Organic electroluminescent display device

Abstract

To provide a bendable organic EL display device in which change in tint at a bending portion before and after bending is small.SOLUTION: The organic electroluminescent display device is a bendable organic electroluminescent display device including a circularly polarizing plate and a bendable organic EL display panel, in which the circularly polarizing plate includes a polarizer and a retardation layer from a viewing side, the retardation layer includes a first optically anisotropic layer formed by fixing a liquid crystal compound twist-aligned along a helical axis extending in a thickness direction, and the first optically anisotropic layer satisfies a predetermined requirement.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to an organic electroluminescent display device. [Background technology]

[0002] BACKGROUND ART Conventionally, circular polarizing plates have been used in organic electroluminescence display devices (hereinafter also referred to as "organic EL display devices") to suppress adverse effects caused by external light reflection. On the other hand, in recent years, there has been an increasing demand for flexible (bendable) organic EL display devices. However, when an organic EL display device is bent, a large force (partially tensile force and partially compressive force) is applied to the retardation film in the circular polarizer, causing changes in the retardation and slow axis angle of that portion. In response to the above-mentioned problems, Patent Document 1 provides a circular polarizing plate that includes a retardation film that exhibits predetermined optical properties and is adjusted so that the slow axis direction of the retardation film defines an angle of 20 to 70° with respect to the bending direction of the display device. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2014-170221 Summary of the Invention [Problem to be solved by the invention]

[0004] Meanwhile, in recent years, there has been a demand for further improvement in the visibility of display devices, and there is a demand for further reduction in color change at the bent portion before and after bending a bendable organic EL display device. The present inventors have investigated the characteristics of a bendable organic EL display device using the circular polarizer described in Patent Document 1, and have found that the change in color at the bent portion before and after bending the organic EL display device is large, and the level of color does not meet current requirements, so further improvement is necessary.

[0005] In view of the above circumstances, an object of the present invention is to provide a bendable organic EL display device in which there is little change in color at the bent portion before and after bending. [Means for solving the problem]

[0006] The present inventors have conducted extensive research to solve the above problems and have completed the present invention having the following configuration.

[0007] (1) A bendable organic electroluminescence display device including a circular polarizer and a bendable organic EL display panel, the circularly polarizing plate includes, from the viewing side, a polarizer and a retardation layer; the retardation layer includes a first optically anisotropic layer in which a liquid crystal compound is fixed and twisted along a helical axis extending in the thickness direction; The positions of the in-plane slow axis on the surface of the first optically anisotropic layer facing the organic electroluminescent display panel and the in-plane slow axis on the surface facing the polarizer are expressed as positive angle values ​​in the clockwise direction and negative angle values ​​in the counterclockwise direction with reference to the extension direction of a ridge line formed when the organic electroluminescent display device is bent when the organic electroluminescent display device is observed from the polarizer side, and An organic electroluminescent display device that satisfies any one of requirements A1 to A8 described below when the twist direction of the liquid crystal compound is expressed clockwise or counterclockwise based on the in-plane slow axis on the surface of the first optically anisotropic layer facing the organic electroluminescent display panel when the organic electroluminescent display device is observed from the polarizer side. (2) The organic electroluminescent display device according to (1), wherein the position of the absorption axis of the polarizer satisfies any one of requirements B1 to B8 described below when the position of the absorption axis of the polarizer is expressed as a positive angle value in the clockwise direction and a negative angle value in the counterclockwise direction relative to the extension direction of the ridge line formed when the organic electroluminescent display device is bent when the organic electroluminescent display device is observed from the polarizer side. (3) The organic electroluminescent display device according to (1) or (2), wherein the retardation layer includes a second optically anisotropic layer that is a negative A plate. (4) The organic electroluminescent display device according to any one of (1) to (3), wherein the retardation layer includes a third optically anisotropic layer that is a positive C plate. (5) The organic electroluminescent display device according to any one of (1) to (4), wherein the retardation layer includes a fourth optically anisotropic layer that is a negative C plate. (6) The organic electroluminescent display device according to any one of (1) to (5), wherein the retardation layer has a thickness of 20 μm or less. [Effects of the Invention]

[0008] According to the present invention, it is possible to provide a bendable organic EL display device in which there is little change in color at the bent portion before and after bending. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 10 is a diagram for explaining a ridge line direction. [Figure 2] FIG. 1 is a diagram for explaining problems with the prior art. [Figure 3] FIG. 2 is a diagram for explaining the mechanism of the present invention. [Figure 4] 1 is a cross-sectional view of an embodiment of an organic EL display device of the present invention. [Figure 5] FIG. 10 is a diagram for explaining an example of an aspect that satisfies requirement A1. [Figure 6] FIG. 10 is a diagram for explaining an example of an aspect that satisfies requirement A2. [Figure 7] FIG. 10 is a diagram for explaining an example of an aspect that satisfies requirement A3. [Figure 8] FIG. 10 is a diagram for explaining an example of an aspect that satisfies requirement A4. [Figure 9] FIG. 10 is a diagram for explaining an example of an aspect that satisfies requirement A5. [Figure 10] FIG. 10 is a diagram for explaining an example of an aspect that satisfies requirement A6. [Figure 11] FIG. 10 is a diagram for explaining an example of an aspect that satisfies requirement A7. [Figure 12] FIG. 10 is a diagram for explaining an example of an aspect that satisfies requirement A8. DETAILED DESCRIPTION OF THE INVENTION

[0010] The present invention will be described in detail below. The following description of the components may be based on representative embodiments of the present invention, but the present invention is not limited to such embodiments. In this specification, a numerical range expressed using "to" means a range that includes the numerical values ​​before and after "to" as the lower and upper limits. In this specification, "visible light" refers to 380 to 780 nm. In this specification, unless otherwise specified, the measurement wavelength is 550 nm. In this specification, the term "in-plane slow axis" refers to the direction in which the refractive index is maximum in the plane.

[0011] In the present invention, Re(λ) and Rth(λ) respectively represent the in-plane retardation and the thickness direction retardation at a wavelength λ, which is 550 nm unless otherwise specified. In the present invention, Re(λ) and Rth(λ) are values ​​measured at a wavelength λ using an AxoScan manufactured by Axometrics. By inputting the average refractive index ((nx+ny+nz) / 3) and film thickness (d (μm)) into AxoScan, Slow axis direction (°) Re(λ)=R0(λ) Rth(λ)=((nx+ny) / 2-nz)×d is calculated. Note that R0(λ) is displayed as a numerical value calculated by AxoScan, but it means Re(λ).

[0012] In this specification, the refractive indices nx, ny, and nz are measured using an Abbe refractometer (NAR-4T, manufactured by Atago Co., Ltd.) with a sodium lamp (λ=589 nm) as the light source. When measuring wavelength dependency, measurements can be made using a multi-wavelength Abbe refractometer DR-M2 (manufactured by Atago Co., Ltd.) in combination with an interference filter. Alternatively, values ​​from the Polymer Handbook (John Wiley & Sons, Inc.) and catalogs of various optical films can be used. Examples of average refractive index values ​​for major optical films are listed below: cellulose acylate (1.48), cycloolefin polymer (1.52), polycarbonate (1.59), polymethyl methacrylate (1.49), and polystyrene (1.59).

[0013] In this specification, "light" refers to actinic rays or radiation, such as the bright line spectrum of a mercury lamp, far ultraviolet rays represented by excimer lasers, extreme ultraviolet rays (EUV light: Extreme Ultraviolet), X-rays, ultraviolet rays, and electron beams (EB), etc. Of these, ultraviolet rays are preferred.

[0014] In addition, the bonding direction of the divalent group (e.g., —O—CO—) described in this specification is not particularly limited. 1 -L 2 -L 3 In the bond of L 2 When is -O-CO-, L 1 The position where it is bonded to the side is *1, L 3 If the position bonded to the side is *2, then L 2 may be *1-O-CO-*2 or *1-CO-O-*2.

[0015] In this specification, the A plate and the C plate are defined as follows. There are two types of A plates: positive A plates and negative A plates. When the refractive index in the in-plane slow axis direction (the direction in which the in-plane refractive index is greatest) of the film is nx, the refractive index in the in-plane direction perpendicular to the in-plane slow axis is ny, and the refractive index in the thickness direction is nz, the positive A plate satisfies the relationship in formula (A1), and the negative A plate satisfies the relationship in formula (A2). Note that the positive A plate has a positive Rth value, and the negative A plate has a negative Rth value. Formula (A1) nx>ny≒nz Formula (A2) ny <nx≒nz The above "≒" not only encompasses the case where the two are completely identical, but also the case where the two are substantially identical. For example, "substantially the same" means that "ny≒nz" ​​also includes the case where (ny-nz)×d (where d is the film thickness) is -10 to 10 nm, preferably -5 to 5 nm, and "nx≒nz" also includes the case where (nx-nz)×d is -10 to 10 nm, preferably -5 to 5 nm. There are two types of C plates: positive C plates and negative C plates. Positive C plates satisfy the relationship in formula (C1), while negative C plates satisfy the relationship in formula (C2). Note that positive C plates have a negative Rth value, while negative C plates have a positive Rth value. Formula (C1) nz>nx≒ny Formula (C2) nz <nx≒ny The above "≒" includes not only the case where the two are completely identical, but also the case where the two are substantially identical. For example, "substantially the same" also includes the case where (nx-ny)×d (where d is the thickness of the film) is 0 to 10 nm, preferably 0 to 5 nm, in "nx≒ny."

[0016] In this specification, "orthogonal" and "parallel" include the range of tolerance allowed in the technical field to which the present invention pertains. For example, it means being within a range of ±5° from the exact angle, and it is preferable that the tolerance from the exact angle be within a range of ±3°.

[0017] In this specification, the "fixed" state refers to a state in which the alignment of the liquid crystal compound is maintained. Specifically, it is preferable that the layer has no fluidity and the alignment is not changed by an external field or external force, usually in a temperature range of 0 to 50°C, or under more severe conditions, in a temperature range of -30 to 70°C, and that the fixed alignment can be stably maintained.

[0018] A characteristic feature of the present invention is that it uses a first optically anisotropic layer in which a liquid crystal compound is fixed that is twisted and aligned along a helical axis extending in the thickness direction, and that the in-plane slow axis of the first optically anisotropic layer is positioned at a predetermined position relative to the extension direction of the ridge line formed when the organic electroluminescent display device (hereinafter simply referred to as "organic EL display device") is bent. The estimated mechanism by which the effects of the present invention are obtained will be described below with reference to the drawings. First, the ridgeline direction will be described in more detail with reference to FIG. 1. FIG. 1 shows an example of a bent organic EL display device. As shown in FIG. 1, organic EL display device 100 has at least a flat portion 102 and a bent portion 104 that is connected to (separated from) the flat portion 102 via a linear bend start line L (boundary line). In FIG. 1, the ridgeline direction corresponds to the direction in which the ridgeline R of bent portion 104 of organic EL display device 100 extends (x direction in FIG. 1). In other words, the ridgeline direction refers to the direction in which the ridgeline (a line extending from peak to peak) formed at the bent portion extends when organic EL display device 100 is bent at the bent portion. The linear bending start line L is located at the end of the flat portion 102 and indicates the position where bending begins.

[0019] Next, we will explain what happens when an organic EL display device using the conventional retardation layer (retardation film) described in Patent Document 1 is bent. In Figure 2, the extension direction of the ridge line formed when the organic EL display device is bent is indicated by dashed line R. The conventional retardation layer is a uniaxially oriented layer, and has an in-plane slow axis in a predetermined direction as indicated by the black arrow in Figure 2. When the organic EL display device is bent, the retardation layer is stretched, and the in-plane slow axis moves in the direction of the white arrow to the position indicated by the dashed line. This causes a change in color near the bent part. In contrast, the present invention uses a first optically anisotropic layer in which liquid crystal compounds are fixed and twisted along a helical axis extending in the thickness direction. Because the liquid crystal compounds are twistedly oriented in the first optically anisotropic layer, the direction of the in-plane slow axis of the first optically anisotropic layer, indicated by the black arrow, gradually changes depending on the thickness position, as shown in Figure 3. Therefore, even if the organic EL display device is bent and the first optically anisotropic layer is stretched, the orientation directions are oriented in various directions, so stress is easily relaxed. As a result, the in-plane slow axis is less likely to shift in the direction of the white arrow as shown in Figure 2. Therefore, color changes are less likely to occur near the bent portion.

[0020] An embodiment of the organic EL display device of the present invention will be described below with reference to the drawings. Fig. 4 shows a cross-sectional view of an embodiment of the organic EL display device of the present invention. Note that the drawings in this invention are schematic diagrams, and the thickness relationships and positional relationships of the layers do not necessarily correspond to the actual ones. The same applies to the following drawings. The organic EL display device 10 includes, from the viewer side, a circular polarizer 12 and an organic EL display panel 14. The circular polarizer 12 includes, from the viewer side, a polarizer 16 and a retardation layer 18. The retardation layer 18 includes, from the viewer side, a fourth optically anisotropic layer 20, a second optically anisotropic layer 22, a first optically anisotropic layer 24, and a third optically anisotropic layer 26. The circular polarizer 12 is an optical element that converts unpolarized light into circularly polarized light. The fourth optically anisotropic layer 20, the second optically anisotropic layer 22, and the third optically anisotropic layer 26 are optional members and may not be included in the organic EL display device of the present invention. Furthermore, in the first embodiment, three optional components, namely, the fourth optical anisotropic layer 20, the second optical anisotropic layer 22, and the third optical anisotropic layer 26, are included, but, for example, it may be an embodiment in which only two components, the second optical anisotropic layer 22 and the third optical anisotropic layer 26, are included, or it may be an embodiment in which only one of the fourth optical anisotropic layer 20, the second optical anisotropic layer 22, and the third optical anisotropic layer 26 is included. In particular, when the organic EL display device before bending is viewed from the front and from an oblique direction, the difference in color between the two is small, so it is preferable that the organic EL display device includes at least the second optically anisotropic layer 22 and the third optically anisotropic layer 26, and it is more preferable that the organic EL display device includes the fourth optically anisotropic layer 20, the second optically anisotropic layer 22, and the third optically anisotropic layer 26. First, each component included in the organic EL display device will be described in detail below.

[0021] (polarizer) The polarizer 16 may be any member that has the function of converting natural light into specific linearly polarized light, and may be, for example, an absorptive polarizer. There are no particular limitations on the type of polarizer 16, and any commonly used polarizer can be used, such as an iodine-based polarizer, a dye-based polarizer using a dichroic material, and a polyene-based polarizer. Iodine-based polarizers and dye-based polarizers are generally produced by adsorbing iodine or a dichroic dye into polyvinyl alcohol and stretching it. A protective film may be disposed on one or both surfaces of the polarizer 16 .

[0022] The thickness of the polarizer 16 is not particularly limited, but is preferably 35 μm or less, and more preferably 1 to 25 μm, in terms of ease of handling and excellent optical properties. The above thickness allows for thinning of organic EL display devices.

[0023] (Fourth optically anisotropic layer 20) The fourth optically anisotropic layer 20 is a negative C plate. In FIG. 4, the fourth optically anisotropic layer 20 is disposed between the polarizer 16 and the second optically anisotropic layer 22. The in-plane retardation of the fourth optically anisotropic layer 20 at a wavelength of 550 nm is not particularly limited, but is preferably 0 to 10 nm, since this reduces the difference in color between the front and oblique directions when the organic EL display device before bending is viewed from the front and oblique directions. The retardation in the thickness direction of the fourth optically anisotropic layer 20 at a wavelength of 550 nm is not particularly limited, but is more preferably 15 to 60 nm, since this results in a smaller difference in color when the organic EL display device before bending is viewed from the front and from an oblique direction.

[0024] The fourth optically anisotropic layer 20 is not particularly limited in its configuration as long as it is a negative C plate, and may be a layer formed by fixing horizontally aligned discotic liquid crystal compounds. The state in which the discotic liquid crystal compound is horizontally aligned means that the discotic plane of the discotic liquid crystal compound is parallel to the surface of the layer, although strict parallelism is not required, and the angle between the discotic plane and the thickness direction of the layer is preferably in the range of 0±20°, more preferably 0±10°. As the discotic liquid crystal compound, known compounds can be used. Examples of discotic liquid crystal compounds include compounds described in paragraphs 0020 to 0067 of JP-A No. 2007-108732 and paragraphs 0013 to 0108 of JP-A No. 2010-244038. The discotic liquid crystal compound may have a polymerizable group. The type of polymerizable group is not particularly limited, and is preferably a functional group capable of undergoing an addition polymerization reaction, more preferably a polymerizable ethylenically unsaturated group or a ring-polymerizable group, and even more preferably a (meth)acryloyl group, a vinyl group, a styryl group, or an allyl group.

[0025] The fourth optically anisotropic layer 20 is preferably a layer formed by fixing a discotic liquid crystal compound having a polymerizable group by polymerization. More specifically, it is more preferably a layer formed by fixing a discotic liquid crystal compound having a polymerizable group that is horizontally aligned by polymerization.

[0026] The thickness of the fourth optically anisotropic layer 20 is not particularly limited, and is preferably 10 μm or less, more preferably 0.1 to 5.0 μm, and even more preferably 0.3 to 2.0 μm. The thickness of the fourth optically anisotropic layer 20 refers to the average thickness of the fourth optically anisotropic layer 20. The average thickness is determined by measuring the thickness at any five or more points of the fourth optically anisotropic layer 20 and calculating the arithmetic average.

[0027] (Second optically anisotropic layer 22) The second optically anisotropic layer 22 is a negative A plate. In FIG. 4, the second optically anisotropic layer 22 is disposed between the fourth optically anisotropic layer 20 and the first optically anisotropic layer 24. The in-plane retardation of the second optically anisotropic layer 22 at a wavelength of 550 nm is not particularly limited, but is preferably 70 to 200 nm, and more preferably 80 to 190 nm, in order to minimize the difference in color between the front and oblique directions when the organic EL display device before bending is viewed from the front and oblique directions. The retardation in the thickness direction of the second optically anisotropic layer 22 at a wavelength of 550 nm is not particularly limited, but is preferably −100 to −35 nm, and more preferably −95 to −40 nm, in order to minimize the difference in color between the front and oblique directions when the organic EL display device before bending is viewed from the front and oblique directions.

[0028] The second optically anisotropic layer 22 may exhibit either forward wavelength dispersion (a property in which in-plane retardation decreases as the measured wavelength increases) or reverse wavelength dispersion (a property in which in-plane retardation increases as the measured wavelength increases). Note that the forward wavelength dispersion and reverse wavelength dispersion are preferably exhibited in the visible light region.

[0029] The second optically anisotropic layer 22 is not particularly limited in its configuration as long as it is a negative A plate, and examples thereof include a layer in which a vertically aligned discotic liquid crystal compound is fixed, and whose optical axis (axis perpendicular to the disc surface) is aligned in the same direction, and a stretched film. Of these, a layer in which a vertically aligned discotic liquid crystal compound is fixed, and whose optical axis (axis perpendicular to the disc surface) is aligned in the same direction, is preferred, in that it results in less change in color at the bent portion before and after bending the organic EL display device (hereinafter, simply referred to as "the advantage of the present invention being better"). The state in which the discotic liquid crystal compound is vertically aligned means that the discotic plane of the discotic liquid crystal compound is parallel to the thickness direction of the layer, although strict parallelism is not required, and the angle between the discotic plane and the thickness direction of the layer is preferably in the range of 0±20°, more preferably 0±10°. Furthermore, the state in which the optical axes (axes perpendicular to the disc surface) of discotic liquid crystal compounds are aligned in the same direction does not require that they be aligned in the same direction strictly, but rather means that when the orientations of the slow axes are measured at any 20 positions within the plane, the maximum difference between the orientations of the slow axes at the 20 positions (the difference between the two slow axis orientations with the largest difference among the 20 slow axis orientations) is less than 10°. Known compounds can be used as the discotic liquid crystal compound. Specific examples of the discotic liquid crystal compound are as described above. The discotic liquid crystal compound may have a polymerizable group. The types of polymerizable groups that the discotic liquid crystal compound may have are as described above.

[0030] The second optically anisotropic layer 22 is preferably a layer formed by fixing, by polymerization, a discotic liquid crystal compound having a polymerizable group. More specifically, it is more preferably a layer formed by fixing, by polymerization, a discotic liquid crystal compound having a polymerizable group and vertically aligned with its optical axis aligned in the same direction.

[0031] The thickness of the second optically anisotropic layer 22 is not particularly limited, but is preferably 10 μm or less, more preferably 0.1 to 5.0 μm, and even more preferably 0.3 to 2.0 μm. The thickness of the second optically anisotropic layer 22 refers to the average thickness of the second optically anisotropic layer 22. The average thickness is determined by measuring the thickness at any five or more points of the second optically anisotropic layer 22 and calculating the arithmetic average.

[0032] (First optically anisotropic layer) The first optically anisotropic layer 24 is a layer in which liquid crystal compounds are fixed and twisted along a helical axis extending in the thickness direction. The first optically anisotropic layer 24 is preferably a layer formed by fixing a chiral nematic phase having a so-called helical structure. When forming the first optically anisotropic layer 24, it is preferable to use at least a liquid crystal compound and a chiral agent described later.

[0033] The twist angle of the liquid crystal compound (the twist angle of the alignment direction of the liquid crystal compound) is adjusted so as to satisfy the relationship of the in-plane slow axis described below. In terms of providing better effects of the present invention, the twist angle is preferably within the range of 85±30° (55 to 115°), and more preferably within the range of 85±15° (70 to 90°). The torsion angle is measured using an AxoScan (polarimeter) device manufactured by Axometrics and the device analysis software of the same company. Furthermore, the term "twisted alignment of the liquid crystal compound" means that the liquid crystal compound is twisted from one main surface to the other main surface of the first optically anisotropic layer 24 around an axis in the thickness direction of the first optically anisotropic layer 24. Accordingly, the alignment direction (in-plane slow axis direction) of the liquid crystal compound differs depending on the position in the thickness direction of the first optically anisotropic layer 24. When the liquid crystal compound is a rod-shaped liquid crystal compound, in the twisted orientation, the long axis of the rod-shaped liquid crystal compound is arranged parallel to the main surface of the first optically anisotropic layer 24. However, it is not required that they be strictly parallel, and the angle formed between the long axis of the liquid crystal compound and the main surface of the first optically anisotropic layer 24 is preferably in the range of 0±20°, and more preferably in the range of 0±10°.

[0034] The value of the product Δnd of the refractive index anisotropy Δn of the first optically anisotropic layer 24 at a wavelength of 550 nm and the thickness d of the first optically anisotropic layer 24 is not particularly limited, but is preferably 40 to 280 nm, and more preferably 100 to 200 nm, in order to minimize the difference in color between the two when the organic EL display device before bending is viewed from the front and from an oblique direction. The above Δnd is measured using an AxoScan (polarimeter) device from Axometrics and the device analysis software from the same company.

[0035] The angle between the in-plane slow axis of the second optically anisotropic layer 22 and the in-plane slow axis of the surface of the first optically anisotropic layer 24 facing the second optically anisotropic layer 22 is preferably 0 to 10°, more preferably 0 to 5°, in order to achieve better effects of the present invention. It is preferable that the above-mentioned angular relationship be satisfied in any of the cases of requirements A1 to A8 described below.

[0036] The type of liquid crystal compound used to form the first optically anisotropic layer 24 is not particularly limited, and examples thereof include known liquid crystal compounds, such as rod-shaped liquid crystal compounds and discotic liquid crystal compounds. Examples of the rod-shaped liquid crystal compound include those described in claim 1 of JP-A-11-513019 and paragraphs

[0026] to

[0098] of JP-A-2005-289980. Specific examples of the discotic liquid crystal compound are as described above. The liquid crystal compound may have a polymerizable group. The types of polymerizable groups that the liquid crystal compound may have are as described above.

[0037] The first optically anisotropic layer 24 is preferably a layer formed by fixing a liquid crystal compound having a polymerizable group by polymerization. More specifically, it is more preferably a layer formed by fixing a liquid crystal compound having a twistedly aligned polymerizable group by polymerization.

[0038] The thickness of the first optically anisotropic layer 24 is not particularly limited, but is preferably 10 μm or less, more preferably 0.1 to 5.0 μm, and even more preferably 0.3 to 2.0 μm. The thickness of the first optically anisotropic layer 24 refers to the average thickness of the first optically anisotropic layer 24. The average thickness is determined by measuring the thickness at any five or more points on the first optically anisotropic layer 24 and calculating the arithmetic average.

[0039] (Third optically anisotropic layer) The third optically anisotropic layer 26 is a positive C plate. In Fig. 4, the third optically anisotropic layer 26 is disposed between the first optically anisotropic layer 24 and the organic EL display panel 14. The in-plane retardation of the third optically anisotropic layer 26 at a wavelength of 550 nm is not particularly limited, but is preferably 0 to 10 nm, since this reduces the difference in color between the front and oblique directions when the organic EL display device before bending is viewed from the front and oblique directions. The retardation in the thickness direction of the third optically anisotropic layer 26 at a wavelength of 550 nm is not particularly limited, but is preferably −120 to −10 nm, and more preferably −100 to −30 nm, in order to minimize the difference in color between the front and oblique directions when the organic EL display device before bending is viewed from the front and oblique directions.

[0040] The third optically anisotropic layer 26 is not particularly limited in its configuration as long as it is a positive C plate, and may be a layer in which vertically aligned rod-like liquid crystal compounds are fixed. The vertical alignment of the rod-shaped liquid crystal compounds means that the long axes of the rod-shaped liquid crystal compounds are parallel to the thickness direction of the layer. However, strict parallelism is not required, and the angle between the disc surface and the thickness direction of the layer is preferably in the range of 0±20°, more preferably 0±10°. As the rod-shaped liquid crystal compound, known compounds can be used. Specific examples of the rod-shaped liquid crystal compound are as described above. The rod-shaped liquid crystal compound may have a polymerizable group. The type of polymerizable group that the rod-shaped liquid crystal compound may have is not particularly limited, and is as described above.

[0041] The third optically anisotropic layer 26 is preferably a layer formed by fixing a rod-shaped liquid crystal compound having a polymerizable group by polymerization. More specifically, it is more preferably a layer formed by fixing a rod-shaped liquid crystal compound having a vertically aligned polymerizable group by polymerization.

[0042] The thickness of the third optically anisotropic layer 26 is not particularly limited, but is preferably 10 μm or less, more preferably 0.1 to 5.0 μm, and even more preferably 0.3 to 2.0 μm. The thickness of the third optically anisotropic layer 26 refers to the average thickness of the third optically anisotropic layer 26. The average thickness is determined by measuring the thickness at any five or more points of the third optically anisotropic layer 26 and calculating the arithmetic average.

[0043] (organic EL display panel) The organic EL display panel 14 is a bendable panel. Generally, bendable organic EL display panels can be bent in a specific direction. Such organic EL display panel 14 can be an organic EL display panel with a known configuration, and typically has a structure in which an organic light-emitting layer (organic electroluminescence layer) is sandwiched between electrodes (a cathode and an anode).

[0044] (Other layers) The organic EL display device of the present invention may have layers other than the above-mentioned members. The other members include an adhesive layer. The organic EL display device of the present invention may have an adhesive layer between each of the members. Examples of the adhesive layer include known pressure-sensitive adhesive layers and adhesive layers.

[0045] Further, the other members include an alignment film. The alignment layer can be formed by means of rubbing an organic compound (preferably a polymer), oblique evaporation of an inorganic compound, formation of a layer with microgrooves, or deposition of an organic compound (e.g., ω-tricosanoic acid, dioctadecylmethylammonium chloride, methyl stearate) by the Langmuir-Blodgett technique (LB film). Furthermore, alignment films are also known that exhibit alignment functions when an electric field is applied, a magnetic field is applied, or light (preferably polarized light) is irradiated. The alignment film is preferably formed by rubbing a polymer. The alignment film may also be a photo-alignment film. The thickness of the alignment film is not particularly limited as long as it can exhibit an alignment function, but is preferably 0.01 to 5.0 μm, more preferably 0.05 to 2.0 μm, and even more preferably 0.1 to 0.5 μm. The alignment film may be peelable from the retardation layer together with the substrate described below.

[0046] (phase contrast layer) The organic EL display device 10 includes a retardation layer 18 including the first to fourth optically anisotropic layers 24 to 20 described above. The thickness of the retardation layer 18 is not particularly limited, but from the viewpoint of thinning the organic EL display device, it is preferably 20 μm or less, more preferably 10 μm or less. There is no particular lower limit, but it is often 1.0 μm or more. When an adhesive layer is included between each of the first to fourth optically anisotropic layers 24 to 20, the thickness of the retardation layer 18 includes the thickness of the adhesive layer.

[0047] The retardation layer 18 preferably functions as a so-called λ / 4 plate. A λ / 4 plate is a plate that has the function of converting linearly polarized light of a specific wavelength into circularly polarized light (or circularly polarized light into linearly polarized light). More specifically, it is a plate that exhibits an in-plane retardation Re of λ / 4 (or an odd multiple thereof) at a specific wavelength λnm. The in-plane retardation (Re(550)) of the retardation layer 18 at a wavelength of 550 nm may have an error of about 25 nm around the ideal value (137.5 nm), and is preferably 110 to 160 nm, and more preferably 120 to 150 nm, for example.

[0048] (Axial relationship in organic EL display devices) Next, the positional relationship of the in-plane slow axis of the first optically anisotropic layer 24 included in the organic EL display device 10 will be described. The organic EL display device 10 only needs to satisfy one of the requirements A1 to A8 described below. Among these, it is preferable that the organic EL display device 10 satisfies one of the requirements A1, A2, A5, and A6, in order to obtain better effects of the present invention. Each requirement will be explained in detail below using drawings.

[0049] [Requirement A1] FIG. 5 is a diagram for explaining an example of an embodiment that satisfies requirement A1, and shows the relationship between the angle between the ridgeline R (dashed line) formed when the organic EL display device 10 is bent at the bending portion, the in-plane slow axis SX (solid line) on the surface of the first optically anisotropic layer 24 facing the organic EL display panel 14, and the in-plane slow axis SY (solid line) on the surface of the first optically anisotropic layer 24 facing the polarizer 16, when the organic EL display device 10 is observed from the white arrow in FIG. FIG. 5 also shows a ridgeline R that is formed when the organic EL display device 10 is bent at a bend. When observing the organic EL display device 10 from the white arrow in Figure 4, the position (rotation angle) of the in-plane slow axis is expressed as a positive angle value in the clockwise direction and a negative angle value in the counterclockwise direction, with the extension direction of the ridge line R as the reference (0°). Furthermore, when observing the organic EL display device 10 from the white arrow in Figure 4, the twist direction of the liquid crystal compound is determined to be clockwise or counterclockwise based on the in-plane slow axis on the surface of the first optically anisotropic layer 24 facing the organic EL display panel.

[0050] In one example of an embodiment that satisfies requirement A1, the angle θX1 between the in-plane slow axis SX on the surface of the first optically anisotropic layer 24 facing the organic EL display panel 14 and the extending direction of the ridge line R is 5°, as shown in Fig. 5. More specifically, the in-plane slow axis SX on the surface of the first optically anisotropic layer 24 facing the organic EL display panel 14 is positioned at -5° with respect to the extending direction of the ridge line R. Note that Fig. 5 shows an embodiment in which the in-plane slow axis SX on the surface of the first optically anisotropic layer 24 facing the organic EL display panel 14 is positioned at -5° with respect to the extending direction of the ridge line R, but the present embodiment is not limited to this embodiment, and the in-plane slow axis SX on the surface of the first optically anisotropic layer 24 facing the organic EL display panel 14 is preferably positioned within a range of -20 to 10°, and more preferably within a range of -10 to 0°, with respect to the extending direction of the ridge line R. The angle θY1 between the in-plane slow axis SY on the surface of the first optically anisotropic layer 24 facing the polarizer 16 and the extending direction of the ridge line R is 76°. More specifically, the in-plane slow axis SY on the surface of the first optically anisotropic layer 24 facing the polarizer 16 is positioned at 76° with respect to the extending direction of the ridge line R. Note that, although FIG. 5 shows an embodiment in which the in-plane slow axis SY on the surface of the first optically anisotropic layer 24 facing the polarizer 16 is positioned at 76° with respect to the extending direction of the ridge line R, the present embodiment is not limited to this embodiment, and the in-plane slow axis SY on the surface of the first optically anisotropic layer 24 facing the polarizer 16 is preferably positioned within a range of 65 to 95°, and more preferably within a range of 75 to 85°, with respect to the extending direction of the ridge line R. In addition, in FIG. 5, the twist direction of the liquid crystal compound is clockwise (see the dashed arrow).

[0051] In other words, it is preferable that the organic EL display device 10 satisfy the following requirement A1. Requirement A1: The in-plane slow axis of the first optically anisotropic layer on the surface facing the organic EL display panel is located in the range of -20 to 10°, the in-plane slow axis of the first optically anisotropic layer on the surface facing the polarizer is located in the range of 65 to 95°, and the twist direction of the liquid crystal compound is clockwise.

[0052] Furthermore, when requirement A1 is satisfied, when the organic EL display device 10 is observed from the polarizer 16 side, the absorption axis of the polarizer 16 is preferably positioned within a range of -10 to 10°, and more preferably within a range of -5 to 5°, when expressed as a positive angle value in the clockwise direction and a negative angle value in the counterclockwise direction based on the extension direction of the ridge line R formed when the organic EL display device is bent. In other words, it is preferable that the organic EL display device 10 satisfy the following requirement B1. Requirement B1: Requirement A1 is satisfied, and the absorption axis of the polarizer is located within the range of −10 to 10°.

[0053] [Requirement A2] FIG. 6 is a diagram for explaining an example of an embodiment that satisfies requirement A2, and shows the relationship between the ridgeline R (dashed line) formed when the organic EL display device 10 is bent at the bending portion, the in-plane slow axis SX (solid line) on the surface of the first optically anisotropic layer 24 facing the organic EL display panel 14, and the in-plane slow axis SY (solid line) on the surface of the first optically anisotropic layer 24 facing the polarizer 16, when the organic EL display device 10 is observed from the white arrow in FIG. FIG. 6 also shows a ridgeline R that is formed when the organic EL display device 10 is bent at a bend. When observing the organic EL display device 10 from the white arrow in Figure 4, the position (rotation angle) of the in-plane slow axis is expressed as a positive angle value in the clockwise direction and a negative angle value in the counterclockwise direction, with the extension direction of the ridge line R as the reference (0°). Furthermore, when observing the organic EL display device 10 from the white arrow in Figure 4, the twist direction of the liquid crystal compound is determined to be clockwise or counterclockwise based on the in-plane slow axis on the surface of the first optically anisotropic layer 24 facing the organic EL display panel.

[0054] In one example of an embodiment that satisfies requirement A2, the angle θX2 between the in-plane slow axis SX on the surface of the first optically anisotropic layer 24 facing the organic EL display panel 14 and the extending direction of the ridge line R is 95°, as shown in Fig. 6. More specifically, the in-plane slow axis SX on the surface of the first optically anisotropic layer 24 facing the organic EL display panel 14 is positioned at -95° with respect to the extending direction of the ridge line R. Note that Fig. 6 shows an embodiment in which the in-plane slow axis SX on the surface of the first optically anisotropic layer 24 facing the organic EL display panel 14 is positioned at -95° with respect to the extending direction of the ridge line R, but the present embodiment is not limited to this embodiment, and the in-plane slow axis SX on the surface of the first optically anisotropic layer 24 facing the organic EL display panel 14 is preferably positioned within a range of -110 to -80°, and more preferably within a range of -100 to -90°, with respect to the extending direction of the ridge line R. The angle θY2 between the in-plane slow axis SY on the surface of the first optically anisotropic layer 24 facing the polarizer 16 and the extending direction of the ridge line R is 14°. More specifically, the in-plane slow axis SY on the surface of the first optically anisotropic layer 24 facing the polarizer 16 is positioned at −14° with respect to the extending direction of the ridge line R. Note that, although FIG. 6 shows an embodiment in which the in-plane slow axis SY on the surface of the first optically anisotropic layer 24 facing the polarizer 16 is positioned at −14° with respect to the extending direction of the ridge line R, the present embodiment is not limited to this embodiment, and the in-plane slow axis SY on the surface of the first optically anisotropic layer 24 facing the polarizer 16 is preferably positioned within a range of −25 to 5°, and more preferably within a range of −15 to −5°, with respect to the extending direction of the ridge line R. In addition, in FIG. 6, the twist direction of the liquid crystal compound is clockwise (see the dashed arrow).

[0055] In other words, it is preferable that the organic EL display device 10 satisfy the following requirement A2. Requirement A2: The in-plane slow axis of the first optically anisotropic layer on the surface facing the organic EL display panel is located in the range of -110 to -80°, the in-plane slow axis of the first optically anisotropic layer on the surface facing the polarizer is located in the range of -25 to 5°, and the twist direction of the liquid crystal compound is clockwise.

[0056] Furthermore, when requirement A2 is satisfied, when the organic EL display device 10 is observed from the polarizer 16 side, the absorption axis of the polarizer 16 is preferably positioned within a range of 80 to 100°, and more preferably within a range of 85 to 95°, when expressed as a positive angle value in the clockwise direction and a negative angle value in the counterclockwise direction, based on the extension direction of the ridge line R formed when the organic EL display device is bent. In other words, it is preferable that the organic EL display device 10 satisfy the following requirement B2. Requirement B2: Requirement A2 is satisfied, and the absorption axis of the polarizer is located within the range of 80 to 100°.

[0057] [Requirement A3] FIG. 7 is a diagram for explaining an example of an embodiment that satisfies requirement A3, and shows the relationship between the angle between the ridgeline R (dashed line) formed when the organic EL display device 10 is bent at the bending portion, the in-plane slow axis SX (solid line) on the surface of the first optically anisotropic layer 24 facing the organic EL display panel 14, and the in-plane slow axis SY (solid line) on the surface of the first optically anisotropic layer 24 facing the polarizer 16, when the organic EL display device 10 is observed from the white arrow in FIG. FIG. 7 also shows a ridgeline R that is formed when the organic EL display device 10 is bent at a bend. When observing the organic EL display device 10 from the white arrow in Figure 4, the position (rotation angle) of the in-plane slow axis is expressed as a positive angle value in the clockwise direction and a negative angle value in the counterclockwise direction, with the extension direction of the ridge line R as the reference (0°). Furthermore, when observing the organic EL display device 10 from the white arrow in Figure 4, the twist direction of the liquid crystal compound is determined to be clockwise or counterclockwise based on the in-plane slow axis on the surface of the first optically anisotropic layer 24 facing the organic EL display panel.

[0058] In one example of an embodiment that satisfies requirement A3, the angle θX3 between the in-plane slow axis SX on the surface of the first optically anisotropic layer 24 facing the organic EL display panel 14 and the extending direction of the ridge line R is 50°, as shown in Fig. 7. More specifically, the in-plane slow axis SX on the surface of the first optically anisotropic layer 24 facing the organic EL display panel 14 is positioned at -50° with respect to the extending direction of the ridge line R. Note that Fig. 7 shows an embodiment in which the in-plane slow axis SX on the surface of the first optically anisotropic layer 24 facing the organic EL display panel 14 is positioned at -50° with respect to the extending direction of the ridge line R, but the present embodiment is not limited to this embodiment, and the in-plane slow axis SX on the surface of the first optically anisotropic layer 24 facing the organic EL display panel 14 is preferably positioned within a range of -65 to -35°, and more preferably within a range of -55 to -45°, with respect to the extending direction of the ridge line R. The angle θY3 between the in-plane slow axis SY on the surface of the first optically anisotropic layer 24 facing the polarizer 16 and the extending direction of the ridge line R is 31°. More specifically, the in-plane slow axis SY on the surface of the first optically anisotropic layer 24 facing the polarizer 16 is positioned at 31° with respect to the extending direction of the ridge line R. Note that, although FIG. 7 shows an embodiment in which the in-plane slow axis SY on the surface of the first optically anisotropic layer 24 facing the polarizer 16 is positioned at 31° with respect to the extending direction of the ridge line R, the present embodiment is not limited to this embodiment, and the in-plane slow axis SY on the surface of the first optically anisotropic layer 24 facing the polarizer 16 is preferably positioned within a range of 20 to 50°, and more preferably within a range of 30 to 40°, with respect to the extending direction of the ridge line R. In addition, in FIG. 7, the twist direction of the liquid crystal compound is clockwise.

[0059] In other words, it is preferable that the organic EL display device 10 satisfy the following requirement A3. Requirement A3: The in-plane slow axis of the first optically anisotropic layer on the surface facing the organic EL display panel is located within a range of -65 to -35°, the in-plane slow axis of the first optically anisotropic layer on the surface facing the polarizer is located within a range of 20 to 50°, and the twist direction of the liquid crystal compound is clockwise.

[0060] Furthermore, when requirement A3 is satisfied, when the organic EL display device 10 is observed from the polarizer 16 side, the absorption axis of the polarizer 16 is preferably located within a range of -55 to -35°, and more preferably within a range of -50 to -40°, when expressed as a positive angle value in the clockwise direction and a negative angle value in the counterclockwise direction based on the extension direction of the ridge line R formed when the organic EL display device is bent. In other words, it is preferable that the organic EL display device 10 satisfy the following requirement B3. Requirement B3: Requirement A3 is satisfied, and the absorption axis of the polarizer is located within the range of −55 to −35°.

[0061] [Requirement A4] FIG. 8 is a diagram for explaining an example of an embodiment that satisfies requirement A4, and shows the relationship between the ridgeline R (dashed line) formed when the organic EL display device 10 is bent at the bending portion, the in-plane slow axis SX (solid line) on the surface of the first optically anisotropic layer 24 facing the organic EL display panel 14, and the in-plane slow axis SY (solid line) on the surface of the first optically anisotropic layer 24 facing the polarizer 16, when the organic EL display device 10 is observed from the white arrow in FIG. FIG. 8 also shows a ridgeline R that is formed when the organic EL display device 10 is bent at a bend. When observing the organic EL display device 10 from the white arrow in Figure 4, the position (rotation angle) of the in-plane slow axis is expressed as a positive angle value in the clockwise direction and a negative angle value in the counterclockwise direction, with the extension direction of the ridge line R as the reference (0°). Furthermore, when observing the organic EL display device 10 from the white arrow in Figure 4, the twist direction of the liquid crystal compound is determined to be clockwise or counterclockwise based on the in-plane slow axis on the surface of the first optically anisotropic layer 24 facing the organic EL display panel.

[0062] In one example of an embodiment that satisfies requirement A4, the angle θX4 formed between the in-plane slow axis SX on the surface of the first optically anisotropic layer 24 facing the organic EL display panel 14 and the extending direction of the ridge line R is 40°, as shown in Fig. 8. More specifically, the in-plane slow axis SX on the surface of the first optically anisotropic layer 24 facing the organic EL display panel 14 is positioned at 40° with respect to the extending direction of the ridge line R. Note that Fig. 8 shows an embodiment in which the in-plane slow axis SX on the surface of the first optically anisotropic layer 24 facing the organic EL display panel 14 is positioned at 40° with respect to the extending direction of the ridge line R, but the present embodiment is not limited to this embodiment, and the in-plane slow axis SX on the surface of the first optically anisotropic layer 24 facing the organic EL display panel 14 is preferably positioned within a range of 25 to 55°, and more preferably within a range of 35 to 45°, with respect to the extending direction of the ridge line R. The angle θY4 between the in-plane slow axis SY on the surface of the first optically anisotropic layer 24 facing the polarizer 16 and the extending direction of the ridge line R is 121°. More specifically, the in-plane slow axis SY on the surface of the first optically anisotropic layer 24 facing the polarizer 16 is positioned at 121° with respect to the extending direction of the ridge line R. Note that, although FIG. 8 shows an embodiment in which the in-plane slow axis SY on the surface of the first optically anisotropic layer 24 facing the polarizer 16 is positioned at 121° with respect to the extending direction of the ridge line R, the present embodiment is not limited to this embodiment, and the in-plane slow axis SY on the surface of the first optically anisotropic layer 24 facing the polarizer 16 is preferably positioned within a range of 110 to 140°, and more preferably within a range of 120 to 130°, with respect to the extending direction of the ridge line R. In addition, in FIG. 8, the twist direction of the liquid crystal compound is clockwise.

[0063] In other words, it is preferable that the organic EL display device 10 satisfy the following requirement A4. Requirement A4: The in-plane slow axis of the first optically anisotropic layer on the surface facing the organic EL display panel is located within a range of 25 to 55°, the in-plane slow axis of the first optically anisotropic layer on the surface facing the polarizer is located within a range of 110 to 140°, and the twist direction of the liquid crystal compound is clockwise.

[0064] Furthermore, when requirement A4 is satisfied, when the organic EL display device 10 is observed from the polarizer 16 side, the absorption axis of the polarizer 16 is preferably positioned within a range of 35 to 55°, and more preferably within a range of 40 to 50°, when expressed as a positive angle value in the clockwise direction and a negative angle value in the counterclockwise direction, based on the extension direction of the ridge line R formed when the organic EL display device is bent. In other words, it is preferable that the organic EL display device 10 satisfy the following requirement B4. Requirement B4: Requirement A4 is satisfied, and the absorption axis of the polarizer is located within the range of 35 to 55°.

[0065] [Requirement A5] FIG. 9 is a diagram for explaining an example of an embodiment that satisfies requirement A5, and shows the relationship between the ridgeline R (dashed line) formed when the organic EL display device 10 is bent at the bending portion, the in-plane slow axis SX (solid line) on the surface of the first optically anisotropic layer 24 facing the organic EL display panel 14, and the in-plane slow axis SY (solid line) on the surface of the first optically anisotropic layer 24 facing the polarizer 16, when the organic EL display device 10 is observed from the white arrow in FIG. FIG. 9 also shows a ridgeline R that is formed when the organic EL display device 10 is bent at a bend. When observing the organic EL display device 10 from the white arrow in Figure 4, the position (rotation angle) of the in-plane slow axis is expressed as a positive angle value in the clockwise direction and a negative angle value in the counterclockwise direction, with the extension direction of the ridge line R as the reference (0°). Furthermore, when observing the organic EL display device 10 from the white arrow in Figure 4, the twist direction of the liquid crystal compound is determined to be clockwise or counterclockwise based on the in-plane slow axis on the surface of the first optically anisotropic layer 24 facing the organic EL display panel.

[0066] In one example of an embodiment that satisfies requirement A5, the angle θX5 between the in-plane slow axis SX on the surface of the first optically anisotropic layer 24 facing the organic EL display panel 14 and the extending direction of the ridge line R is 5°, as shown in Fig. 9. More specifically, the in-plane slow axis SX on the surface of the first optically anisotropic layer 24 facing the organic EL display panel 14 is positioned at 5° with respect to the extending direction of the ridge line R. Note that Fig. 9 shows an embodiment in which the in-plane slow axis SX on the surface of the first optically anisotropic layer 24 facing the organic EL display panel 14 is positioned at 5° with respect to the extending direction of the ridge line R, but the present embodiment is not limited to this embodiment, and the in-plane slow axis SX on the surface of the first optically anisotropic layer 24 facing the organic EL display panel 14 is preferably positioned within a range of -10 to 20°, and more preferably within a range of 0 to 10°, with respect to the extending direction of the ridge line R. The angle θY5 between the in-plane slow axis SY on the surface of the first optically anisotropic layer 24 facing the polarizer 16 and the extending direction of the ridge line R is 80°. More specifically, the in-plane slow axis SY on the surface of the first optically anisotropic layer 24 facing the polarizer 16 is positioned at −80° with respect to the extending direction of the ridge line R. Note that, although FIG. 9 shows an embodiment in which the in-plane slow axis SY on the surface of the first optically anisotropic layer 24 facing the polarizer 16 is positioned at −80° with respect to the extending direction of the ridge line R, the present embodiment is not limited to this embodiment, and the in-plane slow axis SY on the surface of the first optically anisotropic layer 24 facing the polarizer 16 is preferably positioned within a range of −95 to −65°, and more preferably within a range of −85 to −75°, with respect to the extending direction of the ridge line R. In addition, in FIG. 9, the twist direction of the liquid crystal compound is counterclockwise.

[0067] In other words, it is preferable that the organic EL display device 10 satisfy the following requirement A5. Requirement A5: The in-plane slow axis of the first optically anisotropic layer on the surface facing the organic electroluminescent display panel is located within a range of -10 to 20°, the in-plane slow axis of the first optically anisotropic layer on the surface facing the polarizer is located within a range of -95 to -65°, and the twist direction of the liquid crystal compound is counterclockwise.

[0068] Furthermore, when requirement A5 is satisfied, when the organic EL display device 10 is observed from the polarizer 16 side, the absorption axis of the polarizer 16 is preferably located within a range of -10 to 10°, and more preferably within a range of -5 to 5°, when expressed as a positive angle value in the clockwise direction and a negative angle value in the counterclockwise direction based on the extension direction of the ridge line R formed when the organic EL display device is bent. In other words, it is preferable that the organic EL display device 10 satisfy the following requirement B5. Requirement B5: Requirement A5 is satisfied, and the absorption axis of the polarizer is located within the range of −10 to 10°.

[0069] [Requirement A6] FIG. 10 is a diagram for explaining an example of an embodiment that satisfies requirement A6, and shows the relationship between the ridgeline R (dashed line) formed when the organic EL display device 10 is bent at the bending portion, the in-plane slow axis SX (solid line) on the surface of the first optically anisotropic layer 24 facing the organic EL display panel 14, and the in-plane slow axis SY (solid line) on the surface of the first optically anisotropic layer 24 facing the polarizer 16, when the organic EL display device 10 is observed from the white arrow in FIG. FIG. 10 also shows a ridgeline R that is formed when the organic EL display device 10 is bent at a bent portion. When observing the organic EL display device 10 from the white arrow in Figure 4, the position (rotation angle) of the in-plane slow axis is expressed as a positive angle value in the clockwise direction and a negative angle value in the counterclockwise direction, with the extension direction of the ridge line R as the reference (0°). Furthermore, when observing the organic EL display device 10 from the white arrow in Figure 4, the twist direction of the liquid crystal compound is determined to be clockwise or counterclockwise based on the in-plane slow axis on the surface of the first optically anisotropic layer 24 facing the organic EL display panel.

[0070] In one example of an embodiment that satisfies requirement A6, the angle θX6 formed between the in-plane slow axis SX on the surface of the first optically anisotropic layer 24 facing the organic EL display panel 14 and the extending direction of the ridge line R is 95°, as shown in Fig. 10. More specifically, the in-plane slow axis SX on the surface of the first optically anisotropic layer 24 facing the organic EL display panel 14 is positioned at 95° with respect to the extending direction of the ridge line R. Note that Fig. 10 shows an embodiment in which the in-plane slow axis SX on the surface of the first optically anisotropic layer 24 facing the organic EL display panel 14 is positioned at 95° with respect to the extending direction of the ridge line R, but the present embodiment is not limited to this embodiment. The in-plane slow axis SX on the surface of the first optically anisotropic layer 24 facing the organic EL display panel 14 is preferably positioned within a range of 80 to 110°, and more preferably within a range of 90 to 100°, with respect to the extending direction of the ridge line R. The angle θY6 between the in-plane slow axis SY on the surface of the first optically anisotropic layer 24 facing the polarizer 16 and the extending direction of the ridge line R is 10°. More specifically, the in-plane slow axis SY on the surface of the first optically anisotropic layer 24 facing the polarizer 16 is positioned at 10° with respect to the extending direction of the ridge line R. Note that, although FIG. 10 shows an embodiment in which the in-plane slow axis SY on the surface of the first optically anisotropic layer 24 facing the polarizer 16 is positioned at 10° with respect to the extending direction of the ridge line R, the present embodiment is not limited to this embodiment, and the in-plane slow axis SY on the surface of the first optically anisotropic layer 24 facing the polarizer 16 is preferably positioned within a range of −5 to 25°, and more preferably within a range of 5 to 15°, with respect to the extending direction of the ridge line R. In addition, in FIG. 10, the twist direction of the liquid crystal compound is counterclockwise.

[0071] In other words, it is preferable that the organic EL display device 10 satisfy the following requirement A6. Requirement A6: The in-plane slow axis of the first optically anisotropic layer on the surface facing the organic EL display panel is located in the range of 80 to 110°, the in-plane slow axis of the first optically anisotropic layer on the surface facing the polarizer is located in the range of -5 to 25°, and the twist direction of the liquid crystal compound is counterclockwise.

[0072] Furthermore, when requirement A6 is satisfied, when the organic EL display device 10 is observed from the polarizer 16 side, the absorption axis of the polarizer 16 is preferably positioned within a range of 80 to 100°, and more preferably within a range of 85 to 95°, when expressed as a positive angle value in the clockwise direction and a negative angle value in the counterclockwise direction, based on the extension direction of the ridge line R formed when the organic EL display device is bent. In other words, it is preferable that the organic EL display device 10 satisfy the following requirement B6. Requirement B6: Requirement A6 is satisfied, and the absorption axis of the polarizer is located within the range of 80 to 100°.

[0073] [Requirement A7] FIG. 11 is a diagram for explaining an example of an embodiment that satisfies requirement A7, and shows the relationship between the ridgeline R (dashed line) formed when the organic EL display device 10 is bent at the bending portion, the in-plane slow axis SX (solid line) on the surface of the first optically anisotropic layer 24 facing the organic EL display panel 14, and the in-plane slow axis SY (solid line) on the surface of the first optically anisotropic layer 24 facing the polarizer 16, when the organic EL display device 10 is observed from the white arrow in FIG. FIG. 11 also shows a ridgeline R that is formed when the organic EL display device 10 is bent at a bent portion. When observing the organic EL display device 10 from the white arrow in Figure 4, the position (rotation angle) of the in-plane slow axis is expressed as a positive angle value in the clockwise direction and a negative angle value in the counterclockwise direction, with the extension direction of the ridge line R as the reference (0°). Furthermore, when observing the organic EL display device 10 from the white arrow in Figure 4, the twist direction of the liquid crystal compound is determined to be clockwise or counterclockwise based on the in-plane slow axis on the surface of the first optically anisotropic layer 24 facing the organic EL display panel.

[0074] 11 , in one example of an embodiment that satisfies requirement A7, the angle θX7 formed between the in-plane slow axis SX on the surface of the first optically anisotropic layer 24 facing the organic EL display panel 14 and the extending direction of the ridge line R is 40°. More specifically, the in-plane slow axis SX on the surface of the first optically anisotropic layer 24 facing the organic EL display panel 14 is positioned at −40° with respect to the extending direction of the ridge line R. Note that FIG. 11 shows an embodiment in which the in-plane slow axis SX on the surface of the first optically anisotropic layer 24 facing the organic EL display panel 14 is positioned at −40° with respect to the extending direction of the ridge line R, but the present embodiment is not limited to this embodiment, and the in-plane slow axis SX on the surface of the first optically anisotropic layer 24 facing the organic EL display panel 14 is preferably positioned within a range of −55 to −25°, and more preferably within a range of −45 to −35°, with respect to the extending direction of the ridge line R. The angle θY7 between the in-plane slow axis SY on the surface of the first optically anisotropic layer 24 facing the polarizer 16 and the extending direction of the ridge line R is 125°. More specifically, the in-plane slow axis SY on the surface of the first optically anisotropic layer 24 facing the polarizer 16 is positioned at −125° with respect to the extending direction of the ridge line R. Note that, although FIG. 11 shows an embodiment in which the in-plane slow axis SY on the surface of the first optically anisotropic layer 24 facing the polarizer 16 is positioned at −125° with respect to the extending direction of the ridge line R, the present embodiment is not limited to this embodiment, and the in-plane slow axis SY on the surface of the first optically anisotropic layer 24 facing the polarizer 16 is preferably positioned within a range of −140 to −110°, and more preferably within a range of −130 to −120°, with respect to the extending direction of the ridge line R. In addition, in FIG. 11, the twist direction of the liquid crystal compound is counterclockwise.

[0075] In other words, it is preferable that the organic EL display device 10 satisfy the following requirement A7. Requirement A7: The in-plane slow axis of the first optically anisotropic layer on the surface facing the organic EL display panel is located in the range of -55 to -25°, the in-plane slow axis of the first optically anisotropic layer on the surface facing the polarizer is located in the range of -140 to -110°, and the twist direction of the liquid crystal compound is counterclockwise.

[0076] Furthermore, when requirement A7 is satisfied, when the organic EL display device 10 is observed from the polarizer 16 side, the absorption axis of the polarizer 16 is preferably located within a range of −55 to −35°, and more preferably within a range of −50 to −40°, when expressed as a positive angle value in the clockwise direction and a negative angle value in the counterclockwise direction, based on the extension direction of the ridge line R formed when the organic EL display device is bent. In other words, it is preferable that the organic EL display device 10 satisfy the following requirement B7. Requirement B7: Requirement A7 is satisfied, and the absorption axis of the polarizer is located within the range of −55 to −35°.

[0077] [Requirement A8] FIG. 12 is a diagram for explaining an example of an embodiment that satisfies requirement A8, and shows the relationship between the ridgeline R (dashed line) formed when the organic EL display device 10 is bent at the bending portion, the in-plane slow axis SX (solid line) on the surface of the first optically anisotropic layer 24 facing the organic EL display panel 14, and the in-plane slow axis SY (solid line) on the surface of the first optically anisotropic layer 24 facing the polarizer 16, when the organic EL display device 10 is observed from the white arrow in FIG. FIG. 12 also shows a ridgeline R that is formed when the organic EL display device 10 is bent at a bend. When observing the organic EL display device 10 from the white arrow in Figure 4, the position (rotation angle) of the in-plane slow axis is expressed as a positive angle value in the clockwise direction and a negative angle value in the counterclockwise direction, with the extension direction of the ridge line R as the reference (0°). Furthermore, when observing the organic EL display device 10 from the white arrow in Figure 4, the twist direction of the liquid crystal compound is determined to be clockwise or counterclockwise based on the in-plane slow axis on the surface of the first optically anisotropic layer 24 facing the organic EL display panel.

[0078] In one example of an embodiment that satisfies requirement A8, the angle θX8 formed between the in-plane slow axis SX on the surface of the first optically anisotropic layer 24 facing the organic EL display panel 14 and the extending direction of the ridge line R is 50°, as shown in Fig. 12. More specifically, the in-plane slow axis SX on the surface of the first optically anisotropic layer 24 facing the organic EL display panel 14 is positioned at 50° with respect to the extending direction of the ridge line R. Note that Fig. 12 shows an embodiment in which the in-plane slow axis SX on the surface of the first optically anisotropic layer 24 facing the organic EL display panel 14 is positioned at 50° with respect to the extending direction of the ridge line R, but the present embodiment is not limited to this embodiment. The in-plane slow axis SX on the surface of the first optically anisotropic layer 24 facing the organic EL display panel 14 is preferably positioned within a range of 35 to 65°, and more preferably within a range of 45 to 55°, with respect to the extending direction of the ridge line R. The angle θY8 between the in-plane slow axis SY on the surface of the first optically anisotropic layer 24 facing the polarizer 16 and the extending direction of the ridge line R is 35°. More specifically, the in-plane slow axis SY on the surface of the first optically anisotropic layer 24 facing the polarizer 16 is positioned at −35° with respect to the extending direction of the ridge line R. Note that, although FIG. 12 shows an embodiment in which the in-plane slow axis SY on the surface of the first optically anisotropic layer 24 facing the polarizer 16 is positioned at −35° with respect to the extending direction of the ridge line R, the present embodiment is not limited to this embodiment, and the in-plane slow axis SY on the surface of the first optically anisotropic layer 24 facing the polarizer 16 is preferably positioned within a range of −50 to −20°, and more preferably within a range of −40 to −30°, with respect to the extending direction of the ridge line R. In addition, in FIG. 12, the twist direction of the liquid crystal compound is counterclockwise.

[0079] In other words, it is preferable that the organic EL display device 10 satisfy the following requirement A8. Requirement A8: The in-plane slow axis of the first optically anisotropic layer on the surface facing the organic EL display panel is located in the range of 35 to 65°, the in-plane slow axis of the first optically anisotropic layer on the surface facing the polarizer is located in the range of -50 to -20°, and the twist direction of the liquid crystal compound is counterclockwise.

[0080] Furthermore, when requirement A8 is satisfied, when the organic EL display device 10 is observed from the polarizer 16 side, the absorption axis of the polarizer 16 is preferably positioned within a range of 35 to 55°, and more preferably within a range of 40 to 50°, when expressed as a positive angle value in the clockwise direction and a negative angle value in the counterclockwise direction, based on the extension direction of the ridge line R formed when the organic EL display device is bent. In other words, it is preferable that the organic EL display device 10 satisfy the following requirement B8. Requirement B8: Requirement A8 is satisfied, and the absorption axis of the polarizer is located within the range of 35 to 55°.

[0081] (Manufacturing method for organic EL display device) The organic EL display device is not particularly limited, and known methods can be used. For example, a method can be mentioned in which a composition for forming an optically anisotropic layer containing a predetermined polymerizable liquid crystal compound is applied to a predetermined substrate to form a coating film, the coating film is then subjected to an alignment treatment, and then a curing treatment is performed to form predetermined optically anisotropic layers (first to fourth optically anisotropic layers), the formed optically anisotropic layer and a polarizer are laminated via an adhesive layer to produce a circular polarizer, and the produced circular polarizer is then bonded to an organic EL display panel.

[0082] When the above-mentioned composition for forming an optically anisotropic layer is used, the liquid crystal compound having a polymerizable group (hereinafter also referred to as "polymerizable liquid crystal compound") contained in the composition for forming an optically anisotropic layer is as described above, and the optimum polymerizable liquid crystal compound is appropriately selected in accordance with the formation of each optically anisotropic layer (first optically anisotropic layer to fourth optically anisotropic layer). The content of the polymerizable liquid crystal compound in the composition for forming an optically anisotropic layer is preferably from 60 to 99 mass %, more preferably from 70 to 98 mass %, based on the total solid content of the composition for forming an optically anisotropic layer. The solid content means a component capable of forming an optically anisotropic layer from which the solvent has been removed, and is considered to be a solid content even if the component is in a liquid state.

[0083] The composition for forming an optically anisotropic layer may contain compounds other than the liquid crystal compound having a polymerizable group. For example, in order to twist align the liquid crystal compound, the composition for forming the optically anisotropic layer preferably contains a chiral agent. The chiral agent is added to twist align the liquid crystal compound, but of course, if the liquid crystal compound is an optically active compound, such as one having an asymmetric carbon atom in the molecule, the addition of the chiral agent is not necessary. Furthermore, depending on the production method and twist angle, the addition of the chiral agent is not necessary. The chiral agent is not particularly limited in structure as long as it is compatible with the liquid crystal compound used in combination. Any known chiral agent (for example, described in "Liquid Crystal Device Handbook," edited by the 142nd Committee of the Japan Society for the Promotion of Science, Chapter 3, Section 4-3, "Chiral Agents for TN and STN," p. 199, 1989) can be used. The amount of the chiral agent used is not particularly limited, and is adjusted so as to achieve the twist angle described above.

[0084] The composition for forming an optically anisotropic layer may contain a polymerization initiator. The polymerization initiator to be used is selected depending on the type of polymerization reaction, and examples thereof include a thermal polymerization initiator and a photopolymerization initiator. The content of the polymerization initiator in the composition for forming an optically anisotropic layer is preferably from 0.01 to 20% by mass, more preferably from 0.5 to 10% by mass, based on the total solid content of the composition for forming an optically anisotropic layer.

[0085] Other components that may be contained in the composition for forming an optically anisotropic layer include, in addition to those mentioned above, polyfunctional monomers, alignment control agents (vertical alignment agents, horizontal alignment agents), surfactants, adhesion improvers, plasticizers, and solvents. Other components include photo-alignable compounds (e.g., photo-alignable polymers). The photo-alignable compounds are compounds having photo-alignable groups, and the photo-alignable groups can be aligned in a predetermined direction by light irradiation.

[0086] Examples of methods for applying the composition for forming an optically anisotropic layer 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.

[0087] The alignment treatment can be carried out by drying the coating film at room temperature or by heating the coating film. In the case of a thermotropic liquid crystal compound, the liquid crystal phase formed by the alignment treatment can generally be transitioned by a change in temperature or pressure. In the case of a lyotropic liquid crystal compound, the transition can also be achieved by changing the composition ratio, such as the amount of solvent. The conditions for heating the coating are not particularly limited, but the heating temperature is preferably 50 to 250° C., more preferably 50 to 150° C., and the heating time is preferably 10 seconds to 10 minutes. After heating the coating film, the coating film may be cooled, if necessary, before the curing treatment (light irradiation treatment) described below.

[0088] The method of curing the coating film in which the polymerizable liquid crystal compound is oriented is not particularly limited, and examples thereof include light irradiation treatment and heat treatment. Among these, from the viewpoint of manufacturability, light irradiation treatment is preferred, and ultraviolet irradiation treatment is more preferred. The irradiation conditions for the light irradiation treatment are not particularly limited, but are preferably 50 to 1000 mJ / cm 2 The irradiation dose is preferably 1000 ppm or more. The atmosphere during the light irradiation treatment is not particularly limited, but a nitrogen atmosphere is preferred.

[0089] When forming another optically anisotropic layer directly on an optically anisotropic layer, for example, a photo-alignable polymer may be unevenly distributed on the surface of the optically anisotropic layer, and the photo-alignable polymer on the surface of the optically anisotropic layer may be aligned by light irradiation, thereby imparting an alignment control force.

[0090] (Characteristics of organic EL display devices) The organic EL display device 10 is bent at any appropriate portion. For example, the display device may be bent at the center like a foldable display device, or may be bent at the edges from the perspective of design and maximizing the display screen. It goes without saying that it is sufficient for specific portions of the organic EL display device 10 (for example, some or all of the four corners) to be bent diagonally depending on the application. Furthermore, the organic EL display device 10 may be bent at one location or at two or more locations as long as it satisfies any one of the above requirements A1 to A8. [Example]

[0091] The features of the present invention will be explained in more detail below with reference to examples and comparative examples. The materials, amounts used, ratios, treatment details, and treatment procedures shown in the following examples can be changed as appropriate 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 specific examples shown below.

[0092] Example 1 (Preparation of Cellulose Acylate Film (Substrate)) The following components were charged into a mixing tank and stirred, and the resulting composition was further heated at 90°C for 10 minutes. The resulting composition was then filtered through filter paper with an average pore size of 34 μm and a sintered metal filter with an average pore size of 10 μm to prepare a dope. The solid concentration of the dope was 23.5 mass%, the amount of plasticizer added was the ratio relative to the cellulose acylate, and the solvent for the dope was methylene chloride / methanol / butanol = 81 / 18 / 1 (mass ratio).

[0093] ---------------------------------------------------------------------------------- Cellulose acylate dope ---------------------------------------------------------------------------------- Cellulose acylate (acetyl substitution degree 2.86, viscosity average polymerization degree 310) 100 parts by mass Sugar ester compound 1 (represented by chemical formula (S4)) 6.0 parts by mass Sugar ester compound 2 (represented by chemical formula (S5)) 2.0 parts by mass Silica particle dispersion (AEROSIL R972, manufactured by Nippon Aerosil Co., Ltd.) 0.1 part by mass Solvent (methylene chloride / methanol / butanol) ----------------------------------------------------------------------------------

[0094] [ka]

[0095] [ka]

[0096] The dope prepared above was cast using a drum film-forming machine. The dope was cast from a die onto a metal support cooled to 0°C, and then the resulting web (film) was peeled off from the drum. The drum was made of SUS.

[0097] The web (film) obtained by casting was peeled from the drum and dried for 20 minutes in a tenter apparatus, which clipped both ends of the web with clips while transporting the film at 30 to 40°C. Subsequently, the web was post-dried by zone heating while being transported by rolls. The obtained web was knurled and then wound up. The resulting cellulose acylate film had a thickness of 40 μm, an in-plane retardation Re(550) of 1 nm at a wavelength of 550 nm, and a retardation Rth(550) in the thickness direction at a wavelength of 550 nm of 26 nm.

[0098] (Alkaline saponification treatment) The cellulose acylate film was passed through a dielectric heating roll at a temperature of 60°C to raise the film surface temperature to 40°C, and then an alkaline solution having the composition shown below was applied to the band surface of the film using a bar coater in an amount of 14 ml / m. 2 The film was then conveyed for 10 seconds under a steam-type far-infrared heater manufactured by Noritake Co., Ltd. that had been heated to 110°C. Subsequently, using the same bar coater, pure water was applied to the film at a rate of 3 ml / m. 2 Next, after washing with water using a fountain coater and removing the water 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.

[0099] ---------------------------------------------------------------------------------- alkaline solution ---------------------------------------------------------------------------------- Potassium hydroxide 4.7 parts by mass Water 15.8 parts by mass Isopropanol 63.7 parts by mass Surfactant: C 14 H 29 O(CH2CH2O) 20 H 1.0 parts by mass Propylene glycol 14.8 parts by mass ----------------------------------------------------------------------------------

[0100] (Formation of alignment film Y1) An alignment film coating solution having the following composition was continuously applied to the alkaline saponified surface of the cellulose acylate film using a wire bar #14. The resulting coating film was dried with hot air at 60°C for 60 seconds and then with hot air at 100°C for 120 seconds to form alignment film Y1.

[0101] ---------------------------------------------------------------------------------- Alignment film coating liquid ---------------------------------------------------------------------------------- 10 parts by mass of the following polyvinyl alcohol Water 371 parts by mass Methanol 119 parts by mass Glutaraldehyde (crosslinking agent) 0.5 parts by mass Citric acid ester (manufactured by Sankyo Chemical Co., Ltd.) 0.175 parts by mass ----------------------------------------------------------------------------------

[0102] (Polyvinyl alcohol)

[0103] [ka]

[0104] (Formation of Optically Anisotropic Layer A) The alignment film Y1 prepared above was subjected to a continuous rubbing treatment. At this time, the longitudinal direction of the long film was parallel to the conveying direction, and the angle between the longitudinal direction of the film (conveying direction) and the rotation axis of the rubbing roller was 76°. The longitudinal direction of the film (conveying direction) was set to 90°, and when observed from the film side, the width direction of the film was set as the reference (0°) and clockwise directions were expressed as positive values, so the rotation axis of the rubbing roller was at -14°. In other words, the position of the rotation axis of the rubbing roller was rotated 76° clockwise from the longitudinal direction of the film as the reference when observed from the film side.

[0105] Onto the above-mentioned rubbed alignment film Y1, composition A for forming an optically anisotropic layer containing a discotic liquid crystal compound of the following composition was applied using a Giesser coater to form a composition layer. Thereafter, the obtained composition layer was heated with hot air at 80°C for 2 minutes to dry the solvent and ripen the alignment of the discotic liquid crystal compound. Subsequently, the obtained composition layer was irradiated with UV light (500 mJ / cm) at 80°C. 2 ) was carried out to fix the alignment of the liquid crystal compound, thereby forming an optically anisotropic layer A. The thickness of the optically anisotropic layer A was 1.4 μm. The in-plane retardation at a wavelength of 550 nm was 168 nm. The average tilt angle of the discotic plane of the discotic liquid crystal compound with respect to the film plane was 90°, confirming that the compound was aligned perpendicular to the film plane. The angle of the in-plane slow axis of the optically anisotropic layer A was parallel to the rotation axis of the rubbing roller, and when the width direction of the film was 0° (the longitudinal direction was 90° counterclockwise and -90° clockwise), the in-plane slow axis was -14° when viewed from the optically anisotropic layer A side. The optically anisotropic layer A corresponds to a negative A plate (second optically anisotropic layer).

[0106] ---------------------------------------------------------------------------------- Optically anisotropic layer-forming composition A ---------------------------------------------------------------------------------- Discotic liquid crystal compound L-1 80 parts by mass Discotic liquid crystal compound L-2 20 parts by mass Vertical alignment agent V-1 1.2 parts by mass Fluorine-containing compound F-1 0.1 part by mass Fluorine-containing compound F-2 0.06 parts by mass Fluorine-containing compound F-3 0.21 parts by mass Ethylene oxide modified trimethylolpropane triacrylate (V#360, manufactured by Osaka Organic Chemical Co., Ltd.) 5 parts by mass Photopolymerization initiator S-1 4.0 parts by mass Antifoaming agent B-1 2.0 parts by mass Methyl ethyl ketone 200 parts by mass ----------------------------------------------------------------------------------

[0107] Discotic liquid crystal compound L-1

[0108] [ka]

[0109] Discotic liquid crystal compound L-2

[0110] [ka]

[0111] Vertical alignment agent V-1

[0112] [ka]

[0113] Fluorine-containing compound F-1 (in the formula, a and b represent the content (% by mass) of each repeating unit relative to all repeating units, a represents 90% by mass and b represents 10% by mass. The weight-average molecular weight was 15,000.)

[0114] [ka]

[0115] Fluorine-containing compound F-2 (the numerical value for each repeating unit represents the content (% by mass) relative to all repeating units. The weight-average molecular weight was 12,500.)

[0116] [ka]

[0117] Fluorine-containing compound F-3 (the numerical value for each repeating unit represents the content (% by mass) relative to all repeating units. The weight-average molecular weight was 12,500.)

[0118] [ka]

[0119] Photopolymerization initiator S-1

[0120] [ka]

[0121] Defoamer B-1

[0122] [ka]

[0123] (Formation of a laminate of optically anisotropic layer C and optically anisotropic layer B) Onto the cellulose acylate film prepared above, composition C for forming an optically anisotropic layer containing a rod-shaped liquid crystal compound having the following composition was applied using a Giesser coater to form a composition layer. Then, both ends of the film were held, and a cooling plate (9°C) was placed on the side of the film on which the composition layer was formed so as to be 5 mm away from the film, and a heater (75°C) was placed on the side opposite the side on which the composition layer was formed so as to be 5 mm away from the film, and the film was dried for 2 minutes. Next, the sample was heated with hot air at 60°C for 1 minute, and then irradiated with a 365 nm UV-LED at a dose of 100 mJ / cm while purging with nitrogen to keep the oxygen concentration in the atmosphere at 100 ppm or less. 2 Thereafter, the film was annealed with hot air at 120° C. for 1 minute to form an optically anisotropic layer C. The obtained optically anisotropic layer C was irradiated with UV light (ultra-high pressure mercury lamp; UL750; manufactured by HOYA) at room temperature through a wire grid polarizer at a rate of 7.9 mJ / cm. 2 By irradiating the surface with light (wavelength: 313 nm), orientation control ability was imparted to the surface. The film thickness of the optically anisotropic layer C thus formed was 0.7 μm. The in-plane retardation Re at a wavelength of 550 nm was 0 nm, and the retardation Rth in the thickness direction at a wavelength of 550 nm was −68 nm. The average tilt angle of the long axis direction of the rod-like liquid crystal compound with respect to the film plane was 90°, and it was confirmed that the compound was aligned perpendicular to the film plane. The optically anisotropic layer C corresponds to a positive C plate (third optically anisotropic layer).

[0124] ---------------------------------------------------------------------------------- Optically anisotropic layer-forming composition C ---------------------------------------------------------------------------------- Rod-shaped liquid crystal compound L-3 100 parts by mass Polymerizable monomer (A-400, manufactured by Shin-Nakamura Chemical Co., Ltd.) 4.2 parts by mass Photopolymerization initiator S-2 (oxime type) 5.1 parts by mass Photoacid generator D-1 3.0 parts by mass Polymer M-1 2.0 parts by mass Vertical alignment agent V-2 1.9 parts by mass Photo-alignable polymer P-1 0.8 parts by mass Diisopropylethylamine 0.2 parts by mass Methyl ethyl ketone 23.5 parts by mass Ethyl propionate 70.4 parts by mass Methyl isobutyl ketone 375.0 parts by mass ----------------------------------------------------------------------------------

[0125] Rod-shaped liquid crystal compound L-3 (hereinafter referred to as a compound mixture)

[0126] [ka]

[0127] Photopolymerization initiator S-2

[0128] [ka]

[0129] Photoacid generator D-1

[0130] [ka]

[0131] Polymer M-1 (The numerical value for each repeating unit represents the content (% by mass) relative to all repeating units. The weight-average molecular weight was 60,000.)

[0132] [ka]

[0133] Vertical alignment agent V-2

[0134] [ka]

[0135] Photoalignable polymer P-1 (The numerical value shown for each repeating unit indicates the content (mass%) of each repeating unit relative to all repeating units. The weight-average molecular weight was 74,000.)

[0136] [ka]

[0137] Next, on the optically anisotropic layer C prepared above, a composition B for forming an optically anisotropic layer containing a rod-shaped liquid crystal compound having the following composition was applied using a Giesser coater, and heated with hot air at 80°C for 60 seconds. Subsequently, the obtained composition layer was irradiated with UV light (500 mJ / cm) at 80°C. 2 ) was carried out to fix the alignment of the liquid crystal compound, thereby forming an optically anisotropic layer B. The optically anisotropic layer B had a thickness of 1.5 μm, a Δnd at a wavelength of 550 nm of 164 nm, and a twist angle of the liquid crystal compound of 81°. When viewed from the optically anisotropic layer B side, the position of the in-plane slow axis of the optically anisotropic layer B (the alignment axis angle of the liquid crystal compound) was 14° on the air side and 95° on the side in contact with the optically anisotropic layer C, assuming that the width direction of the film was 0° (the longitudinal direction was 90°). The position of the in-plane slow axis of the optically anisotropic layer is expressed as negative when rotated clockwise (right-handed) and positive when rotated counterclockwise (left-handed), with the width direction of the substrate being the reference angle of 0°. The twist angle of the liquid crystal compound is expressed by observing the substrate from the surface side of the optically anisotropic layer, with the orientation axis direction of the liquid crystal compound on the surface side (near side) as the reference, and when the orientation axis direction of the liquid crystal compound on the substrate side (rear side) is clockwise (right-handed), it is negative, and when it is counterclockwise (left-handed), it is positive. The optically anisotropic layer B corresponds to the first optically anisotropic layer.

[0138] ---------------------------------------------------------------------------------- Optically anisotropic layer-forming composition B ---------------------------------------------------------------------------------- Rod-shaped liquid crystal compound L-3 70 parts by mass Rod-shaped liquid crystal compound L-4 30 parts by mass Ethylene oxide modified trimethylolpropane triacrylate (V#360, manufactured by Osaka Organic Chemical Co., Ltd.) 4 parts by mass Photopolymerization initiator (Irgacure 819, manufactured by BASF) 3 parts by mass Left-handed twisted chiral agent C-1 0.48 parts by mass Fluorine-containing compound F-4 0.20 parts by mass Diisopropylethylamine 0.70 parts by mass Ethyl propionate 126.5 parts by mass Methyl isobutyl ketone 126.5 parts by mass -----------------------------------------------------------------

[0139] Rod-shaped liquid crystal compound L-4

[0140] [ka]

[0141] Left-twisted chiral agent C-1

[0142] [ka]

[0143] Fluorine-containing compound F-4 (the numerical value for each repeating unit represents the content (% by mass) relative to all repeating units, the content of the repeating unit on the left side was 76% by mass, and the content of the repeating unit on the right side was 24% by mass. The weight-average molecular weight was 27,300.)

[0144] [ka]

[0145] By the above procedure, a laminate CB was prepared in which the optically anisotropic layer C and the optically anisotropic layer B were directly laminated on a long cellulose acylate film. When the surface of the optically anisotropic layer C in contact with the optically anisotropic layer B was examined by the above method, the presence of a photoalignable polymer was confirmed.

[0146] (Formation of Retardation Layer A) The surface side of the optically anisotropic layer A formed on the long cellulose acylate film prepared above was coated as a UV-curable adhesive with the (active energy ray-curable adhesive composition relating to adhesive layer (2b)) described in paragraph 0184 of JP 2015-011094 A. Next, the optically anisotropic layer A on which the coating film was disposed and the surface side of the optically anisotropic layer B of the laminate CB formed on the long cellulose acylate film prepared above were continuously bonded together so that the angle between the in-plane slow axis of the optically anisotropic layer A and the in-plane slow axis at the surface of the optically anisotropic layer B was 0°. Thereafter, 800 mJ / cm was applied at 50° C. from the side of the bonded optically anisotropic layer C. 2 After irradiating one side with UV (ultraviolet rays), the film was dried with hot air at 70°C for 3 minutes to form an adhesive layer (thickness: 2 µm). Subsequently, the cellulose acylate film and the alignment film Y1 on the optically anisotropic layer A side were peeled off to expose the surface of the optically anisotropic layer A that had been in contact with the cellulose acylate film. In this way, a retardation layer A was obtained in which the optically anisotropic layer C, the optically anisotropic layer B, and the optically anisotropic layer A were laminated in this order on the long cellulose acylate film. The thickness of the retardation layer A was 5.6 μm.

[0147] (Preparation of Linear Polarizer 1) The surface of a support of cellulose triacetate film TJ25 (manufactured by Fujifilm Corporation: thickness 25 μm) was subjected to alkaline saponification treatment. Specifically, the support was immersed in a 1.5 N sodium hydroxide aqueous solution at 55° C. for 2 minutes, then washed in a water washing bath at room temperature, and further neutralized with 0.1 N sulfuric acid at 30° C. After neutralization, the support was washed in a water washing bath at room temperature and further dried with hot air at 100° C. to obtain a polarizer protective film. A 60 μm thick rolled polyvinyl alcohol (PVA) film was continuously stretched in the longitudinal direction in an iodine solution and dried to obtain a polarizer with a thickness of 8 μm. The luminosity-corrected single transmittance of the polarizer was 43%. At this time, the absorption axis direction of the polarizer coincided with the longitudinal direction. The above polarizer protective film was attached to one surface of the above polarizer using the following PVA adhesive to prepare a linear polarizing plate 1.

[0148] (Preparation of PVA adhesive) A PVA adhesive was prepared by dissolving 100 parts by mass of a polyvinyl alcohol resin having acetoacetyl groups (average polymerization degree: 1200, degree of saponification: 98.5 mol%, degree of acetoacetylation: 5 mol%) and 20 parts by mass of methylol melamine in pure water at a temperature of 30°C to obtain an aqueous solution with a solids concentration of 3.7% by mass.

[0149] (Preparation of circular polarizing plate X1) The active energy ray-curable adhesive composition relating to the adhesive layer (2b) described in paragraph 0184 of JP2015-011094A was applied as a UV-curable adhesive to the surface of the polarizer (the surface opposite to the polarizer protective film) of the long linear polarizing plate 1 prepared above, to form a coating film. Next, the linear polarizing plate 1 on which the coating film was arranged and the surface side of the optically anisotropic layer A of the long retardation layer A prepared above were continuously bonded together. Thereafter, 800 mJ / cm2 was applied at 50°C from the side of the bonded optically anisotropic layer C. 2After irradiating one side with UV (ultraviolet rays), the film was dried with hot air at 70°C for 3 minutes to form an adhesive layer (thickness: 2 µm). Subsequently, the cellulose acylate film on the optically anisotropic layer C side was peeled off to expose the surface of the optically anisotropic layer C that had been in contact with the cellulose acylate film. In this manner, a circular polarizing plate X1 composed of a retardation layer A and a polarizer was prepared. The polarizer protective film, polarizer, optically anisotropic layer A, optically anisotropic layer B, and optically anisotropic layer C were laminated in this order, and the angle formed between the absorption axis of the polarizer and the slow axis of the optically anisotropic layer A was 76°. The in-plane slow axis of the surface of the optically anisotropic layer B facing the optically anisotropic layer A was 14°, with the width direction taken as the reference angle of 0°, which coincided with the slow axis direction of the optically anisotropic layer A. The thickness of the circular polarizing plate X1 was 41 μm. The position of the in-plane slow axis on the surface of the optically anisotropic layer B on the side of the optically anisotropic layer A is expressed as negative when rotated clockwise (right-handed) and positive when rotated counterclockwise (left-handed), with the width direction being taken as the reference angle of 0°, when the optically anisotropic layer B is observed from the polarizer side.

[0150] (Production of organic EL display replacement (corresponding to evaluation sample)) An organic EL display panel substitute was fabricated as follows. A PET (polyethylene terephthalate) film was attached to the polyimide with an adhesive, and then the PET film and aluminum were attached adjacent to each other with the adhesive interposed between them to create an OLED display panel substitute with an aluminum / PET film / polyimide structure. The thickness of the resulting OLED display panel substitute was 173 μm. Thereafter, the circular polarizing plate X1 prepared above was attached to the aluminum side of the organic EL display panel replacement, with the polarizer protective film in the circular polarizing plate facing the viewing side and the optically anisotropic layer C facing the organic EL display panel replacement, and the adhesive layer (thickness: 100 μm, complex modulus: 1.37×10 5 The resulting laminate was then bonded together via a thin film (Pa) to produce an organic EL display device substitute. In the organic EL display device substitute produced above, the absorption axis of the polarizer was at 0°, the in-plane slow axis of the optically anisotropic layer B on the surface facing the optically anisotropic layer A was at 76°, and the in-plane slow axis of the optically anisotropic layer B on the surface facing the optically anisotropic layer C was at -5° relative to the extension direction of the ridge line formed when the organic EL display device substitute was folded (hereinafter simply referred to as the "ridge line direction of the organic EL display device substitute"). The positions of the absorption axis of the polarizer and the in-plane slow axis of the liquid crystal compound were expressed as positive when rotated clockwise (right-handed) and negative when rotated counterclockwise (left-handed), with the ridge line direction being taken as the reference angle of 0°, when the organic EL display device substitute was observed from the surface side of the polarizer protective film.

[0151] <Examples 2 to 4, Comparative Example 1> The positions of the absorption axis of the polarizer, the in-plane slow axis of the optically anisotropic layer B on the surface facing the optically anisotropic layer A, and the in-plane slow axis of the optically anisotropic layer B on the surface facing the optically anisotropic layer C were changed to the values ​​shown in Table 1, and the angle formed by the in-plane slow axis of the optically anisotropic layer A and the in-plane slow axis of the optically anisotropic layer B on the surface facing the optically anisotropic layer A was changed to the same angle as in Example 1. An organic EL display device substitute was produced in the same manner as in Example 1, and various evaluations were carried out.

[0152] <Example 5> (Formation of Optically Anisotropic Layer B) The alignment film Y1 prepared above was subjected to a continuous rubbing treatment. At this time, the longitudinal direction of the long film was parallel to the conveying direction, and the angle between the longitudinal direction of the film (conveying direction) and the rotation axis of the rubbing roller was 5°. The longitudinal direction of the film (conveying direction) was set to 90°, and when observed from the film side, the width direction of the film was set as the reference (0°) and clockwise directions were expressed as positive values, so the rotation axis of the rubbing roller was at 5°. In other words, the position of the rotation axis of the rubbing roller was a position rotated 95° clockwise from the longitudinal direction of the film as the reference when observed from the film side.

[0153] Next, the composition B for forming an optically anisotropic layer containing the rod-shaped liquid crystal compound having the above composition was applied onto the rubbed alignment film Y1 using a Giesser coater, and heated with hot air at 80°C for 60 seconds. Subsequently, the obtained composition layer was irradiated with UV light (500 mJ / cm) at 80°C. 2 ) was carried out to fix the alignment of the liquid crystal compound, thereby forming an optically anisotropic layer B. The optically anisotropic layer B had a thickness of 1.5 μm, a Δnd at a wavelength of 550 nm of 164 nm, and a twist angle of the liquid crystal compound of 81°. When viewed from the air interface side, assuming that the width direction of the film is 0° (the longitudinal direction is 90°), the position of the in-plane slow axis (the alignment axis angle of the liquid crystal compound) of the optically anisotropic layer B was 14° on the air side and 95° on the side in contact with the alignment film. The position of the in-plane slow axis of the optically anisotropic layer is expressed as negative when rotated clockwise (right-handed) and positive when rotated counterclockwise (left-handed), with the width direction of the substrate being the reference angle of 0°. The twist angle of the liquid crystal compound is expressed by observing the substrate from the surface side of the optically anisotropic layer, with the orientation axis direction of the liquid crystal compound on the surface side (near side) as the reference, and when the orientation axis direction of the liquid crystal compound on the substrate side (rear side) is clockwise (right-handed), it is negative, and when it is counterclockwise (left-handed), it is positive.

[0154] (Formation of Retardation Layer B) The surface side of the optically anisotropic layer A formed on the long cellulose acylate film prepared above was coated with a UV-curable adhesive (active energy ray-curable adhesive composition relating to adhesive layer (2b)) described in paragraph 0184 of JP-A No. 2015-011094, to form a coating film. Next, the optically anisotropic layer A on which the coating film was disposed and the surface side of the optically anisotropic layer B formed on the long cellulose acylate film prepared above were continuously laminated together. Thereafter, a UV-curable adhesive was applied at 800 mJ / cm at 50°C from the side of the laminated optically anisotropic layer B. 2 After irradiating one side with UV (ultraviolet rays), the film was dried with hot air at 70°C for 3 minutes to form an adhesive layer (thickness: 2 µm). Subsequently, the cellulose acylate film and the alignment film Y1 on the optically anisotropic layer A side were peeled off to expose the surface of the optically anisotropic layer A that had been in contact with the cellulose acylate film. In this way, a retardation layer B was obtained in which the optically anisotropic layer B and the optically anisotropic layer A were laminated in this order on the long cellulose acylate film. The thickness of the retardation layer B was 4.9 μm.

[0155] (Preparation of circular polarizing plate X2) The active energy ray-curable adhesive composition relating to the adhesive layer (2b) described in paragraph 0184 of JP-A No. 2015-011094 was applied as a UV-curable adhesive to the surface of the polarizer (the surface opposite to the polarizer protective film) of the long linear polarizing plate 1 prepared above, to form a coating film. Next, the linear polarizing plate 1 on which the coating film was arranged was continuously bonded to the surface side of the optically anisotropic layer A of the long retardation layer B prepared above. Thereafter, 800 mJ / cm was applied at 50° C. from the side of the bonded optically anisotropic layer B. 2 After irradiating one side with UV (ultraviolet rays), the film was dried with hot air at 70°C for 3 minutes to form an adhesive layer (thickness: 2 µm). Subsequently, the cellulose acylate film and the alignment film Y1 on the optically anisotropic layer B side were peeled off to expose the surface of the optically anisotropic layer B that had been in contact with the cellulose acylate film. In this way, a circular polarizing plate X2 consisting of a retardation layer B and a polarizer was produced. The polarizer protective film, polarizer, optically anisotropic layer A, and optically anisotropic layer B were laminated in this order, and the angle between the absorption axis of the polarizer and the slow axis of the optically anisotropic layer A was 76°. The in-plane slow axis of the surface of the optically anisotropic layer B facing the optically anisotropic layer A was at an angle of 14°, with the width direction taken as the reference angle of 0°, and coincided with the direction of the slow axis of the optically anisotropic layer A. The circular polarizer X2 had a thickness of 40 μm. The position of the in-plane slow axis on the surface of the optically anisotropic layer B on the side of the optically anisotropic layer A is expressed as negative when rotated clockwise (right-handed) and positive when rotated counterclockwise (left-handed), with the width direction being taken as the reference angle of 0°, when the optically anisotropic layer B is observed from the polarizer side.

[0156] (Production of organic EL display replacement (corresponding to evaluation sample)) The circular polarizing plate X2 prepared above was attached to the aluminum side of the organic EL display panel replacement prepared above, with the polarizer protective film in the circular polarizing plate on the viewing side and the optically anisotropic layer B on the organic EL display panel replacement side, so that the adhesive layer (thickness: 100 μm, complex modulus: 1.37×10 5 The substrate was then bonded to the substrate via a protective film (Pa) to produce an organic EL display substitute, and various evaluations were carried out. In the organic EL display device substitute produced above, the absorption axis of the polarizer was at 0°, the in-plane slow axis of the surface of optically anisotropic layer B facing optically anisotropic layer A was at 76°, and the in-plane slow axis of the surface of optically anisotropic layer B facing away from optically anisotropic layer A was at -5° relative to the ridge direction of the organic EL display device substitute. The positions of the absorption axis and in-plane slow axis of the polarizer are expressed as positive when rotating clockwise (right-handed) and negative when rotating counterclockwise (left-handed) with the ridge direction taken as the reference angle of 0°, when observing the substrate from the surface side of the polarizer protective film.

[0157] Example 6 (Formation of a laminate of optically anisotropic layer E and optically anisotropic layer D) Onto the cellulose acylate film prepared above, composition E for forming an optically anisotropic layer containing a rod-shaped liquid crystal compound having the following composition was applied using a Giesser coater to form a composition layer. The film on which the composition layer was formed was heated with hot air at 116°C for 1 minute, and then irradiated with a 365 nm UV-LED at a dose of 150 mJ / cm while purging with nitrogen to make the atmosphere at a temperature of 78°C so that the oxygen concentration was 100 ppm by volume or less. 2 The resulting coating film was then annealed with hot air at 115° C. for 25 seconds to form an optically anisotropic layer E. The obtained optically anisotropic layer E was irradiated with UV light (ultra-high pressure mercury lamp; UL750; manufactured by HOYA) at room temperature through a wire grid polarizer at a rate of 7.9 mJ / cm. 2 By irradiating the surface with light (wavelength: 313 nm), orientation control ability was imparted to the surface. The film thickness of the optically anisotropic layer E was 0.6 μm. The in-plane retardation Re at a wavelength of 550 nm was 0 nm, and the retardation Rth in the thickness direction at a wavelength of 550 nm was 35 nm. The average tilt angle of the discotic plane of the discotic liquid crystal compound with respect to the film plane was 0°, and it was confirmed that the compound was aligned horizontally with respect to the film plane. The optically anisotropic layer E corresponds to a negative C plate (fourth optically anisotropic layer).

[0158] ---------------------------------------------------------------------------------- Optically anisotropic layer-forming composition E ---------------------------------------------------------------------------------- Discotic liquid crystal compound L-1 4 parts by mass Discotic liquid crystal compound L-2 1 part by mass Discotic liquid crystal compound L-5 95.0 parts by mass Ethylene oxide modified trimethylolpropane triacrylate (V#360, manufactured by Osaka Organic Chemical Co., Ltd.) 12.0 parts by mass Photopolymerization initiator S-2 (oxime type) 3.0 parts by mass Photoacid generator D-1 3.0 parts by mass Photo-alignable polymer P-2 0.6 parts by mass Diisopropylethylamine 0.2 parts by mass o-xylene 475 parts by mass ----------------------------------------------------------------------------------

[0159] Discotic liquid crystal compound L-5

[0160] [ka]

[0161] Photoalignable polymer P-2 (The alphabet in each repeating unit indicates the content (mass%) of each repeating unit relative to all repeating units, with a and b being 53 mass% and 47 mass%, respectively. The weight-average molecular weight was 183,000.)

[0162] [ka]

[0163] Next, an optically anisotropic layer-forming composition D containing a discotic liquid crystal compound of the following composition was applied onto the optically anisotropic layer E prepared above using a Giesser coater to form a composition layer. The resulting composition layer was then heated with hot air at 95°C for 2 minutes to dry the solvent and ripen the alignment of the discotic liquid crystal compound. Subsequently, the resulting composition layer was irradiated with UV light (100 mJ / cm2) at 95°C. 2 ) was carried out to fix the alignment of the liquid crystal compound, thereby forming an optically anisotropic layer D. The thickness of the optically anisotropic layer D was 1.3 μm. The in-plane retardation at a wavelength of 550 nm was 160 nm. The average tilt angle of the discotic plane of the discotic liquid crystal compound with respect to the film plane was 90°, confirming that the compound was aligned perpendicular to the film plane. The angle of the in-plane slow axis of the optically anisotropic layer D was -14° when viewed from the optically anisotropic layer D side, assuming that the width direction of the film was 0° (90° counterclockwise and -90° clockwise in the longitudinal direction). The optically anisotropic layer D corresponds to a negative A plate (second optically anisotropic layer).

[0164] ---------------------------------------------------------------------------------- Optically anisotropic layer-forming composition D ---------------------------------------------------------------------------------- Discotic liquid crystal compound L-1 80 parts by mass Discotic liquid crystal compound L-2 20 parts by mass Vertical alignment agent V-1 1.8 parts by mass Fluorine-containing compound F-1 0.1 part by mass Fluorine-containing compound F-2 0.06 parts by mass Fluorine-containing compound F-3 0.21 parts by mass Ethylene oxide modified trimethylolpropane triacrylate (V#360, manufactured by Osaka Organic Chemical Co., Ltd.) 10 parts by mass Photopolymerization initiator S-2 (oxime type) 5.0 parts by mass Antifoaming agent B-1 2.1 parts by mass Methyl ethyl ketone 200 parts by mass ----------------------------------------------------------------------------------

[0165] By the above procedure, a laminate ED was prepared in which the optically anisotropic layer E and the optically anisotropic layer D were directly laminated on a long cellulose acylate film. When the surface of the optically anisotropic layer E in contact with the optically anisotropic layer D was examined by the above method, the presence of a photoalignable polymer was confirmed.

[0166] (Formation of a laminate of optically anisotropic layer C2 and optically anisotropic layer B2) An optically anisotropic layer C2 was prepared in the same manner as in Example 1, except that the thickness of the optically anisotropic layer C was changed from 0.7 μm to 0.9 μm and the retardation Rth in the thickness direction at a wavelength of 550 nm was changed from −68 nm to −89 nm.

[0167] An optically anisotropic layer B2 was prepared on the optically anisotropic layer C2 according to the same procedure as in Example 1, except that the Δnd of the optically anisotropic layer B at a wavelength of 550 nm was changed from 164 nm to 173 nm, and the twist angle of the liquid crystal compound was changed from 81° to 84.5° (when the width direction of the film was 0° (longitudinal direction was 90°), when viewed from the optically anisotropic layer B2 side, the in-plane slow axis was positioned at 10.5° on the surface facing the air and at 95° on the surface in contact with the optically anisotropic layer C2).

[0168] By the above procedure, a laminate C2-B2 was prepared in which an optically anisotropic layer C2 and an optically anisotropic layer B2 were directly laminated on a long cellulose acylate film. When the surface of the optically anisotropic layer C2 that contacted the optically anisotropic layer B2 was examined by the above method, it was confirmed that a photoalignable polymer was present.

[0169] (Formation of Retardation Layer C) The active energy ray-curable adhesive composition (related to adhesive layer (2b)) described in paragraph 0184 of JP-A No. 2015-011094 was applied as a UV-curable adhesive to the surface side of the optically anisotropic layer D of the laminate ED formed on the long cellulose acylate film prepared above, to form a coating film. Next, the laminate ED on which the coating film was arranged was continuously bonded to the surface side of the optically anisotropic layer B2 of the laminate C2-B2 formed on the long cellulose acylate film prepared above. Thereafter, 800 mJ / cm was applied at 50° C. from the side of the bonded optically anisotropic layer C2. 2 After irradiating one side with UV (ultraviolet rays), the film was dried with hot air at 70°C for 3 minutes to form an adhesive layer (thickness: 2 µm). Subsequently, the cellulose acylate film on the optically anisotropic layer E side was peeled off to expose the surface of the optically anisotropic layer E that had been in contact with the cellulose acylate film. In this way, a retardation layer C was obtained in which an optically anisotropic layer C2, an optically anisotropic layer B2, an optically anisotropic layer D, and an optically anisotropic layer E were laminated in this order on a long cellulose acylate film. The thickness of the retardation layer C was 6.3 μm.

[0170] (Preparation of circular polarizer X3) The active energy ray-curable adhesive composition relating to the adhesive layer (2b) described in paragraph 0184 of JP-A No. 2015-011094 was applied as a UV-curable adhesive to the surface of the polarizer (the surface opposite to the polarizer protective film) of the long linear polarizing plate 1 prepared above, to form a coating film. Next, the linear polarizing plate 1 on which the coating film was arranged was continuously bonded to the surface side of the optically anisotropic layer E of the long retardation layer C prepared above. Thereafter, 800 mJ / cm was applied at 50° C. from the side of the bonded optically anisotropic layer C2. 2After irradiating one side with UV (ultraviolet rays), the film was dried with hot air at 70°C for 3 minutes to form an adhesive layer (thickness: 2 µm). Subsequently, the cellulose acylate film on the optically anisotropic layer C2 side was peeled off to expose the surface of the optically anisotropic layer C2 that had been in contact with the cellulose acylate film. In this way, a circular polarizing plate X3 consisting of a retardation layer C and a polarizer was produced. At this time, a polarizer protective film, a polarizer, an optically anisotropic layer E, an optically anisotropic layer D, an optically anisotropic layer B2, and an optically anisotropic layer C2 were laminated in this order, and the angle formed between the absorption axis of the polarizer and the slow axis of the optically anisotropic layer D was 76°. Furthermore, the in-plane slow axis of the surface of the optically anisotropic layer B2 on the side of the optically anisotropic layer D was positioned at 10.5°, with the width direction being the reference angle of 0°. The thickness of the circular polarizing plate X3 was 41 μm. The position of the in-plane slow axis on the surface of the optically anisotropic layer B2 on the optically anisotropic layer D side is expressed as negative when rotated clockwise (right-handed) and positive when rotated counterclockwise (left-handed), with the width direction being the reference angle of 0°, when the optically anisotropic layer B2 is observed from the polarizer side.

[0171] (Production of organic EL display replacement (corresponding to evaluation sample)) The circular polarizing plate X3 prepared above was attached to the aluminum side of the organic EL display panel replacement prepared above, with the polarizer protective film in the circular polarizing plate on the viewing side and the optically anisotropic layer C2 on the organic EL display panel replacement side, and an adhesive layer (thickness: 100 μm, complex modulus: 1.37×10 5 The substrate was then bonded to the substrate via a protective film (Pa) to produce an organic EL display substitute, and various evaluations were carried out. In the organic EL display device substitute produced above, the absorption axis of the polarizer was at 0°, the in-plane slow axis of the optically anisotropic layer B2 on the surface facing the optically anisotropic layer E was at 79.5°, and the in-plane slow axis of the optically anisotropic layer B2 on the surface facing the optically anisotropic layer C was at -5° relative to the ridge direction of the organic EL display device substitute. The positions of the absorption axis and in-plane slow axis of the polarizer are expressed as positive when rotated clockwise (right-handed) and negative when rotated counterclockwise (left-handed), with the ridge direction being taken as the reference angle of 0°, when observing the substrate from the surface side of the polarizer protective film.

[0172] <Comparative Example 2> An organic EL display device substitute was produced in the same manner as in Example 6, except that the direction of the absorption axis of the polarizer relative to the ridge direction of the organic EL display device substitute was changed from 0° to 25°, the in-plane slow axis of the optically anisotropic layer B on the surface facing the optically anisotropic layer A was changed from 79.5° to 104.5°, and the in-plane slow axis of the optically anisotropic layer B on the surface facing the optically anisotropic layer C was changed from -5° to 20°, and various evaluations were carried out.

[0173] <Comparative Example 3> (Formation of alignment film Y2) A long cellulose acylate film (TD80UL, Fujifilm) was passed through a dielectric heating roll at 60°C to raise the film surface temperature to 40°C, and then the above alkaline solution was applied to the band surface of the film using a bar coater in an amount of 14 ml / m. 2 The film was then transported for 10 seconds under a steam-type far-infrared heater manufactured by Noritake Co., Ltd., which had been heated to 110°C. Subsequently, using the same bar coater, pure water was applied to the film at a rate of 3 ml / m 2 Next, after washing with water using a fountain coater and removing the water 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 (thickness: 80 μm).

[0174] The above alignment film coating solution was continuously applied to the alkaline saponified surface of the cellulose acylate film using a wire bar #14. The coating film was then dried with hot air at 60°C for 60 seconds and then with hot air at 100°C for 120 seconds to prepare alignment film Y2.

[0175] (Formation of Optically Anisotropic Layer F) The alignment film Y2 prepared above was subjected to a continuous rubbing treatment. At this time, the longitudinal direction of the long film was parallel to the conveying direction, and the angle between the longitudinal direction of the film and the rotation axis of the rubbing roller was 72.5°. The longitudinal direction of the film (conveying direction) was set to 90°, and when observed from the film side, the width direction of the film was set as the reference (0°) and clockwise directions were expressed as positive values, so the rotation axis of the rubbing roller was at -17.5°. In other words, the position of the rotation axis of the rubbing roller was rotated 72.5° clockwise from the longitudinal direction of the film as the reference when observed from the film side.

[0176] Onto the rubbed alignment film Y2, composition F for forming an optically anisotropic layer containing a discotic liquid crystal compound of the following composition was applied using a Giesser coater to form a composition layer. The resulting composition layer was then heated with hot air at 130°C for 90 seconds, followed by hot air at 100°C for 60 seconds, in order to dry the solvent and ripen the alignment of the discotic liquid crystal compound. The resulting composition layer was then irradiated with UV light (300 mJ / cm) at 80°C. 2 ) was carried out to fix the alignment of the liquid crystal compound, thereby forming an optically anisotropic layer F. The thickness of the optically anisotropic layer F was 2.0 μm. The in-plane retardation at a wavelength of 550 nm was 236 nm. The average tilt angle of the discotic plane of the discotic liquid crystal compound with respect to the film plane was 90°, confirming that it was aligned perpendicular to the film plane. The angle of the in-plane slow axis of the optically anisotropic layer F was parallel to the rotation axis of the rubbing roller, and when the width direction of the film was 0° (the longitudinal direction was 90° counterclockwise and -90° clockwise), the in-plane slow axis was -17.5° when viewed from the optically anisotropic layer F side.

[0177] ---------------------------------------------------------------------------------- Optically anisotropic layer-forming composition F ---------------------------------------------------------------------------------- Discotic liquid crystal compound L-1 80 parts by mass Discotic liquid crystal compound L-2 20 parts by mass Alignment film interface alignment agent-1 2 parts by mass Fluorine-containing compound F-1 0.1 part by mass Fluorine-containing compound F-5 0.2 parts by mass Fluorine-containing compound F-6 0.05 part by mass Ethylene oxide modified trimethylolpropane triacrylate (V#360, manufactured by Osaka Organic Chemical Co., Ltd.) 5 parts by mass Photopolymerization initiator (Irgacure 907, manufactured by BASF) 4 parts by mass Methyl ethyl ketone 200 parts by mass ----------------------------------------------------------------------------------

[0178] Fluorine-containing compound F-5 (the numerical value for each repeating unit represents the content (% by mass) relative to all repeating units. The weight-average molecular weight was 12,800.)

[0179] [ka]

[0180] Fluorine-containing compound F-6 (the numerical value for each repeating unit represents the content (% by mass) relative to all repeating units. The weight-average molecular weight was 12,500.)

[0181] [ka]

[0182] (Formation of Optically Anisotropic Layer G) The alignment film Y2 prepared above was subjected to a continuous rubbing treatment. At this time, the longitudinal direction of the long film was parallel to the conveying direction, and the angle between the longitudinal direction of the film and the rotation axis of the rubbing roller was 77.5°. The longitudinal direction of the film (conveying direction) was set to 90°, and when observed from the film side, the width direction of the film was set as the reference (0°) and clockwise directions were expressed as positive values. The rotation axis of the rubbing roller was at -12.5°. In other words, the position of the rotation axis of the rubbing roller was rotated 77.5° clockwise from the longitudinal direction of the film as the reference, when observed from the film side.

[0183] On the rubbed alignment film Y2, a composition G for forming an optically anisotropic layer containing a rod-shaped liquid crystal compound of the following composition was applied using a Giesser coater to form a composition layer. The resulting composition layer was then heated with hot air at 60°C for 60 seconds to dry the solvent and ripen the alignment of the rod-shaped liquid crystal compound. Subsequently, the resulting composition layer was irradiated with UV light (300 mJ / cm) at 60°C. 2 ) was carried out to fix the alignment of the liquid crystal compound, thereby forming an optically anisotropic layer G. The thickness of the optically anisotropic layer G was 1.1 μm. The in-plane retardation at a wavelength of 550 nm was 116 nm. The average tilt angle of the long axes of the rod-shaped liquid crystal compounds with respect to the film plane was 0°, confirming that they were aligned horizontally with respect to the film plane. The angle of the in-plane slow axis of the optically anisotropic layer G was perpendicular to the rotation axis of the rubbing roller, and when the width direction of the film was 0° (the longitudinal direction was 90° counterclockwise and -90° clockwise), the in-plane slow axis was 77.5° when viewed from the optically anisotropic layer G side.

[0184] ---------------------------------------------------------------------------------- Optically anisotropic layer forming composition G ---------------------------------------------------------------------------------- Rod-shaped liquid crystal compound L-3 100 parts by mass Photopolymerization initiator (Irgacure 907, manufactured by BASF) 6 parts by mass Fluorine-containing compound F-5 0.25 parts by mass Fluorine-containing compound F-6 0.3 parts by mass Ethylene oxide modified trimethylolpropane triacrylate (V#360, manufactured by Osaka Organic Chemical Co., Ltd.) 8 parts by mass Methyl ethyl ketone 337 parts by mass ----------------------------------------------------------------------------------

[0185] (Formation of Retardation Layer D) The surface side of the optically anisotropic layer F formed on the long cellulose acylate film prepared above was coated with a UV-curable adhesive (an active energy ray-curable adhesive composition relating to adhesive layer (2b)) described in paragraph 0184 of JP-A No. 2015-011094, to form a coating film. Next, the optically anisotropic layer F on which the coating film was disposed and the surface side of the optically anisotropic layer G formed on the long cellulose acylate film prepared above were continuously laminated together. Thereafter, a UV-curable adhesive was applied at 800 mJ / cm at 50°C from the side of the laminated optically anisotropic layer G. 2 After irradiating one side with UV (ultraviolet rays), the film was dried with hot air at 70°C for 3 minutes to form an adhesive layer (thickness: 2 µm). Subsequently, the cellulose acylate film and the alignment film Y2 on the optically anisotropic layer F side were peeled off to expose the surface of the optically anisotropic layer F that had been in contact with the cellulose acylate film. In this way, a retardation layer D was obtained in which the optically anisotropic layer G and the optically anisotropic layer F were laminated in this order on the long cellulose acylate film. The thickness of the retardation layer D was 5.1 μm.

[0186] (Preparation of circular polarizer X4) The active energy ray-curable adhesive composition relating to the adhesive layer (2b) described in paragraph 0184 of JP2015-011094A was applied as a UV-curable adhesive to the surface of the polarizer (the surface opposite to the polarizer protective film) of the long linear polarizing plate 1 prepared above, to form a coating film. Next, the linear polarizing plate 1 on which the coating film was arranged was continuously bonded to the surface side of the optically anisotropic layer F of the long retardation layer D prepared above. Thereafter, 800 mJ / cm2 was applied at 50°C from the side of the bonded optically anisotropic layer G.2 After irradiating one side with UV (ultraviolet rays), the film was dried with hot air at 70°C for 3 minutes to form an adhesive layer (thickness: 2 µm). Subsequently, the cellulose acylate film and alignment film Y2 on the optically anisotropic layer G side were peeled off to expose the surface of the optically anisotropic layer G that had been in contact with the cellulose acylate film. In this way, a circular polarizing plate X4 was produced, which consisted of a retardation layer D and a polarizer. The polarizer protective film, polarizer, optically anisotropic layer F, and optically anisotropic layer G were laminated in this order, and the angle between the absorption axis of the polarizer and the in-plane slow axis of the optically anisotropic layer F was 72.5°. The thickness of the circular polarizing plate X4 was 40 μm.

[0187] (Production of organic EL display replacement (corresponding to evaluation sample)) The circular polarizing plate X4 prepared above was attached to the aluminum side of the organic EL display panel replacement prepared above, with the polarizer protective film in the circular polarizing plate on the viewing side and the optically anisotropic layer G on the organic EL display panel replacement side, so that the adhesive layer (thickness: 100 μm, complex modulus: 1.37×10 5 The substrate was then bonded to the substrate via a protective film (Pa) to produce an organic EL display substitute, and various evaluations were carried out. In the organic EL display device substitute manufactured above, the absorption axis of the polarizer was at 0° with respect to the ridge direction of the organic EL display device substitute. The position of the absorption axis of the polarizer is expressed as positive when rotated clockwise (right-handed) and negative when rotated counterclockwise (left-handed), with the ridge direction being the reference angle of 0°, when observing the substrate from the surface side of the polarizer protective film.

[0188] <Comparative Example 4> An organic EL display device substitute was produced according to the same procedure as in Comparative Example 3, except that the direction of the absorption axis of the polarizer relative to the ridge direction of the organic EL display device substitute was changed from 0° to 45°, and various evaluations were carried out.

[0189] <Comparative Example 5> (Formation of Optically Anisotropic Layer H) An optically anisotropic layer H was prepared in the same manner as in Comparative Example 3, except that the thickness of the optically anisotropic layer G was changed from 1.1 μm to 2.0 μm and the in-plane retardation at a wavelength of 550 nm was changed from 116 nm to 236 nm.

[0190] (Formation of Retardation Layer E) A retardation layer E was obtained in which an optically anisotropic layer G and an optically anisotropic layer H were laminated in this order on a long cellulose acylate film in the same manner as in Comparative Example 3, except that the optically anisotropic layer F was changed to the optically anisotropic layer H. The thickness of the retardation layer E was 5.1 μm.

[0191] (Preparation of circular polarizing plate X5) A circularly polarizing plate X5 was produced in the same manner as in Comparative Example 3, except that the retardation layer D was changed to the retardation layer E.

[0192] (Production of organic EL display replacement (corresponding to evaluation sample)) An organic EL display device substitute was produced in the same manner as in Comparative Example 3, except that the circular polarizer X4 was changed to the circular polarizer X5, and various evaluations were carried out.

[0193] <Comparative Example 6> (Formation of Optically Anisotropic Layer I) An optically anisotropic layer I (thickness: 50 μm) was prepared according to the same procedure as in Example 2 described in the Examples section of JP-A No. 2014-170221.

[0194] (Preparation of circular polarizing plate X6) The active energy ray-curable adhesive composition relating to the adhesive layer (2b) described in paragraph 0184 of JP2015-011094A was applied as a UV-curable adhesive to the surface of the polarizer of the long linear polarizing plate 1 prepared above (the surface opposite to the polarizer protective film) to form a coating film. Next, the linear polarizing plate 1 on which the coating film was disposed was continuously bonded to the surface side of the long optical laminate I prepared above. Thereafter, 800 mJ / cm2 was applied at 50°C from the side of the bonded optically anisotropic layer I. 2After irradiating one side with UV (ultraviolet rays), the film was dried with hot air at 70°C for 3 minutes to form an adhesive layer (thickness: 2 µm). In this way, circular polarizing plate X6 was produced. At this time, the polarizer protective film, the polarizer, and the optically anisotropic layer I were laminated in this order, and the angle formed between the absorption axis of the polarizer and the slow axis of the optically anisotropic layer I was 45°. The thickness of circular polarizing plate X6 was 85 μm.

[0195] (Production of organic EL display replacement (corresponding to evaluation sample)) The circular polarizing plate X6 prepared above was attached to the aluminum side of the organic EL display panel replacement prepared above, with the polarizer protective film in the circular polarizing plate on the viewing side and the optically anisotropic layer I on the organic EL display panel replacement side, so that the adhesive layer (thickness: 100 μm, complex modulus: 1.37×10 5 The substrate was then bonded to the substrate via a protective film (Pa) to produce an organic EL display substitute, and various evaluations were carried out. In the organic EL display device substitute manufactured above, the absorption axis of the polarizer was at 0° with respect to the ridge direction of the organic EL display device substitute. The position of the absorption axis of the polarizer is expressed as positive when rotated clockwise (right-handed) and negative when rotated counterclockwise (left-handed), with the ridge direction being the reference angle of 0°, when observing the substrate from the surface side of the polarizer protective film.

[0196] <Various evaluations> (Color evaluation before and after bending) The organic EL display device substitute prepared above was bent with a curvature diameter of 3 mm with the viewing side (circular polarizer side) facing inward, fixed, and held in an environment of 65°C and 90% humidity for 24 hours. The organic EL display device substitute was then removed to room temperature and humidity, and the bent organic EL display device substitute was unbent. The color of the bent portion was visually observed under bright light, and the color difference was evaluated according to the following criteria, compared with the organic EL display device substitute that had not been bent at 65°C and 90% humidity. The results are shown in Table 1. A: There is a visible difference in color before and after bending, but it is very slight. B: A difference in color before and after bending is visible, but is acceptable. C: The difference in color before and after bending is large and unacceptable.

[0197] (45° reflection color evaluation) The visibility of the organic EL display substitutes prepared above was evaluated under bright light. The reflected light was observed when a fluorescent lamp was shone on the display from the front and from a polar angle of 45°, and the visibility at a polar angle of 45° compared to the front was evaluated according to the following criteria. The results are shown in Table 1. A: No visible difference in color from the front or at an angle. B: There is a visible difference in color between the front and oblique directions, but it is very slight. C: A difference in color is visible from the front and at an angle. D: The difference in color between the front and oblique directions is large and unacceptable.

[0198] In Table 1, in the column "Layer structure of retardation layer," Layer 1 corresponds to the layer located on the polarizer side. In Table 1, the column "Polarizer absorption axis relative to ridge direction" indicates the position of the polarizer absorption axis relative to the ridge direction of the organic EL display device replacement. The position of the polarizer absorption axis is expressed as positive when rotated clockwise (right-handed) and negative when rotated counterclockwise (left-handed), with the ridge direction taken as the reference angle of 0°, when observing the substrate from the surface side of the polarizer protective film. In Table 1, the column "Twist layer slow axis relative to ridge direction" indicates the position of the in-plane slow axis on the polarizer-side surface of the first optically anisotropic layer, which is formed by fixing liquid crystal compounds that are twisted along a helical axis extending in the thickness direction, and the position of the in-plane slow axis on the display panel-side surface, relative to the ridge direction of the organic EL display device substitute. The positions of the in-plane slow axes are expressed as positive when the ridge direction is taken as the reference angle of 0°, when the organic EL display device substitute is observed from the viewing side (the surface side of the polarizer protective film), and are expressed as positive when the ridge direction is rotated clockwise (right-handed) and negative when the ridge direction is rotated counterclockwise (left-handed). In Table 1, the column "Twist direction of twist layer" indicates the twist direction of the liquid crystal compound in the first optically anisotropic layer, which is formed by fixing the liquid crystal compound twisted along a helical axis extending in the thickness direction. The twist direction of the liquid crystal compound is expressed as clockwise or counterclockwise based on the in-plane slow axis of the surface of the first optically anisotropic layer facing the organic EL display device substitute when the organic EL display device substitute is observed from the viewing side (the surface side of the polarizer protective film). In Table 1, the "Requirement" column indicates which of the above-mentioned requirements A1 to A8 is met. In Table 1, the "Thickness (μm)" column indicates the thickness of the retardation layer.

[0199] [Table 1]

[0200] As shown in Table 1, it was confirmed that the organic EL display device of the present invention exhibited predetermined effects. In particular, a comparison of Examples 1 to 4 confirmed that the effect was even better when requirements A1 and A2 were met. Furthermore, a comparison between Examples 1 and 5 confirmed that the organic EL display device having the third optically anisotropic layer was more effective. Furthermore, a comparison between Examples 1 and 6 confirmed that the organic EL display device having a fourth optically anisotropic layer was more effective. [Explanation of symbols]

[0201] 10,100 Organic electroluminescent display device 12 Circular polarizer 14 Organic electroluminescent display panel 16 Polarizer 18 Retardation layer 20 Fourth optically anisotropic layer 22 Second optically anisotropic layer 24 First optically anisotropic layer 26 Third optically anisotropic layer 102 Plane part 104 Bend

Claims

1. A bendable organic electroluminescence display device including a circular polarizer and a bendable organic EL display panel, the circularly polarizing plate includes, from the viewing side, a polarizer and a retardation layer, the retardation layer includes a first optically anisotropic layer in which a liquid crystal compound is fixed and twisted along a helical axis extending in a thickness direction, the positions of the in-plane slow axis on the surface of the first optically anisotropic layer facing the organic electroluminescent display panel and the in-plane slow axis on the surface facing the polarizer are expressed as positive angle values ​​in the clockwise direction and negative angle values ​​in the counterclockwise direction with respect to the extending direction of a ridge line formed when the organic electroluminescent display device is bent when the organic electroluminescent display device is observed from the polarizer side; and An organic electroluminescent display device that satisfies any one of requirements A1 to A8 when the twist direction of the liquid crystal compound is expressed as a clockwise or counterclockwise direction based on an in-plane slow axis on the surface of the first optically anisotropic layer facing the organic electroluminescent display panel when the organic electroluminescent display device is observed from the polarizer side. Requirement A1: The in-plane slow axis of the first optically anisotropic layer on the surface facing the organic electroluminescent display panel is located in a range of −20 to 10°, the in-plane slow axis of the first optically anisotropic layer on the surface facing the polarizer is located in a range of 65 to 95°, and the twist direction of the liquid crystal compound is clockwise. Requirement A2: The in-plane slow axis of the first optically anisotropic layer on the surface facing the organic electroluminescent display panel is located in a range of −110 to −80°, the in-plane slow axis of the first optically anisotropic layer on the surface facing the polarizer is located in a range of −25 to 5°, and the twist direction of the liquid crystal compound is clockwise. Requirement A3: The in-plane slow axis of the first optically anisotropic layer on the surface facing the organic electroluminescent display panel is located in the range of -65 to -35°, the in-plane slow axis of the first optically anisotropic layer on the surface facing the polarizer is located in the range of 20 to 50°, and the twist direction of the liquid crystal compound is clockwise. Requirement A4: The in-plane slow axis of the first optically anisotropic layer on the surface facing the organic electroluminescent display panel is located in a range of 25 to 55°, the in-plane slow axis of the first optically anisotropic layer on the surface facing the polarizer is located in a range of 110 to 140°, and the twist direction of the liquid crystal compound is clockwise. Requirement A5: The in-plane slow axis of the first optically anisotropic layer on the surface facing the organic electroluminescent display panel is located in a range of −10 to 20°, the in-plane slow axis of the first optically anisotropic layer on the surface facing the polarizer is located in a range of −95 to −65°, and the twist direction of the liquid crystal compound is counterclockwise. Requirement A6: The in-plane slow axis of the first optically anisotropic layer on the surface facing the organic electroluminescent display panel is located in a range of 80 to 110°, the in-plane slow axis of the first optically anisotropic layer on the surface facing the polarizer is located in a range of −5 to 25°, and the twist direction of the liquid crystal compound is counterclockwise. Requirement A7: The in-plane slow axis of the first optically anisotropic layer on the surface facing the organic electroluminescent display panel is located in the range of −55 to −25°, the in-plane slow axis of the first optically anisotropic layer on the surface facing the polarizer is located in the range of −140 to −110°, and the twist direction of the liquid crystal compound is counterclockwise. Requirement A8: The in-plane slow axis of the first optically anisotropic layer on the surface facing the organic electroluminescent display panel is located in a range of 35 to 65°, the in-plane slow axis of the first optically anisotropic layer on the surface facing the polarizer is located in a range of −50 to −20°, and the twist direction of the liquid crystal compound is counterclockwise.

2. 2. The organic electroluminescent display device according to claim 1, wherein, when the position of the absorption axis of the polarizer is expressed as a positive angle value in the clockwise direction and a negative angle value in the counterclockwise direction relative to the extension direction of the ridge line formed when the organic electroluminescent display device is bent when the organic electroluminescent display device is observed from the polarizer side, the organic electroluminescent display device satisfies any one of the following requirements B1 to B8. Requirement B1: Requirement A1 is satisfied, and the absorption axis of the polarizer is located within the range of −10 to 10°. Requirement B2: Requirement A2 is satisfied, and the absorption axis of the polarizer is located within the range of 80 to 100°. Requirement B3: Requirement A3 is satisfied, and the absorption axis of the polarizer is located within the range of −55 to −35°. Requirement B4: Requirement A4 is satisfied, and the absorption axis of the polarizer is located within a range of 35 to 55°. Requirement B5: Requirement A5 is satisfied, and the absorption axis of the polarizer is located within the range of −10 to 10°. Requirement B6: Requirement A6 is satisfied, and the absorption axis of the polarizer is located within the range of 80 to 100°. Requirement B7: Requirement A7 is satisfied, and the absorption axis of the polarizer is located within the range of −55 to −35°. Requirement B8: Requirement A8 is satisfied, and the absorption axis of the polarizer is located within the range of 35 to 55°.

3. 3. The organic electroluminescent display device according to claim 1, wherein the retardation layer comprises a second optically anisotropic layer that is a negative A plate.

4. 4. The organic electroluminescent display device according to claim 1, wherein the retardation layer includes a third optically anisotropic layer that is a positive C plate.

5. 5. The organic electroluminescent display device according to claim 1, wherein the retardation layer includes a fourth optically anisotropic layer that is a negative C plate.

6. 6. The organic electroluminescent display device according to claim 1, wherein the retardation layer has a thickness of 20 μm or less.

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