US20070159576A1 - Optical device - Google Patents

Optical device Download PDF

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Publication number
US20070159576A1
US20070159576A1 US10/592,146 US59214605A US2007159576A1 US 20070159576 A1 US20070159576 A1 US 20070159576A1 US 59214605 A US59214605 A US 59214605A US 2007159576 A1 US2007159576 A1 US 2007159576A1
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Prior art keywords
film
optical device
protective film
polarizing film
polarizing
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US10/592,146
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English (en)
Inventor
Hirofumi Tanabe
Tatsufumi Watanabe
Katsuya Fujisawa
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Kuraray Co Ltd
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Kuraray Co Ltd
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Assigned to KURARAY CO., LTD. reassignment KURARAY CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: FUJISAWA, KATSUYA, TANABE, HIROFUMI, WATANABE, TATSUFUMI
Publication of US20070159576A1 publication Critical patent/US20070159576A1/en
Abandoned legal-status Critical Current

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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
    • G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
    • G02B5/3033—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid
    • G02B1/105—
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
    • G02B1/14—Protective coatings, e.g. hard coatings
    • 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
    • G02F1/133528—Polarisers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B2037/0092—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding in which absence of adhesives is explicitly presented as an advantage
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2310/00—Treatment by energy or chemical effects
    • B32B2310/08—Treatment by energy or chemical effects by wave energy or particle radiation
    • B32B2310/0806—Treatment by energy or chemical effects by wave energy or particle radiation using electromagnetic radiation
    • B32B2310/0831—Treatment by energy or chemical effects by wave energy or particle radiation using electromagnetic radiation using UV radiation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2329/00—Polyvinylalcohols, polyvinylethers, polyvinylaldehydes, polyvinylketones or polyvinylketals
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2331/00—Polyvinylesters
    • 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
    • G02F2201/00—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00
    • G02F2201/50—Protective arrangements

Definitions

  • This invention relates to an optical device having a laminate layer of a polyvinyl alcohol- or polyvinylene-base polarizing film and a protective film.
  • a polarizing plate which is one component of the optical device, has a structure in which transparent protective films are laminated to both sides of a polyvinyl alcohol base polarizing film in which iodine or a dye is adsorbed and oriented or a polyvinylene base polarizing film obtained by the dehydration of polyvinyl alcohol.
  • An adhesive has been used in laminating these layers together.
  • Various adhesives have been known for this purpose, examples of which include epoxy, acrylic, and urethane-base types, but there is a drawback in these adhesives generally not to have enough adhesion to stick to a polarizing film.
  • Vinyl acetate adhesives and polyvinyl alcohol adhesives have relatively good adhesion to a polarizing film, but these adhesives have a problem that the adhesive strength is affected by humidity.
  • liquid crystal display devices have sometimes become to be used under conditions of high temperature and humidity in outdoor or automotive applications, and this creates a need for a polarizing plate with high resistance to heat and moisture and with a high degree of polarization and high transmission for high-resolution color display.
  • a method to use a triacetyl cellulose film as a protective film on one side, and a polycarbonate resin film and/or a polymethyl methacrylate resin film as the other side protective film Japanese Laid-Open Patent Application H7-56017.
  • liquid crystal display devices obtained by bonding the above-mentioned polarizing plate to a liquid crystal cell. These are due to the birefringence of the liquid crystal molecules in the liquid crystal cell. Therefore, the birefringence of the liquid crystal molecules can be compensated for by disposing a retardation plate having a birefringence between the polarizing plate and the liquid crystal cell, and this can solve the above problems. Nevertheless, an adhesive layer is generally interposed in a lamination of the polarizing plate and the retardation plate, and this prevents further reduction of the laminate film thickness in a liquid crystal display device.
  • the inventors arrived at the present invention upon discovering that a polarizing film and a protective film can be directly laminated without having to use any adhesive including a pressure-sensitive adhesive. Specifically, it is an object of the present invention to provide an optical device with which film thickness and cost can be reduced and the production process can be simplified, by directly laminating a polarizing film and a protective film and, if necessary, a retardation plate, without any adhesive including a pressure-sensitive adhesive being interposed therebetween.
  • the optical device pertaining to the present invention has a protective film directly laminated, without any adhesive layer including a pressure-sensitive adhesive layer being interposed, to at least one side of a polyvinyl alcohol- or polyvinylene-base polarizing film.
  • the optical device further comprises a retardation plate, in which one of the protective films and the retardation plate are directly laminated, without any adhesive layer including a pressure-sensitive adhesive layer being interposed.
  • a retardation plate may be used as one of the protective films in the optical device.
  • the optical device pertaining to the present invention that at least one of the surfaces of the polarizing film, protective film, and retardation plate has been treated with energy rays having an energy of at least 5 eV.
  • the protective film on one side is a film composed of triacetyl cellulose, alicyclic polyolefin resin, or alicyclic acrylic resin
  • the protective film on the other side is a film composed of triacetyl cellulose, polycarbonate, polyethylene terephthalate, polyethylene naphthalate, (meth)acrylate resin, alicyclic polyolefin resin, or alicyclic acrylic resin.
  • the protective film is laminated to only one side of the polarizing film, it is a film composed of triacetyl cellulose, polycarbonate, polyethylene terephthalate, polyethylene naphthalate, (meth)acrylate resin, alicyclic polyolefin resin, or alicyclic acrylic resin.
  • a polarizing film and a protective film, and/or a protective film and a retardation plate, and/or a polarizing film and a retardation plate are directly laminated without the use of any adhesive including a pressure-sensitive adhesive, film thickness and cost can be reduced and the production process can be simplified. Also, with the present invention, because it is possible to laminate a polarizing film, a protective film, and a retardation plate that have no adhesiveness, without using any adhesive including a pressure-sensitive adhesive, various transparent films having no adhesiveness or pressure-sensitive adhesiveness can be used as a protective film and a retardation plate.
  • FIG. 1 is a vertical cross sectional view of a polarizing film pertaining to a first embodiment of the present invention, in which protective films are laminated on both sides of the polarizing film;
  • FIG. 2 is a vertical cross sectional view of a polarizing film pertaining to a second embodiment of the present invention, in which a protective film is laminated on only one side of the polarizing film;
  • FIG. 3 is a vertical cross sectional view of a polarizing film pertaining to a third embodiment of the present invention, which is equipped with a retardation plate;
  • FIG. 4 is a vertical cross sectional view of a polarizing film pertaining to a fourth embodiment of the present invention, which is equipped with a retardation plate.
  • FIG. 1 is a vertical cross sectional view of a polarizing plate pertaining to a first embodiment of the present invention
  • FIG. 2 is a vertical cross sectional view of a polarizing plate pertaining to a second embodiment of the present invention
  • FIG. 3 is a vertical cross sectional view of a polarizing plate pertaining to a third embodiment of the present invention, which is equipped with a retardation plate
  • FIG. 4 is a vertical cross sectional view of a polarizing plate pertaining to a fourth embodiment of the present invention, which is equipped with a retardation plate.
  • protective films a and c are laminated directly to both sides of a polarizing film b, without any adhesive layer or pressure-sensitive adhesive layer being interposed therebetween.
  • the protective film a is disposed on the opposite side from a liquid crystal cell face 11 a when mounted in the liquid crystal cell 11
  • the protective film c is disposed on the glass surface side of the liquid crystal cell 11 , that is, on the liquid crystal cell surface side 11 a .
  • the protective film a is laminated directly to only one side of the polarizing film b, without any adhesive including a pressure-sensitive adhesive interposed therebetween in the polarizing film in FIG. 2
  • Polyvinyl alcohol or polyvinylene base films are used as the polarizing film b that constitutes the polarizing plate 1 .
  • a polymer produced by saponifying a polyvinyl ester polymer obtained by polymerizing a vinyl ester monomer can be used as the polyvinyl alcohol polymer that forms the polyvinyl alcohol-base polarizing film, and vinyl acetate is preferably used as the vinyl ester monomer here.
  • a copolymerizable monomer can be copolymerized with said vinyl ester monomer as needed, to the extent that the effect of the present invention is not compromised.
  • the polyvinylene polymer that constitutes the polyvinylene polarizing film b can be one in which a polyene structure is formed by dehydrating said polyvinyl alcohol polymer, or by removing the hydrogen halide from a halogen-containing vinyl polymer such as polyvinyl chloride, or it can be one in which a polyene structure is formed by polymerizing a vinylene monomer such as acetylene, for example.
  • Examples of the protective films a and c that constitute the polarizing plate 1 include films composed of triacetyl cellulose and other such cellulose esters or derivatives thereof; polyethylene terephthalate, polyethylene naphthalate, and other such polyester films; polycarbonate films; polyethylene, polypropylene, and other such polyolefin films or polycycloolefin, norbornene resin, and other such alicyclic polyolefin films; films composed of polymethyl methacrylate, acrylic resins, or alicyclic acrylic resins; and ethylene vinyl alcohol films.
  • triacetyl cellulose is preferable.
  • a film in which two or more of the above resins are laminated or mixed can also be used.
  • the protective film c disposed on one side of the polarizing film b must be one with little birefringence effect, and to this end, films composed of triacetyl cellulose and other such cellulose esters or derivatives thereof, or polycycloolefins, norbornene resins, and other such alicyclic polyolefin films, or films composed of alicyclic acrylic resins are used, for example.
  • the protective film a disposed on the other side of the polarizing film b, that is, the opposite side from the liquid crystal cell, may be one that is transparent, and in addition to the above-mentioned films composed of triacetyl cellulose and other such cellulose esters or derivatives thereof, or polycycloolefins, norbornene resins, and other such alicyclic polyolefin films, or films composed of alicyclic acrylic resins, other films that can be used favorably include polyethylene terephthalate, polyethylene naphthalate, and other such polyester films; polyethylene, polypropylene, and other such polyolefin films; polycarbonate films; and films composed of polymethyl methacrylate, (meth)acrylate resins, and other such acrylic resins.
  • the retardation plate d examples include a retardation plate formed from a single crystal of mica, quartz, rock crystal, calcite, LiNbO 3 , LiTaO 3 , or another such material with birefringence; a retardation plate having a birefringent film on the surface of an underlying substrate, obtained by vapor depositing an inorganic material at an angle to a glass substrate or other such underlying substrate; a retardation plate having an LB (Langmuir-Blodget) film with birefringence; and a retardation plate formed by sandwiching between two glass substrates or by bonding to a glass substrate, in order to keep the film flat and in a constant shape, a retardation film obtained by drawing a transparent resin film made of triacetyl cellulose (TAC) or another such cellulose ester, polycarbonate polyvinyl alcohol (PVA), polyvinyl butyral (PVB), polyethylene terephthalate (PET), polypropylene (PP), polyallylate,
  • a polarizing film with excellent resistance to wet heat such as a polyvinylene base polarizing film or a polyvinyl alcohol base polarizing film containing a dichroic dye
  • an optical device 1 A with excellent wet heat resistance can be obtained either by directly laminating the retardation plate d to the surface of the protective film c on the liquid crystal cell side, without any adhesive layer including a pressure-sensitive adhesive layer interposed, as shown in FIG.
  • the surface of the protective film a on the observer's side, which is disposed on the outside of the polarizing film is subjected to an antiglare treatment and/or an antireflective treatment. This makes it easier for a user to view the liquid crystal cell.
  • the lamination is performed after the surfaces of the polarizing film, protective films, and retardation plate that are in contact with each other have been treated by being irradiated with energy rays having an energy of at least 5 eV, to prepare the optical devices 1 and 1 A pertaining to the present invention.
  • energy rays having an energy of at least 5 eV include ultraviolet rays, electron beams, and ion beams, of which the use of ultraviolet rays is preferable because of its simplicity.
  • Examples of ultraviolet ray sources include an excimer laser, a high-pressure mercury lamp, a low-pressure mercury lamp, a halogen lamp, and an excimer lamp.
  • Examples of the excimer lamp here include a dielectric barrier discharge lamp charged with argon, krypton, or xenon, or with a gas whose main component is argon, krypton, or xenon. Of these, the use of xenon is preferred.
  • the polarizing film surface and/or the protective film surface and/or the retardation plate surface during energy ray irradiation is in contact with a gas, in which case it is preferably brought into contact with at least one gas selected from among air, hydrogen, oxygen, nitrogen, ozone, hydrogen peroxide, water vapor, carbon dioxide, carbon monoxide, ammonia, nitrogen monoxide, nitrogen dioxide, inert gases such as argon, and low-boiling organic compounds such as ketones, alcohols, and hydrazine, or a mixture of these gases. It is preferable for the gas to be air because the operation will be simpler and the work easier.
  • lamination is preferably performed immediately after energy ray irradiation. It was also discovered that the effect of the energy ray irradiation will in some cases be diminished over time, but is improved by rinsing with water. Therefore, lamination may be performed after immersion in cold or hot water following energy ray irradiation.
  • Irradiation with energy rays having an energy of at least 5 eV readily breaks molecular bonds such as C-C and C-H and modifies the surface of resins, and this makes possible more secure, direct lamination without the use of an adhesive or pressure-sensitive adhesive. If the energy of the energy rays is less than 5 eV, adhesive strength will not be high enough.
  • the result of carrying out the above-mentioned surface treatment in at least one gas selected from among air, hydrogen, oxygen, nitrogen, ozone, hydrogen peroxide, water vapor, carbon dioxide, carbon monoxide, ammonia, nitrogen monoxide, nitrogen dioxide, inert gases such as argon, and low-boiling organic compounds such as ketones, alcohols, and hydrazine, or a mixture of these gases, is that the molecular bonds broken by the carbon component, oxygen component, nitrogen component, water, or the like in the atmosphere are surface modified to produce highly hydrophilic functional groups such as hydroxyl groups, amino groups, ketone groups, aldehyde groups, or carboxyl groups.
  • the breaking of C-C bonds, C-H bonds, or the like proceeds, forming an oligomer or low-molecular weight compound on the surface, and the surface has the adherent property.
  • the adherend surface of the polarizing film and/or the protective film and/or the retardation plate is irradiated with energy rays of at least 5 eV, after which two components of the films and plate are laminated together and then two surfaces are securely bonded and fixed, and therefore there is no need for an intermediate layer composed of an adhesive or pressure-sensitive adhesive to be interposed between the adherends, which means that direct lamination is possible.
  • This allows film thickness and cost to be reduced and the production process to be simplified, and furthermore, this gives a polarizing plate in which the decrease in light ray transmission does not occur as caused by the existence of an intermediate layer.
  • a xenon lamp made by Ushio U-Tech Inc. (UER200/HM172; energy of 7.3 eV) was used, and the polarizing film b in FIG. 1 was produced by adsorbing iodine to a polyvinyl alcohol film made by Kuraray Co. Ltd. and then drawing the film.
  • a triacetyl cellulose (TAC) film made by Fuji Photo Film Co. Ltd. was used for the protective films a and c on both sides of the polarizing film.
  • the distance between the xenon lamp and the triacetyl cellulose film was accurately adjusted to 2 mm, and irradiation with ultraviolet rays was performed in air for 30 seconds.
  • the contact angle between water and the polarizing film was measured with a contact angle meter made by Kyowa Interface Science Co. Ltd. (model CA-DT-A), and found to be 10° (at a temperature of 25° C. and a relative humidity of 50%).
  • the polarizing film and the protective films were laminated under a lamination pressure of 2.94 N/cm 2 , which gave the polarizing plate 1 (optical device).
  • the adhesive strength between the polarizing film and the protective films in this polarizing plate was measured by 90-degree peel test, which revealed that the adhesive strength at a film width of 50 mm was 0.49N.
  • Protective films were surface modified under the same conditions as in Example 1, and the polarizing film was also similarly subjected to the surface modification treatment. Next, the polarizing film and the protective films were laminated under a lamination pressure of 2.94 N/cm 2 , which gave a polarizing plate. The adhesive strength between the polarizing film and the protective films in this polarizing film was measured by 90-degree peel test, which revealed that the adhesive strength at a film width of 50 mm was 0.98N.
  • a polarizing film and protective films were surface modified under the same conditions as in Example 1. Next, the protective films were immersed in water, after which the polarizing film and the protective films were laminated under a lamination pressure of 2.94 N/cm 2 , which gave a polarizing plate. The adhesive strength between the polarizing film and the protective films in this polarizing plate was measured by 90-degree peel test, which revealed that the adhesive strength at a film width of 50 mm was 1.47N.
  • the polarizing film b and the surface modified protective film a on one side thereof as shown in FIG. 2 were laminated under a lamination pressure of 2.94 N/cm 2 , which gave a polarizing plate.
  • the adhesive strength between the polarizing film and the protective film in this polarizing plate was measured by 90-degree peel test, which revealed that the adhesive strength at a film width of 50 mm was 0.20 N.
  • a polyvinylene-base polarizing film obtained by dehydration of a polyvinyl alcohol made by Kuraray Co. Ltd. was used as the polarizing film.
  • a triacetyl cellulose (TAC) film made by Fuji Photo Film Co., Ltd. was used as the protective films.
  • the polarizing film and the protective films to be laminated to both sides of the polarizing film were surface modified in the same manner as in Example 2, and then the polarizing film and the protective films were laminated to obtain a polarizing plate.
  • the polarizing film was produced by adsorbing a dichroic dye to a polyvinyl alcohol film made by Kuraray Co. Ltd. and then drawing this product.
  • a triacetyl cellulose film made by Fuji Photo Film Co., Ltd. was used for the protective film c on the liquid crystal cell side, and a polyethylene terephthalate film made by Toyobo Co., Ltd. that had been subjected to an antireflective treatment was used for the protective film a on the observer's side.
  • the polarizing film and the protective films to be laminated to both sides of the polarizing film were surface modified in the same manner as in Example 2, and then the polarizing film and the protective films were laminated to obtain a polarizing plate.
  • the polarizing film was produced by adsorbing iodine to a polyvinyl alcohol film made by Kuraray Co. Ltd. and then drawing this product.
  • a triacetyl cellulose film made by Fuji Photo Film Co., Ltd. was used for the protective film c on the liquid crystal cell side, and a polycarbonate film made by Mitsubishi Engineering-Plastics Corporation was used for the protective film a on the observer's side.
  • the polarizing film and the protective films to be laminated to both sides of the polarizing film were surface modified in the same manner as in Example 2, and then the polarizing film and the protective films were laminated to obtain a polarizing plate.
  • TAC film and the Zeonor film were laminated to both sides of a polarizing film under a lamination pressure of 2.94 N/cm 2 , and the adhesive strength thereof was measured by 90-degree peel test, which revealed that the adhesive strength at a film width of 50 mm was 0.50 N.
  • a Zeonor film (a cycloolefin polymer) made by Zeon Corporation was used as the retardation plate d in FIG. 3 , the distance between a xenon lamp made by Ushio U-Tech Inc. and the Zeonor film was accurately adjusted to 2 mm, and irradiation with ultraviolet rays was performed in air for 30 seconds. Then, the TAC (protective film) of the polarizing plate obtained in Example 5 was also surface modified in the same manner as in Example 1, and was laminated with the Zeonor film d to obtain an optical device 1 A (polarizing plate with the retardation plate).
  • a polarizing film produced by adsorbing a dichroic dye to a polyvinyl alcohol film made by Kuraray Co. Ltd. and then drawing this product, and a Zeonor film made by Zeon Corporation were irradiated with ultraviolet rays under the same conditions as in Example 1.
  • the polarizing film and the Zeonor film were laminated under a lamination pressure of 2.94 N/cm 2 , and the adhesive strength thereof was measured by 90-degree peel test, which revealed that the adhesive strength at a film width of 50 mm was 0.20 N.
  • a Zeonor film (a cycloolefin polymer film) made by Zeon Corporation was used as the retardation plate d in FIG. 4 the distance between a xenon lamp made by Ushio U-Tech Inc. and the Zeonor film was accurately adjusted to 2 mm, and irradiation with ultraviolet rays was performed in air for 30 seconds. Then, the TAC (protective film) of the polarizing plate obtained in Example 4 was also surface modified in the same manner as in Example 1, and was laminated with the Zeonor film to obtain an optical device 1 A.
  • a xenon lamp made by Ushio U-Tech Inc. (UER200/HM172; energy of 7.3 eV) was used, a triacetyl cellulose (TAC) film made by Fuji Photo Film Co., Ltd. was used as the protective film a as shown in FIG. 4 , and a Zeonor film made by Zeon Corporation was used as the retardation plate d, the distance between the xenon lamp and the two films was accurately adjusted to 2 mm, and irradiation with ultraviolet rays was performed in air for 200 seconds.
  • Ushio U-Tech Inc. Ushio U-Tech Inc.
  • TAC triacetyl cellulose
  • the TAC film and the Zeonor film were laminated on both sides of the polarizing film b as shown in Example 1 under a lamination pressure of 2.94 N/cm 2 , and the adhesive strength thereof was measured by 90-degree peel test. As a result, the Zeonor film was broken at a width of 50 mm.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Polarising Elements (AREA)
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EP (1) EP1724617B1 (zh)
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US20160229135A1 (en) * 2013-09-30 2016-08-11 Lg Chem, Ltd. Method for manufacturing nearly-natural black polarizing plate and polarizing plate manufactured thereby
US20160334663A1 (en) * 2015-01-22 2016-11-17 Boe Technology Group Co., Ltd. Liquid crystal display panel
US9658377B2 (en) 2010-12-28 2017-05-23 Zeon Corporation Phase difference film layered body and method for producing the same having micrometer-scale particles in a subsequently-removed layer
US20180004254A1 (en) * 2014-12-26 2018-01-04 Samsung Electronics Co., Ltd. Window cover and display apparatus having the same and method of manufacturing display apparatus
US11209694B2 (en) * 2018-09-30 2021-12-28 HKC Corporation Limited Polarizing structure and display device

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WO2005085918A1 (ja) 2005-09-15
CN1930500A (zh) 2007-03-14

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