Image display apparatus

Abstract

To provide an image display device capable of reducing an interval between image display surfaces of adjacent image display parts in the image display device in which a plurality of image display parts are adjacently arranged.SOLUTION: A liquid crystal display device includes a plurality of image display units and a polarizer disposed on an image display surface side of the image display units, in which the image display units are disposed adjacent to each other, and the polarizer includes at least two dichroic substances having maximum absorption wavelengths in different wavelength ranges and a liquid crystal compound.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to an image display device having a plurality of image display units. [Background technology]

[0002] 2. Description of the Related Art Foldable image display devices and image display devices with large screens include image display devices in which a plurality of image display units are arranged. For example, Patent Document 1 describes an image display device (information processing device) that is a foldable image display device having two screens, comprising a first housing, a second housing, a first display unit provided on one side of the first housing, a second display unit provided on one side of the second housing, a connecting unit that connects the first housing and the second housing so that they can be rotated and the first display unit and the second display unit are adjacent to each other, a detection unit that detects the attitudes of the first housing and the second housing, and a control unit that performs display control on the first display unit and the second display unit based on the detection results of the detection unit, and the control unit selects either the first housing or the second housing depending on the attitudes of the first housing and the second housing when the angle formed between the first housing and the second housing is within a predetermined range, and performs display control on the display unit of the selected housing.

[0003] As described in Patent Document 1, in such an image display device having a plurality of image display sections, for example, a liquid crystal display element, an organic EL (Electro Luminescence) display element, or the like is used for the image display sections.

[0004] As described in Patent Document 2, a polarizer (polarizing plate) is used in these image display elements. For example, in the case of a liquid crystal display element, polarizers with orthogonal absorption axes are provided so as to sandwich a liquid crystal layer in which liquid crystal cells are arranged. Also, organic EL display elements, LED (Light Emitting Diode) display elements, micro LED display elements, etc. usually have an anti-reflection film on the image display surface side that combines a linear polarizer and a λ / 4 wave plate. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 2018-031884 [Patent Document 2] Japanese Patent Application Publication No. 2020-056929 Summary of the Invention [Problem to be solved by the invention]

[0006] As described in Patent Document 2, in such an image display element, iodine-containing polyvinyl alcohol (PVA (polyvinyl alcohol)) is preferably used as the polarizer because of its high degree of polarization.

[0007] In an image display device in which a plurality of image display units are arranged, such as the image display device described in Patent Document 1, one image is often displayed on a plurality of screens. In such a case, it is preferable that the gaps between the image display surfaces, that is, the seams between the image display surfaces, are small in the displayed image.

[0008] However, according to the inventors' research, in conventional image display devices in which multiple image display elements each having a polarizer are arranged as image display sections, the polarizers cause the image display surfaces of adjacent image display sections to be spaced apart. As a result, when one image is displayed on a plurality of image display sections, there is a problem in that gaps between the image display surfaces of adjacent image display sections are visible.

[0009] The object of the present invention is to solve the problems of the prior art and to provide an image display device having a plurality of image display units, which can reduce the distance between the display screens of adjacent image display units. [Means for solving the problem]

[0010] In order to solve this problem, the present invention has the following configuration. [1] A plurality of image display units; a polarizer disposed on the image display surface side of the image display unit, The image display units are arranged adjacent to each other, the polarizer comprises a dichroic material and a liquid crystal compound; An image display device, characterized in that after being kept in an environment of a temperature of 85° C. and a humidity of 85% RH for 100 hours, the polarizer satisfies the following formula: |Te-Tc|<2.0[%] Te: Transmittance [%] at a position 1 mm from the edge of the image display area Tc: Transmittance [%] at a position 10 mm from the edge of the image display area [2] The image display device according to [1], wherein the distance between the image display surfaces of adjacent image display units is 1 mm or less. [3] The image display device according to [1] or [2], wherein the interval between the image display surfaces of adjacent image display units is equal to the interval between pixels in the image display device. [4] The image display device according to any one of [1] to [3], which is capable of being bent between adjacent image display units. [5] The image display device according to any one of [1] to [4], wherein the image display units are arranged one-dimensionally or two-dimensionally. [6] The image display device according to [5], wherein the image display unit is separable. [7] The image display device according to any one of [1] to [6], wherein the image display section is an organic electroluminescence display element. [8] The image display device according to any one of [1] to [6], wherein the image display unit is an LED display element or a micro LED display element. [9] The image display device according to any one of [1] to [8], wherein the liquid crystal compound is a polymer liquid crystal compound containing a repeating unit represented by the following formula (1): [ka] In formula (1), P1 represents the main chain of the repeating unit, L1 represents a single bond or a divalent linking group, SP1 represents a spacer group, M1 represents a mesogenic group, and T1 represents a terminal group.

[10] The image display device according to any one of [1] to [9], wherein the polarizer is formed using a polarizer-forming composition containing a dichroic substance having a crosslinkable group. [Effects of the Invention]

[0011] According to the present invention, in an image display device having a plurality of image display sections, the distance between the display screens of adjacent image display sections can be reduced. [Brief explanation of the drawings]

[0012] [Figure 1] FIG. 1 is a diagram conceptually showing an example of an image display device of the present invention. [Figure 2] FIG. 2 is a diagram conceptually showing an example of a joint portion of the image display unit in the image display device shown in FIG. [Figure 3] FIG. 3 is a diagram conceptually showing another example of the image display device of the present invention. [Figure 4] FIG. 4 is a conceptual diagram for explaining the image display device of the present invention. [Figure 5] FIG. 5 is a conceptual diagram for explaining a conventional image display device. DETAILED DESCRIPTION OF THE INVENTION

[0013] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The image display device of the present invention will be described in detail below with reference to preferred embodiments shown in the accompanying drawings.

[0014] The following description of the components will be given based on typical embodiments of the present invention, but the present invention is not limited to the following embodiments. The drawings shown below are conceptual diagrams for explaining the present invention, and therefore the size, thickness, length, positional relationship, etc. of each component do not necessarily correspond to the actual ones. In this specification, a numerical range expressed using "to" means a range that includes the numerical values ​​before and after "to" as the lower and upper limits.

[0015] FIG. 1 conceptually shows an example of an image display device of the present invention. The image display device of the present invention has a plurality of (two or more) image display sections arranged adjacent to each other, and a polarizer arranged on the image display surface side of the image display section. 1 includes a first image display unit 12A and a second image display unit 12B arranged adjacent to each other. Each of the first image display unit 12A and the second image display unit 12B includes an image display surface 14 and a polarizer 16 arranged on the image display surface 14 side. That is, the first image display section 12A and the second image display section 12B are basically the same image display element.

[0016] In the image display device of the present invention, the polarizer 16 arranged on the image display surface 14 side, i.e., on the viewing surface side of the image display surface 14, is a linear polarizer. Here, in the present invention, the polarizer 16 contains a dichroic material and a liquid crystal compound. The image display device of the present invention uses a polarizer 16 containing a dichroic material and a liquid crystal compound, and in an image display device having a plurality of image display units, the distance between the image display surfaces of adjacent image display units can be made narrower. This point will be described in detail later.

[0017] The image display device 10 shown in FIG. 1 can be bent between the first image display section 12A and the second image display section 12B, for example, by folding back the second image display section 12B, and can also be folded.

[0018] In the image display device 10, there are no limitations on the method for enabling folding between the first image display unit 12A and the second image display unit 12B, and various known methods for connecting adjacently arranged plate-like objects in a manner that allows folding between the plate-like objects can be used. As an example, as conceptually shown in Figure 2, there are exemplified a method of connecting the adjacent end faces of two image display units with a strip-shaped connecting member 20 that can be bent in the short direction, a method of using a hinge, and a method of connecting the adjacent end faces of two image display units with an elastic body.

[0019] As will be described later, the image display device 10 of the present invention can narrow the gap between the image display surfaces of adjacent image display units. Therefore, it is preferable to use a method that makes it possible to bend the image display device 10 between two image display units in this way, so that the adjacent image display units are spaced as little apart as possible. The image display device may be folded so that the image display surface faces inward or outward.

[0020] In the image display device of the present invention, if it is possible to bend between adjacent image display sections, the number of image display sections is not limited to two. For example, in an image display device having six image display units in a 2×3 arrangement shown in Fig. 3 described later, the image display device may be made foldable between the first to third image display units 12C to 12E and the fourth to sixth image display units 12F to 12H. Also, in this image display device, the image display device may be made foldable at two locations: between the first and fourth image display units 12C and 12F and the second and fifth image display units 12D and 12G, and between the second and fifth image display units 12D and 12G and the third and sixth image display units 12E and 12H.

[0021] FIG. 3 conceptually shows another example of the image display device of the present invention. 3 has six image display units: a first image display unit 12C, a second image display unit 12D, a third image display unit 12E, a fourth image display unit 12F, a fifth image display unit 12G, and a sixth image display unit 12H. In other words, this embodiment is what is called a multi-display in which a plurality of image display units are arranged. The image display device 24 has six image display sections arranged in a 2×3 pattern.

[0022] Similar to the image display section of the image display device 10 shown in FIG. 1, the first image display section 12C, the second image display section 12D, the third image display section 12E, the fourth image display section 12F, the fifth image display section 12G, and the sixth image display section 12H all have an image display surface 14 and a polarizer 16 arranged on the image display surface 14 side. That is, the first to sixth image display sections 12C to 12H are basically the same image display elements.

[0023] In the image display device of the present invention, the number of image display sections is not limited to six as in the illustrated example, but may be five or less, or seven or more. There is also no limitation on the arrangement of the image display units, and the arrangement of the image display units may be one-dimensional or two-dimensional. There are also no limitations on the two-dimensional arrangement of the image display units. For example, when 12 image display units are arranged, the image display units may be arranged in a 2 x 6 array or a 3 x 4 array. In this case, the image display units may be arranged in a one-dimensional 1 x 12 array.

[0024] In a multi-display as shown in FIG. 3, the image display sections may be fixed in an array, but are preferably individually separable. There is no limitation on the method for detachably connecting the image display units, and various known methods can be used, such as a method using a known jig that detachably engages plate-like objects, a method in which engaging portions such as projections and recesses that engage with each other are provided on the facing side surfaces of adjacent image display units, and a method in which the facing side surfaces of adjacent image display units are fixed to each other using adhesive tape, magnets, etc. Alternatively, a support base (support plate) may be used to support all the image display units, and the image display units may be detachably attached to this support base using the method described above. Alternatively, the arranged image display units may be fixed using a frame such as a picture frame, and the individual image display units may be separated by removing the frame. When the arranged image display units are fixed using a frame, a support plate for supporting the arranged image display units may be used in combination as needed.

[0025] In the present invention, there are no restrictions on the first image display unit 12A and the second image display unit 12B, which have the image display surface 14, and the first image display unit 12C to the sixth image display unit 12H, and various known image display elements (image display panels) can be used. Examples include a liquid crystal display element, an organic EL display element, an LED display element, and a micro LED display element. Among these, organic EL display elements, LED display elements, and micro LED display elements are preferably used.

[0026] The image display surface is an area where an image is displayed, that is, an area where pixels for displaying an image are arranged in an image display element. In addition to the image display surface 14 shown in the figure, the image display unit also has various known components according to the image display element, such as optical elements such as a wavelength plate, a driver for driving, a driver control means, and a backlight unit (liquid crystal display element), as necessary.

[0027] Here, the liquid crystal display element (liquid crystal display panel) has a configuration in which two polarizers with perpendicular absorption axes are provided on both sides of a liquid crystal cell having a liquid crystal layer. When the liquid crystal display element is used as the image display section, the polarizer provided on the exit side (image display surface side) of the two polarizers is the polarizer 16 of the present invention. Furthermore, organic EL display elements (organic EL display panels), LED display elements (LED display panels), and micro LED display elements (micro LED display panels) usually have an antireflection film made up of a linear polarizer and a ¼λ wavelength plate on the image display surface side. When an organic EL display element, an LED display element, or a micro LED display element is used as the image display section, the linear polarizer of the antireflection film serves as the polarizer 16 of the present invention.

[0028] In the image display device of the present invention, if necessary, the surface of the polarizer 16 may have a layer (film) that exhibits the desired function, such as a protective layer, a barrier layer, an anti-fingerprint layer, an anti-reflection layer, a retardation film, a depolarizing film, and a shatterproof film.

[0029] As described above, the image display device of the present invention has a plurality of adjacent image display sections, and has a polarizer 16 on the image display surface side of the image display sections. The polarizer 16 is a polarizer containing a dichroic material and a liquid crystal compound. The image display device of the present invention has such a configuration that, in an image display device in which a plurality of image display units are arranged adjacent to each other, the distance between the image display surfaces of adjacent image display units can be reduced, and as a result, in an image display device in which a plurality of image display units are arranged adjacent to each other, the present invention makes it possible to display images in which the gaps between the image display surfaces, i.e., the seams between the screens, are not noticeable.

[0030] As described in Patent Document 1, an image display device in which a plurality of image display sections are arranged uses a liquid crystal display element, an organic EL display element, etc. As described above, these image display elements have a polarizer on the image display surface side. Here, as shown in Patent Document 2, iodine-containing PVA is preferably used as a polarizer in an image display element because it has a high degree of polarization. In the following description, a polarizer using PVA is also referred to as a "PVA-based polarizer."

[0031] However, according to the study by the present inventors, PVA-based polarizers have poor moisture resistance and deteriorate from their edges due to moisture absorption. As a result, image display units using PVA-based polarizers suffer from discoloration at their edges. In particular, in high-temperature and high-humidity environments, the deterioration progresses from the edges, resulting in discolored areas extending several millimeters from the edges. Furthermore, since PVA polarizers are hard and brittle, when they are punched to cut them into a desired shape, cracks may occur at the edges. Furthermore, PVA-based polarizers have a thick functional layer made of PVA film, and require protective films to be attached to both sides, which makes the polarizer thick, and when cut using a laser, the edges may be burned up to about 1 mm in length.

[0032] Therefore, in order to prevent deterioration of the polarizer edges from adversely affecting the displayed image, image display elements using PVA-based polarizers must take measures such as coloring the edges black or keeping the edges of the image display surface sufficiently away from the edges of the polarizer. Furthermore, in an image display device in which image display units are arranged adjacent to each other, if the edges of the polarizers deteriorate, for example, in the case of a liquid crystal display element, the edges become colorless and a pure white display is displayed, and in the case of an organic EL display element, light escapes from the edges, resulting in the gaps between the display screens, i.e., the seams between the images, becoming conspicuous. That is, in an image display device in which image display elements using a PVA-based polarizer are used as image display units and image display units are arranged adjacent to each other, the end of the image display surface 14 in the image display unit 100 needs to be located significantly inward with respect to the end of the polarizer 104, as conceptually shown in Fig. 5. Therefore, when image display units using a PVA-based polarizer are arranged adjacent to each other, the distance d between the image display surfaces 14 in the adjacent image display units 100 becomes large, as shown in Fig. 5. As a result, when an image is displayed on multiple image display units as a single screen, the distance between the image display surfaces 14 of adjacent image display units, i.e., the seams between the screens, becomes wider, and gaps between the image display surfaces become visible.

[0033] In contrast to this, in the image display device of the present invention, a polarizer containing a dichroic material and a liquid crystal compound is used as the polarizer 16 of the image display section. This polarizer has high moisture resistance and is thin because it is formed by a coating method, which prevents deterioration of the edges due to moisture absorption, as well as cracking and scorching at the edges when cut, as occurs with PVA-based polarizers. Therefore, in the image display device of the present invention, as conceptually shown in Fig. 4 exemplifying the image display device 10 (Fig. 1), in the image display section, the edge of the image display surface 14 can be set at the very edge of the polarizer 16. Therefore, in the adjacent first image display section 12A and second image display section 12B, the distance d between the image display surfaces 14, i.e., the seam between the screens, can be significantly narrowed, as shown in Fig. 4. As a result, according to the present invention, in an image display device in which multiple image display units are arranged adjacent to each other, when an image is displayed on the multiple image display units as a single screen, an image can be displayed in which gaps in the image display surface are not visible.

[0034] In the image display device of the present invention, the distance between the image display surfaces of adjacent image display sections, that is, the distance d in FIG. 4, is not limited, but is preferably narrower. Specifically, the distance d is preferably 1 mm or less, and more preferably 0.2 mm or less. Furthermore, although it is generally preferable that the interval d is narrow, from the viewpoint of making the interval on the image display surface less noticeable, it is preferable that the interval d coincides with the interval between pixels in the image display device.

[0035] In the image display device of the present invention, the polarizer 16 contains a liquid crystal compound and a dichroic material. As the polarizer 16, various known polarizers containing a liquid crystal compound and a dichroic material can be used. In the polarizer, the dichroic material is also aligned in a predetermined direction along the alignment of the liquid crystal compound, and it is particularly preferred that the dichroic material be aligned horizontally. The following first details the materials used to form the polarizer.

[0036] (liquid crystal compound) As the liquid crystal compound, 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 since it will result in a higher degree of orientation of the dichroic material. Here, the term "polymeric liquid crystal compound" refers to a liquid crystal compound having a repeating unit in its chemical structure. Furthermore, the term "low molecular weight liquid crystal compound" refers to a liquid crystal compound that does not have a repeating unit in its chemical structure. Examples of the polymer liquid crystal compound include the thermotropic liquid crystalline polymer described in JP 2011-237513 A and the polymer liquid crystal compound described in paragraphs

[0012] to

[0042] of WO 2018 / 199096 A. Examples of low molecular weight liquid crystal compounds include the liquid crystal compounds described in paragraphs

[0072] to

[0088] of JP 2013-228706 A, and among them, liquid crystal compounds exhibiting smectic properties are preferred. 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.

[0037] As the liquid crystal compound, a polymer liquid crystal compound containing a repeating unit represented by the following formula (1) (hereinafter also abbreviated as "repeating unit (1)") is preferred, since it results in a higher degree of orientation of the dichroic substance.

[0038] [ka]

[0039] In the above formula (1), P1 represents the main chain of the repeating unit, L1 represents a single bond or a divalent linking group, SP1 represents a spacer group, M1 represents a mesogenic group, and T1 represents a terminal group.

[0040] Examples of the main chain of the repeating unit represented by P1 include groups represented by the following formulae (P1-A) to (P1-D). Among these, the group represented by the following formula (P1-A) is preferred in terms of the variety of monomers that can be used as raw materials and ease of handling.

[0041] [ka]

[0042] In the above formulas (P1-A) to (P1-D), "*" represents the bonding position with L1 in the above formula (1). In the above formulas (P1-A) to (P1-D), R 1 , R 2 , R 3 and R 4 are each independently a hydrogen atom, a halogen atom, a cyano group, an alkyl group having 1 to 10 carbon atoms, or an alkoxy group having 1 to 10 carbon atoms. The alkyl group may be a linear or branched alkyl group, or an alkyl group having a cyclic structure (a cycloalkyl group). The alkyl group preferably has 1 to 5 carbon atoms. The group represented by the above formula (P1-A) is preferably one unit of a partial structure of a poly(meth)acrylic acid ester obtained by polymerization of a (meth)acrylic acid ester. The group represented by the above formula (P1-B) is preferably an ethylene glycol unit formed by ring-opening polymerization of the epoxy group of a compound having an epoxy group. The group represented by the above formula (P1-C) is preferably a propylene glycol unit formed by ring-opening polymerization of the oxetane group of a compound having an oxetane group. The group represented by the formula (P1-D) is preferably a siloxane unit of a polysiloxane obtained by condensation polymerization of a compound having at least one of an alkoxysilyl group and a silanol group. Here, the compound having at least one of an alkoxysilyl group and a silanol group is preferably a compound represented by the formula SiR 4 (OR 5 )2-, wherein R 4 is R in (P1-D) 4 is synonymous with R 5 each independently represents a hydrogen atom or an alkyl group having 1 to 10 carbon atoms.

[0043] In the above formula (1), L1 is a single bond or a divalent linking group. The divalent linking group represented by L1 includes -C(O)O-, -O-, -S-, and -C(O)NR 6 -, -SO2-, and -NR 6 R 7 In the formula, R 6and R 7 each independently represents a hydrogen atom or an alkyl group having 1 to 6 carbon atoms which may have a substituent. When P1 is a group represented by formula (P1-A), L1 is preferably a group represented by -C(O)O-, since this increases the degree of orientation of the dichroic material. When P1 is a group represented by any of the formulae (P1-B) to (P1-D), L1 is preferably a single bond, since this increases the degree of orientation of the dichroic material.

[0044] In the above formula (1), the spacer group represented by SP1 preferably contains at least one structure selected from the group consisting of an oxyethylene structure, an oxypropylene structure, a polysiloxane structure, and a fluorinated alkylene structure, in view of the ease of exhibiting liquid crystallinity and the availability of raw materials. Here, the oxyethylene structure represented by SP1 is *-(CH2-CH2O) n1 A group represented by -* is preferred. In the formula, n1 represents an integer of 1 to 20, and * represents the bonding position with L1 or M1 in the above formula (1). n1 is preferably an integer of 2 to 10, more preferably an integer of 2 to 4, and most preferably 3, in order to increase the degree of orientation of the dichroic material. In addition, the oxypropylene structure represented by SP1 is *-(CH(CH3)-CH2O) in order to increase the degree of orientation of the dichroic material. n2 A group represented by -* is preferred, where n2 represents an integer of 1 to 3, and * represents the bonding position to L1 or M1. In addition, the polysiloxane structure represented by SP1 is *-(Si(CH3)2-O) because it increases the degree of orientation of the dichroic material. n3 A group represented by -* is preferred, where n3 represents an integer of 6 to 10, and * represents the bonding position to L1 or M1. In addition, the fluorinated alkylene structure represented by SP1 is *-(CF2-CF2) because it increases the degree of orientation of the dichroic material. n4 A group represented by -* is preferred, where n4 represents an integer of 6 to 10, and * represents the bonding position to L1 or M1.

[0045] In the above formula (1), the mesogenic group represented by M1 is a group that represents the main skeleton of the liquid crystal molecule that contributes to the formation of liquid crystals. The liquid crystal molecules exhibit liquid crystallinity, which is a state (mesophase) intermediate between a crystalline state and an isotropic liquid state. There are no particular limitations on the mesogenic group, and reference can be made to, for example, "Flussige Kristalle in Tabellen II" (VEB Deutsche Verlag fur Grundstoff Industrie, Leipzig, 19th edition, 2000), particularly the description in Chapter 3. The mesogenic group is preferably, for example, a group having at least one cyclic structure selected from the group consisting of an aromatic hydrocarbon group, a heterocyclic group, and an alicyclic group. The mesogenic group preferably has an aromatic hydrocarbon group, more preferably has 2 to 4 aromatic hydrocarbon groups, and even more preferably has 3 aromatic hydrocarbon groups, in order to increase the degree of orientation of the dichroic substance.

[0046] As the mesogenic group, from the viewpoints of liquid crystallinity expression, adjustment of the liquid crystal phase transition temperature, availability of raw materials and suitability for synthesis, as well as a higher degree of orientation of the dichroic substance, a group represented by the following formula (M1-A) or (M1-B) is preferred, and a group represented by formula (M1-B) is more preferred.

[0047] [ka]

[0048] In formula (M1-A), A1 is a divalent group selected from the group consisting of an aromatic hydrocarbon group, a heterocyclic group, and an alicyclic group, which may be substituted with an alkyl group, a fluorinated alkyl group, an alkoxy group, or a substituent. The divalent group represented by A1 is preferably a 4- to 6-membered ring. The divalent group represented by A1 may be a monocyclic ring or a condensed ring. * indicates the binding position to SP1 or T1.

[0049] Examples of the divalent aromatic hydrocarbon group represented by A1 include a phenylene group, a naphthylene group, a fluorene-diyl group, an anthracene-diyl group, and a tetracene-diyl group. From the viewpoints of the diversity of mesogenic skeleton designs and the availability of raw materials, a phenylene group or a naphthylene group is preferred, and a phenylene group is more preferred.

[0050] The divalent heterocyclic group represented by A1 may be either aromatic or non-aromatic, but is preferably a divalent aromatic heterocyclic group in that it increases the degree of orientation of the dichroic material. Atoms other than carbon that constitute a divalent aromatic heterocyclic group include a nitrogen atom, a sulfur atom, and an oxygen atom. When an aromatic heterocyclic group has multiple atoms that constitute the ring other than carbon, these atoms may be the same or different. Examples of divalent aromatic heterocyclic groups include a pyridylene group (pyridine-diyl group), a pyridazine-diyl group, an imidazole-diyl group, a thienylene (thiophene-diyl group), a quinolylene group (quinoline-diyl group), an isoquinolylene group (isoquinoline-diyl group), an oxazole-diyl group, a thiazole-diyl group, an oxadiazole-diyl group, a benzothiazole-diyl group, a benzothiadiazole-diyl group, a phthalimido-diyl group, a thienothiazole-diyl group, a thiazolothiazole-diyl group, a thienothiophene-diyl group, and a thienoxazole-diyl group.

[0051] Examples of the divalent alicyclic group represented by A1 include a cyclopentylene group and a cyclohexylene group.

[0052] In formula (M1-A), a1 represents an integer of 1 to 10. When a1 is 2 or more, multiple A1 may be the same or different.

[0053] In formula (M1-B), A2 and A3 each independently represent a divalent group selected from the group consisting of an aromatic hydrocarbon group, a heterocyclic group, and an alicyclic group. Specific examples and preferred embodiments of A2 and A3 are the same as those of A1 in formula (M1-A), and therefore, description thereof will be omitted. In formula (M1-B), a2 represents an integer of 1 to 10. When a2 is 2 or greater, multiple A2s may be the same or different, multiple A3s may be the same or different, and multiple LA1s may be the same or different. a2 is preferably an integer of 2 or greater, and more preferably 2, in order to increase the degree of orientation of the dichroic material. In formula (M1-B), when a2 is 1, LA1 is a divalent linking group. When a2 is 2 or more, the multiple LA1 are each independently a single bond or a divalent linking group, and at least one of the multiple LA1 is a divalent linking group. When a2 is 2, it is preferable that one of the two LA1 is a divalent linking group and the other is a single bond, since this increases the degree of orientation of the dichroic material.

[0054] In formula (M1-B), examples of the divalent linking group represented by LA1 include -O-, -(CH2) g -, -(CF2) g -, -Si(CH3)2-, -(Si(CH3)2O) g -, -(OSi(CH3)2) g-(g represents an integer from 1 to 10), -N(Z)-, -C(Z)=C(Z')-, -C(Z)=N-, -N=C(Z)-, -C(Z)2-C (Z')2-, -C(O)-, -OC(O)-, -C(O)O-, -OC(O)O-, -N(Z)C(O)-, -C(O)N(Z)-, -C (Z)=C(Z')-C(O)O-, -OC(O)-C(Z)=C(Z')-, -C(Z)=N-, -N=C(Z)-, -C(Z)=C( Z')-C(O)N(Z”)-, -N(Z”)-C(O)-C(Z)=C(Z')-, -C(Z)=C(Z')-C(O)-S-, -SC( Examples include -O)-C(Z)=C(Z')-, -C(Z)=NN=C(Z')- (Z, Z', and Z" each independently represent a hydrogen atom, a C1-C4 alkyl group, a cycloalkyl group, an aryl group, a cyano group, or a halogen atom), -C≡C-, -N=N-, -S-, -S(O)-, -S(O)(O)-, -(O)S(O)O-, -O(O)S(O)O-, -SC(O)-, and -C(O)S-. Of these, -C(O)O- is preferred because it further increases the degree of orientation of the dichroic substance. LA1 may be a group formed by combining two or more of these groups.

[0055] In the above formula (1), examples of the terminal group represented by T1 include 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, 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, 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, a ureido group having 1 to 10 carbon atoms, and a (meth)acryloyloxy group-containing group. Examples of the (meth)acryloyloxy group-containing group include a group represented by -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 represents a (meth)acryloyloxy group).

[0056] T1 is preferably an alkoxy group having 1 to 10 carbon atoms, more preferably an alkoxy group having 1 to 5 carbon atoms, and even more preferably a methoxy group, in that the degree of orientation of the dichroic material is increased. These terminal groups may be further substituted with these groups or polymerizable groups described in JP-A-2010-244038.

[0057] T1 is preferably a polymerizable group, since this improves the adhesion between the polarizer and the optically anisotropic layer and improves the cohesive strength of the film. The polymerizable group is preferably a radically polymerizable group or a cationically polymerizable group. As the radical polymerizable group, a generally known radical polymerizable group can be used, and an acryloyl group or a methacryloyl group is preferred. In this case, it is known that the polymerization rate of an acryloyl group is generally fast, and an acryloyl group is preferred from the viewpoint of improving productivity, but a methacryloyl group can also be used as the polymerizable group. The cationic polymerizable group may be a generally known cationic polymerizable group, such as an alicyclic ether group, a cyclic acetal group, a cyclic lactone group, a cyclic thioether group, a spiro orthoester group, or a vinyloxy group. Among these, an alicyclic ether group or a vinyloxy group is preferred, and an epoxy group, an oxetanyl group, or a vinyloxy group is more preferred.

[0058] The weight average molecular weight (Mw) of the polymeric liquid crystal compound containing the repeating unit represented by the above formula (1) is preferably 1000 to 500000, more preferably 2000 to 300000. When the Mw of the polymeric liquid crystal compound is within the above range, the polymeric liquid crystal compound is easy to handle. In particular, from the viewpoint of suppressing cracks during application, the weight average molecular weight (Mw) of the polymer liquid crystal compound is preferably 10,000 or more, and more preferably 10,000 to 300,000. In addition, from the viewpoint of the temperature latitude of the degree of orientation, the weight average molecular weight (Mw) of the polymer liquid crystal compound is preferably less than 10,000, and more preferably 2,000 or more and less than 10,000. Here, the weight average molecular weight and number average molecular weight in the present invention are values ​​measured by gel permeation chromatography (GPC). Solvent (eluent): N-methylpyrrolidone ·Device name: TOSOH HLC-8220GPC Column: Three TOSOH TSKgel Super AWM-H (6 mm x 15 cm) columns connected together Column temperature: 25℃ Sample concentration: 0.1% by mass ·Flow rate: 0.35mL / min Calibration curve: TOSOH TSK standard polystyrene. Calibration curves are based on seven samples with Mw = 2,800,000 to 1,050 (Mw / Mn = 1.03 to 1.06).

[0059] The content of the liquid crystal compound is preferably 50% by mass or more, more preferably 70% by mass or more, based on the total mass of the polarizer. There is no particular upper limit, but it is often 95% by mass or less.

[0060] (dichroic substance) The dichroic substance is not particularly limited, and examples thereof include visible light absorbing substances (dichroic dyes), luminescent substances (fluorescent substances, phosphorescent substances), ultraviolet absorbing substances, infrared absorbing substances, nonlinear optical substances, carbon nanotubes, and inorganic substances (e.g., quantum rods), and any conventionally known dichroic substance (dichroic dye) can be used. For example, paragraphs

[0067] to

[0071] of Japanese Patent Publication No. 2013-228706, paragraphs

[0008] to

[0026] of Japanese Patent Publication No. 2013-227532, paragraphs

[0008] to

[0015] of Japanese Patent Publication No. 2013-209367, paragraphs

[0045] to

[0058] of Japanese Patent Publication No. 2013-014883, paragraphs

[0012] to

[0029] of Japanese Patent Publication No. 2013-109090, and paragraphs

[0009] to [0 017] paragraph, paragraphs

[0051] to

[0065] of JP 2013-037353 A, paragraphs

[0049] to

[0073] of JP 2012-063387 A, paragraphs

[0016] to

[0018] of JP 11-305036 A, paragraphs

[0009] to

[0011] of JP 2001-133630 A, paragraphs

[0030] to

[0169] of JP 2011-215337 A, and paragraphs

[0021] to [00 75] paragraph, paragraphs

[0011] to

[0025] of JP 2010-215846 A, paragraphs

[0017] to

[0069] of JP 2011-048311 A, paragraphs

[0013] to

[0133] of JP 2011-213610 A, paragraphs

[0074] to

[0246] of JP 2011-237513 A, paragraphs

[0005] to

[0051] of JP 2016-006502 A, and paragraphs

[0005] to

[0051] of WO2016 / 060173 A Examples of such compounds include those described in paragraph

[0041] , paragraphs

[0008] to

[0062] of WO2016 / 136561, paragraphs

[0014] to

[0033] of WO2017 / 154835, paragraphs

[0014] to

[0033] of WO2017 / 154695, paragraphs

[0013] to

[0037] of WO2017 / 195833, and paragraphs

[0014] to

[0034] of WO2018 / 164252.

[0061] In the present invention, two or more dichroic substances may be used in combination. For example, from the viewpoint of making the resulting polarizer closer to black, it is preferable to use in combination at least one dichroic substance having an absorption maximum in the wavelength range of 370 nm or more and less than 500 nm and at least one dichroic substance having an absorption maximum in the wavelength range of 500 nm or more and less than 700 nm.

[0062] The dichroic substance may have a crosslinkable group. Examples of the crosslinkable group include a (meth)acryloyl group, an epoxy group, an oxetanyl group, and a styryl group, and among these, a (meth)acryloyl group is preferred.

[0063] The content of the dichroic substance is preferably 2 to 80 parts by mass, more preferably 5 to 30 parts by mass, relative to 100 parts by mass of the liquid crystal compound.

[0064] (Polarizer manufacturing method) The method for producing a polarizer is not particularly limited, and examples thereof include a method using a polarizer-forming composition containing a liquid crystal compound and a dichroic substance. Specifically, a method is preferred in which the polarizer-forming composition is applied to a predetermined support to form a coating film, and the liquid crystal component in the coating film is aligned. The liquid crystal component is a component including not only the above-mentioned liquid crystal compound but also a dichroic substance having liquid crystallinity when the above-mentioned dichroic substance has liquid crystallinity. The liquid crystal compound and dichroic substance contained in the polarizer-forming composition are as described above.

[0065] The polarizer-forming composition may contain components other than the above-mentioned liquid crystal compound and dichroic material.

[0066] The polarizer-forming composition preferably contains a polymerization initiator. The polymerization initiator is not particularly limited, but a photosensitive compound, that is, a photopolymerization initiator, is preferred. As the photopolymerization initiator, various compounds can be used without particular limitation. Examples of the photopolymerization initiator include α-carbonyl compounds (U.S. Pat. Nos. 2,367,661 and 2,367,670), acyloin ethers (U.S. Pat. No. 2,448,828), α-hydrocarbon-substituted aromatic acyloin compounds (U.S. Pat. No. 2,722,512), polynuclear quinone compounds (U.S. Pat. Nos. 3,046,127 and 2,951,758), and combinations of triarylimidazole dimers and p-aminophenyl ketones (U.S. Pat. No. 3,549,367). detailed description), acridine and phenazine compounds (JP 60-105667 A and U.S. Pat. No. 4,239,850 A), oxadiazole compounds (U.S. Pat. No. 4,212,970 A), o-acyloxime compounds (JP 2016-027384 A

[0065] ), and acylphosphine oxide compounds (JP 63-040799 A, JP 5-029234 A, JP 10-095788 A, and JP 10-029997 A).

[0067] When the polarizer-forming composition contains a polymerization initiator, the content of the polymerization initiator is preferably 0.01 to 30 parts by mass, more preferably 0.1 to 15 parts by mass, per 100 parts by mass of the total of the dichroic substance and the liquid crystal compound.

[0068] The polarizer-forming composition preferably contains a surfactant. By including a surfactant, it is expected that the smoothness of the coating surface will be improved, the degree of orientation will be further improved, and repelling and unevenness will be suppressed, thereby improving in-plane uniformity. The surfactant is preferably one that aligns the dichroic substance and the liquid crystal compound horizontally on the coating surface side, and examples thereof include the compounds described in paragraphs

[0155] to

[0170] of WO 2016 / 009648 and the compounds (horizontal alignment agents) described in paragraphs

[0253] to

[0293] of JP 2011-237513 A.

[0069] When the polarizer-forming composition contains a surfactant, the content of the surfactant is preferably 0.001 to 5 parts by mass, more preferably 0.01 to 3 parts by mass, per 100 parts by mass of the total of the dichroic substance and the liquid crystal compound.

[0070] From the viewpoint of workability, the composition for forming a polarizer preferably contains a solvent. Examples of the solvent include organic solvents such as ketones, ethers, aliphatic hydrocarbons, alicyclic hydrocarbons, aromatic hydrocarbons, halogenated carbons, esters, alcohols, cellosolves, cellosolve acetates, sulfoxides, amides, and heterocyclic compounds, as well as water. These solvents may be used alone or in combination of two or more.

[0071] When the polarizer-forming composition contains a solvent, the content of the solvent is preferably from 80 to 99% by mass, more preferably from 83 to 97% by mass, based on the total mass of the polarizer-forming composition.

[0072] The support on which the polarizer-forming composition is applied is not particularly limited, and the support will be described in detail later. The support may have an alignment layer on its surface. Methods for forming an alignment film include, for example, rubbing an organic compound (preferably a polymer) onto the film surface, oblique vapor deposition of an inorganic compound, formation of a layer with microgrooves, and accumulation of an organic compound (e.g., ω-tricosanoic acid, dioctadecylmethylammonium chloride, and methyl stearate) by the Langmuir-Blodgett method (LB film). The alignment layer is preferably an alignment film formed by a rubbing treatment or a photo-alignment film formed by light irradiation. The photo-alignment compound contained in the photo-alignment film may be a known material. As the photo-alignment compound, it is preferable to use a photosensitive compound having a photoreactive group that undergoes at least one of dimerization and isomerization by the action of light. Furthermore, the polarizer-forming composition may be applied onto an optically anisotropic layer, which will be described later, and in this case, the optically anisotropic layer functions as an alignment film.

[0073] The method for applying the polarizer-forming composition is not particularly limited, and examples thereof include curtain coating, dip coating, spin coating, print coating, spray coating, slot coating, roll coating, slide coating, blade coating, gravure coating, and wire bar coating.

[0074] The method for orienting the liquid crystal component in the coating film is not particularly limited, but heat treatment is preferred. From the viewpoint of manufacturability, the heat treatment temperature is preferably 10 to 250° C., more preferably 25 to 190° C. The heating time is preferably 1 to 300 seconds, more preferably 1 to 60 seconds. After the heating treatment, a cooling treatment may be carried out as necessary. The cooling treatment is a treatment in which the coated film after heating is cooled to about room temperature (20 to 25°C). This allows the alignment of the liquid crystalline component contained in the coated film to be fixed. The cooling method is not particularly limited, and can be carried out by a known method.

[0075] After the liquid crystal component is aligned, a curing treatment may be carried out, if necessary. When the polarizer contains a crosslinkable group (polymerizable group), the curing treatment is carried out by heating and / or light irradiation (exposure).

[0076] The thickness of the polarizer is not particularly limited, but is preferably from 100 to 8000 nm, more preferably from 300 to 5000 nm. The thickness of the polarizer refers to the average thickness of the polarizer, which is determined by measuring the thickness at any five or more positions of the polarizer and calculating the arithmetic average.

[0077] In the image display device of the present invention in which image display sections each having a polarizer 16 containing such a liquid crystal compound and a dichroic material are arranged adjacent to each other, the polarizer 16 preferably has high heat resistance and moisture resistance. Specifically, after the image display device of the present invention is kept in an environment of a temperature of 85°C and a humidity of 85% RH for 100 hours, it is preferable that the transmittance Te [%] of the polarizer 16 at a position 1 mm from the end of the image display section and the transmittance Tc [%] at a position 10 mm from the end of the image display section satisfy the following formula: |Te-Tc|<2.0(%) When the polarizer 16 satisfies this formula, the polarizer 16 can be more effectively prevented from deteriorating under high temperature and high humidity conditions, and degradation of the image quality of the displayed image due to the degradation of the polarizer 16 can be more effectively prevented.

[0078] In the image display device of the present invention, it is preferable that the absorption axes of the polarizers 16 in each image display section all be oriented in the same direction. In an image display device having multiple image display units, by aligning the absorption axes of the polarizers 16 of each image display unit in the same direction, it becomes possible to properly observe the images displayed on all image display units, even when observing images while wearing polarized sunglasses, for example.

[0079] In particular, in a bendable image display device 10 as shown in FIG. 1, it is preferable that the direction of the absorption axis of the polarizer 16 is parallel or perpendicular to the bending line. 1, in a foldable image display device 10, images may be viewed with the image display unit folded, for example, at 90°, rather than in a flat state. By orienting the absorption axis of the polarizer 16 parallel or perpendicular to the folding line, it is possible to prevent light emitted from one image display unit from being reflected by the other, thereby preventing a decrease in visibility, even when an image is viewed in this folded state.

[0080] The image display device of the present invention has been described in detail above, but the present invention is not limited to the above examples, and various improvements and modifications may be made within the scope of the present invention. [Example]

[0081] The present invention will be described in more detail below with reference to examples. Note that the materials, amounts used, ratios, treatment contents, treatment procedures, etc. shown in the following examples can be appropriately changed without departing from the spirit of the present invention. Therefore, the scope of the present invention should not be construed as being limited by the examples shown below.

[0082] [Example 1] [Preparation of transparent support] <Preparation of cellulose acylate dope for core layer> The following composition was charged into a mixing tank and stirred to dissolve each component, thereby preparing a cellulose acetate solution to be used as a cellulose acylate dope for the core layer. ---------------------------------------------------------------------------------- Core layer: cellulose acylate dope ---------------------------------------------------------------------------------- 100 parts by mass of cellulose acetate with an acetyl substitution degree of 2.88 In the example of JP 2015-227955 A 12 parts by weight of the described polyester compound B 2 parts by mass of the following compound F Methylene chloride (first solvent) 430 parts by mass Methanol (second solvent) 64 parts by weight ----------------------------------------------------------------------------------

[0083] Compound F [ka]

[0084] <Preparation of outer layer cellulose acylate dope> To 90 parts by mass of the above-mentioned cellulose acylate dope for the core layer, 10 parts by mass of the following matting agent solution was added to prepare a cellulose acetate solution to be used as the cellulose acylate dope for the outer layer.

[0085] ---------------------------------------------------------------------------------- Matting agent solution ---------------------------------------------------------------------------------- Silica particles with an average particle size of 20 nm (AEROSIL R972, manufactured by Nippon Aerosil Co., Ltd.) 2 parts by mass Methylene chloride (first solvent) 76 parts by mass Methanol (second solvent) 11 parts by mass 1 part by mass of the above-mentioned cellulose acylate dope for the core layer ----------------------------------------------------------------------------------

[0086] <Preparation of Cellulose Acylate Film 1> The core layer cellulose acylate dope and the outer layer cellulose acylate dope were filtered through a filter paper having an average pore size of 34 μm and a sintered metal filter having an average pore size of 10 μm, and then, using a band casting machine, the core layer cellulose acylate dope and the outer layer cellulose acylate dopes on both sides of it were simultaneously cast onto a drum at 20°C from the casting nozzle. Next, the film was peeled off when the solvent content was 20% by mass, and both ends in the width direction of the film were fixed with tenter clips, and the film was dried while being stretched in the transverse direction at a stretch ratio of 1.1. Thereafter, the film was further dried by being transported between rolls of a heat treatment device, thereby preparing an optical film (transparent support) having a thickness of 40 μm. This optical film is designated as cellulose acylate film 1.

[0087] [Formation of photo-alignment film PA1] The coating solution PA1 for forming a photo-alignment film, which will be described later, was continuously applied onto the cellulose acylate film 1 (support) using a wire bar. The support on which the coating film was formed was dried with hot air at 140°C for 120 seconds. Subsequently, the coating film was irradiated with polarized ultraviolet light (10 mJ / cm). 2A photo-alignment film PA1 was formed by irradiating the substrate with a super-high pressure mercury lamp (using an ultra-high pressure mercury lamp), and a TAC (triacetyl cellulose) film with a photo-alignment film was obtained. The thickness of the photo-alignment film PA1 was 0.5 μm. ---------------------------------------------------------------------------------- Coating liquid PA1 for photo alignment film formation ---------------------------------------------------------------------------------- 100.00 parts by mass of the following polymer PA-1 8.25 parts by weight of the acid generator PAG-1 (listed below) 0.6 parts by weight of the following stabilizer DIPEA Xylene 1126.60 parts by mass Methyl isobutyl ketone 125.18 parts by mass ----------------------------------------------------------------------------------

[0088] Polymer PA-1 [ka]

[0089] Acid generator PAG-1 [ka]

[0090] Stabilizer DIPEA [ka]

[0091] [Preparation of optically absorbing anisotropic film P1] On the obtained photo-alignment film PA1, a composition P1 for forming an optically absorptive anisotropic film having the following composition was continuously applied with a #20 wire bar to form a coating layer P1. Next, the coating layer P1 was heated at 140° C. for 15 seconds, and then cooled to room temperature (23° C.). It was then heated at 75°C for 60 seconds and cooled again to room temperature. Then, an LED lamp (center wavelength 365 nm) was used, and the illuminance was 200 mW / cm 2 The coating layer P1 was irradiated with ultraviolet light for 2 seconds under the irradiation conditions of 1.5 to 3.0 s, thereby forming an optically absorptive anisotropic film P1 on the photo-alignment film PA1. The transmittance of the optically absorptive anisotropic film was measured using a spectrophotometer in the wavelength range of 280 nm to 780 nm, and the average visible light transmittance was 42%.

[0092] ---------------------------------------------------------------------------------- Composition of optically absorptive anisotropic film-forming composition P1 ---------------------------------------------------------------------------------- ·The following first dichroic substance C-1 (λmax 570nm) 0.65 parts by mass ·Second dichroic substance M-1 (λmax 466nm) 0.15 parts by mass below ·The following third dichroic substance Y-1 (λmax 417nm) 0.52 parts by mass 2.50 parts by mass of the following liquid crystal compound L-1 1.50 parts by mass of the following liquid crystal compound L-2 Polymerization initiator IRGACUREOXE-02 (BASF) 0.17 parts by mass 0.01 parts by mass of the following surfactant F-1 Cyclopentanone 46.07 parts by mass Tetrahydrofuran 46.07 parts by mass Benzyl alcohol 2.36 parts by mass ----------------------------------------------------------------------------------

[0093] Dichroic substance C-1 [ka]

[0094] Dichroic substance M-1 [ka]

[0095] Dichroic substance Y-1 [ka]

[0096] Liquid crystal compound L-1 [ka]

[0097] Liquid crystal compound L-2 [ka]

[0098] Surfactant F-1 [ka]

[0099] [Formation of Barrier Layer B1] A coating solution B1 having the following composition was continuously applied onto the optically absorptive anisotropic film P1 using a wire bar. The coating was then dried for 5 minutes with hot air at 80°C to obtain a laminate X1 having a barrier layer B1 made of polyvinyl alcohol (PVA) with a thickness of 1.0 μm, i.e., a polarizer POL1 having a cellulose acylate film 1 (transparent support), a photo-alignment film PA1, an optically absorptive anisotropic film P1, and a barrier layer B1 adjacent to each other in this order. ---------------------------------------------------------------------------------- Composition of coating solution B1 for forming barrier layer ---------------------------------------------------------------------------------- 3.80 parts by mass of the following modified polyvinyl alcohol Initiator Irg2959 0.20 parts by mass ·Water 70 parts by mass Methanol 30 parts by weight ----------------------------------------------------------------------------------

[0100] Modified Polyvinyl Alcohol [ka]

[0101] <Production of image display device> A transparent film (PMMA (polymethyl methacrylate)) with various images printed on it was layered on the surface of the light guide plate "Lightface" manufactured by Dai Nippon Printing Co., Ltd., and then the above-mentioned polarizer POL1 was attached to create an image display area without a bezel. A plurality of the image display units described above were fabricated, arranged side by side with no gaps between them, and fixed together to form the image display device of Example 1.

[0102] [Example 2] [Preparation of optically absorbing anisotropic film P2] On the above-mentioned photo-alignment film PA1, a composition P2 for forming an optically absorptive anisotropic film having the following composition was continuously applied with a #4 wire bar to form a coating layer P2. Next, the coating layer P2 was heated at 120° C. for 60 seconds, and then cooled to room temperature (23° C.). Then, a high-pressure mercury lamp was used to illuminate the area at an intensity of 28 mW / cm. 2 By irradiating for 60 seconds under the irradiation conditions, an optically absorptive anisotropic film P2 was formed on the photo-alignment film PA1.

[0103] ---------------------------------------------------------------------------------- Optically absorptive anisotropic layer forming composition liquid P2 ---------------------------------------------------------------------------------- 2.7 parts by mass of the following dichroic azo dye compound D6 2.7 parts by mass of the following dichroic azo dye compound D7 2.7 parts by mass of the following dichroic azo dye compound D8 ·The following liquid crystal compound M4 75.5 parts by mass Polymerization initiator IRGACURE819 (BASF) 0.8 parts by mass 0.6 parts by mass of the following interface improver F-2 Cyclopentanone 274.5 parts by mass Tetrahydrofuran 640.5 parts by mass ----------------------------------------------------------------------------------

[0104] Dichroic azo dye compound D6 [ka] Dichroic azo dye compound D7 [ka] Dichroic azo dye compound D8 [ka]

[0105] Liquid crystal compound M4 (compound A / compound B = 75 / 25 mixture) (Compound A) [ka] (Compound B) [ka]

[0106] Interface improver F-2 [ka]

[0107] [Formation of Barrier Layer B2] A barrier layer B2 was formed on the optically absorptive anisotropic film P2 in the same manner as the barrier layer B1 in Example 1, to obtain a polarizer POL2.

[0108] <Production of image display device> An image display device of Example 2 was produced in the same manner as in Example 1, except that the polarizer POL2 was used in place of the above-mentioned polarizer POL1.

[0109] [Comparative Example 1] <Production of image display device> An image display device of Comparative Example 1 was produced in the same manner as in Example 1, except that a general polarizer POL3 using PVA was used instead of the above-mentioned polarizer POL1.

[0110] [evaluation] The produced image display devices were evaluated as follows. [Deterioration of display performance] The produced image display device was placed in a thermostatic chamber at a temperature of 85° C. and a humidity of 85%, and was kept there for 100 hours. After removing it from the thermostatic chamber, the image display device was turned on, and the gaps between the image display sections were observed from a distance of 50 cm to evaluate the deterioration of display performance in the gaps. <Evaluation criteria for display performance degradation> A: The gap is barely visible, and the display performance is excellent. B: The gap is brighter than the rest of the area and is clearly visible.

[0111] [Deterioration of the polarizer edge] The polarizer was removed from the image display device after removal from the thermostatic chamber, and the transmittance Te [%] at a position 1 mm from the edge of the polarizer was measured using a polarimeter Axoscan manufactured by Axometrics. Similarly, the transmittance Tc [%] at a position 10 mm from the edge of the polarizer was measured. The obtained transmittance was used to evaluate the edge degradation of the polarizer according to the following formula. Edge deterioration=|Te-Tc|[%] The evaluation was made by averaging 10 random points. The results are shown in the table below.

[0112] [Table 1]

[0113] As shown in Table 1, in conventional image display devices using a general polarizer that uses PVA as a polarizer, the edges of the polarizer deteriorate after being left in a high-temperature, high-humidity environment, which causes noticeable gaps between adjacent image display areas and deteriorates display performance. That is, in a conventional image display device in which a plurality of image display units are arranged adjacent to each other, the edges of the image display surface must be located farther inward than the edges of the polarizers in consideration of deterioration of the edges of the polarizers due to moisture absorption, which results in a large gap between the image display surfaces of adjacent image display units, making the gap between the image display surfaces visible.

[0114] In contrast, the image display device of the present invention, which uses a polarizer containing a liquid crystal compound and a dichroic material, shows little deterioration at the edges of the polarizer even after being left in a high-temperature and high-humidity environment, and as a result, gaps between adjacent image display sections are not noticeable, i.e., the deterioration of display performance is small. Therefore, according to the present invention, in an image display device in which a plurality of image display units are arranged adjacent to each other, the edges of the image display screens can be brought close to the edges of the polarizers, thereby reducing the distance between the image display screens of adjacent image display units and preventing gaps between the image display screens from being visible. From the above results, the effects of the present invention are clear. [Industrial Applicability]

[0115] The present invention can be suitably used in foldable image display devices, multi-display devices, and the like. [Explanation of symbols]

[0116] 10,24 Image display devices 12A 1st image display section 12B Second image display unit 12C 1st image display section 12D 2nd image display section 12E Third image display section 12F 4th image display unit 12G 5th image display section 12H 6th image display section 14 Image display surface 16,104 Polarizer 20 Connecting member 100 Image display unit d-spacing

Claims

1. a plurality of image display units; a polarizer disposed on the image display surface side of the image display unit, The image display units are arranged adjacent to each other, the polarizer comprises at least one dichroic substance having a maximum absorption wavelength in the wavelength range of 370 nm or more and less than 500 nm, at least one dichroic substance having a maximum absorption wavelength in the wavelength range of 500 nm or more and less than 700 nm, and a liquid crystal compound; An image display device, characterized in that after being kept in an environment of a temperature of 85° C. and a humidity of 85% RH for 100 hours, the polarizer satisfies the following formula: |Te-Tc|<2.0[%] Te: transmittance [%] at a position 1 mm from the end of the image display unit Tc: transmittance [%] at a position 10 mm from the end of the image display unit

2. 2. The image display device according to claim 1, wherein the distance between the image display surfaces of the adjacent image display units is 1 mm or less.

3. 3. The image display device according to claim 1, wherein the interval between the image display surfaces of the adjacent image display units is equal to the interval between pixels in the image display device.

4. 4. The image display device according to claim 1, wherein the image display device can be bent between adjacent image display sections.

5. 5. The image display device according to claim 1, wherein the image display sections are arranged one-dimensionally or two-dimensionally.

6. The image display device according to claim 5 , wherein the image display unit is separable.

7. 7. The image display device according to claim 1, wherein the image display section is an organic electroluminescence display element.

8. 7. The image display device according to claim 1, wherein the image display unit is an LED display element or a micro LED display element.

9. 9. The image display device according to claim 1, wherein the liquid crystal compound is a polymer liquid crystal compound containing a repeating unit represented by the following formula (1): 【Chemistry 1】 In formula (1), P1 represents the main chain of the repeating unit, L1 represents a single bond or a divalent linking group, SP1 represents a spacer group, M1 represents a mesogenic group, and T1 represents a terminal group.

10. 10. The image display device according to claim 1, wherein the polarizer is formed using a polarizer-forming composition containing a dichroic material having a crosslinkable group.

Images