational expressions (1) and (2).　Relational expression (1): |θA - θB| ≥ 10° Relational expression (2): 0° ≤ θB ≤ 5°

Description

[Technical Field]

[0001] The present invention relates to an optical film, an optical laminate, and an image display device. [Background technology]

[0002] BACKGROUND ART In recent years, development has been progressing on display devices that use self-luminous light-emitting elements such as organic electroluminescence (organic EL (Electro Luminescence) and inorganic EL (inorganic LED (Light Emitting Diode))) as alternatives to liquid crystal display devices.

[0003] Image display devices tend to reflect external light, particularly in bright environments, which deteriorates contrast. Therefore, self-luminous display devices using light-emitting elements, such as organic EL display devices and inorganic EL display devices, are provided with a circular polarizing plate, which is made up of a polarizer and a λ / 4 plate, as an anti-reflection film on the surface.

[0004] For example, Patent Document 1 describes an organic EL display device that includes an organic EL element section consisting of a reflective electrode, an organic EL light-emitting layer, and a transparent electrode, and a circular polarizer consisting of a retardation plate and a polarizer, and that has an anti-reflection layer that has a high reflectance in the complementary wavelength range of the color of light reflected by the surface of the circular polarizer and is provided at the air interface of a member that is provided on the viewer side of the circular polarizer. Patent Document 2 also describes a circular polarizing plate for an organic EL display device, which comprises, in this order, a polarizer, a retardation layer that functions as a λ / 4 plate, a barrier layer, and an adhesive layer that has a barrier function, and the barrier layer is made of thin glass with a thickness of 5 to 100 μm, and an organic EL display device that comprises this circular polarizing plate. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2009-259721 [Patent Document 2] Japanese Patent Application Publication No. 2017-022016 Summary of the Invention [Problem to be solved by the invention]

[0006] Such self-luminous display devices, such as inorganic EL display devices and organic EL display devices, have an anti-reflection film (circular polarizing plate) consisting of a polarizer and a λ / 4 plate, which prevents reflection of external light and enables high-contrast image display. However, the downside is that anti-reflection films made up of polarizers and quarter-wave plates also absorb light emitted by light-emitting elements, which means that conventional self-luminous display devices have low light utilization efficiency and are unable to fully utilize the performance of light-emitting elements such as LEDs.

[0007] The object of the present invention is to solve the problems of the conventional art and to provide an optical film which, when applied to a self-luminous image display device using an inorganic EL element, an organic EL element, or the like, can provide an image display device which can achieve both an anti-reflection effect for external light and an improvement in the utilization efficiency of light emitted by the light-emitting element. Another object of the present invention is to provide an optical laminate and an image display device. [Means for solving the problem]

[0008] As a result of extensive research into solving the above problems, the present inventors have found that the above problems can be achieved by the following configuration.

[0009] [1] An optical film having an optically absorptive anisotropic film made of a cured liquid crystal composition containing a polymerizable liquid crystal compound and a dichroic dye compound, wherein the optically absorptive anisotropic film has, within the same film plane, a region A in which the inclination of the absorption axis with respect to the film plane is θA and a region B in which the inclination of the absorption axis with respect to the film plane is θB, and θA and θB satisfy the relationships of the following formulas (1) and (2). |θA - θB| ≧ 10° Equation (1) 0°≦ θB ≦ 5° Equation (2) [2] The optical film according to [1], wherein the inclination θA of the absorption axis is 45 to 90°. [3] The optical film according to [1] or [2], wherein the inclination θA of the absorption axis is 80 to 90°. [4] The optical film according to any one of [1] to [3], wherein the transmittance in the absorption axis direction of the region A is 65% or more. [5] The optical film according to any one of [1] to [4], wherein the degree of orientation in the in-plane direction of the region B is 0.950 or more. [6] The optical film according to any one of [1] to [5], wherein the content of the dichroic dye compound relative to the total mass of the optically absorptive anisotropic film is 15 mass % or more.

[0010] [7] An optical laminate comprising the optical film according to any one of [1] to [6] and a λ / 4 plate laminated together. [8] An image display device comprising the optical film according to any one of [1] to [6] or the optical laminate according to [7]. [9] The image display device according to [8], wherein the position of the region A of the optically absorptive anisotropic film corresponds to the position of the light-emitting element of the image display device.

[10] The image display device according to [8] or [9], wherein the image display device is an electroluminescence display device.

[11] The image display device according to any one of [8] to

[10] , wherein the sum of the thickness of the optical film and the thickness of the λ / 4 plate is 20 μm or less. [Effects of the Invention]

[0011] According to the present invention, an optical film can be provided that, when applied to a self-luminous image display device using an inorganic EL element, an organic EL element, or the like, can provide an image display device that can achieve both an anti-reflection effect for external light and improved utilization efficiency of light emitted by the light-emitting element. Furthermore, according to the present invention, an optical laminate and an image display device can be provided. [Brief explanation of the drawings]

[0012] [Figure 1]1 is a diagram conceptually illustrating an example of an image display device of the present invention. [Figure 2] FIG. 2 is a schematic diagram illustrating the definition of θ, which is the angle of the absorption axis of the optically absorptive anisotropic film used in the present invention. [Figure 3] FIG. 1 is a cross-sectional view conceptually illustrating an example of the optical film of the present invention. [Figure 4] FIG. 1 is a diagram conceptually showing an example of an EL substrate used in an image display device of the present invention. [Figure 5] FIG. 1 is a diagram conceptually showing an example of an EL substrate used in an image display device of the present invention. [Figure 6] FIG. 1 is a diagram conceptually showing an example of an EL substrate used in an image display device of the present invention. [Figure 7] FIG. 1 is a diagram conceptually showing an example of an EL substrate used in an image display device of the present invention. [Figure 8] FIG. 1 is a diagram conceptually showing an example of an EL substrate used in an image display device of the present invention. [Figure 9] FIG. 1 is a conceptual diagram illustrating an example of a method for forming an optically absorptive anisotropic film used in the present invention. [Figure 10] 1 is a diagram conceptually illustrating an example of an embodiment of an optically absorptive anisotropic film used in the present invention. [Figure 11] 11 is an example of a photograph showing the embodiment of FIG. 10. [Figure 12] 1 is a diagram conceptually illustrating an example of an embodiment of an optically absorptive anisotropic film used in the present invention. [Figure 13] 13 is an example of a photograph showing the embodiment of FIG. 12. DETAILED DESCRIPTION OF THE INVENTION

[0013] The optical film, optical laminate, and image display device of the present invention will be described in detail below based on preferred embodiments shown in the accompanying drawings.

[0014] The following description of the components may be based on typical embodiments of the present invention, but the present invention is not limited to such embodiments. In this specification, a numerical range expressed using "to" means a range that includes the numerical values ​​before and after "to" as the lower and upper limits. Furthermore, in this specification, parallel, orthogonal, horizontal, and vertical do not mean parallel, orthogonal, horizontal, and vertical in the strict sense, but rather mean a range of parallel ±10°, a range of orthogonal ±10°, a range of horizontal ±10°, and a range of vertical ±10°, respectively. In this specification, the liquid crystal composition and liquid crystal compound conceptually include those that no longer exhibit liquid crystallinity due to curing or the like. In addition, in this specification, each component may be a substance corresponding to the component, and may be used alone or in combination of two or more. Here, when two or more substances are used in combination for each component, the content of that component refers to the total content of the substances used in combination, unless otherwise specified. Furthermore, in this specification, "(meth)acrylate" is a notation representing "acrylate" or "methacrylate", "(meth)acrylic" is a notation representing "acrylic" or "methacrylic", and "(meth)acryloyl" is a notation representing "acryloyl" or "methacryloyl".

[0015] In the present invention, visible light refers to electromagnetic waves with wavelengths visible to the human eye, in the wavelength range of 380 to 780 nm, while invisible light refers to light with wavelengths shorter than 380 nm and longer than 780 nm. Furthermore, although not limited to this, among visible light, light in the wavelength range of 420 to 490 nm is blue light, light in the wavelength range of 495 to 570 nm is green light, and light in the wavelength range of 620 to 750 nm is red light.

[0016] <Optical film> The optical film of the present invention is an optical film having an optically absorptive anisotropic layer made of a cured product of a liquid crystal composition containing a polymerizable liquid crystal compound and a dichroic dye compound, wherein the optically absorptive anisotropic layer has, within the same layer plane, a region A in which the inclination of the absorption axis with respect to the layer plane is θA and a region B in which the inclination of the absorption axis with respect to the layer plane is θB, and the relationship between θA and θB satisfies the following formulas (1) and (2): |θA - θB| ≧ 10° Equation (1) 0°≦ θB ≦ 5° Equation (2) Here, the absorption axis refers to the direction in which transmittance is highest at a wavelength of 550 nm when the tilt angle and tilt direction relative to the film normal are changed, and means, for example, the average value (average direction) of the long axis direction of the oriented dichroic dye compound molecules. Transmittance can be measured by changing the tilt angle and tilt direction using, for example, an AxoScan OPMF-1 (manufactured by OptoScience).

[0017] 2, the angle θ is defined as the angle between a direction 30 parallel to the surface of the optical film of the present invention and an absorption axis 31 in a certain region of the optically absorptive anisotropic film used in the present invention. θA means the angle between the surface of the optical film of the present invention in region A and the absorption axis, and θB means the angle between the surface of the optical film of the present invention in region B and the absorption axis.

[0018] FIG. 3 is a cross-sectional view conceptually showing an example of the optical film of the present invention. 3 includes a transparent support 16 and an optically absorptive anisotropic film 18. The optically absorptive anisotropic film 18 is made of a cured liquid crystal composition containing a polymerizable liquid crystal compound and a dichroic dye compound. The optically absorptive anisotropic film 18 includes, within the same film plane, a region 18A whose absorption axis is inclined at an angle θA relative to the film plane and a region 18B whose absorption axis is inclined at an angle θB relative to the film plane, where θA and θB satisfy the relationships of the following formulas (1) and (2). |θA - θB| ≧ 10° Equation (1) 0°≦ θB ≦ 5° Equation (2) By having two regions with different absorption axes within the same film surface, it becomes possible to adjust the anti-reflection performance of external light and the transmittance performance of the light-emitting element for each region, and it becomes possible to provide a display device that can achieve both the anti-reflection effect of external light and improved utilization efficiency of light emitted by the light-emitting element in a self-luminous display device that uses inorganic EL elements, organic EL elements, etc. Specifically, in region B, where the absorption axis is closer to parallel to the film surface, the polarization performance for external light in the perpendicular incident direction is higher than in region A, and a high anti-reflection effect is achieved.In region A, the absorption axis is closer to perpendicular to the film surface than in region B, and therefore the visible light transmittance in the perpendicular incident direction is high, which is presumed to have the effect of improving the utilization of the luminous efficiency of the self-luminous element.

[0019] In the present invention, from the viewpoint of achieving excellent effects of the present invention, |θA - θB| is preferably 10° or more, more preferably 45° or more, and even more preferably 80° or more. There is no particular upper limit, but it can be 90°. By setting |θA - θB| to a value within the above range, it is possible to achieve both the effect of preventing reflection of external light in the optically absorptive anisotropic film and the improvement in the utilization efficiency of light emitted by the light emitting element.

[0020] In the present invention, from the viewpoint of achieving excellent effects of the present invention, θA is preferably 45 to 90°, more preferably 80 to 90°. By setting θA to a value within the above range, the absorption of light emitted from the light emitting element in the optically absorptive anisotropic film is reduced, leading to improved light utilization efficiency.

[0021] In the present invention, from the viewpoint of achieving excellent effects of the present invention, the transmittance in the absorption axis direction of region A is preferably 65% ​​or more, more preferably 75% or more. By setting the transmittance to a value within the above range, the absorption of light emitted from the light-emitting element in the optically absorptive anisotropic film is reduced, leading to improved light utilization efficiency. There is no particular upper limit for the transmittance, but it is often less than 100%.

[0022] In the present invention, the degree of orientation in the in-plane direction of region B is not particularly limited, and is often 0.930 or more. From the viewpoint of excellent effects of the present invention, the degree of orientation in the in-plane direction of region B is preferably 0.950 or more, and more preferably 0.955 or more. By setting the degree of orientation to a value within the above range, the antireflection performance when using an optically absorptive anisotropic film is improved. The upper limit of the degree of orientation is not particularly limited, but can be 1.000. The degree of orientation in the in-plane direction can be measured by the following method. A sample is set in an optical microscope (Nikon Corporation, product name "ECLIPSE E600 POL") with a linear polarizer inserted on the light source side, and the absorbance of the optically absorptive anisotropic film in the wavelength range of 380 to 780 nm is measured at 1 nm intervals using a multichannel spectrometer (Ocean Optics, product name "QE65000"), and the degree of orientation in the wavelength range of 400 to 700 nm is calculated using the following formula. Orientation degree: S=((Az0 / Ay0)-1) / ((Az0 / Ay0)+2) In the above formula, "Az0" represents the absorbance of the optically absorptive anisotropic film for polarized light in the absorption axis direction in region B, and "Ay0" represents the absorbance of the optically anisotropic layer for polarized light in the transmission axis direction in region B. The degree of orientation at a wavelength of 560 nm in the above measurement is taken as the degree of orientation in the in-plane direction of region B.

[0023] [Light-absorption anisotropic film] As described above, the optically absorptive anisotropic film used in the present invention is made of a cured product of a liquid crystal composition containing a polymerizable liquid crystal compound and a dichroic dye compound.

[0024] [Polymerizable liquid crystal compound] As the polymerizable liquid crystal compound contained in the liquid crystal composition, either a high molecular weight polymerizable liquid crystal compound or a low molecular weight polymerizable liquid crystal compound can be used, and it is preferable to use a high molecular weight polymerizable liquid crystal compound because it can increase the degree of orientation. Here, the term "polymerizable liquid crystal compound" refers to a polymerizable liquid crystal compound having a repeating unit in its chemical structure. Furthermore, the term "low molecular weight polymerizable liquid crystal compound" refers to a polymerizable liquid crystal compound that does not have a repeating unit in its chemical structure. In addition, as the polymerizable liquid crystal compound, a high molecular weight polymerizable liquid crystal compound and a low molecular weight polymerizable liquid crystal compound may be used in combination. For the low molecular weight polymerizable liquid crystal compound, for example, the description in paragraphs

[0042] to

[0053] of International Publication No. 2019 / 235355 can be referred to.

[0025] The polymerizable liquid crystal compound is preferably a high molecular weight polymerizable liquid crystal compound containing a repeating unit represented by the following formula (1) (hereinafter also abbreviated as "repeating unit (1)"), because this results in a higher degree of orientation of the resulting optically absorptive anisotropic film. In the following description, "the degree of orientation of the obtained optically absorptive anisotropic film is higher" is also referred to as "the effect of the present invention is better."

[0026] [ka]

[0027] In the above formula (1), P1 represents the main chain of the repeating unit, L1 represents a single bond or a divalent linking group, SP1 represents a spacer group, M1 represents a mesogenic group, and T1 represents a terminal group.

[0028] Specific examples of the main chain of the repeating unit represented by P1 include groups represented by the following formulae (P1-A) to (P1-D). Among these, the group represented by the following formula (P1-A) is preferred from the viewpoints of the variety of monomers that serve as raw materials and ease of handling.

[0029] [ka]

[0030] In the above formulas (P1-A) to (P1-D), "*" represents the bonding position with L1 in the above formula (1). In the above formulas (P1-A) to (P1-D), R 1 , R 2 , R3 and R 4 are each independently a hydrogen atom, a halogen atom, a cyano group, an alkyl group having 1 to 10 carbon atoms, or an alkoxy group having 1 to 10 carbon atoms. The alkyl group may be a linear or branched alkyl group, or an alkyl group having a cyclic structure (a cycloalkyl group). The alkyl group preferably has 1 to 5 carbon atoms. The group represented by the above formula (P1-A) is preferably one unit of a partial structure of a poly(meth)acrylic acid ester obtained by polymerization of a (meth)acrylic acid ester. The group represented by the above formula (P1-B) is preferably an ethylene glycol unit formed by ring-opening polymerization of the epoxy group of a compound having an epoxy group. The group represented by the above formula (P1-C) is preferably a propylene glycol unit formed by ring-opening polymerization of the oxetane group of a compound having an oxetane group. The group represented by the formula (P1-D) is preferably a siloxane unit of a polysiloxane obtained by condensation polymerization of a compound having at least one of an alkoxysilyl group and a silanol group. Here, the compound having at least one of an alkoxysilyl group and a silanol group is preferably a compound represented by the formula SiR 14 (OR 15 )2-, wherein R 14 is R in (P1-D) 4 is synonymous with R 15 each independently represents a hydrogen atom or an alkyl group having 1 to 10 carbon atoms.

[0031] In the above formula (1), L1 is a single bond or a divalent linking group. Examples of the divalent linking group represented by L1 include -C(O)O-, -OC(O)-, -O-, -S-, and -C(O)NR 3 -, -NR 3 C(O)-, -SO2-, and -NR 3 R 4 In the formula, R 3 and R 4each independently represents a hydrogen atom or an alkyl group having 1 to 6 carbon atoms which may have a substituent. When P1 is a group represented by formula (P1-A), L1 is preferably a group represented by -C(O)O- because the effects of the present invention are better. When P1 is a group represented by any one of formulae (P1-B) to (P1-D), L1 is preferably a single bond because the effects of the present invention are more excellent.

[0032] In the above formula (1), the spacer group represented by SP1 preferably contains at least one structure selected from the group consisting of an oxyethylene structure, an oxypropylene structure, a polysiloxane structure, and a fluorinated alkylene structure, for reasons such as the ease of exhibiting liquid crystallinity and the availability of raw materials. Here, the oxyethylene structure represented by SP1 is *-(CH2-CH2O) n1 A group represented by -* is preferred. In the formula, n1 represents an integer of 1 to 20, and * represents the bonding position with L1 or M1 in the above formula (1). n1 is preferably an integer of 2 to 10, more preferably an integer of 2 to 4, and even more preferably 3, because this provides better effects of the present invention. In addition, the oxypropylene structure represented by SP1 is preferably *-(CH(CH3)-CH2O) because the effect of the present invention is more excellent. n2 A group represented by -* is preferred, where n2 represents an integer of 1 to 3, and * represents the bonding position to L1 or M1. In addition, the polysiloxane structure represented by SP1 is preferably *-(Si(CH3)2-O) because the effect of the present invention is more excellent. n3 A group represented by -* is preferred, where n3 represents an integer of 6 to 10, and * represents the bonding position to L1 or M1. In addition, the fluorinated alkylene structure represented by SP1 is preferably *-(CF2-CF2) because the effect of the present invention is more excellent. n4 A group represented by -* is preferred, where n4 represents an integer of 6 to 10, and * represents the bonding position to L1 or M1.

[0033] In the above formula (1), the mesogenic group represented by M1 is a group that represents the main skeleton of the liquid crystal molecule that contributes to the formation of liquid crystals. The liquid crystal molecules exhibit liquid crystallinity, which is a state (mesophase) intermediate between a crystalline state and an isotropic liquid state. There are no particular limitations on the mesogenic group, and reference can be made to, for example, "Flussige Kristalle in Tabellen II" (VEB Deutsche Verlag fur Grundstoff Industrie, Leipzig, published in 1984), particularly pages 7 to 16, and "Liquid Crystal Handbook" edited by the Liquid Crystal Handbook Editorial Committee (Maruzen, published in 2000), particularly Chapter 3. The mesogenic group is preferably, for example, a group having at least one cyclic structure selected from the group consisting of an aromatic hydrocarbon group, a heterocyclic group, and an alicyclic group. The mesogenic group preferably has an aromatic hydrocarbon group, more preferably has 2 to 4 aromatic hydrocarbon groups, and even more preferably has 3 aromatic hydrocarbon groups, for reasons that the effects of the present invention are more excellent.

[0034] As the mesogenic group, from the viewpoints of the expression of liquid crystallinity, adjustment of the liquid crystal phase transition temperature, availability of raw materials, and suitability for synthesis, as well as from the viewpoint of achieving better effects of the present invention, a group represented by the following formula (M1-A) or (M1-B) is preferred, and a group represented by formula (M1-B) is more preferred.

[0035] [ka]

[0036] In formula (M1-A), A1 is a divalent group selected from the group consisting of an aromatic hydrocarbon group, a heterocyclic group, and an alicyclic group, which may be substituted with an alkyl group, a fluorinated alkyl group, an alkoxy group, or a substituent. The divalent group represented by A1 is preferably a 4- to 6-membered ring. The divalent group represented by A1 may be a monocyclic ring or a condensed ring. * indicates the binding position to SP1 or T1.

[0037] Examples of the divalent aromatic hydrocarbon group represented by A1 include a phenylene group, a naphthylene group, a fluorene-diyl group, an anthracene-diyl group, and a tetracene-diyl group. From the viewpoints of the diversity of mesogenic skeleton designs and the availability of raw materials, a phenylene group or a naphthylene group is preferred, and a phenylene group is more preferred.

[0038] The divalent heterocyclic group represented by A1 may be either aromatic or non-aromatic, but is preferably a divalent aromatic heterocyclic group from the viewpoint of further improving the degree of orientation. Atoms other than carbon that constitute a divalent aromatic heterocyclic group include a nitrogen atom, a sulfur atom, and an oxygen atom. When an aromatic heterocyclic group has multiple atoms that constitute the ring other than carbon, these atoms may be the same or different. Specific examples of the divalent aromatic heterocyclic group include a pyridylene group (pyridine-diyl group), a pyridazine-diyl group, an imidazole-diyl group, a thienylene (thiophene-diyl group), a quinolylene group (quinoline-diyl group), an isoquinolylene group (isoquinoline-diyl group), an oxazole-diyl group, a thiazole-diyl group, an oxadiazole-diyl group, a benzothiazole-diyl group, a benzothiadiazole-diyl group, a phthalimido-diyl group, a thienothiazole-diyl group, a thiazolothiazole-diyl group, a thienothiophene-diyl group, and a thienoxazole-diyl group.

[0039] Specific examples of the divalent alicyclic group represented by A1 include a cyclopentylene group and a cyclohexylene group.

[0040] In formula (M1-A), a1 represents an integer of 1 to 10. When a1 is 2 or more, multiple A1 may be the same or different.

[0041] In formula (M1-B), A2 and A3 each independently represent a divalent group selected from the group consisting of an aromatic hydrocarbon group, a heterocyclic group, and an alicyclic group. Specific examples and preferred embodiments of A2 and A3 are the same as those of A1 in formula (M1-A), and therefore, description thereof will be omitted. In formula (M1-B), a2 represents an integer of 1 to 10, and when a2 is 2 or greater, multiple A2s may be the same or different, multiple A3s may be the same or different, and multiple LA1s may be the same or different. a2 is preferably an integer of 2 or greater, and more preferably 2, for reasons of better effects of the present invention. In formula (M1-B), when a2 is 1, LA1 is a divalent linking group. When a2 is 2 or more, each of the multiple LA1 is independently a single bond or a divalent linking group, and at least one of the multiple LA1 is a divalent linking group. When a2 is 2, it is preferred that one of the two LA1 is a divalent linking group and the other is a single bond, because the effects of the present invention are more excellent.

[0042] In formula (M1-B), the divalent linking group represented by LA1 is -O-, -(CH2) g -, -(CF2) g -, -Si(CH3)2-, -(Si(CH3)2O) g -, -(OSi(CH3)2) g-(g represents an integer from 1 to 10.), -N(Z)-, -C(Z)=C(Z')-, -C(Z)=N-, -N=C(Z)-, -C(Z)2- C(Z')2-, -C(O)-, -OC(O)-, -C(O)O-, -OC(O)O-, -N(Z)C(O)-, -C(O)N(Z)-, - C(Z)=C(Z')-C(O)O-, -OC(O)-C(Z)=C(Z')-, -C(Z)=N-, -N=C(Z)-, -C(Z)=C (Z')-C(O)N(Z”)-, -N(Z”)-C(O)-C(Z)=C(Z')-, -C(Z)=C(Z')-C(O)-S-, -SC Examples include (O)-C(Z)=C(Z')-, -C(Z)=NN=C(Z')- (Z, Z', and Z" independently represent hydrogen, a C1 to C4 (carbon atom number 1 to 4) alkyl group, a cycloalkyl group, an aryl group, a cyano group, or a halogen atom), -C≡C-, -N=N-, -S-, -S(O)-, -S(O)(O)-, -(O)S(O)O-, -O(O)S(O)O-, -SC(O)-, and -C(O)S-. Of these, -C(O)O- is preferred because it provides better effects of the present invention. LA1 may be a group formed by combining two or more of these groups.

[0043] Specific examples of M1 include the following structures: In the specific examples below, "Ac" represents an acetyl group.

[0044] [ka]

[0045] [ka]

[0046] [ka]

[0047] [ka]

[0048] [ka]

[0049] [ka]

[0050] [ka]

[0051] T1 is preferably a polymerizable group, since this improves the adhesion to the adjacent layer and improves the cohesive strength of the film. The polymerizable group is not particularly limited, but is preferably a polymerizable group capable of radical polymerization or cationic polymerization. As the radical polymerizable group, a generally known radical polymerizable group can be used, and preferred examples include an acryloyl group or a methacryloyl group. In this case, it is known that the polymerization rate of an acryloyl group is generally fast, and from the viewpoint of improving productivity, an acryloyl group is preferred, but a methacryloyl group can also be used as the polymerizable group. As the cationically polymerizable group, a generally known cationically polymerizable group can be used, and specific examples thereof include an alicyclic ether group, a cyclic acetal group, a cyclic lactone group, a cyclic thioether group, a spiro orthoester group, and a vinyloxy group. Among these, an alicyclic ether group or a vinyloxy group is preferred, and an epoxy group, an oxetanyl group, or a vinyloxy group is more preferred.

[0052] The weight average molecular weight (Mw) of the polymerizable liquid crystal compound containing the repeating unit represented by the above formula (1) is preferably 1,000 to 500,000, more preferably 2,000 to 300,000, for reasons of better effects of the present invention. When the Mw of the polymerizable liquid crystal compound is within the above range, the polymerizable liquid crystal compound becomes easy to handle. In particular, from the viewpoint of suppressing cracks during application, the weight average molecular weight (Mw) of the polymerizable liquid crystal compound is preferably 10,000 or more, and more preferably 10,000 to 300,000. In addition, from the viewpoint of the temperature latitude of the degree of orientation, the weight average molecular weight (Mw) of the polymerizable liquid crystal compound is preferably less than 10,000, and more preferably 2,000 or more and less than 10,000. Here, the weight average molecular weight and number average molecular weight in the present invention are values ​​measured by gel permeation chromatography (GPC). Solvent (eluent): N-methylpyrrolidone ·Device name: TOSOH HLC-8220GPC Column: Three TOSOH TSKgel Super AWM-H (6 mm x 15 cm) columns connected together Column temperature: 25℃ Sample concentration: 0.1% by mass ·Flow rate: 0.35mL / min Calibration curve: TOSOH TSK standard polystyrene. Calibration curves are based on seven samples with Mw = 2,800,000 to 1,050 (Mw / Mn = 1.03 to 1.06).

[0053] In the present invention, the content of the polymerizable liquid crystal compound is preferably 8 to 99% by mass, more preferably 8 to 96% by mass, of the solid content in the liquid crystal composition. Here, the "solid content in the liquid crystal composition" refers to the components excluding the solvent, and specific examples of the solid content include the above-mentioned polymerizable liquid crystal compound, the dichroic dye compound described below, a polymerization initiator, a surfactant, etc.

[0054] [Dichroic dye compounds] The dichroic dye compound contained in the liquid crystal composition is not particularly limited, and examples thereof include 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 (e.g., quantum rods), and any conventionally known dichroic dye compound (dichroic dye) can be used. Specifically, for example, paragraphs

[0067] to

[0071] of Japanese Patent Application Laid-Open No. 2013-228706, paragraphs

[0008] to

[0026] of Japanese Patent Application Laid-Open No. 2013-227532, paragraphs

[0008] to

[0015] of Japanese Patent Application Laid-Open No. 2013-209367, paragraphs

[0045] to

[0058] of Japanese Patent Application Laid-Open No. 2013-109090, paragraphs

[0012] to

[0029] of Japanese Patent Application Laid-Open No. 2013-101328, 9】 to

[0017] paragraphs, JP 2013-037353 A paragraphs

[0051] to

[0065] , JP 2012-063387 A paragraphs

[0049] to

[0073] , JP 11-305036 A paragraphs

[0016] to

[0018] , JP 2001-133630 A paragraphs

[0009] to

[0011] , JP 2011-215337 A paragraphs

[0030] to

[0169] , JP 2010-106242 A paragraphs

[0021] to

[0022] 】 to

[0075] paragraphs,

[0011] to

[0025] paragraphs of JP 2010-215846 A,

[0017] to

[0069] paragraphs of JP 2011-048311 A,

[0013] to

[0133] paragraphs of JP 2011-213610 A,

[0074] to

[0246] paragraphs of JP 2011-237513 A,

[0005] to

[0051] paragraphs of JP 2016-006502 A, 【00

[05] to

[0041] of WO2016 / 136561, paragraphs

[0008] to

[0062] of WO2016 / 136561, paragraphs

[0014] to

[0033] of WO2017 / 154835, paragraphs

[0014] to

[0033] of WO2017 / 154695, paragraphs

[0013] to

[0037] of WO2017 / 195833, and paragraphs

[0014] to

[0034] of WO2018 / 164252.

[0055] In the present invention, two or more dichroic dye compounds may be used in combination. For example, from the viewpoint of making the resulting optically absorptive anisotropic film closer to black, it is preferable to use in combination at least one dichroic dye compound having a maximum absorption wavelength in the wavelength range of 370 nm or more and less than 500 nm and at least one dichroic dye compound having a maximum absorption wavelength in the wavelength range of 500 nm or more and less than 700 nm.

[0056] The dichroic dye compound may have a crosslinkable group. Specific examples of the crosslinkable group include a (meth)acryloyl group, an epoxy group, an oxetanyl group, and a styryl group, and among these, a (meth)acryloyl group is preferred.

[0057] From the viewpoint of achieving excellent effects of the present invention, the content of the dichroic dye compound is preferably 1 to 400 parts by mass, more preferably 2 to 100 parts by mass, and even more preferably 5 to 30 parts by mass, relative to 100 parts by mass of the polymerizable liquid crystal compound. The content of the dichroic dye compound is preferably 10% by mass or more, more preferably 15% by mass or more, of the solid content in the liquid crystal composition from the viewpoints of making the optically absorptive anisotropic film thin and increasing the degree of orientation, and is preferably 40% by mass or less, more preferably 30% by mass or less, of the solid content in the liquid crystal composition from the viewpoints of maintaining cohesive strength as a layer and flexibility. The content of the dichroic dye compound in the optically absorptive anisotropic film is preferably 15% by mass or more relative to the total mass of the optically absorptive anisotropic film, and although there is no particular upper limit, it is preferably 40% by mass or less.

[0058] From the viewpoint of achieving excellent effects of the present invention, it is preferable that the dichroic dye compound be oriented in a fixed direction in the optically absorptive anisotropic film. The method for aligning the dichroic dye compound is not particularly limited, but techniques for orienting the dichroic dye compound in the desired direction can be obtained by referring to techniques for fabricating polarizers using dichroic dye compounds and techniques for fabricating guest-host liquid crystal cells. For example, the techniques used in the methods for fabricating dichroic polarizing elements described in JP-A-11-305036 and JP-A-2002-090526, and the methods for fabricating guest-host liquid crystal displays described in JP-A-2002-99388 and JP-A-2016-27387, can also be used to fabricate the optically absorptive anisotropic film used in the present invention.

[0059] The liquid crystal composition may further contain components such as a polymerization initiator, a surfactant, and an adhesion improver.

[0060] [Polymerization initiator] The polymerization initiator to be used is not particularly limited, but is preferably a photosensitive compound, that is, a photopolymerization initiator. As the photopolymerization initiator, various compounds can be used without any particular limitation. Examples of the photopolymerization initiator include α-carbonyl compounds (U.S. Pat. Nos. 2,367,661 and 2,367,670), acyloin ethers (U.S. Pat. No. 2,448,828), α-hydrocarbon-substituted aromatic acyloin compounds (U.S. Pat. No. 2,722,512), polynuclear quinone compounds (U.S. Pat. Nos. 3,046,127 and 2,951,758), combinations of triarylimidazole dimers and p-aminophenyl ketones (U.S. Pat. No. 3,549,367), Examples of such compounds include acridine and phenazine compounds (Japanese Patent Laid-Open No. 60-105667 and U.S. Pat. No. 4,239,850), oxadiazole compounds (U.S. Pat. No. 4,212,970), o-acyloxime compounds (Japanese Patent Laid-Open No. 2016-027384, paragraph

[0065] ), and acylphosphine oxide compounds (Japanese Patent Publication No. 63-040799, Japanese Patent Publication No. 5-29234, Japanese Patent Laid-Open No. 10-095788, and Japanese Patent Laid-Open No. 10-029997). As such a photopolymerization initiator, commercially available products can be used, such as Irgacure-184, Irgacure-907, Irgacure-369, Irgacure-651, Irgacure-819, Irgacure-OXE-01, and Irgacure-OXE-02 manufactured by BASF.

[0061] When the liquid crystal composition contains a polymerization initiator, the content of the polymerization initiator is preferably 0.01 to 30 parts by mass, more preferably 0.1 to 15 parts by mass, relative to 100 parts by mass of the total of the dichroic dye compound and the liquid crystal compound in the liquid crystal composition. When the content of the polymerization initiator is 0.01 part by mass or more, the durability of the optically absorptive anisotropic film becomes good, and when it is 30 parts by mass or less, the degree of orientation of the optically absorptive anisotropic film becomes good. The polymerization initiator may be used alone or in combination of two or more. When two or more polymerization initiators are used, the total amount thereof is preferably within the above range.

[0062] [Surfactants] The liquid crystal composition preferably contains a surfactant. By including a surfactant, it is expected that the smoothness of the coating surface will be improved, the degree of orientation will be further improved, and repelling and unevenness will be suppressed, thereby improving in-plane uniformity. The surfactant may be one that aligns the dichroic dye compound and the liquid crystal compound horizontally or vertically on the coating surface. For example, the compounds described in paragraphs

[0155] to

[0170] of International Publication No. 2016 / 009648, the compounds described in paragraphs

[0253] to

[0293] of JP-A No. 2011-237513 (horizontal alignment agent), and the compounds described in paragraphs

[0071] to

[0097] of International Publication No. 2019 / 235355 (vertical alignment agent) can be used. Furthermore, polyacrylate surfactants or fluorine atom-containing surfactants are also preferred as surfactants.

[0063] The surfactant contained in the liquid crystal composition may be a fluorine-containing polymer having a repeating unit B1 represented by formula (B-1) described below and a repeating unit B2 having a fluorine atom.

[0064] (Repeating structure B1) The repeating unit B1 contained in the fluorine-containing polymer is a repeating unit represented by the following formula (B-1).

[0065] [ka]

[0066] In the above formula (B-1), R 1 represents a hydrogen atom, an alkyl group having 1 to 5 carbon atoms, or a halogen atom. Also, L 1 represents a single bond or -CO-. Furthermore, Sp represents a linear or branched divalent hydrocarbon group having 1 to 20 carbon atoms, provided that one or two or more non-adjacent -CH2- groups among the -CH2- groups constituting a part of the hydrocarbon group may each independently be substituted with -O-, -S-, -NH-, or -N(Q)-, and Q represents a substituent. L 2 and L 3 each independently represents a single bond or a divalent linking group.

[0067] R in the above formula (B-1) 1 is preferably a hydrogen atom or an alkyl group having 1 to 5 carbon atoms, and more preferably a hydrogen atom or a methyl group.

[0068] L in the above formula (B-1) 1 is preferably —CO—.

[0069] Examples of the linear or branched divalent hydrocarbon group having 1 to 20 carbon atoms represented by Sp in the above formula (B-1) include linear or branched divalent aliphatic hydrocarbon groups having 1 to 20 carbon atoms, divalent alicyclic hydrocarbon groups having 3 to 20 carbon atoms, divalent aromatic hydrocarbon groups having 6 to 20 carbon atoms, and divalent aromatic heterocyclic groups having 6 to 20 carbon atoms, and among these, linear or branched divalent aliphatic hydrocarbon groups having 1 to 20 carbon atoms are preferred. Here, the divalent aliphatic hydrocarbon group having 1 to 20 carbon atoms is preferably an alkylene group having 1 to 15 carbon atoms, more preferably an alkylene group having 1 to 8 carbon atoms, and specific examples thereof include a methylene group, an ethylene group, a propylene group, a butylene group, a pentylene group, a hexylene group, a methylhexylene group, and a heptylene group. As described above, Sp represents a -CH2- group constituting a part of a linear or branched divalent hydrocarbon group having 1 to 20 carbon atoms, in which one or two or more non-adjacent -CH2- groups may each independently be substituted with -O-, -S-, -NH-, or -N(Q)-. Examples of the substituent represented by Q include the substituent W described above, and among these, an alkyl group, an alkoxy group, or a halogen atom is preferred.

[0070] L in the above formula (B-1) 2 and L 3 Examples of the divalent linking group in one embodiment include -C(O)O-, -OC(O)-, -O-, -S-, and -C(O)NR L1 -, -NR L1 C(O)-, -SO2-, and -NR L1 R L2 In the formula, R L1 and R L2 each independently represents a hydrogen atom or an optionally substituted alkyl group having 1 to 6 carbon atoms. Examples of the substituent that the alkyl group having 1 to 6 carbon atoms may have include the aforementioned substituent W, and among these, an alkyl group, an alkoxy group, or a halogen atom is preferred.

[0071] In the formula (B-1), A represents a divalent linking group represented by any one of the following formulae (A-1) to (A-15): 2 or L 3 The carbon atoms constituting the ring structures in the following formulae (A-1) to (A-15) may be substituted with heteroatoms or may have a substituent. The substituents that the carbon atoms constituting the ring structures may have include the above-mentioned substituent W, and among them, an alkyl group, an alkoxy group, or a halogen atom is preferred.

[0072] [ka] JPEG0007727656000013.jpg33143 JPEG0007727656000014.jpg33136 JPEG0007727656000015.jpg26133 JPEG0007727656000016.jpg25105

[0073] Specific examples of the divalent linking group represented by any one of the above formulas (A-1) to (A-15) include a 1,4-phenylene group, a 1,4-cyclohexylene group, a 1,4-cyclohexenyl group, a tetrahydropyran-2,5-diyl group, a 1,4-piperazine group, a 1,4-piperidine group, a 1,3-dioxane-2,5-diyl group, a tetrahydrothiopyran-2,5-diyl group, a 1,4-bicyclo(2,2,2)octylene group, a decahydronaphthalene-2,6-diyl group, a pyridine-2,5-diyl group, and a pyrimidine-2,5-diyl group. diyl group, pyrazine-2,5-diyl group, 1,2,3,4-tetrahydronaphthalene-2,6-diyl group, 2,6-naphthylene group, phenanthrene-2,7-diyl group, 9,10-dihydrophenanthrene-2,7-diyl group, 1,2,3,4,4a,9,10a-octahydrophenanthrene-2,7-diyl group, 9-fluorenone-2,7-diyl, fluorene-2,7-diyl group, thienothiophene-3,6-diyl group, carbazole-3,6-diyl group, and carbazole-2,7-diyl group.

[0074] In the above formula (B-1), A is preferably a divalent linking group represented by any one of the above formulas (A-1), (A-4), (A-7), (A-10) and (A-13), and more preferably a divalent linking group represented by any one of the above formulas (A-7) and (A-13), because this results in a higher degree of orientation of the optically absorptive anisotropic film that is formed.

[0075] In the formula (B-1), D represents a hydrogen-bonding group composed of a hydrogen atom and a non-metallic atom of Groups 14 to 16. However, the non-metallic atom may have a substituent. Here, examples of non-metallic atoms of Groups 14 to 16 include oxygen atoms, sulfur atoms, nitrogen atoms, and carbon atoms. Furthermore, examples of substituents that non-metal atoms (particularly, nitrogen atoms and carbon atoms) may have include halogen atoms, alkyl groups, alkoxy groups, alkyl-substituted alkoxy groups, cyclic alkyl groups, aryl groups (e.g., phenyl groups, naphthyl groups, etc.), cyano groups, amino groups, nitro groups, alkylcarbonyl groups, sulfo groups, and hydroxyl groups.

[0076] Such hydrogen-bonding groups include, for example, hydrogen-bond donating groups and hydrogen-bond accepting groups. Specific examples of the hydrogen bond donor group include an amino group, an amide group, a urea group, a urethane group, a sulfonylamino group, a sulfo group, a phospho group, a hydroxy group, a mercapto group, a carboxyl group, a methylene group substituted with an electron-withdrawing group, and a methine group substituted with an electron-withdrawing group, and among these, a carboxyl group and an amide group are preferred. Specific examples of the hydrogen bond accepting group include a heteroatom having an unshared electron pair on a heterocycle, a hydroxy group, an aldehyde group, a ketone group, a carboxyl group, a carboxylic acid ester group, a carboxylic acid amide group, a lactone group, a lactam group, a sulfonic acid amide group, a sulfo group, a phospho group, a phosphoric acid amide group, a urethane group, a urea group, an ether structure (particularly a polymer structure having an oxygen atom contained in a polyether structure), an aliphatic amine group, and an aromatic amine group, and among these, a carboxyl group or an amide group is preferred.

[0077] (Repeated structure B2) The repeating unit B2 of the fluorine-containing polymer is a repeating unit containing a fluorine atom.

[0078] In the present invention, the content of repeating structure B2 is preferably 15 to 90 mass %, more preferably 20 to 80 mass %, and even more preferably 30 to 70 mass %, relative to the total mass of the surfactant, because this results in a higher degree of orientation in the optically absorptive anisotropic film that is formed. The surfactant may contain one type of repeating structure B2 alone or two or more types of repeating structure B2. When two or more types of repeating structure B2 are contained, the content of the repeating structure B2 refers to the total content of the repeating structure B2.

[0079] (Repeated structure B3) In the present invention, in order to improve the coatability of the upper layer on the optically absorptive anisotropic film to be formed, it is preferable that the fluorine-containing polymer further contains, in addition to the repeating structures B1 and B2 described above, a repeating structure B3 derived from a monomer having a molecular weight of 300 or less.

[0080] The repeating structure B3 is preferably a repeating structure represented by the following formula (N-1), because this improves the coatability of the upper layer on the optically absorptive anisotropic film to be formed. The repeating structure B3 preferably has a structure different from the repeating structure B2 described above and does not contain a fluorine atom.

[0081] [ka]

[0082] In formula (N-1), R B11 and R B12 each independently represents a hydrogen atom or a substituent, provided that R B11 and R B12 is a substituent, R B11 and R B12 may be linked to form a ring.

[0083] R B11 Molecular weight and R B12 The total molecular weight of the repeating units B3 is preferably 200 or less, more preferably 100 or less, and even more preferably 70 or less. When the total molecular weight is 100 or less, the interaction between the repeating units B3 is further improved, and the compatibility between the surfactant and the liquid crystal molecules can be further reduced. This results in a light absorption anisotropy film with few alignment defects and an excellent degree of alignment. R B11 Molecular weight and R B12 The lower limit of the total molecular weight of the above is preferably 2 or more.

[0084] R B11 and R B12 The substituent represented by is preferably an organic group, more preferably an organic group having 1 to 15 carbon atoms, further preferably an organic group having 1 to 12 carbon atoms, and particularly preferably an organic group having 1 to 8 carbon atoms, in terms of achieving better effects of the present invention. Examples of the organic group include a linear, branched, or cyclic alkyl group, an aromatic hydrocarbon group, and a heterocyclic group.

[0085] The alkyl group preferably has 1 to 15 carbon atoms, more preferably 1 to 12 carbon atoms, and even more preferably 1 to 8 carbon atoms. The carbon atoms of the alkyl group are -O-, -Si(CH3)2-, and -(Si(CH3)2O). g -, -(OSi(CH3)2) g-(g represents an integer from 1 to 10.), -N(Z)-, -C(Z)=C(Z')-, -C(Z)=N-, -N=C(Z)-, -C(O)-, -OC( O)-, -C(O)O-, -OC(O)O-, -N(Z)C(O)-, -C(O)N(Z)-, -C(Z)=C(Z')-C(O)O-, -OC(O )-C(Z)=C(Z')-, -C(Z)=N-, -N=C(Z)-, -C(Z)=C(Z')-C(O)N(Z”)-, -N(Z”)-C(O) -C(Z)=C(Z')-, -C(Z)=C(Z')-C(O)-S-, -SC(O)-C(Z)=C(Z')-, -C(Z)=NN=C(Z')- (Z, Z', and Z" each independently represent a hydrogen atom, an alkyl group having 1 to 4 carbon atoms, a cycloalkyl group, an aryl group, a cyano group, or a halogen atom.) -C≡C-, -N=N-, -S-, -C(S)-, -S(O)-, -SO2-, -(O)S(O)O-, -O(O)S(O)O-, -SC(O)-, and -C(O)S-, as well as groups formed by combining two or more of these groups. Among groups with which a carbon atom of the alkyl group may be substituted, -O-, -C(O)-, -N(Z)-, -OC(O)-, or -C(O)O- is preferred in terms of achieving better effects for the present invention. A hydrogen atom of the alkyl group may be substituted with a halogen atom, a cyano group, an aryl group, a nitro group, -OZH, -C(O)ZH, -C(O)OZH, -OC(O)ZH, -OC(O)OZH, -NZHZH', -NZHC(O)ZH', -NZHC(O)OZH', -C(O)NZHZH', -OC(O)NZHZH', -NZHC(O)NZH'OZH'', -SZH, -C(S)ZH, -C(O)SZH, or -SC(O)ZH. ZH, ZH', and ZH'' each independently represent a hydrogen atom, a halogen atom, an alkyl group having 1 to 10 carbon atoms, a cyano group, or a nitro group. Among the groups with which the hydrogen atom of the alkyl group may be substituted, -OH, -COOH, or an aryl group (a phenyl group is preferred) are preferred in terms of achieving better effects of the present invention.

[0086] The hydrogen atoms of the aromatic hydrocarbon group and the hydrogen atoms of the heterocyclic group may be substituted with a halogen atom, a cyano group, an alkyl group having 1 to 10 carbon atoms, a cyano group, a nitro group, -OZH, -C(O)ZH, -C(O)OZH, -OC(O)ZH, -OC(O)OZH, -NZHZH', -NZHC(O)ZH', -NZHC(O)OZH', -C(O)NZHZH', -OC(O)NZHZH', -NZHC(O)NZH'OZH'', -SZH, -C(S)ZH, -C(O)SZH, -SC(O)ZH, or -B(OH). ZH, ZH', and ZH'' each independently represent a hydrogen atom, a halogen atom, an alkyl group having 1 to 10 carbon atoms, a cyano group, or a nitro group. Among the groups that may be substituted for the hydrogen atom of the aromatic hydrocarbon group and the hydrogen atom of the heterocyclic group, -OH and -B(OH)2 are preferred in terms of achieving better effects of the present invention.

[0087] R B11 and R B12 are each independently preferably a hydrogen atom or an organic group having 1 to 15 carbon atoms, in terms of achieving better effects of the present invention. Preferred embodiments of the organic group are as described above. From the viewpoint of the better effect of the present invention, R B11 and R B12 At least one of the groups is preferably a substituent, and at least one of the groups is more preferably an organic group having 1 to 15 carbon atoms.

[0088] R B11 and R B12 The ring formed by linking is a heterocycle containing the nitrogen atom in formula (N-1), and may further contain heteroatoms such as oxygen, sulfur and nitrogen atoms within the ring. R B11 and R B12 The ring formed by linking is preferably a 4- to 8-membered ring, more preferably a 5- to 7-membered ring, and even more preferably a 5- or 6-membered ring, in terms of achieving better effects of the present invention. R B11 and R B12The number of carbon atoms constituting the ring formed by linking the groups is preferably 3 to 7, more preferably 3 to 6, in terms of achieving better effects of the present invention. R B11 and R B12 The ring formed by linking may or may not have aromaticity, but it is preferable that it does not have aromaticity in terms of better effects of the present invention. R B11 and R B12 Specific examples of the ring formed by linking the groups include the following groups.

[0089] [ka]

[0090] R B13 represents a hydrogen atom, an alkyl group having 1 to 5 carbon atoms, a halogen atom or a cyano group, and among these, a hydrogen atom or an alkyl group having 1 to 5 carbon atoms is preferred, and a hydrogen atom is more preferred. The alkyl group has 1 to 5 carbon atoms, preferably 1 to 3 carbon atoms, and more preferably 1. The alkyl group may have any of a linear, branched, and cyclic structure.

[0091] Specific examples of the repeating structure B3 are shown below, but the repeating structure B3 is not limited to the following structures.

[0092] [ka]

[0093] The content of repeating structure B3 is preferably 3 to 75 mass%, more preferably 15 to 70 mass%, and even more preferably 20 to 65 mass%, based on the total mass of all repeating structures of the fluorine-containing polymer. When the content of repeating structure B3 is within the above range, the effects of the present invention are more excellent. The surfactant may contain one type of repeating structure B3 alone or two or more types of repeating structure B3. When two or more types of repeating structure B3 are contained, the content of the repeating structure B3 refers to the total content of the repeating structure B3.

[0094] (Another repeating structure (part 1)) The above fluorine-containing polymer may further have a repeating unit represented by the following general formula (M-3).

[0095] [ka]

[0096] In the above formula (M-3), R3 represents a hydrogen atom, a fluorine atom, a chlorine atom, or an alkyl group having 1 to 20 carbon atoms, L3 represents a single bond or a divalent linking group, and T3 represents an aromatic ring. The linking group for L3 is preferably a single bond or a linear, branched, or cyclic alkylene group having 1 to 10 carbon atoms. A carbon atom of the alkylene group may be substituted with -O-, -S-, -N(Z)-, -C(Z)=C(Z')-, -C(O)-, -C(S)-, -OC(O)-, -OC(S)-, -SC(O)-, -C(O)O-, -C(S)O-, -C(O)S-, -OC(O)O-, -N(Z)C(O)-, or -C(O)N(Z)- (Z and Z' each independently represent a hydrogen atom, an alkyl group having 1 to 4 carbon atoms, a cycloalkyl group, an aryl group, a cyano group, or a halogen atom). A hydrogen atom of the alkylene group may be substituted with a fluorine atom or a fluoroalkyl group. Examples of the aromatic ring group of T3 include aromatic hydrocarbon ring groups such as a benzene ring group, a naphthalene ring group, an anthracene ring group, and a phenanthroline ring group; and aromatic heterocyclic groups such as a furan ring group, a pyrrole ring group, a thiophene ring group, a pyridine ring group, a thiazole ring group, and a benzothiazole ring group. Among these, a benzene ring group (e.g., a 1,4-phenyl group) is preferred. By including these groups in the polymer, compatibility can be improved.

[0097] Specific examples of the monomer that forms the repeating structure represented by the above formula (M-3) include the monomers represented by the following formulas (M3-1) to (M3-5), but the present invention is not limited to these.

[0098] [ka]

[0099] (Other repeating structures (part 2)) The above fluorine-containing polymer may further have a repeating unit represented by the following general formula (M-4).

[0100] [ka]

[0101] In the above formula (M-4), R4 represents a hydrogen atom, a fluorine atom, a chlorine atom, or an alkyl group having 1 to 20 carbon atoms, L4 represents a single bond or a divalent linking group, and Q4 represents any of the crosslinkable groups represented by the following formulas (P1) to (P30). R in formulas (P1) to (P30) Pis a hydrogen atom, a halogen atom, a linear, branched or cyclic alkylene group having 1 to 10 carbon atoms, a halogenated alkyl group having 1 to 20 carbon atoms, an alkoxy group having 1 to 20 carbon atoms, an alkenyl group having 1 to 20 carbon atoms, an alkynyl group having 1 to 20 carbon atoms, an aryl group having 1 to 20 carbon atoms, a heterocyclic group (which may also be called a heterocyclic group), cyano group, hydroxy group, nitro group, carboxy group, aryloxy group, silyloxy group, heterocyclic oxy group, acyloxy group, carbamoyloxy group, alkoxycarbonyloxy group, aryloxycarbonyloxy group, amino group (including anilino group), ammonio group, acylamino group, aminocarbonylamino group, alkoxycarbonylamino group, aryloxycarbonyl group, a methylamino group, a sulfamoylamino group, an alkyl or arylsulfonylamino group, a mercapto group, an alkylthio group, an arylthio group, a heterocyclic thio group, a sulfamoyl group, a sulfo group, an alkyl or arylsulfinyl group, an alkyl or arylsulfonyl group, an acyl group, an aryloxycarbonyl group, an alkoxycarbonyl group, a carbamoyl group, an aryl or heterocyclic azo group, an imido group, a phosphino group, a phosphinyl group, a phosphinyloxy group, a phosphinylamino group, a phosphono group, a silyl group, a hydrazino group, a ureido group, a boronic acid group (-B(OH)2), a phosphato group (-OPO(OH)2), or a sulfato group (-OSO3H); P may be the same or different.

[0102] [ka]

[0103] Examples of the linking group for L4 include aromatic hydrocarbon groups having 4 to 20 carbon atoms, cyclic alkylene groups having 4 to 20 carbon atoms, and heterocyclic groups having 1 to 20 carbon atoms. Of these, linear, branched, or cyclic alkylene groups having 1 to 20 carbon atoms and aromatic hydrocarbon groups having 4 to 20 carbon atoms are preferred, and it is preferable that they have -O-, -CO-O-, -CO-NH-, or -O-CO-.

[0104] When Q4 represents a group containing a cationically polymerizable group, the cationically polymerizable group is not particularly limited, and examples thereof include an alicyclic ether group, a cyclic acetal group, a cyclic lactone group, a cyclic thioether group, a spiro orthoester group, and a vinyloxy group. The cationic polymerizable group is preferably an alicyclic ether group or a vinyloxy group, more preferably an epoxy group, an oxetanyl group or a vinyloxy group, even more preferably an epoxy group or an oxetanyl group, and particularly preferably an epoxy group. The epoxy group is particularly preferably an alicyclic epoxy group. Each of the above groups may have a substituent. When Q4 represents a group containing a radical polymerizable group, the radical polymerizable group is not particularly limited, and examples thereof include groups containing a polymerizable carbon-carbon double bond, specifically, (meth)acryloyl group, (meth)acryloyloxy group, (meth)acrylamide group, vinyl group, styryl group, allyl group, etc., and (meth)acryloyloxy group is preferred. Note that each of the above groups may have a substituent. By containing these groups, for example, when a plurality of layers are laminated in the optical film described below, the adhesion between layers can be improved.

[0105] Specific examples of the monomer that forms the repeating structure represented by formula (M-4) above include the monomers represented by formulas (M4-1) to (M4-17) below, but the present invention is not limited to these.

[0106] [ka]

[0107] The fluorine-containing polymer may be a polymer having a block structure, a graft structure, a branch structure, or a star structure, which is preferable in that the fluorine atom groups exist as agglomerates, improving the migration of the polymer to the coating film surface. Furthermore, in copolymers having a random structure in which the fluorine-substituted alkyl chain length is 1 to 4, the fluorine atom groups are small in agglomerates, and although they have excellent solubility in common solvents, they have low migration to the coating film surface. On the other hand, the above polymers have high migration to the coating film surface even when the fluorine-substituted alkyl chain length is 1 to 4, due to the presence of the fluorine atom groups as agglomerates. Adding such copolymers to the composition is preferred because it reduces the surface tension of the coating film and improves the wettability of the composition to the substrate during coating (uniform coatability) and the surface condition of the coating film.

[0108] When the liquid crystal composition contains a surfactant, the content of the surfactant is preferably 0.001 to 5 parts by mass, more preferably 0.01 to 3 parts by mass, per 100 parts by mass of the total of the dichroic dye compound and the liquid crystal compound in the liquid crystal composition. The surfactant may be used alone or in combination of two or more. When two or more surfactants are used, the total amount thereof is preferably within the above range.

[0109] [Adhesion improver] The liquid crystal composition may contain an adhesion improver from the viewpoint of adhesion to a protective layer described later. Examples of the adhesion improver include compounds containing a hydroxyl group, a carboxyl group, or a boronic acid group, and compounds containing a boronic acid group are preferred. Suitable examples of the compound containing a boronic acid group include compounds represented by the following formula:

[0110] [ka]

[0111] (In the formula, R 1 and R 2 R each independently represents a hydrogen atom, or a substituted or unsubstituted aliphatic hydrocarbon group, aryl group, or heterocyclic group. 3 represents a substituent containing a functional group capable of bonding to a (meth)acrylic group.

[0112] [solvent] From the viewpoint of workability and the like, the liquid crystal composition preferably contains a solvent. Examples of the solvent include ketones (e.g., acetone, 2-butanone, methyl isobutyl ketone, cyclopentanone, cyclohexanone, etc.), ethers (e.g., dioxane, tetrahydrofuran, 2-methyltetrahydrofuran, cyclopentyl methyl ether, tetrahydropyran, dioxolane, etc.), aliphatic hydrocarbons (e.g., hexane, etc.), alicyclic hydrocarbons (e.g., cyclohexane, etc.), aromatic hydrocarbons (e.g., benzene, toluene, xylene, trimethylbenzene, etc.), halogenated carbons (e.g., dichloromethane, trichloromethane, dichloroethane, dichlorobenzene, chlorotoluene, etc.), esters (e.g., acetic acid, Examples of suitable solvents include organic solvents such as methyl acetate, ethyl acetate, butyl acetate, ethyl lactate, etc., alcohols (e.g., ethanol, isopropanol, butanol, cyclohexanol, isopentyl alcohol, neopentyl alcohol, diacetone alcohol, benzyl alcohol, etc.), cellosolves (e.g., methyl cellosolve, ethyl cellosolve, 1,2-dimethoxyethane, etc.), cellosolve acetates, sulfoxides (e.g., dimethyl sulfoxide, etc.), amides (e.g., dimethylformamide, dimethylacetamide, N-methylpyrrolidone, N-ethylpyrrolidone, etc.), and heterocyclic compounds (e.g., pyridine, etc.), as well as water. These solvents may be used alone or in combination of two or more. Of these solvents, ketones (particularly cyclopentanone and cyclohexanone), ethers (particularly tetrahydrofuran, cyclopentyl methyl ether, tetrahydropyran, and dioxolane), and amides (particularly dimethylformamide, dimethylacetamide, N-methylpyrrolidone, and N-ethylpyrrolidone) are preferred from the viewpoint of utilizing the effect of excellent solubility of the liquid crystal composition.

[0113] When the liquid crystal composition contains a solvent, the content of the solvent is preferably 80 to 99 mass %, more preferably 83 to 97 mass %, and even more preferably 85 to 95 mass %, relative to the total mass of the liquid crystal composition. The solvent may be used alone or in combination of two or more. When two or more solvents are used, the total amount thereof is preferably within the above range.

[0114] There is no limitation on the thickness of the optically absorptive anisotropic film, and the thickness may be appropriately set to obtain the required polarization characteristics depending on the forming material and the like. The thickness of the optically absorptive anisotropic film is preferably 0.1 to 5 μm, more preferably 0.3 to 2.5 μm. As will be described later, if the optically absorptive anisotropic film has a step (thickness distribution), the above-mentioned thickness is the thickness at the thickest point.

[0115] <Method for forming an optically absorbing anisotropic film> There is no limitation on the method for forming the optically absorptive anisotropic film using the liquid crystal composition described above, and various known film-forming methods using the composition can be used. An example of a method for forming an optically absorptive anisotropic film is a method including, in this order, a step of applying the above-described liquid crystal composition onto a support to form a coating film, and a step of orienting the liquid crystal compound contained in the coating film. In the following description, the step of applying the liquid crystal composition onto a support to form a coating film is also referred to as the "coating film forming step." The step of orienting the liquid crystal compound contained in the coating film is also referred to as the "orientation step." The liquid crystal compound is a component that includes not only the above-mentioned liquid crystal compounds, but also dichroic dye compounds having liquid crystal properties when the above-mentioned dichroic dye compounds have liquid crystal properties.

[0116] Here, in the display device of the present invention, the optically absorptive anisotropic film of the optical film has, within the same film plane, a region A in which the inclination of the absorption axis relative to the film plane is θA and a region B in which the inclination of the absorption axis relative to the film plane is θB, and θA and θB satisfy the relationships of the following formulas (1) and (2). |θA - θB| ≧ 10° Equation (1) 0°≦ θB ≦ 5° Equation (2) Therefore, the optically absorptive anisotropic film is formed with a pattern on the same film surface, forming regions A and B. This pattern formation will be described in detail later.

[0117] [Coating film forming process] The coating film forming step is a step of applying the liquid crystal composition to a support to form a coating film. By using a liquid crystal composition containing the above-mentioned solvent or by using a liquid crystal composition that has been converted into a liquid such as a molten liquid by heating or the like, it becomes easier to apply the liquid crystal composition onto a support. Specific examples of the method for applying the liquid crystal composition include known methods such as roll coating, gravure printing, spin coating, wire bar coating, extrusion coating, direct gravure coating, reverse gravure coating, die coating, spraying, and inkjet printing. In this example, the liquid crystal composition is coated on a support, but this is not limited to this. For example, the liquid crystal composition may be coated on an alignment film provided on a support. The alignment film will be described later.

[0118] [Orientation step] The alignment step is a step of aligning the liquid crystal compound contained in the coating film. The orientation step may include a drying treatment. By the drying treatment, components such as the solvent can be removed from the coating film. The drying treatment may be carried out by leaving the coating film at room temperature for a predetermined time (for example, natural drying), or by heating and / or blowing air. Here, the liquid crystal compound contained in the liquid crystal composition may be aligned by the above-mentioned coating film forming step or drying treatment. In this case, for example, in an embodiment in which the liquid crystal composition is prepared as a coating liquid containing a solvent, the coating film is dried to remove the solvent from the coating film, thereby obtaining a polarizing layer. When the drying treatment is carried out at a temperature equal to or higher than the transition temperature of the liquid crystal compound contained in the coating film to the liquid crystal phase, the heating treatment described below does not need to be carried out.

[0119] The transition temperature of the liquid crystal compound contained in the coating film to the liquid crystal phase is preferably 10 to 250°C, more preferably 25 to 190°C, from the viewpoint of manufacturability, etc. A transition temperature of 10°C or higher is preferred because it does not require a cooling process or the like to lower the temperature to the temperature range in which the liquid crystal phase is exhibited. Furthermore, a transition temperature of 250°C or lower is preferred because it does not require a high temperature even when the film is once converted to an isotropic liquid state at a temperature higher than the temperature range in which the liquid crystal phase is exhibited, thereby reducing waste of thermal energy and deformation and deterioration of the substrate.

[0120] The alignment step preferably includes a heat treatment, which can align the liquid crystal compound contained in the coating film, and therefore the coating film after the heat treatment can be suitably used as an optically absorptive anisotropic film. There are no limitations on the temperature and time of the heat treatment, and the treatment temperature and time may be appropriately set so as to suitably align the liquid crystal compound depending on the liquid crystal compound and dichroic dye contained in the coating film. From the viewpoint of manufacturability, the heat treatment temperature is preferably 10 to 250°C, more preferably 25 to 190°C. The heating time is preferably 1 to 300 seconds, more preferably 1 to 60 seconds.

[0121] The alignment step may include a cooling treatment carried out after the heating treatment. The cooling treatment is a treatment for cooling the coated film after heating to about room temperature (about 20 to 25°C). This allows the alignment of the liquid crystal compound contained in the coated film to be fixed. There is no limitation on the cooling method, and various known methods for cooling sheet-like materials can be used.

[0122] By combining the above steps with a pattern forming method described later, it is possible to form an optically absorptive anisotropic film having a region A and a region B with different absorption axes in the plane. In the above-mentioned examples, drying treatment, heating treatment, etc. are given as methods for aligning the liquid crystal compound contained in the coating film, but in the present invention, the method for aligning the liquid crystal compound is not limited to these, and can be carried out by any known alignment treatment.

[0123] [Curing process] In the formation of the optically absorptive anisotropic film, a curing step of curing the optically absorptive anisotropic film may be included after the above-mentioned alignment step. The curing step is carried out, for example, by heating and / or light irradiation (exposure), and among these, the curing step is preferably carried out by light irradiation. The light source used for curing can be various light sources such as infrared light, visible light, and ultraviolet light, but ultraviolet light is preferred. Furthermore, ultraviolet light may be irradiated while heating during curing, or ultraviolet light may be irradiated through a filter that transmits only specific wavelengths. When irradiating with ultraviolet light or the like while heating, there is no limitation on the heating temperature, and it may be set appropriately depending on the transition temperature to the liquid crystal phase of the liquid crystal compound contained in the optically absorptive anisotropic film, etc. The heating temperature is preferably 25 to 140°C.

[0124] Furthermore, the light irradiation in the curing step may be carried out in a nitrogen atmosphere. When the curing of the optically absorptive anisotropic film proceeds by radical polymerization, it is preferable to carry out the light irradiation in a nitrogen atmosphere, since this reduces inhibition of polymerization by oxygen.

[0125] As described above, the optical film of the present invention includes the optically absorptive anisotropic film, but may also include other layers such as a transparent support, an alignment film, an oxygen-blocking layer, and a surface protective layer in addition to the optically absorptive anisotropic film. For example, it preferably includes at least one alignment film and at least one optically absorptive anisotropic film, and more preferably includes at least one oxygen-blocking layer in addition to the alignment film and the optically absorptive anisotropic film.

[0126] Each layer of the optical film will be described below.

[0127] [Transparent support] The transparent support is not particularly limited, and a commonly used polymer film (for example, a polarizer protective film) or a glass substrate can be used. For applications requiring flexibility, a polymer film or a glass substrate of 100 μm or less is preferably used. Specific examples of polymers that make up polymer films include cellulose-based polymers; acrylic polymers having acrylic ester polymers such as polymethyl methacrylate and lactone ring-containing polymers; thermoplastic norbornene-based polymers; polycarbonate-based polymers; polyester-based polymers such as polyethylene terephthalate and polyethylene naphthalate; styrene-based polymers such as polystyrene and acrylonitrile-styrene copolymer (AS resin); polyolefin-based polymers such as polyethylene, polypropylene, and ethylene-propylene copolymer; vinyl chloride-based polymers; amide-based polymers such as nylon and aromatic polyamide; imide-based polymers; sulfone-based polymers; polyethersulfone-based polymers; polyetheretherketone-based polymers; polyphenylene sulfide-based polymers; vinylidene chloride-based polymers; vinyl alcohol-based polymers; vinyl butyral-based polymers; arylate-based polymers; polyoxymethylene-based polymers; epoxy-based polymers; or mixtures of these polymers.

[0128] Among these, cellulose-based polymers (hereinafter also referred to as "cellulose acylate"), typified by triacetyl cellulose, can be preferably used. In addition, from the viewpoint of processability and optical performance, it is also preferable to use an acrylic polymer. Examples of acrylic polymers include polymethyl methacrylate and lactone ring-containing polymers described in paragraphs

[0017] to

[0107] of JP-A No. 2009-098605.

[0129] In the present invention, from the viewpoint of achieving a thinner optical film, an embodiment in which the transparent support is peeled off from the optical film is also preferred. In an embodiment in which a peelable polymer film is used, a cellulose-based polymer or a polyester-based polymer can be preferably used.

[0130] In the present invention, the transparent support is preferably transparent. Here, the term "transparent" in the present invention means that the transmittance of visible light is 60% or more, preferably 80% or more, and particularly preferably 90% or more.

[0131] The thickness of the transparent support is not particularly limited, but is preferably 40 μm or less for reasons such as enabling the thickness of the optical laminate to be thin, etc. The lower limit is not particularly limited, but is usually 5 μm or more.

[0132] [Alignment film] Examples of the type of alignment film include a photo-alignment layer and a rubbing treatment alignment layer. Among them, a photo-alignment layer is preferred because the effect of the present invention is more excellent. Examples of the photo-alignment layer include the examples described in paragraphs

[0018] to

[0078] of International Publication No. 2020 / 179864.

[0133] [Oxygen barrier layer] The optical film may have an oxygen barrier layer for the purpose of improving durability, and preferably has the oxygen barrier layer on the side of the optically absorptive anisotropic film opposite to the alignment film. Here, the oxygen-blocking layer is an oxygen-blocking film that has an oxygen-blocking function, and specific examples include layers containing organic compounds such as polyvinyl alcohol, polyethylene vinyl alcohol, polyvinyl ether, polyvinylpyrrolidone, polyacrylamide, polyacrylic acid, cellulose ether, polyamide, polyimide, styrene / maleic acid copolymer, gelatin, vinylidene chloride, and cellulose nanofiber.

[0134] In this specification, the oxygen blocking function is not limited to a state in which no oxygen passes through, but also includes a state in which some oxygen passes through depending on the desired performance.

[0135] When an oxygen-blocking layer is provided on a transparent polymer film and the above-mentioned photo-alignment layer is provided on top of that, it is preferable to use polyvinyl alcohol with a saponification degree of 95 mol% or more or modified polyvinyl alcohol with a saponification degree of 95 mol% or more for the oxygen-blocking layer in order to enhance alignment.

[0136] Further examples include thin layers made of metal compounds (metal compound thin layers). Any method can be used to form the metal compound thin layer as long as it can form the desired thin layer. For example, sputtering, vacuum deposition, ion plating, and plasma CVD (Chemical Vapor Deposition) are suitable, and specifically, the formation methods described in Japanese Patent No. 3400324, JP 2002-322561 A, and JP 2002-361774 A can be used.

[0137] The components contained in the metal compound thin layer are not particularly limited as long as they can exhibit oxygen blocking properties, but for example, oxides, nitrides, or oxynitrides containing one or more metals selected from Si, Al, In, Sn, Zn, Ti, Cu, Ce, Ta, etc. can be used. Among these, oxides, nitrides, or oxynitrides of metals selected from Si, Al, In, Sn, Zn, and Ti are preferred, and metal oxides, nitrides, or oxynitrides selected from Si, Al, Sn, and Ti are particularly preferred. These may contain other elements as secondary components.

[0138] The oxygen barrier layer may be in the form of a laminate of a layer containing the organic material and a thin layer of a metal compound, as described in, for example, U.S. Pat. No. 6,413,645, JP 2015-226995 A, JP 2013-202971 A, JP 2003-335880 A, JP 53-012953 B, and JP 58-217344 A, or may be a hybrid layer of an organic compound and an inorganic compound, as described in WO 2011 / 11836 A, JP 2013-248832 A, and Japanese Patent No. 3,855,004 B.

[0139] When the optical laminate of the present invention has a λ / 4 plate described later, and the λ / 4 plate is a retardation film having an optically anisotropic layer having λ / 4 function provided on a support, the oxygen-blocking layer may also serve as an alignment layer for the optically anisotropic layer having λ / 4 function. In such a case, the oxygen-blocking layer preferably contains polyvinyl alcohol, polyamide, or polyimide.

[0140] [Thickness of oxygen barrier layer] The thickness of the oxygen-blocking layer is not particularly limited, but in the case of a layer containing an organic compound, the thickness is preferably 0.1 to 10 μm, more preferably 0.5 to 5.5 μm, because the effects of the present invention are more excellent. In the case of a thin metal compound layer, the thickness of the oxygen-blocking layer is preferably 5 to 500 nm, more preferably 10 to 200 nm, because the effects of the present invention are more excellent.

[0141] [Protective layer] The optical film of the present invention may have a surface protective layer on the most visible side. The surface protective layer is not limited as long as it has the function of protecting the surface. It may be a single layer, but multiple layers are also preferred. High hardness is preferred, but high recovery is also preferred. A low-reflection layer that suppresses surface reflection occurring at the air interface is also preferred. A preferred embodiment is a structure of a transparent support and a surface coating layer. The transparent support may be the same as those described above for the transparent support. The surface coating layer will be described below.

[0142] [Surface coating layer] The surface coating layer may be at least one selected from the group consisting of an anti-reflection layer, an anti-glare layer, and a hard coating layer. Known layer materials are used for these layers. Note that these layers may be stacked in multiple layers.

[0143] Unlike the anti-reflection plates of so-called circular polarizers, the anti-reflection layer refers to a structure that reduces reflection by using a structure that utilizes light interference. In its simplest configuration, the anti-reflection layer may be composed only of a low refractive index layer. To further reduce reflectance, it is preferable to configure the anti-reflection layer by combining a high refractive index layer with a low refractive index layer. Configuration examples include a two-layer structure consisting of a high refractive index layer and a low refractive index layer, and a three-layer structure consisting of three layers with different refractive indices stacked in the order of a medium refractive index layer (a layer with a higher refractive index than the lower layer and a lower refractive index than the high refractive index layer), a high refractive index layer, and a low refractive index layer. Laminating of even more anti-reflection layers has also been proposed. In particular, from the viewpoints of durability, optical properties, cost, productivity, etc., it is preferable to have a medium refractive index layer / high refractive index layer / low refractive index layer in this order on the hard coat layer. Examples of such structures include those described in JP-A-8-122504, JP-A-8-110401, JP-A-10-300902, JP-A-2002-243906, and JP-A-2000-111706. Furthermore, a three-layer antireflection film with excellent robustness against film thickness fluctuations is described in JP-A-2008-262187. When the above three-layer antireflection film is installed on the surface of an image display device, it can achieve an average reflectance of 0.5% or less, significantly reduce glare, and produce images with excellent three-dimensional effect. In addition, each layer may be given other functions, such as an antifouling low refractive index layer, an antistatic high refractive index layer, an antistatic hard coat layer, or an antiglare hard coat layer (e.g., JP-A-10-206603, JP-A-2002-243906, JP-A-2007-264113, etc.). As one embodiment of the present invention, the disclosure of JP 2018-56069 A can be used as a reference for foldable organic EL display devices, excluding polarizers. Because a cover glass cannot be used, a surface film is required. For example, paragraphs

[0030] to

[0040] describe that a polyimide resin is preferred as a substrate having flexibility that allows for bending preferably 200,000 times, more preferably 300,000 times, and even more preferably 500,000 times with a curvature radius of 3 mm or less (e.g., 3 mm, 2 mm, or 1 mm), and that an organic-inorganic hybrid material, such as a UV-curable acrylic resin blended with silica particles or a cage-shaped silsesquioxane compound, is preferred as a hard coat layer. In the surface protective layer of the present invention, a hard coat using a silsesquioxane compound having a structure described in JP-A No. 2015-212353, JP-A No. 2017-008148, or the like is preferred.

[0144] <Optical laminate> 1, the optical laminate of the present invention comprises an optical film 20 having an optically absorptive anisotropic film 18, and at least a λ / 4 plate 14. This combination makes it possible to effectively prevent reflection of external light.

[0145] [λ / 4 plate] The "λ / 4 plate" in the present invention is a plate having a λ / 4 function (λ / 4 wavelength plate), specifically, a plate having the function of converting linearly polarized light of a specific wavelength into circularly polarized light (or circularly polarized light into linearly polarized light). A specific example of a λ / 4 plate is disclosed in US Patent Application Publication No. 2015 / 0277006. For example, specific examples of a λ / 4 plate having a single layer structure include a stretched polymer film and a retardation film having an optically anisotropic layer having λ / 4 function provided on a support, and specific examples of a λ / 4 plate having a multilayer structure include a broadband λ / 4 plate formed by laminating a λ / 4 plate and a λ / 2 plate. It is more preferable that the retardation film provided with an optically anisotropic layer having λ / 4 function is a retardation film of one or more layers containing at least one liquid crystal compound (disk-shaped liquid crystal, rod-shaped liquid crystal compound, etc.) formed by polymerizing a liquid crystal monomer that exhibits a nematic liquid crystal layer or a smectic liquid crystal layer. Furthermore, it is more preferable to use a liquid crystal compound with reverse wavelength dispersion as a λ / 4 plate with excellent optical performance. Specifically, a liquid crystal compound of general formula (II) described in International Publication No. WO2017 / 043438 is preferably used. Regarding a method for producing a λ / 4 plate using a liquid crystal compound with reverse wavelength dispersion, reference can be made to Examples 1 to 10 of WO2017 / 043438 and Example 1 of JP2016-91022A.

[0146] [Other Retardation Layers] The optical laminate of the present invention may have a retardation layer other than the λ / 4 plate. Examples of other retardation layers include a C plate. There are two types of C plates: a positive C plate (positive C plate) and a negative C plate (negative C plate). The positive C plate satisfies the relationship of formula (C1), and the negative C plate satisfies the relationship of formula (C2). The positive C plate exhibits a negative Rth value, while the negative C plate exhibits a positive Rth value. Formula (C1) nz>nx≒ny Formula (C2) nz <nx≒ny The above "≒" includes not only the case where the two are completely identical, but also the case where the two are substantially identical. For example, "substantially the same" also includes the case where (nx-ny)×d (where d is the thickness of the film) is 0 to 10 nm, preferably 0 to 5 nm, in "nx≒ny."

[0147] [Adhesive layer] The optical laminate of the present invention may have an adhesive layer between the optical film and the λ / 4 plate.

[0148] Examples of adhesives contained in the adhesive layer include rubber-based adhesives, acrylic-based adhesives, silicone-based adhesives, urethane-based adhesives, vinyl alkyl ether-based adhesives, polyvinyl alcohol-based adhesives, polyvinylpyrrolidone-based adhesives, polyacrylamide-based adhesives, and cellulose-based adhesives. Among these, acrylic adhesives (pressure-sensitive adhesives) are preferred from the viewpoints of transparency, weather resistance, heat resistance, and the like.

[0149] The adhesive layer can be formed, for example, by a method in which a solution of an adhesive is applied to a release sheet, dried, and then transferred to the surface of a transparent resin layer; or a method in which a solution of an adhesive is applied directly to the surface of a transparent resin layer and dried; or the like. The adhesive solution is prepared as a solution of about 10 to 40 mass % by dissolving or dispersing the adhesive in a solvent such as toluene or ethyl acetate. Examples of the coating method include roll coating methods such as reverse coating and gravure coating, spin coating, screen coating, fountain coating, dipping, and spraying.

[0150] Examples of materials constituting the release sheet include suitable thin sheets such as synthetic resin films such as polyethylene, polypropylene, and polyethylene terephthalate; rubber sheets; paper; cloth; nonwoven fabrics; nets; foam sheets; and metal foils.

[0151] In the present invention, the thickness of the optional adhesive layer is not particularly limited, but is preferably 3 to 50 μm, more preferably 4 to 40 μm, and even more preferably 5 to 30 μm.

[0152] In the display device 10 of the present invention, the thickness of the optical film 20 is not limited and may be appropriately set depending on the configuration of the optical film, the material from which the optical film is formed, etc. The thickness of the optical film 20 is preferably 1 to 100 μm, more preferably 1 to 30 μm, and even more preferably 1 to 10 μm.

[0153] In the display device 10 of the present invention, the sum of the thickness of the λ / 4 plate 14 and the thickness of the optical film 20 is preferably 20 μm or less. By making the total thickness of the λ / 4 plate 14 and the optical film 20 20 μm or less, the EL substrate 12 and the optically absorbing anisotropic film 18 are brought closer together, the angle of view from the light-emitting element to region A is increased, and the utilization efficiency of the light emitted by the light-emitting element can be improved.

[0154] The thickness of the optical film can be measured using an existing contact film thickness meter. Alternatively, the cross section of the optical film can be observed with a microscope or scanning electron microscope (SEM) and measured directly. When determining the film thickness from cross-sectional observation, for example, the cross section can be cut in the film thickness direction using a Leica rotary microtome RM2265 and observed using a Nikon polarizing microscope LV100-POL.

[0155] The optical film 20 in the illustrated example has a configuration in which the optically absorptive anisotropic film 18 is formed on the surface of the support 16, but the present invention is not limited to this. As an example, the optical film 20 may not have a support 16, and the optically absorptive anisotropic film 18 or the like may be formed directly on the λ / 4 plate 14. That is, the display device of the present invention may have a configuration in which the optical film 20 is formed only from the optically absorptive anisotropic film 18. Alternatively, an alignment film may be formed on the λ / 4 plate 14, and the optically absorptive anisotropic film 18 may be formed on the surface of the alignment film. With such a configuration, the total thickness of the λ / 4 plate 14 and the optical film 20 can be suitably set to 20 μm or less.

[0156] <Image display device> A conceptual diagram of an example of an image display device of the present invention is shown in Figure 1. In the following description, the image display device of the present invention will also be simply referred to as a display device. The display device 10 shown in FIG. 1 is a self-luminous display device that uses inorganic EL light-emitting elements or the like as described above, and includes an EL substrate 12, a λ / 4 plate 14, and an optical film 20. The optical film 20 includes a support 16 and an optically absorptive anisotropic film 18. The optically absorptive anisotropic film 18 has, within the same film plane, two regions, Region A and Region B, whose absorption axes have different inclinations relative to the film plane. That is, in the optically absorptive anisotropic film 18, Region 18A corresponds to Region A in the present invention, and Region 18B corresponds to Region B in the present invention.

[0157] [EL substrate] The EL substrate 12 is a known EL substrate having an EL light-emitting element, and is used in inorganic EL display devices, organic EL display devices, and the like. The display device 10 shown in the figure is capable of displaying full-color images, and the EL substrate 12 has an R light-emitting element 12R that emits red light, a G light-emitting element 12G that emits green light, and a B light-emitting element 12B that emits blue light. In the following description, when there is no need to distinguish between the R light-emitting element 12R, the G light-emitting element 12G, and the B light-emitting element 12B, the R light-emitting element 12R, the G light-emitting element 12G, and the B light-emitting element 12B are also collectively referred to as "light-emitting elements." The EL substrate 12, like known EL substrates, has a large number of such R light-emitting elements 12R, G light-emitting elements 12G, and B light-emitting elements 12B arranged two-dimensionally.

[0158] In the present invention, the EL substrate 12 can be any of various known EL substrates used in self-luminous display devices that use inorganic EL light-emitting elements, organic EL light-emitting elements, and the like. Therefore, the EL substrate 12 may be an EL substrate 12a conceptually shown in FIG. 4, in which R light-emitting elements 12R, G light-emitting elements 12G, and B light-emitting elements 12B made of organic EL (OLED (Organic Light Emitting Diode)) are arranged. The EL substrate 12 may also be an EL substrate 12b conceptually shown in Fig. 5, in which an R light-emitting element 12R, a G light-emitting element 12G, and a B light-emitting element 12B using inorganic EL are arranged. The inorganic EL is a so-called LED (Light Emitting Diode). Furthermore, the EL substrate 12 may be an EL substrate having a two-dimensional arrangement of light-emitting sections 24 each having an R light-emitting element 12R, a G light-emitting element 12G, and a B light-emitting element 12B, which are minute inorganic EL light-emitting elements, as in the EL substrate 12c conceptually shown in FIG. 6.

[0159] In the display device 10 of the present invention, there is no limitation on the area ratio of the light-emitting elements on the EL substrate 12. The area ratio of the light-emitting elements on the EL substrate 12 is preferably 30% or less, more preferably 10% or less, even more preferably 3% or less, and even more preferably 1% or less. As will be described later, in the display device 10 of the present invention, it is preferable that the position of the region 18A in the optically absorptive anisotropic film 18 corresponds to the position of the light-emitting element on the EL substrate 12. Therefore, by setting the area ratio of the light-emitting elements on the EL substrate 12 to 30% or less, the area of ​​the region B that contributes to preventing reflection of external light can be increased, more preferably ensuring sufficient utilization efficiency of the light emitted by the light-emitting elements and improving the effect of preventing reflection of external light.

[0160] When viewed from a typical viewing distance appropriate for the display device, the reflection of external light in the display device 10 of the present invention is determined by the reflectance of external light at each position on the screen and its area ratio. In other words, the screen resolution of the display device 10 does not contribute to suppressing reflection of external light. On the other hand, a higher screen resolution of the display device 10 is preferable from the viewpoint of providing a display device with excellent display quality.

[0161] In order to reduce the area ratio of the light-emitting elements in the display device 10, it is necessary to increase the output of the light-emitting elements to obtain sufficient brightness. In this respect, the light-emitting elements on the EL substrate 12 are preferably inorganic EL light-emitting elements (so-called LEDs). By using inorganic EL light-emitting elements, sufficient brightness can be obtained even if the area ratio of the light-emitting elements is set to a preferred range of 30% or less, more preferably 10% or less, even more preferably 3% or less, and even more preferably 1% or less.

[0162] In order to obtain a display device 10 that achieves high resolution and sufficient brightness while reducing the area ratio of the light-emitting elements, it is preferable to use fine inorganic EL light-emitting elements. As the fine inorganic EL light-emitting element, an inorganic EL light-emitting element in which the diameter of a circle inscribed in the inorganic EL light-emitting element is 360 μm or less is preferable, an inorganic EL light-emitting element in which the diameter is 200 μm or less is more preferable, an inorganic EL light-emitting element in which the diameter is 100 μm or less is even more preferable, and an inorganic EL light-emitting element in which the diameter is 50 μm or less is even more preferable.

[0163] In one embodiment, the EL substrate 12 may be a transparent substrate. Preferably, the EL substrate 12 may be a transparent substrate on which inorganic EL light-emitting elements are arranged. By using a transparent substrate, a display device with a high design quality can be realized, which allows the background of the display device to be seen through and suppresses reflection of external light on the substrate surface.

[0164] In the illustrated display device 10, the EL substrate 12 has R light-emitting elements 12R, G light-emitting elements 12G, and B light-emitting elements 12B, and is capable of displaying full-color images, but the present invention is not limited to this. For example, the organic EL substrate may be one that has only R light-emitting elements 12R, or only G light-emitting elements 12G, or only B light-emitting elements 12B and is compatible with the display of monochrome images (single-color images). Alternatively, the organic EL substrate may be one that has R light-emitting elements 12R and G light-emitting elements 12G, or R light-emitting elements 12R and B light-emitting elements 12B, or G light-emitting elements 12G and B light-emitting elements 12B and is compatible with the display of two-color images.

[0165] In the display device of the present invention, a commercially available self-luminous display device (display) using an inorganic EL light-emitting element, an organic EL light-emitting element, or the like may be used as the EL substrate 12, as long as it does not have a circular polarizing plate having an optical film (polarizer) and a λ / 4 plate as an antireflection layer. In addition, the commercially available display device may have a touch panel or the like.

[0166] From the viewpoint of achieving excellent effects of the present invention, it is preferable that the position of region 18A of optically absorptive anisotropic film 18 used in the present invention corresponds to the position of the light-emitting element of EL substrate 12. "Corresponding in position" means that when display device 10 in which the position of region A of the optically absorptive anisotropic film corresponds to the position of the light-emitting element of the image display device is viewed from the normal direction to the display surface, region 18A of optically absorptive anisotropic film 18 and the light-emitting element of EL substrate 12 at least partially overlap, and preferably means that region 18A of optically absorptive anisotropic film 18 encompasses the light-emitting element of EL substrate 12. Furthermore, it is preferable that the centers (optical axes of the light-emitting elements) of the region 18A of the optically absorptive anisotropic film 18 and the light-emitting elements of the EL substrate 12 coincide with each other when the display device 10 is viewed from the normal direction to the display surface. Furthermore, it is particularly preferable that the centers of the region 18A of the optically absorptive anisotropic film 18 coincide with the centers of the light-emitting elements of the EL substrate 12, and that the region 18A of the optically absorptive anisotropic film 18 encompass the light-emitting elements of the EL substrate 12. 6, in the case of an EL substrate formed by arranging light-emitting sections 24 each having an R light-emitting element 12R, a G light-emitting element 12G, and a B light-emitting element 12B, the center of the light-emitting element refers to the center of a circle inscribed with the three light-emitting elements (plurality of light-emitting elements) that make up the light-emitting section 24. This also applies to the following description, for example, regarding the pitch of the light-emitting elements.

[0167] 7, the region 18A of the optically absorptive anisotropic film 18 is square, but the present invention is not limited to this. That is, the shape of the region 18A in a plan view of the display device 10 can be various shapes depending on the emission characteristics of the light-emitting elements, the arrangement of the light-emitting elements, etc. The emission characteristics of the light-emitting elements include, for example, the spread angle of the emitted light. For example, as conceptually shown in a plan view in Fig. 8, region 18A of optically absorptive anisotropic film 18 may be circular. Alternatively, region 18A may be elliptical, triangular, or polygonal with pentagons or more sides. In any shape, the center of the region A may be the center of a circle inscribed in the region A.

[0168] 7, there are no limitations on the sizes of region 18A and region 18B of optically absorptive anisotropic film 18, but it is preferable that 18A be on the same order as the light-emitting element. That is, in line with the size of the light-emitting element described above, the diameter of the inscribed circle of region A is preferably 360 μm or less, more preferably 200 μm or less, even more preferably 100 μm or less, and particularly preferably 50 μm or less.

[0169] The proportion of the region A in the entire region of the optically absorptive anisotropic film 18 is preferably 1 to 50%, more preferably 5 to 30%. The proportion of region B in the entire region of the optically absorptive anisotropic film 18 is preferably 50 to 99%, more preferably 70 to 95%.

[0170] <Pattern formation method> As described above, in the display device 10 of the present invention, the optically absorptive anisotropic film 18 is formed in a pattern within the same film surface, with regions 18A and 18B having different inclinations of the absorption axis relative to the film surface.

[0171] There is no limitation on the method for forming the optically absorptive anisotropic film 18 having two or more regions with different inclinations of the absorption axis in the plane, and various known methods can be used. Examples include a method of controlling the thickness of the optically absorptive anisotropic film 18 in the plane, a method of orienting a dichroic dye compound in the optically absorptive anisotropic film 18 using magnetic force, and a method of controlling the thickness using a photo-alignment film adjacent to the optically absorptive anisotropic film 18. Methods for controlling the thickness of the optically absorptive anisotropic film 18 in-plane include a method using imprinting and a method for forming an optically absorptive anisotropic film on a substrate with a textured structure. A method for orienting the dichroic dye compound in the optically absorptive anisotropic film 18 using magnetic force includes a method for orienting the liquid crystal compound in a desired direction by applying a magnetic field. Furthermore, a method for controlling the thickness using an alignment film adjacent to the optically absorptive anisotropic film 18 includes a method using lithography. Among these, in order to form a pattern of several tens of micrometers to several millimeters that matches the arrangement of the light-emitting elements on the EL substrate 12, a method of control using an alignment film adjacent to the optically absorbing anisotropic film 18 is preferred, and in particular, a method using lithography is preferably used.

[0172] <Formation of optically absorbing anisotropic film using lithography> FIG. 9 shows an example of a method for forming the optically absorptive anisotropic film 18 using lithography. When forming the optically absorptive anisotropic film 18 using lithography, first, the aforementioned coating film 26 of the photo-alignment film is formed on the surface of the support 16. Next, the resulting coating film C is subjected to a first light irradiation. As the first light irradiation, linearly polarized light is irradiated onto the coating film 26 from the top or back surface, in a direction perpendicular to the film surface, to obtain a photo-alignment film having an alignment control force in the horizontal direction (first diagram in FIG. 9). Next, the obtained photo-alignment film is subjected to a second light irradiation. As the second light irradiation, unpolarized light is irradiated onto the surface of the photo-alignment film from any direction. Here, as shown in the second diagram of FIG. 9, this light irradiation is performed by pattern exposure through a mask 28 having a pattern of light-transmitting portions 28a and light-shielding portions 28b, thereby obtaining a pattern-exposed photo-alignment film. Note that the light-transmitting portions 28a and light-shielding portions 28b of this mask 28 are provided in a pattern such that the light-transmitting portions 28a correspond to region 18A of the optically absorptive anisotropic film 18, and the light-shielding portions 28b correspond to region 18B of the optically absorptive anisotropic film 18. Next, as described above, a coating film 18 of a liquid crystal composition is formed on the obtained pattern-exposed photo-alignment film by the coating film formation step (FIG. 9, third diagram). Next, the liquid crystal composition in the coating film 18 is aligned by the alignment step to form an optically absorptive anisotropic film 18 having regions 18A and 18B with different inclinations of the absorption axis relative to the film surface (FIG. 9, fourth diagram).

[0173] In this example, the first and second light irradiations are shown for the photo-alignment film corresponding to the two regions 18A and 18B, but in the present invention, it is also possible to perform multiple irradiations to obtain an optically absorbing anisotropic film having three or more different absorption axes. The amount of irradiation for each light irradiation may be set appropriately depending on the material forming the optically absorptive anisotropic film 18 so that the absorption axes of the regions 18A and 18B reach the target values. This also applies to the other examples. [Example]

[0174] The present invention will be specifically described below based on examples. The materials, reagents, amounts and proportions of substances, procedures, etc. shown in the following examples can be appropriately changed without departing from the spirit of the present invention. Therefore, the present invention is not limited to or by the following examples.

[0175] [Example 1] <<Optical film production>> <Preparation of support> A polymer coating solution having the following composition was continuously applied to a 40 μm thick TAC substrate (TG40, manufactured by Fujifilm Corporation) using a #8 wire bar. The coating was then dried with hot air at 100°C for 2 minutes to obtain a support having a 0.8 μm thick polyvinyl alcohol (PVA) polymer film formed on the TAC substrate. The modified polyvinyl alcohol was added to the polymer coating solution so that the solid content concentration was 4% by mass. ---------------------------------------------------------------------------------- Polymer coating composition ---------------------------------------------------------------------------------- The following modified polyvinyl alcohols: ·Water 70 parts by mass Methanol 30 parts by weight ----------------------------------------------------------------------------------

[0176] Modified Polyvinyl Alcohol

[0177] [ka]

[0178] <Formation of alignment film> To 1 part by mass of the photo-alignment material E-1 having the following structure, 41.6 parts by mass of butoxyethanol, 41.6 parts by mass of dipropylene glycol monomethyl, and 15.8 parts by mass of pure water were added, and the resulting solution was pressure-filtered through a 0.45 μm membrane filter to prepare a coating solution for a photo-alignment film. Next, the obtained coating liquid for a photo-alignment film was applied onto the prepared support and dried at 60° C. for 1 minute. Thereafter, the obtained coating film was irradiated with linearly polarized ultraviolet light (illuminance 4.5 mW / cm ) using a polarized ultraviolet light exposure device. 2 , cumulative irradiation dose 300mJ / cm 2 ) (first light irradiation) to produce a photo-alignment film having a horizontal alignment control force. The thickness of the photo-alignment film was 50 nm. Next, the obtained photo-alignment film was irradiated with unpolarized ultraviolet light (illuminance 4.5 mW / cm) through a photomask in the direction perpendicular to the film surface. 2 , cumulative irradiation dose 2000mJ / cm 2 ) (second light irradiation) to prepare a pattern-exposed photo-alignment film. The mask pattern of the mask had a light-shielding portion corresponding to the position of the light-emitting element (area ratio 25%) of the EL substrate 1 described later, and had a light-transmitting portion and a light-shielding portion.

[0179] [ka]

[0180] <Preparation of optically anisotropic absorption film> Onto the obtained pattern-exposed photoalignment film, a composition F1 for forming an optically absorptive anisotropic film having the following composition was continuously coated with a wire bar to form a coating layer F. Next, the coating layer F was heated at 140° C. for 15 seconds, and then cooled to room temperature (23° C.). It was then heated at 75°C for 60 seconds and cooled again to room temperature. Then, an LED lamp (center wavelength 365 nm) was used to illuminate the specimen at an intensity of 200 mW / cm 2By irradiating the pattern-exposed alignment film for 2 seconds under the irradiation conditions, an optically absorbing anisotropic film having regions A and B with different inclinations of the absorption axis relative to the film surface was produced. When the absorption axes of regions A and B were measured using the method described above, the absorption axis angle θA of region A was 78°, and the absorption axis angle θB of region B was 0°. Furthermore, the transmittance in the absorption axis direction of region A was 64%, and the in-plane orientation degree of region B was 0.962. The film thickness of the optically absorbing anisotropic film was 2.0 μm. The proportion of region A to the entire region of the optically absorptive anisotropic film was 25%, and the proportion of region B was 75%.

[0181] ---------------------------------------------------------------------------------- Composition of optically absorptive anisotropic film-forming composition F1 ---------------------------------------------------------------------------------- 0.65 parts by mass of the following first dichroic substance C-1 0.15 parts by mass of the following second dichroic substance M-1 0.52 parts by mass of the following third dichroic substance Y-1 2.68 parts by mass of the following liquid crystal compound L-1 1.15 parts by mass of the following liquid crystal compound L-2 Polymerization initiator IRGACUREOXE-02 (BASF) 0.17 parts by mass 0.020 parts by mass of the following surfactant S-1 Cyclopentanone 92.14 parts by mass Benzyl alcohol 2.36 parts by mass ----------------------------------------------------------------------------------

[0182] Dichroic substance C-1 (maximum absorption wavelength: 570 nm)

[0183] [ka]

[0184] Dichroic substance M-1 (maximum absorption wavelength: 466 nm)

[0185] [ka]

[0186] Dichroic substance Y-1 (maximum absorption wavelength: 417 nm)

[0187] [ka]

[0188] Liquid crystal compound L-1

[0189] [ka]

[0190] Liquid crystal compound L-2 (in the formula below, the numbers represent mass ratios)

[0191] [ka]

[0192] Surfactant S-1

[0193] [ka]

[0194] <Creating the oxygen blocking layer> Coating Solution B1 having the following composition was continuously applied to the obtained optically absorptive anisotropic film using a wire bar. Then, it was dried with hot air at 80°C for 5 minutes to obtain an optical film having a 1.0 μm-thick oxygen-blocking layer made of polyvinyl alcohol (PVA), i.e., Optical Film 1 having a TAC substrate (transparent support), a photo-alignment film, an optically absorptive anisotropic film, and an oxygen-blocking layer arranged adjacently in this order. ---------------------------------------------------------------------------------- Composition of coating solution B1 for forming oxygen barrier layer ---------------------------------------------------------------------------------- 3.80 parts by mass of the above-mentioned modified polyvinyl alcohol Initiator Irg2959 0.20 parts by mass ·Water 70 parts by mass Methanol 30 parts by weight ----------------------------------------------------------------------------------

[0195] [Examples 2 to 10, Comparative Examples 1 to 4] Optical films 2 to 9 described in Examples and optical films 10 to 14 described in Comparative Examples, each having an optically absorptive anisotropic film, were obtained in the same manner as in Example 1, except that the conditions for the second light irradiation during alignment film formation and the composition for forming an optically absorptive anisotropic film were changed to the liquids shown in Table 1. The absorption axis angles θA and θB, the transmittance, and the degree of orientation in each Example were as shown in Table 1.

[0196] ---------------------------------------------------------------------------------- Composition of optically absorptive anisotropic film-forming composition F2 ---------------------------------------------------------------------------------- 0.65 parts by mass of the first dichroic material C-1 0.15 parts by mass of the second dichroic substance M-1 0.52 parts by mass of the third dichroic material Y-1 2.68 parts by mass of the liquid crystal compound L-1 1.15 parts by mass of the liquid crystal compound L-2 Polymerization initiator IRGACUREOXE-02 (BASF) 0.17 parts by mass 0.018 parts by mass of the above surfactant S-1 0.002 parts by mass of the following surfactant S-2 Cyclopentanone 92.14 parts by mass Benzyl alcohol 2.36 parts by mass ----------------------------------------------------------------------------------

[0197] Surfactant S-2

[0198] [ka]

[0199] ---------------------------------------------------------------------------------- Composition of optically absorptive anisotropic film-forming composition F3 ---------------------------------------------------------------------------------- 0.65 parts by mass of the first dichroic material C-1 0.15 parts by mass of the second dichroic substance M-1 0.52 parts by mass of the third dichroic material Y-1 2.68 parts by mass of the liquid crystal compound L-1 1.15 parts by mass of the liquid crystal compound L-2 Polymerization initiator IRGACUREOXE-02 (BASF) 0.17 parts by mass 0.015 parts by mass of the above surfactant S-1 0.005 parts by mass of the above surfactant S-2 Cyclopentanone 92.14 parts by mass Benzyl alcohol 2.36 parts by mass ----------------------------------------------------------------------------------

[0200] ---------------------------------------------------------------------------------- Composition of optically absorptive anisotropic film-forming composition F4 ---------------------------------------------------------------------------------- 0.65 parts by mass of the first dichroic material C-1 0.15 parts by mass of the second dichroic substance M-1 0.52 parts by mass of the third dichroic material Y-1 2.68 parts by mass of the liquid crystal compound L-1 1.15 parts by mass of the liquid crystal compound L-2 Polymerization initiator IRGACUREOXE-02 (BASF) 0.17 parts by mass 0.012 parts by mass of the above surfactant S-1 0.008 parts by mass of the above surfactant S-2 Cyclopentanone 92.14 parts by mass Benzyl alcohol 2.36 parts by mass ----------------------------------------------------------------------------------

[0201] ---------------------------------------------------------------------------------- Composition of optically absorptive anisotropic film-forming composition F5 ---------------------------------------------------------------------------------- 0.65 parts by mass of the first dichroic material C-1 0.15 parts by mass of the second dichroic substance M-1 0.52 parts by mass of the third dichroic material Y-1 2.68 parts by mass of the liquid crystal compound L-1 1.15 parts by mass of the liquid crystal compound L-2 Polymerization initiator IRGACUREOXE-02 (BASF) 0.17 parts by mass 0.008 parts by mass of the above surfactant S-1 0.012 parts by mass of the above surfactant S-2 Cyclopentanone 92.14 parts by mass Benzyl alcohol 2.36 parts by mass ----------------------------------------------------------------------------------

[0202] ---------------------------------------------------------------------------------- Composition of optically absorptive anisotropic film-forming composition F6 ---------------------------------------------------------------------------------- 0.65 parts by mass of the first dichroic material C-1 0.15 parts by mass of the second dichroic substance M-1 0.52 parts by mass of the third dichroic material Y-1 2.68 parts by mass of the liquid crystal compound L-1 1.15 parts by mass of the liquid crystal compound L-2 Polymerization initiator IRGACUREOXE-02 (BASF) 0.17 parts by mass 0.020 parts by mass of the above surfactant S-2 Cyclopentanone 92.14 parts by mass Benzyl alcohol 2.36 parts by mass ----------------------------------------------------------------------------------

[0203] ---------------------------------------------------------------------------------- Composition of optically absorptive anisotropic film-forming composition F7 ---------------------------------------------------------------------------------- 0.8 parts by mass of the following dichroic substance D1 ·2.6 parts by mass of the following dichroic substance D2 2.2 parts by mass of the following dichroic substance D3 ·1.8 parts by mass of the following dichroic substance D4 100.0 parts by mass of the following liquid crystal compound M1 Polymerization initiator IRGACURE369 (BASF) 5.0 parts by mass BYK361N (manufactured by BYK Japan) 0.9 parts by mass Cyclopentanone 925.0 parts by mass ----------------------------------------------------------------------------------

[0204] Dichroic substance D1

[0205] [ka]

[0206] Dichroic substance D2

[0207] [ka]

[0208] Dichroic substance D3

[0209] [ka]

[0210] Dichroic substance D4

[0211] [ka]

[0212] Liquid crystal compound M1 (compound A / compound B mixed at 75 / 25) (Compound A)

[0213] [ka]

[0214] (Compound B)

[0215] [ka]

[0216] ---------------------------------------------------------------------------------- Composition of optically absorptive anisotropic film-forming composition F8 ---------------------------------------------------------------------------------- 0.325 parts by mass of the first dichroic material C-1 0.15 parts by mass of the second dichroic substance M-1 0.52 parts by mass of the third dichroic material Y-1 0.325 parts by mass of the following fourth dichroic substance C-2 2.68 parts by mass of the liquid crystal compound L-1 1.15 parts by mass of the liquid crystal compound L-2 Polymerization initiator IRGACUREOXE-02 (BASF) 0.17 parts by mass 0.012 parts by mass of the above surfactant S-1 0.008 parts by mass of the above surfactant S-2 Cyclopentanone 92.14 parts by mass Benzyl alcohol 2.36 parts by mass ----------------------------------------------------------------------------------

[0217] Dichroic substance C-2 (maximum absorption wavelength: 570 nm)

[0218] [ka]

[0219] ---------------------------------------------------------------------------------- Composition of optically absorptive anisotropic film-forming composition F9 ---------------------------------------------------------------------------------- 0.65 parts by mass of the first dichroic material C-1 0.15 parts by mass of the second dichroic substance M-1 0.52 parts by mass of the third dichroic material Y-1 2.68 parts by mass of the liquid crystal compound L-1 1.15 parts by mass of the liquid crystal compound L-2 Polymerization initiator IRGACUREOXE-02 (BASF) 0.17 parts by mass 0.050 parts by mass of the above surfactant S-2 Cyclopentanone 92.14 parts by mass Benzyl alcohol 2.36 parts by mass ----------------------------------------------------------------------------------

[0220] <<Production of optical laminates>> <Fabrication of λ / 4 plate> [Preparation of transparent support] (Preparation of cellulose acylate dope for core layer) The following composition was charged into a mixing tank and stirred to dissolve each component, thereby preparing a cellulose acetate solution to be used as a cellulose acylate dope for the core layer. ---------------------------------------------------------------------------------- Core layer: cellulose acylate dope ---------------------------------------------------------------------------------- 100 parts by mass of cellulose acetate with an acetyl substitution degree of 2.88 In the example of JP 2015-227955 A 12 parts by weight of the described polyester compound B 2 parts by mass of the following compound F Methylene chloride (first solvent) 430 parts by mass Methanol (second solvent) 64 parts by weight ----------------------------------------------------------------------------------

[0221] Compound F

[0222] [ka]

[0223] (Preparation of outer layer cellulose acylate dope) To 90 parts by weight of the above-mentioned cellulose acylate dope for the core layer, 10 parts by weight of the following matting agent solution was added to prepare a cellulose acetate solution to be used as the cellulose acylate dope for the outer layer.

[0224] ---------------------------------------------------------------------------------- Matting agent solution ---------------------------------------------------------------------------------- Silica particles with an average particle size of 20 nm (AEROSIL R972, manufactured by Nippon Aerosil Co., Ltd.) 2 parts by mass Methylene chloride (first solvent) 76 parts by mass Methanol (second solvent) 11 parts by mass 1 part by mass of the above-mentioned cellulose acylate dope for the core layer ----------------------------------------------------------------------------------

[0225] (Preparation of Cellulose Acylate Film 1) The core layer cellulose acylate dope and the outer layer cellulose acylate dope were filtered through a filter paper with an average pore size of 34 μm and a sintered metal filter with an average pore size of 10 μm, and then the core layer cellulose acylate dope and the outer layer cellulose acylate dope on both sides were simultaneously cast onto a drum at 20°C from a casting nozzle (band casting machine). Next, the film was peeled off when the solvent content was about 20% by mass, and both ends in the width direction of the film were fixed with tenter clips, and the film was dried while being stretched in the transverse direction at a stretch ratio of 1.1. Thereafter, the film was further dried by transporting it between rolls of a heat treatment device to prepare an optical film (transparent support) having a thickness of 40 μm, which was designated as cellulose acylate film 1. The in-plane retardation of the obtained cellulose acylate film 1 was 0 nm.

[0226] [Preparation of TAC film A1 with positive A plate A1] The coating solution PA1 for forming a photo-alignment film having the following composition was continuously coated on the above-mentioned cellulose acylate film 1 using a wire bar. The support on which the coating film was formed was dried with hot air at 140°C for 120 seconds, and then the coating film was irradiated with polarized ultraviolet light (10 mJ / cm 2 By using an ultra-high pressure mercury lamp, a photo-alignment film PA1 having a thickness of 0.2 μm was formed, and a TAC film with a photo-alignment film was obtained.

[0227] ---------------------------------------------------------------------------------- Coating liquid PA1 for photo alignment film formation ---------------------------------------------------------------------------------- 100.00 parts by mass of the following polymer PA-2 5.00 parts by weight of the acid generator PAG-1 (listed below) Acid generator CPI-110TF (manufactured by San-Apro Co., Ltd.) 0.005 parts by mass Isopropyl alcohol 16.50 parts by weight Butyl acetate 1072.00 parts by mass Methyl ethyl ketone 268.00 parts by mass ----------------------------------------------------------------------------------

[0228] Acid generator PAG-1

[0229] [ka]

[0230] Polymer PA-1

[0231] [ka]

[0232] Composition A-1 having the following composition was applied onto the photo-alignment film PA1 using a bar coater. The coating film formed on the photo-alignment film PA1 was heated to 120°C with hot air, then cooled to 60°C, and then irradiated with 100 mJ / cm2 at a wavelength of 365 nm using a high-pressure mercury lamp under a nitrogen atmosphere. 2 The coating was irradiated with ultraviolet light of 500 mJ / cm 2 and then heated to 120°C. 2 The coating film was irradiated with ultraviolet light of 1000 kJ / cm 2 , thereby fixing the alignment of the liquid crystal compound, and a TAC film A1 having a positive A plate A1 was produced. The thickness of the positive A plate A1 was 2.5 μm, and the obtained positive A plate A1 corresponded to a λ / 4 plate, with an Re(550) of 144 nm. The positive A plate A1 also satisfied the relationship Re(450)≦Re(550)≦Re(650). The Re(450) / Re(550) ratio was 0.82.

[0233] ---------------------------------------------------------------------------------- Composition A-1 ---------------------------------------------------------------------------------- 43.50 parts by mass of the following polymerizable liquid crystal compound LA-1 43.50 parts by mass of the following polymerizable liquid crystal compound LA-2 8.00 parts by mass of the following polymerizable liquid crystal compound LA-3 5.00 parts by mass of the following polymerizable liquid crystal compound LA-4 0.55 parts by mass of the following polymerization initiator PI-1 0.20 parts by weight of the following leveling agent T-1 Cyclopentanone 235.00 parts by mass ----------------------------------------------------------------------------------

[0234] Polymerizable liquid crystal compound LA-1 (tBu represents a tertiary butyl group)

[0235] [ka]

[0236] Polymerizable liquid crystal compound LA-2

[0237] [ka]

[0238] Polymerizable liquid crystal compound LA-3

[0239] [ka]

[0240] Polymerizable liquid crystal compound LA-4 (Me represents a methyl group)

[0241] [ka]

[0242] Polymerization initiator PI-1

[0243] [ka]

[0244] Leveling Agent T-1

[0245] [ka]

[0246] [Preparation of TAC film C1 with positive C-plate C1] The above-mentioned cellulose acylate film 1 was used as the temporary support. The cellulose acylate film 1 was passed through a dielectric heating roll at a temperature of 60°C to raise the film surface temperature to 40°C, and then an alkaline solution having the composition shown below was applied to one side of the film using a bar coater in an amount of 14 ml / m 2 The mixture was heated to 110°C and transported under a steam-type far-infrared heater manufactured by Noritake Co., Ltd. for 10 seconds. Next, using the same bar coater, 3 ml / m of pure water was applied to the film. 2 It was applied. Next, after repeating washing with a fountain coater and draining with an air knife three times, the film was transported to a drying zone at 70° C. for 10 seconds and dried to prepare an alkaline saponified cellulose acylate film 1.

[0247] ---------------------------------------------------------------------------------- (alkaline solution) ---------------------------------------------------------------------------------- Potassium hydroxide 4.7 parts by mass ·Water 15.8 parts by mass Isopropanol 63.7 parts by mass Fluorine-containing surfactant SF-1 (C 14 H 29 O(CH2CH2O) 20 H) 1.0 parts by mass Propylene glycol 14.8 parts by mass ----------------------------------------------------------------------------------

[0248] An alignment film-forming coating solution PA2 having the following composition was continuously applied using a #8 wire bar onto the above-mentioned alkali-saponified cellulose acylate film 1. The obtained film was dried with hot air at 60°C for 60 seconds and then with hot air at 100°C for 120 seconds to form an alignment film PA2.

[0249] ---------------------------------------------------------------------------------- Alignment film forming coating solution PA2 ---------------------------------------------------------------------------------- Polyvinyl alcohol (Kuraray, PVA103) 2.4 parts by weight Isopropyl alcohol 1.6 parts by weight Methanol 36 parts by weight ·Water 60 parts by mass ----------------------------------------------------------------------------------

[0250] A coating solution C1 for forming a positive C plate having the following composition was applied onto the alignment film PA2, and the resulting coating film was aged at 60°C for 60 seconds, and then irradiated with 70 mW / cm 2 in air. 2 An air-cooled metal halide lamp (manufactured by Eye Graphics Co., Ltd.) was used, and the output was 1000 mJ / cm2 The alignment state was fixed by irradiating the liquid crystal compound with ultraviolet light of 1000 nm to vertically align the liquid crystal compound, thereby producing a TAC film C1 having a positive C plate C1 with a thickness of 0.5 μm. The Rth(550) of the obtained positive C plate was −60 nm.

[0251] ---------------------------------------------------------------------------------- Positive C-plate coating solution C1 ---------------------------------------------------------------------------------- 80 parts by weight of the following liquid crystal compound LC-1 20 parts by weight of the following liquid crystal compound LC-2 1 part by weight of the following vertical alignment liquid crystal compound promoter S01 Ethylene oxide modified trimethylolpropane triacrylate (V#360, manufactured by Osaka Organic Chemical Co., Ltd.) 8 parts by mass Irgacure 907 (BASF) 3 parts by weight Kayacure DETX (manufactured by Nippon Kayaku Co., Ltd.) 1 part by weight 0.4 parts by mass of the following compound B03 Methyl ethyl ketone 170 parts by mass Cyclohexanone 30 parts by mass ----------------------------------------------------------------------------------

[0252] Liquid crystal compound LC-1

[0253] [ka]

[0254] Liquid crystal compound LC-2

[0255] [ka]

[0256] Vertical alignment liquid crystal compound promoter S01

[0257] [ka]

[0258] Compound B03

[0259] [ka]

[0260] [Preparation of adhesive N1] Next, an acrylate polymer was prepared according to the following procedure. In a reaction vessel equipped with a condenser, a nitrogen inlet pipe, a thermometer, and a stirrer, 95 parts by mass of butyl acrylate and 5 parts by mass of acrylic acid were polymerized by solution polymerization to obtain an acrylate polymer (A1) having an average molecular weight of 2,000,000 and a molecular weight distribution (Mw / Mn) of 3.0.

[0261] Next, the obtained acrylate polymer (A1) was used to prepare an acrylate adhesive with the following composition. These compositions were applied to a separate film surface-treated with a silicone release agent using a die coater, dried for 1 minute in a 90°C environment, and irradiated with ultraviolet (UV) light under the following conditions to obtain the following acrylate adhesive N1. The composition and film thickness of the acrylate adhesive are shown below. (UV irradiation conditions) Fusion electrodeless lamp H bulb ·Illuminance 600mW / cm 2 , light intensity 150mJ / cm 2 UV illuminance and light intensity were measured using the UVPF-36 manufactured by Eye Graphics.

[0262] ---------------------------------------------------------------------------------- Acrylate adhesive N1 (film thickness 15 μm) ---------------------------------------------------------------------------------- Acrylate polymer (A1) 100 parts by mass 11.1 parts by mass of the following (A) polyfunctional acrylate monomer 1.1 parts by mass of the following (B) photopolymerization initiator 1.0 parts by mass of the following (C) isocyanate-based crosslinking agent 0.2 parts by mass of the following silane coupling agent (D): ----------------------------------------------------------------------------------

[0263] (A) Multifunctional acrylate monomer: tris(acryloyloxyethyl) isocyanurate, molecular weight = 423, trifunctional type (manufactured by Toagosei Co., Ltd., product name "Aronix M-315") (B) Photopolymerization initiator: a 1:1 mixture of benzophenone and 1-hydroxycyclohexylphenyl ketone by mass, "Irgacure 500" manufactured by Ciba Specialty Chemicals (C) Isocyanate-based crosslinking agent: Trimethylolpropane-modified tolylene diisocyanate ("Coronate L" manufactured by Nippon Polyurethane Co., Ltd.) (D) Silane coupling agent: 3-glycidoxypropyltrimethoxysilane ("KBM-403" manufactured by Shin-Etsu Chemical Co., Ltd.)

[0264] [Preparation of UV adhesive] A UV adhesive composition having the following composition was prepared. ───────────────────────────────── UV adhesive composition ---------------------------------------------------------------------------------- CEL2021P (manufactured by Daicel) 70 parts by weight 1,4-butanediol diglycidyl ether 20 parts by mass 2-Ethylhexyl glycidyl ether 10 parts by mass ·CPI-100P 2.25 parts by mass ─────────────────────────────────

[0265] CPI-100P

[0266] [ka]

[0267] [Preparation of Optical Laminate 1] The retardation layer side of the TAC film A1 having the positive A plate A1 and the retardation layer side of the TAC film C1 having the positive C plate C1 are bonded to each other with the UV adhesive composition at 600 mJ / cm 2 The plates were laminated together by UV irradiation. The thickness of the UV adhesive layer was 2 μm. The surfaces to be laminated with the UV adhesive were each subjected to corona treatment. Next, the photo-alignment film PA1 and cellulose acylate film 1 on the positive A plate A1 side were removed to obtain a retardation plate 1. The layer configuration of the retardation plate 1 was the positive A plate A1, UV adhesive layer, positive C plate C1, photo-alignment film PA2, and cellulose acylate film 1.

[0268] The oxygen-blocking layer side of the optical film 1 was bonded to the support side of a low-reflection surface film CV-LC5 (manufactured by Fujifilm Corporation) using the pressure-sensitive adhesive N1. Next, the optical film 1 was left to stand in an environment of 25°C and 90% relative humidity for 24 hours, and the TAC substrate and photo-alignment film included in the optical film 1 were removed. The removed surface was then bonded to the positive A plate A1 side of the retardation plate 1 using the UV adhesive. The thickness of the UV adhesive layer was 4.45 μm. Next, the photo-alignment film PA2 and cellulose acylate film 1 on the positive C plate C1 side included in the retardation plate 1 were removed to prepare an optical laminate 1. At this time, the laminate was bonded so that the angle between the azimuth angle of the absorption axis of region B of the optically absorptive anisotropic film included in the laminate 1 and the slow axis of the positive A plate A1 was 45°. The layer structure of the optical laminate 1 was a low-reflection surface film CV-LC5, an adhesive layer N1, an oxygen-blocking layer, an optically absorbing anisotropic film, a UV adhesive layer, a positive A plate A1, a UV adhesive layer, and a positive C plate C1, and the total thickness of the optical film 1 (oxygen-blocking layer to optically absorbing anisotropic film) and the λ / 4 plate (positive A plate A1) was 10 μm.

[0269] [Preparation of Optical Laminates 2 to 14] Optical laminates 2 to 14 were produced in the same manner as for optical laminate 1, except that optical films 2 to 14 were used instead.

[0270] <<Evaluation>> The optical laminates produced in the examples and comparative examples were measured and evaluated, and the results are shown in Table 1 below.

[0271] <Light utilization efficiency> [Production Example 1] Three-color LEDs (PICOLED model SMLP34RGB, manufactured by ROHM Co., Ltd.) were arranged in a two-dimensional grid on a printed circuit board so that the LED (light-emitting element) area ratio was 30%. In the areas where no LEDs were placed, a black layer made of black matrix material for liquid crystal display devices was formed using photolithography. This produced EL substrate 1 (see Figure 6). An optical laminate 1 having an optical film 1 was placed on an EL substrate 1 with the positive C plate side facing the EL substrate 1, and they were bonded together via an adhesive N1 to produce an (EL) display device 1 of Production Example 1. During bonding, the region A of the optically absorptive anisotropic film included in the produced optical laminate was positioned so as to correspond to the light-emitting element of the EL substrate 1.

[0272] [Examples 2-14] Display devices 2 to 14 were produced in the same manner as in Production Example 1, except that the optical laminate 1 used was replaced with the optical laminates 2 to 14.

[0273] The luminance was measured using a spectroluminometer (SR3, manufactured by Topcon Technohouse) at a distance of 700 mm from the display surface of the produced display device, and the light utilization efficiency (light utilization efficiency) of the light emitting element was measured.

[0274] In order to measure the light utilization efficiency of the light emitting element, a display device 0 was produced using an optical laminate without an optically absorptive anisotropic film instead of the optical laminates of the examples and comparative examples. The light utilization efficiency of the light emitting elements of each display device in Preparation Examples 1 to 14 was measured using the luminance of each display device in the example and comparative example relative to the luminance of display device 0. The luminance for display device 0 is A is for 80% or more, B: 70% or more but less than 80% C: 60% or more but less than 70% If it is less than 60%, it is D. The evaluation results are shown in Table 1 below.

[0275] [Reflectance measurement] Using a spectrophotometer (CM2022, manufactured by Konica Minolta), the Y value in the SCI measurement method was measured 10 times at different positions on the surface, and the average value was used as the reflectance. The reflectivity is If it is less than 2%, it is A. B: 2% or more but less than 3% C if it is between 3% and 4% D if it is 4% or more, The evaluation results are shown in Table 1 below.

[0276] In Table 1, the column "Irradiation angle" indicates the angle of incidence of light when each light was irradiated onto the film surface. In Table 1, the "Transmittance" column indicates the transmittance in the absorption axis direction. In Table 1, the column "degree of orientation" indicates the degree of orientation in the in-plane direction of region B.

[0277] [Table 1]

[0278] As shown in Table 1, the display device of the present invention can be obtained by achieving both high light utilization efficiency of the light emitting element (light utilization efficiency) and an anti-reflection function for external light. Furthermore, as shown in Examples 1, 2, and 8, it was found that by setting the absorption axis angle θA of region A to 45 to 90°, it is possible to favorably achieve both utilization efficiency and anti-reflection function for external light, and by setting it to 80 to 90°, it is possible to even more favorably achieve both utilization efficiency and anti-reflection function for external light. Furthermore, a comparison between Examples 5 and 6 revealed that by setting the degree of orientation in the in-plane direction of Region B to 0.950 or more, both utilization efficiency and the function of preventing reflection of external light can be more suitably achieved.

[0279] Furthermore, as shown in FIG. 10, the optical film 4 used in Example 4 was placed on a light box equipped with a linear polarizer P in such an arrangement that the absorption axis of region 18B and the absorption axis of the linear polarizer P were in a crossed Nicol state, and the test pattern in the optical film was observed from the vertical direction. It was confirmed that 18A corresponding to region A was visible as bright, and 18B corresponding to region B was visible as dark (FIG. 11). Next, the same optical film 4 was placed in an arrangement in which the absorption axis of region 18B and the absorption axis of linear polarizer P were in a para-Nicols state, as shown in Fig. 12, and observed at an angle of 30° from the horizontal plane. It was confirmed that 18A corresponding to region A was dark, and 18B corresponding to region B was bright (Fig. 13). This is thought to be because the absorption axis of region 18A and the linear polarizer P were approaching a crossed-Nicols state. From the above observation results, it can be inferred that the optically absorptive anisotropic film used in the present invention has, within the same film surface, a region A in which the absorption axis is inclined at θA relative to the film surface and a region B in which the absorption axis is inclined at θB relative to the film surface, with θB being horizontal and θA being close to vertical.

[0280] Furthermore, although different from the effect of the present invention, in the optically absorptive anisotropic film used in the present invention, it is possible to form an optical film with high transmittance in the direction perpendicular to the film surface and low transmittance from oblique directions by appropriately adjusting the film thickness of the optically absorptive anisotropic film and the sizes of region A and region B. Such an optical film can be expected to be used as a viewing angle control film to prevent people from looking into an image display device (privacy mode) and to prevent the light emitted from the image display device from being reflected on the glass in in-vehicle displays, etc. [Industrial Applicability]

[0281] The present invention can be suitably used in various display devices. [Explanation of symbols]

[0282] 10 EL (electroluminescence) display device 12 EL substrate 12R R light emitting element 12G G light emitting element 12B B light emitting element 14 λ / 4 plate 16 Support 18 Optically Absorbing Anisotropic Film 18A,18B area 20 Optical Film 24 Light-emitting part 26 Photo-alignment film 28 Mask 28a Light transmitting part 28b Light shielding part 30 Optical film surface 31 Absorption axis

Claims

1. An optical film having a light absorption anisotropic film made of a cured product of a liquid crystal composition containing a polymerizable liquid crystal compound and a dichroic dye compound, the optically absorptive anisotropic film has, within the same film plane, a region A in which the inclination of the absorption axis with respect to the film plane is θA and a region B in which the inclination of the absorption axis with respect to the film plane is θB; An optical film in which θA and θB satisfy the relationships of the following formulas (1) and (2): |θA − θB| ≧ 10° Equation (1) 0°≦θB≦5° Formula (2)

2. 2. The optical film according to claim 1, wherein the inclination θA of the absorption axis is 45 to 90°.

3. 3. The optical film according to claim 1, wherein the inclination θA of the absorption axis is 80 to 90°.

4. 4. The optical film according to claim 1, wherein the transmittance in the absorption axis direction of the region A is 65% or more.

5. 5. The optical film according to claim 1, wherein the degree of orientation in the in-plane direction of the region B is 0.950 or more.

6. 6. The optical film according to claim 1, wherein the content of the dichroic dye compound relative to the total mass of the light absorption anisotropic film is 15% by mass or more.

7. An optical laminate comprising the optical film according to any one of claims 1 to 6 and a λ / 4 plate laminated together.

8. An image display device comprising the optical film according to any one of claims 1 to 6 or the optical laminate according to claim 7.

9. An image display device having the optical laminate according to claim 7, The image display device, wherein the sum of the thickness of the optical film and the thickness of the λ / 4 plate is 20 μm or less.

10. 10. The image display device according to claim 8, wherein the position of the region A of the optically absorptive anisotropic film corresponds to the position of a light-emitting element of the image display device.

11. 11. The image display device according to claim 8, wherein the image display device is an electroluminescence display device.

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