Lens portion, laminate, display element, method for manufacturing the display element, and display method.

Abstract

To reduce weight of a VR goggle, achieve higher definition, and further provide a lens part capable of suppressing an afterimage.SOLUTION: An optical member set includes a polarization member, a first λ / 4 member, a second λ / 4 member, a reflection type polarization member, and an absorption type polarization member. These optical members are arranged such that light emitted forward from a display element passes through the polarization member and the first λ / 4 member, is reflected on the reflection type polarization member, passes through the second λ / 4 member, then is reflected rearward, and passes through the reflection type polarization member and the absorption type polarization member. The second λ / 4 member is integrated with a first lens part arranged on an optical path between the display element and the reflection type polarization member. The reflection type polarization member and the absorption type polarization member are used in an embodiment of integration with a second lens part arranged in front of the absorption type polarization member. The second λ / 4 member and the reflection type polarization member are arranged isolated from each other. The first lens part and the second λ / 4 member are arranged from the display element side in this order.SELECTED DRAWING: Figure 1

Description

[[Technical Field]]

[0001] The present invention relates to a lens unit, a laminate, a display, a method for manufacturing a display, and a display method. [[Background Art]]

[0002] Image display devices typified by liquid crystal display devices and electroluminescence (EL) display devices (for example, organic EL display devices) are rapidly becoming widespread. In image display devices, optical members such as polarizing members and retardation members are generally used to realize image display and improve the performance of image display (see, for example, Patent Document 1).

[0003] In recent years, new applications of image display devices have been developed. For example, goggles with displays (VR goggles) for realizing Virtual Reality (VR) have begun to be commercialized. Since the use of VR goggles in various scenarios is under consideration, weight reduction and higher definition are desired. Weight reduction can be achieved, for example, by reducing the thickness of lenses used in VR goggles. On the other hand, development of optical members suitable for display systems using thin lenses is also desired. Furthermore, in VR display systems, conversion between circularly polarized light and linearly polarized light, reflection, and the like are used, and there is a problem that light that should originally be reflected transmits through and is visually recognized as an afterimage (ghost). [[Prior Art Documents]] [[Patent Documents]]

[0004] [[Patent Document 1]] Japanese Patent Application Laid-Open No. 2021-103286 [[Summary of the Invention]] [[Problem to be Solved by the Invention]]

[0005] In view of the above, the main object of the present invention is to provide a lens unit that can realize weight reduction and higher definition of VR goggles and can further suppress afterimages. [Means for solving the problem]

[0006] [1] An optical component set according to an embodiment of the present invention includes a polarizing member, a first λ / 4 member, a second λ / 4 member, a reflective polarizing member, and an absorbing polarizing member. Each component included in the optical component set is arranged such that light emitted forward from a display element passes through the polarizing member and the first λ / 4 member, is reflected by the reflective polarizing member, passes through the second λ / 4 member, is reflected forward, and then passes through the reflective polarizing member and the absorbing polarizing member. The second λ / 4 member is integrated with a first lens portion positioned on the optical path between the display element and the reflective polarizing member, and the reflective polarizing member and the absorbing polarizing member are used in a manner in which they are integrated with a second lens portion positioned in front of the absorbing polarizing member. The second λ / 4 member and the reflective polarizing member are spaced apart, and the first lens portion and the second λ / 4 member are arranged in this order from the display element side. [2] In the above [1], the reflection axis of the reflective polarizing member and the absorption axis of the absorptive polarizing member are arranged parallel to each other. [3] In [1] or [2] above, the polarizing member, the first λ / 4 member, and the second λ / 4 member are arranged such that the angle between the absorption axis of the polarizing member and the slow axis of the first λ / 4 member is 40° to 50°, and the angle between the absorption axis of the polarizing member and the slow axis of the second λ / 4 member is 40° to 50°. [4] In any of the above [1] to [3], the second λ / 4 member and the first lens portion are used in a manner in which they are integrated via an adhesive layer, and the reflective polarizing member, the absorbing polarizing member and the second lens portion are used in a manner in which they are integrated via an adhesive layer. [5] According to another aspect of the present invention, a laminate for an optical component set is provided. The laminate is used in any of the optical component sets described in [1] to [4] above. The laminate has the reflective polarizing member and the absorptive polarizing member and is used in a form integrated with the second lens portion. [6] In the above [5], the reflection axis of the reflective polarizing member and the absorption axis of the absorptive polarizing member are arranged parallel to each other. [7]According to yet another aspect of the present invention, a λ / 4 member for an optical member set is provided. The λ / 4 member is a second λ / 4 member used in any of the optical member sets described in [1] to [4] above. The λ / 4 member is used in a form integrated with the first lens portion. [Effects of the Invention]

[0007] According to the lens portion of the embodiment of the present invention, it is possible to achieve lighter weight and higher resolution for VR goggles, and furthermore, to suppress afterimages. [Brief explanation of the drawing]

[0008] [Figure 1] This is a schematic diagram showing the general configuration of a display system according to one embodiment of the present invention. [Figure 2] This is a schematic perspective view showing an example of a multilayer structure contained in a reflective polarizing film. [Modes for carrying out the invention]

[0009] Embodiments of the present invention will be described below with reference to the drawings, but the present invention is not limited to these embodiments. Furthermore, in order to clarify the explanation, the drawings may schematically represent the width, thickness, shape, etc., of each part compared to the embodiments; however, these are merely examples and do not limit the interpretation of the present invention.

[0010] (Definitions of terms and symbols) The definitions of terms and symbols used in this specification are as follows: (1) Refractive index (nx, ny, nz) "nx" is the refractive index in the direction where the refractive index is maximum in the plane (i.e., the slow phase axis direction), "ny" is the refractive index in the direction perpendicular to the slow phase axis in the plane (i.e., the fast phase axis direction), and "nz" is the refractive index in the thickness direction. (2) In-plane phase difference (Re) "Re(λ)" is the in-plane phase difference measured with light of wavelength λnm at 23°C. For example, "Re(550)" is the in-plane phase difference measured with light of wavelength 550nm at 23°C. Re(λ) can be calculated using the formula: Re(λ) = (nx - ny) × d, where d (nm) is the thickness of the layer (film). (3) Phase difference in the thickness direction (Rth) "Rth(λ)" is the phase difference in the thickness direction measured with light of wavelength λnm at 23°C. For example, "Rth(550)" is the phase difference in the thickness direction measured with light of wavelength 550nm at 23°C. Rth(λ) can be calculated using the formula: Rth(λ) = (nx - nz) × d, where d (nm) is the thickness of the layer (film). (4) Nz coefficient The Nz coefficient is calculated using the formula Nz = Rth / Re. (5)Angle In this specification, when an angle is referred to, it encompasses both clockwise and counterclockwise directions with respect to the reference direction. Therefore, for example, "45°" means ±45°.

[0011] Figure 1 is a schematic diagram showing the general configuration of a display system according to one embodiment of the present invention. Figure 1 schematically illustrates the arrangement and shape of each component of the display system 2. The display system 2 comprises a display element 12, a reflective polarizing member 32, an absorbing polarizing member 34, a first lens portion 16, a half mirror 18, a first phase difference member 20, a second phase difference member 22, and a second lens portion 24. The reflective polarizing member 32 is positioned in front of the display element 12 on the display surface 12a side and can reflect light emitted from the display element 12. The first lens portion 16 is positioned in the optical path between the display element 12 and the reflective polarizing member 32, and the half mirror 18 is positioned between the display element 12 and the first lens portion 16. The first phase difference member 20 is positioned in the optical path between the display element 12 and the half mirror 18, and the second phase difference member 22 is positioned in the optical path between the half mirror 18 and the reflective polarizing member 32. The absorbing polarizing member 34 may be positioned in front of the reflective polarizing member 32. The reflection axis of the reflective polarizing member and the absorption axis of the absorbing polarizing member may be positioned approximately parallel to each other, and the transmission axis of the reflective polarizing member and the transmission axis of the absorbing polarizing member may be positioned approximately parallel to each other. Note that the reflective polarizing member 32 and the absorbing polarizing member 34 may be collectively referred to as the reflective section. The second lens section 24 is positioned in front of the absorbing polarizing member 34.

[0012] In embodiments of the present invention, as shown in the illustrated example, the second phase difference member 22 (hereinafter, the second phase difference member may be referred to as the second λ / 4 member) and the first lens portion 16 are integrated, and the reflective polarizing member 32, the absorptive polarizing member 34 and the second lens portion 24 are integrated. The second λ / 4 member 22 and the first lens portion 16, as well as the reflective polarizing member 32, the absorptive polarizing member 34 and the second lens portion 24, are integrated (typically laminated) via, for example, an adhesive layer (not shown). In other words, the second λ / 4 member 22 and the absorptive polarizing member 34 are configured separately. With such a configuration, it is possible to prevent an increase in transmittance due to misalignment of the optical axes (slow axis, reflection axis, and absorption axis) of each member. More details are as follows. The inventors have found that when the second λ / 4 member and the absorbing polarizing member 34 (and consequently the reflective polarizing member 32) are integrated, deformation (typically shrinkage) of the absorbing polarizing film constituting the absorbing polarizing member in a high-temperature environment due to heating, etc., can cause deformation and / or displacement in the slow phase axis direction of the second λ / 4 member. Furthermore, they have found that such deformation and / or displacement in the slow phase axis direction causes light that should be reflected by the reflective polarizing member to pass through the reflective polarizing member without being reflected, and that this transmitted light generates afterimages (ghosting). In contrast, with the above configuration, the transmission of light that should be reflected can be suppressed, and afterimages (ghosting) can be effectively suppressed. If necessary, an appropriate low-reflection film may be further provided (or further integrated) on the surface of the reflective polarizing member 32 on the side where the absorbing polarizing member 34 is not located, and / or on the surface of the second λ / 4 member 22 on the side where the first lens portion 16 is not located. The adhesive layer may be formed with an adhesive or a tack. The thickness of the adhesive layer is, for example, 0.05 μm to 30 μm, preferably 3 μm to 20 μm, and more preferably 5 μm to 15 μm.

[0013] Components arranged in front of the half mirror (in the illustrated example, the half mirror 18, the first lens portion 16, the second retardation member 22, the reflective polarizing member 32, the absorptive polarizing member 34, and the second lens portion 24) may be collectively referred to as a lens portion (lens portion 4).

[0014] The display element 12 is, for example, a liquid crystal display or an organic EL display, and has a display surface 12a for displaying an image. Light emitted from the display surface 12a passes through a polarizing member (typically a polarizing film) that can be included in the display element 12, and is emitted as first linearly polarized light.

[0015] The first retardation member 20 is a λ / 4 member capable of converting first linearly polarized light incident thereon into first circularly polarized light (hereinafter, the first retardation member may sometimes be referred to as the first λ / 4 member). Note that the first retardation member 20 may be provided integrally with the display element 12.

[0016] The half mirror 18 transmits light emitted from the display element 12, and reflects light reflected by the reflective polarizing member 32 toward the reflective polarizing member 32. The half mirror 18 is provided integrally with the first lens portion 16.

[0017] The second retardation member 22 is a λ / 4 member that allows light reflected by the reflective polarizing member 32 and the half mirror 18 to pass through the reflective polarizing member 32. The second retardation member 22 is provided integrally with the first lens portion 16.

[0018] The first circularly polarized light emitted from the first λ / 4 member 20 passes through the half mirror 18 and the first lens portion 16, and is converted into second linearly polarized light by the second λ / 4 member 22. The second linearly polarized light emitted from the second λ / 4 member 22 does not pass through the reflective polarizing member 32 and is reflected toward the half mirror 18. At this time, the polarization direction of the second linearly polarized light incident on the reflective polarizing member 32 is the same as the reflection axis of the reflective polarizing member. Therefore, the second linearly polarized light incident on the reflective polarizing member is reflected by the reflective polarizing member.

[0019] The second linearly polarized light reflected by the reflective polarizing member 32 is converted into a second circularly polarized light by the second λ / 4 member 22, and the second circularly polarized light emitted from the second λ / 4 member 22 passes through the first lens portion 16 and is reflected by the half mirror 18. The second circularly polarized light reflected by the half mirror 18 passes through the first lens portion 16 and is converted into a third linearly polarized light by the second λ / 4 member 22. The third linearly polarized light is transmitted through the reflective polarizing member 32. At this time, the polarization direction of the third linearly polarized light incident on the reflective polarizing member 32 is in the same direction as the transmission axis of the reflective polarizing member. Therefore, the third linearly polarized light incident on the reflective polarizing member 32 is transmitted through the reflective polarizing member.

[0020] Light transmitted through the reflective polarizing member 32 passes through the absorbing polarizing member 34 and the second lens portion 24 before entering the user's eye 26. The polarization direction of the third linearly polarized light transmitted through the reflective polarizing member 32 is in the same direction as the transmission axis of the absorbing polarizing member.

[0021] For example, the absorption axis of the polarizing member included in the display element 12 and the reflection axis of the reflective polarizing member 32 may be arranged substantially parallel to each other, or substantially orthogonal to each other. The angle between the absorption axis of the polarizing member included in the display element 12 and the lagging axis of the first phase difference member 20 may be, for example, 40° to 50°, but may also be 42° to 48°, or approximately 45°. The angle between the absorption axis of the polarizing member included in the display element 12 and the lagging axis of the second phase difference member 22 may be, for example, 40° to 50°, but may also be 42° to 48°, or approximately 45°. The lagging axis of the first phase difference member 20 and the lagging axis of the second phase difference member 22 may be arranged substantially parallel to each other, for example.

[0022] The in-plane phase difference Re(550) of the first phase difference member 20 is, for example, 100 nm to 190 nm, but may also be 110 nm to 180 nm, 130 nm to 160 nm, or 135 nm to 155 nm.

[0023] Preferably, the first retardation member 20 exhibits reverse dispersion wavelength characteristics in which the retardation value increases according to the wavelength of the measurement light. Re(450) / Re(550) of the first retardation member 20 is, for example, less than 1, may be 0.95 or less, may further be less than 0.90, and may further be 0.85 or less. Re(450) / Re(550) of the first retardation member 20 is, for example, 0.75 or more.

[0024] In one embodiment, the first retardation member 20 satisfies all of Re(400) / Re(550) < 0.85, Re(650) / Re(550) > 1.03, and Re(750) / Re(550) > 1.05. It is preferable that the first retardation member 20 satisfies at least one selected from 0.65 < Re(400) / Re(550) < 0.80 (preferably 0.7 < Re(400) / Re(550) < 0.75), 1.0 < Re(650) / Re(550) < 1.25 (preferably 1.05 < Re(650) / Re(550) < 1.20), and 1.05 < Re(750) / Re(550) < 1.40 (preferably 1.08 < Re(750) / Re(550) < 1.36), more preferably satisfies at least two, and still more preferably satisfies all.

[0025] Preferably, the first retardation member 20 exhibits a refractive index profile of nx > ny ≧ nz. Here, "ny = nz" includes not only the case where ny and nz are completely equal, but also the case where they are substantially equal. Therefore, ny < nz may occur within a range that does not impair the effect of the present invention. The Nz coefficient of the first retardation member 20 is preferably 0.9 to 3, more preferably 0.9 to 2.5, still more preferably 0.9 to 1.5, and particularly preferably 0.9 to 1.3.

[0026] The first retardation member 20 is formed of any appropriate material that can satisfy the above characteristics. The first retardation member 20 may be, for example, a stretched film of a resin film or an oriented solidified layer of a liquid crystal compound.

[0027] Examples of resins included in the above-mentioned resin film include polycarbonate resins, polyester carbonate resins, polyester resins, polyvinyl acetal resins, polyarylate resins, cyclic olefin resins, cellulose resins, polyvinyl alcohol resins, polyamide resins, polyimide resins, polyether resins, polystyrene resins, and acrylic resins. These resins may be used individually or in combination (e.g., blended, copolymerized). When the first phase difference member 20 exhibits inverse dispersion wavelength characteristics, a resin film containing a polycarbonate resin or a polyester carbonate resin (hereinafter sometimes simply referred to as a polycarbonate resin) can be suitably used.

[0028] As the polycarbonate resin described above, any suitable polycarbonate resin can be used as long as the effects of the present invention are obtained. For example, the polycarbonate resin includes structural units derived from fluorene-based dihydroxy compounds, structural units derived from isosorbide-based dihydroxy compounds, and structural units derived from at least one dihydroxy compound selected from the group consisting of alicyclic diols, alicyclic dimethanol, di, tri, or polyethylene glycol, and alkylene glycol or spiroglycol. Preferably, the polycarbonate resin includes structural units derived from fluorene-based dihydroxy compounds, structural units derived from isosorbide-based dihydroxy compounds, structural units derived from alicyclic dimethanol, and / or structural units derived from di, tri, or polyethylene glycol; more preferably, it includes structural units derived from fluorene-based dihydroxy compounds, structural units derived from isosorbide-based dihydroxy compounds, and structural units derived from di, tri, or polyethylene glycol. The polycarbonate resin may optionally include structural units derived from other dihydroxy compounds. Further details regarding polycarbonate resins suitably used for the first phase difference member and methods for forming the first phase difference member are described, for example, in Japanese Patent Publication No. 2014-10291, Japanese Patent Publication No. 2014-26266, Japanese Patent Publication No. 2015-212816, Japanese Patent Publication No. 2015-212817, and Japanese Patent Publication No. 2015-212818, and the descriptions in these publications are incorporated herein by reference.

[0029] The thickness of the first phase difference member 20, which is composed of a stretched resin film, is, for example, 10 μm to 100 μm, preferably 10 μm to 70 μm, more preferably 10 μm to 40 μm, and even more preferably 20 μm to 30 μm.

[0030] The orientation-solidified layer of the above-mentioned liquid crystal compound is a layer in which the liquid crystal compound is oriented in a predetermined direction within the layer, and this orientation state is fixed. Note that the term "orientation-solidified layer" is a concept that includes the orientation-cured layer obtained by curing liquid crystal monomers, as described later. In the first phase difference member, typically, rod-shaped liquid crystal compounds are oriented in a state where they are aligned in the slow phase axis direction of the first phase difference member (homogenous orientation). Examples of rod-shaped liquid crystal compounds include liquid crystal polymers and liquid crystal monomers. Preferably, the liquid crystal compound is polymerizable. If the liquid crystal compound is polymerizable, the orientation state of the liquid crystal compound can be fixed by polymerizing it after orientation.

[0031] The above-mentioned oriented solidified layer of liquid crystal compound (liquid crystal oriented solidified layer) can be formed by applying an orientation treatment to the surface of a predetermined substrate, coating the surface with a coating liquid containing the liquid crystal compound to orient the liquid crystal compound in the direction corresponding to the orientation treatment, and fixing the orientation state. Any appropriate orientation treatment can be used as the orientation treatment. Specifically, these include mechanical orientation treatment, physical orientation treatment, and chemical orientation treatment. Specific examples of mechanical orientation treatment include rubbing treatment and stretching treatment. Specific examples of physical orientation treatment include magnetic field orientation treatment and electric field orientation treatment. Specific examples of chemical orientation treatment include oblique deposition and photo-orientation treatment. Any appropriate conditions can be adopted for each orientation treatment depending on the purpose.

[0032] The orientation of liquid crystal compounds is achieved by treating them at a temperature that exhibits the liquid crystal phase, depending on the type of liquid crystal compound. This temperature treatment causes the liquid crystal compound to enter a liquid crystal state, and it then orients according to the orientation treatment direction on the substrate surface.

[0033] In one embodiment, the orientation state is fixed by cooling the liquid crystal compound oriented as described above. If the liquid crystal compound is polymerizable or crosslinkable, the orientation state is fixed by subjecting the liquid crystal compound oriented as described above to a polymerization treatment or a crosslinking treatment.

[0034] As the above-mentioned liquid crystal compound, any suitable liquid crystal polymer and / or liquid crystal monomer can be used. The liquid crystal polymer and liquid crystal monomer may be used individually or in combination. Specific examples of liquid crystal compounds and methods for producing liquid crystal alignment solidified layers are described, for example, in Japanese Patent Publication No. 2006-163343, Japanese Patent Publication No. 2006-178389, and International Publication No. 2018 / 123551. The descriptions in these publications are incorporated herein by reference.

[0035] The thickness of the first phase difference member 20, which is composed of a liquid crystal alignment solidification layer, is, for example, 1 μm to 10 μm, preferably 1 μm to 8 μm, more preferably 1 μm to 6 μm, and even more preferably 1 μm to 4 μm.

[0036] The in-plane phase difference Re(550) of the second phase difference member 22 is, for example, 100 nm to 190 nm, but may also be 110 nm to 180 nm, 130 nm to 160 nm, or 135 nm to 155 nm.

[0037] The second phase difference member 22 preferably exhibits an inverse dispersion wavelength characteristic in which the phase difference value increases with the wavelength of the measured light. The Re(450) / Re(550) of the second phase difference member 22 is, for example, less than 1, may be 0.95 or less, and may be less than 0.90, or even less than 0.85. The Re(450) / Re(550) of the second phase difference member 22 is, for example, 0.75 or more.

[0038] In one embodiment, the second retardation member 22 satisfies all of Re(400) / Re(550)<0.85, Re(650) / Re(550)>1.03, and Re(750) / Re(550)>1.05. The second retardation member 22 preferably satisfies at least one selected from 0.65<Re(400) / Re(550)<0.80 (preferably 0.7<Re(400) / Re(550)<0.75), 1.0<Re(650) / Re(550)<1.25 (preferably 1.05<Re(650) / Re(550)<1.20), and 1.05<Re(750) / Re(550)<1.40 (preferably 1.08<Re(750) / Re(550)<1.36), more preferably satisfies at least two of them, and still more preferably satisfies all of them.

[0039] The second retardation member 22 preferably has refractive index characteristics satisfying the relationship nx>ny≧nz. Here, "ny=nz" includes not only the case where ny and nz are completely equal, but also the case where they are substantially equal. Therefore, ny<nz may occur within a range that does not impair the effects of the present invention. The Nz coefficient of the second retardation member 22 is preferably 0.9 to 3, more preferably 0.9 to 2.5, still more preferably 0.9 to 1.5, and particularly preferably 0.9 to 1.3.

[0040] The second retardation member 22 is formed of any appropriate material that can satisfy the above characteristics. The second retardation member 22 may be, for example, a stretched film of a resin film or an oriented solidified layer of a liquid crystal compound. For the second retardation member 22 constituted by a stretched film of a resin film or an oriented solidified layer of a liquid crystal compound, the same description as for the first retardation member 20 can be applied. The first retardation member 20 and the second retardation member 22 may be members having the same configuration (forming material, thickness, optical characteristics, etc.) or may be members having different configurations.

[0041] The above-described reflective polarizing member transmits polarized light parallel to its transmission axis (typically linearly polarized light) while maintaining its polarization state, and reflects light in other polarization states. Typically, the reflective polarizing member is composed of a multilayer film (sometimes referred to as a reflective polarizing film). In this case, the thickness of the reflective polarizing member is, for example, 10 μm to 150 μm, preferably 20 μm to 100 μm, and more preferably 30 μm to 60 μm.

[0042] Figure 2 is a schematic perspective view showing an example of a multilayer structure included in a reflective polarizing film. The multilayer structure 32a alternates between layers A, which have birefringence, and layers B, which have substantially no birefringence. The total number of layers constituting the multilayer structure may be 50 to 1000. For example, the refractive index nx in the x-axis direction of layer A is greater than the refractive index ny in the y-axis direction, and the refractive index nx in the x-axis direction and the refractive index ny in the y-axis direction of layer B are substantially the same, so the refractive index difference between layer A and layer B is large in the x-axis direction and substantially zero in the y-axis direction. As a result, the x-axis direction can be the reflection axis and the y-axis direction can be the transmission axis. The refractive index difference between layer A and layer B in the x-axis direction is preferably 0.2 to 0.3.

[0043] The above-mentioned layer A is typically composed of a material that exhibits birefringence upon stretching. Examples of such materials include naphthalenedicarboxylic acid polyester (e.g., polyethylene naphthalate), polycarbonate, and acrylic resins (e.g., polymethyl methacrylate). The above-mentioned layer B is typically composed of a material that does not substantially exhibit birefringence upon stretching. Examples of such materials include a copolyester of naphthalenedicarboxylic acid and terephthalic acid. The above multilayer structure can be formed by a combination of co-extrusion and stretching. For example, the materials constituting layer A and layer B are extruded and then multilayered (e.g., using a multiplier). The resulting multilayer laminate is then stretched. The x-axis direction in the illustrated example may correspond to the stretching direction.

[0044] Examples of commercially available reflective polarizing films include the product names "DBEF" and "APF" from 3M, and "APCF" from Nitto Denko.

[0045] The orthogonal transmittance (Tc) of the reflective polarizing member (reflective polarizing film) may be, for example, 0.01% to 3%. The single-element transmittance (Ts) of the reflective polarizing member (reflective polarizing film) may be, for example, 43% to 49%, preferably 45% to 47%. The degree of polarization (P) of the reflective polarizing member (reflective polarizing film) may be, for example, 92% to 99.99%.

[0046] The above-mentioned absorption-type polarizing member is typically composed of a resin film containing a dichroic substance (sometimes referred to as an absorption-type polarizing film). In this case, the thickness of the absorption-type polarizing member is, for example, 1 μm or more and 20 μm or less, but may also be 2 μm or more and 15 μm or less, 12 μm or less, 10 μm or less, 8 μm or less, or 5 μm or less.

[0047] The above-mentioned absorbing polarizing film may be made from a single layer of resin film, or it may be made using a laminate of two or more layers.

[0048] When manufactured from a single layer of resin film, for example, an absorption polarizing film can be obtained by subjecting a hydrophilic polymer film, such as a polyvinyl alcohol (PVA) film, a partially formalized PVA film, or a partially saponified ethylene-vinyl acetate copolymer film, to dyeing treatment with a dichroic substance such as iodine or a dichroic dye, and stretching treatment. Among these, an absorption polarizing film obtained by dyeing a PVA film with iodine and uniaxially stretching it is preferred.

[0049] The above iodine staining is carried out, for example, by immersing the PVA-based film in an iodine aqueous solution. The stretching ratio for the above uniaxial stretching is preferably 3 to 7 times. Stretching may be performed after the staining treatment, or during the staining process. Alternatively, staining may be performed after stretching. If necessary, the PVA-based film may be subjected to swelling, crosslinking, washing, drying, etc.

[0050] When using the above-mentioned laminate of two or more layers, examples of laminates include a laminate of a resin substrate and a PVA-based resin layer (PVA-based resin film) laminated on the resin substrate, or a laminate of a resin substrate and a PVA-based resin layer coated and formed on the resin substrate. An absorption polarizing film obtained using a laminate of a resin substrate and a PVA-based resin layer coated and formed on the resin substrate can be produced, for example, by applying a PVA-based resin solution to a resin substrate, drying it to form a PVA-based resin layer on the resin substrate, and obtaining a laminate of a resin substrate and a PVA-based resin layer; or by stretching and dyeing the laminate to make the PVA-based resin layer an absorption polarizing film. In this embodiment, preferably, a polyvinyl alcohol-based resin layer containing a halogenated compound and a polyvinyl alcohol-based resin is formed on one side of the resin substrate. Stretching typically includes immersing the laminate in an aqueous boric acid solution and stretching it. Furthermore, stretching may, if necessary, further include air-stretching the laminate at a high temperature (e.g., 95°C or higher) before stretching in the aqueous boric acid solution. In addition, in this embodiment, the laminate is preferably subjected to a drying shrinkage treatment in which it shrinks by 2% or more in the width direction by heating while being transported in the longitudinal direction. Typically, the manufacturing method of this embodiment includes applying an air-assisted stretching treatment, a dyeing treatment, a water-assisted stretching treatment, and a drying shrinkage treatment to the laminate in this order. By introducing auxiliary stretching, it is possible to increase the crystallinity of PVA even when PVA is coated on a thermoplastic resin, making it possible to achieve high optical properties. At the same time, by increasing the orientation of PVA in advance, it is possible to prevent problems such as a decrease in the orientation of PVA and dissolution when immersed in water in the subsequent dyeing and stretching processes, making it possible to achieve high optical properties. Furthermore, when the PVA-based resin layer is immersed in a liquid, the disorder of the orientation of polyvinyl alcohol molecules and the decrease in orientation can be suppressed compared to when the PVA-based resin layer does not contain halides. As a result, the optical properties of the absorption polarizing film obtained through processing steps in which the laminate is immersed in a liquid, such as dyeing and water-assisted stretching, can be improved. Furthermore, by shrinking the laminate in the width direction through a drying shrinkage treatment, the optical properties can be improved.The resulting resin substrate / absorbent polarizing film laminate may be used as is (i.e., the resin substrate may be used as a protective layer for the absorbent polarizing film), or an appropriate protective layer may be laminated on the peeled surface obtained by removing the resin substrate from the resin substrate / absorbent polarizing film laminate, or on the surface opposite to the peeled surface, depending on the purpose. Details of such a method for manufacturing an absorbent polarizing film are described, for example, in Japanese Patent Application Publication No. 2012-73580 and Japanese Patent No. 6470455. The entire contents of these publications are incorporated herein by reference.

[0051] The orthogonal transmittance (Tc) of the absorbing polarizing member (absorbing polarizing film) is preferably 0.5% or less, more preferably 0.1% or less, and even more preferably 0.05% or less. The single-element transmittance (Ts) of the absorbing polarizing member (absorbing polarizing film) is, for example, 41.0% to 45.0%, and preferably 42.0% or more. The degree of polarization (P) of the absorbing polarizing member (absorbing polarizing film) is, for example, 99.0% to 99.997%, and preferably 99.9% or more.

[0052] The orthogonal transmittance (Tc) of the reflective portion is preferably 0.5% or less, more preferably 0.1% or less, and even more preferably 0.05% or less. By satisfying such orthogonal transmittance, the user's perception of afterimages (ghosting) can be suppressed, and excellent display characteristics can be achieved. The single-element transmittance (Ts) of the reflective portion is preferably 40.0% to 45.0%, and more preferably 41.0% or more. The polarization degree (P) of the reflective portion is preferably 99.0% to 99.997%, and more preferably 99.9% or more.

[0053] The optical properties of the reflective portion may correspond to those of a reflective polarizing member, or to those of a laminate of a reflective polarizing member and an absorptive polarizing member. These optical properties can be achieved very well by combining an absorptive polarizing member with a reflective polarizing member.

[0054] As described above, the second λ / 4 member and the first lens portion, as well as the reflective polarizing member, the absorbing polarizing member, and the second lens portion, are integrated into a single unit. Embodiments of the present invention also encompass each of these integrated units (laminated bodies). Each laminate can be used, for example, in the display system (typically its lens portion) shown in Figure 1. [Examples]

[0055] The present invention will be specifically described below with reference to examples, but the present invention is not limited to these examples. The thickness is a value measured by the measurement method described below. <thickness> Thicknesses of 10 μm or less were measured using a scanning electron microscope (JEOL Ltd., product name "JSM-7100F"). Thicknesses exceeding 10 μm were measured using a digital micrometer (Anritsu Corporation, product name "KC-351C").

[0056] [Manufacturing Example 1: Fabrication of Polarizing Plate 1] A polyvinyl alcohol film with an average degree of polymerization of 2400, a degree of saponification of 99.9 mol%, and a thickness of 30 μm was immersed in 30°C warm water and uniaxially stretched while swelling until the length of the PVA resin film was 2.0 times its original length. Next, it was immersed in a 0.3 wt% (weight ratio: iodine / potassium iodide = 0.5 / 8) iodine solution at 30°C and stained while uniaxially stretching until the length of the PVA resin film was 3.0 times its original length. Subsequently, the PVA resin film was stretched in an aqueous solution of 4 wt% boric acid and 5 wt% potassium iodide until the length was 6 times its original length. Furthermore, after iodine ion impregnation treatment with an aqueous solution of 3 wt% potassium iodide (iodine impregnation bath), it was dried in a 60°C oven for 4 minutes to obtain a polarizing film with a thickness of 12 μm. A polarizing plate 1 was obtained by laminating a long HC-TAC film and a long acrylic resin film (20 μm thick) which serves as an inner protective layer to both sides of this polarizing film, with their longitudinal directions aligned. The HC-TAC film is a film in which a hard coat (HC) layer (7 μm thick) is formed on a triacetylcellulose (TAC) film (25 μm thick), and it was laminated so that the TAC film was on the polarizer side.

[0057] [Manufacturing Example 2: Fabrication of λ / 4 component 1] A batch polymerization apparatus consisting of two vertical reactors equipped with stirring blades and reflux condensers controlled to 100°C was charged with 29.60 parts by weight (0.046 mol) of bis[9-(2-phenoxycarbonylethyl)fluoren-9-yl]methane, 29.21 parts by weight (0.200 mol) of isosorbide (ISB), 42.28 parts by weight (0.139 mol) of spiroglycol (SPG), 63.77 parts by weight (0.298 mol) of diphenyl carbonate (DPC), and 1.19 × 10⁻² parts by weight (6.78 × 10⁻⁵ mol) of calcium acetate monohydrate as a catalyst. After purging the reactor with reduced pressure nitrogen, the reactor was heated with a heat transfer medium, and stirring was started when the internal temperature reached 100°C. Forty minutes after the start of heating, the internal temperature was raised to 220°C, and while controlling the process to maintain this temperature, the pressure was reduced to 13.3 kPa 90 minutes after reaching 220°C. The phenol vapor produced as a by-product of the polymerization reaction was directed to a 100°C reflux condenser, and the monomer components contained in the phenol vapor were returned to the reactor. The uncondensed phenol vapor was then directed to a 45°C condenser for recovery. Nitrogen was introduced into the first reactor to restore pressure to atmospheric pressure, and then the oligomerized reaction solution in the first reactor was transferred to the second reactor. Next, heating and depressurization in the second reactor were started, and the internal temperature reached 240°C and the pressure 0.2 kPa in 50 minutes. Polymerization was then allowed to proceed until the predetermined stirring power was reached. When the predetermined power was reached, nitrogen was introduced into the reactor to restore pressure, and the resulting polyester carbonate resin was extruded into water. The strands were then cut to obtain pellets. The obtained polyester carbonate resin (pellets) was vacuum-dried at 80°C for 5 hours. Then, a long resin film with a thickness of 130 μm was fabricated using a film-making apparatus equipped with a single-screw extruder (manufactured by Toshiba Machine Co., Ltd., cylinder setting temperature: 250°C), a T-die (width 200 mm, setting temperature: 250°C), a chill roll (setting temperature: 120~130°C), and a winding machine. The obtained long resin film was stretched in the width direction at a stretching temperature of 140°C and a stretching ratio of 2.7 times. This yielded a phase difference film (λ / 4 member 1) with a thickness of 47 μm, a Re(590) of 143 nm, and an Nz coefficient of 1.2.

[0058] [Manufacturing Example 3: Fabrication of λ / 4 component 2] 55 parts by weight of the compound represented by formula (I), 25 parts by weight of the compound represented by formula (II), and 20 parts by weight of the compound represented by formula (III) were added to 400 parts by weight of cyclopentanone (CPN), and then heated to 60°C and stirred to dissolve. After that, the solution of the compounds was allowed to return to room temperature, and 3 parts by weight of Irgacure 907 (BASF Japan), 0.2 parts by weight of Megafac F-554 (DIC), and 0.1 parts by weight of p-methoxyphenol (MEHQ) were added to the solution of the compounds, and the mixture was stirred further. The solution after stirring was clear and homogeneous. The obtained solution was filtered through a 0.20 μm membrane filter to obtain a polymerizable composition. Furthermore, a polyimide solution for the alignment film was applied to a 0.7 mm thick glass substrate using a spin coating method, dried at 100°C for 10 minutes, and then baked at 200°C for 60 minutes to obtain a coating film. The obtained coating film was then rubbed using a commercially available rubbing device to form an alignment film. Next, the polymerizable composition obtained above was applied to the substrate (essentially the orientation film) by spin coating and dried at 100°C for 2 minutes. After the resulting coated film was cooled to room temperature, it was heated using a high-pressure mercury lamp at 30 mW / cm². 2 The material was irradiated with ultraviolet light at this intensity for 30 seconds. This resulted in a liquid crystal alignment solidified layer (λ / 4 member 2) with a thickness of 1.5 μm, a Re(590) of 143 nm, and an Nz coefficient of 1.0. [ka] [ka]

[0059] [Example 1] A polarizing plate 1 was bonded to a reflective polarizing film ("APCFG4" manufactured by Nitto Denko Corporation) via an adhesive, such that the reflection axis of the reflective polarizing film and the absorption axis of the polarizing film of the polarizing plate 1 were parallel to each other, to obtain a laminate of reflective polarizing film / polarizing plate 1. After cutting the laminate to a size of 100 mm vertically and 100 mm horizontally, the polarizing plate 1 side was bonded to glass (lens substitute) via an adhesive to obtain evaluation sample E1-1 having the configuration of reflective polarizing film / polarizing plate 1 / glass. Here, the polarizing plate was cut so that the absorption axis of the polarizing film was in the horizontal direction (0°). On the other hand, after cutting the phase difference film 1 (second λ / 4 member) of manufacturing example 2 to a size of 100 mm vertically and 100 mm horizontally, it was bonded to the same glass as evaluation sample E1-1 via an adhesive to obtain evaluation sample E1-2 having the configuration of (λ / 4) member 1 / glass. Here, the phase difference film was cut so that its slow phase axis rotated 45° counterclockwise when viewed from above with the glass surface facing downwards, with the horizontal direction being 0°.

[0060] [Comparative Example 1] A laminate of reflective polarizing film / polarizing plate 1 was obtained in the same manner as in Example 1. Next, the phase difference film 1 (second λ / 4 member) of Manufacturing Example 2 was bonded to the surface of the reflective polarizing film on the side where the polarizing plate was not provided, via an adhesive. Here, the phase difference film 1 was bonded so that its slow axis was at a 45° angle with respect to the reflection axis of the reflective polarizing film and the absorption axis of the polarizing film of the polarizing plate 1. In this way, a laminate 1 having the configuration of (λ / 4) member 1 / reflective polarizing film / polarizing plate 1 was obtained. After cutting the laminate 1 to a size of 100 mm in length and 100 mm in width, the λ / 4 member 1 side was bonded to glass in the same manner as in Example 1 via an adhesive to obtain an evaluation sample C1 having the configuration of glass / (λ / 4) member 1 / reflective polarizing film / polarizing plate 1. Here, the absorption axis of the polarizing plate is in the horizontal direction (0°), and the slow phase axis of the phase difference film is cut so that, when viewed from above with the glass surface facing downwards and the horizontal direction set to 0°, it rotates 45° counterclockwise.

[0061] [Comparative Example 2] Laminate 1 was obtained in the same manner as in Comparative Example 1. After cutting laminate 1 to a size of 100 mm in length and 100 mm in width, the polarizing plate 1 side was bonded to the same glass as in Example 1 using an adhesive to obtain evaluation sample C2 having the configuration of (λ / 4) member 1 / reflective polarizing film / polarizing plate 1 / glass. Here, the absorption axis of the polarizing plate was in the lateral direction (0°), and the cutting was performed so that the slow phase axis of the phase difference film was 135° counterclockwise when viewed from above with the glass surface facing downwards and the lateral direction at 0°.

[0062] The evaluation samples obtained in the examples and comparative examples were evaluated as follows. The evaluation results are shown in Table 1. <Rating> The dimensional shrinkage rates in the longitudinal and transverse directions were measured when evaluation samples were stored in an 85°C oven for 120 hours. Next, the angles of the slow phase axis and absorption axis were calculated from these dimensional shrinkage rates, and then the axial deviation from 45° was calculated based on these angles. The results are shown in Table 1.

[0063] [Table 1]

[0064] As is clear from Table 1, according to the embodiment of the present invention, the dimensional change rate of the second λ / 4 member is smaller compared to the comparative example, and as a result, the axial misalignment between the second λ / 4 member and the reflective polarizing film is reduced. This means that the increase in transmittance due to the axial misalignment of the second λ / 4 member can be prevented, and thus afterimages (ghosting) can be effectively suppressed. It has also been confirmed that similar results can be obtained by using λ / 4 member 2 from manufacturing example 3 instead of λ / 4 member 1 from manufacturing example 2.

[0065] The present invention is not limited to the embodiments described above, and various modifications are possible. For example, the configurations shown in the embodiments above can be replaced with configurations that are substantially the same, configurations that produce the same effects, or configurations that can achieve the same purpose. [Industrial applicability]

[0066] The lens portion according to the embodiment of the present invention can be used, for example, in a display device such as VR goggles. [Explanation of symbols]

[0067] 2 Display System 4. Lens section 12 Display elements 16 First lens section 18 Half Mirror 20 First phase difference member 22 Second phase difference member 24 Second lens section 32 Reflective polarizing member 34 Absorbing polarizing element

Claims

1. An optical component set comprising a polarizing member, a first λ / 4 member, a half mirror, a second λ / 4 member, a reflective polarizing member, and an absorptive polarizing member, Each component included in the optical component set is used in such a configuration that light emitted forward from the display element passes through the polarizing component, the first λ / 4 component, the half mirror, and the second λ / 4 component, is reflected by the reflective polarizing component, passes through the second λ / 4 component again, is reflected forward by the half mirror, passes through the second λ / 4 component, and then passes through the reflective polarizing component and the absorbing polarizing component. The second λ / 4 member is integrated with a first lens portion positioned in the optical path between the display element and the reflective polarizing member, and the reflective polarizing member and the absorbing polarizing member are integrated with a second lens portion positioned in front of the absorbing polarizing member. The second λ / 4 member and the reflective polarizing member are arranged at a distance from each other, and the first lens portion and the second λ / 4 member are arranged in this order from the display element side. Optical component set.

2. The optical component set according to claim 1, wherein the reflection axis of the reflective polarizing member and the absorption axis of the absorptive polarizing member are arranged parallel to each other.

3. The optical component set according to claim 1, wherein the polarizing member, the first λ / 4 member, and the second λ / 4 member are arranged such that the angle between the absorption axis of the polarizing member and the slow axis of the first λ / 4 member is 40° to 50°, and the angle between the absorption axis of the polarizing member and the slow axis of the second λ / 4 member is 40° to 50°.

4. The optical component set according to claim 1, wherein the second λ / 4 member and the first lens portion are used in a manner in which they are integrated via an adhesive layer, and the reflective polarizing member, the absorbing polarizing member, and the second lens portion are used in a manner in which they are integrated via an adhesive layer.

5. A laminate used in an optical component set according to any one of claims 1 to 4, The system comprises the reflective polarizing member and the absorptive polarizing member, Used in a form integrated with the second lens portion, Laminate for optical component sets.

6. The laminate for an optical member set according to claim 5, wherein the reflection axis of the reflective polarizing member and the absorption axis of the absorptive polarizing member are arranged parallel to each other.

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