WO2001046720A1 - Plaque polarisante elliptique, procede de production de cette plaque polarisante et affichage a cristaux liquides comprenant cette derniere - Google Patents

Plaque polarisante elliptique, procede de production de cette plaque polarisante et affichage a cristaux liquides comprenant cette derniere Download PDF

Info

Publication number
WO2001046720A1
WO2001046720A1 PCT/JP2000/009097 JP0009097W WO0146720A1 WO 2001046720 A1 WO2001046720 A1 WO 2001046720A1 JP 0009097 W JP0009097 W JP 0009097W WO 0146720 A1 WO0146720 A1 WO 0146720A1
Authority
WO
WIPO (PCT)
Prior art keywords
liquid crystal
crystal polymer
polarizing plate
polymer layer
film
Prior art date
Application number
PCT/JP2000/009097
Other languages
English (en)
Japanese (ja)
Other versions
WO2001046720A8 (fr
Inventor
Toshihiro Ichizuka
Hiroyasu Ishikawa
Original Assignee
Nippon Petrochemicals Co., Ltd.
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.)
Filing date
Publication date
Priority claimed from JP36537899A external-priority patent/JP2001183525A/ja
Priority claimed from JP36537999A external-priority patent/JP2001183526A/ja
Application filed by Nippon Petrochemicals Co., Ltd. filed Critical Nippon Petrochemicals Co., Ltd.
Publication of WO2001046720A1 publication Critical patent/WO2001046720A1/fr
Publication of WO2001046720A8 publication Critical patent/WO2001046720A8/fr

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G02B5/3016—Polarising elements involving passive liquid crystal elements

Definitions

  • the present invention relates to an elliptically polarizing plate used to enhance the display performance of a liquid crystal display device, a method for manufacturing the same, and a liquid crystal display device using the same.
  • Liquid crystal display devices have the advantages of thinness, light weight, and low power consumption.However, for example, complete black-and-white display has not been achieved with the STN type liquid crystal display device. At present, liquid crystal display devices with excellent display performance have not yet been realized.
  • Some means for improving the display performance of the liquid crystal display device have been proposed.
  • One of them is to arrange a retardation film between the polarizing plate and the liquid crystal cell of the liquid crystal display device.
  • This method has an advantage that the method can be easily carried out simply by bonding a retardation film to a polarizing plate to form an elliptically polarizing plate without significantly changing the manufacturing process of the liquid crystal display device.
  • the thickness is increased by the amount of the retardation film and the adhesive layer for laminating the retardation film, and when wound into rolls in the manufacturing process of elliptically polarizing plates, the amount of winding per roll is reduced and productivity is poor.
  • the thickness of the liquid crystal layer and the thickness of the final product increase.
  • the interface between the polarizing plate and the retardation film may peel off under high-temperature or high-humidity conditions due to differences in the expansion and contraction behavior of each layer due to heat and humidity.
  • JP-A-4-157017 and JP-A-6-224317 propose an optically anisotropic element in which a liquid crystalline polymer is fixed in orientation.
  • a liquid crystalline polymer since the orientation axis angle can be set arbitrarily, various elliptically polarizing plates can be manufactured by continuously laminating a long film form.
  • the thickness of the elliptically polarizing plate may increase, and the interface between the polarizing plate and the optically anisotropic element may be broken under high-temperature or high-humidity conditions.
  • Japanese Patent Application Laid-Open No. Hei 8-277841 describes a liquid crystal polymer layer transferred onto a peelable substrate. This method may simplify the layer structure and reduce the total film thickness, but if an elliptically polarizing plate with excellent optical performance, quality, and durability under high temperature and high humidity conditions cannot be obtained, There was.
  • An object of the present invention is to reduce the thickness by simplifying the layer structure of an elliptically polarizing plate, to prevent problems such as peeling even under high temperature and high humidity conditions, and to further improve optical characteristics.
  • Elliptically polarizing plate that can be continuously bonded from a long film by setting the orientation axis angle of the element to the absorption axis of the polarizing plate, a method of manufacturing the same, and a liquid crystal display using the same It is to provide a device.
  • a first aspect of the present invention is an elliptically polarizing plate having a liquid crystal polymer layer and a polarizing element, wherein the optically anisotropic element (a) having a liquid crystal polymer layer oriented on a cellulose triacetate film and a light-transmitting protective element are provided.
  • An elliptically polarizing plate characterized in that a polarizing element is sandwiched between the film and the film (b), and the optically anisotropic element is subjected to a vulcanization process.
  • a second aspect of the present invention is the above-mentioned elliptically polarizing plate, wherein a light-transmitting overcoat layer is provided on the surface of the liquid crystal polymer layer.
  • a third aspect of the present invention is the above-mentioned elliptically polarizing plate, wherein the light-transmitting overcoat layer is made of an acryl-based resin.
  • a fourth aspect of the present invention resides in the above-mentioned elliptically polarizing plate, wherein the liquid crystal polymer layer is made of optically positive uniaxial liquid crystal molecules.
  • a fifth aspect of the present invention is the above-mentioned elliptical polarization, wherein the orientation direction of the liquid crystal polymer near one of the two surfaces of the liquid crystal polymer layer is not parallel to the MD direction.
  • a sixth aspect of the present invention is the above-mentioned elliptically polarizing plate, wherein the optically anisotropic element, the translucent protective film, and the polarizing element are in the form of a long film.
  • a seventh aspect of the present invention is to form a liquid crystal polymer layer on a cellulose triacetate film
  • an optically anisotropic element is manufactured by providing a translucent overcoat layer on the surface of the liquid crystal polymer layer, and then the optically anisotropic element is subjected to a vulcanization treatment. Thereafter, the polarizing film is interposed with an adhesive layer. And bonding the optically anisotropic element and the light-transmitting protective film so as to be sandwiched therebetween.
  • An eighth aspect of the present invention resides in a liquid crystal display device characterized in that the elliptically polarizing plate is disposed on at least one surface of a liquid crystal cell.
  • a ninth aspect of the present invention is a method for producing an elliptically polarizing plate having a liquid crystal polymer layer and a polarizing element, wherein the liquid crystal polymer layer supported on a substrate which can be separated from the polarizing element is separated by an adhesive layer.
  • a method for manufacturing an elliptically polarizing plate characterized by laminating.
  • a tenth aspect of the present invention is the ninth method, wherein the surface of the liquid crystal polymer layer formed on the removable substrate is protected by a transparent overcoat layer.
  • the eleventh aspect of the present invention resides in the tenth method, wherein the translucent overcoat layer is made of an acrylic resin.
  • a twelfth aspect of the present invention is the method according to any one of the ninth to eleventh aspects, wherein the liquid crystal polymer layer is made of optically positive uniaxial liquid crystal molecules.
  • a thirteenth aspect of the present invention is the liquid crystal display device according to the ninth to eleventh features, wherein the alignment direction of the liquid crystal polymer in the vicinity of one of the two side surfaces of the liquid crystal polymer layer is not parallel to the MD direction. Is in one of the ways.
  • a liquid crystal polymer layer supported on a removable substrate is a long filter.
  • the present invention is directed to any one of the ninth to thirteenth methods in which the bonding is performed continuously in a lume form.
  • a fifteenth aspect of the present invention is a liquid crystal display device characterized in that an elliptically polarizing plate manufactured by any one of the ninth to fourteenth methods is disposed on at least one surface of a liquid crystal cell.
  • FIG. 1 A shows the above-described first to eighth typical examples of the present invention, and B shows the ninth to 13th typical examples.
  • protective film (T AC) is a protective film, and a typical example thereof is a cellulose triacetate (T AC) film.
  • Polyizing film indicates a typical example of a polarizing element.
  • O C layer means (translucent) over-coat layer.
  • Trip adhesive means either an adhesive or an adhesive.
  • the liquid crystal polymer layer used in the elliptically polarizing plate of the present invention can be obtained, for example, by cooling a liquid crystal polymer oriented on an alignment treatment substrate to a glass transition temperature (T g) or lower and fixing the orientation.
  • T g glass transition temperature
  • the thermotropic liquid crystal polymer used must be able to maintain the molecular alignment state of the liquid crystal phase even when cooled from the molten state (liquid crystal state) to Tg or less.
  • the liquid crystal phase of the liquid crystal polymer when melted may have any molecular arrangement structure such as smectic, nematic, twisted nematic, and cholesteric.
  • the liquid crystal phase has a homogenous alignment and a homeotropic alignment near the alignment substrate and the air interface, respectively.
  • liquid crystal polymer for example, a liquid crystal polymer having a mesogen in the main chain such as polyester, polyamide, polycarbonate, and polyesterimide, or a side of polyacrylate, polymethacrylate, polymalonate, polysiloxane, etc. Examples thereof include a liquid crystal polymer having a mesogen in a chain.
  • polyester a polymer containing an orf-substituted aromatic unit as a constituent component is most preferable, but a polymer containing as a constituent component an aromatic unit having a bulky substituent in place of the ortho-substituted aromatic unit can also be used.
  • Twisted nematic alignment can be achieved by introducing an optically active unit into the liquid crystal polymer chain or by blending an optically active compound.
  • Even oligomers and low molecular weight compounds are thermally crosslinked or photocrosslinked in a state where they are cooled to a liquid crystal state or liquid crystal transition temperature or lower and are fixed in orientation by introducing a crosslinkable group or blending an appropriate crosslinking agent.
  • Liquid crystal polymers that can be polymerized by such means are also included in the liquid crystal polymers. Further, even a discotic liquid crystal compound can be used without any problem.
  • liquid crystal polymer one having optically positive or negative uniaxiality is usually used. Their optical properties are appropriately selected depending on the functions required of the elliptically polarizing plate. In the case of a liquid crystal polymer layer having a twisted nematic orientation, a liquid crystal polymer exhibiting positive uniaxiality is preferably used. .
  • the T g of the liquid crystal polymer is preferably room temperature or higher, and more preferably 50 ° C. or higher, since it affects the alignment stability after the alignment is fixed. T g can be adjusted by the type of monomer used in the liquid crystal polymer, monomer ratio, polymerization conditions and the like, but can also be adjusted by using the above-mentioned crosslinking means in combination.
  • the triacetate cell aperture film used for the optically anisotropic element of the embodiment A of FIG. 1 (the first to eighth aspects of the present invention) is basically used as a transparent support film, and the elliptically polarizing plate mainly has a color. When used for compensation, it is desirable that the optical anisotropy be as small as possible. When used for viewing angle compensation, those having optical characteristics that complement the optical characteristics of the liquid crystal polymer layer can be used, and those that are optically negative uniaxial or biaxial are usually used. Can be
  • a method for forming a liquid crystal polymer layer on a cellulose triacetate film includes a method in which a liquid crystal polymer is aligned on an alignment-treated cellulose triacetate film and a liquid crystal polymer layer is directly formed on the film.
  • a method b in which a liquid crystal polymer is oriented on another orientation substrate to form a liquid crystal polymer layer, and then the layer is transferred onto a cellulose triacetate film.
  • a cellulose triacetate film provided with an organic or inorganic alignment film is preferably used. Examples of the organic alignment film include a polyvinyl alcohol-polyimide derivative.
  • the surface provided with the alignment film is subjected to an alignment process such as a rubbing process.
  • the alignment substrate may be, for example, a thermosetting resin such as polyimide, epoxy resin, or phenol resin, a polyamide such as nylon; a polyether imide; a polyether ketone; a polyether ether ketone (PEEK); Polyketone; Polyether sulfone; Polyphenylene sulfide; Polyphenylene oxide; Polyester such as polyethylene terephthalate and polybutylene terephthalate; Polyacetal; Polyacrylonitrile; Poly (meth) acrylate; A polymer film exemplified by a thermoplastic resin such as polyvinyl alcohol can be used. Further, an organic thin film made of another resin described above may be formed on the surface of the polymer film.
  • a thermosetting resin such as polyimide, epoxy resin, or phenol resin
  • a polyamide such as nylon
  • PEEK polyether ether ketone
  • Polyketone Polyether sulfone
  • Polyphenylene sulfide Polyphenylene oxide
  • the polymer film is subjected to an orientation treatment such as a rubbing treatment and provided to an oriented substrate.
  • an orientation substrate is also used in the embodiment B.
  • such an alignment substrate is not suitable for use in an optically anisotropic element from the viewpoint of optical isotropic properties, translucency, and physical characteristics. Therefore, a liquid crystal polymer layer is formed on a cellulose triacetate film. To obtain an optically anisotropic element.
  • a rubbing treatment is usually applied to align a liquid crystal polymer on an alignment substrate (hereinafter, including cellulose triacetate film).
  • an alignment substrate hereinafter, including cellulose triacetate film.
  • the rubbing treatment can be performed at a predetermined arbitrary angle with respect to the MD direction of the long oriented substrate.
  • the angle of the rubbing direction with respect to the MD direction is appropriately set according to the function of the elliptically polarizing plate.
  • the rubbing is usually performed in an oblique direction with respect to the MD direction. Is preferred.
  • the angle of the oblique direction is preferably in the range of 144 degrees to +45 degrees.
  • the rubbing treatment can be performed by an arbitrary method, for example, a rubbing roll is arranged at an arbitrary angle with respect to the MD direction of the long film on a stage for transporting the long film in the MD direction, and the film is removed.
  • the rubbing roll is rotated while being conveyed in the MD direction, and the film surface is rubbed.
  • Rubbing roll and stage This is a mechanism that can freely adjust the angle formed by the moving direction of the rubbing roll, and an appropriate rubbing cloth material is attached to the surface of the rubbing roll.
  • a method of forming a liquid crystal polymer layer by bringing the liquid crystal polymer into contact with the rubbed surface of the alignment substrate for example, a method of dissolving the liquid crystal polymer in an appropriate solvent, coating and drying, or A method of directly extruding a liquid crystal polymer with a T-die or the like is used. From the viewpoint of the uniformity of the film thickness, a method of applying a solution and drying is appropriate.
  • the method for applying the liquid crystal polymer solution is not particularly limited, and examples thereof include a die coating method, a slot die coating method, a slide die coating method, a roll coating method, and a bar coating method.
  • a dipping pulling method or the like can be adopted.
  • the solvent is removed by an appropriate drying method to form an unoriented liquid crystal polymer layer.
  • the liquid crystal polymer is oriented by heating at a predetermined temperature for a predetermined time, and then cooled to a temperature of T g or less to form a liquid crystal polymer layer having a fixed orientation.
  • the thickness is not particularly limited as long as the function of the elliptically polarizing plate is exhibited, and is approximately 0.05 m to 100 / m, preferably approximately 0.1 001 to 3001. is there.
  • any adhesive can be used as long as it is translucent and optically isotropic, and examples thereof include acrylic, epoxy, ethylene monoacetate, and rubber adhesives.
  • an acrylic adhesive is preferably used.
  • the liquid crystal polymer layer having a fixed orientation formed on the cellulose triacetate film is made of a light-curing, electron beam-curing or thermosetting acrylic resin to protect the surface.
  • An overcoat layer is provided.
  • the liquid crystal polymer layer is formed by a method such as crosslinking, it may not be necessary to provide a translucent overcoat layer.
  • an elliptically polarizing plate is manufactured by using an optically anisotropic element as a protective film for a polarizing element.
  • the number of layers constituting the elliptically polarizing plate can be reduced as compared with the case where the optically anisotropic element is bonded to the polarizing plate whose both sides of the polarizing element are protected by the cellulose triacetate film.
  • the influence of shrinkage strain of each layer due to heat or humidity is reduced, and defects such as peeling at the bonded interface can be eliminated.
  • the optically anisotropic element is subjected to a curing treatment before bonding to the polarizing element.
  • the aging treatment is usually performed by contacting with an aqueous alkali solution.
  • aqueous alkali solution potassium hydroxide, sodium hydroxide, or the like is used.
  • the concentration of the alkali is about 0.1 to 10%, preferably about 0.5 to 5%, and more preferably about 1 to 3%.
  • a dilute solution of about% is sufficient.
  • mild conditions of 1 to 60 minutes at room temperature, preferably 30 minutes or less, more preferably 15 minutes or less are sufficient. If the overcoat layer is provided on the liquid crystal polymer layer, the liquid crystal polymer layer is not eroded or damaged in the curing step.
  • polarizing element used in the present invention an element obtained by adsorbing a polarizing element such as iodine or a dichroic dye on a base material such as a stretched PVA film is generally used.
  • a polarizing element is formed as a polarizing plate with both sides sandwiched by protective films, and usually, a single film of triacetate cell orifice is used as the protective film.
  • an elliptically polarizing plate can be obtained by using the above-described optically anisotropic element as a protective film on at least one surface of the polarizing element.
  • the polarizing element and the optically anisotropic element are bonded together with an acrylic, SBR, or silicone adhesive or adhesive.
  • the optically anisotropic element can be bonded to the polarizing element either on the liquid crystal polymer layer side where the translucent overcoat layer is provided or on the cellulose triacetate film side. And a polarizing element are preferably attached to each other.
  • the translucent protective film used in the present invention the above optically anisotropic element is used. Power that can be used ⁇ It is preferable to use a light-transmissive film with low optical anisotropy, which is marketed under the trade names of ZONEX, ART ⁇ N, FUJITAC, etc., with small birefringence.
  • the translucent protective film and the polarizer are formed in the same manner as in the case of bonding an optically anisotropic element.
  • the liquid crystal polymer layer formed on the alignment substrate film is then transferred to a removable substrate.
  • This method is a method in which the liquid crystal polymer layer is transferred to a detachable substrate by using an appropriate adhesive.
  • This adhesive layer is optically isotropic, has an adhesive force on both the liquid crystal polymer layer and the peelable substrate after curing, and has another substrate bonded to the liquid crystal polymer layer side. In this case, there is no particular limitation as long as the detachable substrate can be detached even after bonding. Examples of such adhesives include photo-curable, electron beam-curable, and thermo-curable adhesives, and among them, photo-curable acrylic adhesives are preferred.
  • the cured adhesive layer also functions as an overcoat layer for protecting the liquid crystal polymer layer.
  • the releasable substrate used in the present invention is not particularly limited as long as it is a substrate having releasability and self-supporting property, but usually, a plastic film is used.
  • the term “releasability” as used in the present invention means that, when the liquid crystalline polymer layer and the substrate are bonded via an adhesive, an appropriate adhesive force is maintained, and when the substrate is separated, the resin is cured. It means that separation is possible at the interface between the adhesive layer and the substrate.
  • the peelable substrate film used in the present invention usually has a peel strength at an interface with an adhesive (after curing) of 180 ° (a 180 ° peel test, a peeling speed of 30 cmZ), which is usually 0.1 ⁇ m. 5 to 8 ON / 25 mm.
  • a separation strength of 2 to 50 NZ 25 mm is used.
  • the plastic film suitable as the detachable substrate include polyethylene, polypropylene, and olefin-based resins such as 4-methylpentene-11 resin, polyamide, polyimide, polyamide amide, polyether imide, and polyether imide.
  • Ether ketone polyether ether ketone, polyether sulfone, polyketone sulfide, polysulfone, polystyrene, polyphenylene sulfide, polyphenylene oxide, polyethylene terephthalate, polybutylene terephthalate, polyarylate, polyacetal, polycarbonate
  • the Poly Binni Alcohol, cellulosic plastics and the like are examples of the like.
  • plastic films may be used by themselves, or those coated with silicone, organic or inorganic thin films, or chemically-coated ones to provide appropriate release properties. Those that have been subjected to a treatment or those that have been subjected to a physical treatment such as corona discharge treatment can be used.
  • polypropylene, polyether ether ketone, polyethylene terephthalate, polycarbonate, and plastic films obtained by subjecting these film surfaces to silicone treatment or corner discharge treatment have both an adhesive and appropriate adhesiveness and releasability. This is desirable.
  • a liquid crystal polymer layer formed on a substrate that can be separated from the polarizing element and whose surface is protected by a translucent overcoat layer is an adhesive represented by an acrylic, SBR, or silicon
  • the elliptically polarizing plate of the present invention is obtained by laminating with an adhesive.
  • a light-transmitting overcoat layer made of a photocurable, electron beam-curable or thermosetting acryl-based resin is provided. If an elliptically polarizing plate is manufactured without providing a light-transmitting overcoat layer, the liquid crystal polymer layer may be damaged, and an elliptically polarizing plate with excellent optical performance and quality may not be obtained.
  • the polarizing element may be supplied in a form in which both sides are protected by a triacetate cell mouth film, or after the polarizing element and the liquid crystal polymer layer are directly bonded, the peelable substrate film is removed, and then Both sides of the polarizing element side and the liquid crystal polymer layer side may be protected with a cellulose triacetate film.
  • an elliptically polarizing plate can be obtained by removing the substrate film that can be separated at an appropriate time after lamination with the polarizing element.
  • the liquid crystal polymer layer (optically anisotropic element) can be continuously supplied in the form of a long film.
  • the lamination operation can be performed continuously.
  • the liquid crystal polymer layer (optically anisotropic element) and the polarizing element it is necessary to stack the transmission axis of the polarizing element and the alignment axis near either one of the two interfaces of the liquid crystal polymer layer at a specific angle.
  • the liquid crystal polymer layer of the present invention can set the orientation angle in any direction, It is possible to laminate one after the other in the MD direction.
  • the elliptically polarizing plate of the present invention is arranged in a liquid crystal cell, it is necessary that the liquid crystal polymer layer side of the elliptically polarizing plate be on the liquid crystal cell side.
  • the elliptically polarizing plate in the present invention includes a so-called circularly polarizing plate and a linearly polarizing plate.
  • liquid crystal polymer solution 2 A 1 Owt% methylene chloride solution of the side chain type acrylic polymer represented by the formula (II) was prepared.
  • a rubbing roll of 150 mm ⁇ around which a rayon cloth is wound is set at an angle, and continuously rotated by rotating at high speed. Perform rubbing, and align the substrate with a rubbing angle of 45 °. I got Irum.
  • the rubbing angle is an angle clockwise from the MD direction when the rubbing surface is viewed from above.
  • the solution obtained in Liquid Crystal Polymer Solution Preparation Example 1 was continuously applied on the alignment substrate film using a die coater and dried to form an unoriented liquid crystal polymer layer. The liquid crystal polymer was aligned by heat treatment at 100 ° C. for 10 minutes, and then cooled to room temperature to fix the alignment.
  • This liquid crystal polymer layer had a twisted nematic orientation, a twist angle of 230 ° and an And of 0.84 m.
  • the liquid crystal polymer layer was transferred to an uncured 80 m-thick cellulose triacetate film using an ultraviolet-curable acrylic adhesive.
  • the same acryl-based adhesive was applied to the surface of the liquid crystal polymer layer for surface protection and then cured to form a light-transmitting overcoat layer.
  • an optically anisotropic element A having a total thickness of about 100 ⁇ m was obtained.
  • Alkyl-modified polyvinyl alcohol is applied to a long, 80-inch thick cellulose triacetate film that has not been subjected to oxidation treatment, dried, and then subjected to a rubbing treatment in the same manner as in the production example of optical anisotropic element A.
  • a rubbing treatment in the same manner as in the production example of optical anisotropic element A.
  • the solution prepared in Preparation Example 2 of the liquid crystal polymer solution was applied to the alignment substrate film, dried, and then subjected to a heat alignment treatment to fix the alignment of the liquid crystal polymer layer.
  • This liquid crystal polymer layer was in a nematic orientation, and the An was 0.8 ⁇ m.
  • An UV-curable acrylic adhesive was applied to the liquid crystal polymer layer side for surface protection to obtain an optically anisotropic element B having a total thickness of about 100 / m.
  • optically anisotropic element A was immersed in a 2% aqueous hydration solution at room temperature for 5 minutes to carry out a curing treatment, washed in running water, and dried.
  • a cured optically anisotropic element A is continuously attached to one side of a polarizing element in which iodine is adsorbed on stretched polyvinyl alcohol using an acrylic adhesive such that the liquid crystal polymer layer is on the outside.
  • An elliptically polarizing plate A of the present invention was produced by bonding a cured cellulose triacetate film to the other surface of the polarizing element. The total film thickness was about 200 m. Optical inspection of the elliptically polarizing plate A showed no damage such as spots or scratches on the liquid crystal polymer layer.
  • optically anisotropic element A side of this elliptically polarizing plate A is attached to a glass plate via an ataryl adhesive, put in a constant temperature and humidity chamber at 60 ° C and 90% RH, and taken out after elapse of 500 hours. Observation revealed no abnormalities such as peeling or bubbles.
  • Example 2 Preparation of elliptically polarizing plate B:
  • An elliptically polarizing plate B was obtained in the same manner as in Example 1 except that the optically anisotropic element B was used instead of the optically anisotropic element A.
  • the total film thickness was about 20 Om.
  • Optical examination of this elliptically polarizing plate B showed no damage such as spots or scratches on the liquid crystal polymer layer.
  • the optically anisotropic element B side of the elliptically polarizing plate B is attached to a glass plate via an ataryl adhesive, put in a constant temperature and humidity chamber at 60 ° C and 90% RH, and taken out after elapse of 500 hours. Upon observation, no abnormalities such as peeling or foaming were observed.
  • Example 3 Preparation of elliptically polarizing plate C:
  • An elliptically polarizing plate C was obtained in the same manner as in Example 1 except that the optically anisotropic element C was used instead of the optically anisotropic element A.
  • the total film thickness was about 200 / m.
  • Optical inspection of the elliptically polarizing plate C showed no damage such as spots or scratches on the liquid crystal polymer layer.
  • the optically anisotropic element C side of the elliptically polarizing plate C is adhered to a glass plate via an acrylic adhesive, placed in a constant temperature and humidity chamber at 60 ° C and 90% RH, and taken out after a lapse of 500 hours. Upon observation, no abnormalities such as peeling or foaming were observed.
  • Example 4
  • a liquid crystal display device was manufactured.
  • the elliptically polarizing plate C is arranged on both sides of the optically anisotropic element C such that the side of the optically anisotropic element C is close to the driving liquid crystal cell, and the rubbing direction of the optically anisotropic element C and the orientation angle of the liquid crystal adjacent to the liquid crystal cell are 90 °. It was arranged so that it might become.
  • the driving liquid crystal cell used ZL 1-47992 as the liquid crystal material, and the cell parameters were cell gap 4.8 ⁇ m, twist angle 90 ° (left twist), and pretilt angle 4 °. The viewing angle characteristics of this liquid crystal display device were wider than those without the optically anisotropic element C.
  • Optical anisotropic element E was obtained in exactly the same manner as in optical anisotropic element A, except that an acrylic adhesive for surface protection was not applied to the liquid crystal polymer layer.
  • Elliptically polarized light obtained by adhering an optically anisotropic element D to one side of the polarizing element so that the liquid crystal polymer layer is on the outside, and adhering a cellulose triacetate film to the other side in accordance with Example 1.
  • Plate D was obtained.
  • An acrylic adhesive was applied to the optically anisotropic element D side of the elliptically polarizing plate D and attached to a glass plate, and the same tests as in Examples 1 and 2 were performed. Peeling was observed between the polarizing element and the cellulose triacetate surface of the optically anisotropic element D.
  • Comparative Example 2 (Preparation of elliptically polarizing plate E): The optically anisotropic element E was immersed in a 2% aqueous hydroxide solution at room temperature for 5 minutes to carry out a curing treatment, washed in running water, and dried.
  • a cured cellulose triacetate film was attached to both sides of a polarizing element in which iodine was adsorbed to the stretched polyvinyl alcohol, to produce a polarizing plate.
  • the elliptically polarizing plate F was manufactured by continuously bonding the liquid crystal polymer layer side of the optically anisotropic element B to this polarizing plate via an acrylic-based adhesive without subjecting it to a vulcanizing treatment.
  • the elliptically polarizing plate F is as thick as about 300 xm and the winding thickness is large, so that the processing length in one operation must be shorter than that of the elliptically polarizing plates of Examples 1 and 2. Was not obtained.
  • An acryl-based adhesive was applied to the optically anisotropic element B side of the elliptically polarizing plate F and attached to a glass plate, and the same test as in Example 2 was carried out. .5 mm peeling was observed.
  • This liquid crystal polymer layer had a twisted nematic orientation, a twist angle of ⁇ 230 ° and an And of 0.84 m.
  • An ultraviolet-curable acryl-based adhesive is applied to the liquid crystal polymer layer on the PEEK film, bonded to a polyethylene terephthalate (PET) film, cured, separated from the PEEK film, and the liquid crystal polymer layer is PET. Transcribed on film Was. Next, apply the same acrylic adhesive to the surface of the liquid crystal polymer layer, bond it to the PET film, and cure it.
  • PET polyethylene terephthalate
  • PET film (separable substrate) Z-cured acrylic adhesive layer (translucent overcoat) (Coating layer) Z liquid crystal polymer layer No-cured ataryl adhesive layer (light-transmitting overcoat layer) A laminated film A composed of a ZPET film (separable substrate) was obtained.
  • a polarizing plate made by laminating 80 m thick cellulose triacetate (TAC) film with an acrylic adhesive on both sides of a polarizing element in which iodine is adsorbed to stretched polyvinyl alcohol. And the above laminated film A were continuously laminated via an acryl-based adhesive while continuously peeling the PET film on one side thereof, thereby producing an elliptically polarizing plate G.
  • the total thickness of this elliptically polarizing plate is about 200 m: o
  • the PET film on the liquid crystal polymer layer side was peeled off from the elliptically polarizing plate G, and attached to a glass plate via an acryl-based adhesive to form a test piece.
  • the test pieces were placed in a constant temperature oven at 80 ° C dry and a constant temperature / humidity oven at 60 ° C 90% RH.Each 500 hours later, they were removed and observed.No abnormality such as peeling or foaming was observed under both conditions. The power that has come.
  • a long PPS film having a width of 65 Omm and a thickness of 80 ⁇ m was subjected to rubbing treatment in the same manner as in Example 5 to obtain an oriented substrate film having a rubbing angle of 45 °.
  • the solution prepared in Preparation Example 2 of the liquid crystal polymer solution was applied to the above-mentioned alignment substrate film, dried and then subjected to a heating alignment treatment to fix the alignment of the liquid crystal polymer layer.
  • This liquid crystal polymer layer was in a nematic orientation, and had an And of 0.
  • a laminated film B was produced in the same manner as in Example 5, and an elliptically polarizing plate H was produced.
  • the total film thickness of this elliptically polarizing plate was about 200 m.
  • test piece was attached to a glass plate via an adhesive.
  • the test pieces were placed in a constant temperature oven at 80 ° C dry and a constant temperature / humidity oven at 60 ° C 90% RH.Each 500 hours later, they were taken out and observed.In both conditions, abnormalities such as peeling and foaming were observed. The power that was not recognized at all.
  • the PET film on the liquid crystal polymer layer side was peeled off from the elliptically polarizing plate I, and affixed to a glass plate via an acryl-based adhesive to form a test piece.
  • the test specimens were placed in a constant temperature oven at 80 ° C dry and a constant temperature / humidity oven at 60 ° C 90% RH.After 500 hours, they were taken out and observed.In both conditions, abnormalities such as peeling and bubbles were observed. Was not recognized at all.
  • a liquid crystal display device was manufactured using the elliptically polarizing plate I.
  • the elliptically polarizing plate I was arranged so that the liquid crystal polymer layer side was close to the driving liquid crystal cell, and was arranged such that the rubbing direction of the liquid crystal polymer layer and the orientation angle of the liquid crystal adjacent to the liquid HB cell were 90 °. .
  • the driving liquid crystal cell used ZL 1-4792 as a liquid crystal material, and the cell parameters were a cell gap of 4.8 / m, a twist angle of 90 ° (left twist), and a pretilt angle of 4 °. The viewing angle characteristics of this liquid crystal display were wider than those without the liquid crystal polymer layer. Comparative Example 4 (Preparation of elliptically polarizing plate K):
  • a UV curable acrylic adhesive was applied to the liquid crystal polymer layer formed on the film obtained in Example 5 in accordance with Example 5 according to Example 5, and the thickness of the film was not reduced to 80 m. It was cured after bonding with a TAC film. Next, the PEEK film was peeled off, and the liquid crystal polymer layer was transferred onto the TAC film. Apply the same acrylic adhesive to the liquid crystal polymer layer side to protect the surface, and bond it to the PET film to form a PE TZ cured acrylic adhesive layer Z liquid crystal polymer layer Z cured acrylic adhesive layer AC A film was obtained.
  • An elliptically polarizing plate K was produced by continuously laminating the PET film from the laminated film to the polarizing plate of Example 5 via an acrylic adhesive while continuously removing the PET film.
  • the total film thickness of this elliptically polarizing plate was as thick as about 300 ⁇ m.
  • Example 5 Without forming a surface protective layer on the liquid crystal polymer layer transferred on the PET film obtained in Example 5, the polarizer of Example 5 was continuously bonded to the polarizing plate via an acryl-based adhesive to form an ellipse. A polarizing plate L was produced. When an optical inspection was performed on the elliptically polarizing plate L, many spots and scratches were considered to be caused by damage to the liquid crystal polymer layer. An acryl-based adhesive was applied to the liquid crystal polymer layer side of the elliptical polarizing plate L and attached to a glass plate to obtain a test piece. When the same test as in Examples 5 and 6 was performed, fine pieces, wrinkles and cracks were recognized on the test piece under dry conditions at 800 after elapse of 500 hours.
  • the elliptically polarizing plate of the present invention has a small total number of laminating layers constituting the elliptically polarizing plate and thus has a small total film thickness. Room can be processed. Furthermore, since the layer structure is simplified, there is an advantage that no peeling or bubbles are generated at the interface in the accelerated durability test. In the laminating process, it can be laminated in the form of a long film. The bonding process can be streamlined compared to the conventional method, and there is no damage to the liquid crystal polymer layer.

Landscapes

  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Polarising Elements (AREA)
  • Liquid Crystal (AREA)

Abstract

On décrit une plaque polarisante elliptique comprenant une couche polymère de cristaux liquides et un élément polarisant, cette plaque polarisante elliptique étant formée au moyen d'un procédé de production comprenant les étapes suivantes : on forme la couche polymère de cristaux liquides sur un film en triacétate de cellulose, on forme une couche de protection translucide sur la couche polymère de cristaux liquides, on effectue une saponification pour fabriquer un élément anisotrope optique et on colle un film polarisant sur l'élément anisotrope optique avec une couche d'adhésif de manière à intercaler le film polarisant entre l'élément anisotrope optique et un film protecteur translucide ou au moyen d'un procédé qui consiste à coller un élément polarisant sur la couche polymère de cristaux liquides formée sur un substrat séparable en même temps qu'une couche d'adhésif collant.
PCT/JP2000/009097 1999-12-22 2000-12-21 Plaque polarisante elliptique, procede de production de cette plaque polarisante et affichage a cristaux liquides comprenant cette derniere WO2001046720A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP36537899A JP2001183525A (ja) 1999-12-22 1999-12-22 楕円偏光板の製造方法
JP11/365379 1999-12-22
JP36537999A JP2001183526A (ja) 1999-12-22 1999-12-22 楕円偏光板とその製造方法及びそれを用いた液晶表示装置
JP11/365378 1999-12-22

Publications (2)

Publication Number Publication Date
WO2001046720A1 true WO2001046720A1 (fr) 2001-06-28
WO2001046720A8 WO2001046720A8 (fr) 2002-08-08

Family

ID=26581657

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2000/009097 WO2001046720A1 (fr) 1999-12-22 2000-12-21 Plaque polarisante elliptique, procede de production de cette plaque polarisante et affichage a cristaux liquides comprenant cette derniere

Country Status (2)

Country Link
TW (1) TW556024B (fr)
WO (1) WO2001046720A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6970214B2 (en) 2001-09-04 2005-11-29 Nippon Oil Corporation Elliptical polarizer and liquid crystal display device
US8134659B2 (en) 2008-06-13 2012-03-13 Jx Nippon Oil & Energy Corporation Elliptical polarizer and vertical alignment type liquid crystal display device using the same
US8179501B2 (en) 2007-08-31 2012-05-15 Nippon Oil Corporation Liquid crystal display device having an elliptical polarizer with first and second anisotropic layers
US8203673B2 (en) 2006-11-17 2012-06-19 Nippon Oil Corporation Elliptical polarizer and vertical alignment type liquid crystal display device comprising the same

Citations (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06242434A (ja) * 1993-02-12 1994-09-02 Nippon Petrochem Co Ltd 光学素子
EP0644439A1 (fr) * 1993-02-12 1995-03-22 Nippon Petrochemicals Co., Ltd. Film polymere a cristaux liquides, feuille stratifiee pour element optique utilisant ce film, et element optique comportant cette feuille
JP3009020U (ja) * 1994-09-14 1995-03-28 日本合成化学工業株式会社 積層構造体
JPH08271733A (ja) * 1995-04-03 1996-10-18 Fujimori Kogyo Kk 前面側偏光板の前面側保護シート、その製造法、および該前面側保護シートの偏光素膜側への貼着方法
JPH08300543A (ja) * 1995-05-09 1996-11-19 Nippon Synthetic Chem Ind Co Ltd:The 積層構造体
JPH0943431A (ja) * 1995-07-28 1997-02-14 Nippon Synthetic Chem Ind Co Ltd:The 位相差フィルム及びその用途
JPH09178937A (ja) * 1995-12-25 1997-07-11 Nippon Oil Co Ltd 液晶表示素子用補償板の製造方法
JPH09178941A (ja) * 1995-12-27 1997-07-11 Sekisui Chem Co Ltd 楕円偏光板の製造方法
JPH09258021A (ja) * 1996-03-25 1997-10-03 Nitto Denko Corp 楕円偏光板
JPH09288213A (ja) * 1996-04-19 1997-11-04 Nippon Synthetic Chem Ind Co Ltd:The 楕円偏光板
JPH09329785A (ja) * 1996-06-10 1997-12-22 Fuji Photo Film Co Ltd 液晶表示素子
JPH10197722A (ja) * 1996-12-27 1998-07-31 Nitto Denko Corp 偏光反射素子、楕円偏光素子及び液晶表示装置
US5795650A (en) * 1995-09-27 1998-08-18 Lintec Corporation Pressure-sensitive adhesive sheet
EP0926533A2 (fr) * 1997-12-25 1999-06-30 Fuji Photo Film Co., Ltd. Feuille de compensation optique et afficheur à cristaux liquides comprenant la feuille
JPH11271531A (ja) * 1998-03-23 1999-10-08 Sekisui Chem Co Ltd 楕円偏光板の製造方法
JP2000155214A (ja) * 1998-11-19 2000-06-06 Nitto Denko Corp 広視野角偏光板及び液晶表示装置
JP2000258631A (ja) * 1999-03-10 2000-09-22 Nitto Denko Corp 広視野角偏光板及び液晶表示装置
JP2000258632A (ja) * 1999-03-10 2000-09-22 Nitto Denko Corp 広視野角偏光板及び液晶表示装置
JP2001031924A (ja) * 1999-07-19 2001-02-06 Nitto Denko Corp 表面保護フィルム
JP2001042127A (ja) * 1999-08-04 2001-02-16 Nitto Denko Corp 複合位相差板、光学補償偏光板及び液晶表示装置
JP2001042128A (ja) * 1999-08-04 2001-02-16 Nitto Denko Corp 複合位相差板、光学補償偏光板及び液晶表示装置

Patent Citations (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0644439A1 (fr) * 1993-02-12 1995-03-22 Nippon Petrochemicals Co., Ltd. Film polymere a cristaux liquides, feuille stratifiee pour element optique utilisant ce film, et element optique comportant cette feuille
JPH06242434A (ja) * 1993-02-12 1994-09-02 Nippon Petrochem Co Ltd 光学素子
JP3009020U (ja) * 1994-09-14 1995-03-28 日本合成化学工業株式会社 積層構造体
JPH08271733A (ja) * 1995-04-03 1996-10-18 Fujimori Kogyo Kk 前面側偏光板の前面側保護シート、その製造法、および該前面側保護シートの偏光素膜側への貼着方法
JPH08300543A (ja) * 1995-05-09 1996-11-19 Nippon Synthetic Chem Ind Co Ltd:The 積層構造体
JPH0943431A (ja) * 1995-07-28 1997-02-14 Nippon Synthetic Chem Ind Co Ltd:The 位相差フィルム及びその用途
US5795650A (en) * 1995-09-27 1998-08-18 Lintec Corporation Pressure-sensitive adhesive sheet
JPH09178937A (ja) * 1995-12-25 1997-07-11 Nippon Oil Co Ltd 液晶表示素子用補償板の製造方法
JPH09178941A (ja) * 1995-12-27 1997-07-11 Sekisui Chem Co Ltd 楕円偏光板の製造方法
JPH09258021A (ja) * 1996-03-25 1997-10-03 Nitto Denko Corp 楕円偏光板
JPH09288213A (ja) * 1996-04-19 1997-11-04 Nippon Synthetic Chem Ind Co Ltd:The 楕円偏光板
JPH09329785A (ja) * 1996-06-10 1997-12-22 Fuji Photo Film Co Ltd 液晶表示素子
JPH10197722A (ja) * 1996-12-27 1998-07-31 Nitto Denko Corp 偏光反射素子、楕円偏光素子及び液晶表示装置
EP0926533A2 (fr) * 1997-12-25 1999-06-30 Fuji Photo Film Co., Ltd. Feuille de compensation optique et afficheur à cristaux liquides comprenant la feuille
JPH11271531A (ja) * 1998-03-23 1999-10-08 Sekisui Chem Co Ltd 楕円偏光板の製造方法
JP2000155214A (ja) * 1998-11-19 2000-06-06 Nitto Denko Corp 広視野角偏光板及び液晶表示装置
JP2000258631A (ja) * 1999-03-10 2000-09-22 Nitto Denko Corp 広視野角偏光板及び液晶表示装置
JP2000258632A (ja) * 1999-03-10 2000-09-22 Nitto Denko Corp 広視野角偏光板及び液晶表示装置
JP2001031924A (ja) * 1999-07-19 2001-02-06 Nitto Denko Corp 表面保護フィルム
JP2001042127A (ja) * 1999-08-04 2001-02-16 Nitto Denko Corp 複合位相差板、光学補償偏光板及び液晶表示装置
JP2001042128A (ja) * 1999-08-04 2001-02-16 Nitto Denko Corp 複合位相差板、光学補償偏光板及び液晶表示装置

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6970214B2 (en) 2001-09-04 2005-11-29 Nippon Oil Corporation Elliptical polarizer and liquid crystal display device
US8203673B2 (en) 2006-11-17 2012-06-19 Nippon Oil Corporation Elliptical polarizer and vertical alignment type liquid crystal display device comprising the same
US8179501B2 (en) 2007-08-31 2012-05-15 Nippon Oil Corporation Liquid crystal display device having an elliptical polarizer with first and second anisotropic layers
US8134659B2 (en) 2008-06-13 2012-03-13 Jx Nippon Oil & Energy Corporation Elliptical polarizer and vertical alignment type liquid crystal display device using the same

Also Published As

Publication number Publication date
TW556024B (en) 2003-10-01
WO2001046720A8 (fr) 2002-08-08

Similar Documents

Publication Publication Date Title
JP5072747B2 (ja) 偏光子の製造方法、偏光子、偏光板、光学フィルムおよび画像表示装置
US7738064B2 (en) Retardation plate and its manufacturing method, circularly polarizing plate and 1/2 wave plate using same, and a reflective liquid crystal display
JP4107741B2 (ja) 光学フィルムの製造法、光学フィルム及び液晶表示装置
WO2015111474A1 (fr) Plaque de polarisation et dispositif d'affichage à cristaux liquides
US20140099452A1 (en) Peelable laminated film, peelable laminated film roll, manufacturing method thereof, film, optical film, polarizing plate, manufacturing method of polarizing plate and liquid crystal display device
WO2004090591A1 (fr) Procede de production d'un lamine optique comprenant le lamine optique, une plaque a polarisation elliptique, une plaque a polarisation circulaire et une unite d'affichage a cristaux liquides, et lamine optique correspondant
JP7405165B2 (ja) 液晶パネルの製造方法、偏光板及び液晶表示装置
WO2015152157A1 (fr) Plaque de polarisation, dispositif d'affichage d'image et dispositif d'affichage à cristaux liquides
TW202033632A (zh) 液晶化合物配向層轉印用配向薄膜
KR20040031037A (ko) 타원 편광판 및 액정 표시장치
KR20080071503A (ko) 액정 필름의 제조방법 및 광학소자용 적층 필름
JP2002365428A (ja) 光学フィルムの製造方法及びそれを用いた積層偏光板、液晶表示装置
JP3328702B2 (ja) 光学素子
WO2001046720A1 (fr) Plaque polarisante elliptique, procede de production de cette plaque polarisante et affichage a cristaux liquides comprenant cette derniere
KR20240019846A (ko) 위상차 필름 및 그의 제조 방법, 편광판, 및 액정 표시 장치
WO2021014685A1 (fr) Procédé de production de plaque de polarisation circulaire mince
WO2004090592A1 (fr) Procede de fabrication de plastifie optique, y compris le plastifie optique, une plaque de polarisation verticale, une plaque de polarisation circulaire et une unite d'affichage a cristaux optiques
JP2001183526A (ja) 楕円偏光板とその製造方法及びそれを用いた液晶表示装置
KR100955747B1 (ko) 액정 필름 및 타원 편광판의 제조방법
JP2001183525A (ja) 楕円偏光板の製造方法
WO2022181188A1 (fr) Stratifié et procédé de fabrication d'écran d'affichage d'image
WO2022244301A1 (fr) Plaque de polarisation circulaire et dispositif d'affichage d'image l'utilisant
CN113454701B (zh) 图像显示装置及其制造方法
KR100671402B1 (ko) 네마틱 액정 코팅을 이용한 네가티브 보상필름 및 이를포함하는 광학 필름의 제조방법
TW202212090A (zh) 光學膜之製造方法

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): KR US

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LU MC NL PT SE TR

121 Ep: the epo has been informed by wipo that ep was designated in this application
DFPE Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101)
AK Designated states

Kind code of ref document: C1

Designated state(s): KR US

AL Designated countries for regional patents

Kind code of ref document: C1

Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LU MC NL PT SE TR

WRT Later publication of a revised version of an international search report translation
122 Ep: pct application non-entry in european phase