WO2018008523A1 - Élément optique et dispositif d'affichage à cristaux liquides - Google Patents

Élément optique et dispositif d'affichage à cristaux liquides Download PDF

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Publication number
WO2018008523A1
WO2018008523A1 PCT/JP2017/023979 JP2017023979W WO2018008523A1 WO 2018008523 A1 WO2018008523 A1 WO 2018008523A1 JP 2017023979 W JP2017023979 W JP 2017023979W WO 2018008523 A1 WO2018008523 A1 WO 2018008523A1
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WIPO (PCT)
Prior art keywords
protective cover
optical member
liquid crystal
film
display device
Prior art date
Application number
PCT/JP2017/023979
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English (en)
Japanese (ja)
Inventor
岳仁 淵田
弘明 麓
勝則 高田
▲吉▼紹 北村
Original Assignee
日東電工株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Priority claimed from JP2017125802A external-priority patent/JP2018013774A/ja
Application filed by 日東電工株式会社 filed Critical 日東電工株式会社
Publication of WO2018008523A1 publication Critical patent/WO2018008523A1/fr

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/13363—Birefringent elements, e.g. for optical compensation

Definitions

  • the present invention relates to an optical member and a liquid crystal display device having the optical member.
  • polarized sunglasses Sunglasses with polarization characteristics
  • the display light of the liquid crystal display device is absorbed by the polarized sunglasses depending on the posture of the viewer, and the visibility decreases.
  • Patent Document 1 a white light-emitting diode is used as a backlight of a liquid crystal display device, and a polymer film having a retardation of 3000 to 30000 nm is provided on the viewer side of the polarizer.
  • a visibility improving method is described in which the angle formed with the slow axis is about 45 °. According to the visibility improvement method of patent document 1, it is supposed that the visibility when a screen is observed through polarized sunglasses can be improved.
  • the display panel is covered with a transparent protective cover such as plastic.
  • a transparent protective cover such as plastic.
  • This invention is made in view of said subject, Comprising:
  • the objective is to provide the optical member which can suppress the fall of visibility when visually recognizing the liquid crystal display device with a protective cover through polarized sunglasses. is there.
  • the optical member of the present invention includes a polarizing film, a high retardation layer, and a protective cover in this order, the in-plane retardation of the high retardation layer is 3000 nm to 30000 nm, the slow axis of the high retardation layer, and the polarization
  • the angle formed with the absorption axis of the film is 40 ° to 50 °
  • the in-plane retardation of the protective cover is 7000 nm or less.
  • the in-plane phase difference of the protective cover is 1000 nm or less.
  • an angle formed between the slow axis of the protective cover and the absorption axis of the polarizing film is ⁇ 5 ° to 5 ° or 85 ° to 95 °.
  • the angle formed by the slow axis of the protective cover and the absorption axis of the polarizing film is 40 ° to 50 °, and the slow axis of the protective cover and the slow axis of the high retardation layer Is an angle of ⁇ 5 ° to 5 ° or 85 ° to 95 °.
  • the thickness of the protective cover is 1000 ⁇ m or more.
  • S ⁇ T The value is 400 or more.
  • an adhesive is filled between the protective cover and the high retardation layer.
  • an antireflection film is laminated on the side of the protective cover opposite to the polarizing film.
  • the liquid crystal display device of the present invention includes the optical member.
  • nx is the refractive index in the direction in which the in-plane refractive index is maximum (that is, the slow axis direction)
  • “ny” is the direction orthogonal to the slow axis in the plane (that is, the fast phase). (Nz direction)
  • “nz” is the refractive index in the thickness direction.
  • FIG. 1 is a cross-sectional view of an optical member according to one embodiment of the present invention.
  • the optical member 10 has a polarizing film 1, a high retardation layer 2, and a protective cover 3 in this order, and the polarizing film 1 and the high retardation layer 2 are attached via an adhesive 4.
  • the in-plane retardation of the high retardation layer 2 is 3000 nm to 30000 nm
  • the in-plane retardation of the protective cover 3 is 7000 nm or less
  • the angle formed between the slow axis of the high retardation layer 2 and the absorption axis of the polarizing film 1 is 40 ° to 50 °.
  • the optical member 10 of the present invention can be mounted on a liquid crystal display device.
  • the optical member 10 By providing the optical member 10 on the viewer side of the liquid crystal cell of the liquid crystal display device, the visibility when the display screen of the liquid crystal display device is observed through polarized sunglasses can be improved. Specifically, a decrease in front luminance and a change in hue (color shift) according to the viewing angle can be suppressed.
  • FIG. 2 is a cross-sectional view of an optical member according to another embodiment of the present invention.
  • the optical member 11 shown in FIG. 2 has a structure in which the high retardation layer 2 and the protective cover 3 are bonded together with an interlayer filling adhesive 5 interposed therebetween.
  • FIG. 3 is a cross-sectional view of an optical member according to still another embodiment of the present invention.
  • the antireflection film 6 may be provided on the viewer side of the protective cover 3.
  • an antireflection film usually used in the industry can be employed.
  • a layer made of a medium refractive index material, a layer made of a high refractive index material, and a layer made of a low refractive index material. can be employed.
  • the polarizing film 1 has a laminated structure of a polarizer and a protective layer. Specifically, in the laminated structure of the polarizing film 1, the high retardation layer 2, and the protective cover 3, a protective layer (not shown) may be provided on the protective cover 3 side of the polarizer. Further, another protective layer (not shown: hereinafter also referred to as an inner protective layer) may be provided on the opposite side of the polarizer from the protective cover 3.
  • the resin film forming the polarizer may be a single-layer resin film or a laminate of two or more layers.
  • polarizers composed of a single-layer resin film include hydrophilic polymer films such as polyvinyl alcohol (PVA) films, partially formalized PVA films, and ethylene / vinyl acetate copolymer partially saponified films.
  • PVA polyvinyl alcohol
  • polyene-based oriented films such as those subjected to dyeing treatment and stretching treatment with dichroic substances such as iodine and dichroic dyes, PVA dehydrated products and polyvinyl chloride dehydrochlorinated products.
  • a polarizer obtained by dyeing a PVA film with iodine and uniaxially stretching is used because of excellent optical properties.
  • the dyeing with iodine is performed, for example, by immersing a PVA film in an aqueous iodine solution.
  • the stretching ratio of the uniaxial stretching is preferably 3 to 7 times.
  • the stretching may be performed after the dyeing treatment or may be performed while dyeing. Moreover, you may dye
  • the PVA film is subjected to swelling treatment, crosslinking treatment, washing treatment, drying treatment and the like. For example, by immersing the PVA film in water and washing it before dyeing, not only can the surface of the PVA film be cleaned of dirt and anti-blocking agents, but the PVA film can be swollen to cause uneven staining. Can be prevented.
  • a polarizer obtained by using a laminate a laminate of a resin substrate and a PVA resin layer (PVA resin film) laminated on the resin substrate, or a resin substrate and the resin
  • a polarizer obtained by using a laminate with a PVA resin layer applied and formed on a substrate examples thereof include a polarizer obtained by using a laminate with a PVA resin layer applied and formed on a substrate.
  • a polarizer obtained by using a laminate of a resin base material and a PVA resin layer applied and formed on the resin base material may be obtained by, for example, applying a PVA resin solution to a resin base material and drying it.
  • a PVA-based resin layer is formed thereon to obtain a laminate of a resin base material and a PVA-based resin layer; the laminate is stretched and dyed to make the PVA-based resin layer a polarizer; obtain.
  • stretching typically includes immersing the laminate in an aqueous boric acid solution and stretching.
  • the stretching may further include, if necessary, stretching the laminate in the air at a high temperature (for example, 95 ° C. or higher) before stretching in the aqueous boric acid solution.
  • the obtained resin base material / polarizer laminate may be used as it is (that is, the resin base material may be used as a protective layer of the polarizer), and the resin base material is peeled from the resin base material / polarizer laminate.
  • Any appropriate protective layer according to the purpose may be laminated on the release surface. Details of a method for manufacturing such a polarizer are described in, for example, Japanese Patent Application Laid-Open No. 2012-73580. This publication is incorporated herein by reference in its entirety.
  • the thickness of the polarizer is typically 1 ⁇ m to 80 ⁇ m.
  • the upper limit of the thickness of the polarizer is preferably 50 ⁇ m, more preferably 35 ⁇ m, and particularly preferably 30 ⁇ m.
  • the lower limit of the thickness of the polarizer is preferably 1 ⁇ m, more preferably 3 ⁇ m.
  • the protective layer is formed of any suitable film that can be used as a protective layer for a polarizer.
  • the material as the main component of the film include cellulose resins such as triacetyl cellulose (TAC), polyester-based, polyvinyl alcohol-based, polycarbonate-based, polyamide-based, polyimide-based, polyethersulfone-based, and polysulfone-based materials.
  • transparent resins such as polystyrene, polynorbornene, polyolefin, (meth) acryl, and acetate.
  • thermosetting resins such as (meth) acrylic, urethane-based, (meth) acrylurethane-based, epoxy-based, and silicone-based or ultraviolet curable resins are also included.
  • a glassy polymer such as a siloxane polymer is also included.
  • a polymer film described in JP-A-2001-343529 (WO01 / 37007) can also be used.
  • a resin composition containing a thermoplastic resin having a substituted or unsubstituted imide group in the side chain and a thermoplastic resin having a substituted or unsubstituted phenyl group and nitrile group in the side chain for example, a resin composition having an alternating copolymer of isobutene and N-methylmaleimide and an acrylonitrile / styrene copolymer can be mentioned.
  • the polymer film can be, for example, an extruded product of the resin composition.
  • the protective layer may be subjected to surface treatment such as hard coat treatment, antireflection treatment, anti-sticking treatment, and antiglare treatment as necessary. Further / or, if necessary, the protective layer may be treated to improve visibility when viewed through polarized sunglasses (typically, an (elliptical) circular polarization function is added, an ultra-high phase difference is applied. Granting). By performing such processing, it is possible to improve the visibility when the display screen of the liquid crystal display device on which the optical member 10 is mounted is viewed through the polarized sunglasses.
  • surface treatment such as hard coat treatment, antireflection treatment, anti-sticking treatment, and antiglare treatment as necessary. Further / or, if necessary, the protective layer may be treated to improve visibility when viewed through polarized sunglasses (typically, an (elliptical) circular polarization function is added, an ultra-high phase difference is applied. Granting). By performing such processing, it is possible to improve the visibility when the display screen of the liquid crystal display device on which the optical member 10 is mounted is viewed
  • the thickness of the protective layer is typically 5 mm or less, preferably 1 mm or less, more preferably 1 ⁇ m to 500 ⁇ m, and even more preferably 5 ⁇ m to 150 ⁇ m.
  • the thickness of the protective layer is a thickness including the thickness of the surface treatment layer.
  • the inner protective layer is preferably optically isotropic.
  • “optically isotropic” means that the in-plane retardation Re (550) is 0 nm to 10 nm and the thickness direction retardation Rth (550) is ⁇ 10 nm to +10 nm.
  • the inner protective layer can be composed of any suitable material as long as it is optically isotropic. The material can be appropriately selected from the materials described above with respect to the protective layer, for example.
  • the thickness of the inner protective layer is preferably 5 ⁇ m to 200 ⁇ m, more preferably 10 ⁇ m to 100 ⁇ m, and still more preferably 15 ⁇ m to 95 ⁇ m.
  • Adhesive As the adhesive 4, any appropriate adhesive can be adopted.
  • the pressure-sensitive adhesive 4 is typically formed of an acrylic pressure-sensitive adhesive.
  • the high retardation layer 2 is made of a transparent material having birefringence.
  • the in-plane retardation of the high retardation layer 2 is 3000 nm or more and 30000 nm or less, and more preferably 10,000 nm or more.
  • the thickness of the high retardation layer 2 is arbitrary, preferably 25 ⁇ m to 500 ⁇ m, and more preferably 35 ⁇ m to 350 ⁇ m.
  • the angle formed by the slow axis of the high retardation layer 2 and the absorption axis of the polarizing film 1 is preferably 40 ° to 50 °, more preferably 42 ° to 48 °, and particularly preferably about 45 °. .
  • the high retardation layer 2 can be formed of any appropriate material.
  • the material include polyesters such as polyethylene terephthalate and polyethylene naphthalate, polycarbonate, polystyrene, polyether ether ketone, polyphenylene sulfide, and cycloolefin polymer.
  • polyesters typified by polyethylene terephthalate have a large intrinsic birefringence and can be suitably used because a large in-plane retardation can be obtained relatively easily even when the thickness is small.
  • the protective cover 3 is made of a transparent plastic material having birefringence.
  • the in-plane retardation of the protective cover 3 is 7000 nm or less.
  • the upper limit of the in-plane retardation of the protective cover 3 is preferably 5000 nm, more preferably 3000 nm, and particularly preferably 1000 nm.
  • the in-plane retardation of the protective cover 3 is greater than 0 nm.
  • the angle formed between the slow axis of the protective cover 3 and the absorption axis of the polarizing film 1 is not particularly limited.
  • the angle formed by the slow axis of the protective cover 3 and the absorption axis of the polarizing film 1 is typically substantially 0 °, substantially 45 °, or substantially 90 °.
  • the angle formed by the slow axis of the protective cover 3 and the absorption axis of the polarizing film 1 is preferably ⁇ 5 ° to 5 °, 40 ° to 50 °, or 85 ° to 95 °, more preferably. Is from -3 ° to 3 °, from 42 ° to 48 °, or from 87 ° to 93 °, particularly preferably about 0 °, about 45 °, or about 90 °.
  • the angle formed between the slow axis of the protective cover 3 and the absorption axis of the polarizing film 1 is substantially 45 °
  • the angle formed between the slow axis of the protective cover 3 and the slow axis of the high retardation layer 2 is substantially 0 ° or substantially 90 °.
  • the angle formed by the slow axis of the protective cover 3 and the absorption axis of the polarizing film 1 is preferably ⁇ 5 ° to 5 ° or 85 ° to 95 °, more preferably ⁇ 3 ° to 3 °. Or from 87 ° to 93 °, particularly preferably about 0 ° or about 90 °.
  • the thickness of the protective cover 3 is preferably 1000 ⁇ m or more, more preferably 2000 ⁇ m or more. By setting the thickness of the protective cover 3 to 1000 ⁇ m or more, the mechanical strength necessary for protecting the liquid crystal cell can be realized when the optical member 10 is provided on the viewer side of the liquid crystal cell of the liquid crystal display device. it can. Moreover, it is preferable that the thickness of the protective cover 3 is 4000 micrometers or less. Thereby, the liquid crystal display device can be made compact, and the protective cover 3 can be applied to a liquid crystal display device with a touch panel.
  • the value of S ⁇ T indicating the strength of the protective cover is preferably 400 or more. Preferably it is 500 or more, More preferably, it is 600 or more. On the other hand, the upper limit value of S ⁇ T is preferably 4000, and more preferably 2000.
  • the bending strength of the protective cover can be measured according to the bending test method of ASTM-D790.
  • the protective cover 3 may be bonded to the polarizing film 1 without leaving a gap, or may be provided with a gap between the protective cover 3 and the polarizing film 1.
  • the in-plane retardation of the high retardation layer 2 is 3000 nm to 30000 nm, and the angle formed by the slow axis of the high retardation layer 2 and the absorption axis of the polarizing film 1 is 40 ° to 50 °.
  • the in-plane phase difference of the protective cover 3 is 7000 nm or less.
  • the interlayer filling pressure-sensitive adhesive 5 may be an acrylic pressure-sensitive adhesive containing an acrylic polymer.
  • the content of the acrylic polymer in the interlayer filling adhesive 5 is not particularly limited, but is preferably 96% to 100% by weight, more preferably 98% to 100% by weight from the viewpoint of odor.
  • the acrylic polymer preferably has (meth) acrylic acid alkyl ester and / or (meth) acrylic acid alkoxyalkyl ester having a linear or branched alkyl group as an essential monomer component (monomer component). It is a structured acrylic polymer.
  • the specific constitution of the interlayer filling pressure-sensitive adhesive 5 is preferably 84 to 94% by weight of 2-ethylhexyl acrylate (2EHA), acrylic acid based on the total amount (100% by weight) of monomer components constituting the acrylic polymer.
  • This is an acrylic pressure-sensitive adhesive layer containing an acrylic polymer composed of a monomer component containing 5 to 15% by weight of (AA) and 0.03 to 0.15% by weight of dipentaerythritol hexaacrylate (DPHA).
  • i-OA isooctyl acrylate
  • An acrylic pressure-sensitive adhesive layer containing an acrylic polymer composed of a monomer component containing 5 to 15% by weight of acrylic acid (AA) and 0.03 to 0.15% by weight of dipentaerythritol hexaacrylate (DPHA) .
  • the thickness of the interlayer filling adhesive 5 is preferably 25 ⁇ m to 500 ⁇ m, more preferably 75 ⁇ m to 350 ⁇ m.
  • the 180 ° peeling adhesive strength (referred to as “adhesive strength (23 ° C.)”) at 23 ° C. of the interlayer filling adhesive 5 at 23 ° C. is preferably 5 N / 20 mm or more, more preferably 8 N / 20 mm or more. It is. By setting the adhesive force (23 ° C.) to 5 N / 20 mm or more, generation of delay bubbles (bubbles appearing at the interface with the protective cover) is suppressed.
  • the adhesive strength (23 ° C.) is measured by performing a 180 ° peel test (according to JIS Z0237 (2000), tensile speed: 300 mm / min) using a protective cover as an adherend at 23 ° C. Can do.
  • a liquid crystal display device includes a liquid crystal cell and the optical member according to any of items A to F arranged on the viewing side of the liquid crystal cell.
  • the optical member is disposed so that the polarizing film is on the liquid crystal cell side.
  • Example 1> 1 Production of Polarizing Plate A polyvinyl alcohol film having a thickness of 80 ⁇ m was stretched up to 3 times while being dyed for 1 minute in an iodine solution of 0.3% concentration at 30 ° C. between rolls having different speed ratios. Thereafter, the total draw ratio was stretched to 6 times while being immersed in an aqueous solution containing 60% at 4% concentration of boric acid and 10% concentration of potassium iodide for 0.5 minutes. Next, after washing by immersing in an aqueous solution containing potassium iodide at 30 ° C. and 1.5% concentration for 10 seconds, drying was performed at 50 ° C. for 4 minutes to obtain a polarizer. A polarizing plate (polarizing film) was prepared by bonding a saponified 80 ⁇ m thick triacetyl cellulose film on both surfaces of the polarizer with a polyvinyl alcohol adhesive.
  • Optical Member As a protective cover, a plastic cover (product name “NF2000”, manufactured by Mitsubishi Gas Chemical Company) having an in-plane retardation of 877 nm and a thickness of 1500 ⁇ m made of polycarbonate resin was used. As the high retardation layer, a high retardation film (product name “COSMO SHINE SRF” manufactured by Toyobo Co., Ltd.) having an in-plane retardation of 8400 nm and a thickness of 80 ⁇ m made of polyethylene terephthalate resin was used.
  • a plastic cover product name “NF2000”, manufactured by Mitsubishi Gas Chemical Company
  • COSMO SHINE SRF manufactured by Toyobo Co., Ltd.
  • the high retardation film and the polarizing plate were bonded together via an acrylic pressure-sensitive adhesive so that the angle ⁇ formed by the slow axis of the high retardation film and the absorption axis of the polarizing plate was 45 °. Furthermore, with respect to the high retardation film, the plastic cover is formed between the slow axis of the plastic cover and the absorption axis of the polarizing plate via an interlayer filling adhesive (product name “CS9864” manufactured by Nitto Denko Corporation). The optical member was obtained by pasting together so that the angle ⁇ was 0 °.
  • Example 2 An optical member was obtained in the same manner as in Example 1 except that a plastic cover (product name “PC1151” manufactured by Teijin Ltd.) with a thickness of 2000 ⁇ m made of polycarbonate resin was used as the protective cover. It was.
  • a plastic cover product name “PC1151” manufactured by Teijin Ltd.
  • T thickness of the protective cover
  • Example 3 Example 1 except that a plastic cover (product name “MR200” manufactured by Mitsubishi Rayon Co., Ltd.) having a thickness of 1500 ⁇ m made of polymethyl methacrylate resin was used as the protective cover. Thus, an optical member was obtained.
  • the bending strength of the protective cover measured according to the bending test method of ASTM-D790 is S (kgf / cm 2 ) and the thickness of the protective cover is T (mm)
  • the strength of the protective cover (S ⁇ T ) was 1425.
  • Example 4 As a protective cover, an in-plane retardation of 112.4 nm and a plastic cover with a thickness of 1500 ⁇ m made of a laminated structure of polymethyl methacrylate resin / polycarbonate resin / polymethyl methacrylate resin (product name “MT3LTR” manufactured by Kuraray Co., Ltd.) An optical member was obtained in the same manner as in Example 1 except that was used.
  • the bending strength of the protective cover measured according to the bending test method of ASTM-D790 is S (kgf / cm 2 ) and the thickness of the protective cover is T (mm), the strength of the protective cover (S ⁇ T ) was 1425.
  • ⁇ Comparative Example 1> Other than using a plastic cover (product name “HMR551T”, manufactured by Mitsubishi Gas Chemical Co., Inc.) having a thickness of 1450 ⁇ m and having a laminated structure of polymethyl methacrylate resin and polycarbonate resin as an in-plane retardation of 7605 nm. Obtained an optical member in the same manner as in Example 1.
  • the bending strength of the protective cover measured according to the bending test method of ASTM-D790 is S (kgf / cm 2 ) and the thickness of the protective cover is T (mm), the strength of the protective cover (S ⁇ T ) was 1377.
  • a light source, an optical member, and a polarizing plate are arranged in the same manner as the measurement of front luminance, and a conoscope (manufactured by AUTRONIC MELCHERS Co., Ltd.) is used in a polar angle of 0 ° to 60 ° Hue, x value, and y value at azimuth angles of 0 ° to 360 ° were measured.
  • a conoscope manufactured by AUTRONIC MELCHERS Co., Ltd.
  • the x value and y value at two arbitrary points are (x A , y A ) and (x B , y B ), and the following formula: ⁇ (x A ⁇ x B ) 2 + The maximum value of (y A -y B ) 2 ⁇ 1/2 was taken as the ⁇ xy value.
  • the polarizing plate was arranged so that the angle formed by the absorption axis of the polarizer and the absorption axis of the polarizer of the optical member was 45 °.
  • Table 1 shows the measurement results of the front luminance and color shift of the optical members of Examples 1 to 4 and Comparative Example 1
  • Table 2 shows the measurement results of the front luminance and color shift of the optical members of Comparative Examples 2 to 6.
  • Tables 1 and 2 show an xy chromaticity diagram (horizontal axis: x value, vertical axis: y value) and a color shift amount ( ⁇ xy value) as measurement results of the color shift.
  • the optical member of the present invention is suitably used for a liquid crystal display device mounted on a mobile phone, a portable information terminal, a digital camera, a video camera, a portable game machine, a car navigation system, a copy machine, a printer, a fax machine, a watch, a microwave oven, and the like. It is done.

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Polarising Elements (AREA)

Abstract

L'invention porte sur un élément optique qui permet d'empêcher des réductions de visibilité qui se produisent lorsqu'un dispositif d'affichage à cristaux liquides ayant un couvercle protecteur est vu à travers des lunettes de soleil polarisées. Cet élément optique est pourvu, dans l'ordre, d'un film polarisant, d'une couche à retard élevé et d'un revêtement protecteur. Le retard dans le plan de la couche à retard élevé est de 3000 nm à 30000 nm, l'angle formé par l'axe lent de la couche à retard élevé et l'axe d'absorption du film polarisant est de 40° à 50°, et le retard dans le plan du revêtement protecteur n'est pas supérieur à 7000 nm.
PCT/JP2017/023979 2016-07-08 2017-06-29 Élément optique et dispositif d'affichage à cristaux liquides WO2018008523A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP2016136204 2016-07-08
JP2016-136204 2016-07-08
JP2017-125802 2017-06-28
JP2017125802A JP2018013774A (ja) 2016-07-08 2017-06-28 光学部材及び液晶表示装置

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022158502A1 (fr) * 2021-01-20 2022-07-28 大日本印刷株式会社 Corps moulé en résine, stratifié l'utilisant et appareil d'affichage d'image
WO2023000292A1 (fr) * 2021-07-23 2023-01-26 京东方科技集团股份有限公司 Polariseur, dispositif d'affichage et procédé de fabrication d'un polariseur

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