WO2023176365A1 - Unité de lentille, stratifié, corps d'affichage, procédé de fabrication de corps d'affichage et procédé d'affichage - Google Patents

Unité de lentille, stratifié, corps d'affichage, procédé de fabrication de corps d'affichage et procédé d'affichage Download PDF

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Publication number
WO2023176365A1
WO2023176365A1 PCT/JP2023/006735 JP2023006735W WO2023176365A1 WO 2023176365 A1 WO2023176365 A1 WO 2023176365A1 JP 2023006735 W JP2023006735 W JP 2023006735W WO 2023176365 A1 WO2023176365 A1 WO 2023176365A1
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Prior art keywords
polarizing member
reflective polarizing
display
reflective
lens
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PCT/JP2023/006735
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English (en)
Japanese (ja)
Inventor
丈治 喜多川
周作 後藤
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日東電工株式会社
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Priority claimed from JP2022077676A external-priority patent/JP2023166851A/ja
Application filed by 日東電工株式会社 filed Critical 日東電工株式会社
Publication of WO2023176365A1 publication Critical patent/WO2023176365A1/fr

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/02—Viewing or reading apparatus
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements

Definitions

  • the present invention relates to a lens part, a laminate, a display body, a method for manufacturing a display body, and a display method.
  • Image display devices represented by liquid crystal display devices and electroluminescence (EL) display devices are rapidly becoming popular.
  • EL electroluminescence
  • optical members such as polarizing members and retardation members are generally used to realize image display and improve image display performance (see, for example, Patent Document 1).
  • the main object of the present invention is to provide a lens portion that can realize weight reduction and high definition of VR goggles, and can further suppress afterimages.
  • Lens units according to embodiments of the present invention are used in display systems that display images to users.
  • the lens portion includes a reflective polarizing member that reflects light that is emitted forward from the display surface of the display element that represents an image and has passed through the polarizing member and the first ⁇ /4 member; an absorptive polarizing member disposed in front of; a first lens section disposed on the optical path between the display element and the reflective polarizing member; and between the display element and the first lens section; a half mirror arranged to transmit the light emitted from the display element and reflect the light reflected by the reflective polarizing member toward the reflective polarizing member; the half mirror and the reflective polarizing member; and a second ⁇ /4 member disposed on the optical path between the two.
  • the second ⁇ /4 member and the reflective polarizing member are integrated. 2.
  • the reflection axis of the reflective polarizing member and the absorption axis of the absorptive polarizing member may be arranged parallel to each other. 3.
  • the first lens section and the half mirror may be integrated. 4.
  • the lens section may include a second lens section disposed in front of the absorption type polarizing member. 5.
  • the angle between the absorption axis of the polarizing member included in the display element and the slow axis of the first ⁇ /4 member is 40° to 50°.
  • the angle between the absorption axis of the polarizing member included in the display element and the slow axis of the second ⁇ /4 member may be 40° to 50°. 6.
  • the second ⁇ /4 member, the reflective polarizing member, and the absorbing polarizing member may be integrated.
  • the laminate according to the embodiment of the present invention is used in the lens portion described in any one of 1 to 6 above, and includes the second ⁇ /4 member and the reflective polarizing member.
  • the laminate described in item 7 above may further include the absorption type polarizing member.
  • the reflection axis of the reflective polarizing member and the absorption axis of the absorptive polarizing member may be arranged parallel to each other.
  • a display body according to an embodiment of the present invention has the lens portion described in any one of 1 to 6 above.
  • a method for manufacturing a display body according to an embodiment of the present invention is a method for manufacturing a display body having a lens portion according to any one of items 1 to 6 above.
  • a display method includes the steps of: causing light representing an image emitted through a polarizing member and a first ⁇ /4 member to pass through a half mirror and a first lens portion; a step of causing the light that has passed through the first lens portion to pass through a second ⁇ /4 member; reflecting the light that has passed through the second ⁇ /4 member toward the half mirror by the reflective polarizing member; step; allowing the light reflected by the reflective polarizing member and the half mirror to be transmitted through the reflective polarizing member by the second ⁇ /4 member; and the light transmitted through the reflective polarizing member. and transmitting the second ⁇ /4 member through the absorption type polarizing member, and the second ⁇ /4 member and the reflective polarizing member are integrated.
  • the lens portion according to the embodiment of the present invention it is possible to realize weight reduction and high definition of VR goggles, and furthermore, it is possible to suppress afterimages.
  • FIG. 1 is a schematic diagram showing a general configuration of a display system according to one embodiment of the present invention.
  • FIG. 2 is a schematic perspective view showing an example of a multilayer structure included in a reflective polarizing film.
  • Refractive index (nx, ny, nz) "nx" is the refractive index in the direction in which the in-plane refractive index is maximum (i.e., slow axis direction), and "ny” is the direction perpendicular to the slow axis in the plane (i.e., fast axis direction) "nz” is the refractive index in the thickness direction.
  • Refractive index (nx, ny, nz) "nx" is the refractive index in the direction in which the in-plane refractive index is maximum (i.e., slow axis direction), and "ny” is the direction perpendicular to the slow axis in the plane (i.e., fast axis direction) "nz” is the refractive index in the thickness direction.
  • In-plane phase difference (Re) "Re( ⁇ )” is an in-plane retardation measured with light having a wavelength of ⁇ nm at 23°C.
  • Re(550) is an in-plane retardation measured with light having a wavelength of 550 nm at 23°C.
  • Phase difference in thickness direction (Rth) is a retardation in the thickness direction measured with light having a wavelength of ⁇ nm at 23°C.
  • Rth (550) is the retardation in the thickness direction measured with light having a wavelength of 550 nm at 23°C.
  • FIG. 1 is a schematic diagram showing the general configuration of a display system according to one embodiment of the present invention.
  • FIG. 1 schematically shows the arrangement, shape, etc. of each component of the display system 2.
  • the display system 2 includes a display element 12 , a reflective polarizing member 32 , an absorbing polarizing member 34 , a first lens section 16 , a half mirror 18 , a first retardation member 20 , and a second retardation member 22 and a second lens section 24.
  • the reflective polarizing member 32 is disposed at the front of the display element 12 on the display surface 12a side, and can reflect the light emitted from the display element 12.
  • the first lens section 16 is arranged on the optical path between the display element 12 and the reflective polarizing member 32, and the half mirror 18 is arranged between the display element 12 and the first lens section 16.
  • the first retardation member 20 is arranged on the optical path between the display element 12 and the half mirror 18, and the second retardation member 22 is arranged on the optical path between the half mirror 18 and the reflective polarizing member 32.
  • Absorptive polarizing member 34 may be placed in front of reflective polarizing member 32.
  • the reflection axis of the reflective polarizing member and the absorption axis of the absorptive polarizing member may be arranged substantially parallel to each other, and the transmission axis of the reflective polarizing member and the transmission axis of the absorptive polarizing member may be arranged substantially parallel to each other.
  • the reflective polarizing member 32 and the absorbing polarizing member 34 may be collectively referred to as a reflecting section.
  • the second retardation member 22 (hereinafter, the second retardation member may be referred to as a second ⁇ /4 member) and the reflective polarizing member 32 are integrated.
  • the second ⁇ /4 member 22, the reflective polarizing member 32, and the absorbing polarizing member 34 are integrated.
  • the second ⁇ /4 member, the reflective polarizing member, and, if necessary, the absorbing polarizing member are integrated (typically, laminated) via, for example, an adhesive layer (not shown).
  • the second ⁇ /4 member, the reflective polarizing member, and if necessary, the absorbing polarizing member are fixed, and the optical axis (slow axis, reflective axis, and absorption axis) of each member is fixed. It is possible to prevent an increase in transmittance due to misalignment of the axis arrangement.
  • the fixation of the second ⁇ /4 member and the reflective polarizing member can be the main cause of such an effect.
  • the adhesive layer may be formed of an adhesive or a pressure-sensitive adhesive.
  • the thickness of the adhesive layer is, for example, 0.05 ⁇ m to 30 ⁇ m, preferably 3 ⁇ m to 20 ⁇ m, and more preferably 5 ⁇ m to 15 ⁇ m.
  • lens section 4 Components arranged in front of the half mirror (in the illustrated example, the half mirror 18, the first lens part 16, the second retardation member 22, the reflective polarizing member 32, the absorption polarizing member 34, and the second lens part 24) may be collectively referred to as a lens section (lens section 4).
  • the display element 12 is, for example, a liquid crystal display or an organic EL display, and has a display surface 12a for displaying images.
  • the light emitted from the display surface 12a passes through a polarizing member (typically, a polarizing film) that may be included in the display element 12, and is emitted as first linearly polarized light.
  • a polarizing member typically, a polarizing film
  • the first retardation member 20 is a ⁇ /4 member that can convert the first linearly polarized light incident on the first retardation member 20 into first circularly polarized light (hereinafter, the first retardation member is referred to as the first (sometimes referred to as a ⁇ /4 member). Note that the first retardation member 20 may be provided integrally with the display element 12.
  • the half mirror 18 transmits the light emitted from the display element 12 and reflects the 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 section 16.
  • the second retardation member 22 is a ⁇ /4 member that can transmit the light reflected by the reflective polarizing member 32 and the half mirror 18 through the reflective polarizing member 32. Note that the second retardation member 22 may be provided integrally with the first lens portion 16.
  • the first circularly polarized light emitted from the first ⁇ /4 member 20 passes through the half mirror 18 and the first lens section 16, and is converted into second linearly polarized light by the second ⁇ /4 member 22. .
  • the second linearly polarized light emitted from the second ⁇ /4 member 22 is reflected toward the half mirror 18 without passing through the reflective polarizing member 32.
  • the polarization direction of the second linearly polarized light incident on the reflective polarizing member 32 is the same direction 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.
  • the second linearly polarized light reflected by the reflective polarizing member 32 is converted into second circularly polarized light by the second ⁇ /4 member 22, and the second circularly polarized light is emitted from the second ⁇ /4 member 22. passes through the first lens section 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 section 16 and is converted into third linearly polarized light by the second ⁇ /4 member 22.
  • the third linearly polarized light is transmitted through the reflective polarizing member 32.
  • the polarization direction of the third linearly polarized light incident on the reflective polarizing member 32 is 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.
  • the light that has passed through the reflective polarizing member 32 passes through the absorbing polarizing member 34 and the second lens section 24, and enters the user's eyes 26.
  • the polarization direction of the third linearly polarized light transmitted through the reflective polarizing member 32 is the same direction as the transmission axis of the absorbing polarizing member.
  • 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 may be arranged substantially perpendicular to each other.
  • the angle between the absorption axis of the polarizing member included in the display element 12 and the slow axis of the first retardation member 20 is, for example, 40° to 50°, may be 42° to 48°, and is about 45°. It may be °.
  • the angle between the absorption axis of the polarizing member included in the display element 12 and the slow axis of the second retardation member 22 is, for example, 40° to 50°, may be 42° to 48°, and is about 45°. It may be °.
  • the slow axis of the first phase difference member 20 and the slow axis of the second phase difference member 22 may be arranged substantially parallel to each other.
  • the in-plane retardation Re (550) of the first retardation member 20 is, for example, 100 nm to 190 nm, may be 110 nm to 180 nm, may be 130 nm to 160 nm, or may be 135 nm to 155 nm. .
  • the first retardation member 20 preferably exhibits inverse dispersion wavelength characteristics in which the retardation value increases depending on the wavelength of the measurement light.
  • Re(450)/Re(550) of the first retardation member 20 is, for example, less than 1 and may be 0.95 or less, further less than 0.90, and even 0.85 or less. good.
  • Re(450)/Re(550) of the first retardation member 20 is, for example, 0.75 or more.
  • the first retardation member 20 has Re(400)/Re(550) ⁇ 0.85, Re(650)/Re(550)>1.03, and Re(750)/Re( 550)>1.05.
  • the first retardation member 20 has 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 at least two. More preferably, all of them are satisfied.
  • the first retardation member 20 preferably exhibits a refractive index characteristic of nx>ny ⁇ nz.
  • the Nz coefficient of the first retardation member 20 is preferably 0.9 to 3, more preferably 0.9 to 2.5, even more preferably 0.9 to 1.5, particularly preferably 0.9 to 1. It is 3.
  • the first retardation member 20 is formed of any suitable material that can satisfy the above characteristics.
  • the first retardation member 20 may be, for example, a stretched resin film or an oriented solidified layer of a liquid crystal compound.
  • the resins contained in the above resin film include polycarbonate resin, polyester carbonate resin, polyester resin, polyvinyl acetal resin, polyarylate resin, cyclic olefin resin, cellulose resin, polyvinyl alcohol resin, and polyamide resin. , polyimide resin, polyether resin, polystyrene resin, acrylic resin, and the like. These resins may be used alone or in combination (for example, blended or copolymerized).
  • a resin film containing a polycarbonate resin or a polyester carbonate resin hereinafter sometimes simply referred to as a polycarbonate resin
  • polycarbonate resins contain structural units derived from fluorene-based dihydroxy compounds, structural units derived from isosorbide-based dihydroxy compounds, alicyclic diols, alicyclic dimethanols, di-, tri-, or polyethylene glycols, and alkylene-based dihydroxy compounds. a structural unit derived from at least one dihydroxy compound selected from the group consisting of glycol or spiroglycol.
  • the polycarbonate resin contains a structural unit derived from a fluorene dihydroxy compound, a structural unit derived from an isosorbide dihydroxy compound, a structural unit derived from an alicyclic dimethanol, and/or a di, tri, or polyethylene glycol. More preferably, it contains a structural unit derived from a fluorene dihydroxy compound, a structural unit derived from an isosorbide dihydroxy compound, and a structural unit derived from di, tri or polyethylene glycol. .
  • the polycarbonate resin may contain structural units derived from other dihydroxy compounds as necessary.
  • the thickness of the first retardation member 20 made of a stretched resin film is, for example, 10 ⁇ m to 100 ⁇ m, preferably 10 ⁇ m to 70 ⁇ m, more preferably 10 ⁇ m to 40 ⁇ m, and still more preferably 20 ⁇ m to 30 ⁇ m.
  • the liquid crystal compound alignment and solidification layer is a layer in which the liquid crystal compound is aligned in a predetermined direction within the layer, and the alignment state is fixed.
  • the "alignment hardened layer” is a concept that includes an orientation hardened layer obtained by curing a liquid crystal monomer as described below.
  • rod-shaped liquid crystal compounds are typically aligned in the slow axis direction of the first retardation member (homogeneous alignment). Examples of rod-shaped liquid crystal compounds include liquid crystal polymers and liquid crystal monomers.
  • the liquid crystal compound is preferably polymerizable. If the liquid crystal compound is polymerizable, the alignment state of the liquid crystal compound can be fixed by aligning the liquid crystal compound and then polymerizing it.
  • the liquid crystal compound alignment and solidification layer is produced by subjecting the surface of a predetermined base material to an alignment treatment, applying a coating liquid containing the liquid crystal compound to the surface, and subjecting the liquid crystal compound to the alignment treatment. It can be formed by orienting it in a corresponding direction and fixing the orientation state. Any suitable orientation treatment may be employed as the orientation treatment. Specifically, mechanical alignment treatment, physical alignment treatment, and chemical alignment treatment can be mentioned. Specific examples of mechanical alignment treatment include rubbing treatment and stretching treatment. Specific examples of physical alignment treatment include magnetic field alignment treatment and electric field alignment treatment. Specific examples of chemical alignment treatment include oblique vapor deposition and photo alignment treatment. As the treatment conditions for various orientation treatments, any appropriate conditions may be adopted depending on the purpose.
  • the alignment of the liquid crystal compound is carried out by treatment at a temperature that exhibits a liquid crystal phase depending on the type of liquid crystal compound.
  • the liquid crystal compound assumes a liquid crystal state, and the liquid crystal compound is oriented in accordance with the orientation treatment direction of the substrate surface.
  • the alignment state is fixed by cooling the liquid crystal compound aligned as described above.
  • the alignment state is fixed by subjecting the liquid crystal compound aligned as described above to polymerization treatment or crosslinking treatment.
  • liquid crystal compound any suitable liquid crystal polymer and/or liquid crystal monomer can be used as the liquid crystal compound.
  • the liquid crystal polymer and the liquid crystal monomer may be used alone or in combination.
  • Specific examples of liquid crystal compounds and methods for producing liquid crystal alignment solidified layers are described in, for example, JP 2006-163343A, JP 2006-178389A, and WO 2018/123551A. The descriptions of these publications are incorporated herein by reference.
  • the thickness of the first retardation member 20 composed of the liquid crystal alignment solidified layer is, for example, 1 ⁇ m to 10 ⁇ m, preferably 1 ⁇ m to 8 ⁇ m, more preferably 1 ⁇ m to 6 ⁇ m, and still more preferably 1 ⁇ m to 4 ⁇ m.
  • the in-plane retardation Re (550) of the second retardation member 22 is, for example, 100 nm to 190 nm, may be 110 nm to 180 nm, may be 130 nm to 160 nm, or may be 135 nm to 155 nm. .
  • the second retardation member 22 preferably exhibits inverse dispersion wavelength characteristics in which the retardation value increases depending on the wavelength of the measurement light.
  • Re(450)/Re(550) of the second retardation member 22 is, for example, less than 1 and may be 0.95 or less, further less than 0.90, and even 0.85 or less. good.
  • Re(450)/Re(550) of the second retardation member 22 is, for example, 0.75 or more.
  • the second retardation member 22 has Re(400)/Re(550) ⁇ 0.85, Re(650)/Re(550)>1.03, and Re(750)/Re( 550)>1.05.
  • the second retardation member 22 has 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 at least two. More preferably, all of them are satisfied.
  • the second retardation member 22 preferably exhibits a refractive index characteristic of nx>ny ⁇ nz.
  • the Nz coefficient of the second retardation member 22 is preferably 0.9 to 3, more preferably 0.9 to 2.5, even more preferably 0.9 to 1.5, particularly preferably 0.9 to 1. It is 3.
  • the second retardation member 22 is formed of any suitable material that can satisfy the above characteristics.
  • the second retardation member 22 may be, for example, a stretched resin film or an oriented solidified layer of a liquid crystal compound.
  • the same explanation as for the first retardation member 20 can be applied to the second retardation member 22 made of a stretched resin film or an oriented solidified layer of a liquid crystal compound.
  • the first retardation member 20 and the second retardation member 22 may have the same configuration (forming material, thickness, optical properties, etc.), or may have different configurations.
  • the reflective polarizing member can transmit polarized light parallel to its transmission axis (typically, linearly polarized light) while maintaining its polarized state, and can reflect light in other polarized states.
  • the reflective polarizing member is typically composed of a film having a multilayer structure (sometimes referred to as a reflective polarizing film).
  • the thickness of the reflective polarizing member is, for example, 10 ⁇ m to 150 ⁇ m, preferably 20 ⁇ m to 100 ⁇ m, and more preferably 30 ⁇ m to 60 ⁇ m.
  • FIG. 2 is a schematic perspective view showing an example of a multilayer structure included in a reflective polarizing film.
  • the multilayer structure 32a has layers A having birefringence and layers B having substantially no birefringence alternating.
  • the total number of layers making up the multilayer structure may be between 50 and 1000.
  • the refractive index nx in the x-axis direction of the A layer is larger 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 the B layer are substantially the same,
  • 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.
  • the x-axis direction can become the reflection axis
  • the y-axis direction can become 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.
  • the above layer A is typically made of a material that exhibits birefringence when stretched.
  • materials include, for example, naphthalene dicarboxylic acid polyesters (eg, polyethylene naphthalate), polycarbonates, and acrylic resins (eg, polymethyl methacrylate).
  • the B layer is typically made of a material that does not substantially exhibit birefringence even when stretched. Examples of such materials include copolyesters of naphthalene dicarboxylic acid and terephthalic acid.
  • the multilayer structure may be formed by a combination of coextrusion and stretching. For example, after extruding the material constituting layer A and the material constituting layer B, they are multilayered (for example, using a multiplier). The obtained multilayer laminate is then stretched.
  • the x-axis direction in the illustrated example may correspond to the stretching direction.
  • reflective polarizing films include, for example, 3M's product names "DBEF” and “APF” and Nitto Denko's product name "APCF”.
  • the cross transmittance (Tc) of the reflective polarizing member (reflective polarizing film) may be, for example, 0.01% to 3%.
  • the single 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) can be, for example, 92% to 99.99%.
  • the absorption type polarizing member is typically composed of a resin film containing a dichroic substance (sometimes referred to as an absorption type polarizing film).
  • the thickness of the absorption type polarizing member is, for example, 1 ⁇ m or more and 20 ⁇ m or less, 2 ⁇ m or more and 15 ⁇ m or less, 12 ⁇ m or less, 10 ⁇ m or less, and 8 ⁇ m or less. The thickness may be 5 ⁇ m or less.
  • the above-mentioned absorption type polarizing film may be produced from a single layer resin film, or may be produced using a laminate of two or more layers.
  • 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 is coated with iodine or dichloromethane.
  • An absorption type polarizing film can be obtained by dyeing with a dichroic substance such as a color dye, stretching, and the like. Among these, an absorption type polarizing film obtained by dyeing a PVA film with iodine and uniaxially stretching it is preferred.
  • the above-mentioned staining with iodine is performed, for example, by immersing the PVA-based film in an iodine aqueous solution.
  • the stretching ratio of the above-mentioned uniaxial stretching is preferably 3 to 7 times. Stretching may be performed after the dyeing process or may be performed while dyeing. Alternatively, it may be dyed after being stretched. If necessary, the PVA film is subjected to swelling treatment, crosslinking treatment, washing treatment, drying treatment, etc.
  • the laminate produced using the above-mentioned laminate of two or more layers is a laminate of a resin base material and a PVA resin layer (PVA resin film) laminated on the resin base material, or a laminate of a resin base material and a PVA resin layer (PVA resin film) laminated on the resin base material, or Examples include a laminate of a material and a PVA-based resin layer formed by coating on the resin base material.
  • An absorptive polarizing film obtained using a laminate of a resin base material and a PVA resin layer coated on the resin base material can be obtained by, for example, applying a PVA resin solution to the resin base material and drying it.
  • a PVA resin layer on a base material to obtain a laminate of the resin base material and the PVA resin layer; stretching and dyeing the laminate to make the PVA resin layer an absorption type polarizing film.
  • a polyvinyl alcohol resin layer containing a halide and a polyvinyl alcohol resin is formed on one side of the resin base material.
  • Stretching typically includes immersing the laminate in an aqueous boric acid solution and stretching.
  • the stretching may further include stretching the laminate in air at a high temperature (for example, 95° C. or higher) before stretching in the boric acid aqueous solution, if necessary.
  • the laminate is preferably subjected to a drying shrinkage treatment in which the laminate is heated while being conveyed in the longitudinal direction to shrink by 2% or more in the width direction.
  • the manufacturing method of this embodiment includes subjecting the laminate to an in-air auxiliary stretching process, a dyeing process, an underwater stretching process, and a drying shrinkage process in this order.
  • the obtained resin base material/absorbing polarizing film laminate may be used as is (that is, the resin base material may be used as a protective layer of the absorbing polarizing film), or the resin base material/absorbing polarizing film laminate may be used as is.
  • Any suitable protective layer depending on the purpose may be laminated on the peeled surface from which the resin base material is peeled off, or on the surface opposite to the peeled surface. Details of the manufacturing method of such an absorption type polarizing film are described in, for example, Japanese Patent Application Publication No. 2012-73580 and Japanese Patent No. 6470455. The entire descriptions of these publications are incorporated herein by reference.
  • the orthogonal transmittance (Tc) of the absorption type polarizing member (absorption type polarizing film) is preferably 0.5% or less, more preferably 0.1% or less, and still more preferably 0.05% or less. be.
  • the single transmittance (Ts) of the absorption type polarizing member (absorption type polarizing film) is, for example, 41.0% to 45.0%, preferably 42.0% or more.
  • the degree of polarization (P) of the absorption type polarizing member (absorption type polarizing film) is, for example, 99.0% to 99.997%, preferably 99.9% or more.
  • the orthogonal transmittance (Tc) of the reflective part is preferably 0.5% or less, more preferably 0.1% or less, and still more preferably 0.05% or less. By satisfying such orthogonal transmittance, visibility of afterimages (ghosts) by the user can be suppressed, and excellent display characteristics can be achieved.
  • the single transmittance (Ts) of the reflective portion is preferably 40.0% to 45.0%, more preferably 41.0% or more.
  • the degree of polarization (P) of the reflective portion is preferably 99.0% to 99.997%, more preferably 99.9% or more.
  • the optical properties of the reflective section may correspond to the optical properties of a reflective polarizing member, or may correspond to the optical properties of a laminate of a reflective polarizing member and an absorbing polarizing member.
  • the above optical properties can be extremely well achieved by combining a reflective polarizing member with an absorptive polarizing member.
  • the second retardation member, the reflective polarizing member, and, if necessary, the absorbing polarizing member are integrated.
  • Embodiments of the present invention also include such integrated products (laminates).
  • the laminate can be used, for example, in the display system of FIG. 1 (typically, the lens portion thereof).
  • the thickness is a value measured by the following measuring method.
  • ⁇ Thickness> The thickness of 10 ⁇ m or less was measured using a scanning electron microscope (manufactured by JEOL Ltd., product name “JSM-7100F”). Thickness exceeding 10 ⁇ m was measured using a digital micrometer (manufactured by Anritsu Corporation, product name “KC-351C”).
  • the PVA resin film was stretched in an aqueous solution containing 4% by weight of boric acid and 5% by weight of potassium iodide so that the length of the PVA-based resin film was 6 times the original length. Furthermore, after performing an iodine ion impregnation treatment with a 3% by weight potassium iodide aqueous solution (iodine impregnation bath), it was dried in an oven at 60° C. for 4 minutes to obtain a polarizing film with a thickness of 12 ⁇ m.
  • the HC-TAC film is a film in which a hard coat (HC) layer (7 ⁇ m thick) is formed on a triacetyl cellulose (TAC) film (25 ⁇ m thick), and is pasted with the TAC film facing the polarizer.
  • the oligomerized reaction liquid in the first reactor was transferred to the second reactor.
  • temperature increase and pressure reduction in the second reactor were started, and the internal temperature was 240° C. and the pressure was 0.2 kPa in 50 minutes.
  • polymerization was allowed to proceed until a predetermined stirring power was reached.
  • nitrogen was introduced into the reactor to restore the pressure nitrogen was introduced into the reactor to restore the pressure, the produced polyester carbonate resin was extruded into water, and the strands were cut to obtain pellets.
  • polyester carbonate resin pellets
  • a single-screw extruder manufactured by Toshiba Machine Co., Ltd., cylinder temperature setting: 250°C
  • T-die width 200mm, setting temperature: 250°C
  • a long resin film with a thickness of 130 ⁇ m was produced using a film forming apparatus equipped with a chill roll (temperature setting: 120 to 130° C.), a winder and a winder.
  • 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.
  • a retardation film ( ⁇ /4 member 1) having a thickness of 47 ⁇ m, a Re(590) of 143 nm, and an Nz coefficient of 1.2 was obtained.
  • a coating film was obtained by applying a polyimide solution for an alignment film to a glass substrate with a thickness of 0.7 mm using a spin coating method, drying it at 100°C for 10 minutes, and then baking it at 200°C for 60 minutes. .
  • the obtained coating film was rubbed using a commercially available rubbing device to form an alignment film.
  • the polymerizable composition obtained above was applied to the base material (substantially the alignment film) by a spin coating method, and dried at 100° C. for 2 minutes.
  • the obtained coating film was cooled to room temperature, it was irradiated with ultraviolet rays for 30 seconds at an intensity of 30 mW/cm 2 using a high-pressure mercury lamp. Thereby, a liquid crystal alignment solidified layer ( ⁇ /4 member 2) having a thickness of 1.5 ⁇ m, Re(590) of 143 nm, and Nz coefficient of 1.0 was obtained.
  • Example 1 (Preparation of laminate 1) A polarizing plate 1 is placed on a reflective polarizing film ("APCFG4" manufactured by Nitto Denko Corporation), and an adhesive is placed so that the reflection axis of the reflective polarizing film and the absorption axis of the polarizing film of the polarizing plate 1 are arranged parallel to each other. A laminate of reflective polarizing film/polarizing plate 1 was obtained. Next, the retardation film 1 (second ⁇ /4 member) of Production 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.
  • a polarizing plate 1 is placed on a reflective polarizing film ("APCFG4" manufactured by Nitto Denko Corporation), and an adhesive is placed so that the reflection axis of the reflective polarizing film and the absorption axis of the polarizing film of the polarizing plate 1 are arranged parallel to each other. A laminate of reflective polarizing film/polarizing plate 1 was obtained. Next, the retardation film 1 (second
  • the retardation film 1 was laminated so that its slow axis formed an angle of 45° with respect to the reflection axis of the reflective polarizing film and the absorption axis of the polarizing film of the polarizing plate 1.
  • a laminate 1 having the configuration of ( ⁇ /4) member 1/reflective polarizing film/polarizing plate 1 was obtained.
  • the polarizing plate 1 side of the laminate 1 is bonded to glass (lens substitute) on which an antireflection layer is formed via an adhesive, and ( ⁇ /4) member 1/reflective polarizing film/polarizing plate 1/glass/
  • An evaluation sample E1 having the structure of an antireflection layer was obtained.
  • Example 2 The ⁇ /4 member 1 side of the laminate 1 obtained in Example 1 was bonded to the same glass as in Example 1 via an adhesive to form an antireflection layer/glass/( ⁇ /4) member 1/reflective type. Evaluation sample E2 having the configuration of polarizing film/polarizing plate 1 was obtained.
  • Example 1 In the same manner as in Example 1, a laminate of reflective polarizing film/polarizing plate 1 was obtained. The polarizing plate 1 side of the obtained laminate was bonded to the same glass as in Example 1 via an adhesive to obtain an evaluation sample C1- having the configuration of reflective polarizing film/polarizing plate 1/glass/antireflection layer. I got 1. On the other hand, a second ⁇ /4 member 1 similar to that in Example 1 was bonded to the same glass as in Example 1 via an adhesive to obtain the structure of ( ⁇ /4) member 1/glass/antireflection layer. An evaluation sample C1-2 was obtained.
  • the evaluation samples obtained in Examples and Comparative Examples were evaluated as follows. The evaluation results are shown in Table 1.
  • An ultraviolet-visible spectrophotometer manufactured by Otsuka Electronics Co., Ltd., "LPF-200" was used as an evaluation device.
  • a laminate including the polarizing plate 1 of Production Example 1 and the retardation film 1 (first ⁇ /4 member) of Production Example 2 in order from the light source side was placed on the emission side of the light source of the spectrophotometer.
  • the angle between the absorption axis of the polarizing film of the polarizing plate 1 and the slow axis of the first ⁇ /4 member 1 was 45°. Evaluation samples of Examples and Comparative Examples were placed on the output side of the laminate as follows.
  • evaluation sample E1 of Example 1 A glass similar to the evaluation sample E1 is placed on the light source side, and the evaluation sample E1 is separated from the light source side glass by 1 mm to 3 mm with the second ⁇ /4 member 1 facing the light source side glass. It was placed as follows.
  • the angles of the optical axes of the evaluation sample E1 and the light source side laminate were as follows. Note that “0°” corresponds to the longitudinal direction of the evaluation sample E1, and the angle is counterclockwise with respect to the longitudinal direction.
  • Absorption axis of absorption type polarizing film of light source side laminate 0° Slow axis of first ⁇ /4 member of light source side laminate: 135° Slow axis of second ⁇ /4 member in evaluation sample E1: 45° Reflection axis of reflective polarizing film in evaluation sample E1: 90° Absorption axis of absorption type polarizing film in evaluation sample E1: 90° (Evaluation sample E2 of Example 2)
  • the evaluation sample E2 was placed with the glass facing the light source side, and a glass similar to the evaluation sample E2 was placed on the polarizing plate 1 side of the evaluation sample E2 at a distance of 1 mm to 3 mm from the polarizing plate 1.
  • the angle of the optical axis of each optical member was the same as in Example 1 above.
  • (Evaluation samples C1-1 and C1-2 of Comparative Example 1) Arrange the evaluation sample C1-2 so that the glass is on the light source side, place the evaluation sample C1-1 on the ⁇ /4 member 1 side of the evaluation sample C1-2, and place the reflective polarizing film on the second ⁇ /4 member 1, and was placed at a distance of 1 mm to 3 mm from evaluation sample C1-2.
  • the angle of the optical axis of each optical member was the same as in Example 1 above.
  • this state is referred to as the reference state
  • the single transmittance of the evaluation sample was measured using an ultraviolet-visible spectrophotometer (manufactured by Otsuka Electronics Co., Ltd., "LPF200").
  • the single transmittance is a Y value measured using a 2-degree field of view (C light source) according to JIS Z8701 and subjected to visibility correction.
  • the single transmittance was measured in the same manner as above with the light source side member rotated counterclockwise by 3 degrees and 10 degrees from the reference state. The results are shown in Table 1.
  • the present invention is not limited to the above embodiments, and various modifications are possible.
  • it can be replaced with a configuration that is substantially the same as the configuration shown in the above embodiment, a configuration that has the same effect, or a configuration that can achieve the same purpose.
  • the lens section according to the embodiment of the present invention can be used, for example, in a display body such as VR goggles.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Polarising Elements (AREA)

Abstract

La présente invention concerne une unité de lentille qui permet de réduire le poids et d'augmenter la définition de lunettes VR et peut également supprimer des images rémanentes. L'unité de lentille selon un mode de réalisation de la présente invention est utilisée dans un système d'affichage qui affiche des images à un utilisateur. L'unité de lentille est pourvue : d'un élément de polarisation réfléchissant qui réfléchit la lumière qui a été émise vers l'avant à partir d'une surface d'affichage d'un élément d'affichage représentant une image et passée à travers un élément de polarisation et un premier élément quart d'onde ; d'un élément polarisant d'absorption qui est disposé devant l'élément polarisant réfléchissant ; d'une première unité de lentille qui est disposée sur un trajet optique entre l'élément d'affichage et l'élément polarisant réfléchissant ; d'un demi-miroir qui est disposé entre l'élément d'affichage et la première unité de lentille, permet à la lumière émise par l'élément d'affichage de passer à travers celui-ci, et réfléchit la lumière, réfléchie par l'élément polarisant réfléchissant, vers l'élément polarisant réfléchissant ; et d'un second élément quart d'onde disposé sur un trajet optique entre le demi-miroir et l'élément polarisant réfléchissant. Le second élément quart d'onde et l'élément polarisant réfléchissant sont intégrés.
PCT/JP2023/006735 2022-03-14 2023-02-24 Unité de lentille, stratifié, corps d'affichage, procédé de fabrication de corps d'affichage et procédé d'affichage WO2023176365A1 (fr)

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JP2022-039286 2022-03-14
JP2022039285 2022-03-14
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JP2022039286 2022-03-14
JP2022-077676 2022-05-10
JP2022077676A JP2023166851A (ja) 2022-05-10 2022-05-10 レンズ部、積層体、表示体、表示体の製造方法および表示方法

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002107655A (ja) * 2000-09-27 2002-04-10 Minolta Co Ltd 映像表示装置
JP2019505854A (ja) * 2016-01-28 2019-02-28 深▲セン▼多▲ドゥオ▼新技術有限責任公司Ｓｈｅｎｚｈｅｎ Ｄｌｏｄｌｏ Ｎｅｗ Ｔｅｃｈｎｏｌｏｇｙ Ｃｏ．， Ｌｔｄ． 短距離光拡大モジュール、短距離光拡大方法及び短距離光拡大システム
US20200132994A1 (en) * 2018-07-16 2020-04-30 Shanghai Seeo Optronics Technology Co., Ltd. Virtual reality display device
CN113448101A (zh) * 2021-06-28 2021-09-28 歌尔股份有限公司 光学模组和头戴显示设备

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002107655A (ja) * 2000-09-27 2002-04-10 Minolta Co Ltd 映像表示装置
JP2019505854A (ja) * 2016-01-28 2019-02-28 深▲セン▼多▲ドゥオ▼新技術有限責任公司Ｓｈｅｎｚｈｅｎ Ｄｌｏｄｌｏ Ｎｅｗ Ｔｅｃｈｎｏｌｏｇｙ Ｃｏ．， Ｌｔｄ． 短距離光拡大モジュール、短距離光拡大方法及び短距離光拡大システム
US20200132994A1 (en) * 2018-07-16 2020-04-30 Shanghai Seeo Optronics Technology Co., Ltd. Virtual reality display device
CN113448101A (zh) * 2021-06-28 2021-09-28 歌尔股份有限公司 光学模组和头戴显示设备

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