JP2021192095A - Optical element and display device - Google Patents

Abstract

To provide optical elements that can sufficiently suppress reflected light from a display device, that prevent coloring, especially redness of the reflected light, and that can thin a light absorption anisotropic layer, and also to provide a display device with high display quality including the optical elements.SOLUTION: Optical elements have at least a light-absorbing anisotropic layer that contains a liquid crystalline compound and a dichroic material. Any of the optical elements contains color matter A with the maximum absorption wavelength ranging between 630 nm and 780 nm. The dichroic material has a different structure from that of the color matter A, and contains a first dichroic material with the maximum absorption wavelength ranging between 560 nm and 640 nm.SELECTED DRAWING: None

Description

The present invention relates to optical elements and display devices.

Conventionally, as a display device typified by an organic electroluminescence (EL) display device, an optical element or a display device having a polarizing element (light absorption anisotropic layer) is widely used.
In recent years, display devices having a highly designed curved surface shape and capable of folding or winding have been developed, and the optical element used in such a display device is required to be thin.
As one of the methods for reducing the thickness of an optical element, for example, Patent Document 1 describes a polarizing element (light absorption anisotropic layer) formed by applying a composition containing a dichroic substance and a liquid crystal compound. A method using an optical element having the above is described.

International Publication No. 2019/151334

An optical element or an optical laminate having a light absorption anisotropic layer may be used for the purpose of imparting an antireflection function to a display device such as an organic EL display device. In this case, in general, an optical laminate in which a light absorption anisotropic layer and a retardation layer such as a λ / 4 plate are laminated is displayed with the light absorption anisotropic layer on the visual side with respect to the surface of the display device. The antireflection function is expressed by sticking them together so as to be.
However, even when an optical laminate having a light absorption anisotropic layer is used, the reflection of an organic EL display device or the like cannot be sufficiently suppressed, the reflectance becomes high, and the reflected light is visually recognized as being colored. There were times when I did. Therefore, when the display device is used in a bright indoor or outdoor place where ambient light exists, the display quality such as contrast and color reproducibility is significantly deteriorated.
Further, according to the study by the present inventors, it was found that the problem that the reflection cannot be sufficiently suppressed is remarkable when the thickness of the light absorption anisotropic layer is thin. Furthermore, it was also found that when the color of the reflected light is reddish, it gives a particularly bad impression to the user.

Therefore, the present invention can sufficiently suppress the reflected light of the display device, prevent the reflected light from being tinted, particularly prevent the reflected light from being reddish, and the light absorption anisotropic layer. An object of the present invention is to provide an optical element that can be made thinner. Another object of the present invention is to provide a display device having the above-mentioned optical elements and having high display quality.

The present inventors have diligently studied to solve the above-mentioned problems, and found that the above-mentioned problems can be solved by the following configurations.

[1] An optical element having at least a light absorption anisotropic layer.
The light absorption anisotropic layer is a layer containing a liquid crystal compound and a dichroic substance.
One of the optical elements contains dye A having a maximum absorption wavelength in the range of 630 nm or more and 780 nm or less.
An optical element in which a dichroic substance has a structure different from that of dye A and contains a first dichroic substance having a maximum absorption wavelength in the range of 560 nm or more and 640 nm or less.
[2] The optical element according to [1], wherein the dye A is a dye having a maximum absorption wavelength in the range of 650 nm or more.
[3] The optical element according to [1], wherein the dye A is a dye having a maximum absorption wavelength in the range of more than 700 nm.
[4] The optical element according to any one of [1] to [3], wherein the content of the first dichroic substance is 5 to 20% by mass with respect to the total mass of the light absorption anisotropic layer. ..
[5] The dichroic substance further contains a second dichroic substance and a third dichroic substance.
The second dichroic substance is a dichroic substance having a maximum absorption wavelength in the range of 455 nm or more and less than 560 nm.
The optical element according to any one of [1] to [4], wherein the third dichroic substance is a dichroic substance having a maximum absorption wavelength in the range of 380 nm or more and less than 455 nm.
[6] The optical element according to any one of [1] to [5], wherein the content of the dichroic substance is 7% by mass or more and 35% by mass or less with respect to the total mass of the light absorption anisotropic layer. ..
[7] The optical element according to any one of [1] to [6], wherein the dye A is contained in the light absorption anisotropic layer.
[8] The optical element according to any one of [1] to [7], wherein the dye A is contained in a layer different from the light absorption anisotropic layer.
[9] The optical element according to any one of [1] to [8], further having a barrier layer.
[10] Any one of [1] to [9], wherein the dye A has any one structure selected from the group consisting of cyanine, anthraquinone, azo, squarylium, pyrrolopyrrole, phthalocyanine, oxonol, and perylene. Optical elements described in.
[11] The optical element according to any one of [1] to [10], wherein the dye A has an anthraquinone structure.
[12] The optical element according to any one of [1] to [11], wherein the visible light average transmittance of the light absorption anisotropic layer is 43% or less.
[13] The optical element according to any one of [1] to [12], wherein the liquid crystal compound contains a liquid crystal compound exhibiting a smectic phase.
[14] The optical element according to any one of [1] to [13], wherein the light absorption anisotropic layer is formed from a composition containing a polymer liquid crystal compound.
[15] A display device having the optical element according to any one of [1] to [14].
[16] The display device according to [15], wherein the dye A contained in the optical element is contained in a layer located on the visual recognition side of the light absorption anisotropic layer of the optical element.

According to the present invention, the reflected light of the display device can be sufficiently suppressed, the tinting of the reflected light is prevented, particularly the reddish tinting of the reflected light is prevented, and the light absorption anisotropic layer is formed. It is possible to provide an optical element that can be made thinner. Further, according to the present invention, it is possible to provide a display device having the above-mentioned optical elements and having high display quality.

Hereinafter, the present invention will be described in detail.
The description of the constituent elements described below may be based on the representative embodiments of the present invention, but the present invention is not limited to such embodiments.
In the present specification, the numerical range represented by using "~" means a range including the numerical values before and after "~" as the lower limit value and the upper limit value.
Further, in the present specification, as each component, a substance corresponding to each component may be used alone or in combination of two or more. Here, when two or more kinds of substances are used in combination for each component, the content of the component means the total content of the substances used in combination unless otherwise specified.
Further, in the present specification, "(meth) acrylate" is a notation representing "acrylate" or "methacrylate", and "(meth) acrylic" is a notation representing "acrylic" or "methacrylic". "(Meta) acryloyl" is a notation representing "acryloyl" or "methacrylic acid".

[Optical element]
The optical element of the present invention has at least a light absorption anisotropic layer.
The light absorption anisotropic layer is a layer containing a liquid crystal compound and a dichroic substance.
Further, the optical element of the present invention contains a dye A having a maximum absorption wavelength in the range of 630 nm or more and 780 nm or less in any of the constituent elements (for example, a light absorption anisotropic layer, a barrier layer, etc.).
Further, the dichroic substance has a structure different from that of the dye A, and contains a first dichroic substance having a maximum absorption wavelength in the range of 560 nm or more and 640 nm or less.

The optical element of the present invention prevents the reflected light from being tinted, and particularly prevents the reflected light from being tinted. The details of the reason for this are not clear, but it is generally considered as follows.
First, the light absorption anisotropic layer of the optical element of the present invention is a layer containing a liquid crystal compound and a dichroic substance.
The dichroic substance has an absorbance in the visible range and generally has a high refractive index.
Therefore, there is a large difference in the refractive index at the interface between the light absorption anisotropic layer and the adjacent layer, or the interface between the dichroic substance and the liquid crystal compound, which causes interfacial reflection or light absorption anisotropic. Internal reflections in the layer can occur. In particular, when the thickness of the light absorption anisotropic layer is thin, the dichroic substance is present in a high concentration in the light absorption anisotropic layer in order to develop the required degree of polarization, and the light absorption is different. The refractive index and the absorption coefficient of the sex layer become larger, and the reflectance becomes higher. Further, due to the abnormal dispersion of the refractive index, the refractive index becomes larger in a wavelength region longer than the maximum absorption wavelength of the dichroic substance, and the reflectance becomes high.
Therefore, in the present invention, the above-mentioned dye A having a maximum absorption wavelength in the range of 630 nm or more and 780 nm or less is contained in the light absorption anisotropic layer or in a layer different from the light absorption anisotropic layer. It is probable that the reflectance could be reduced because the internal reflection or the interfacial reflection was absorbed.
Further, the wavelength of light used for displaying an image in a display device is generally about 600 to 630 nm at the maximum. Therefore, it is considered that by setting the maximum absorption wavelength of the dye A to 630 nm or more, it was possible to effectively prevent reflection while reducing the influence on the display quality such as luminance and color reproducibility.

[Dye A]
As described above, the optical element of the present invention contains a dye A having a maximum absorption wavelength in the range of 630 nm or more and 780 nm or less in any of the components.
Here, the maximum absorption wavelength of the dye A is preferably a dye having a maximum absorption wavelength in the range of 650 nm or more, and has a maximum absorption wavelength in the range of 680 nm or more from the viewpoint of the illuminance of the display device and the white display. It is more preferably a dye, and even more preferably a dye having a maximum absorption wavelength in the range exceeding 700 nm.

In the present invention, there are some preferred embodiments depending on the layer in which the dye A is present and the presence or absence of the orientation, and for example, the following first, second and third embodiments are preferably mentioned.
The first aspect is an aspect in which the dye A is contained in the light absorption anisotropic layer. In this case, there is a high possibility that the dye A can be oriented due to the orientation restricting force of the liquid crystal compound contained in the light absorption anisotropic layer, and the light absorption anisotropic layer can absorb polarized light to a longer wave side. .. However, the effect of the present invention can be obtained even if the orientation of the dye A is insufficient or non-oriented.
The second aspect is an embodiment in which the dye A is contained in a layer different from the light absorption anisotropic layer in a non-oriented manner. In this case, the dye can be used without being oriented, and light can be absorbed regardless of the specific polarization. For example, it is effective when a scattering component is contained. In the display device, it is preferable that the dye A is contained in the layer on the visual side rather than the light absorption anisotropic layer.
The third aspect is an embodiment in which the dye A is oriented and contained in a layer different from the light absorption anisotropic layer. In this case, in order to orient the dye, it is possible to orient it by using a conventionally known method such as stretching or orientation of a liquid crystal display.
Of these embodiments, the second aspect and the third aspect, that is, the dye A is anisotropy for light absorption, because it absorbs not only the internal reflection described above but also the interfacial reflection and the effect of suppressing the reflected light is further improved. It is preferable that the layer is contained in a layer different from the sex layer. In particular, with respect to these aspects, by matching the orientation of the absorption axis of the dye A with the orientation of the absorption axis of the light absorption anisotropic layer, the image display of the display device is not obstructed, and the brightness and color are not obstructed. Antireflection can be effectively performed while the influence on the display quality such as reproducibility is very small.

The specific structure of the dye A will be described.
Dye A is not particularly limited as long as it has a maximum absorption wavelength in the range of 630 nm or more and 780 nm or less. Year, supervised by Sumio Tokita, electronics-related materials, CMC, 1998.
As the dye A, for example, a dye having any one structure selected from the group consisting of cyanine, anthraquinone, azo, squarylium, pyrrolopyrrole, phthalocyanine, oxonol, and perylene is preferable, and cyanine, anthraquinone, azo, and squarylium are preferable. , Pyrrolopyrrole, and a dye having any one structure selected from the group consisting of phthalocyanine are more preferable, and a dye having an anthraquinone structure is further preferable.
In the present specification, the maximum absorption wavelength of the dye A refers to the maximum absorption wavelength in the absorption spectrum measured by the following method.
<Measurement method>
A solution is prepared in which 1.0 mg of the sample (dye A) to be measured is dissolved in 100 ml of chloroform or 100 ml of water.
Next, the prepared solution is placed in a quartz cell (1 cm long square cell), and the absorbance in the wavelength range of 200 to 800 nm of the solution is measured using an ultraviolet visible infrared spectrophotometer U-3150 (Shimadzu Corporation). ..
Next, the maximum absorption wavelength is obtained in the obtained absorption spectrum.

(Cyanine)
When a dye having a cyanine structure (cyanine dye) is used as the dye A, the content of the cyanine dye does not overlap with the wavelength of light of 600 to 630 nm used for image display in a general display device, that is, brightness and color reproduction. It is preferable because it has a small effect on display quality such as sex. Specifically, the mass is 0.1 to 1.0% with respect to the total mass of the composition forming the component containing the cyanine dye (for example, the barrier layer when the barrier layer contains the dye A). Is preferable, and 0.2 to 0.6% by mass is more preferable.
Specific examples of the cyanine pigment are shown below. However, the present invention is not limited to these. The numerical values in parentheses in the specific examples shown below represent the maximum absorption wavelength.

VC1 (704nm)

VC2 (773nm)

V-C3 (683 nm)

V-C4 (746 nm)

V-C5 (670 nm)

V-C6 (780nm)

V-C7 (648nm)

V-C8 (638nm)

(Anthraquinone)
When a dye having an anthraquinone structure (anthraquinone dye) is used as the dye A, the content of the anthraquinone dye does not overlap with the wavelength of light of 600 to 630 nm used for image display in a general display device, that is, brightness and color reproduction. It is preferable because it has a small effect on display quality such as sex. Specifically, the mass is 0.1 to 1.0% with respect to the total mass of the composition forming the component containing the anthraquinone dye (for example, the barrier layer when the barrier layer contains the dye A). Is preferable, and 0.4 to 0.6% by mass is more preferable.
Specific examples of the anthraquinone dye are shown below. However, the present invention is not limited to these.

V-A1 (684 nm)

V-A2 (748nm)

V-A3 (752 nm)

V-A4 (680nm)

V-A5 (680 nm)

V-A6 (760 nm)

V-A7 (683 nm)

V-A8 (750nm)

V-A9 (682 nm)

V-A10 (678 nm)

V-A11 (643nm)

V-A12 (638nm)

(Azo)
When a dye having an azo structure (azo dye) is used as the dye A, the content of the azo dye does not overlap with the wavelength of light of 600 to 630 nm used for image display in a general display device, that is, brightness and color reproduction. It is preferable because it has a small effect on display quality such as sex. Specifically, the mass is 0.1 to 1.0% with respect to the total mass of the composition forming the component containing the azo dye (for example, the barrier layer when the barrier layer contains the dye A). Is preferable, and 0.1 to 0.2% by mass is more preferable.
Specific examples of the azo dye are shown below. However, the present invention is not limited to these.

V-B1 (674 nm)

V-B2 (668 nm)

V-B3 (658nm)

V-B4 (673nm)

V-B5 (689nm)

V-B6 (637 nm)

(Squaririum)
When a dye having a squarylium structure (squarylium dye) is used as the dye A, the content of the squarylium dye does not overlap with the wavelength of light of 600 to 630 nm used for image display in a general display device, that is, brightness and color reproduction. It is preferable because it has a small effect on display quality such as sex. Specifically, the mass is 0.05 to 1.0% with respect to the total mass of the composition forming the component containing the squarylium dye (for example, the barrier layer when the barrier layer contains the dye A). Is preferable, and 0.05 to 0.6% by mass is more preferable.
Specific examples of the squarylium dye are shown below. However, the present invention is not limited to these.

VS1 (736nm)

VS2 (681 nm)

VS3 (798nm)

VS4 (696nm)

VS5 (640nm)

VS6 (711nm)

(Pyrrolopyrrolop)
When a dye having a pyrrolopyrrole structure (pyrolopyrrole dye) is used as the dye A, the content of the pyrrolopyrrole dye does not overlap with the wavelength of light of 600 to 630 nm used for image display in a general display device. It is preferable because it has a small effect on display quality such as color reproducibility and color reproducibility. Specifically, 0.1 to 1.5% with respect to the total mass of the composition forming the component containing the pyrrolopyrrole dye (for example, the barrier layer when the barrier layer contains the dye A). The mass is preferable, and 0.2 to 1.0% by mass is more preferable.
Specific examples of the pyrrolopyrrole dye are shown below. However, the present invention is not limited to these.

VP1 (751nm)

VP2 (780nm)

V-P3 (830 nm)

V-P4 (852nm)

(Pphthalocyanine)
When a dye having a phthalocyanine structure (phthalocyanine dye) is used as the dye A, the content of the phthalocyanine dye does not overlap with the wavelength of light of 600 to 630 nm used for image display in a general display device, that is, brightness and color reproduction. It is preferable because it has a small effect on display quality such as sex. Specifically, the mass is 0.1 to 1.0% with respect to the total mass of the composition forming the component containing the phthalocyanine dye (for example, the barrier layer when the barrier layer contains the dye A). Is preferable, and 0.1 to 0.3% by mass is more preferable.
Specific examples of the phthalocyanine pigment are shown below. However, the present invention is not limited to these.

V-F1 (696nm)

VF2 (745nm)

V-F3 (660nm)

[Light absorption anisotropic layer]
The optical element of the present invention has a light absorption anisotropic layer containing a liquid crystal compound and a dichroic substance.
Further, the dichroic substance has a structure different from that of the dye A described above, and contains a first dichroic substance having a maximum absorption wavelength in the range of 560 nm or more and 640 nm or less.
Here, the light absorption anisotropic layer is formed from a composition for forming a light absorption anisotropic layer (hereinafter, also referred to as “liquid crystal composition”) containing a liquid crystal compound and a dichroic substance. It is preferably a light absorption anisotropic layer.

<Light absorption anisotropic layer forming composition (liquid crystal composition)>
Hereinafter, the components contained in the liquid crystal composition will be described.

(Liquid crystal compound)
The liquid crystal composition contains a liquid crystal compound. By containing the liquid crystal compound, the dichroic substance can be oriented with a high degree of orientation while suppressing the precipitation of the dichroic substance. The liquid crystal compound is a liquid crystal compound that does not exhibit dichroism.

As the liquid crystal compound contained in the liquid crystal composition, either a high molecular weight liquid crystal compound or a low molecular weight liquid crystal compound can be used, and it is preferable to use a high molecular weight liquid crystal compound because the degree of orientation can be increased.
Examples of the polymer liquid crystal compound are described in the thermotropic liquid crystal polymer described in JP-A-2011-237513, paragraphs [0012] to [0042] of International Publication No. 2018/199096. Examples include high molecular weight liquid crystal compounds.
Examples of the low molecular weight liquid crystal compound include liquid crystal compounds described in paragraphs [0072] to [0088] of JP2013-228706A, and among them, a liquid crystal compound exhibiting a smectic phase is preferable.
Further, as the liquid crystal compound, a high molecular weight liquid crystal compound and a low molecular weight liquid crystal compound may be used in combination.

The content of the liquid crystal compound is preferably 50 to 2000 parts by mass, more preferably 100 to 1000 parts by mass, and 200 to 500 parts by mass with respect to 100 parts by mass of the content of the dichroic substance in the liquid crystal composition. More preferred. When the content of the liquid crystal compound is within the above range, the degree of orientation of the light absorption anisotropic layer is further improved.
The liquid crystal compound may be contained alone or in combination of two or more. When two or more kinds of liquid crystal compounds are contained, the content of the liquid crystal compounds means the total content of the liquid crystal compounds.

The liquid crystal compound may contain a polymer liquid crystal compound containing a repeating unit represented by the following formula (1L) (hereinafter, also referred to as “repeating unit (1L)”) for the reason that the effect of the present invention is more excellent. preferable.

In the above formula (1L), 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 mesogen group, and T1 represents a terminal group. ..

Specific examples of the main chain of the repeating unit represented by P1 include groups represented by the following formulas (P1-A) to (P1-D), and among them, a monomer as a raw material. From the viewpoint of versatility and ease of handling, the group represented by the following formula (P1-A) is preferable.

In the formulas (P1-A) to (P1-D), "*" represents the bonding position with L1 in the formula (1L). In the formulas (P1-A) to (P1-D), R ¹ , R ² , R ³ and R ⁴ are independently hydrogen atoms, halogen atoms, alkyl groups having 1 to 10 carbon atoms or 1 to 10 carbon atoms, respectively. Represents the alkoxy group of. The alkyl group may be a linear or branched alkyl group, or may be an alkyl group having a cyclic structure (cycloalkyl group). The number of carbon atoms of the alkyl group is preferably 1 to 5.
The group represented by the formula (P1-A) is preferably one unit of the partial structure of the poly (meth) acrylic acid ester obtained by the polymerization of the (meth) acrylic acid ester.
The group represented by the formula (P1-B) is preferably an ethylene glycol unit formed by ring-opening polymerization of an epoxy group of a compound having an epoxy group.
The group represented by the formula (P1-C) is preferably a propylene glycol unit formed by ring-opening polymerization of the oxetane group of the compound having an oxetane group.
The group represented by the formula (P1-D) is preferably a siloxane unit of a polysiloxane obtained by the condensation polymerization of a compound having at least one of an alkoxysilyl group and a silanol group. Here, examples of the compound having at least one of the alkoxysilyl group and the silanol group include compounds having a group represented by ^{the formula SiR 4} (OR ⁵ ) _{2 −.} Wherein, ^{R 4} has the same meaning as ^{R 4} in (P1-D), to each of a plurality of ^{R 5} independently represent a hydrogen atom or an alkyl group having 1 to 10 carbon atoms.

L1 is a single bond or divalent linking group.
The divalent linking groups represented by L1 are -C (O) O-, -OC (O)-, -O-, -S-, -C (O) NR ^3- , -NR ³ C (O). -, - SO ₂ -, and, ^-NR 3 ^{R 4} -, and the like. In the formula, R ³ and R ⁴ each independently represent a hydrogen atom and an alkyl group having 1 to 6 carbon atoms which may have a substituent W (described later).
When P1 is a group represented by the formula (P1-A), L1 is preferably a group represented by −C (O) O— for the reason that the effect of the present invention is more excellent.
When P1 is a group represented by the formulas (P1-B) to (P1-D), L1 is preferably a single bond for the reason that the effect of the present invention is more excellent.

The spacer group represented by SP1 is at least one selected from the group consisting of an oxyethylene structure, an oxypropylene structure, a polysiloxane structure and a fluorinated alkylene structure because of its tendency to exhibit liquid crystallinity and the availability of raw materials. It preferably contains the structure of the species.
Here, the oxyethylene structure represented by SP1 is preferably a group represented by _{* − (CH 2-} CH ₂ O) _{n1 − *.} In the formula, n1 represents an integer of 1 to 20, and * represents a coupling position with L1 or M1 in the above formula (1L). n1 is preferably an integer of 2 to 10, more preferably an integer of 2 to 4, and most preferably 3 for the reason that the effect of the present invention is more excellent.
Further, the oxypropylene structure represented by SP1 is preferably a group represented by _{*-(CH (CH 3} ) -CH ₂ O) _n2- * because the effect of the present invention is more excellent. In the formula, n2 represents an integer of 1 to 3 and * represents a coupling position with L1 or M1.
Further, the polysiloxane structure represented by SP1 is preferably a group represented by _{*-(Si (CH 3} ) _2- O) _n3- * because the effect of the present invention is more excellent. In the formula, n3 represents an integer of 6 to 10, and * represents the coupling position with L1 or M1.
Further, as the fluorinated alkylene structure represented by SP1, a group represented by _{*-(CF 2- CF 2} ) _{n4- * is preferable because the effect of the present invention is more excellent.} In the formula, n4 represents an integer of 6 to 10, and * represents the coupling position with L1 or M1.

The mesogen group represented by M1 is a group showing the main skeleton of a liquid crystal molecule that contributes to the formation of a liquid crystal. The liquid crystal molecule exhibits liquid crystallinity, which is an intermediate state (mesophase) between the crystalline state and the isotropic liquid state. There are no particular restrictions on the mesogen group, for example, "Flushy Christalle in Tabellen II" (VEB Deutsche Verlag fur Grundstoff Industrie, Leipzig, 1984), especially the description on pages 7 to 16 and the liquid crystal, and the liquid crystal. You can refer to the edition, LCD Handbook (Maruzen, 2000), especially the description in Chapter 3.
As the mesogen group, 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 is preferable.
The mesogen group preferably has an aromatic hydrocarbon group, more preferably 2 to 4 aromatic hydrocarbon groups, and 3 aromatic hydrocarbon groups, for the reason that the effect of the present invention is more excellent. It is more preferable to have.

As the mesogen group, the following formula (M1-A) or the following formula (M1-) is used because it is more excellent in terms of expression of liquid crystallinity, adjustment of liquid crystal phase transition temperature, availability of raw materials and synthetic suitability, and the effect of the present invention. The group represented by B) is preferable, and the group represented by the formula (M1-B) is more preferable.

In formula (M1-A), A1 is a divalent group selected from the group consisting of aromatic hydrocarbon groups, heterocyclic groups and alicyclic groups. These groups may be substituted with an alkyl group, an alkyl fluoride group, an alkoxy group or a substituent W (described later).
The divalent group represented by A1 is preferably a 4- to 6-membered ring. Further, the divalent group represented by A1 may be a monocyclic ring or a condensed ring.
* Represents the binding position with SP1 or T1.

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 viewpoint of properties and the like, a phenylene group or a naphthylene group is preferable, and a phenylene group is more preferable.

The divalent heterocyclic group represented by A1 may be either aromatic or non-aromatic, but a divalent aromatic heterocyclic group is preferable from the viewpoint of further improving the degree of orientation. ..
Examples of the atom other than carbon constituting the divalent aromatic heterocyclic group include a nitrogen atom, a sulfur atom and an oxygen atom. When the aromatic heterocyclic group has a plurality of atoms constituting a ring other than carbon, they may be the same or different.
Specific examples of the divalent aromatic heterocyclic group include pyridylene group (pyridine-diyl group), pyridazine-diyl group, imidazole-diyl group, thienylene (thiophene-diyl group), and quinolylene group (quinolin-diyl group). ), Isoquinolylene group (isoquinolin-diyl group), oxazole-diyl group, thiazole-diyl group, oxadiazol-diyl group, benzothiazole-diyl group, benzothiazol-diyl group, phthalimide-diyl group, thienothiazole-diyl group. , Thiazolothiazole-diyl group, thienothiophene-diyl group, thienooxazol-diyl group and the like.

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

In the formula (M1-A), a1 represents an integer of 1 to 10. When a1 is 2 or more, the plurality of A1s may be the same or different.

In formula (M1-B), A2 and A3 are each independently a divalent group selected from the group consisting of aromatic hydrocarbon groups, heterocyclic groups and alicyclic groups. Specific examples and preferred embodiments of A2 and A3 are the same as those of A1 of the formula (M1-A), and thus the description thereof will be omitted.
In the formula (M1-B), a2 represents an integer of 1 to 10, and when a2 is 2 or more, a plurality of A2s may be the same or different, and a plurality of A3s may be the same or different. Often, the plurality of LA1s may be the same or different. a2 is preferably an integer of 2 or more, and more preferably 2 for the reason that the effect of the present invention is more excellent.
In formula (M1-B), when a2 is 1, LA1 is a divalent linking group. When a2 is 2 or more, the plurality of LA1s are independently single-bonded or divalent linking groups, and at least one of the plurality of LA1s is a divalent linking group. When a2 is 2, it is preferable that one of the two LA1s is a divalent linking group and the other is a single bond, for the reason that the effect of the present invention is more excellent.

In the formula (M1-B), the divalent linking groups represented by LA1 are −O−, − (CH ₂ ) _g −, − (CF ₂ ) _g −, −Si (CH ₃ ) ₂ −, − ( Si (CH ₃ ) ₂ O) _g −, − (OSi (CH ₃ ) ₂ ) _g − (g represents an integer of 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-, -O-C (O) O-, -N (Z) C (O)-, -C (O) N (Z)-, -C (Z) = C ( Z')-C (O) O-, -O-C (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) = N-N = C (Z' )-(Z, Z', Z "independently represents hydrogen, 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-, -S (O)-, -S (O) (O)-,-(O) S (O) O-, -O (O) S (O) O-, -SC (O)-, -C (O) S- and the like can be mentioned. Among them, -C (O) O- is preferable because the effect of the present invention is more excellent. LA1 is a group thereof. It may be a group which is a combination of two or more.

Specific examples of M1 include the following structures. In the following specific example, "Ac" represents an acetyl group.

The terminal group represented by T1 includes a hydrogen atom, a halogen atom, a cyano group, a nitro group, a hydroxy group, an alkyl group having 1 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms, and an alkylthio group having 1 to 10 carbon atoms. An alkoxycarbonyloxy group having 1 to 10 carbon atoms, an alkoxycarbonyl group having 1 to 10 carbon atoms (ROC (O)-: R is an alkyl group), an acyloxy group having 1 to 10 carbon atoms, and an acylamino group having 1 to 10 carbon atoms. , An alkoxycarbonylamino group having 1 to 10 carbon atoms, a sulfonylamino group having 1 to 10 carbon atoms, a sulfamoyl group having 1 to 10 carbon atoms, a carbamoyl group having 1 to 10 carbon atoms, a sulfinyl group having 1 to 10 carbon atoms, and , Ureid group having 1 to 10 carbon atoms, (meth) acryloyloxy group-containing group and the like. Examples of the (meth) acryloyloxy group-containing group include -LA (L represents a single bond or a linking group. Specific examples of the linking group are the same as those of L1 and SP1 described above. A is (meth). A group represented by (representing an acryloyloxy group) can be mentioned.
For T1, the alkoxy group having 1 to 10 carbon atoms is preferable, the alkoxy group having 1 to 5 carbon atoms is more preferable, and the methoxy group is further preferable, because the effect of the present invention is more excellent. These terminal groups may be further substituted with these groups or the crosslinkable groups described above.
The number of atoms in the main chain of T1 is preferably 1 to 20, more preferably 1 to 15, further preferably 1 to 10, and particularly preferably 1 to 7 because the effect of the present invention is more excellent. When the number of atoms in the main chain of T1 is 20 or less, the degree of orientation of the light absorption anisotropic layer is further improved. Here, the "main chain" in T1 means the longest molecular chain bonded to M1, and the hydrogen atom is not counted in the number of atoms in the main chain of T1. For example, when T1 is an n-butyl group, the number of atoms in the main chain is 4, and when T1 is a sec-butyl group, the number of atoms in the main chain is 3.

The content of the repeating unit (1 L) is preferably 20 to 100% by mass with respect to 100% by mass of all the repeating units of the polymer liquid crystal compound because the effect of the present invention is more excellent.
In the present invention, the content of each repeating unit contained in the polymer liquid crystal compound is calculated based on the charged amount (mass) of each monomer used to obtain each repeating unit.
The repeating unit (1 L) may be contained alone or in combination of two or more in the polymer liquid crystal compound. Among them, for the reason that the effect of the present invention is more excellent, it is preferable that two kinds of repeating units (1 L) are contained in the polymer liquid crystal compound.

When the polymer liquid crystal compound contains two kinds of repeating units (1L), the terminal group represented by T1 in one (repeating unit A) is an alkoxy group and the other (repeating unit B) because the effect of the present invention is more excellent. ), The terminal group represented by T1 is preferably a group other than the alkoxy group.
The terminal group represented by T1 in the repeating unit B is preferably an alkoxycarbonyl group, a cyano group, or a (meth) acryloyloxy group-containing group, and is preferably an alkoxycarbonyl group or an alkoxycarbonyl group, because the effect of the present invention is more excellent. , Cyano groups are more preferred.
The ratio (A / B) of the content of the repeating unit A in the polymer liquid crystal compound and the content of the repeating unit B in the polymer liquid crystal compound is 50 because the effect of the present invention is more excellent. It is preferably / 50 to 95/5, more preferably 60/40 to 93/7, and even more preferably 70/30 to 90/10.

Further, the polymer liquid crystal compound may have a repeating unit (1 L) and a repeating unit having no mesogen group. Examples of the repeating unit having no mesogen group include a repeating unit in which M1 in the formula (1L) is a single bond.
When the polymer liquid crystal compound has a repeating unit having no mesogen group, it is preferably more than 0% by mass and 20% by mass or less with respect to 100% by mass of all the repeating units of the polymer liquid crystal compound.

(Weight average molecular weight)
The weight average molecular weight (Mw) of the polymer liquid crystal compound is preferably 1000 to 500,000, more preferably 2000 to 300,000 because the effect of the present invention is more excellent. When the Mw of the polymer liquid crystal compound is within the above range, the handling of the polymer liquid crystal compound becomes easy.
In particular, from the viewpoint of suppressing cracks during coating, the weight average molecular weight (Mw) of the polymer liquid crystal compound is preferably 10,000 or more, and more preferably 1000 to 300,000.
Further, from the viewpoint of the temperature latitude of the degree of orientation, the weight average molecular weight (Mw) of the polymer liquid crystal compound is preferably less than 10,000, and preferably 2000 or more and less than 10,000.
Here, the weight average molecular weight and the number average molecular weight in the present invention are values measured by a gel permeation chromatograph (GPC) method.
-Solvent (eluent): N-methylpyrrolidone-Device name: TOSOH HLC-8220GPC
-Column: Use by connecting three TOSOH TSKgelSuperAWM-H (6 mm x 15 cm)-Column temperature: 25 ° C
-Sample concentration: 0.1% by mass
・ Flow velocity: 0.35 mL / min
-Calibration curve: TSK standard polystyrene made by TOSOH A calibration curve with 7 samples from Mw = 2800000 to 1050 (Mw / Mn = 1.03 to 1.06) is used.

The substituent W in the present specification will be described.
The substituent W is, for example, an alkyl group (preferably an alkyl group having 1 to 20 carbon atoms, more preferably 1 to 12 carbon atoms, particularly preferably 1 to 8 carbon atoms, and for example, a methyl group or an ethyl group. Isopropyl group, tert-butyl group, n-octyl group, n-decyl group, n-hexadecyl group, cyclopropyl group, cyclopentyl group, cyclohexyl group and the like), alkenyl group (preferably 2 to 20 carbon atoms). , More preferably an alkenyl group having 2 to 12 carbon atoms, particularly preferably 2 to 8 carbon atoms, and examples thereof include a vinyl group, an aryl group, a 2-butenyl group, a 3-pentenyl group and the like), alkynyl. A group (preferably an alkynyl group having 2 to 20 carbon atoms, more preferably 2 to 12 carbon atoms, particularly preferably 2 to 8 carbon atoms, and examples thereof include a propargyl group and a 3-pentynyl group). An aryl group (preferably an aryl group having 6 to 30 carbon atoms, more preferably 6 to 20 carbon atoms, particularly preferably 6 to 12 carbon atoms, for example, a phenyl group, a 2,6-diethylphenyl group, 3,5 -Ditrifluoromethylphenyl group, styryl group, naphthyl group, biphenyl group and the like), substituted or unsubstituted amino group (preferably 0 to 20 carbon atoms, more preferably 0 to 10 carbon atoms, particularly preferable. Is an amino group having 0 to 6 carbon atoms, and examples thereof include an unsubstituted amino group, a methylamino group, a dimethylamino group, a diethylamino group, an anirino group and the like), an alkoxy group (preferably 1 to 20 carbon atoms). , More preferably 1 to 15 carbon atoms, such as a methoxy group, an ethoxy group, a butoxy group and the like, an oxycarbonyl group (preferably 2 to 20 carbon atoms, more preferably 2 to 15 carbon atoms). , Particularly preferably 2 to 10, such as a methoxycarbonyl group, an ethoxycarbonyl group, a phenoxycarbonyl group, etc.), an acyloxy group (preferably 2 to 20 carbon atoms, more preferably 2 to 10 carbon atoms). Particularly preferably 2 to 6, for example, an acetoxy group, a benzoyloxy group, an acryloyl group, a methacryloyl group and the like), an acylamino group (preferably 2 to 20 carbon atoms, more preferably 2 to 2 carbon atoms). 10, particularly preferably 2 to 6 carbon atoms, and examples thereof include an acetylamino group and a benzoylamino group), alkoxycarbonylamino. A group (preferably 2 to 20 carbon atoms, more preferably 2 to 10 carbon atoms, particularly preferably 2 to 6 carbon atoms, and examples thereof include a methoxycarbonylamino group), an aryloxycarbonylamino group (preferably). It has 7 to 20 carbon atoms, more preferably 7 to 16 carbon atoms, particularly preferably 7 to 12 carbon atoms, and examples thereof include a phenyloxycarbonylamino group) and a sulfonylamino group (preferably 1 to 20 carbon atoms). , More preferably 1 to 10 carbon atoms, particularly preferably 1 to 6 carbon atoms, and examples thereof include a methanesulfonylamino group and a benzenesulfonylamino group), a sulfamoyl group (preferably 0 to 20 carbon atoms). , More preferably 0 to 10 carbon atoms, particularly preferably 0 to 6 carbon atoms, and examples thereof include a sulfamoyl group, a methyl sulfamoyl group, a dimethyl sulfamoyl group, and a phenyl sulfamoyl group). , Carbamoyl groups (preferably 1 to 20 carbon atoms, more preferably 1 to 10 carbon atoms, particularly preferably 1 to 6 carbon atoms, such as unsubstituted carbamoyl groups, methylcarbamoyl groups, diethylcarbamoyl groups, and A phenylcarbamoyl group or the like), an alkylthio group (preferably 1 to 20 carbon atoms, more preferably 1 to 10 carbon atoms, particularly preferably 1 to 6 carbon atoms, for example, a methylthio group, an ethylthio group, etc. ), Arylthio groups (preferably 6 to 20, more preferably 6 to 16, particularly preferably 6 to 12, such as phenylthio groups), sulfonyl groups (preferably). Has 1 to 20 carbon atoms, more preferably 1 to 10 carbon atoms, particularly preferably 1 to 6 carbon atoms, and examples thereof include a mesyl group and a tosyl group), and a sulfinyl group (preferably 1 carbon number). ~ 20, more preferably 1 to 10 carbon atoms, particularly preferably 1 to 6 carbon atoms, and examples thereof include a methanesulfinyl group and a benzenesulphinyl group), a ureido group (preferably 1 to 20 carbon atoms). , More preferably 1 to 10 carbon atoms, particularly preferably 1 to 6 carbon atoms, and examples thereof include unsubstituted ureido group, methyl ureido group, phenyl ureido group and the like), phosphate amide group (preferably. Is 1 to 20 carbon atoms, more preferably 1 to 10 carbon atoms, particularly preferably 1 to 6 carbon atoms, and for example, a diethyl phosphate amide group and , Phylphosphoric acid amide group, etc.), hydroxy group, mercapto group, halogen atom (eg, fluorine atom, chlorine atom, bromine atom, and iodine atom), cyano group, nitro group, hydroxamic acid group, sulfino A group, a hydrazino group, an imino group, an azo group, a heterocyclic group (preferably a heterocyclic group having 1 to 30 carbon atoms, more preferably a heterocyclic group having 1 to 12 carbon atoms, for example, a nitrogen atom, an oxygen atom, a sulfur atom and the like. It is a heterocyclic group having a heteroatom, for example, an epoxy group, an oxetanyl group, an imidazolyl group, a pyridyl group, a quinolyl group, a fryl group, a piperidyl group, a morpholino group, a maleimide group, a benzoxazolyl group, a benzimidazolyl group, and a heterocyclic group. , A benzthiazolyl group and the like), a silyl group (preferably a silyl group having 3 to 40 carbon atoms, more preferably 3 to 30 carbon atoms, particularly preferably a silyl group having 3 to 24 carbon atoms, for example, a trimethylsilyl group, And a triphenylsilyl group and the like), a carboxy group, a sulfonic acid group, a phosphoric acid group and the like.

The liquid crystal compound in the present invention may contain a low molecular weight liquid crystal compound represented by the following formula (LC) for the reason that the effect of the present invention is more excellent.

In formula (LC), Q1 and Q2 each independently represent a crosslinkable group or a terminal group, SPL1 and SPL2 each independently represent a spacer group, ML represents a mesogen group, and at least one of Q1 and Q2 is crosslinkable. It is a group (polymerizable group).

Since SPL1 and SPL2 each independently represent the same structure as SP1 in the above formula (1L), the description thereof will be omitted.
Since ML represents the same structure as M1 in the above formula (1L), the description thereof will be omitted.

Q1 and Q2 are independently hydrogen atom, halogen atom, linear, branched or cyclic alkyl group having 1 to 20 carbon atoms, alkoxy group having 1 to 20 carbon atoms, alkenyl group having 1 to 20 carbon atoms, and carbon number of carbon atoms. Alkinyl group of 1 to 20, aryl group of 1 to 20 carbon atoms, heterocyclic group (may be called heterocyclic group), cyano group, hydroxy group, nitro group, carboxy group, aryloxy group, silyloxy group, hetero Ring oxy group, acyloxy group, carbamoyloxy group, alkoxycarbonyloxy group, aryloxycarbonyloxy group, amino group (including anilino group), ammonio group, acylamino group, aminocarbonylamino group, alkoxycarbonylamino group, aryloxycarbonyl Amino group, sulfamoylamino group, alkyl or arylsulfonylamino group, mercapto group, alkylthio group, arylthio group, heterocyclic thio group, sulfamoyl group, sulfo group, alkyl or arylsulfinyl group, alkyl or arylsulfonyl group, acyl group , Aryloxycarbonyl group, alkoxycarbonyl group, carbamoyl group, aryl or heterocyclic azo group, imide group, phosphino group, phosphinyl group, phosphinyloxy group, phosphinylamino group, phosphono group, silyl group, hydrazino group, It is represented by a ureido group, a boronic acid group (-B (OH) ₂ ), a phosphat group (-OPO (OH) ₂ ), a sulfato group (-OSO ₃ H), and the following formulas (P1) to (P-30). Represents a crosslinkable group (polymerizable group).

In the above formulas (P-1) to (P-30), ^RP is a hydrogen atom, a halogen atom, a linear, branched or cyclic alkylene group having 1 to 10 carbon atoms, or an alkyl halide having 1 to 20 carbon atoms. A group, 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, and a heterocyclic group (may 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 (anilino group) Includes), ammonio group, acylamino group, aminocarbonylamino group, alkoxycarbonylamino group, aryloxycarbonylamino group, sulfamoylamino group, alkyl or arylsulfonylamino group, mercapto group, alkylthio group, arylthio group, heterocyclic thio Group, sulfamoyl group, sulfo group, alkyl or arylsulfinyl group, alkyl or arylsulfonyl group, acyl group, aryloxycarbonyl group, alkoxycarbonyl group, carbamoyl group, aryl or heterocyclic azo group, imide group, phosphino group, phosphinyl group , Phosphinyloxy group, phosphinylamino group, phosphono group, silyl group, hydrazino group, ureido group, boronic acid group (-B (OH) ₂ ), phosphat group (-OPO (OH) ₂ ), sulfato group. Represents (-OSO ₃ H), and the plurality of ^RPs may be the same or different.
Preferred embodiments of the crosslinkable group include a radically polymerizable group or a cationically polymerizable group, and examples of the radically polymerizable group include a vinyl group represented by the above formula (P-1) and the above formula (the above formula (P-1). A butadiene group represented by P-2), a (meth) acryloyloxy group represented by the above formula (P-4), a (meth) acrylamide group represented by the above formula (P-5), and the above formula (P). The vinyl acetate group represented by -6), the fumaric acid ester group represented by the above formula (P-7), the styryl group represented by the above formula (P-8), and the above formula (P-9). The vinylpyrrolidone group, the maleic anhydride represented by the above formula (P-11), and the maleimide group represented by the above formula (P-12) are preferable, and the cationically polymerizable group is the above formula (P-12). A vinyl ether group represented by -18), an epoxy group represented by the above formula (P-19), and an oxetanyl group represented by the above formula (P-20) are preferable. Of these, the (meth) acryloyloxy group, which is a radically polymerizable group, is particularly preferable.

Specific examples of the low-molecular-weight liquid crystal compound include the structures shown below, but the low-molecular-weight liquid crystal compound is not limited thereto.

The liquid crystal property of the low molecular weight liquid crystal compound may be either nematic or smectic. The temperature range showing liquid crystallinity is preferably room temperature (23 ° C.) to 300 ° C., and more preferably 40 to 250 ° C. from the viewpoint of handling and manufacturing suitability.

(Dichroic substance)
The liquid crystal composition contains a dichroic substance. In the present invention, the dichroic substance means a dye having different absorbance depending on the direction. By containing a dichroic substance, the degree of orientation of the light absorption anisotropic layer is improved.
The bicolor substance is not particularly limited as long as it contains at least the first bicolor substance described later, and is a visible light absorbing substance (bicolor dye), a light emitting substance (fluorescent substance, a phosphorescent substance), and an ultraviolet ray. Examples thereof include an absorbent substance, an infrared absorber, a non-linear optical substance, a carbon nanotube, an inorganic substance (for example, a quantum rod), and a conventionally known bicolor substance (bicolor dye) can be used.
Specifically, for example, paragraphs [0067] to [0071] of JP2013-228706, paragraphs [0008] to [0026] of JP2013-227532A, and paragraphs [0008] to [0026] of JP2013-209367, [Japanese Patent Laid-Open No. 2013-209367]. 0008]-[0015] paragraphs, Japanese Patent Application Laid-Open No. 2013-14883 [0045]-[0058] paragraphs, Japanese Patent Application Laid-Open No. 2013-109090 [0012]-[0029] paragraphs, Japanese Patent Application Laid-Open No. 2013-101328 Paragraphs [0009] to [0017], paragraphs [0051] to [0065] of JP2013-37353, paragraphs [0049] to [0073] of JP2012-63387, JP-A-11-305036. Paragraphs [0016] to [0018], paragraphs [0009] to [0011] of JP-A-2001-133630, JP-A-2011-215337, [0030]-[0169], JP-A-2010-106242. Paragraphs [0021] to [0075], paragraphs [0011] to [0025] of JP2010-215846A, paragraphs [0017] to [0069] of JP2011-048311A, JP2011-213610. Paragraphs [0013] to [0133] of JP-A, paragraphs [0074] to [0246] of JP-A-2011-237513, paragraphs [0005]-[0051] of JP-A-2016-006502, paragraphs 2018-053167. No. [0014] to [0032] paragraphs, Japanese Patent Application Laid-Open No. 200-1716, paragraphs [0014] to [0033], International Publication No. 2016/060173, paragraphs [0005] to [0041], International Publication 2016 / Paragraphs [0008] to [0062] of Japanese Patent Publication No. 136651, paragraphs [0014] to [0033] of International Publication No. 2017/154835, paragraphs [0014] to [0033] of International Publication No. 2017/154695, International Publication No. 2017/195833, paragraphs [0013] to [0037], International Publication No. 2018/164252, paragraphs [0014] to [0034], International Publication No. 2018/186503, paragraphs [0021] to [0030], International Publication In paragraphs [0043] to [0063] of No. 2019/189345, paragraphs [0043] to [705] of International Publication No. 2019/225468, paragraphs [0050] to [0074] of International Publication No. 2020/004106, etc. The ones described are mentioned.
The dichroic substance may be used alone or in combination of two or more.

Moreover, the following specific examples are also given as a dichroic substance.

The dichroic substance may have a crosslinkable group (polymerizable group).
Specific examples of the crosslinkable group include (meth) acryloyl group, epoxy group, oxetanyl group, styryl group and the like, and among them, (meth) acryloyl group is preferable.

The content of the dichroic substance is such that the degree of orientation of the formed light absorption anisotropic layer is higher, the heat resistance is further improved, and the internal reflection is suppressed. Therefore, the solid content 100 in the liquid crystal composition is 100. It is preferably 4 to 50% by mass, more preferably 7 to 35% by mass, further preferably 15 to 30% by mass, and most preferably 20 to 30% by mass with respect to the mass%.
For the same reason, the content of the dichroic substance is preferably 7 to 35% by mass, more preferably 15 to 30% by mass, and 20 by mass, based on the total mass of the light absorption anisotropic layer. ~ 30% by mass is more preferable. The content of the dichroic substance is the total content of the first dichroic substance, the second dichroic substance and the third dichroic substance, which will be described later. It means that.
For the same reason, the content of the first dichroic substance described later is preferably 5 to 20% by mass, preferably 7 to 15% by mass, based on the total mass of the light absorption anisotropic layer. Is more preferable.

The dichroic substance contained in the light absorption anisotropic layer or the liquid crystal composition includes the first dichroic substance shown below and the first dichroic substance for the reason that the tint of the light absorption anisotropic layer can be easily adjusted. It is preferable to use a dichroic substance of 2 and / or a third dichroic substance in combination.

The first dichroic substance The first dichroic substance has a structure different from that of the dye A described above, and has a maximum absorption wavelength in the range of 560 nm or more and 640 nm or less (preferably 560 nm or more and less than 630 nm). It is a sex substance.
In the present specification, the maximum absorption wavelength of the dichroic substance means the maximum absorption wavelength in the absorption spectrum measured by the same method as the maximum absorption wavelength of the dye A described above.

The first dichroic substance is preferably a compound represented by the formula (1).

In the formula (1), Ar1 and Ar2 independently represent a phenylene group which may have a substituent and a naphthylene group which may have a substituent, respectively, and the effect of the present invention is more excellent. Phenylene groups are preferred.

In the formula (1), R1 may have a hydrogen atom and a substituent, an alkyl group, an alkoxy group, an alkylthio group, an alkylsulfonyl group, an alkylcarbonyl group, an alkyloxycarbonyl group, an acyloxy group and an alkyl carbonate group. , Alkylamino group, acylamino group, alkylcarbonylamino group, alkoxycarbonylamino group, alkylsulfonylamino group, alkylsulfamoyl group, alkylcarbamoyl group, alkylsulfinyl group, alkylureido group, alkylphosphate amide group, alkylimino group , Or an alkylsilyl group.
As the alkyl group having a substituent in R1, the carbon atom of the alkyl group is -O-, -CO-, -C (O) -O-, -O-C (O)-, -Si (CH ₃ ) _2. -O-Si (CH ₃ ) _2- , -N (R1')-, -N (R1')-CO-, -CO-N (R1')-, -N (R1')-C (O) -O-, -O-C (O) -N (R1')-, -N (R1')-C (O) -N (R1')-, -CH = CH-, -C≡C-, Examples include groups substituted with −N = N−, −C (R1 ′) = CH—C (O) − or −O—C (O) −O−. One or more carbon atoms of the alkyl group may be substituted with the above group, or two or more may be substituted with the above group.
The number of carbon atoms of the alkyl group in R1 is preferably 1 to 20, more preferably 2 to 18, further preferably 4 to 14, and particularly preferably 8 to 12.
The alkyl group in R1 may have any linear, branched or cyclic structure, but is preferably linear or branched, and more preferably linear, from the viewpoint of further improving the effect of the present invention. ..
When R1 is a group other than a hydrogen atom, the hydrogen atom of each group is a halogen atom, a nitro group, a cyano group, -N (R1') ₂ , an amino group, -C (R1') = C (R1'). ) -NO ₂ , -C (R1') = C (R1')-CN, or -C (R1') = C (CN) ₂ . One or more hydrogen atoms of each group may be substituted with the above group, or two or more may be substituted with the above group.
R1'represents a hydrogen atom or a linear or branched alkyl group having 1 to 6 carbon atoms. When a plurality of R1'are present in each group, they may be the same or different from each other.

In formula (1), R2 and R3 may independently have a hydrogen atom and a substituent, respectively, an alkyl group, an alkenyl group, an alkoxy group, an acyl group, an alkyloxycarbonyl group, an alkylamide group, and an alkylsulfonyl. Represents a group, an aryl group, an arylcarbonyl group, an arylsulfonyl group, an aryloxycarbonyl group, or an arylamide group.
As the alkyl group having a substituent in R2 and R3, the carbon atom of the alkyl group is -O-, -S-, -C (O)-, -C (O) -O-, -O-C (O). -, -C (O) -S-, -S-C (O)-, _{-Si (CH 3} ) ₂ -O-Si (CH ₃ ) _2- , -NR2'-, -NR2'-CO-, -CO-NR2'-, -NR2'-C (O) -O-, -O-C (O) -NR2'-, -NR2'-C (O) -NR2'-, -CH = CH-, Examples thereof include groups substituted with −C≡C−, −N = N−, −C (R2 ′) = CH—C (O) −, or −OC (O) −O−. One or more carbon atoms of the alkyl group may be substituted with the above group, or two or more may be substituted with the above group.
The number of carbon atoms of the alkyl group in R2 and R3 is preferably 1 to 20, more preferably 1 to 16, still more preferably 1 to 8, and particularly preferably 1 to 4.
The alkyl group in R2 and R3 may have any linear, branched or cyclic structure, but the linear or branched structure is preferable, and the linear group is preferable because the effect of the present invention is more excellent. More preferred.
When R2 and R3 are groups other than hydrogen atoms, the hydrogen atoms of each group are halogen atom, nitro group, cyano group, -OH group, -N (R2') ₂ , amino group, -C (R2'). ) = C (R2')-NO ₂ , -C (R2') = C (R2') -CN, -C (R2') = C (CN) ₂ . One or more hydrogen atoms of each group may be substituted with the above group, or two or more may be substituted with the above group.
R2'represents a hydrogen atom or a linear or branched alkyl group having 1 to 6 carbon atoms. When a plurality of R2'are present in each group, they may be the same or different from each other.
R2 and R3 may be bonded to each other to form a ring, and R2 or R3 may be bonded to Ar2 to form a ring.

From the viewpoint that the effect of the present invention is more excellent, R1 is preferably an electron-withdrawing group, and R2 and R3 are preferably groups with low electron-donating properties.
Specific examples of the group in which R1 is an electron-withdrawing group include an alkylsulfonyl group, an alkylcarbonyl group, an alkyloxycarbonyl group, an acyloxy group, an alkylsulfonylamino group, an alkylsulfamoyl group, an alkylsulfinyl group, and an alkyl. Examples thereof include a ureido group and an alkyl group in which a carbon atom is substituted with -C (O) -O- and -O-. As the alkyl group in which the carbon atom is substituted with —C (O) —O— and —O−, the group represented by R11-C (O) —O—R12—O− is preferable. R11 represents a linear or branched alkyl group having 1 to 6 carbon atoms (preferably 1 to 3 carbon atoms), and R12 is a linear chain having 1 to 20 carbon atoms (preferably 2 to 18 carbon atoms). Represents a shaped or branched alkylene group.
Specific examples of cases where R2 and R3 are groups having a low electron donating property include groups having the following structures. The group having the following structure is shown in the above formula (1) in a form containing a nitrogen atom to which R2 and R3 are bonded.

Specific examples of the first dichroic substance are shown below, but the present invention is not limited thereto.

Second dichroic substance The second dichroic substance is a dichroic substance having a maximum absorption wavelength in the range of 455 nm or more and less than 560 nm (preferably 455 to 555 nm, more preferably 455 to 550 nm).

The second dichroic substance is preferably a compound represented by the formula (2).

In the formula (2), n represents 1 or 2, and 1 is preferable because the effect of the present invention is more excellent.
In formula (2), Ar3, Ar4 and Ar5 independently have a phenylene group which may have a substituent, a naphthylene group which may have a substituent or a complex which may have a substituent. A phenylene group which may have a substituent is preferable because it represents a ring group and the effect of the present invention is more excellent.
The heterocyclic group may be either aromatic or non-aromatic.
Examples of the atom other than carbon constituting the aromatic heterocyclic group include a nitrogen atom, a sulfur atom and an oxygen atom. When the aromatic heterocyclic group has a plurality of atoms constituting a ring other than carbon, they may be the same or different.
Specific examples of the aromatic heterocyclic group include pyridylene group (pyridine-diyl group), pyridazine-diyl group, imidazole-diyl group, thienylene (thiophene-diyl group), quinolylene group (quinolin-diyl group), and isoquinolylene. Group (isoquinoline-diyl group), oxazole-diyl group, thiazole-diyl group, oxazazole-diyl group, benzothiazole-diyl group, benzothiazol-diyl group, phthalimide-diyl group, thienothiazole-diyl group, thiazolo Examples thereof include a thiazole-diyl group, a thienothiophene-diyl group, and a thienooxazol-diyl group.

The definition of R4 in the formula (2) is the same as that of R1 in the formula (1).
The definitions of R5 and R6 in the formula (2) are the same as those of R2 and R3 in the formula (1), respectively.

From the viewpoint of durability, R4 is preferably an electron-withdrawing group, and R5 and R6 are preferably groups with low electron donating properties.
Among such groups, the specific example when R4 is an electron-withdrawing group is the same as the specific example when R1 is an electron-withdrawing group, and R5 and R6 are groups with low electron donating property. The specific example of the case is the same as the specific example when R2 and R3 are groups having a low electron donating property.
In particular, at least one of R5 and R6 is preferably a methyl group or an ethyl group, and it is more preferable that at least one is a methyl group and only one is a methyl group because the effect of the present invention is more excellent. Is particularly preferable.

Specific examples of the second dichroic substance are shown below, but the present invention is not limited thereto.

Third dichroic substance The third dichroic substance is a dichroic substance having a maximum absorption wavelength in the range of 380 nm or more and less than 455 nm (preferably 385 to 454 nm).
Specific examples of the third dichroic substance include the above-mentioned first dichroic substance and the above-mentioned first among the compounds including the compound represented by the formula (1) described in International Publication No. 2017/195833. Examples thereof include compounds other than the dichroic substance of 2.

The molar content of the radically polymerizable group in the liquid crystal composition is preferably 0.5 mmol / g or more, more preferably 1.0 mmol / g or more, and 1.5 mmol / g with respect to the total solid content of the liquid crystal composition. The above is more preferable. When the molar content is 1.0 mmol / g or more, the effect of the present invention is more excellent because the deformation of the film is suppressed.
The upper limit of the molar content is not particularly limited, but is often used at 3.0 mmol / g or less.
Here, the molar content of the radically polymerizable groups means the ratio of the total molar amount (mol) of the radically polymerizable groups contained in the liquid crystal composition to 1 g of the solid content of the liquid crystal composition. It can be calculated from the content (mass%), molecular weight and chemical structure of the compound having a radically polymerizable group contained in the liquid crystal composition.
Specific examples of the radically polymerizable group include a vinyl group, a butadiene group, a (meth) acryloyloxy group, a (meth) acrylamide group, a vinyl acetate group, a fumaric acid ester group, a styryl group, a vinylpyrrolidone group, and a maleic anhydride. , And a maleimide group and the like. The radically polymerizable group is preferably contained in at least one of the above-mentioned liquid crystal compound and dichroic substance.

<Solvent>
The liquid crystal composition preferably contains a solvent from the viewpoint of workability and the like.
Examples of the solvent include ketones (eg, acetone, 2-butanone, methylisobutylketone, cyclopetantanone, cyclohexanone, etc.), ethers (eg, dioxane, tetrahydrofuran, 2-methyltetrahexyl, cyclopentylmethyl ether, tetrahydropyran, etc.). Dioxolanes, etc.), aliphatic hydrocarbons (eg, hexane, etc.), alicyclic hydrocarbons (eg, cyclohexane, etc.), aromatic hydrocarbons (eg, benzene, toluene, xylene, trimethylbenzene, etc.), halogenated Carbons (eg, dichloromethane, trichloromethane, dichloroethane, dichlorobenzene, chlorotoluene, etc.), esters (eg, methyl acetate, ethyl acetate, butyl acetate, ethyl lactate, etc.), alcohols (eg, ethanol, isopropanol, butanol, etc.) Cyclohexanols, isopentyl alcohols, neopentyl alcohols, diacetone alcohols, benzyl alcohols, etc.), cellosolves (eg, methylserosolves, ethylserosolves, 1,2-dimethoxyethane, etc.), cellosolve acetates, sulfoxides (eg, dimethyl). Examples include organic solvents such as sulfoxides), amides (eg, dimethylformamide, dimethylacetamide, N-methylpyrrolidone, N-ethylpyrrolidone, etc.), and heterocyclic compounds (eg, pyridine, etc.), and water. This solvent may be used alone or in combination of two or more.
Of these solvents, ketones (particularly cyclopentanone and cyclohexanone), ethers (particularly tetrahydrofuran, cyclopentylmethyl ether, tetrahydropyran, dioxolan), and amides (particularly) are used from the viewpoint of taking advantage of their excellent solubility. , Dimethylformamide, dimethylacetamide, N-methylpyrrolidone, N-ethylpyrrolidone) are preferred.
When the liquid crystal composition contains a solvent, the content of the solvent is preferably 70 to 99.5% by mass, preferably 80 to 99.5% by mass, based on the total mass of the liquid crystal composition, for the reason that the effect of the present invention is more excellent. It is more preferably ~ 99% by mass, and particularly preferably 85 to 98% by mass.

<Interface improver>
The liquid crystal composition preferably contains a surfactant (surfactant). By including the interface improver, the smoothness of the coated surface is improved, the degree of orientation is improved, repelling and unevenness are suppressed, and the in-plane uniformity is expected to be improved.
As the interface improver, a liquid crystal compound that is horizontally oriented is preferable, and the compound (horizontal alignment agent) described in paragraphs [0253] to [0293] of JP-A-2011-237513 can be used. Further, the fluorine (meth) acrylate-based polymers described in [0018] to [0043] of JP-A-2007-272185 can also be used. As the interface improver, compounds other than these may be used.
When the liquid crystal composition contains an interface improver, the content of the interface improver in the liquid crystal composition is preferably 0.1 to 2.0% by mass, based on the total solid content of the liquid crystal composition. 1 to 1.0% by mass is more preferable.
When the light absorption anisotropic layer contains an interface improver, the content of the interface improver with respect to the total mass of the light absorption anisotropic layer is the same as the content of the interface improver with respect to the total solid content of the liquid crystal composition. Is preferable.

<Polymerization initiator>
The liquid crystal composition preferably contains a polymerization initiator because the effect of the present invention is more excellent.
The polymerization initiator 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 particular limitation. Examples of photopolymerization initiators include α-carbonyl compounds (US Pat. Nos. 2,376,661 and 236,670), acidoin ethers (US Pat. No. 2,448,828), and α-hydrogen-substituted aromatic acyloins. Compounds (US Pat. No. 2722512), polynuclear quinone compounds (US Pat. Nos. 3,416127 and 2951758), combinations of triarylimidazole dimers with p-aminophenylketone (US Pat. No. 3,549,677). , Acridin and phenazine compounds (Japanese Patent Laid-Open No. 60-105667 and US Pat. No. 4,239,850), oxadiazole compounds (US Pat. No. 421,970), o-acyloxime compounds (Japanese Patent Laid-Open No. 2016-). 27384 [0065]), acylphosphine oxide compounds (Japanese Patent Laid-Open No. 63-40799, Japanese Patent Application Laid-Open No. 5-29234, Japanese Patent Application Laid-Open No. 10-95788, Japanese Patent Application Laid-Open No. 10-29997) and the like. Can be mentioned.
As such a photopolymerization initiator, commercially available products can also be used, and examples thereof include Irgacure 184, Irgacure 907, Irgacure 369, Irgacure 651, Irgacure 819 and Irgacure OXE-01 manufactured by BASF.
When the liquid crystal composition contains a polymerization initiator, the content of the polymerization initiator is preferably 0.1 to 6% by mass with respect to the total solid content of the liquid crystal composition, for the reason that the effect of the present invention is more excellent. , 0.5-4% by mass, more preferably.

<Method of forming a light absorption anisotropic layer>
The method for forming the light absorption anisotropic layer using the liquid crystal composition described above is not particularly limited, and for example, the liquid crystal composition is applied onto an alignment film (for example, a light alignment film described later) to form a coating film. (Hereinafter, also referred to as “coating film forming step”) and a step of orienting the liquid crystal component contained in the coating film (hereinafter, also referred to as “orientation step”) can be mentioned in this order. ..

(Coating film forming process)
The coating film forming step is a step of applying the liquid crystal composition on the alignment film to form a coating film.
It is easy to apply the liquid crystal composition on the alignment film by using the liquid crystal composition containing the above-mentioned solvent or by using a liquid crystal composition such as a molten liquid by heating or the like. Become.
Specific examples of the method for applying the liquid crystal composition include a roll coating method, a gravure printing method, a spin coating method, a wire bar coating method, an extrusion coating method, a direct gravure coating method, a reverse gravure coating method, and a die coating method. , A spray method, and a known method such as an inkjet method.

(Orientation process)
The alignment step is a step of aligning the liquid crystal component contained in the coating film. As a result, a light absorption anisotropic layer is obtained.
The liquid crystal component is a component that includes not only the liquid crystal compound described above but also the dichroic substance having a liquid crystal property when the dichroic substance described above has a liquid crystal property.
The alignment step may have a drying process. By the drying treatment, components such as a solvent can be removed from the coating film. The drying treatment may be carried out by a method of leaving the coating film at room temperature for a predetermined time (for example, natural drying), or by a method of heating and / or blowing air.
Here, the liquid crystal component contained in the liquid crystal composition may be oriented by the above-mentioned coating film forming step or drying treatment. 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 to have a light absorption anisotropy (that is, light absorption). Anisotropic layer) is obtained.
When the drying treatment is performed at a temperature equal to or higher than the transition temperature of the liquid crystal component contained in the coating film to the liquid crystal phase, the heat treatment described later may not be performed.

The transition temperature of the liquid crystal component 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 manufacturing suitability and the like. When the transition temperature is 10 ° C. or higher, a cooling treatment or the like for lowering the temperature to a temperature range exhibiting a liquid crystal phase is not required, which is preferable. Further, when the transition temperature is 250 ° C. or lower, a high temperature is not required even when the isotropic liquid state is once higher than the temperature range in which the liquid crystal phase is exhibited, which wastes heat energy and causes the substrate. It is preferable because it can reduce deformation and deterioration.

The orientation step preferably has a heat treatment. As a result, the liquid crystal component contained in the coating film can be oriented, so that the coating film after the heat treatment can be suitably used as the light absorption anisotropic layer.
The heat treatment is preferably 10 to 250 ° C., more preferably 25 to 190 ° C. from the viewpoint of manufacturing suitability and the like. The heating time is preferably 1 to 300 seconds, more preferably 1 to 60 seconds.

The alignment step may have a cooling treatment performed after the heat treatment. The cooling treatment is a treatment for cooling the heated coating film to about room temperature (20 to 25 ° C.). Thereby, the orientation of the liquid crystal component contained in the coating film can be fixed. The cooling means is not particularly limited, and can be carried out by a known method.
By the above steps, a light absorption anisotropic layer can be obtained.
In this embodiment, drying treatment, heat treatment, and the like are mentioned as methods for orienting the liquid crystal component contained in the coating film, but the method is not limited to this, and can be carried out by a known orientation treatment.

(Other processes)
The method for forming the light absorption anisotropic layer may include a step of curing the light absorption anisotropic layer (hereinafter, also referred to as “curing step”) after the alignment step.
The curing step is carried out, for example, by heating and / or light irradiation (exposure) when the light absorption anisotropic layer has a crosslinkable group (polymerizable group). Among these, it is preferable that the curing step is carried out by light irradiation.
When the photo-alignment layer contains a compound having a photoreactive radical polymerizable group, exposure is performed by a method in which the radical polymerization initiator is not contained in the photo-orientation layer or in an environment having a high oxygen concentration. An unreactive radical polymerizable group can be left on the surface of the photoalignment layer by a method or the like. By reacting the unreacted radically polymerizable group existing on the surface of the photoaligned layer with the radically polymerizable group of the light absorption anisotropic layer in the "curing step", the photoaligned layer and the light absorption anisotropic layer are reacted. It is possible to improve the adhesion with the layer.
As the light source used for curing, various light sources such as infrared rays, visible light, and ultraviolet rays can be used, but ultraviolet rays are preferable. Further, the ultraviolet rays may be irradiated while being heated at the time of curing, or the ultraviolet rays may be irradiated through a filter that transmits only a specific wavelength.
When the exposure is carried out while heating, the heating temperature at the time of exposure is preferably 25 to 140 ° C., although it depends on the transition temperature of the liquid crystal component contained in the light absorption anisotropic layer to the liquid crystal phase.
Further, the exposure may be performed in a nitrogen atmosphere. When the curing of the light absorption anisotropic layer proceeds by radical polymerization, the inhibition of polymerization by oxygen is reduced, so that exposure in a nitrogen atmosphere is preferable.

From the viewpoint of flexibility, the thickness of the light absorption anisotropic layer is preferably less than 10 μm, more preferably less than 5 μm, still more preferably less than 3 μm, and most preferably less than 2 μm.
The lower limit of the thickness of the light absorption anisotropic layer is preferably 0.1 μm or more, more preferably 0.3 μm or more.

From the viewpoint of antireflection, the visible light average transmittance of the light absorption anisotropic layer is preferably 60% or less, more preferably 50% or less, still more preferably 43% or less. The upper limit of the visible light average transmittance is 100%.
Further, the visible light average transmittance of the light absorption anisotropic layer is preferably 45% or more from the viewpoint of improving the brightness.
In the present invention, the visible light average transmittance means an arithmetic average value of the transmittance in increments of 5 nm in the visible light region (wavelength 400 nm to 700 nm). A spectrophotometer (for example, a multi-channel spectroscope (manufactured by OCEAN OPTICS, product name "QE65000")) is used for measuring the transmittance.

[Alignment film]
The optical element of the present invention may have an alignment film.
Here, the alignment film may be any layer as long as the dichroic substance contained in the liquid crystal composition can be in a desired orientation state on the alignment film.
Examples of the method for forming the alignment film include rubbing treatment of an organic compound (preferably a polymer) on the film surface, oblique vapor deposition of an inorganic compound, formation of a layer having microgrooves, and a Langmuir-Blojet method (LB film). ) To accumulate organic compounds (eg, ω-tricosanoic acid, dioctadecylmethylammonium chloride, methyl stearylate, etc.). Further, an alignment film in which an alignment function is generated by applying an electric field, applying a magnetic field, or irradiating light is also known.
Among them, in the present invention, the alignment film formed by the rubbing treatment is preferable from the viewpoint of easy control of the pretilt angle of the alignment film, and the photo-alignment film formed by light irradiation is also preferable from the viewpoint of the uniformity of orientation.

<Rubbing treatment alignment film>
The polymer material used for the alignment film formed by the rubbing treatment has been described in a large number of documents, and a large number of commercially available products can be obtained. In the present invention, polyvinyl alcohol or polyimide and its derivatives are preferably used. For the alignment film, the description on page 43, lines 24 to 49, line 8 of International Publication No. 2001/88574A1 can be referred to. The thickness of the alignment film is preferably 0.01 to 10 μm, more preferably 0.01 to 2 μm.

<Photo-alignment film>
The photo-alignment compound used for the alignment film formed by light irradiation is described in many documents and the like. In the present invention, for example, JP-A-2006-285197, JP-A-2007-76839, JP-A-2007-138138, JP-A-2007-94071, JP-A-2007-121721, JP-A-2007. Azo compounds described in JP-A-140465, JP-A-2007-156439, JP-A-2007-133184, JP-A-2009-109831, Patent No. 3883848, Patent No. 4151746, JP-A-2002-229039. Aromatic ester compounds described in JP-A, JP-A-2002-265541, Maleimide and / or alkenyl-substituted nadiimide compounds having photoorientation units described in JP-A-2002-317013, Japanese Patent No. 4205195, Japanese Patent No. 4205198. Preferred examples thereof include the photobridgeable silane derivative described in No. 2003-520878, JP-A-2004-522220, or the photocrosslinkable polyimide, polyamide or ester described in Japanese Patent No. 4162850. More preferably, it is an azo compound, a photocrosslinkable polyimide, a polyamide, or an ester.

Of these, as the photoalignment compound, it is preferable to use a photosensitive compound having a photoreactive group in which at least one of dimerization and isomerization is generated by the action of light.
Examples of the photoreactive group include a group having a cinnamoyl structure (skeleton), a group having a coumarin structure (skeleton), a group having a chalcone structure (skeleton), and a group having a benzophenone structure (skeleton). , And a group having an anthracene structure (skeleton). Among these groups, a group having a cinnamoyle structure and a group having a coumarin structure are preferable, and a group having a cinnamoyle structure is more preferable.

Further, the photosensitive compound having a photo-oriented group may further have a cross-linking group.
As the crosslinkable group, a heat-crosslinkable group that causes a curing reaction by the action of heat and a photocrosslinkable group that causes a curing reaction by the action of light are preferable, and both the crosslinkable group and the crosslinkable group have a photocrosslinkable group. It may be a group.
Examples of the crosslinkable group include an epoxy group, an oxetanyl group, a group represented by -NH-CH ₂ -OR (R represents a hydrogen atom or an alkyl group having 1 to 20 carbon atoms), and an ethylenic group. At least one selected from the group consisting of a group having an unsaturated double bond and a blocked isocyanate group can be mentioned. Of these, an epoxy group, an oxetanyl group, and a group having an ethylenically unsaturated double bond are preferable.
The cyclic ether group of the 3-membered ring is also called an epoxy group, and the cyclic ether group of the 4-membered ring is also called an oxetanyl group.
Specific examples of the group having an ethylenically unsaturated double bond include a vinyl group, an allyl group, a styryl group, an acryloyl group, and a methacryloyl group, and an acryloyl group or a methacryloyl group is preferable. ..

A photo-alignment film formed from the above material is irradiated with linearly polarized light or non-polarized light to produce a photo-alignment film.
In the present specification, "linearly polarized light irradiation" and "non-polarized light irradiation" are operations for causing a photoreaction in a photo-aligned material. The wavelength of the light used varies depending on the photoalignment material used, and is not particularly limited as long as it is a wavelength required for the photoreaction. The peak wavelength of the light used for light irradiation is preferably 200 nm to 700 nm, and more preferably ultraviolet light having a peak wavelength of 400 nm or less.

Light sources used for light irradiation include commonly used light sources such as tungsten lamps, halogen lamps, xenon lamps, xenon flash lamps, mercury lamps, mercury xenon lamps and carbon arc lamps, and various lasers [eg, semiconductor lasers, heliums]. Neon lasers, argon ion lasers, helium cadmium lasers and YAG (itrium aluminum garnet) lasers], light emitting diodes, and cathode wire tubes can be mentioned.

As a means for obtaining linearly polarized light, a method using a polarizing plate (for example, an iodine polarizing plate, a two-color dye polarizing plate, and a wire grid polarizing plate), a prism-based element (for example, a Gran Thomson prism), or a Brewster angle is used. A method using a polarized reflector or a method using light emitted from a polarized laser light source can be adopted. Further, only light having a required wavelength may be selectively irradiated by using a filter, a wavelength conversion element, or the like.

In the case of linearly polarized light, a method of irradiating the light from the upper surface or the back surface of the alignment film perpendicularly or diagonally to the surface of the alignment film is adopted. The incident angle of light varies depending on the photoalignment material, but is preferably 0 to 90 ° (vertical), preferably 40 to 90 °.
In the case of non-polarized light, the alignment film is irradiated with non-polarized light from an angle. The incident angle is preferably 10 to 80 °, more preferably 20 to 60 °, and even more preferably 30 to 50 °.
The irradiation time is preferably 1 minute to 60 minutes, more preferably 1 minute to 10 minutes.

When patterning is required, a method of applying light irradiation using a photomask as many times as necessary for pattern production, or a method of writing a pattern by laser light scanning can be adopted.

[Optically anisotropic layer]
The optical element of the present invention preferably has an optically anisotropic layer containing a liquid crystal compound (however, excluding the above-mentioned light absorption anisotropic layer).

The optically anisotropic layer is not particularly limited as long as it is a layer having optical anisotropy, but is preferably a retardation layer because the effect of the present invention is more excellent, and exhibits an antireflection function as a circularly polarizing plate. It is more preferable to use a λ / 4 plate from the viewpoint of being able to do so.
Here, the "λ / 4 plate" is a plate having a λ / 4 function, and specifically, a function of converting linearly polarized light having a specific wavelength into circularly polarized light (or converting circularly polarized light into linearly polarized light). It is a plate having.
Specific examples of the λ / 4 plate include, for example, US Patent Application Publication No. 2015/0277006.
For example, examples of the embodiment in which the λ / 4 plate has a single-layer structure include a stretched polymer film and a retardation film in which an optically anisotropic layer having a λ / 4 function is provided on a support. Further, as an embodiment in which the λ / 4 plate has a multi-layer structure, specifically, a wide band λ / 4 plate formed by laminating a λ / 4 plate and a λ / 2 plate can be mentioned.
The λ / 4 plate is preferably formed by applying a liquid crystal composition containing a liquid crystal compound because the effect of the present invention is more excellent.
The retardation film provided with the optically anisotropic layer having a λ / 4 function is a liquid crystal compound (disk-shaped liquid crystal, rod-shaped liquid crystal compound, etc.) formed by polymerizing a liquid crystal monomer expressing a nematic liquid crystal layer or a smectic liquid crystal layer. ), It is more preferable that the retardation film has one or more layers.
Further, it is further preferable to use a liquid crystal compound having a reverse wavelength dispersibility as the λ / 4 plate having excellent optical performance. Specifically, the liquid crystal compound of the general formula (II) described in International Publication No. 2017/043438 is preferably used. Regarding the method for producing a λ / 4 plate using a liquid crystal compound having a reverse wavelength dispersibility, refer to the description of Examples 1 to 10 of International Publication No. 2017/043438 and Example 1 of JP-A-2016-91022. can.

The thickness of the optically anisotropic layer (particularly, λ / 4 plate) is not particularly limited, but is preferably 0.1 to 100 μm, preferably 0.5 to 5 μm, for the reason that the effect of the present invention is more excellent. Is more preferable.

[Barrier layer]
When the optical element of the present invention has a refractive index adjusting layer described later, it is preferable to have a barrier layer.
Here, the barrier layer is also referred to as a gas blocking layer (oxygen blocking layer), and has a function of protecting the polarizing element of the present invention from gas such as oxygen in the atmosphere, moisture, or a compound contained in an adjacent layer. Have. It is also one of the preferable embodiments that the dye A used in the present invention is contained in this layer.
Regarding the barrier layer, for example, paragraphs [0014] to [0054] of JP-A-2014-159124, paragraphs [0042]-[0075] of JP-A-2017-121721, and paragraphs [0042]-[0075] of JP-A-2017-121507, 0045] to [0054], paragraphs [0010] to [0061] of JP2012-213938A, and paragraphs [0021] to [0031] of JP2005-169994 can be referred to.

Specific examples of the oxygen blocking layer include polyvinyl alcohol-based resin, polyethylene vinyl alcohol-based resin, polyvinyl ether, polyvinyl pyrrolidone, polyacrylamide, polyacrylic acid, cellulose ether, polyamide, polyimide, styrene / maleic acid copolymer, gelatin, and the like. Examples include a layer containing vinylidene chloride and an organic compound such as cellulose nanofibers.
Of these, a layer containing a polyvinyl alcohol-based resin or a polyethylene vinyl alcohol-based resin is preferable, and a layer containing a polyvinyl alcohol-based resin is particularly preferable because of its high oxygen blocking ability.
In the present specification, the oxygen blocking function is not limited to a state in which oxygen does not pass at all, but also includes a state in which oxygen slightly passes depending on the desired performance.

Examples of the polymerizable compound having a high oxygen blocking function include a polymerizable compound having a high hydrogen bond property and a compound having many polymerizable groups per molecular weight. Examples of the compound having many polymerizable groups per molecular weight include pentaerythritol tetra (meth) acrylate and dipentaerythritol hexa (meth) acrylate.

Specific examples of the polymerizable compound having high hydrogen bonding properties include compounds represented by the following formulas, and among them, 3', 4'-epoxycyclohexylmethyl-3,4 represented by CEL2021P below. -Epoxy cyclohexane carboxylate is preferred.

Further, a thin layer made of a metal compound (metal compound thin layer) can also be mentioned. As the method for forming the thin layer of the metal compound, any method can be used as long as it can form the desired thin layer. For example, a sputtering method, a vacuum deposition method, an ion plating method, a plasma CVD (Chemical Vapor Deposition) method and the like are suitable, and specifically, Patent No. 3400324, JP-A-2002-322561, JP-A-2002-. The forming method described in each of the publications of No. 361774 can be adopted.

The barrier layer may have the function of the following refractive index adjusting layer. Conversely, the following refractive index adjusting layer may have the function of a barrier layer. In this case, the barrier layer and the refractive index adjusting layer are one layer, and both functions can be combined, which is very preferable.

[Refractive index adjustment layer]
The optical element of the present invention may have the refractive index adjusting layer described below. The refractive index adjusting layer is a layer arranged so as to be in contact with the light absorption anisotropic layer. From the viewpoint of film strength, it is preferably formed from a composition containing a compound having a crosslinkable group. It is preferable that it is a refractive index adjusting layer for performing so-called index matching.
As described above, the refractive index adjusting layer may have the function of a barrier layer. In that case, it can be regarded as the barrier layer used in the present invention.

The in-plane average refractive index of the refractive index adjusting layer at a wavelength of 550 nm is preferably 1.5 to 1.7, more preferably 1.50 to 1.60.

The thickness of the refractive index adjusting layer is not particularly limited, but is preferably 0.01 to 2.00 μm, more preferably 0.01 to 0.80 μm, and even more preferably 0.01 to 0.15 μm from the viewpoint of thinning. However, when it has the function of a barrier layer, it is preferably 0.1 to 3 μm, more preferably 0.5 to 1.5 μm.

The type of the component constituting the refractive index adjusting layer is not particularly limited.
If there is a crosslinkable group, the strength in the layer can be secured.
Compounds that cure with light or heat, such as polymerizable compounds having a (meth) acryloyl group or an epoxy group, are preferred.
Further, a polymerizable liquid crystal compound is also preferable in that a high in-plane average refractive index can be obtained. Further, the polymerizable liquid crystal compound has a high potential for optimizing the refractive index with the light absorption anisotropic layer having the in-plane refractive index anisotropy in that the anisotropy of the refractive index can be controlled in the plane.

It is a preferable example corresponding to the third aspect of the present invention that the dye A used in the present invention is added to the polymerizable liquid crystal compound and oriented and used.

The refractive index adjusting layer may contain particles together with a compound having a crosslinkable group. Examples of the particles include organic particles, inorganic particles, and organic-inorganic composite particles containing organic components and inorganic components.
The organic particles include styrene resin particles, styrene-divinylbenzene copolymer particles, acrylic resin particles, methacrylic resin particles, styrene-acrylic copolymer particles, styrene-methacrylic copolymer particles, melamine resin particles, and two types thereof. Examples thereof include resin particles containing the above.
Examples of the components constituting the inorganic particles include metal oxides, metal nitrides, metal oxynitrides, and simple substances of metals. Examples of the metal atom contained in the metal oxide, the metal nitride, the metal oxynitride, and the single metal include a titanium atom, a silicon atom, an aluminum atom, a cobalt atom, and a zirconium atom. Specific examples of the inorganic particles include alumina particles, alumina hydrate particles, silica particles, zirconia particles, and inorganic oxide particles such as clay minerals (for example, smectite). Zirconia particles are preferred because they provide a high refractive index.

The average particle size of the particles is preferably 1 to 300 nm, more preferably 10 to 200 nm.
Within the above range, a cured product (transparent resin layer) having excellent particle dispersibility and excellent high temperature durability, wet heat durability and transparency can be obtained.
Here, the average particle size of the particles can be obtained from photographs obtained by observation with a TEM (transmission electron microscope) or SEM (scanning electron microscope). Specifically, the projected area of the particles is obtained, and the corresponding circle-equivalent diameter (diameter of the circle) is defined as the average particle diameter of the particles. The average particle size in the present invention is an arithmetic mean value of the equivalent circle diameter obtained for 100 particles. The particles may have any shape such as spherical, needle-shaped, fiber-shaped, columnar and plate-shaped.
The content of particles in the refractive index adjusting layer is not particularly limited, but 1 to 50% by mass is preferable with respect to the total mass of the refractive index adjusting layer in that the in-plane average refractive index of the refractive index adjusting layer can be easily adjusted. , 1 to 30% by mass is more preferable.

The method for forming the refractive index adjusting layer is not particularly limited, and examples thereof include a method in which a composition for forming a refractive index adjusting layer is applied onto a polarizing element and a coating film is cured, if necessary.
The composition for forming the refractive index adjusting layer contains components that can form the refractive index adjusting layer, and examples thereof include resins, monomers, and particles. Examples of resins and particles are as described above.
Examples of the monomer include a photocurable compound and a thermosetting compound (for example, a thermosetting resin). As the monomer, a monofunctional polymerizable compound containing one polymerizable group in one molecule and a polyfunctional polymerizable compound containing two or more of the same or different polymerizable groups in one molecule are preferable. The polymerizable compound may be a monomer or a multimer such as an oligomer or a polymer.
Examples of the polymerizable group include a radically polymerizable group and a cationically polymerizable group, and a radically polymerizable group is preferable. Examples of the radically polymerizable group include an ethylenically unsaturated bond group. Examples of the cationically polymerizable group include an epoxy group and an oxetane group.

The composition for forming a refractive index adjusting layer may contain at least one of a surface improver, a polymerization initiator, and a solvent. Examples of these components include compounds exemplified as components that may be contained in the liquid crystal composition.

The method for applying the composition for forming the refractive index adjusting layer is not particularly limited, and examples thereof include the above-mentioned method for applying the liquid crystal composition.

After applying the composition for forming the refractive index adjusting layer, the coating film may be subjected to a drying treatment, if necessary.
When the composition for forming a refractive index adjusting layer contains a curable compound such as a monomer, the coating film may be cured after the composition for forming the refractive index adjusting layer is applied.
Examples of the curing treatment include a photo-curing treatment and a thermosetting treatment, and the optimum conditions are selected according to the material used.

When a polymerizable liquid crystal compound is used, the compound is not particularly limited.
Generally, liquid crystal compounds can be classified into rod-shaped type and disk-shaped type according to their shape. Furthermore, there are low molecular weight and high molecular weight types, respectively. A polymer generally refers to a molecule having a degree of polymerization of 100 or more (Polymer Physics / Phase Transition Dynamics, Masao Doi, p. 2, Iwanami Shoten, 1992).
In the present invention, any liquid crystal compound can be used, but a rod-shaped liquid crystal compound (hereinafter, also abbreviated as “CLC”) or a discotic liquid crystal compound (hereinafter, also abbreviated as “DLC”) is used. Is preferable, and it is more preferable to use a rod-shaped liquid crystal compound. Two or more kinds of rod-shaped liquid crystal compounds, two or more kinds of disc-shaped liquid crystal compounds, or a mixture of a rod-shaped liquid crystal compound and a disk-shaped liquid crystal compound may be used.

In the present invention, it is necessary to use a liquid crystal compound having a polymerizable group for immobilization of the above-mentioned liquid crystal compound, and the liquid crystal compound may have two or more polymerizable groups in one molecule. More preferred. When the liquid crystal compound is a mixture of two or more kinds, it is preferable that at least one kind of liquid crystal compound has two or more polymerizable groups in one molecule. After the liquid crystal compound is fixed by polymerization, it is no longer necessary to exhibit liquid crystal property.

The type of the polymerizable group is not particularly limited, and a functional group capable of an addition polymerization reaction is preferable, and a polymerizable ethylenically unsaturated group or a ring-polymerizable group is preferable. More specifically, a (meth) acryloyl group, a vinyl group, a styryl group, an allyl group and the like are preferably mentioned, and a (meth) acryloyl group is more preferable. The (meth) acryloyl group is a notation meaning a meta-acryloyl group or an acryloyl group.

As the rod-shaped liquid crystal compound, for example, those described in claim 1 of JP-A No. 11-513019 and paragraphs [0026] to [0098] of JP-A-2005-289980 can be preferably used, and disco As the tick liquid crystal compound, for example, those described in paragraphs [0020] to [0067] of JP-A-2007-108732 and paragraphs [0013] to [0108] of JP-A-2010-244033 are preferably used. However, it is not limited to these.

<Other ingredients>
Specific examples of the other components contained in the composition for forming a refractive index adjusting layer include the above-mentioned composition containing a dichroic azo dye compound (composition for forming a light absorption anisotropic layer). Examples thereof include the polymerization initiators, surfactants and solvents described above.

<Formation method>
The method for forming the refractive index adjusting layer using the above-mentioned composition for forming the refractive index adjusting layer is not particularly limited, and the above-mentioned composition for forming the refractive index adjusting layer is subjected to the alignment film described later or the above-mentioned light depending on the layer structure. A step of applying on the absorption anisotropic layer to form a coating film (hereinafter, also referred to as a "coating film forming step") and a step of orienting a liquid crystal component contained in the coating film (hereinafter, "alignment step"). Also referred to as), and a method of including in this order can be mentioned.
Here, as the coating film forming step and the alignment step, the same steps as those described in the above-mentioned method for forming the light absorption anisotropic layer can be mentioned.

[Adhesive layer]
The optical element of the present invention may have an adhesive layer on the surface to which the λ / 4 plate is bonded from the viewpoint of bonding the above-mentioned λ / 4 plate.

Examples of the adhesive contained in the adhesive layer include a rubber adhesive, an acrylic adhesive, a silicone adhesive, a urethane adhesive, a vinyl alkyl ether adhesive, a polyvinyl alcohol adhesive, and a polyvinylpyrrolidone adhesive. , Polyacrylamide-based adhesives, cellulose-based adhesives and the like.
Of these, an acrylic pressure-sensitive adhesive (pressure-sensitive pressure-sensitive adhesive) is preferable from the viewpoint of transparency, weather resistance, heat resistance, and the like.

The pressure-sensitive adhesive layer is, for example, a method in which a solution of a pressure-sensitive adhesive is applied on a release sheet, dried, and then transferred to the surface of the transparent resin layer; the solution of the pressure-sensitive adhesive is directly applied to the surface of the transparent resin layer and dried. It can be formed by a method of making it; etc.
The pressure-sensitive adhesive solution is prepared as a solution of about 10 to 40% by mass in which the pressure-sensitive adhesive is dissolved or dispersed in a solvent such as toluene or ethyl acetate.
As the coating method, a roll coating method such as reverse coating and gravure coating, a spin coating method, a screen coating method, a fountain coating method, a dipping method, a spray method and the like can be adopted.

As the constituent material of the release sheet, for example, a synthetic resin film such as polyethylene, polypropylene, polyethylene terephthalate; a rubber sheet; paper; cloth; a non-woven fabric; a net; a foam sheet; a metal foil; an appropriate thin leaf body or the like can be used. Can be mentioned.

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

[Adhesive layer]
The adhesive in the present invention develops adhesiveness by drying and reaction after bonding.
The polyvinyl alcohol-based adhesive (PVA-based adhesive) develops adhesiveness when dried, and makes it possible to bond materials to each other.
Specific examples of the curable adhesive that develops adhesiveness by reaction include active energy ray-curable adhesives such as (meth) acrylate-based adhesives and cationic polymerization curable adhesives. The (meth) acrylate means acrylate and / or methacrylate. Examples of the curable component in the (meth) acrylate-based adhesive include a compound having a (meth) acryloyl group and a compound having a vinyl group.
Further, as the cationic polymerization curable adhesive, a compound having an epoxy group or an oxetanyl group can also be used. The compound having an epoxy group is not particularly limited as long as it has at least two epoxy groups in the molecule, and various generally known curable epoxy compounds can be used. Preferred epoxy compounds include compounds having at least two epoxy groups and at least one aromatic ring in the molecule (aromatic epoxy compounds) and at least one of them having at least two epoxy groups in the molecule. Examples thereof include a compound (alicyclic epoxy compound) formed between two adjacent carbon atoms constituting an alicyclic ring.

[Protective layer]
The optical element of the present invention preferably has a protective layer from the viewpoint of improving the durability of the light absorption anisotropic layer.
The protective layer may be a layer made of a known material, but a resin film is preferable. Examples of the resin film include an acrylic resin film, a cellulose ester resin film, a polyethylene terephthalate resin film, a polycarbonate resin film, and the like.

[UV (ultraviolet) absorbing layer]
The optical element of the present invention preferably has a functional layer (UV absorption layer) having a function of reducing short-wave light on the surface protective layer side of the light absorption anisotropic layer. By reducing short-wave light, it is possible to suppress photodecomposition of dichroic substances and provide optical elements with excellent light resistance.
When the oxygen blocking layer is arranged on the side opposite to the light absorption anisotropic layer of the first adhesive layer, the oxygen blocking layer corresponds to the surface protective layer.
As one aspect, it is preferable that the above-mentioned adhesive layer or oxygen blocking layer has a function of reducing short wave light.
As another aspect, it is also preferable to newly provide a layer having a function of reducing shortwave light on the visible side of the light absorption anisotropic layer.

The method for reducing short-wave light is not particularly limited, and a method using light absorption by an absorbent or the like and a method using wavelength selective reflection by a multilayer film are exemplified.

The above-mentioned shortwave light refers to light having a wavelength of 430 nm or less. By reducing the light having a wavelength of 430 nm or less, it is possible to suppress the photodegradation of the dye compound by sunlight or the light source light used in the light resistance test of JIS B 7751 and JIS B 7754.
Further, in order not to affect the performance of the light absorption anisotropic layer in visible light, it is preferable that the light absorption anisotropic layer is transparent in the wavelength range of 450 nm or more.
The UV absorbing layer is preferably a UV absorbing layer having an absorbance of 0.5 or more at a wavelength of 360 nm and a wavelength of 400 nm for the reason that the effect of the present invention is more excellent.

[Display device]
The display device of the present invention has the above-mentioned optical element of the present invention. The display device is preferably an image display device capable of displaying an image of characters or figures.
Further, in the display device of the present invention, it is preferable that the dye A contained in the optical element is contained in a layer located on the visual recognition side of the light absorption anisotropic layer of the optical element.
The display element used in the display device of the present invention is not particularly limited, and examples thereof include a liquid crystal cell, an organic electroluminescence display panel, and a plasma display panel.
Of these, a liquid crystal cell or an organic EL display panel is preferable, and an organic EL display panel is more preferable. That is, the display device of the present invention is preferably a liquid crystal display device using a liquid crystal cell as a display element, and an organic EL display device using an organic EL display panel as a display element, and the organic EL display device is preferable. More preferred.

[Liquid crystal display device]
The liquid crystal display device which is an example of the display device of the present invention is a liquid crystal display device having the above-mentioned optical element of the present invention (however, the λ / 4 plate is not included) and a liquid crystal cell.
In the present invention, among the optical elements provided on both sides of the liquid crystal cell, it is preferable to use the optical element of the present invention as the polarizing element on the front side (visual recognition side), and the present invention is used as the polarizing element on the front side and the rear side. It is more preferable to use the optical element of the invention.
The liquid crystal cells constituting the liquid crystal display device will be described in detail below.

<LCD cell>
The liquid crystal cell used in the liquid crystal display device is preferably a VA (Vertical Alignment) mode, an OCB (Optically Compensated Bend) mode, an IPS (In-Plane-Switching) mode, or a TN (Twisted Nematic) mode. It is not limited to these.
In the liquid crystal cell in the TN mode, the rod-shaped liquid crystal molecules (rod-shaped liquid crystal compounds) are substantially horizontally oriented when no voltage is applied, and are further twisted to 60 to 120 °. The TN mode liquid crystal cell is most often used as a color TFT liquid crystal display device, and has been described in many documents.
In the VA mode liquid crystal cell, the rod-shaped liquid crystal molecules are substantially vertically oriented when no voltage is applied. In the VA mode liquid crystal cell, (1) a VA mode liquid crystal cell in a narrow sense (1) in which rod-shaped liquid crystal molecules are oriented substantially vertically when no voltage is applied and substantially horizontally when a voltage is applied (Japanese Patent Laid-Open No. 2-). In addition to (described in Japanese Patent Publication No. 176625), (2) a liquid crystal cell (SID97, Digist of technology. Papers (Proceedings) in which the VA mode is multi-domainized (MVA mode (Multi-domine Vertical Alignment)) for expanding the viewing angle. 28 (1997) 845), (3) A mode (n-ASM (Axially symmetric aligned microcell) mode) in which a rod-shaped liquid crystal molecule is substantially vertically oriented when no voltage is applied and twisted and multi-domain oriented when a voltage is applied. Includes liquid crystal cells (described in Proceedings 58-59 (1998) of the Japan Liquid Crystal Conference) and (4) liquid crystal cells in SURVIVAL mode (presented at LCD (liquid crystal display) International 98). Further, it may be any of PVA (Patternized Vertical Alignment) type, optical alignment type (Optical Alignment), and PSA (Polymer-Stained Alignment). Details of these modes are described in Japanese Patent Application Laid-Open No. 2006-215326 and Japanese Patent Application Laid-Open No. 2008-538819.
In the IPS mode liquid crystal cell, the rod-shaped liquid crystal molecules are oriented substantially parallel to the substrate, and the liquid crystal molecules respond in a plane by applying an electric field parallel to the substrate surface. In the IPS mode, black is displayed when no electric field is applied, and the absorption axes of the pair of upper and lower polarizing plates are orthogonal to each other. Methods for using an optical compensation sheet to reduce leakage light when displaying black in an oblique direction and improving the viewing angle are described in JP-A-10-54982, JP-A-11-202323, and JP-A-9-292522. It is disclosed in JP-A-11-133408, JP-A-11-305217, JP-A-10-307291, and the like.

[Organic EL display device]
As an organic EL display device which is an example of the display device of the present invention, for example, from the visual recognition side, the above-mentioned optical element of the present invention (however, including the λ / 4 plate) and the organic EL display panel are arranged in this order. Aspects having in the above are preferably mentioned.
Further, the organic EL display panel is a display panel configured by using an organic EL element formed by sandwiching an organic light emitting layer (organic electroluminescence layer) between electrodes (between a cathode and an anode). The configuration of the organic EL display panel is not particularly limited, and a known configuration is adopted.

Hereinafter, the present invention will be described in more detail based on examples. The materials, amounts used, ratios, treatment contents, treatment procedures, etc. shown in the following examples can be appropriately changed as long as they do not deviate from the gist of the present invention. Therefore, the scope of the present invention should not be construed as limiting by the examples shown below.

[Example 1]
[Making a transparent support]
<Preparation of core layer cellulose acylate dope>
The following composition was put into a mixing tank and stirred to dissolve each component to prepare a cellulose acetate solution to be used as a core layer cellulose acylate dope.
―――――――――――――――――――――――――――――――――
Core layer Cellulose acylate dope ――――――――――――――――――――――――――――――――――
100 parts by mass of cellulose acetate having an acetyl substitution degree of 2.88 ・ 12 parts by mass of the polyester compound B described in Examples of JP-A-2015-227955 ・ 2 parts by mass of the following compound F ・ Methylene chloride (first solvent) 430 Parts by mass / methanol (second solvent) 64 parts by mass ――――――――――――――――――――――――――――――――――

Compound F

<Preparation of outer layer cellulose acylate dope>
10 parts by mass of the following matting agent solution was added to 90 parts by mass of the above-mentioned core layer cellulose acylate dope to prepare a cellulose acetate solution to be used as the outer layer cellulose acylate dope.

―――――――――――――――――――――――――――――――――
Matte 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-The above core layer cellulose acid Rate Dope 1 part by mass ――――――――――――――――――――――――――――――――――

<Preparation of Cellulose Achillate Film 1>
After filtering the core layer cellulose acylate dope and the outer layer cellulose acylate dope with a filter paper having an average pore diameter of 34 μm and a sintered metal filter having an average pore diameter of 10 μm, the core layer cellulose acylate dope and the outer layer cellulose acylate dope on both sides thereof. And three layers were simultaneously spread on a drum at 20 ° C. from the spreading port (band spreading machine).
Then, the film was peeled off with a solvent content of about 20% by mass, both ends of the film in the width direction were fixed with tenter clips, and the film was dried while being stretched laterally at a stretching ratio of 1.1 times.
Then, it was further dried by transporting it between the rolls of the heat treatment apparatus to prepare an optical film (transparent support) having a thickness of 40 μm, which was used as a cellulose acylate film 1.

[Formation of photoalignment film PA1]
The coating liquid PA1 for forming a photoalignment film, which will be described later, was continuously applied onto the cellulose acylate film 1 with a wire bar. The support on which the coating film was formed was dried with warm air at 140 ° C. for 120 seconds, and then the coating film was irradiated with polarized ultraviolet rays (10 mJ / cm ² , using an ultrahigh pressure mercury lamp) to obtain a photoalignment film. PA1 was formed to obtain a TAC (triacetyl cellulose) film with a photoalignment film. The film thickness of the photoalignment film PA1 was 0.5 μm.
―――――――――――――――――――――――――――――――――
Coating liquid PA1 for forming a photoalignment film
―――――――――――――――――――――――――――――――――
-The following polymer PA-1 100.00 parts by mass-The following acid generator PAG-1 8.25 parts by mass-The following stabilizer DIPEA 0.6 parts by mass-Xylene 1126.60 parts by mass-Methyl isobutyl ketone 125.18 Mass part ――――――――――――――――――――――――――――――――――

Polymer PA-1

Acid generator PAG-1

Stabilizer DIPEA

[Preparation of light absorption anisotropic layer P1]
The composition for forming a light absorption anisotropic layer P1 having the following composition was continuously coated on the obtained photoalignment film PA1 with a wire bar of # 20 to form a coating layer P1.
Then, the coating layer P1 was heated at 140 ° C. for 15 seconds, and the coating layer P1 was cooled to room temperature (23 ° C.).
It was then heated at 75 ° C. for 60 seconds and cooled again to room temperature.
Then, by irradiating with an LED lamp (center wavelength 365 nm) for ^{2 seconds under an illuminance of 200 mW / cm 2} , a light absorption anisotropic layer P1 having a thickness of 1.6 μm was produced on the photoalignment film PA1. .. The transmittance of the light absorption anisotropic layer in the wavelength range of 280 nm or more and 780 nm or less was measured by a spectrophotometer, and the visible light average transmittance was 42%.

―――――――――――――――――――――――――――――――――
Composition of composition P1 for forming an anisotropic layer of light absorption ――――――――――――――――――――――――――――――――――
-The following first bicolor substance C-1 (λmax 570 nm) 0.65 parts by mass-The following second bicolor substance M-1 (λmax 466 nm) 0.15 parts by mass-The following third bicolor substance Substance Y-1 (λmax 417 nm) 0.52 parts by mass ・ Dye AVC1 0.40 parts by mass described above ・ Liquid crystal compound L-1 below 2.50 parts by mass ・ Liquid crystal compound L-2 below 1. 50 parts by mass ・ Polymerization initiator IRGACUREOXE-02 (manufactured by BASF) 0.17 parts by mass ・ The following surfactant F-1 0.01 parts by mass ・ Cyclopentanone 46.07 parts by mass ・ tetrahydrofuran 46.07 parts by mass ・Benzyl alcohol 2.36 parts by mass ――――――――――――――――――――――――――――――――――

First dichroic substance C-1

Second dichroic substance M-1

Third dichroic substance Y-1

Liquid crystal compound L-1

Liquid crystal compound L-2

Surfactant F-1

[Formation of barrier layer B1]
The coating liquid B1 having the following composition was continuously coated on the light absorption anisotropic layer P1 with a wire bar. Then, by drying with warm air at 80 ° C. for 5 minutes, the laminate X1 in which the barrier layer B1 made of polyvinyl alcohol (PVA) having a thickness of 1.0 μm was formed, that is, the cellulose acylate film 1 (transparent support). , A laminated body X1 having a light alignment film PA1, a light absorption anisotropic layer P1 and a barrier layer B1 adjacent to each other in this order was obtained.
―――――――――――――――――――――――――――――――――
Composition of coating liquid B1 for forming a barrier layer ――――――――――――――――――――――――――――――――――
・ The following modified polyvinyl alcohol 3.80 parts by mass ・ Initiator Irg2959 0.20 parts by mass ・ 70 parts by mass of water ・ 30 parts by mass of methanol ―――――――――――――――――――― ―――――――――――――

Modified polyvinyl alcohol

[Preparation of TAC film Y1 having a positive A plate]
The coating liquid PA2 for forming a photoalignment film having the following composition was continuously coated on the above-mentioned cellulose acylate film 1 with a wire bar. The support on which the coating film was formed was dried with warm air at 140 ° C. for 120 seconds, and then the coating film was irradiated with polarized ultraviolet rays (10 mJ / cm ² , using an ultrahigh pressure mercury lamp) to 0.2 μm. A photo-alignment film PA2 having a thickness of 1 was formed, and a TAC film with a photo-alignment film was obtained.

―――――――――――――――――――――――――――――――――
Coating liquid PA2 for forming a photoalignment film
―――――――――――――――――――――――――――――――――
-The following polymer PA-2 100.00 parts by mass-The acid generator PAG-1 5.00 parts by mass-The acid generator CPI-110TF 0.005 parts by mass-Isopropyl alcohol 16.50 parts by mass-Butyl acetate 1072 .00 parts by mass, methyl ethyl ketone 268.00 parts by mass ――――――――――――――――――――――――――――――――――

Polymer PA-2

The composition Y-1 having the following composition was applied onto the photoalignment film PA2 using a bar coater. The coating film formed on the photoalignment film PA2 is heated to 120 ° C. with warm air and then cooled to 60 ° C., and then ultraviolet rays of ^{100 mJ / cm 2 are emitted at a wavelength of 365 nm using a high-pressure mercury lamp under a nitrogen atmosphere. By irradiating the coating film with ultraviolet rays of 500 mJ / cm 2} while heating to 120 ° C., the orientation of the liquid crystal compound was fixed, and a TAC film Y1 having a positive A plate was prepared.
The thickness of the positive A plate was 2.5 μm and the Re (550) was 144 nm. Further, the positive A plate satisfied the relationship of Re (450) ≤ Re (550) ≤ Re (650). Re (450) / Re (550) was 0.82.

―――――――――――――――――――――――――――――――――
Composition Y-1
―――――――――――――――――――――――――――――――――
-The following polymerizable liquid crystal compound LA-1 43.50 parts by mass-The following polymerizable liquid crystal compound LA-2 43.50 parts by mass-The following polymerizable liquid crystal compound LA-3 8.00 parts by mass-The following polymerizable liquid crystal Sex compound LA-4 5.00 parts by mass ・ The following polymerization initiator PI-1 0.55 parts by mass ・ The following leveling agent T-1 0.20 parts by mass ・ Cyclopentanone 235.00 parts by mass ―――――― ―――――――――――――――――――――――――――

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

Polymerizable liquid crystal compound LA-2

Polymerizable liquid crystal compound LA-3

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

Polymerization Initiator PI-1

Leveling agent T-1

[Preparation of TAC film Z1 having a positive C plate]
As the temporary support, the above-mentioned cellulose acylate film 1 was used.
After passing the cellulose acylate film 1 through a dielectric heating roll having a temperature of 60 ° C. and raising the film surface temperature to 40 ° C., an alkaline solution having the composition shown below is applied to one side of the film using a bar coater. The film was applied at 14 ml / m ² , heated to 110 ° C., and conveyed under a steam-type far-infrared heater manufactured by Noritake Co., Ltd. Limited for 10 seconds.
Then, using the same bar coater, 3 ml / m ^{2 of} pure water was applied onto the film.
Then, after repeating washing with water 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 alkali saponified cellulose acylate film 1.

―――――――――――――――――――――――――――――――――
(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 (CH ₂ CH ₂ O) ₂₀ H) 1.0 part by mass, 14.8 parts by mass of propylene glycol ――――――――――――――――――――― ――――――――――――

The coating liquid PA3 for forming a photoalignment film having the following composition was continuously applied onto the alkali saponified cellulose acylate film 1 using the wire bar of # 8. The obtained film was dried with warm air at 60 ° C. for 60 seconds and further with warm air at 100 ° C. for 120 seconds to form a photoalignment film PA3.

―――――――――――――――――――――――――――――――――
Coating liquid PA3 for forming a photoalignment film
―――――――――――――――――――――――――――――――――
・ Polyvinyl alcohol (manufactured by Kuraray, PVA103) 2.4 parts by mass ・ 1.6 parts by mass of isopropyl alcohol ・ 36 parts by mass of methanol ・ 60 parts by mass of water ―――――――――――――――――― ―――――――――――――――

A coating liquid Z1 for forming a positive C plate having the following composition is applied onto the photoalignment film PA3, and the obtained coating film is aged at 60 ° C. for 60 seconds, and then an air-cooled metal halide lamp ( ^{70 mW / cm 2) is used under air.} A positive C plate having a thickness of 0.5 μm is formed by vertically aligning the liquid crystal compound by irradiating an ultraviolet ray of ^{1000 mJ / cm 2} using (manufactured by Igraphics Co., Ltd.) and fixing the orientation state. The TAC film Z1 to have was produced.
The Rth (550) of the obtained positive C plate was -60 nm.

―――――――――――――――――――――――――――――――――
Coating liquid Z1 for forming a positive C plate
―――――――――――――――――――――――――――――――――
・ 80 parts by mass of the following liquid crystal compound LC-1 ・ 20 parts by mass of the following liquid crystal compound LC-2 ・ 1 part by mass of the following vertically oriented liquid crystal compound target S01 ・ Ethylene oxide modified trimethyl propantriacrylate (V # 360, Osaka Organic Chemistry Co., Ltd.) 8 parts by mass, Irgacure 907 (BASF) 3 parts by mass, Kayacure DETX (Nippon Kayaku Co., Ltd.) 1 part by mass, the following compound B03 0.4 parts by mass, methyl ethyl ketone 170 parts by mass Part ・ Cyclohexanone 30 parts by mass ――――――――――――――――――――――――――――――――――

Liquid crystal compound LC-1

Liquid crystal compound LC-2

Vertically oriented liquid crystal compound target S01

Compound B03

[Preparation of adhesives N1 and N2]
Next, an acrylate-based polymer was prepared according to the following procedure.
95 parts by mass of butyl acrylate and 5 parts by mass of acrylic acid are polymerized by a solution polymerization method in a reaction vessel equipped with a cooling tube, a nitrogen introduction tube, a thermometer and a stirrer to achieve an average molecular weight of 2 million and a molecular weight distribution (Mw /). An acrylate-based polymer (S1) of Mn) 3.0 was obtained.

Next, using the obtained acrylate-based polymer (S1), an acrylate-based pressure-sensitive adhesive was prepared with the following composition. These compositions are applied to a separate film surface-treated with a silicone-based release agent using a die coater, dried in an environment of 90 ° C. for 1 minute, irradiated with ultraviolet rays (UV) under the following conditions, and the following acrylate-based Adhesives N1 and N2 (adhesive layer) were obtained. The composition and film thickness of the acrylate-based adhesive are shown below.
<UV irradiation conditions>
Fusion Co. electrodeless lamp H Valve illuminance 600 mW / cm ^2, light quantity 150 mJ / cm ²
-UV illuminance and light intensity were measured using "UVPF-36" manufactured by Eye Graphics.

―――――――――――――――――――――――――――――――――
Acrylate adhesive N1 (thickness 15 μm)
―――――――――――――――――――――――――――――――――
100 parts by mass of the acrylate-based polymer (S1) ・ 11.1 parts by mass of the following (A) polyfunctional acrylate-based monomer ・ 1.1 parts by mass of the following (B) photopolymerization initiator ・ The following (C) isocyanate-based cross-linking agent 1 .0 parts by mass ・ The following (D) silane coupling agent 0.2 parts by mass ―――――――――――――――――――――――――――――――― ―

―――――――――――――――――――――――――――――――――
Acrylate adhesive N2 (film thickness 25 μm)
―――――――――――――――――――――――――――――――――
100 parts by mass of acrylate-based polymer (S1) ・ 1.0 part by mass of the following (C) isocyanate-based cross-linking agent ・ 0.2 parts by mass of the following (D) silane coupling agent ――――――――――― ――――――――――――――――――――――

(A) Polyfunctional acrylate-based monomer: Tris (acryloyloxyethyl) isocyanurate, molecular weight = 423, trifunctional type (manufactured by Toagosei Co., Ltd., trade name "Aronix M-315")
(B) Photopolymerization Initiator: A mixture of benzophenone and 1-hydroxycyclohexylphenylketone in a mass ratio of 1: 1, "Irgacure 500" manufactured by Ciba Specialty Chemicals.
(C) Isocyanate-based cross-linking agent: Trimethylolpropane-modified tolylene diisocyanate (“Coronate L” manufactured by Nippon Polyurethane Industry Co., Ltd.)
(D) Silane coupling agent: 3-glycidoxypropyltrimethoxysilane (“KBM-403” manufactured by Shin-Etsu Chemical Co., Ltd.)

[Making UV adhesive]
A UV adhesive composition having the following composition was prepared.
────────────────────────────────
UV Adhesive Composition ――――――――――――――――――――――――――――――――――
・ CEL2021P (manufactured by Daicel) 70 parts by mass ・ 1,4-butanediol diglycidyl ether 20 parts by mass ・ 2-ethylhexyl glycidyl ether 10 parts by mass ・ CPI-100P 2.25 parts by mass ───────── ────────────────────────

CPI-100P

[Preparation of laminated body A-1]
The retardation side of the TAC film Y1 having the positive A plate and the retardation side of the TAC film Z1 having the positive C plate are bonded together by UV irradiation of ^{600 mJ / cm 2 using the UV adhesive composition.} rice field. The thickness of the UV adhesive layer was 3 μm. The surfaces to be bonded with the UV adhesive were each subjected to corona treatment. Next, the photoalignment film PA2 on the positive A plate Y1 side and the cellulose acylate film 1 were removed to obtain a retardation plate YZ1. The layer structure of the retardation plate YZ1 is a positive A plate Y1, a UV adhesive layer, a positive C plate Z1, a photoalignment film PA3, and a cellulose acylate film 1.
The barrier layer B1 side of the laminated body X1 was bonded to the support side of the low-reflection surface film CV-LC5 (manufactured by FUJIFILM Corporation) using the adhesive N1. Next, only the cellulose acylate film 1 contained in the laminate X1 is removed, and the removed surface and the positive A plate Y1 side of the position retardation plate YZ1 are bonded together using the pressure-sensitive adhesive N1. rice field. Next, the photoalignment film PA3 on the positive C plate C1 side and the cellulose acylate film 1 contained in the retardation plate YZ1 were removed to prepare a laminated body A-1. At this time, the absorption axis of the light absorption anisotropic layer P1 contained in the laminated body X1 and the slow axis of the positive A plate Y1 were bonded so as to form an angle of 45 °. The layer structure of the laminated body A-1 includes a low-reflection surface film CV-LC5, an adhesive layer N1, a barrier layer B1, a light absorption anisotropic layer P1, a photoalignment film PA1, an adhesive layer N1, and a positive A plate. Y1, UV adhesive layer, positive C plate Z1, photoalignment film PA3 and cellulose acylate film 1.

The GALAXY S5 manufactured by SAMSUNG equipped with an organic EL panel (organic EL display element) is disassembled, the touch panel with a circular polarizing plate is peeled off from the organic EL display device, and the circular polarizing plate is further peeled off from the touch panel. And the circular plate plate were isolated respectively. Subsequently, the isolated touch panel was reattached to the organic EL display element, and further, the laminate A-1 produced above was attached onto the touch panel so as not to allow air to enter, thereby producing an organic EL display device. ..

[Examples 2 to 19, Comparative Example 2]
A laminate and an organic EL display device were produced in the same manner as in Example 1 except that the dye A of the composition for forming the light absorption anisotropic layer P1 was changed to the compounds shown in Table 1 and the addition amount.

Dichroic compound V-B10

[Comparative Example 1]
The composition for forming an anisotropic film of absorption P1 is replaced with the composition P2 for forming a light absorption anisotropic layer having the following composition, and the light absorption anisotropic layer P2, the laminate and the organic are used in the same manner as in Example 1. An EL display device was manufactured.

―――――――――――――――――――――――――――――――――
Composition of composition P2 for forming an anisotropic layer of light absorption ――――――――――――――――――――――――――――――――――
-The first bicolor substance C-1 0.65 part by mass-The second bicolor substance M-1 0.15 part by mass-The third bicolor substance Y-1 0.52 mass -Parts-. -1 0.01 parts by mass, cyclopentanone 46.07 parts by mass, tetrahydrofuran 46.07 parts by mass, benzyl alcohol 2.36 parts by mass ――――――――――――――――――― ――――――――――――――

[Example 21]
The coating liquid B2 having the following composition was continuously coated on the light absorption anisotropic layer P2 with a wire bar. Then, the laminate X2 in which the barrier layer B2 having a thickness of 1.0 μm was formed by drying with warm air at 40 ° C. for 1 minute, that is, the cellulose acylate film 1 (transparent support), the photoalignment film PA1, and the light. A laminated body X2 having an absorption anisotropic layer P2 and a barrier layer B2 adjacent to each other in this order was obtained.
The laminated body X1 was replaced with the laminated body X2, and the laminated body and the organic EL display device were produced by the same method as in Example 1.
―――――――――――――――――――――――――――――――――
Composition of coating liquid B2 for forming a barrier layer ――――――――――――――――――――――――――――――――――
-DPHA 27 parts by mass-Dye A F-1 0.40 parts by mass-Initiator Irg2959 3 parts by mass-Methyl isobutyl ketone 70 parts by mass ――――――――――――――――― ――――――――――――――――

The compounds used in the composition for forming a mixed layer are as follows.
DPHA: Mixture of dipentaerythritol pentaacrylate and dipentaerythritol hexaacrylate, manufactured by Nippon Kayaku Co., Ltd.

[Example 22]
A laminate and an organic EL display device were produced in the same manner as in Example 21 except that the dye A of the coating liquid B2 for forming the barrier layer was changed to the compound shown in Table 2 and the addition amount.

[Example 31]
The coating liquid B3 having the following composition was continuously coated on the light absorption anisotropic layer P2 with a wire bar. Then, the laminate X3 having a barrier layer B3 having a thickness of 1.0 μm formed by drying with warm air at 40 ° C. for 1 minute, that is, a cellulose acylate film 1 (transparent support), a photoalignment film PA1, and light. A laminated body X3 having an absorption anisotropic layer P2 and a barrier layer B3 adjacent to each other in this order was obtained. In the obtained laminate X3, the orientation of the absorption axis of the dye A in the barrier layer B3 and the orientation of the absorption axis of the light absorption anisotropic layer P2 were the same.
The laminated body X1 was replaced with the laminated body X3, and the laminated body and the organic EL display device were produced by the same method as in Example 1.
―――――――――――――――――――――――――――――――――
Composition of coating liquid B3 for forming a barrier layer ――――――――――――――――――――――――――――――――――
21 parts by mass of the liquid crystal compound LC-1 ・ 6 parts by mass of the liquid crystal compound LC-2 ・ 0.40 parts by mass of the dye A A-1 described above ・ 3 parts by mass of the initiator Irg2959 ・ 70 parts by mass of methyl isobutyl ketone ―――――――――――――――――――――――――――――――――

[Example 32]
A laminate and an organic EL display device were produced in the same manner as in Example 31 except that the dye A of the coating liquid B3 for forming the barrier layer was changed to the compounds shown in Table 3 and the addition amount.

[Display performance]
The organic EL display device produced was evaluated for visibility and display quality under bright light. The display screen of the display device was displayed in white, and the brightness and color reproducibility were evaluated from the front and the polar angle of 45 degrees based on the following criteria. The evaluation results are shown in Tables 1 to 3 below.
<White display evaluation criteria>
A: Coloring is not visible at all B: Slightly colored is visible C: Slightly colored and slightly low in brightness D: Strongly colored is visible

[Display performance]
The organic EL display device produced was evaluated for visibility and display quality under bright light. The display screen of the display device was set to black, and the reflected color when the fluorescent lamp was projected from the front and the polar angle of 45 degrees was observed. The display performance of the black display was evaluated based on the following criteria. The evaluation results are shown in Tables 1 to 3 below.
<Black display evaluation criteria>
A: Coloring is not visible at all B: Slightly red coloring is visible C: Clearly red coloring is visible

From the results shown in Table 1 above, when the maximum absorption wavelength of dye A is smaller than 630 nm, the display quality is inferior, whereas when the maximum absorption wavelength of dye A is 630 nm or more, the light absorption anisotropic layer is formed. It was found that the coloration of the reflected light can be improved while the absorption band is widened and the display performance is maintained (Examples 1 to 19). Further, from the comparison of Examples 1 to 5, it is displayed in white that the content of the cyanine dye is 0.2 to 0.6% by mass with respect to the total mass of the composition forming the light absorption anisotropic layer. It was found that the display performance in was better. Similarly, from the comparison between Example 10 and Example 11, the content of the azo dye is 0.1 to 0.2% by mass with respect to the total mass of the composition forming the light absorption anisotropic layer. It was found that the display performance in white display became better. Similarly, from the comparison between Examples 15 and 16, the content of the pyrrolopyrrole dye is 0.2 to 1.0% by mass with respect to the total mass of the composition forming the light absorption anisotropic layer. It was found that the display performance in white display was better. Similarly, from the comparison of Examples 17 to 19, it is white that the content of the phthalocyanine dye is 0.1 to 0.3% by mass with respect to the total mass of the composition forming the light absorption anisotropic layer. It was found that the display performance in the display was better.
Further, from the results shown in Table 2, by providing the barrier layer having the dye A on the visible side of the light absorption anisotropic layer, the interfacial reflection generated at the interface between the light absorption anisotropic layer and the adjacent layer is absorbed. It was found that the reflectance and the tint of the reflected light could be improved (Examples 21 to 22).
Further, from the results shown in Table 3, by aligning the absorption axis of the dye A in the barrier layer provided on the visible side of the light absorption anisotropic layer with the absorption axis of the light absorption anisotropic layer, an image of the display device is obtained. It was found that reflection can be effectively prevented while the influence on the display quality such as brightness and color reproducibility is very small without obstructing the display (Examples 31 to 32).
Further, from the comparison between Example 21 and Example 31, it was found that when the dye A contained in the barrier layer was oriented, the display performance in white display became better.
Further, from the comparison between Example 6 and Example 32, even when the dye A is oriented, if the barrier layer adjacent to the light absorption anisotropic layer has the dye A, the reflected light is reflected. It was found that the inhibitory effect of the light was further improved.

Claims (16)

An optical element having at least a light absorption anisotropic layer.
The light absorption anisotropic layer is a layer containing a liquid crystal compound and a dichroic substance.
One of the optical elements contains a dye A having a maximum absorption wavelength in the range of 630 nm or more and 780 nm or less.
An optical element in which the dichroic substance contains a first dichroic substance having a structure different from that of the dye A and having a maximum absorption wavelength in the range of 560 nm or more and 640 nm or less. The optical element according to claim 1, wherein the dye A is a dye having a maximum absorption wavelength in the range of 650 nm or more. The optical element according to claim 1, wherein the dye A is a dye having a maximum absorption wavelength in the range of more than 700 nm. The optical element according to any one of claims 1 to 3, wherein the content of the first dichroic substance is 5 to 20% by mass with respect to the total mass of the light absorption anisotropic layer. The dichroic substance further contains a second dichroic substance and a third dichroic substance.
The second dichroic substance is a dichroic substance having a maximum absorption wavelength in the range of 455 nm or more and less than 560 nm.
The optical element according to any one of claims 1 to 4, wherein the third dichroic substance is a dichroic substance having a maximum absorption wavelength in the range of 380 nm or more and less than 455 nm. The optical element according to any one of claims 1 to 5, wherein the content of the dichroic substance is 7% by mass or more and 35% by mass or less with respect to the total mass of the light absorption anisotropic layer. The optical element according to any one of claims 1 to 6, wherein the dye A is contained in the light absorption anisotropic layer. The optical element according to any one of claims 1 to 7, wherein the dye A is contained in a layer different from the light absorption anisotropic layer. The optical element according to any one of claims 1 to 8, further comprising a barrier layer. 13. Optical element. The optical element according to any one of claims 1 to 10, wherein the dye A has an anthraquinone structure. The optical element according to any one of claims 1 to 11, wherein the visible light average transmittance of the light absorption anisotropic layer is 43% or less. The optical element according to any one of claims 1 to 12, wherein the liquid crystal compound contains a liquid crystal compound exhibiting a smectic phase. The optical element according to any one of claims 1 to 13, wherein the light absorption anisotropic layer is formed from a composition containing a polymer liquid crystal compound. A display device having the optical element according to any one of claims 1 to 14. The display device according to claim 15, wherein the dye A contained in the optical element is contained in a layer located on the viewing side of the light absorption anisotropic layer of the optical element.