WO2005031407A1 - 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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- WO2005031407A1 WO2005031407A1 PCT/JP2004/013324 JP2004013324W WO2005031407A1 WO 2005031407 A1 WO2005031407 A1 WO 2005031407A1 JP 2004013324 W JP2004013324 W JP 2004013324W WO 2005031407 A1 WO2005031407 A1 WO 2005031407A1
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- Prior art keywords
- film
- retardation
- liquid crystal
- polarizing plate
- axis
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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
-
- 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
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 provides 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 easily viewable display having a high contrast ratio over a wide range.
- the purpose is to do.
- the present invention also provides an image display device using the optical film 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 invention relates to a polarizing plate and a plurality of retardation films, wherein an absorption axis of the polarizing plate and each slow axis of the plurality of retardation films are orthogonal or parallel to each other and a plurality of retardation films are provided.
- the direction in which the in-plane refractive index in the plane of the film is maximized 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 value expressed by (nx ny) Satisfies 0.15-0.85
- 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 within the above-mentioned range for enhancing the function of compensating 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.
- a retardation film (b) and a retardation film (a) are laminated in this order, and the absorption axis of the polarizing plate and the retardation film of the two retardation films are arranged.
- 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 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 from the viewpoint of enhancing the compensating function for contrast, and furthermore,
- 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 absorption axis of the polarizing plate and the slow axis of each of the plurality of retardation films are orthogonal to each other on one surface of a polarizing plate having a transparent protective film laminated on both surfaces of a polarizer. It is preferable that the films are laminated so that they are parallel and the slow axes of the plurality of retardation films are parallel.
- At least one side of the transparent protective film has a power (A) a thermoplastic resin having a substituted side chain and a Z or unsubstituted imide group;
- It preferably contains a thermoplastic resin having Z or an unsubstituted phenyl group and -tolyl group.
- the transparent film containing a mixture of the thermoplastic resins (A) and (B) as a main component when the polarizer undergoes dimensional change under high temperature or high humidity and receives the stress, Also, a stable phase difference value can be secured. In other words, 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. In this way, by reducing the residual retardation of the transparent protective film of the polarizer, the laminated retardation film can be laminated. In addition to the ease of design, an optical film having a high compensation effect by the retardation film can be obtained.
- 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 transparent protective film is a stretched film.
- the strength of a film material can be improved by stretching, and more robust mechanical properties can be obtained.
- Many materials cannot be used as a protective film for a polarizer because a retardation is generated by stretching.
- a transparent film containing a mixture of the thermoplastic resins (A) and (B) as a main component can satisfy the in-plane retardation and the thickness direction retardation even when stretched.
- the stretching process can be either uniaxial stretching or biaxial stretching! ⁇ . In particular, a biaxially stretched film is preferred.
- 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
- the optical film is arranged on the cell substrate on the 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 side of the polarizing plate includes (A) a thermoplastic resin having a substituted or unsubstituted imide group in a side chain, and (B) a thermoplastic resin having a side chain. It preferably contains a thermoplastic resin having a substituted or unsubstituted phenyl group and -tolyl group.
- 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 plane 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,
- the transparent protective film is preferably a biaxially stretched film.
- an IPS mode liquid crystal display device is suitable.
- 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 It is possible to reduce light leakage during black display.
- 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.
- a transparent protective film containing a mixture of the thermoplastic resins (A) and (B) as a main component is used as a transparent protective film of a polarizing plate disposed on the liquid crystal cell surface.
- a transparent protective film containing a mixture of the thermoplastic resins (A) and (B) as a main component is used as a transparent protective film of a polarizing plate disposed on the liquid crystal cell surface.
- 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 a fifth embodiment.
- FIG. 9 is a view showing a color shift of a sixth embodiment.
- FIG. 10 is a view showing a color shift of Comparative Example 1.
- FIG. 11 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.
- a polarizer can be used as it is, or a transparent protective film can be laminated and used.
- FIGS. 1 (A) and 1 (B) a polarizing plate 1 in which a transparent protective film lb is laminated on both surfaces of a polarizer la is used.
- FIG. 1A shows an example in which two retardation films 2a and 2b are laminated in this order on one surface of a polarizing plate 1.
- FIG. 1A the absorption axis of the polarizing plate 1 and the slow axis of the retardation film 2 (a, b) are laminated so as to be parallel.
- FIG. 1B 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 to each other.
- 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 have an Nz value satisfying 0.15 to 0.85, and have an in-plane retardation Re force of 200 to 350 nm.
- the z value satisfies 0.65-0.85, and the Nz value of the retardation film 2b is 0.15-0. It is preferable to use one that satisfies 35.
- the retardation film one that satisfies 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 crystalline polymer examples include a conjugated linear atomic group imparting liquid crystal orientation.
- main chain and side chain types in which (mesogen) is introduced into the main chain and side chain of the polymer.
- 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. Dissolution of liquid crystalline polymer It is preferable that the liquid crystal polymer is oriented by developing and heat-treating the liquid, and 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.
- 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
- iodine and a dichroic dye 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.
- 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 the film to 3 to 7 times its original length.
- iodine an aqueous solution of iodine and stretching the film to 3 to 7 times its original length.
- Stretching may be performed after dyeing with iodine, may be performed while dyeing, or 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.
- the material for forming the transparent protective film provided on the polarizer is not particularly limited.
- the transparent protective film containing strong thermoplastic resins (A) and (B) can be used both when subjected to stress due to dimensional change of the polarizer and when stretched so that a retardation is not generated.
- Transparent protective film containing strong thermoplastic resins (A) and (B) Lum is described, for example, in WO01Z37007.
- the transparent protective film can contain other resins even when the thermoplastic resins (A) and (B) are the main components.
- the thermoplastic resin (A) has a substituted or Z or unsubstituted imide group in the side chain, and the main chain is an arbitrary thermoplastic resin.
- the main chain may be, for example, a main chain composed of only carbon, or an atom other than carbon may be inserted between carbons. Nuclear power other than carbon may also be provided.
- the main chain is preferably a hydrocarbon or a substitute thereof.
- the main chain is obtained, for example, by addition polymerization. Specifically, it is, for example, polyolefin or polybutyl.
- the main chain is obtained by condensation polymerization. For example, it can be obtained by an ester bond, an amide bond and the like.
- the main chain is preferably a polyvinyl skeleton obtained by polymerizing a substituted vinyl monomer.
- any conventionally known method can be adopted.
- a method of polymerizing the monomer having an imide group a method of polymerizing various monomers to form a main chain, and then introducing the imide group, a method of grafting the compound having the imide group to a side chain, and the like.
- the substituent of the imide group a conventionally known substituent capable of substituting the hydrogen of the imide group can be used.
- an alkyl group and the like can be mentioned.
- the thermoplastic resin (A) is a binary resin or more containing at least one type of repeating unit derived from Olefinca and at least one type of repeating unit having a substituted or Z- or unsubstituted maleimide structure. Is preferred.
- the above-mentioned olefin 'maleimide copolymer can be synthesized from an olefin and a maleimide compound by a known method. The synthesis method is described, for example, in JP-A-5-59193, JP-A-5-195801, JP-A-6-136058 and JP-A-9-328523.
- olefins examples include, for example, isobutene, 2-methyl-1-butene, 2-methyl-1-pentene, 2-methyl-1-hexene, 2-methyl-1 heptene, 2-methyl-1 heptene, 1-isootaten, and 2-methyl- 1 otaten, 2-ethyl-2-pentene, 2-ethyl-2-butene, 2-methyl-2-pentene, 2-methyl-2-hexene and the like. Of these, isobutene is preferred. These olefins may be used alone or in combination of two or more.
- maleimide compound examples include maleimide, N-methylmaleimide, N-ethylmaleimide, Nn-propylmaleimide, N-i-propylmaleimide, N-n-butylmaleimide, Ns-butylmaleimide, Nt-butylmaleimide, and N-butylmaleimide.
- the content of the repeating unit of olefin is not particularly limited, but is about 20 to 70 mol%, preferably 40 to 70 mol% of the total repeating units of the thermoplastic resin (A). 60 mol 0 more preferably from 45- 55 mole 0/0. Content that a repetitive unit of a maleimide structure 30- 80 mol% or so, preferably from 40- 60 mole 0 further rather preferably is 45- 55 mol 0/0.
- the thermoplastic resin (A) contains the above-mentioned repeating unit of olefin and a repeating unit of a maleimide structure, and can be formed only by these units. Further in addition to the other bi -! Repeating units of Le monomer contains a proportion of 50 mole 0/0 or less /, even I /,.
- Other vinyl monomers include acrylic monomers such as methyl acrylate and butyl acrylate, methacrylic monomers such as methyl methacrylate and cyclohexyl methacrylate, and vinyl esters such as vinyl acetate.
- vinyl ether monomers such as methyl vinyl ether
- acid anhydrides such as maleic anhydride
- styrene monomers such as styrene, ⁇ -methylstyrene, and ⁇ -methoxystyrene.
- the weight average molecular weight of the thermoplastic resin ( ⁇ ) is not particularly limited, but is about 1 X 10 -5 X 10 6 .
- the weight average molecular weight is preferably 1 ⁇ 10 4 or more, more preferably 5 ⁇ 10 5 or less.
- the glass transition temperature of the thermoplastic resin ( ⁇ ) is at least 80 ° C, preferably at least 100 ° C, more preferably at least 130 ° C.
- thermoplastic resin (A) a dartalimide-based thermoplastic resin can be used. Daltarimide resins are described in JP-A-2-153904 and the like. Gluta The ruimide resin has a daltarimide structural unit and a methyl acrylate or methyl methacrylate structural unit. The above-mentioned other vinyl monomers can be introduced into the dartalimide resin.
- the thermoplastic resin (B) is a thermoplastic resin having a substituted or Z- or unsubstituted phenyl group and a -tolyl group in a side chain.
- the main chain of the thermoplastic resin (B) may be the same as that of the thermoplastic resin (A).
- Examples of the method for introducing the fluor group into the thermoplastic resin (B) include, for example, a method of polymerizing the monomer having the phenol group, and a method of polymerizing various monomers to form a main chain. And a method of introducing a phenyl group, and a method of grafting a compound having a phenyl group to a side chain.
- a substituent of the phenyl group a conventionally known substituent capable of substituting hydrogen of the phenyl group can be used.
- an alkyl group and the like can be mentioned.
- the method for introducing a -tolyl group into the thermoplastic resin (B) can be the same as the method for introducing a phenyl group.
- the thermoplastic resin (B) is a binary or ternary resin containing a repeating unit derived from unsaturated-tolyl compound power (nitrile unit) and a repeating unit derived from styrene-based compound power (styrene-based unit). It is preferably a multi-component copolymer or higher. For example, an acrylonitrile-styrene-based copolymer can be preferably used.
- Examples of the unsaturated-tolylyl conjugate include any compound having a cyano group and a reactive double bond.
- ⁇ -substituted unsaturated-tolyl such as acrylonitrile and metal-tolyl-tolyl, and fumaro-tolyl-containing ⁇ - , ⁇ -disubstituted olefinic unsaturated-bonded toryl conjugate and the like.
- Examples of the styrene-based compound include any compound having a phenyl group and a reactive double bond. Examples thereof include unsubstituted or substituted styrene compounds such as styrene, vinyltoluene, methoxystyrene, and chlorostyrene, and substituted styrene compounds such as hexamethylstyrene.
- the content of -tolyl unit in the thermoplastic resin (II) is not particularly limited, but is about 10 to 70% by weight, preferably 20 to 60% by weight, and preferably 2 0- 50 weight 0/0. Particularly 20- 40 weight 0/0, preferably 20- 30 weight 0/0. Styrene-based Units, 30- 80 wt% or so, preferably from 40- 80 wt%, more preferably 50 to 80 weight 0/0. In particular 60- 80 weight 0/0, preferably 70 to 80 weight 0/0.
- the thermoplastic resin (B) contains the -tolyl unit and the styrene-based unit, and can be formed only by these units. Further, other than the above, a repeating unit of another vinyl monomer may be contained at a ratio of 50 mol% or less. Examples of other butyl monomers include those exemplified for thermoplastic resin (A), repeating units of olefin, maleimide, and repeating units of substituted maleimide. As the thermoplastic resin (B), AS resin, ABS resin, ASA resin and the like can be mentioned.
- the weight average molecular weight of the thermoplastic resin (B) is not particularly limited, but is about 1 ⁇ 10 3 —5 ⁇ 10 6 . Preferably it is 1 ⁇ 10 4 or more and 5 ⁇ 10 5 or less.
- the ratio between the thermoplastic resin (A) and the thermoplastic resin (B) is adjusted according to the phase difference required for the transparent protective film.
- the content of the thermoplastic resin (A) is preferably from 50 to 95% by weight of the total amount of the resin in the film, more preferably from 60 to 95% by weight. Is more preferably 65 to 90% by weight.
- the content of the thermoplastic resin (B) is preferably 5 to 50% by weight of the total amount of the resin in the film, more preferably 5 to 40% by weight, and further preferably 10 to 40% by weight. 35% by weight.
- the thermoplastic resin (A) and the thermoplastic resin (B) are mixed by hot-melt kneading.
- the transparent protective film used for the polarizer includes (A) a thermoplastic resin having a substituted and Z or unsubstituted imide group in the side chain, and (B) a substituted and Z or unsubstituted phenyl group in the side chain.
- Those containing a thermoplastic resin having a -tol group and a -tolyl group can be preferably used.
- a transparent protective film using the material can be used by being laminated on both surfaces of a polarizer, and a transparent protective film containing the material is used on one surface of a polarizer, and one surface of the other polarizer is Transparent protective films of other materials can be used.
- a transparent protective film of a material other than the above can be used on both surfaces of the polarizer.
- 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
- AS resin copolymers
- polyolefins such as polyethylene, polypropylene, polyolefin having a cyclo- or norbornene structure, polyolefin-based polymers such as ethylene-propylene copolymers, butyl-based polymers, amide-based polymers such as nylon and aromatic polyamide, imide-based polymers, and snorehon Polymers, polyetherenolesnorethone polymers, polyetherenolethenoleketone polymers, polyphenylene sulfide polymers, butyl alcohol polymers, bilidene chloride polymers, butyl butyral polymers, arylate polymers
- the polymer forming the transparent protective film include a polyoxymethylene-based polymer, an epoxy-based polymer, and a blend of the polymer.
- the transparent protective film can also be formed as a cured layer of a thermosetting or 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 bonded 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, and is, for example, a cure that is excellent in hardness, slip characteristics, and the like by an appropriate ultraviolet-curable resin such as an acrylic or silicone resin.
- 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 outside light is reflected on the surface of the polarizing plate, and the transmitted light of the polarizing plate is visually recognized. This is performed for the purpose of preventing obstruction, etc., and is applied to the surface of the transparent protective film by an appropriate method such as a sandblasting method, a roughening method by a boss processing method, or a mixing method of transparent fine particles. It can be formed by providing a fine uneven structure. 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, and can be provided separately as an optical layer separately from the transparent protective film. It can also be provided.
- an isocyanate-based adhesive for the bonding treatment between the polarizer and the transparent protective film, an isocyanate-based adhesive, a polyvinyl alcohol-based adhesive, a gelatin-based adhesive, a bull-based latex-based, an aqueous polyester, or the like is used.
- 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.
- the optical film of the present invention is suitably used for an IPS mode liquid crystal display device.
- 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 disposed on the viewing side or light incident side of the liquid crystal cell.
- 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 polarizer la similar to that used for the optical film 3 and a transparent protective film lb laminated on both surfaces is used.
- the substrate of the liquid crystal cell 4 on the opposite side (light incident side) to the viewing side is: 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 polarizing plate in which a brightness enhancement film is further laminated on the plate is 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 specific example of the reflective polarizing plate is a transparent protective film that has been matted as necessary and has a reflective layer formed by attaching a foil made of a reflective metal such as aluminum to a vapor deposition film on one surface of the transparent protective film. And so on. Further, there may be mentioned, for example, 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 transmitted through the 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 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 mirror that reflects and transmits light on the reflective layer.
- liquid crystal cell When using a liquid crystal display device or the like in a relatively bright atmosphere, it reflects an incident light from the viewing side (display side) to display an image, and A liquid crystal display device which 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.
- a phase difference plate or the like is used.
- a so-called 1Z4 wavelength plate (also referred to as a ⁇ plate) is used as a phase difference plate for changing linearly polarized light to circularly polarized light or for converting circularly polarized light to linearly polarized light.
- a 1Z2 wavelength plate (also referred to as ⁇ 2 plate) is usually used to change the polarization direction of linearly polarized light.
- the elliptically polarizing plate is used effectively for compensating (preventing) coloring (blue or yellow or the like) caused by birefringence of the liquid crystal layer of the 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 laminating the polarizing plate and the brightness enhancement film is usually used by being provided on the back side of a 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 through a reflection layer or the like provided on the rear side thereof.
- a diffusion plate may be provided between the brightness enhancement film and the above-mentioned 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 enhancing film is, for example, a multilayer thin film of a dielectric or a multilayer laminate of thin films having different refractive index anisotropies.
- Reflective characteristics (3M, D-BEF, etc.), cholesteric liquid crystal polymer oriented film and its oriented liquid crystal layer supported on a film substrate (Nitto Denko, PCF350 and Merck) , Transmax, etc.), an appropriate material such as one exhibiting the characteristic of reflecting either left-handed or right-handed circularly polarized light and transmitting the other light can be used.
- the transmitted light is directly incident on the polarizing plate with the polarization axis aligned, thereby suppressing absorption loss due to the polarizing 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, can be directly incident on a polarizer.However, in order to suppress absorption loss, the circularly polarized light is linearly polarized through a phase difference plate. 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 the visible light region has, 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 characteristics. It can be obtained by, for example, a method of superimposing a retardation layer shown, for example, a retardation layer functioning as a 1Z2 wavelength plate. 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 the 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 such as 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. In addition, 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 a conventional method.
- liquid crystal display devices are used to assemble components such as lighting systems as necessary and incorporate drive circuits.
- the optical film is used.
- 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 with an automatic birefringence measuring device (Oji Scientific Instruments Co., Ltd., automatic birefringence meter KOBRA21ADH) to calculate Nz and in-plane retardation Re.
- an automatic birefringence measuring device Oji Scientific Instruments Co., Ltd., automatic birefringence meter KOBRA21ADH
- Isobutene and N-methyl maleimide mosquito ⁇ et consisting alternating copolymer and (N-methyl maleimide containing Yuryou 50 mole 0/0) 75 parts by weight
- Atari port acrylonitrile content is 28 weight 0/0 - DOO drill styrene copolymer 25 parts by weight of the polymer were dissolved in methylene chloride to obtain a solution having a solid content of 15% by weight. This solution was spread on a glass plate, cast on a polyethylene terephthalate film, allowed to stand at room temperature for 60 minutes, and then the film strength was released.
- a polarizing plate was prepared by laminating the transparent protective film on both sides of a film (polarizer: 20 m) obtained by adsorbing iodine on a polybutyl alcohol-based film and using an adhesive. It was.
- the following two types of retardation films (a, b) were prepared by stretching the polycarbonate film.
- 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
- 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.
- 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 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 50.
- 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.
- the transparent protective film produced in the same manner as in Example 1 was stretched 1.5 times at 160 ° C in the MD direction, and then 1.5 times at 160 ° C in the TD direction.
- This stretched film has a thickness of 45 / zm, the in-plane retardation Re was 4 nm, and the thickness direction retardation Rth was 12 nm.
- a polarizing plate and an optical film were produced in the same manner as in Example 1 except that this transparent protective film was used. Further, a liquid crystal display device was manufactured in the same manner as in Example 1. In this liquid crystal display device, when the contrast ratio in the direction of inclination of 70 degrees from the normal direction in the azimuth direction of 45 degrees with respect to the optical axis of the orthogonal polarizing plate was measured, the contrast ratio was 40. Further, the color shift was small as shown in FIG. 5 and was excellent in optical characteristics. Further, after this liquid crystal display device was injected under the conditions of 60 ° C. and 95% RH for 200 hours, in-plane unevenness of black display was visually observed, and it was found that almost no unevenness was observed.
- 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 a direction of inclination 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 color shift was as shown in FIG.
- 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 the position of the retardation film caused by shrinkage of the polarizing plate was confirmed. Unevenness due to a change in the phase difference value was observed.
- Daltarimide copolymer consisting of N-methyldaltarimide and methyl methacrylate (N-methyldaltarimide content: 75% by weight, acid content: 0.01 meq / g or less, glass transition temperature: 147 ° C)
- the retardation in the thickness direction was 2 nm, and the thickness difference was 3 nm.
- a polarizing plate and an optical film were produced in the same manner as in Example 1 except that this transparent protective film was used. Further, a liquid crystal display device was manufactured in the same manner as in Example 1. In this liquid crystal display device, when 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, the contrast ratio was 55. Further, the color shift was small as shown in FIG. 7 and was excellent in optical characteristics. Further, after this liquid crystal display device was injected under the conditions of 60 ° C. and 95% RH for 200 hours, in-plane unevenness of black display was visually observed, and it was found that almost no unevenness was observed.
- the following two types of retardation films (a, b) were prepared by stretching the polycarbonate film.
- Example 1 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 following two types of retardation films (a, b) were prepared by stretching the polycarbonate film.
- the retardation film (a) has a thickness of 65 ⁇ m, in-plane retardation Re force S260nm, Nz
- Example 1 An optical film was produced in the same manner as in Example 1, except that the above 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 sides 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 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 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 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. [0117] In this liquid crystal display device, when the contrast ratio in the direction of inclination 70 degrees from the normal direction was measured in the azimuth direction 45 degrees with respect to the optical axis of the orthogonal polarizing plate, the contrast ratio was 8.
- 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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Abstract
Description
Claims
Priority Applications (1)
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US10/572,602 US7466382B2 (en) | 2003-09-25 | 2004-09-13 | Optical film and image display |
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JP2003-333610 | 2003-09-25 | ||
JP2003333610A JP4136872B2 (ja) | 2003-09-25 | 2003-09-25 | 光学フィルムおよび画像表示装置 |
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US (1) | US7466382B2 (ja) |
JP (1) | JP4136872B2 (ja) |
KR (2) | KR20060027868A (ja) |
CN (1) | CN100495087C (ja) |
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TW200536891A (en) * | 2004-03-31 | 2005-11-16 | Teijin Dupont Films Japan Ltd | Oriented film, process for producing the same and laminate thereof |
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 |
KR101157976B1 (ko) * | 2005-04-22 | 2012-06-25 | 엘지디스플레이 주식회사 | 액정표시모듈 |
JP2006337569A (ja) * | 2005-05-31 | 2006-12-14 | Kaneka Corp | 偏光子保護フィルムならびにそれを用いた偏光板、液晶表示装置 |
JP2007003917A (ja) * | 2005-06-24 | 2007-01-11 | Konica Minolta Opto Inc | 透過型液晶表示装置 |
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 |
JP2007057665A (ja) | 2005-08-23 | 2007-03-08 | Fujifilm Corp | 光学フィルム、画像表示装置、液晶表示装置 |
US20070076155A1 (en) | 2005-09-09 | 2007-04-05 | Fuji Photo Film Co., Ltd. | Optical film, optical compensation film, polarizing plate and liquid crystal display |
JP4731269B2 (ja) * | 2005-10-06 | 2011-07-20 | 国立大学法人東北大学 | 偏光素子、液晶パネル、および液晶表示装置 |
JP4849454B2 (ja) * | 2006-05-12 | 2012-01-11 | 日東電工株式会社 | 楕円偏光板およびそれを用いた画像表示装置 |
TW200745689A (en) * | 2006-06-06 | 2007-12-16 | Toppoly Optoelectronics Corp | Systems for displaying images |
JP2007328246A (ja) * | 2006-06-09 | 2007-12-20 | Fujifilm Corp | 液晶表示装置 |
KR101431292B1 (ko) * | 2006-10-24 | 2014-08-20 | 코니카 미놀타 어드밴스드 레이어즈 인코포레이티드 | Ips형 액정 표시 장치 및 ips형 액정 표시 장치의 제조 방법 |
JP5393048B2 (ja) * | 2007-06-29 | 2014-01-22 | 日東電工株式会社 | 液晶表示装置および積層偏光板ならびに偏光光源装置 |
KR20100037294A (ko) * | 2008-10-01 | 2010-04-09 | 삼성전자주식회사 | 액정 표시 장치 |
WO2013051847A2 (ko) * | 2011-10-04 | 2013-04-11 | 주식회사 엘지화학 | 수지 조성물 및 이를 이용하여 형성된 광학 보상필름 |
TWI516537B (zh) * | 2011-10-04 | 2016-01-11 | Lg化學股份有限公司 | 樹脂組成物及使用其形成之光學補償膜 |
JP2017090637A (ja) * | 2015-11-09 | 2017-05-25 | 大日本印刷株式会社 | 加飾部材 |
JP6454756B2 (ja) | 2017-06-02 | 2019-01-16 | 日東電工株式会社 | 液晶表示装置 |
KR102616464B1 (ko) | 2018-09-11 | 2023-12-21 | 고려대학교 산학협력단 | 무인비행체와 측정장치를 이용한 구조체의 안전점검 및 유지관리 시스템과 이를 이용한 방법 |
JP7317549B2 (ja) | 2019-04-02 | 2023-07-31 | 日東電工株式会社 | 偏光板および画像表示装置 |
KR102325624B1 (ko) * | 2020-06-25 | 2021-11-12 | 동우 화인켐 주식회사 | Oled용 편광판 및 이를 포함하는 화상표시장치 |
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2003
- 2003-09-25 JP JP2003333610A patent/JP4136872B2/ja not_active Expired - Fee Related
-
2004
- 2004-09-13 CN CNB2004800269154A patent/CN100495087C/zh not_active Expired - Fee Related
- 2004-09-13 WO PCT/JP2004/013324 patent/WO2005031407A1/ja active Application Filing
- 2004-09-13 US US10/572,602 patent/US7466382B2/en active Active
- 2004-09-13 KR KR1020067003081A patent/KR20060027868A/ko not_active Application Discontinuation
- 2004-09-13 KR KR1020077023388A patent/KR100817460B1/ko active IP Right Grant
- 2004-09-23 TW TW093128867A patent/TW200519426A/zh not_active IP Right Cessation
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
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 |
JP2001350022A (ja) * | 2000-04-07 | 2001-12-21 | Tatsuo Uchida | 広視野角偏光板 |
JP2002338703A (ja) * | 2001-05-11 | 2002-11-27 | Kanegafuchi Chem Ind Co Ltd | 透明フィルム |
JP2003240957A (ja) * | 2002-02-22 | 2003-08-27 | Sumitomo Chem Co Ltd | 偏光変換素子及び投射型液晶表示装置 |
Also Published As
Publication number | Publication date |
---|---|
US20070002228A1 (en) | 2007-01-04 |
CN100495087C (zh) | 2009-06-03 |
TWI341930B (ja) | 2011-05-11 |
TW200519426A (en) | 2005-06-16 |
JP4136872B2 (ja) | 2008-08-20 |
KR20070114811A (ko) | 2007-12-04 |
JP2005099476A (ja) | 2005-04-14 |
CN1853122A (zh) | 2006-10-25 |
US7466382B2 (en) | 2008-12-16 |
KR100817460B1 (ko) | 2008-03-27 |
KR20060027868A (ko) | 2006-03-28 |
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