WO2005031406A1 - 光学フィルムおよび画像表示装置 - Google Patents
光学フィルムおよび画像表示装置 Download PDFInfo
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- WO2005031406A1 WO2005031406A1 PCT/JP2004/013323 JP2004013323W WO2005031406A1 WO 2005031406 A1 WO2005031406 A1 WO 2005031406A1 JP 2004013323 W JP2004013323 W JP 2004013323W WO 2005031406 A1 WO2005031406 A1 WO 2005031406A1
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- Prior art keywords
- film
- retardation
- liquid crystal
- polarizing plate
- axis
- Prior art date
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Classifications
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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
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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
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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
- G02B5/3041—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 comprising multiple thin layers, e.g. multilayer stacks
- G02B5/305—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 comprising multiple thin layers, e.g. multilayer stacks including organic materials, e.g. polymeric layers
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- 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 film in which a polarizing plate and a plurality of retardation films are laminated.
- the present invention also relates to an image display device such as a liquid crystal display device, a PDP, a CRT or the like using the optical film.
- the optical film of the present invention is suitable for a liquid crystal display device operating in a so-called IPS mode.
- a so-called TN mode liquid crystal display device in which liquid crystals having a positive dielectric anisotropy are twisted horizontally between substrates facing each other has been mainly used.
- liquid crystal molecules near the substrate caused birefringence due to the driving characteristics of the TN mode, resulting in light leakage, making it difficult to perform perfect black display.
- the liquid crystal molecules in the IPS mode liquid crystal display device in the non-driving state, the liquid crystal molecules have a homogenous orientation substantially parallel to the substrate surface, so that light passes through the liquid crystal layer and its polarization plane. By passing the light with almost no change, and by arranging the polarizers above and below the substrate, almost complete black display is possible in the non-driving state.
- a polarizing plate is used in which a geometrical axis shift of the polarizing plate, which occurs when observed from an oblique direction, is compensated by a retardation film.
- polarizing plate is disclosed such (e.g., Patent Document 1, Patent Document 2.) 0 teeth
- Patent Document 1 Patent Document 2.
- Ru sufficient wide viewing angle in the retardation film Difficult to achieve ⁇ .
- a retardation film is used as a protective film of the polarizer.
- the polarizing plate can provide good viewing angle characteristics in a normal use environment, it is directly affected by the dimensional change of the polarizer at high temperature and high humidity.
- the laminated protective film also deforms. Therefore, if the retardation value of the retardation film used for the protective film deviates from a desired value, the effect cannot be stably maintained! / ⁇ , there was a problem.
- Patent Document 2 a retardation film is laminated on a polarizing plate using a triacetyl cellulose film (TAC film) generally used as a protective film! ⁇
- TAC film triacetyl cellulose film
- the retardation value of the retardation film is stable.
- there is a retardation value that cannot be ignored in the TAC film and it is difficult to design a retardation film that compensates for the axis deviation.
- a change in the retardation value of the TAC film occurs due to a dimensional change of the polarizer at high temperature or high humidity, and the desired purpose cannot be achieved.
- Patent document 1 Japanese Patent Application Laid-Open No. 4 305602
- Patent Document 2 JP-A-4371903
- the present invention is an optical film in which a polarizing plate and a retardation film are laminated, and when applied to an image display device, is capable of realizing an easy-to-read display having a high contrast ratio over a wide range and a high temperature. It is an object of the present invention to provide an optical film capable of securing a stable retardation value even under low temperature or high humidity.
- the present invention also provides an image display device using the optical film and having a high contrast ratio over a wide range and having a high contrast ratio, and capable of realizing display, particularly a liquid crystal display device operating in the IPS mode. Aim.
- the present inventors have conducted intensive studies to solve the above problems, and as a result, have found the following optical films, and have completed the present invention.
- the present invention provides a polarizing plate comprising a polarizer and a transparent protective film laminated on both sides, a plurality of retardation films on one surface, and an absorption axis of the polarizing plate and each retardation film of the plurality of retardation films.
- a polarizing plate comprising a polarizer and a transparent protective film laminated on both sides, a plurality of retardation films on one surface, and an absorption axis of the polarizing plate and each retardation film of the plurality of retardation films.
- the direction of the in-plane refractive index in the film plane is the X axis
- the direction perpendicular to the X axis is the Y axis
- the thickness direction of the film is the Z axis.
- Nz (nx nz) / (nx ny) Nz value force expressed as 0.15-0.85 is satisfied, and
- An optical film characterized in that at least one transparent protective film contains a thermoplastic saturated norbornene-based resin.
- the IPS mode liquid crystal display device has a function of compensating for a decrease in contrast in the oblique direction of the liquid crystal layer. Further, since a plurality of retardation films are laminated, the contrast is high and the color shift can be suppressed to be small. Multiple phase difference files
- the Nz value force is 0.15 to 0.85, and the in-plane in-plane difference in force is 200 to 350 nm.
- the Nz value is preferably a point force in the above-mentioned range that enhances the compensation function for contrast.
- the following embodiment is preferable when two retardation films are used as the plurality of retardation films.
- the retardation film (a) satisfies the Nz value of 0.65-0.85 and the retardation film (b) has the Nz value of 0.15-0.15. It is preferable to satisfy 0.35.
- the retardation film (a) satisfies the Nz value of 0.65-0.85, and the retardation film (b) has the Nz value of 0.15. It is preferable to satisfy -0.35.
- the Nz value of the retardation film (a) is more preferably 0.7 to 0.8, more preferably 0.72 to 0.78.
- the Nz value of the retardation film (b) is more preferably 0.2-0.3, further preferably 0.22-0.28.
- the absolute value of the difference between the Nz value of the film (a) and the Nz value of the retardation film (b) is preferably set to 0.4 to 0.6.
- the absolute value of the difference between the Nz values is more preferably 0.45 to 0.55 force, and more preferably 0.48 to 0.52 force S.
- the in-plane retardation Re is 230 nm or more in order to enhance the compensation function for contrast.
- the in-plane retardation Re is less than 300 nm
- Each thickness d of multiple retardation films is particularly limited.
- the power is usually about 40 to 100 m, preferably 50 to 70 m.
- the transparent protective film on at least one side of the polarizing plate contains a thermoplastic saturated norbornene-based resin.
- Thermoplastic saturated norbornene resins have excellent heat resistance, moisture resistance, and weather resistance.
- the transparent film which is the main component of the resin, changes the dimensions of the polarizer at high temperatures and high humidity, and the In this case, a stable phase difference value can be secured. That is, it is possible to obtain an optical film with little change in characteristics that is less likely to cause a phase difference even in an environment of high temperature and high humidity.
- At least one side of the transparent protective film has an X-axis in a direction in which the in-plane refractive index in the film surface is maximum, a Y-axis in a direction perpendicular to the X-axis, and a thickness direction in the film.
- the refractive index in the axial direction is nx, ny, nz, and the film thickness d (nm
- the in-plane retardation of the transparent protective film is 20 nm or less, more preferably lOnm or less, and the thickness direction retardation is 30 nm or less, more preferably 20 nm or less.
- the thickness d of the transparent protective film is not particularly limited, but is generally 500
- / z m or less and 1-300 m force S is preferred. In particular, it is preferably 5 to 200 m.
- the present invention relates to an image display device characterized by using the optical film.
- the image display device is an IPS mode liquid crystal display device, wherein the optical film is disposed on a cell substrate on a viewing side,
- a polarizing plate consisting of a transparent protective film laminated on both sides of the polarizer is arranged, and when no voltage is applied, the liquid crystal in the liquid crystal cell is abnormal.
- the present invention relates to a liquid crystal display device characterized in that a light refractive index direction and an absorption axis of the polarizing plate are in a parallel state.
- the image display device is an IPS mode liquid crystal display device
- a polarizing plate formed by laminating a transparent protective film on both sides of a polarizer is arranged on the cell substrate on the viewing side,
- the optical film is disposed on the cell substrate on the side opposite to the viewing side, and the direction of the extraordinary light refractive index of the liquid crystal material in the liquid crystal cell and the absorption axis of the optical film in a state where no voltage is applied.
- the present invention relates to a liquid crystal display device which is in an orthogonal state.
- the transparent protective film on at least one surface of the polarizing plate contains a thermoplastic saturated norbornene resin.
- At least one side of the transparent protective film has an X-axis in a direction in which the in-plane refractive index in the film surface is maximum, a Y-axis in a direction perpendicular to the X-axis, The thickness direction is the Z axis, and the refractive indices in each axis direction are nx, ny, nz,
- an IPS mode liquid crystal display device is preferable.
- an optical film in which the polarizing plate of the present invention and a plurality of retardation films having a specific retardation value are laminated on one surface of an IPS mode liquid crystal cell By disposing an optical film in which the polarizing plate of the present invention and a plurality of retardation films having a specific retardation value are laminated on one surface of an IPS mode liquid crystal cell, an IPS mode liquid crystal display device and The light leakage at the time of black display can be reduced.
- Such an IPS mode liquid crystal display device has a high contrast ratio in all directions and can realize a display that is easy to see at a wide viewing angle. Also, the color shift can be kept small.
- thermoplastic saturated norbornene-based resin as a main component when used as the transparent protective film of the polarizing plate disposed on the liquid crystal cell surface, a wide viewing angle is obtained. This is suitable for obtaining a liquid crystal display device that can secure a stable phase difference.
- FIG. 1 (A) is an example of a cross-sectional view of the optical film of the present invention.
- FIG. 1 (B) is an example of a cross-sectional view of the optical film of the present invention.
- FIG. 2 is an example of a conceptual diagram of a liquid crystal display device of the present invention.
- FIG. 3 is an example of a conceptual diagram of a liquid crystal display device of the present invention.
- FIG. 4 is a view showing a color shift of Example 1.
- FIG. 5 is a view showing a color shift in Example 2.
- FIG. 6 is a diagram showing a color shift of a third embodiment.
- FIG. 7 is a view showing a color shift in Example 4.
- FIG. 8 is a view showing a color shift of Comparative Example 1.
- FIG. 9 is a view showing a color shift of Comparative Example 2.
- the optical film of the present invention has a polarizing plate and a plurality of retardation films.
- FIGS. 1A and 1B show an example in which two retardation films 2 are laminated from the polarizing plate 1 side.
- the polarizing plate 1 has a transparent protective film lb laminated on both surfaces of the polarizer la.
- FIG. 1A two retardation films 2a and 2b are arranged in this order on one side of the polarizing plate 1. This is an example in the case where the layers are stacked.
- FIG. 1A two retardation films 2a and 2b are arranged in this order on one side of the polarizing plate 1. This is an example in the case where the layers are stacked.
- FIG. 1A shows an example in which two retardation films 2b and 2a are laminated on one surface of the polarizing plate 1 in this order.
- the absorption axis of the polarizing plate 1 and the slow axis of the retardation film 2 (b, a) are laminated so as to be orthogonal. It is preferable that the absorption axis of the polarizing plate 1 and the slow axis of the retardation film 2 are laminated in parallel to the point force in the continuous laminating step at the time of lamination.
- the retardation films 2a and 2b those having an Nz value of 0.15 to 0.85 and an in-plane retardation Re force ⁇ OO—350 nm
- retardation film 2a whose Nz value satisfies 0.65-0.85
- retardation film 2b whose Nz value satisfies 0.15-0.35 Is preferred.
- the retardation film a film satisfying the Nz value and the in-plane retardation Re value is particularly preferable.
- a birefringent film of a polymer film, an alignment film of a liquid crystal polymer, and the like can be given.
- high-molecular polymer examples include polyolefins such as polycarbonate and polypropylene, polyesters such as polyethylene terephthalate and polyethylene naphthalate, alicyclic polyolefins such as polynorbornene, polybutyl alcohol, polybutyl butyral, and polymethyl vinyl ether.
- the retardation film controls the refractive index in the thickness direction by a method of stretching the polymer film biaxially in the plane direction, a method of uniaxially or biaxially stretching in the plane direction, and a method of stretching also in the thickness direction. It can be obtained by: Further, it can be obtained by a method in which a heat-shrinkable film is adhered to a polymer film, and the polymer film is stretched or Z- and shrunk under the action of the shrinkage force by heating to be tilted.
- liquid crystal polymer for example, a conjugated linear atomic group imparting liquid crystal orientation is used.
- main chain and side chain in which (mesogen) is introduced into the main chain and side chain of polymer Is raised.
- the main chain type liquid crystal polymer include a structure in which a mesogen group is bonded at a spacer portion that imparts flexibility, for example, a nematic alignment polyester liquid crystal polymer, a discotic polymer, and a cholesteric polymer. can give.
- the side-chain type liquid crystalline polymer include polysiloxane, polyatalylate, polymethacrylate or polymalonate having a main chain skeleton, and a nematic alignment imparted through a spacer portion comprising a conjugated atomic group as a side chain.
- the alignment film of these liquid crystalline polymers is, for example, formed by rubbing the surface of a thin film of polyimide or polyvinyl alcohol formed on a glass plate, or by subjecting a thin film of silicon oxide to oblique vapor deposition. It is preferable that the liquid crystal polymer is oriented by developing a solution of the liquid crystalline polymer and then subjected to heat treatment, particularly, the liquid crystal polymer is inclined and oriented.
- the polarizer is not particularly limited, and various types can be used.
- the polarizer include a hydrophilic polymer film such as a polyvinyl alcohol-based film, a partially formalized polyvinyl alcohol-based film, and an ethylene / butyl acetate copolymer-based partially modified film, and iodine and a dichroic dye.
- polyene-based oriented films such as dehydrated polyvinyl alcohol and dehydrochlorinated polyvinyl chloride.
- a polybutyl alcohol-based film and a polarizer having a dichroic substance such as iodine are preferable.
- the thickness of these polarizers is not particularly limited. Generally, the thickness is about 5 to 80 m.
- a polarizer obtained by dyeing a polyvinyl alcohol-based film with iodine and uniaxially stretching is produced by, for example, dyeing polyvinyl alcohol by immersing it in an aqueous solution of iodine and stretching it to 3 to 7 times its original length.
- iodine an aqueous solution of iodine and stretching it to 3 to 7 times its original length.
- it can be immersed in an aqueous solution of potassium iodide or the like which may contain boric acid, zinc sulfate, zinc chloride, or the like.
- the polyvinyl alcohol-based film may be immersed in water and washed with water before dyeing.
- Stretching may be performed after dyeing with iodine, may be performed while dyeing, or It may be stretched and dyed with iodine. Stretching can be performed in an aqueous solution of boric acid or potassium iodide or in a water bath.
- thermoplastic saturated norbornene resin As a material for forming the transparent protective films provided on both surfaces of the polarizer, a thermoplastic saturated norbornene resin is used. As described above, a transparent protective film containing a strong thermoplastic saturated norbornene-based resin hardly causes a phase difference even when subjected to stress due to a dimensional change of a polarizer.
- thermoplastic saturated norbornene-based resin has cycloolefin as a main skeleton and has substantially no carbon-carbon double bond.
- thermoplastic saturated norbornene-based resin examples include ZONEX and ZEONOR manufactured by ZEON CORPORATION, and ARTON manufactured by JSR Corporation.
- a film containing the thermoplastic saturated norbornene resin can be used as the transparent protective film used on at least one side of the polarizer.
- the transparent protective film using the thermoplastic saturated norbornene resin can be used by being laminated on both surfaces of a polarizer, and a transparent protective film containing the thermoplastic saturated norbornene resin on one surface of the polarizer.
- a transparent protective film made of a material other than the above can be used on one side of the other polarizer.
- a transparent protective film containing the thermoplastic saturated norbornene-based resin is used on one surface of a polarizer, and a transparent protective film of a material other than the above is used on one surface of the other polarizer.
- a retardation film is laminated on the transparent protective film side containing the thermoplastic resin having the thermoplastic saturated norbornene resin.
- polyester polymers such as polyethylene terephthalate and polyethylene naphthalate
- cellulose polymers such as diacetylinoresole cellulose
- acrylic polymers such as polymethyl methacrylate, polystyrene and acrylonitrile styrene Styrene-based polymers such as copolymers (AS resin), polycarbonate-based polymers, and the like.
- Polyolefins such as polyethylene and polypropylene, and polyols such as ethylene-propylene copolymer Fin-based polymers, butyl-based polymers, amide polymers such as nylon and aromatic polyamides, imide-based polymers, snolephone-based polymers, polyetherenoles-noreon-based polymers, polyetheretherketone-based polymers, polyphenylenesulfide-based polymers, A vinylinoleanol-based polymer, a bilidene chloride-based polymer, a bulptylal-based polymer, an arylate-based polymer, a polyoxymethylene-based polymer, an epoxy-based polymer, or a blend of the above polymers also forms the transparent protective film. Examples are polymers.
- the transparent protective film can also be formed as a cured layer of a thermosetting resin or an ultraviolet curable resin such as an acrylic, urethane, acrylic urethane, epoxy or silicone resin.
- the surface of the transparent protective film on which the polarizer is not adhered may be subjected to a hard coat layer, an antireflection treatment, a treatment for preventing sticking, or a treatment for diffusion or antiglare.
- the hard coat treatment is performed for the purpose of preventing the surface of the polarizing plate from being scratched.
- a suitable UV-curable resin such as an acrylic or silicone resin is used to cure the film with excellent hardness and sliding properties.
- the film can be formed by a method of adding a film to the surface of the transparent protective film.
- the anti-reflection treatment is performed for the purpose of preventing reflection of external light on the polarizing plate surface, and can be achieved by forming an anti-reflection film or the like according to the related art.
- the anti-sticking treatment is performed for the purpose of preventing adhesion to the adjacent layer.
- the anti-glare treatment is performed for the purpose of preventing external light from being reflected on the surface of the polarizing plate and hindering the visibility of the light transmitted through the polarizing plate.
- the transparent protective film can be formed by imparting a fine uneven structure to the surface of the transparent protective film by an appropriate method such as a surface roughening method or a method of blending transparent fine particles.
- Examples of the fine particles to be contained in the formation of the surface fine uneven structure include silica, alumina, titania, zirco-a, tin oxide, indium oxide, cadmium oxide, and acid oxide having an average particle size of 0.5 to 50 ⁇ m.
- Transparent fine particles such as inorganic fine particles which may be conductive, such as antimony, and organic fine particles, such as a crosslinked or uncrosslinked polymer, which are strong.
- the amount of fine particles used is generally about 2 to 50 parts by weight, preferably 5 to 25 parts by weight, per 100 parts by weight of the transparent resin forming the fine surface uneven structure.
- the anti-glare layer may also serve as a diffusion layer (viewing angle expanding function, etc.) for expanding the viewing angle by diffusing the light transmitted through the polarizing plate.
- the anti-reflection layer, anti-staking layer, diffusion layer, anti-glare layer, and the like can be provided on the transparent protective film itself, or can be separately provided as an optical layer separately from the transparent protective film. It can also be provided.
- the bonding treatment between the polarizer and the transparent protective film includes an isocyanate-based adhesive and a polyvinyl chloride.
- the method for laminating the retardation film and the polarizing plate is not particularly limited, and the lamination can be performed with an adhesive layer or the like.
- the pressure-sensitive adhesive for forming the pressure-sensitive adhesive layer is not particularly limited, and for example, an adhesive containing a polymer such as an acrylic polymer, a silicone-based polymer, a polyester, a polyurethane, a polyamide, a polyether, a fluorine-based or a rubber-based polymer as appropriate. It can be used selectively.
- an acrylic adhesive having excellent optical transparency, exhibiting appropriate wettability, cohesiveness and adhesive adhesive properties and having excellent weather resistance and heat resistance is preferably used.
- Each layer such as an optical film and a pressure-sensitive adhesive layer is treated with an ultraviolet absorbent such as a salicylate compound, a benzophenol compound, a benzotriazole compound, a cyanoacrylate compound, and a nickel complex compound. It may be one having a function of absorbing ultraviolet rays by a method such as a method.
- An IPS mode liquid crystal display device includes a pair of substrates sandwiching a liquid crystal layer, an electrode group formed on one of the pair of substrates, and a liquid crystal composition having a dielectric anisotropy sandwiched between the substrates.
- the electrode group has an arrangement structure such that a parallel electric field is mainly applied to an interface between the alignment control layer and the liquid crystal composition material layer.
- the optical film 3 of the present invention is Placed on the side. 2 and 3 show the case where the optical film 3 exemplified in FIG. 1 (A) is used.
- the optical film 3 preferably has the retardation film 2 side as the liquid crystal cell 4 side.
- a polarizing plate 1 is disposed on the opposite side of the liquid crystal cell 4 on which the optical film 3 is disposed.
- the absorption axis of the polarizing plate 1 arranged on both sides of the substrate of the liquid crystal cell 4 and the absorption axis of the optical film 3 (the polarizing plate 1) are arranged orthogonal to each other.
- a polarizing plate la similar to that used for the optical film 3 and a transparent protective film 2b laminated on both surfaces is used.
- the substrate of the liquid crystal cell 4 on the side opposite to the viewing side includes: It is preferable that the polarizing plate 1 is arranged so that the direction of the extraordinary refractive index of the liquid crystal material in the liquid crystal cell 4 and the absorption axis of the polarizing plate 1 are in a parallel state in a state where no voltage is applied.
- the polarizing plate 1 is arranged on the substrate of the liquid crystal cell 4 on the viewing side, and no voltage is applied. It is preferable to arrange the liquid crystal cell 4 so that the direction of the extraordinary refractive index of the liquid crystal substance in the liquid crystal cell 4 and the absorption axis of the optical film 3 (polarizing plate 1) are perpendicular to each other in the added state.
- the optical film and the polarizing plate can be used by laminating other optical layers in practical use.
- the optical layer is not particularly limited.
- an optical layer which may be used for forming a liquid crystal display device such as a reflection plate, a semi-transmission plate, and a retardation plate (including a wavelength plate such as 1Z2 or 1Z4) is used.
- One or more layers can be used.
- a reflective polarizing plate or a transflective polarizing plate in which a reflecting plate or a transflective reflecting plate is further laminated on a polarizing plate, and a polarizing plate in which a brightness enhancement film is further laminated on a polarizing plate are preferable.
- the reflective polarizing plate is provided with a reflective layer on the polarizing plate, and is used to form a liquid crystal display device or the like that reflects incident light from the viewing side (display side) to display.
- a built-in light source such as a backlight can be omitted, and the liquid crystal display device can be easily made thin.
- the reflective polarizing plate can be formed by an appropriate method such as a method in which a reflective layer having a strength such as a metal is provided on one surface of the polarizing plate via a transparent protective layer or the like as necessary.
- a reflective layer is formed by attaching a foil made of a reflective metal such as aluminum or the like to a vapor deposition film on one surface of a transparent protective film that has been matted as necessary.
- a transparent protective film in which fine particles are contained to form a fine surface unevenness structure and a reflective layer having a fine unevenness structure formed thereon.
- the reflective layer having the fine uneven structure described above has an advantage of diffusing incident light by irregular reflection to prevent a glaring appearance and suppress uneven brightness.
- the transparent protective film containing fine particles has an advantage that the incident light and its reflected light are diffused when passing through the transparent light-shielding film, so that uneven brightness can be further suppressed.
- the reflective layer having a fine irregular structure reflecting the fine irregular structure on the surface of the transparent protective film is formed by, for example, depositing a metal by an appropriate method such as a vapor deposition method such as a vacuum deposition method, an ion plating method, or a sputtering method or a plating method. It can be carried out by a method of directly attaching to the surface of the transparent protective layer.
- the reflective plate can be used as a reflective sheet or the like in which a reflective layer is provided on an appropriate film according to the transparent film. Since the reflective layer is usually made of a metallic material, its use in a state where the reflective surface is covered with a transparent protective film, a polarizing plate, or the like is intended to prevent a decrease in the reflectance due to oxidation and, as a result, a long-term increase in the initial reflectance. It is more preferable in terms of sustainability and avoidance of separate protective layer.
- the transflective polarizing plate can be obtained by forming a transflective reflective layer such as a half mirror that reflects and transmits light with the reflective layer.
- Transflective polarizing plate can be obtained by forming a transflective reflective layer such as a half mirror that reflects and transmits light with the reflective layer.
- liquid crystal display device or the like when the liquid crystal display device or the like is used in a relatively bright atmosphere, the image is displayed by reflecting the incident light from the viewing side (display side), and relatively Depending on the atmosphere, a liquid crystal display device or the like that is built in the back side of a transflective polarizing plate and displays an image using a built-in light source such as a backlight can be formed.
- a transflective polarizing plate can save energy for using a light source such as a knock light in a bright atmosphere, and can be used with a built-in light source even in a relatively small atmosphere. It is useful for forming.
- An elliptically polarizing plate or a circularly polarizing plate in which a retardation plate is further laminated on a polarizing plate will be described.
- a phase difference plate or the like is used.
- the phase that changes linearly polarized light to circularly polarized light or changes circularly polarized light to linearly polarized light As the difference plate, a so-called 1Z4 wavelength plate (also referred to as ⁇ 4 plate) is used.
- a 1Z2 wavelength plate (also referred to as ⁇ 2 plate) is usually used to change the polarization direction of linearly polarized light.
- An elliptically polarizing plate is effectively used for compensating (preventing) coloring (blue or yellow or the like) caused by birefringence of a liquid crystal layer of a liquid crystal display device, for example, when displaying black and white without the coloring. Further, the one in which the three-dimensional refractive index is controlled is preferable because coloring which occurs when the screen of the liquid crystal display device is viewed from an oblique direction can be compensated (prevented).
- the circularly polarizing plate is effectively used, for example, when adjusting the color tone of an image of a reflection type liquid crystal display device in which images are displayed in a single color, and has a function of preventing reflection.
- the polarizing plate obtained by bonding the polarizing plate and the brightness enhancement film is usually used by being provided on the back side of the liquid crystal cell.
- Brightness-enhancing films exhibit the property of reflecting linearly polarized light with a predetermined polarization axis or circularly polarized light in a predetermined direction when natural light enters due to reflection from the backlight or the back side of a liquid crystal display device, etc., and transmitting other light.
- the polarizing plate in which the brightness enhancement film is laminated with the polarizing plate receives light from a light source such as a backlight to obtain transmitted light of a predetermined polarization state and reflects light other than the predetermined polarization state without transmitting the light. Is done.
- the light reflected on the surface of the brightness enhancement film is further inverted through a reflection layer or the like provided on the rear side thereof and re-entered on the brightness enhancement film, and a part or all of the light is transmitted as light of a predetermined polarization state.
- the brightness can be improved. is there.
- the brightness enhancement film reflects light having a polarization direction that is absorbed by the polarizer on the brightness enhancement film without being incident on the polarizer, and further passes through a reflection layer or the like provided on the rear side thereof. Repeated inversion and re-incident on the brightness enhancement film, and only the polarized light whose polarization direction has been changed so that the polarization direction of the reflected and inverted light between the two can pass through the polarizer is obtained. Is transmitted to the polarizer Since the light is supplied, light from a backlight or the like can be efficiently used for displaying an image on the liquid crystal display device, and the screen can be brightened.
- a diffusion plate may be provided between the brightness enhancement film and the reflection layer or the like.
- the light in the polarization state reflected by the brightness enhancement film goes to the reflection layer and the like, but the diffuser provided uniformly diffuses the passing light and at the same time eliminates the polarization state and becomes a non-polarized state. That is, the diffuser returns the polarized light to the original natural light state.
- the light in the non-polarized state that is, the light in the natural light state is repeatedly directed to the reflection layer and the like, reflected through the reflection layer and the like, again passed through the diffusion plate and re-incident on the brightness enhancement film.
- the brightness of the display screen is maintained while the brightness unevenness of the display screen is reduced. It can provide a uniform and bright screen. It is probable that by providing a powerful diffuser, the number of repetitions of the first incident light was increased moderately, and it was possible to provide a uniform bright display screen in combination with the diffuser function of the diffuser. .
- the above-mentioned brightness improving film for example, such as a multilayer thin film of a dielectric or a multilayer laminate of thin films having different refractive index anisotropies, linear light having a predetermined polarization axis is transmitted and other light is transmitted.
- Reflective properties 3M, D-BEF, etc.
- cholesteric liquid crystal polymer oriented film and its oriented liquid crystal layer supported on a film substrate can be used as appropriate, such as one exhibiting the characteristic of reflecting either left-handed or right-handed circularly polarized light and transmitting the other light.
- the transmitted light is directly incident on the polarization plate with the polarization axis aligned, thereby suppressing absorption loss by the polarization plate. While allowing the light to pass through efficiently.
- a brightness enhancement film that emits circularly polarized light such as a cholesteric liquid crystal layer
- the light can be directly incident on the polarizer. It is preferable that the light is converted into a polarizing plate. By using a 1Z4 wavelength plate as the retardation plate, circularly polarized light can be converted to linearly polarized light.
- a retardation plate that functions as a 1Z4 wavelength plate in a wide wavelength range such as a visible light region is, for example, a retardation layer that functions as a 1Z4 wavelength plate for light-colored light having a wavelength of 550 nm and other retardation layers. It can be obtained by, for example, a method in which a retardation layer exhibiting properties, for example, a retardation layer functioning as a 1Z2 wavelength plate is overlapped. Therefore, the retardation plate disposed between the polarizing plate and the brightness enhancement film may have one or more retardation layer strengths.
- the cholesteric liquid crystal layer also reflects circularly polarized light in a wide wavelength range, such as a visible light region, by combining two or more layers having different reflection wavelengths and having an arrangement structure in which two or more layers are overlapped. And a circularly polarized light having a wide wavelength range can be obtained.
- the polarizing plate may be formed by laminating a polarizing plate like the above-mentioned polarized light separating type polarizing plate and two or three or more optical layers. Therefore, a reflective elliptically polarizing plate or a transflective elliptically polarizing plate obtained by combining the above-mentioned reflective polarizing plate, transflective polarizing plate and retardation plate may be used.
- the optical film and the polarizing plate on which the optical layers are laminated can be formed even by a method of sequentially laminating them in the process of manufacturing a liquid crystal display device or the like.
- it is excellent in quality stability, assembling work, and the like, and has an advantage that a manufacturing process of a liquid crystal display device or the like can be improved.
- Appropriate bonding means such as an adhesive layer can be used for lamination.
- the optical axes thereof can be set at an appropriate arrangement angle depending on the intended retardation characteristics and the like.
- the liquid crystal display device can be formed according to the conventional method.
- a liquid crystal display device is generally formed by appropriately assembling components such as an illumination system as necessary and incorporating a drive circuit.
- the optical film is used in the present invention,
- no particular limitation can be applied to the conventional method.
- the liquid crystal cell in addition to the above-described IPS mode, any type such as a VA type and a ⁇ type may be used.
- an appropriate liquid crystal display device such as an illumination system or a device using a reflector can be formed.
- a suitable component such as a diffusion plate, an anti-glare layer, an anti-reflection film, a protection plate, a prism array, a lens array sheet, a light diffusion plate, and a knock light is placed at an appropriate position in one layer. Or two or more layers can be arranged.
- the retardation film, the refractive indices nx, ny, and nz were measured by an automatic birefringence measurement device (Oji Scientific Instruments Co., Ltd., automatic birefringence meter KOBRA21ADH) to calculate Nz and in-plane retardation Re.
- an automatic birefringence measurement device Oji Scientific Instruments Co., Ltd., automatic birefringence meter KOBRA21ADH
- thermoplastic saturated norbornene-based resin (ZEONOR1600R, manufactured by Nippon Zeon Co., Ltd.) was supplied to a single-screw extruder, and extruded at 275 to 290 ° C to obtain a 50 m-thick transparent protective film.
- the in-plane retardation Re of the transparent protective film is 4 nm, and the thickness direction retardation Rth is 20 ⁇
- the transparent protective film was laminated by using an adhesive on both surfaces of a film (polarizer: 20 m) obtained by adsorbing iodine on a polybutyl alcohol-based film and extended to produce a polarizing plate.
- the following two types of retardation films (a, b) were prepared by stretching the polycarbonate film.
- the retardation film (b) has a thickness of 65 ⁇ m, in-plane retardation Re force S260nm, Nz
- a retardation film (a) and a retardation film (b) are laminated in this order using an adhesive so that the slow axis of each retardation film and the absorption axis of the polarizing plate are in a parallel state. Then, an optical film was produced.
- the optical film was laminated with an adhesive so that the retardation film (b) side was on the viewing side of the IPS mode liquid crystal cell.
- the opposite surface of the liquid crystal cell A light plate was laminated with an adhesive to produce a liquid crystal display device.
- the polarizing plate on the viewing side was laminated so that the direction of the extraordinary refractive index of the liquid crystal composition in the liquid crystal cell was perpendicular to the absorption axis of the polarizing plate when no voltage was applied.
- the absorption axis of the polarizing plate and the absorption axis of the optical film were arranged so as to be orthogonal to each other.
- the contrast ratio in the direction of inclination of 70 degrees from the normal direction was measured in the azimuth direction of 45 degrees with respect to the optical axis of the orthogonal polarizing plate, the contrast ratio was 35.
- the measurement of the contrast ratio was performed using EZ Contrast (manufactured by ELDIM). Further, the color shift was small as shown in FIG. 4 and was excellent in optical characteristics. The color shift was measured using EZ Contrast (manufactured by ELDIM). Further, after this liquid crystal display device was put under the conditions of 60 ° C. and 95% RH for 200 hours, in-plane unevenness of black display was visually observed, and almost no unevenness was observed.
- thermoplastic saturated norbornene-based resin ARTON, manufactured by JSR Corporation
- a transparent protective film having a thickness of 40 / zm was obtained by a casting method.
- the in-plane retardation Re of the transparent protective film is 4 nm and the thickness direction retardation Rth is 2
- the transparent protective film was laminated by using an adhesive on both surfaces of a film (polarizer: 20 m) obtained by adsorbing iodine on a polybutyl alcohol-based film and extended to produce a polarizing plate.
- the two types of polycarbonate retardation films (a, b) prepared in Example 1 and the polarizing plate were each placed in the order of the retardation film (a) and the retardation film (b) from the polarizing plate side.
- An optical film was produced by laminating the retardation film using an adhesive so that the slow axis of the retardation film was parallel to the absorption axis of the polarizing plate.
- the optical film was laminated with an adhesive so that the retardation film (b) side was on the viewing side of the IPS mode liquid crystal cell.
- a polarizing plate was laminated on the surface on the opposite side of the liquid crystal cell with an adhesive to produce a liquid crystal display device.
- the polarizing plate on the viewing side was laminated so that the direction of the extraordinary refractive index of the liquid crystal composition in the liquid crystal cell was perpendicular to the absorption axis of the polarizing plate when no voltage was applied.
- the absorption axis of the polarizing plate and the absorption axis of the optical film were arranged so as to be orthogonal to each other.
- the following two types of retardation films (a, b) were prepared by stretching the polycarbonate film.
- Example 2 An optical film was produced in the same manner as in Example 1 except that the retardation films (a, b) were used. Further, a liquid crystal display device was manufactured in the same manner as in Example 1. In this liquid crystal display device, the contrast ratio was measured in a direction at an inclination of 70 degrees from the normal direction in an azimuth direction of 45 degrees with respect to the optical axis of the orthogonal polarizing plate, and the contrast ratio was 35. The color shift was as shown in FIG. Further, after this liquid crystal display device was put under the conditions of 60 ° C. and 95% RH for 200 hours, in-plane unevenness of black display was visually observed, and almost no unevenness was observed.
- the retardation film (a) has a thickness of 65 ⁇ m, in-plane retardation Re force S260nm, Nz
- the retardation film (b) has a thickness of 65 ⁇ m, in-plane retardation Re force S260nm, Nz
- An optical film was produced in the same manner as in Example 1, except that the retardation films (a, b) were used. Further, a liquid crystal display device was manufactured in the same manner as in Example 1. In this liquid crystal display device, the contrast ratio was measured in a direction at an inclination of 70 degrees from the normal direction in an azimuth direction of 45 degrees with respect to the optical axis of the orthogonal polarizing plate, and the contrast ratio was 35. The color shift was as shown in FIG. Further, after this liquid crystal display device was put under the conditions of 60 ° C. and 95% RH for 200 hours, in-plane unevenness of black display was visually observed, and almost no unevenness was observed.
- a polarizing plate was produced by laminating a triacetyl cellulose film as a transparent protective film on both sides of a film (polarizer: 2O ⁇ m) obtained by adsorbing iodine on a polybutyl alcohol-based film and using an adhesive.
- the triacetyl cellulose film had a thickness of 80 m, an in-plane retardation Re of 4 nm, and a thickness direction retardation Rth of 45 nm.
- the polarizing plate was laminated on both surfaces of the same IPS mode liquid crystal cell as in Example 1 with an adhesive to produce a liquid crystal display device.
- the polarizing plates disposed on both sides of the liquid crystal cell were disposed such that the polarization axes were orthogonal to each other.
- the polarizing plate used in Example 1 was laminated on both sides of an IPS mode liquid crystal cell similar to that of Example 1 with an adhesive to produce a liquid crystal display device.
- the polarizing plates arranged on both sides of the liquid crystal cell were arranged so that the polarization axes were orthogonal to each other.
- the two types of polycarbonate retardation films (a, b) prepared in Example 1 were directly applied to the polarizer so that the slow axis was parallel to the absorption axis of the polarizer.
- An optical film was produced by laminating in order of the difference film (b).
- the optical film thus produced was laminated with an adhesive in the same manner as in Example 1 such that the retardation film side was on the viewing side of the IPS mode liquid crystal cell.
- the polarizing plate used in Example 1 was laminated on the opposite surface with an adhesive to produce a liquid crystal display device.
- the contrast ratio in the direction of inclination of 70 degrees from the normal direction in the azimuth direction 45 degrees with respect to the optical axis of the orthogonal polarizing plate was 50.
- the in-plane unevenness of the black display was visually observed, and the retardation film caused by the shrinkage of the polarizing plate was observed. Unevenness due to a change in the phase difference value was observed.
- the retardation film having an in-plane retardation of 100 nm and Nz 0.5, obtained by stretching the polycarbonate film on the polarizing plate prepared in Example 1, was applied to the retardation film of the retardation film and the absorption of the polarizing plate.
- An optical film was produced by laminating the adhesive so that the axes were parallel.
- the optical film thus produced was laminated with an adhesive in the same manner as in Example 1 so that the retardation film side was on the viewing side of the IPS mode liquid crystal cell.
- the polarizing plate used in Example 1 was laminated on the opposite surface with an adhesive to produce a liquid crystal display device.
- An optical film was produced by laminating the adhesive so that the axes were parallel.
- the optical film thus produced was subjected to a retardation in the same manner as in Example 1.
- the film was laminated with an adhesive so that the film side was on the viewing side of the IPS mode liquid crystal cell.
- the polarizing plate used in Example 1 was laminated on the opposite surface with an adhesive to produce a liquid crystal display device.
- An optical film was produced by laminating the adhesive so that the axes were parallel.
- the optical film thus produced was laminated with an adhesive in the same manner as in Example 1 so that the retardation film side was on the viewing side of the IPS mode liquid crystal cell.
- the polarizing plate used in Example 1 was laminated on the opposite surface with an adhesive to produce a liquid crystal display device.
- a polarizing plate was produced by laminating a triacetyl cellulose film as a transparent protective film on both sides of a film (polarizer: 2O ⁇ m) obtained by adsorbing iodine on a polybutyl alcohol-based film and using an adhesive.
- the retardation film (a, b) made of polycarbonate prepared in Example 1 was placed on the polarizing plate such that the slow axis of the retardation film (a, b) and the absorption axis of the polarizing plate were in a parallel state. Then, an optical film was produced by laminating with an adhesive.
- the optical film thus produced was laminated with an adhesive in the same manner as in Example 1 such that the retardation film (b) side was on the viewing side of the liquid crystal cell in the IPS mode.
- the polarizing plate used in Example 1 was laminated on the opposite surface with an adhesive to produce a liquid crystal display device.
- the optical film of the present invention in which a polarizing plate and a plurality of retardation films are laminated is suitable for an image display device such as a liquid crystal display device, a PDP, and a CRT.
- the optical film of the present invention is suitable for a liquid crystal display device that operates in a so-called IPS mode.
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- Optics & Photonics (AREA)
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- Crystallography & Structural Chemistry (AREA)
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Abstract
Description
Claims
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US10/572,600 US7466381B2 (en) | 2003-09-25 | 2004-09-13 | Optical film and image viewing display |
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JP2003333601A JP4136871B2 (ja) | 2003-09-25 | 2003-09-25 | 光学フィルムおよび画像表示装置 |
JP2003-333601 | 2003-09-25 |
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US (1) | US7466381B2 (ja) |
JP (1) | JP4136871B2 (ja) |
KR (1) | KR100784750B1 (ja) |
CN (1) | CN100495086C (ja) |
TW (1) | TWI244558B (ja) |
WO (1) | WO2005031406A1 (ja) |
Cited By (1)
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CN101995599A (zh) * | 2009-08-10 | 2011-03-30 | 住友化学株式会社 | 复合偏振片及tn模式液晶面板 |
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JP2006058540A (ja) * | 2004-08-19 | 2006-03-02 | Jsr Corp | 光学フィルム、偏光板および液晶ディスプレイ |
US7582339B2 (en) | 2004-11-15 | 2009-09-01 | Lg Chem, Ltd. | Biaxial-optical polynorbornene-based film and method of manufacturing the same, integrated optical compensation polarizer having the film and method of manufacturing the polarizer, and liquid crystal display panel containing the film and/or polarizer |
JPWO2007004399A1 (ja) * | 2005-07-05 | 2009-01-22 | コニカミノルタオプト株式会社 | 透過型液晶表示装置 |
KR101232732B1 (ko) | 2006-05-22 | 2013-02-13 | 삼성디스플레이 주식회사 | 편광판 및 이를 이용한 액정표시장치 |
JP2007316186A (ja) * | 2006-05-24 | 2007-12-06 | Jsr Corp | 光学フィルム、偏光板および液晶パネル |
JP2008003264A (ja) * | 2006-06-22 | 2008-01-10 | Jsr Corp | 光学フィルム、偏光板および液晶パネル |
JP5038745B2 (ja) * | 2007-03-08 | 2012-10-03 | 富士フイルム株式会社 | 透明保護フィルム、光学補償フィルム、偏光板、及び液晶表示装置 |
JP2009192866A (ja) * | 2008-02-15 | 2009-08-27 | Epson Imaging Devices Corp | 液晶装置及び電子機器 |
JP5129682B2 (ja) * | 2008-08-04 | 2013-01-30 | スタンレー電気株式会社 | 液晶表示素子 |
KR101314480B1 (ko) * | 2008-12-26 | 2013-10-07 | 주식회사 엘지화학 | 면상 스위치 모드 lcd용 편광판 및 이를 포함하는 면상 스위치 모드 lcd |
JP5546766B2 (ja) * | 2009-01-07 | 2014-07-09 | 日東電工株式会社 | 液晶パネルおよび液晶表示装置 |
CN101813798B (zh) * | 2009-02-23 | 2013-08-28 | 住友化学株式会社 | 复合偏振板和使用其的ips模式液晶显示装置 |
JP5654228B2 (ja) | 2009-11-13 | 2015-01-14 | 株式会社ジャパンディスプレイ | 液晶表示装置及び液晶表示装置の製造方法 |
TWI566007B (zh) * | 2010-04-26 | 2017-01-11 | 友達光電股份有限公司 | 立體顯示器 |
US9703011B2 (en) * | 2013-05-07 | 2017-07-11 | Corning Incorporated | Scratch-resistant articles with a gradient layer |
US10408989B2 (en) * | 2015-04-29 | 2019-09-10 | Samsung Sdi Co., Ltd. | Optical film for improving contrast ratio, polarizing plate including same, and liquid crystal display device including same |
KR102126052B1 (ko) * | 2017-12-04 | 2020-06-23 | 삼성에스디아이 주식회사 | 발광표시장치용 편광판 및 이를 포함하는 발광표시장치 |
JP2019158953A (ja) * | 2018-03-08 | 2019-09-19 | シャープ株式会社 | 円偏光板、表示装置、及び、積層型位相差板 |
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-
2004
- 2004-09-13 CN CNB2004800266724A patent/CN100495086C/zh active Active
- 2004-09-13 WO PCT/JP2004/013323 patent/WO2005031406A1/ja active Application Filing
- 2004-09-13 US US10/572,600 patent/US7466381B2/en active Active
- 2004-09-13 KR KR1020067003082A patent/KR100784750B1/ko active IP Right Grant
- 2004-09-23 TW TW093128866A patent/TWI244558B/zh active
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JP2000284124A (ja) * | 1999-03-31 | 2000-10-13 | Fuji Photo Film Co Ltd | 楕円偏光板およびtn型液晶表示装置 |
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CN101995599B (zh) * | 2009-08-10 | 2014-09-03 | 住友化学株式会社 | 复合偏振片及tn模式液晶面板 |
Also Published As
Publication number | Publication date |
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TWI244558B (en) | 2005-12-01 |
CN1853119A (zh) | 2006-10-25 |
JP2005099475A (ja) | 2005-04-14 |
US7466381B2 (en) | 2008-12-16 |
TW200523582A (en) | 2005-07-16 |
KR20060032660A (ko) | 2006-04-17 |
CN100495086C (zh) | 2009-06-03 |
JP4136871B2 (ja) | 2008-08-20 |
KR100784750B1 (ko) | 2007-12-13 |
US20070091236A1 (en) | 2007-04-26 |
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