WO2006092917A1 - 光学フィルムおよびその製造方法、ならびに該光学フィルムを用いた画像表示装置 - Google Patents
光学フィルムおよびその製造方法、ならびに該光学フィルムを用いた画像表示装置 Download PDFInfo
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- WO2006092917A1 WO2006092917A1 PCT/JP2006/301410 JP2006301410W WO2006092917A1 WO 2006092917 A1 WO2006092917 A1 WO 2006092917A1 JP 2006301410 W JP2006301410 W JP 2006301410W WO 2006092917 A1 WO2006092917 A1 WO 2006092917A1
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- optical compensation
- compensation layer
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- liquid crystal
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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
- G02F1/133634—Birefringent elements, e.g. for optical compensation the refractive index Nz perpendicular to the element surface being different from in-plane refractive indices Nx and Ny, e.g. biaxial or with normal optical axis
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/28—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising
- G02B27/281—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising used for attenuating light intensity, e.g. comprising rotatable 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
- G02B5/3083—Birefringent or phase retarding elements
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2323/00—Functional layers of liquid crystal optical display excluding electroactive liquid crystal layer characterised by chemical composition
- C09K2323/03—Viewing layer characterised by chemical composition
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2323/00—Functional layers of liquid crystal optical display excluding electroactive liquid crystal layer characterised by chemical composition
- C09K2323/03—Viewing layer characterised by chemical composition
- C09K2323/031—Polarizer or dye
Definitions
- OPTICAL FILM OPTICAL FILM, MANUFACTURING METHOD THEREOF, AND IMAGE DISPLAY DEVICE USING THE OPTICAL FILM
- the present invention relates to an optical film, a method for manufacturing the same, and an image display device using the optical film. More specifically, the present invention relates to an optical film that contributes to thinning, prevents heat unevenness, and can satisfactorily prevent light leakage in black display, its simple and inexpensive manufacturing method, and such an optical film. The present invention relates to an image display device using the.
- a transflective liquid crystal display device As a VA mode liquid crystal display device, a transflective liquid crystal display device has been proposed in addition to a transmissive liquid crystal display device and a reflective liquid crystal display device (see, for example, Patent Documents 1 and 2). .
- the transflective liquid crystal display device uses external light in a bright place as in the case of the reflective liquid crystal display device, and the display is approved by an internal light source such as a backlight in a dark place.
- the transflective liquid crystal display device employs a display system that has both a reflective type and a transmissive type, and switches between the reflective mode and the transmissive mode depending on the ambient brightness.
- the transflective liquid crystal display device can be clearly used even when the surroundings are dark while reducing power consumption, and thus is preferably used for a display portion of a portable device.
- a transflective liquid crystal display device for example, a reflective film in which a light transmission window is formed on a metal film such as aluminum is provided on the inner side of the lower substrate, and this reflective film is semi-finished.
- a liquid crystal display device that functions as a transmission / reflection plate can be given. In such a liquid crystal display device, in the reflection mode, external light incident from the upper substrate side passes through the liquid crystal layer, is reflected by the reflective film inside the lower substrate, and passes through the liquid crystal layer again. It is emitted from the upper substrate side and contributes to display.
- the transmissive mode the light from the backlight incident from the lower substrate side passes through the liquid crystal layer through the window of the reflective film and is then emitted from the upper substrate side to contribute to display. Therefore, in the reflective film formation region, the region where the window is formed becomes the transmissive display region, and the other region becomes the reflective display region. [0004]
- the problem of light leakage in black display and a decrease in contrast has not been solved for a long time.
- Patent Document 1 JP-A-11 242226
- Patent Document 2 JP 2001-209065
- the present invention has been made to solve the above-described conventional problems, and the purpose thereof is to contribute to a reduction in thickness, to prevent heat unevenness, and to improve light leakage in black display.
- An object of the present invention is to provide an optical film that can be prevented, a simple and inexpensive manufacturing method thereof, and an image display device using such an optical film.
- the optical film of [0006] the present invention, the polarizer and, nx> ny a first light Science compensation layer having a refractive index profile of nz, nx> n y> second optical having a refractive index characteristic of nz
- An angle between the absorption axis of the polarizer and the slow axis of the first optical compensation layer is + 17 ° to + 27 ° or 17 ° to 27 °
- the angle formed between the absorption axis of the polarizer and the slow axis of the second optical compensation layer is + 85 ° to + 95 °
- the Nz coefficient of the second optical compensation layer is 1.2 ⁇ Nz ⁇ 2.
- the second optical compensation layer is formed of at least one polymer that is selected from the group force consisting of polyimide, polyamide, polyetherketone, polyamideimide, and polyesterimide. .
- the thickness of the second optical compensation layer is 1 ⁇ to 10 / ⁇ m.
- the second optical compensation layer is a ⁇ 4 plate.
- the first optical compensation layer includes at least one of a liquid crystal monomer and a liquid crystal polymer. In a preferred embodiment, the first optical compensation layer is a ⁇ 2 plate.
- the optical film of the present invention has an adhesive layer between the first optical compensation layer and the second optical compensation layer.
- an image display apparatus is provided.
- the image display device includes the optical film.
- a method for producing an optical film includes a step of performing an orientation treatment on the surface of the transparent protective film (T); a step of forming a first optical compensation layer on the surface of the transparent protective film (T) that has undergone the orientation treatment; A step of laminating a polarizer on the surface of the transparent protective film (T); and a step of forming a second optical compensation layer on the surface of the first optical compensation layer, the polarizer and the first Are arranged on opposite sides of each other with the transparent protective film (T) interposed therebetween, and the first optical compensation layer has a slow axis of the first optical compensation layer and an absorption axis of the polarizer.
- the second optical compensation layer is formed so that an angle between the second optical compensation layer and the polarizer is + 17 ° to + 27 ° or —17 ° to one 27 °. It is formed so that the angle formed with the absorption axis of + 85 ° to + 95 °.
- the step of forming the first optical compensation layer includes a step of applying a coating liquid containing a liquid crystal material, and the liquid crystal material comprises the applied liquid crystal material. Treating and orienting at a temperature exhibiting a liquid crystal phase.
- the liquid crystal material further includes a polymerizable monomer and Z or a crosslinkable monomer
- the alignment step of the liquid crystal material further includes performing a polymerization treatment and a Z or crosslinking treatment. Including.
- the polymerization treatment and Z or crosslinking treatment are performed by heating or light irradiation.
- the second optical compensation layer is formed so that its Nz coefficient is 1.2 ⁇ N z ⁇ 2.
- the step of forming the second optical compensation layer on the surface of the first optical compensation layer includes selecting a group force of polyimide, polyamide, polyetherketone, polyamideimide, and polyesterimide Applying a coating liquid containing at least one polymer to the surface of the base sheet; drying the coating liquid to form a polymer layer on the surface of the base sheet; and Heating and stretching together with the base sheet to form the second optical compensation layer on the base sheet; and the second optical compensation layer formed on the base sheet Adhering to the surface of the optical compensation layer; and Peeling from the second optical compensation layer.
- the polymer layer in the step of forming the second optical compensation layer on the base sheet, is stretched at a stretch ratio of 1.2 to 3 times together with the base sheet. In a more preferred embodiment, in the step of forming the second optical compensation layer on the base sheet, the polymer layer is stretched in the width direction together with the base sheet.
- a second optical compensation layer ⁇ ⁇ 4 plate
- the absorption axis of the polarizer and the respective slow phases of the first optical compensation layer and the second optical compensation layer are used.
- both the first optical compensation layer and the second optical compensation layer are very thin. Since it can be formed, it greatly contributes to the thinning of the image display device, and heat unevenness can be remarkably prevented.
- FIG. 1 is a schematic cross-sectional view of an optical film according to a preferred embodiment of the present invention.
- FIG. 2 is an exploded perspective view of an optical film according to a preferred embodiment of the present invention.
- FIG. 3 is a perspective view showing an outline of one process in an example of the method for producing an optical film of the present invention.
- FIG. 4 is a perspective view showing an outline of another process in an example of the method for producing an optical film of the present invention.
- FIG. 5 is a schematic diagram showing an outline of still another process in an example of the method for producing an optical film of the present invention.
- FIG. 6 is a schematic diagram showing an outline of still another process in an example of the method for producing an optical film of the present invention.
- FIG. 7 is a schematic view showing an outline of still another process in an example of the method for producing an optical film of the present invention.
- FIG. 8 is a schematic cross-sectional view of a liquid crystal panel used in a liquid crystal display device according to a preferred embodiment of the present invention.
- nx is the refractive index in the direction that maximizes the in-plane refractive index (ie, slow axis direction), and “ny” is the direction that is perpendicular to the slow axis in the plane (ie, fast phase). (Axial direction), and “nz” is the refractive index in the thickness direction.
- the term “substantially equal” is intended to include the case where V and range nx and ny differ from each other without practically affecting the overall optical characteristics of the optical film.
- In-plane retardation Re means the in-plane retardation value measured at 23 ° C with light at a wavelength of 590 nm.
- Re is the formula when the refractive index in the slow axis direction and the fast axis direction of the film (layer) at a wavelength of 590 nm is nx and ny, respectively, and d (nm) is the thickness of the film (layer):
- Re (nx—ny) X d
- Thickness direction retardation Rth is a thickness direction retardation value measured with light having a wavelength of 590 nm at 23 ° C.
- Rth is the refractive index in the slow axis direction and thickness direction of the film (layer) at a wavelength of 590 nm, respectively, nx and nz, and d (nm) is the thickness of the film (layer). nx-nz) Xd.
- Nz (nx ⁇ nz) / (nx ⁇ ny).
- ⁇ 2 plate refers to converting linearly polarized light having a specific vibration direction into linearly polarized light having a vibration direction orthogonal to the vibration direction of the linearly polarized light, or converting right circularly polarized light to left circularly polarized light. It has a function to convert light (or left circularly polarized light into right circularly polarized light).
- the ⁇ / 2 plate has a retardation value in the film (layer) plane of about 1Z2 with respect to the wavelength of light (usually in the visible light region).
- ⁇ 4 plate means a material having a function of converting linearly polarized light of a specific wavelength into circularly polarized light (or circularly polarized light into linearly polarized light).
- the ⁇ 4 plate has a retardation value in the film (layer) plane of about 1Z4 with respect to the wavelength of light (usually in the visible light region).
- FIG. 1 is a schematic cross-sectional view of an optical film according to a preferred embodiment of the present invention.
- FIG. 2 is an exploded perspective view for explaining the optical axis of each layer constituting the optical film of FIG.
- the optical film 10 includes a polarizer 11, a first optical compensation layer 13, and a second optical compensation layer 14 in this order.
- Each layer of the optical film is laminated via any appropriate pressure-sensitive adhesive layer or adhesive layer (not shown).
- any appropriate protective layer (transparent protective film) 15 is laminated on the side of the polarizer 11 where the optical compensation layer is not formed.
- any appropriate protective layer (transparent protective film) 12 may be provided between the polarizer 11 and the first optical compensation layer 13 as necessary.
- the second optical compensation layer 14 has a refractive index characteristic of nx>ny> nz and an Nz coefficient of 1.2 ⁇ Nz ⁇ 2. It is.
- the details of the first optical compensation layer and the second optical compensation layer will be described in the following sections A-2 and A-3, respectively.
- the first optical compensation layer 13 has a slow axis B that defines a predetermined angle oc with respect to the absorption axis A of the polarizer 11.
- the angle ⁇ is + 17 ° to + 27 ° or 17 ° to 27 ° with respect to the absorption axis A of the polarizer 11, preferably + 19 ° to + 25 ° or 19 ° to 25 °, More preferably, it is + 21 ° to + 24 ° or 21 ° to 1-24 °, and most preferably + 22 ° to + 23 ° or ⁇ 22 ° to ⁇ 23 °.
- the second optical compensation layer 14 is laminated such that the slow axis C defines a predetermined angle
- Angle j8 is + 85 ° to + 95 °, preferably + 87 ° to + 93 °, more preferably + 88 ° to + 92 ° with respect to absorption axis A of polarizer 11. Most preferably, it is + 89 ° to + 91 °.
- the total thickness of the optical film of the present invention is preferably 40 to 150 ⁇ m, more preferably 40 to 130 111, and most preferably 40 to L 00 m. According to the present invention, light leakage in the image display device can be satisfactorily prevented with only two optical compensation layers. Furthermore, according to the present invention, by forming the first optical compensation layer from a liquid crystal material (described later), the thickness for allowing the first optical compensation layer to function as a ⁇ 2 plate is remarkably compared with the conventional one.
- the second optical compensation layer can be made thin and formed by using a specific polymer material and a specific manufacturing method (to be described later) so that the second optical compensation layer can function as an 1 ⁇ 4 plate. The thickness can be made much thinner than before. As a result, the overall thickness of the optical film of the present invention can be remarkably reduced as compared with a conventional equivalent optical film, which can greatly contribute to the reduction in thickness of the image display device.
- the first optical compensation layer 13 can function as a ⁇ / 2 plate.
- the wavelength component of the second optical compensation layer that functions as a ⁇ ⁇ 4 plate For the dispersion characteristics (especially in the wavelength range where the phase difference deviates from ⁇ 4), the phase difference can be adjusted appropriately.
- the in-plane retardation Re of the first optical compensation layer is preferably 200 to 300 nm, more preferably 220 to 280 nm, and most preferably 230 to 270 nm.
- the thickness of the first optical compensation layer can be set so as to function most appropriately as a ⁇ 2 plate.
- the thickness can be set so as to obtain a desired in-plane retardation.
- the thickness is preferably 0.5 to 5 ⁇ m, more preferably 1 to 4 ⁇ m, and most preferably 1.5 to 3 m.
- any appropriate material can be adopted as long as the above characteristics are obtained.
- a liquid crystal material (nematic liquid crystal) in which the liquid crystal phase preferred by the liquid crystal material is a nematic phase is more preferred.
- the difference between nx and ny of the obtained optical compensation layer can be made much larger than that of a non-liquid crystal material.
- the thickness of the optical compensation layer for obtaining a desired in-plane retardation can be remarkably reduced.
- a liquid crystal material for example, a liquid crystal polymer or a liquid crystal monomer can be used.
- a liquid crystal polymer and a liquid crystal monomer may be used in combination.
- the liquid crystal material may have a liquid crystalline expression mechanism that may be either lyotropic or thermotropic pick.
- the alignment state of the liquid crystal is preferably homogenous alignment.
- the liquid crystal material is a liquid crystal monomer
- a polymerizable monomer or a crosslinkable monomer is preferable. This is because the alignment state of the liquid crystal material can be fixed by polymerizing or crosslinking a polymerizable monomer or a crosslinkable monomer, as will be described later. After aligning the liquid crystal monomer, for example, if the liquid crystal monomers (polymerizable monomer or crosslinkable monomer) are polymerized or cross-linked, the alignment state can be fixed accordingly.
- a polymer is formed by polymerization and a three-dimensional network structure is formed by crosslinking, but these are non-liquid crystalline.
- the first optical compensation layer for example, a transition to a liquid crystal phase, a glass phase, or a crystal phase due to a temperature change specific to the liquid crystal compound does not occur.
- the first optical compensation layer is an optical compensation layer that is not affected by temperature changes and has excellent stability.
- Polymerizable monomers and crosslinkable monomers may be used in combination.
- liquid crystal monomer any appropriate liquid crystal monomer can be adopted.
- 3 ⁇ 42002-533742 (WO00 / 37585), EP358208 (US5211877), EP6613 7 (US4388453), W093 / 22397, EP0261712, DE19504224, DE4408171, GB2280445, and the like can be used.
- Specific examples of such polymerizable mesogenic compounds include, for example, trade name LC242 from BASF, trade name E7 from Merck, and trade name LC-Sillicon-CC3767 from Wacker-Chem.
- liquid crystal monomer that are preferably nematic liquid crystal monomers include monomers represented by the following formula (L1). These liquid crystal monomers can be used alone or in combination of two or more.
- a 1 and A 2 each represent a polymerizable group, and may be the same or different.
- One of A 1 and A 2 may be hydrogen.
- -C represents an alkyl
- M represents a mesogenic group
- X may be the same or different, but is preferably the same.
- a 2 is preferably located in the ortho position with respect to A 1 .
- Sarako, A 1 and A 2 are each independently represented by the following formula:
- a 1 and A 2 are preferably the same group.
- Z represents a crosslinkable group
- X is as defined in the above formula (L1).
- Sp represents a linear or branched substituted or unsubstituted alkyl group having 1 to 30 carbon atoms
- n represents 0 or 1.
- the carbon chain in Sp may be interrupted by, for example, oxygen in the ether functional group, sulfur in the thioether functional group, a non-adjacent imino group, or a C to C alkylimino group.
- Z is an atomic group represented by the following formula.
- examples of R include groups such as methyl, ethyl, n-propyl, i-propyl, n-butyl, i-butyl, and t-butyl.
- M is preferably represented by the following formula (L3)! /.
- X is the same as defined in the above formula (L1).
- Q represents, for example, a substituted or unsubstituted linear or branched alkylene or aromatic hydrocarbon group.
- Q is, for example, a substituted or unsubstituted linear or branched C to C anolylene.
- Q is an aromatic hydrocarbon atomic group
- an atomic group represented by the following formula or a substituted analog thereof is preferable.
- Examples of the substituted analog of the aromatic hydrocarbon group represented by the above formula may include 1 to 4 substituents per aromatic ring, and the aromatic ring or You may have 1 or 2 substituents per group.
- the above substituents may be the same or different.
- Examples of the substituent include C to C alkyl, nitro, F, Cl, Br, and I.
- halogen such as, c-c alkoxy and the like.
- liquid crystal monomer examples include monomers represented by the following formulas (L4) to (L19).
- the temperature range in which the liquid crystal monomer exhibits liquid crystal properties varies depending on the type. Specifically, the temperature range is preferably 40 to 120 ° C, more preferably 50 to 100 ° C, and most preferably 60 to 90 ° C.
- the second optical compensation layer 14 has a refractive index characteristic of nx>ny> nz. That is, the second optical compensation layer 14 is a biaxial optical compensation layer. Preferably, the second optical compensation layer 14 is Can function as a ⁇ Z4 plate. In order to achieve sufficient visual compensation at all wavelengths, it is preferable that the wavelength dispersion of the second optical compensation layer exhibits the same wavelength dispersion as that of the liquid crystal in the liquid crystal cell. According to the present invention, the wavelength dispersion characteristic of the second optical compensation layer functioning as the ⁇ 4 plate is corrected by the optical characteristics of the first optical compensation layer functioning as the ⁇ 2 plate, thereby providing a wide wavelength range. The circular polarization function can be demonstrated.
- the in-plane retardation Re of the second optical compensation layer is preferably 90 to 160 nm.
- the thickness direction retardation Rth of the second optical compensation layer is preferably 80 to 150 nm.
- it is 90-140 nm, Most preferably, it is 100-130 nm.
- the Nz coefficient of the second optical compensation layer is 1.2 ⁇ Nz ⁇ 2, preferably 1.3 ⁇ Nz ⁇ 1.8, and more preferably 1.4 ⁇ Nz ⁇ l. 7.
- the second optical compensation layer functions as a ⁇ 4 plate, while performing optical compensation and axial compensation for the VA mode liquid crystal cell. The function can be exhibited and the contrast of the liquid crystal display device can be improved.
- the thickness of the second optical compensation layer can be set so as to function most appropriately as a ⁇ 4 plate.
- the thickness can be set so as to obtain a desired in-plane retardation.
- the thickness is preferably 1 to: LO / z m, more preferably 1.2 to 6, and most preferably 1.4 to 3 / ⁇ ⁇ . This thickness is much thinner than the thickness that can be achieved with a conventional biaxial ⁇ 4 plate. This can be realized by subjecting a specific polymer to a specific heating and stretching treatment by the production method of the present invention (details of the production method will be described in the section below).
- any appropriate material can be adopted as long as the above optical characteristics can be obtained.
- such materials include non-liquid crystalline materials.
- Particularly preferred are non-liquid crystalline polymers.
- Such a non-liquid crystalline material unlike the liquid crystalline material, can form a film exhibiting optical uniaxiality of nx> nz and ny> nz due to its own property that is related to the orientation of the substrate.
- not only oriented substrates but also unoriented substrates can be used.
- the step of applying an alignment film on the surface or the step of laminating the alignment film can be omitted.
- non-liquid crystalline polymer examples include polyamide, polyimide, polyester, polyetherketone, polyamideimide, polyesterimide, and the like because of excellent heat resistance, chemical resistance, transparency, and rigidity.
- Polymers are preferred. These polymers may be used either alone or as a mixture of two or more having different functional groups such as a mixture of polyaryletherketone and polyamide. Also good.
- polyimide is particularly preferable because of its high transparency, high orientation, and high stretchability. Since polyimide has high heat resistance and low thermal expansion, the second optical compensation layer formed from polyimide has little heat unevenness.
- the molecular weight of the polymer is not particularly limited.
- the weight average molecular weight (Mw) force i is in the range of 1,000 to 1,000,000 force S, more preferably 2,000 to 500, The range is 000.
- the polyimide for example, a polyimide soluble in an organic solvent having high in-plane orientation is preferable. Specifically, for example, it includes a condensation polymerization product of 9,9-bis (aminoaryl) fluorene and an aromatic tetracarboxylic dianhydride disclosed in JP 2000-511296 A, and has the following formula: A polymer containing one or more repeating units shown in (1) can be used.
- R 3 to R 6 are each independently hydrogen, halogen, phenyl group, a phenyl group substituted with 1 to 4 halogen atoms or a C alkyl group, and C
- Alkyl group power is at least one substituent selected.
- R 3 to R 6 are each independently a halogen, a phenyl group, 1 to 4 halogen atoms, or C A group substituted with an alkyl group, and a group power of c alkyl group selection 1 10 1-10
- At least one kind of substituent At least one kind of substituent.
- Z is, for example, a C 4 tetravalent aromatic group, preferably pyromellitic
- Z ′ represents, for example, a covalent bond, a C (R 7 ) group, a CO group, an O atom, an S atom, SO
- W is an integer from 1 to 10.
- Each R 7 is independently hydrogen or C (R 9 ).
- R 8 is hydrogen, an alkyl group having 1 to about 20 carbon atoms, or
- a C aryl group and in some cases, they may be the same or different.
- Each R 9 is independently hydrogen, fluorine, or chlorine.
- Examples of the polycyclic aromatic group include naphthalene, fluorene, benzofluorene, and an anthracene-induced tetravalent group.
- Examples of substituted derivatives of the polycyclic aromatic group include C alkyl group, fluorinated derivatives thereof, and F
- group power of halogen power such as C1 and the like, and the above polycyclic aromatic group substituted with at least one selected group.
- the polyimide etc. which are shown are mentioned.
- the polyimide of the following formula (5) is a preferred form of the homopolymer of the following formula (3).
- G and G ' each independently represent, for example, a covalent bond, a CH group, a C (CH) group, a C (CF) group, C (CX) A group (where X is a halogen), C
- the groups selected from the above may be the same or different.
- L is a substituent
- d and e represent the number of substitutions.
- L is, for example, halogen, C alkyl group, C halogenated alkyl group, phenyl group,
- substituted phenol group is a substituted phenol group, and when there are a plurality of them, they may be the same or different.
- substituted phenyl group include halogen, C alkyl group, and
- C has at least one kind of substituent which can also be selected as a group force that is also a halogenoalkyl group.
- halogen examples include fluorine, chlorine, bromine and iodine.
- d is an integer from 0 to 2 and e is from 0 to 3 Is an integer.
- Q is a substituent, and f represents the number of substitutions.
- Q include hydrogen, halogen, alkyl group, substituted alkyl group, nitro group, cyano group, thioalkyl group, alkoxy group, aryl group, substituted aryl group, alkyl ester group, and substituted alkyl ester group.
- the halogen include fluorine, chlorine, bromine and iodine.
- the substituted alkyl group include a halogenated alkyl group.
- the substituted aryl group include a halogenated aryl group.
- f is an integer from 0 to 4
- g is an integer from 0 to 3
- h is an integer from 1 to 3. In addition, g and h are greater than 1 and force S is preferable.
- R 1G and R 11 are each independently selected from the group consisting of hydrogen, halogen, a phenol group, a substituted phenyl group, an alkyl group, and a substituted alkyl group. It is a group. Among them, R 1G and R 11 are preferably each independently a halogenated alkyl group.
- M 1 and M 2 are each independently, for example, halogen, C alkyl
- halogen examples include fluorine, chlorine, bromine and iodine.
- substituted phenol group examples include halogen, C alkyl group, and C halogen.
- Examples thereof include a substituted phenyl group having at least one type of substituent selected from the group consisting of a 1-3-1 alkylated group.
- polyimide represented by the above formula (3) include those represented by the following formula (6).
- examples of the polyimide include a copolymer obtained by appropriately copolymerizing acid dianhydride diamin other than the skeleton (repeating unit) as described above.
- Examples of the acid dianhydride include aromatic tetracarboxylic dianhydrides.
- Examples of the aromatic tetracarboxylic dianhydride include pyromellitic dianhydride, benzophenone tetracarboxylic dianhydride, naphthalene tetracarboxylic dianhydride, and bicyclic aromatic tetracarboxylic dianhydride. And 2, 2'-substituted biphenyltetracarboxylic dianhydrides.
- Examples of the pyromellitic dianhydride include pyromellitic dianhydride, 3, 6-diphenyl-pyromellitic dianhydride, 3,6-bis (trifluoromethyl) pyromellitic acid dianhydride.
- benzophenone tetracarboxylic dianhydride examples include 3, 3 ′, 4, 4 ′ monobenzophenone tetracarboxylic dianhydride, 2, 3, 3 ′, 4 ′ monobenzo Examples include enonetetracarboxylic dianhydride and 2,2 ', 3,3'-benzophenonetetracarboxylic dianhydride.
- naphthalenetetracarboxylic dianhydride examples include 2, 3, 6, 7 naphthalene-tetracarboxylic dianhydride, 1, 2, 5, 6 naphthalene-tetracarboxylic dianhydride, 2, 6 dichloro- And naphthalene 1, 4, 5, 8-tetracarboxylic dianhydride.
- heterocyclic aromatic tetracarboxylic dianhydride include thiophene 2, 3, 4, 5-tetracarboxylic dianhydride, pyrazine 2, 3, 5, 6-tetracarboxylic dianhydride, pyridine. 2, 3, 5, 6-tetracarboxylic dianhydride and the like.
- Examples of the 2,2′-substituted biphenyltetracarboxylic dianhydride include, for example, 2,2, 1-dib-mouthed 4,4,5,5, -biphenyltetracarboxylic dianhydride, 2,2, -Dichloromethane-4, 4 ,, 5, 5,-Biphenyl tetracarboxylic dianhydride, 2, 2,-Bis (trifluoromethyl)-4, 4 ', 5, 5'-Biphenyl tetracarboxylic acid A dianhydride etc. are mentioned.
- aromatic tetracarboxylic dianhydride examples include 3, 3 ', 4, 4, -biphenyltetracarboxylic dianhydride, bis (2, 3 dicarboxyphenol) ) Methane dianhydride, bis (2, 5, 6 trifluoro-3,4 dicarboxyphenyl) Methane dianhydride, 2, 2 bis (3,4 dicarboxyphenyl) — 1, 1, 1, 3, 3, 3 Hexafluoropropyl Mouth Panni Anhydride, 4, 4'-Bis (3,4 Dicarboxyphenol)-2, 2 Diphenol Mouth panni anhydride, bis (3,4-dicarboxyphenyl) ether dianhydride, 4,4, oxydiphthalic dianhydride, bis (3,4-dicarboxyphenol) sulfonic dianhydride 3, 4, 3, 4-diphenylsulfonetetracarboxylic dianhydride, 4, 4, 1 [4, 4, 1-isopropylidene
- aromatic tetracarboxylic dianhydride 2,2'-substituted biphenyltetracarboxylic dianhydride is preferable, and 2,2'-bis (trihalomethyl) is more preferable.
- diamine examples include aromatic diamines, and specific examples include benzendiamine, diaminobenzophenone, naphthalenediamine, heterocyclic aromatic diamine, and other aromatic diamines. It is done.
- Examples of the benzene diamine include o-, m-, and p-phenylenediamine, 2,4 diaminotoluene, 1,4 diamine-2-methoxybenzene, 1,4 diamine-2-phenol benzene and 1, 3 Diamino 4 A group force consisting of benzene diamines such as black benzene.
- Examples of the above-mentioned diaminobenzophenone include 2,2, -diaminobenzofenone and 3,3-diaminobenzophenone.
- Examples of the naphthalenediamine include 1,8 diaminonaphthalene and 1,5-diaminonaphthalene.
- Examples of the heterocyclic aromatic diamine include 2,6 diaminopyridine, 2,4-diaminopyridine, 2,4 diamino-S triazine and the like.
- aromatic diamines include 4, 4, diaminobiphenyl, 4, 4, diaminodimethane, 4, 4,-(9 fluoroureidene) monodiyne, 2 , 2, 1 bis (trifluoromethyl) 4, 4'-diaminobiphenyl, 3, 3, 1 dichloro 1, 4, 4'- diaminodiphenyl methane, 2, 2'-dichloro-4, 4'-diaminobiphenyl, 2 , 2 ', 5, 5'-tetrachlorobenzidine, 2, 2 bis (4 aminophenoxyphenol) propane, 2, 2 bis (4 —Aminophenol) pronone, 2, 2 h, s (4 aminophenyl) 1, 1, 1, 3, 3, 3 hexafluoropropane, 4,4'-diaminodiphenyl ether, 3,4'-diaminodiphenyl ether, 1,3 bis (3 aminophenoxy) benzene, 1,3 bis (4 aminophenoxy
- polyether ketone examples include polyaryl ether ketones represented by the following general formula (7) described in JP-A-2001-49110.
- X represents a substituent, and q represents the number of substitutions.
- X is, for example, a halogen atom, a lower alkyl group, a halogenated alkyl group, a lower alkoxy group, or a halogeno-alkoxy group. When there are a plurality of Xs, they may be the same or different.
- halogen atom examples include a fluorine atom, a bromine atom, a chlorine atom, and an iodine atom, and among these, a fluorine atom is preferable.
- a fluorine atom is preferable.
- the lower alkyl group for example, a C linear or branched alkyl group is more preferable.
- the group, propyl group, isopropyl group, butyl group, isobutyl group, sec butyl group and tert butyl group are preferred, and methyl group and ethyl group are particularly preferred.
- the halogenated alkyl group include halogenated compounds of the lower alkyl group such as a trifluoromethyl group.
- the lower alkoxy group include a C straight chain. Or a branched alkoxy group is preferred, more preferably a C straight or branched chain.
- An alkoxy group Specifically, a methoxy group, an ethoxy group, a propoxy group, an isopropoxy group, a butoxy group, an isobutoxy group, a sec-butoxy group, and a tert-butoxy group are more preferable, particularly preferably a methoxy group and an ethoxy group.
- the halogenated alkoxy group include a halogenated product of the lower alkoxy group such as a trifluoromethoxy group.
- the carbocycle group bonded to both ends of the benzene ring and the oxygen atom of the ether exist in the para position with respect to each other.
- R 1 is a group represented by the following formula (8), and m is an integer of 0 or 1.
- X ′ represents a substituent, and is the same as X in the above formula (7), for example.
- R 2 represents a divalent aromatic group.
- the divalent aromatic group include o-, m- or p-phenylene diene group, or naphthalene, biphenyl, anthracene, o mono, m- or p-terphenyl, phenanthrene, dibenzofuran, biphenol.
- -Diethyl or bivalent sulfone force induced divalent groups may be substituted with a hydrogen-powered halogen atom, lower alkyl group or lower alkoxy group directly bonded to the aromatic group.
- the following formulas (9) to (15) are preferable aromatic groups in which the group force is selected.
- R 1 is preferably a group represented by the following formula (16).
- R 2 and p are as defined in the above formula (8). It is.
- n represents the degree of polymerization and is, for example, in the range of 2 to 5000, and preferably in the range of 5 to 500.
- the polymerization may be a repeating unit force having the same structure or a repeating unit force having a different structure. In the latter case, the polymerization mode of the repeating unit may be block polymerization or random polymerization.
- the terminal of the polyaryletherketone represented by the formula (7) is fluorine on the p-tetrafluorobenzobenzene group side and a hydrogen atom on the oxyalkylene group side.
- Such polyaryletherketone can be represented, for example, by the following general formula (17). In the formula below, n represents the same degree of polymerization as in formula (7) above. [0092] [Chemical 17]
- polyaryletherketone represented by the above formula (7) include those represented by the following formulas (18) to (21). In each of the following formulas, n represents the above formula. Degree of polymerization similar to (7).
- polyamide or polyester examples include polyamides and polyesters described in JP-T-10-508048, and the repeating unit thereof is, for example, the following general unit It can be represented by formula (22).
- Y is O or NH.
- E is, for example, a covalent bond, C al
- R represents a C alkyl group and a C halogenated alkyl.
- A represents, for example, hydrogen, halogen, C alkyl group, C halogenated alkyl group
- a ′ is, for example, a halogen, a C alkyl group, a C halogenated alkyl group, a phenol group, and a substituted phenol.
- the t is an integer from 0 to 4, and the z is an integer from 0 to 3.
- repeating units of polyamide or polyester represented by the above formula (22) those represented by the following general formula (23) are preferred.
- a A ′ and Y are as defined in the above formula (22), and v is an integer of 0 to 3, preferably an integer of 0 to 2.
- X and y are 0 or 1, respectively.
- any appropriate polarizer may be adopted as the polarizer 11 depending on the purpose.
- a hydrophilic polymer film such as a polybulal alcohol film, a partially formalized polybulal alcohol film, or an ethylene / acetic acid copolymer copolymer ken-yi film is used for two colors such as iodine or a dichroic dye.
- examples include polyaxially oriented films such as those obtained by adsorbing volatile substances and uniaxially stretched, polyvinyl alcohol dehydrated products and polyvinyl chloride dehydrochlorinated products.
- a uniaxially stretched polarizer obtained by adsorbing a dichroic substance such as iodine on a polybulualcohol-based film is particularly preferred because of its high polarization dichroic ratio.
- the thickness of these polarizers is not particularly limited, but is generally about 180 / ⁇ ⁇ .
- a polarizer uniaxially stretched by adsorbing iodine to a polybulualcohol-based film is dyed by, for example, immersing polyvinyl alcohol in an aqueous solution of iodine. It can be produced by stretching 3 to 7 times. If necessary, it may contain boric acid, zinc sulfate, zinc chloride or the like, or may be immersed in an aqueous solution of potassium iodide or the like. Furthermore, if necessary, the polybulal alcohol film may be immersed in water and washed before dyeing.
- washing the polybulualcohol film with water not only cleans the surface of the polybulcoalcohol film and the anti-blocking agent, but also swells the polybulualcohol film, causing unevenness in the staining. There is also an effect to prevent.
- the stretching may be performed after dyeing with iodine, may be performed while dyeing, or may be stretched and dyed with strong iodine. It can be stretched in an aqueous solution of boric acid or potassium iodide or in a water bath.
- any appropriate film that can be used as a protective layer of a polarizing plate can be adopted.
- a transparent protective film is preferred.
- materials that are the main components of such films include cellulose-based resins such as triacetyl cellulose (TAC), polyester-based, polybutyl alcohol-based, polycarbonate-based, polyamide-based, polyimide-based, polyethersulfone.
- TAC triacetyl cellulose
- polyester-based such as triacetyl cellulose (TAC)
- polybutyl alcohol-based such as polycarbonate-based, polyamide-based, polyimide-based, polyethersulfone.
- transparent resins such as polysulfone, polysulfone, polystyrene, polynorbornene, polyolefin, acrylic, and acetate.
- acrylic, urethane, acrylic urethane, epoxy and silicone thermosetting resins or ultraviolet curable resins are also included.
- a glassy polymer such as a siloxane polymer may be used.
- the polymer film described in JP 2001-343529 A (WO01Z37007) can also be used.
- the material of the film include thermoplastic resin having a substituted or unsubstituted imide group in the side chain, and a thermoplastic resin having a substituted or unsubstituted phenyl group and -tolyl group in the side chain.
- the resin composition can be used, for example, a resin composition having an alternating copolymer of isobutene and N-methylmaleimide and an acrylonitrile / styrene copolymer.
- the polymer film can be, for example, an extrusion-molded product of the resin composition.
- TAC which is preferable to TAC, polyimide-based resin, polybutyl alcohol-based resin, and glassy polymer, is more preferable.
- the protective layer is preferably transparent and has no color.
- the retardation value Rth force in the thickness direction is preferably 1 to 90 nm, more preferably 1 to 80 nm, and most preferably 70 to +70 nm.
- the thickness of the protective layer any appropriate thickness can be adopted as long as the above preferred thickness direction retardation is obtained.
- the thickness of the protective layer is preferably 5 mm or less, more preferably 1 mm or less, particularly preferably 1 to 500 / z m, and most preferably 5 to 150 ⁇ m.
- the protective layers 12 and 15 may be the same or different.
- the protective layer 15 can be subjected to a hard coat treatment, an antireflection treatment, an anti-sticking treatment, an antiglare treatment, or the like as necessary.
- the optical film of the present invention may further include another optical layer.
- another optical layer any appropriate optical layer can be adopted depending on the purpose and the type of the image display device. Specific examples include a liquid crystal film, a light scattering film, a diffraction film, and another optical compensation layer (retardation film).
- the optical film of the present invention may further have a pressure-sensitive adhesive layer or an adhesive layer as an outermost layer on at least one side.
- a pressure-sensitive adhesive layer or an adhesive layer as an outermost layer in this manner, for example, lamination with other members (for example, liquid crystal cells) is facilitated, and the optical film of the present invention has other member forces. It can prevent peeling.
- Any appropriate material can be adopted as a material for forming the pressure-sensitive adhesive layer and the adhesive layer.
- a material excellent in hygroscopicity and heat resistance is used. This is because it is possible to prevent foaming and peeling due to moisture absorption, deterioration of optical characteristics due to thermal expansion differences, and warpage of the liquid crystal cell.
- the surface of the pressure-sensitive adhesive layer or the adhesive layer can be covered with any appropriate separator until the optical film of the present invention is actually used to prevent contamination.
- the separator can be formed by, for example, a method of providing a release coat with a release agent such as a silicone-based, long-chain alkyl-based, fluorine-based, molybdenum sulfide, or the like on any appropriate film.
- Each layer in the optical film of the present invention includes, for example, a salicylic acid ester compound, UV-absorbing ability may be imparted by treatment with an ultraviolet absorber such as a nzophenone compound, a benzotriazole compound, a cyanoacrylate compound, or a nickel complex compound.
- an ultraviolet absorber such as a nzophenone compound, a benzotriazole compound, a cyanoacrylate compound, or a nickel complex compound.
- the method for producing an optical film of the present invention includes a step of subjecting the surface of the transparent protective film (T) 12 (which finally becomes a protective layer) to orientation treatment; and performing the orientation treatment of the transparent protective film (T). Forming a first optical compensation layer 13 on the surface; laminating a polarizer 11 on the surface of the transparent protective film (T); and a second optical compensation layer 14 on the surface of the first optical compensation layer Forming the step.
- the polarizer and the first optical compensation layer are disposed on opposite sides of each other via the transparent protective film (T).
- the first optical compensation layer 13 has an angle between the slow axis of the first optical compensation layer and the absorption axis of the polarizer of + 17 ° to + 27 ° or 17 °.
- the second optical compensation layer 14 is formed so that the angle between the slow axis of the second optical compensation layer and the absorption axis of the polarizer is + 85 ° to +95. It is formed to be According to such a manufacturing method, for example, an optical film as shown in FIGS. 1 and 2 can be obtained. The order of the above steps and the film to be subjected to Z or orientation treatment can be appropriately changed according to the purpose.
- the polarizer laminating step may be performed after any optical compensation layer forming step or laminating step.
- the orientation treatment may be performed on the transparent protective film, or may be performed on any appropriate base material.
- the film specifically, the first optical compensation layer formed on the substrate is transferred in an appropriate order according to the desired laminated structure of the optical film. (Laminated). The details of each process will be described below.
- the first optical compensation layer 13 having the slow axis B that forms an angle ⁇ with respect to the absorption axis of the polarizer 11 can be formed (the step of forming the first optical compensation layer will be described later).
- any appropriate orientation treatment is adopted. Can be done. Specific examples include rubbing treatment, oblique vapor deposition method, stretching treatment, photo-alignment treatment, magnetic field orientation treatment, and electric field orientation treatment. A rubbing process is preferred. In addition, arbitrary appropriate conditions can be adopted as the processing conditions for the various alignment processes depending on the purpose.
- the orientation direction of the orientation treatment is a direction that forms a predetermined angle with the absorption axis of the polarizer when the transparent protective film (T) and the polarizer are laminated. As will be described later, this orientation direction is substantially the same as the direction of the slow axis B of the first optical compensation layer 13 to be formed. Therefore, the predetermined angle is + 17 ° to + 27 ° or ⁇ 17 ° to 27 °, preferably + 19 ° to + 25 ° or 19 ° to 25 °, and Preferably + 21 ° to + 24 ° or 21 ° to 1-24 °, most preferably + 22 ° to + 23 ° or 22. ⁇ One 23 °.
- the treatment is performed in the longitudinal direction of the long transparent protective film (T),
- the long transparent protective film (T) should be processed in the longitudinal direction or in an oblique direction (specifically, a direction defining a predetermined angle as described above) with respect to the vertical direction (width direction).
- the polarizer is produced by stretching a polymer film dyed with a dichroic substance as described above, and has an absorption axis in the stretching direction. When mass-producing a polarizer, a long polymer film is prepared and continuously stretched in the longitudinal direction.
- the longitudinal direction of both is the absorption axis of the polarizer.
- the orientation treatment may be any suitable orientation layer that may be applied directly to the surface of the transparent protective film (T).
- T transparent protective film
- a polyimide layer, a polybutyl alcohol layer, a silane coupling layer, etc. may be formed and applied to the alignment layer.
- the rubbing treatment is preferably performed directly on the surface of the transparent protective film.
- the alignment layer is a polyimide layer
- the solvent does not erode the transparent protective film; Therefore, it is difficult to select a solvent for the alignment layer forming composition; (2) Curing at a high temperature (for example, 150 to 300 ° C) is required, so that the obtained elliptically polarized light can be obtained. An appearance defect may occur on the plate.
- the alignment layer is a polyvinyl alcohol layer
- the heat resistance and moisture resistance of the alignment layer are insufficient, so that the transparent protective film and the alignment layer may peel off under high temperature and high humidity. As a result, white blur may occur.
- the alignment layer is a silane coupling agent layer, the formed liquid crystal layer (first optical compensation layer) is inclined and it is difficult to realize desired positive uniaxiality immediately. There is.
- a coating liquid containing the liquid crystal material as described in the above section A-2 is applied to the surface of the transparent protective film (T) subjected to the alignment treatment, and the liquid crystal material is then aligned in the following manner.
- a first optical compensation layer is formed. Specifically, a coating liquid in which a liquid crystal material is dissolved or dispersed in an appropriate solvent is prepared, and this coating liquid is applied to the transparent protective film (T) surface that has been subjected to the above-described orientation treatment. .
- the alignment process of the liquid crystal material will be described in Section B-3 below.
- any suitable solvent capable of dissolving or dispersing the liquid crystal material may be employed.
- the type of solvent used can be appropriately selected according to the type of liquid crystal material.
- Specific examples of the solvent include halogenated hydrocarbons such as chloroform, formaldehyde, dichloromethane, carbon tetrachloride, dichloroethane, tetrachloroethane, methylene chloride, trichloroethylene, tetrachloroethylene, chloroform, benzene, orthodichlorobenzene, phenol, p Phenolics such as chlorophenol, o black mouth phenol, m-cresol, o cresol, p cresol monole, aromatic hydrocarbons such as benzene, toluene, xylene, mesitylene, methoxybenzene, 1,2-dimethoxybenzene, acetone , Ketone solvents such as methyl ethyl ketone (MEK), me
- solvents such as dimethylformamide, amide solvents such as dimethylacetamide, acetonitrile solvents, -tolyl solvents such as butyl-tolyl, ether solvents
- solvents can be used alone or in combination of two or more.
- the content of the liquid crystal material in the coating liquid can be appropriately set according to the type of the liquid crystal material, the thickness of the target layer, and the like. Specifically, the content of the liquid crystal material is preferably 5 to 50% by weight, more preferably 10 to 40% by weight, and most preferably 15 to 30% by weight.
- the coating solution may further contain any appropriate additive as required.
- the additive include a polymerization initiator and a crosslinking agent. These are particularly preferably used when a liquid crystal monomer (polymerizable monomer or crosslinkable monomer) is used as the liquid crystal material.
- the polymerization agent include benzoyl peroxide (BPO) and azobisisobutyl-tolyl (AIBN).
- the crosslinking agent include isocyanate crosslinking agents, epoxy crosslinking agents, metal chelate crosslinking agents and the like. These can be used alone or in combination of two or more.
- additives include anti-aging agents, modifiers, surfactants, dyes, pigments, anti-discoloring agents, and ultraviolet absorbers. These can also be used alone or in combination of two or more.
- antiaging agent include phenolic compounds, amine compounds, organic sulfur compounds, and phosphine compounds.
- the modifier include glycols, silicones, and alcohols.
- the surfactant is used, for example, to smooth the surface of an optical film. , Acrylic-based and fluorine-based surfactants.
- the coating amount of the coating liquid can be appropriately set according to the concentration of the coating liquid, the thickness of the target layer, and the like.
- the coating amount is preferably 0.03-0.17 ml per area (100 cm 2 ) of the transparent protective film, and more preferably. It is preferably 0.05 to 0.15 ml, most preferably 0.08 to 0.12 ml.
- any appropriate method may be adopted as the coating method. Specific examples include a roll coat method, a spin coat method, a wire bar coat method, a dip coat method, an etching method, a curtain coat method, and a spray coat method.
- the liquid crystal material for forming the first optical compensation layer is oriented according to the orientation direction of the surface of the transparent protective film (T).
- the alignment of the liquid crystal material is performed by processing at a temperature showing a liquid crystal phase according to the type of the liquid crystal material used. By performing such temperature treatment, the liquid crystal material takes a liquid crystal state, and the liquid crystal material is aligned according to the alignment direction of the surface of the transparent protective film (T). As a result, birefringence occurs in the layer formed by coating, and the first optical compensation layer is formed.
- the treatment temperature can be appropriately determined according to the type of the liquid crystal material.
- the treatment temperature is preferably 40 to 120 ° C, more preferably 50 to 100 ° C, and most preferably 60 to 90 ° C.
- the treatment time is preferably 30 seconds or longer, more preferably 1 minute or longer, particularly preferably 2 minutes or longer, and most preferably 4 minutes or longer. If the treatment time is less than 30 seconds, the liquid crystal material may not take a sufficient liquid crystal state.
- the treatment time is preferably 10 minutes or less, more preferably 8 minutes or less, and most preferably 7 minutes or less. If the treatment time exceeds 10 minutes, the additive may sublime.
- the layer formed by the coating is further polymerized. It is preferable to perform a treatment or a crosslinking treatment. By performing the polymerization treatment, the liquid crystal monomer is polymerized, and the liquid crystal monomer is fixed as a repeating unit of the polymer molecule. The liquid crystal monomer forms a three-dimensional network structure by crosslinking treatment. The liquid crystal monomer is fixed as a part of the cross-linked structure. As a result, the alignment state of the liquid crystal material is fixed.
- the polymer or three-dimensional network structure formed by polymerizing or crosslinking the liquid crystal monomer is “non-liquid crystalline”. Therefore, in the formed first optical compensation layer, for example, a transition to a liquid crystal phase, a glass phase, or a crystal phase due to a temperature change peculiar to liquid crystal molecules does not occur. As a result, it is possible to obtain the first optical compensation layer having very excellent stability that is not affected by temperature.
- the specific procedure for the polymerization treatment or the crosslinking treatment can be appropriately selected depending on the kind of the polymerization initiator and the crosslinking agent to be used.
- a photopolymerization initiator or a photocrosslinking agent an ultraviolet polymerization initiator that is irradiated with light or when an ultraviolet crosslinking agent is used, a polymerization initiator by heat that is irradiated with ultraviolet light or When a cross-linking agent is used, heating may be performed.
- Light or ultraviolet irradiation time, irradiation intensity, total irradiation amount, etc. depend on the type of liquid crystal material, the type of transparent protective film (T), the type of alignment treatment, the characteristics desired for the first optical compensation layer, etc. Can be set appropriately.
- the heating temperature, the heating time, and the like can be set as appropriate.
- the liquid crystal material is aligned in accordance with the alignment direction of the transparent protective film (T). Therefore, the slow axis B of the formed first optical compensation layer is The orientation direction of the transparent protective film (T) is substantially the same. Therefore, the direction of the slow axis B of the first optical compensation layer is + 17 ° to + 27 ° or 17 ° to 27 °, preferably +19 to the longitudinal direction of the transparent protective film (T). ° to + 25 ° or 19 ° to 1-25 °, more preferably + 21 ° to + 24 ° or 21 ° to 1-24 °, most preferably + 22 ° to + 23 ° or 22 ° to 123 ° .
- a polarizer is laminated on the surface of the transparent protective film (T).
- the lamination of the polarizer can be performed at any appropriate point in the production method of the present invention.
- a polarizer may be laminated on the transparent protective film (T) in advance, and after the formation of the first optical compensation layer, the second optical compensation layer may be laminated. May be.
- the polarizer and the first optical compensation layer are disposed on opposite sides of each other with the transparent protective film (T) interposed therebetween.
- any suitable laminating method may be used. (Eg, gluing) can be employed. Adhesion can be performed using any suitable adhesive or adhesive.
- the type of adhesive or pressure-sensitive adhesive can be appropriately selected depending on the type of adherend (that is, the transparent protective film and the polarizer).
- Specific examples of the adhesive include polymer adhesives such as allylic, vinyl alcohol, silicone, polyester, polyurethane, and polyether, isocyanate adhesives, rubber adhesives, and the like.
- Specific examples of the pressure-sensitive adhesive include acrylic-based, butyl alcohol-based, silicone-based, polyester-based, polyurethane-based, polyether-based, isocyanate-based and rubber-based pressure-sensitive adhesives.
- the thickness of the adhesive or pressure-sensitive adhesive is not particularly limited, but is preferably 10 to 200 nm, more preferably 30 to 180 nm, and most preferably 50 to 150 nm.
- the slow axis of the first optical compensation layer can be set in the alignment treatment of the transparent protective film, so that the film is stretched in the longitudinal direction (that is, absorbed in the longitudinal direction).
- a long polarizing film (with a shaft) can be used.
- a long transparent protective film that has been aligned to form a predetermined angle with respect to the longitudinal direction and a long polarizing film (polarizer) are aligned in the longitudinal direction (so-called mouth-opening). Can be pasted together in a continuous manner. Therefore, an optical film can be obtained with very good production efficiency.
- the direction of the absorption axis of the polarizer is substantially parallel to the longitudinal direction of the long film.
- substantially parallel means that the angle between the longitudinal direction and the absorption axis direction includes 0 °, 10 °, preferably 0 ° ⁇ 5 °, more preferably 0 °. ⁇ 3 °.
- a second optical compensation layer is formed on the surface of the first optical compensation layer.
- the detailed procedure of the formation process of the second optical compensation layer is as follows.
- the second optical compensation layer A coating liquid containing a material to be formed (specifically, a non-liquid crystal material as described in the above section A-3; hereinafter also referred to as an optical compensation layer forming material) is applied to the base sheet. Any appropriate method can be adopted as the coating method. Specific examples of the coating method include spin coating method, roll coating method, flow coating method, printing method, dip coating method, cast film forming method, bar coating method, and gravure printing method.
- the concentration of the optical compensation layer forming material in the coating solution of the optical compensation layer forming material is
- the coating liquid preferably contains 5 to 50 parts by weight, more preferably 10 to 40 parts by weight of the optical compensation layer forming material with respect to 100 parts by weight of the solvent.
- a coating solution having such a concentration range has a viscosity that allows easy coating.
- the solvent used in the coating liquid for the optical compensation layer forming material can be appropriately selected according to the type of the optical compensation layer forming material. Specific examples of solvents that can be used include the solvents described in Section B-2 above.
- the coating solution may further contain various additives such as stabilizers, plasticizers, metals and the like as necessary.
- the coating amount of the coating liquid is adjusted so that the second optical compensation layer can function properly as a ⁇ 4 plate (that is, the thickness described in the above item 3-3). It is adjusted.
- the coating liquid for the optical compensation layer forming material may further contain a resin different from the optical compensation layer forming material as long as the optical properties of the obtained optical compensation layer are appropriate.
- a resin include various general-purpose resins, engineering plastics, thermoplastic resins, and thermosetting resins. By using such a resin together, it is possible to form an optical compensation layer having appropriate mechanical strength and durability depending on the purpose.
- the base material sheet any appropriate base material sheet is used as long as the appropriate second optical compensation layer in the present invention is obtained.
- the base sheet is made of a polyester polymer such as polyethylene terephthalate or polyethylene naphthalate, a cellulose polymer such as diacetyl cellulose or triacetyl cellulose, an acrylic polymer such as a polycarbonate polymer, or polymethyl methacrylate.
- Polymers polystyrene, acrylo-tolyl, styrene copolymers such as styrene copolymers, polyethylene, polypropylene , Polyolefins having a cyclic or norbornene structure, olefin polymers such as ethylene'propylene copolymer, salt bismuth polymers, amide polymers such as nylon and aromatic polyamide, imide polymers, snorephone polymers, polyetherolene Snorephone polymer, Polyetherolene ketone ketone polymer, Polyphenylene sulfide polymer, Bull alcohol polymer, Vinylidene chloride polymer, Vinyl butyral polymer, Arylate polymer, Polyoxymethylene polymer, Epoxy Polymers and their blending forces are also formed.
- the base sheet can be subjected to stretching treatment, recrystallization treatment, and the like.
- the thickness of the base sheet is preferably 20 to: LOO ⁇ m, more preferably 30 to 90 ⁇ m, most preferably 30
- the strength to favorably support the very thin second optical compensation layer in the transfer process (described later) is provided, and the operability such as slipping property and roll running property is also provided. Maintained properly.
- the coating film of the solution of the optical compensation layer forming material formed on the base sheet is dried to form a polymer layer (the polymer layer is finally the second optical compensation layer). 14).
- Any appropriate method for example, natural drying, heat drying, air drying may be employed as the drying method.
- the drying temperature can vary depending on the type of optical compensation layer forming material, the type of solvent, the optical characteristics of the target optical compensation layer, and the like.
- the drying temperature is preferably 20 to 400 ° C, more preferably 60 to 300 ° C, and most preferably 65 to 250 ° C.
- the drying time is preferably 0.5 to 200 minutes, more preferably 1 to 120 minutes, and most preferably 5 to: LOO minutes. Drying may be performed at a constant temperature or by changing the temperature continuously or stepwise.
- the obtained polymer layer is heated and stretched together with the base sheet (ie, the polymer layer and the base sheet together) to form a second optical compensation layer on the base sheet.
- Any appropriate method for example, fixed end stretching or free end stretching
- the draw ratio is preferably 1.2 to 3.0 times, more preferably 1.3 to 2.9 times, and most preferably 1. to the total length of the polymer layer and the base sheet before stretching. 3 to 2.8 times.
- the stretching temperature is preferably 120 to 200 ° C, more preferably 130 to 19 0 ° C, most preferably 135-180 ° C.
- the stretching direction can be set according to the direction of the slow axis desired for the second optical compensation layer.
- the slow axis of the first optical compensation layer can be set to an arbitrary oblique direction with respect to the absorption axis of the polarizer (the longitudinal direction of the long film).
- the slow axis of the first optical compensation layer is set to + 22 ° to + 23 ° or 22 ° to 23 ° with respect to the absorption axis of the polarizer
- the slow phase of the second optical compensation layer is set. It was obvious that the axis should be substantially perpendicular to the absorption axis of the polarizer.
- the stretching of the polymer layer and the base sheet is performed in the lateral direction (width direction: direction orthogonal to the longitudinal direction: direction orthogonal to the absorption axis of the polarizer).
- the second optical compensation layer formed on the base sheet is transferred to the surface of the first optical compensation layer.
- the transfer method is not particularly limited.
- the transfer is performed by bonding the second optical compensation layer supported on the base sheet to the first optical compensation layer via an adhesive.
- a typical example of the adhesive is a curable adhesive.
- the curable adhesive include a photocurable adhesive such as an ultraviolet curable adhesive, a moisture curable adhesive, and a thermosetting adhesive.
- the thermosetting adhesive include thermosetting resin adhesives such as epoxy resin, isocyanate resin, and polyimide resin.
- Specific examples of the moisture curable adhesive include isocyanate-based moisture curable adhesives. Moisture curable adhesives (especially isocyanate-based moisture curable adhesives) are preferred.
- Moisture curable adhesives cure by reacting with moisture in the air, adsorbed water on the adherend surface, active hydrogen groups such as hydroxyl groups and carboxyl groups, etc., so leave them after applying the adhesive. Can be cured naturally, and is excellent in operability. Furthermore, since it is not necessary to heat for curing, the first and second optical compensation layers are not heated at the time of bonding (adhesion). As a result, there is no concern about heat shrinkage, so that cracks and the like during stacking are significantly prevented even when the first and second optical compensation layers are extremely thin as in the present invention. Can be done.
- the isocyanate resin-based adhesive is a general term for polyisocyanate-based adhesives and polyurethane resin adhesives.
- the curable adhesive is, for example, a curable resin adhesive solution (or dispersion) obtained by dissolving or dispersing the above-mentioned various curable resins in a solvent using a commercially available adhesive. It may be prepared as When preparing a solution (or dispersion), the content of the curable resin in the solution is preferably from 10 to 80% by weight, more preferably from 20 to 65% by weight of solid content, Preferably it is 25 to 65% by weight, most preferably 30 to 50% by weight.
- a solvent to be used any appropriate solvent can be adopted depending on the type of curable resin. Specific examples include ethyl acetate, methyl ethyl ketone, methyl isobutyl ketone, toluene, xylene and the like. These may be used alone or in combination of two or more.
- the coating amount of the adhesive may be appropriately set according to the purpose.
- the coating amount is preferably 0.3 to 3 ml, more preferably 0.5 to 2 ml, most preferably 1 to 2 ml per area (cm 2 ) of the first or second optical compensation layer.
- the solvent contained in the adhesive is volatilized by natural drying or heat drying as necessary.
- the thickness of the adhesive layer thus obtained is preferably 0.1 / ⁇ ⁇ to 20 / ⁇ ⁇ , more preferably 0.5 ⁇ m to 15 m, most preferably 1 ⁇ m to 10 m. .
- the indentation hardness (microhardness) of the adhesive layer is preferably 0.1 to 0.5 GPa, more preferably 0.2 to 0.5 GPa, and most preferably 0.3 to 0.4 GPa. .
- the indentation hardness can be converted to the Vickers hardness because the correlation with the Pickers hardness is known.
- the indentation hardness can be calculated from the indentation depth and indentation load using, for example, a thin film hardness tester manufactured by NEC Corporation (NEC) (for example, trade name MH4000, trade name MHA-400). Monkey.
- FIGS. 3 to 7 are the rolls for winding the film forming the respective layers and the ridges or laminates, with reference numerals 111, 111 ′, 112, 112 ′, 115, 116 ⁇ .
- a long polymer film as a raw material for a polarizer is prepared, and dyeing, stretching, and the like are performed as described in Section IV-4 above. Stretching is performed continuously in the longitudinal direction of a long polymer film. As a result, as shown in the perspective view of FIG. 3, a long polarizer 11 having an absorption axis in the longitudinal direction (stretching direction: arrow ⁇ direction) is obtained.
- a long transparent protective film 12 (which finally becomes a protective layer) is prepared, and one surface thereof is rubbed with a labin roll 120. .
- the rubbing direction is set to a direction different from the longitudinal direction of the transparent protective film 12, for example, ⁇ 22.5 °.
- the first optical compensation layer 13 is formed on the transparent protective film 12 subjected to the rubbing treatment as described in the above B-2 and B-3. Form.
- the liquid crystal material is oriented along the rubbing direction, so the slow axis direction is substantially the same direction (arrow B direction) as the rubbing direction of the transparent protective film 12. .
- a long second transparent protective film (second protective layer) 15, a long polarizer 11, and a transparent protective film (protective layer) 12 The laminated body 121 of the first optical compensation layer 13 is sent out in the direction of the arrow, and bonded together with an adhesive or the like (not shown) in a state where the respective longitudinal directions are aligned. Thereby, the laminated body 123 (the second protective layer 15, the polarizer 11, the protective layer 12, and the first optical compensation layer 13) is obtained.
- reference numeral 122 denotes a guide roll for bonding the films together (the same applies to FIGS. 6 and 7).
- a long laminate 125 (with the second optical compensation layer 14 supported on the base sheet 26) is prepared and laminated with this.
- the body 123 (second protective layer 15, polarizer 11, protective layer 12 and first optical compensation layer 13) is sent out in the direction of the arrow, and the adhesive and the like (Fig. (Not shown).
- a long polarizer 11 is manufactured.
- a long transparent protective film (which eventually becomes a protective layer) 12 is prepared, and one surface thereof is rubbed with a labinda roll 120. Go.
- the rubbing direction is a direction having a predetermined angle with respect to the longitudinal direction of the transparent protective film 12 (arrow B direction), for example, ⁇ 22.5 °.
- a long second transparent protective film (second protective layer) 15, a long polarizer 11 and a long transparent protective film (protective layer) 12 are sent out in the direction of the arrows, and bonded together with an adhesive or the like (not shown) with their respective longitudinal directions aligned.
- the transparent protective film 12 that has been subjected to the rubbing treatment is sent out so that the side opposite to the surface that has undergone the rubbing treatment faces the polarizer 11.
- a laminate 124 of the second protective layer (second transparent protective film) 15Z polarizer 11Z protective layer (transparent protective film) 12 is obtained.
- the first optical compensation layer 13 is formed on the protective layer (transparent protective film 12) subjected to the rubbing treatment as described in the above section B-2 and B-3.
- the liquid crystal material is aligned along the rubbing direction, so that the slow axis direction is substantially the same direction (arrow B direction) as the rubbing direction of the transparent protective film 12.
- the laminate 123 (second protective layer 15, polarizer 11, protective layer 12, and first optical compensation layer 13) is obtained.
- a long laminate 125 (with the second optical compensation layer 14 supported on the base sheet 26) was prepared and laminated with this.
- the body 123 (second protective layer 15, polarizer 11, protective layer 12, and first optical compensation layer 13) is sent out in the direction of the arrow, and adhesives etc. (Not shown).
- the substrate sheet 26 is peeled off to obtain the optical film 10 of the present invention.
- a long polarizer 11 is manufactured.
- a laminate 124 of the second protective layer (second transparent protective film) 15Z polarizer 11Z protective layer (transparent protective film) 12 is obtained.
- the surface of the protective layer (transparent protective film) 12 opposite to the polarizer 11 is subjected to a rubbing treatment with a rubbing roll 120.
- the rubbing direction is a direction having a predetermined angle with respect to the longitudinal direction of the transparent protective film 12, for example, a direction of ⁇ 22.5 °.
- the first optical compensation layer 13 is formed on the protective layer (transparent protective film) 12 subjected to the rubbing treatment as described in the above section B-2 and B-3.
- the liquid crystal material is aligned along the rubbing direction, so the slow axis direction is substantially the same as the rubbing direction of the protective layer (transparent protective film) 12 (arrow B direction).
- a laminate 123 (second protective layer 15, polarizer 11, protective layer 12, and first optical compensation layer 13) is obtained.
- a long laminate 125 (with the second optical compensation layer 14 supported on the base sheet 26) was prepared and laminated with this.
- the body 123 (second protective layer 15, polarizer 11, protective layer 12, and first optical compensation layer 13) is sent out in the direction of the arrow, and adhesives etc. (Not shown).
- the substrate sheet 26 is peeled off to obtain the optical film 10 of the present invention.
- the optical film of the present invention can be suitably used for various image display devices (for example, liquid crystal display devices, self-luminous display devices). Specific examples of applicable image display devices include a liquid crystal display device, an EL display, a plasma display (PD), and a field emission display (FED).
- image display devices for example, liquid crystal display devices, self-luminous display devices.
- image display devices include a liquid crystal display device, an EL display, a plasma display (PD), and a field emission display (FED).
- a liquid crystal display device it is useful, for example, for preventing light leakage and viewing angle compensation in black display.
- the optical film of the present invention is suitably used for a VA mode liquid crystal display device, and particularly suitably for a reflective and transflective VA mode liquid crystal display device.
- the optical film of the present invention is used for an EL display, it is useful for preventing electrode reflection, for example.
- a liquid crystal display device will be described as an example of the image display device of the present invention.
- a liquid crystal panel used in a liquid crystal display device will be described.
- any appropriate configuration may be adopted depending on the purpose.
- a reflective and transflective VA mode liquid crystal display device which is preferable for a VA mode liquid crystal display device, is particularly preferable.
- FIG. 8 is a schematic cross-sectional view of a liquid crystal panel according to a preferred embodiment of the present invention.
- a reflection type liquid crystal panel for a liquid crystal display device will be described.
- the liquid crystal panel 100 includes a liquid crystal cell 20, a retardation plate 30 disposed above the liquid crystal cell 20, and a polarizing plate 10 disposed above the retardation plate 30.
- the polarizing plate 10 the optical film of the present invention described in the above sections A and B is preferably used.
- the retardation plate 30 any appropriate retardation plate can be employed depending on the purpose and the alignment mode of the liquid crystal cell. Depending on the purpose and the alignment mode of the liquid crystal cell, the phase difference plate 30 may be omitted. Further, when the optical film of the present invention is used as the polarizing plate 10, the optical retardation can be omitted only by the polarizing plate 10, so that the retardation plate 30 can be omitted.
- the liquid crystal cell 20 includes a pair of glass substrates 21 and 21 ′ and a liquid crystal layer 22 as a display medium disposed between the substrates.
- a reflective electrode 23 is provided on the liquid crystal layer 22 side of the lower substrate 21 ′.
- the upper substrate 21 is provided with a color filter (not shown).
- the space (cell gap) between the substrates 21 and 21 ′ is controlled by a spacer 24.
- liquid crystal molecules are aligned perpendicular to the substrates 21 and 21 'when no voltage is applied.
- Such vertical alignment can be realized by arranging a nematic liquid crystal having negative dielectric anisotropy between substrates on which a vertical alignment film (not shown) is formed.
- a vertical alignment film (not shown) is formed.
- the incident light travels without changing the polarization direction, is reflected by the reflective electrode 23, passes through the liquid crystal layer 22 again, and is emitted from the upper substrate 21.
- the polarization state of the emitted light is the same as when it was incident Thus, the emitted light passes through the polarizing plate 10 and a bright display is obtained.
- the long axes of the liquid crystal molecules are aligned parallel to the substrate surface. Liquid crystal molecules exhibit birefringence with respect to linearly polarized light incident on the liquid crystal layer 22 in this state, and the polarization state of incident light changes according to the inclination of the liquid crystal molecules.
- the light reflected from the reflecting electrode 23 and emitted from the upper substrate becomes, for example, linearly polarized light whose polarization orientation is rotated by 90 °, and is thus absorbed by the polarizing plate 10 and in a dark state. Is obtained.
- the display can be returned to the bright state by the orientation regulating force. Further, gradation display is possible by changing the intensity of light transmitted from the polarizing plate 10 by changing the applied voltage to control the tilt of the liquid crystal molecules.
- the refractive indices nx , ny and nz of the sample film were measured with an automatic birefringence measuring device (manufactured by Oji Scientific Instruments Co., Ltd., automatic birefringence meter KOBRA31PR), and the in-plane phase difference Re and the thickness direction phase difference Rth were calculated. .
- the measurement temperature was 23 ° C and the measurement wavelength was 590 nm.
- the thickness of the first optical compensation layer was measured by an interference film thickness measurement method using MCPD2000 manufactured by Otsuka Electronics. The thicknesses of other various films were measured using a dial gauge.
- a first optical compensation layer (B-1) which is a uniaxial film, was formed. The thickness and retardation of the first optical compensation layer (B-1) were adjusted by changing the coating amount of the coating solution, and the thickness was 2.2 m and the retardation was 250 nm.
- a polarizer was obtained by uniaxially stretching 6 times between rolls having different speed ratios in an aqueous solution containing boric acid.
- TAC film thickness 40 ⁇ m
- alignment substrate A-1
- first optical compensation layer B-1) layered laminate (XI)
- the laminate (Y1) here is a laminate in which the angle between the absorption axis of the polarizer and the slow axis of the first optical compensation layer (B-1) is 22.5 °, This is a generic term that includes both the laminated body whose angle between the absorption axis of the polarizer and the slow axis of the first optical compensation layer (B-1) is 22.5 °.
- Second optical compensation layer (C—1) Fabrication of laminate (Z1) with Z-Zeonor force
- C-1) Z First Optical Compensation Layer (B-1) Z Oriented Substrate (A-1) Z Polarizer
- An optical film (1) having a ZTAC force was obtained. Further, an adhesive layer having a thickness of 20 ⁇ m was bonded onto the second optical compensation layer to form an adhesive layer, thereby producing an optical film (1A).
- An alignment substrate (A-2) was prepared in the same manner as "a. Preparation of alignment substrate (A-1)".
- the first optical compensation layer (B-2) was prepared in the same manner as "b. Preparation of laminate (XI) consisting of the first optical compensation layer (B-1) Z-oriented substrate (A-1)".
- a laminate (X2) comprising a Z-oriented substrate (A-2) was produced.
- the first optical compensation layer (B-2) ZTACZ polarizer ZTAC A layered body (Y2) was produced.
- phase difference of the polyimide layer (second optical compensation layer (C 2)) alone was measured using KOBRA2 1—ADH manufactured by Oji Scientific.
- Example 2 the laminate (Y2) and the laminate (Z2) are laminated, and the “Zenoah” is peeled off to obtain the second optical compensation layer (C 2) Z the first optical compensation layer (B — 2) ZTACZ polarizer An optical film (2) having ZTA C force was obtained. Furthermore, an adhesive layer having a thickness of 20 / zm was bonded onto the second optical compensation layer to form an adhesive layer, thereby producing an optical film (2A).
- An alignment substrate (A-3) was prepared in the same manner as "a. Preparation of alignment substrate (A-1)".
- the first optical compensation layer (B-3) was prepared in the same manner as “b. Preparation of laminate (XI) composed of the first optical compensation layer (B-1) Z-oriented substrate (A-1)”.
- a laminate (X3) composed of a Z-oriented substrate (A-3) was produced.
- a stack (Y3) was produced.
- Example 2 Similarly to Example 1, the laminate (Y3) and the laminate (Z3) are laminated, and the “Zenoah” is peeled off to remove the second optical compensation layer (C 3) Z the first optical compensation layer (B — 3) ZTACZ polarizer An optical film (3) with ZTA C force was obtained. Further, an adhesive layer having a thickness of 20 / zm was laminated on the second optical compensation layer to form an adhesive layer, thereby producing an optical film (3A).
- An alignment substrate (A-4) was prepared in the same manner as "a. Preparation of alignment substrate (A-1)".
- the first optical compensation layer (B-4) was prepared in the same manner as “b. Preparation of laminate (XI) comprising the first optical compensation layer (B-1) Z-oriented substrate (A-1)”.
- a laminate (X4) consisting of a Z-oriented substrate (A-4) was prepared.
- the first optical compensation layer (B—4) ZTACZ polarizer ZTAC is obtained in the same manner as “1st optical compensation layer (B—D Preparation of ZTACZ polarizer ZTAC (Y1)”).
- a stack (Y4) was produced.
- phase difference of the polyimide layer (second optical compensation layer (C 4)) alone was measured using KOBRA2 1—ADH manufactured by Oji Scientific.
- Example 2 Similarly to Example 1, the laminate (Y4) and the laminate (Z4) were laminated, and the “Zenoah” was peeled off to obtain the second optical compensation layer (C 4) Z the first optical compensation layer (B — 4) ZTACZ polarizer An optical film (4) with ZTA C force was obtained. Further, an adhesive layer having a thickness of 20 / zm was laminated on the second optical compensation layer to form an adhesive layer, thereby producing an optical film (4A).
- An alignment substrate (A-5) was prepared in the same manner as "a. Preparation of alignment substrate (A-1)".
- the first optical compensation layer (B-5) was prepared in the same manner as “b. Preparation of laminate (XI) consisting of the first optical compensation layer (B-1) Z-oriented substrate (A-1)”.
- a laminate (X5) composed of a Z-oriented substrate (A-5) was produced.
- First optical compensation layer (B—5 ZTACZ polarizer ZTAC) A stack (Y5) was produced.
- phase difference of the polyimide layer (second optical compensation layer (C 5)) alone was measured using KOBRA2 1—ADH manufactured by Oji Scientific.
- the force was 22 nm
- the thickness direction retardation Rth was 142 nm
- the Nz coefficient (Nz (nx—nz) Z (nx—ny)) was 1.16.
- Example 6 the laminate (Y5) and the laminate (Z5) are laminated, and the “Zenoah” is peeled off to obtain the second optical compensation layer (C 5) Z the first optical compensation layer (B — 5) ZTACZ polarizer An optical film (5) having ZTA C force was obtained. Furthermore, a thickness of 20 / zm is formed on the second optical compensation layer. An adhesive layer was formed by laminating an adhesive, and an optical film (5A) was produced.
- An orientation substrate (A-6) was produced in the same manner as in “a. Production of orientation substrate (A-1)”.
- the first optical compensation layer (B-6) was prepared in the same manner as “b. Preparation of laminate (XI) composed of the first optical compensation layer (B-1) Z-oriented substrate (A-1)”.
- a laminate (X6) comprising a Z-oriented substrate (A-6) was produced.
- First optical compensation layer (B—6 ZTACZ polarizer ZTAC) A stack (Y6) was produced.
- Second optical compensation layer (C—6) Fabrication of laminate (Z6) consisting of Z Zeonaka
- phase difference of the polyimide layer (second optical compensation layer (C 6)) alone was measured using KOBRA2 1—ADH manufactured by Oji Scientific Co., Ltd.
- the force was 24 nm
- the thickness direction retardation Rth was 261 nm
- the Nz coefficient (Nz (nx—nz) Z (nx—ny)) was 2.1.
- Example 2 Similarly to Example 1, the laminate (Y6) and the laminate (Z6) were laminated, and the “Zenoah” was peeled off to obtain the second optical compensation layer (C 6) Z the first optical compensation layer (B — 6) ZTACZ polarizer An optical film (6) having ZTA C force was obtained. Furthermore, an adhesive layer having a thickness of 20 / zm was laminated on the second optical compensation layer to form an adhesive layer, thereby producing an optical film (6A).
- Example 1 instead of the first optical compensation layer (B-1), a "Zeonor" uniaxially stretched film was used as the first optical compensation layer (B-7), and the second optical compensation layer was used. Instead of layer (C-1) Honor's biaxially stretched film is used as the second optical compensation layer (C-7), and the first optical compensation layer and the second optical compensation layer are bonded to the polarizing plate (TACZ polarizer ZTAC).
- An optical film (7) and an optical film (7A) with an adhesive layer were produced in the same manner as in Example 1 except that a 12 / zm adhesive was used.
- Example 1 instead of the second optical compensation layer (C-1), a “Zeonor” biaxially stretched film was used as the second optical compensation layer (C-8), and the first optical compensation layer (C-8) was used.
- the optical film (8) and the optical film (8) and the second optical compensation layer were bonded to the polarizing plate (TACZ polarizer ZTAC), except that a 12 m thick adhesive was used.
- An optical film (8A) with an adhesive layer was prepared.
- Example 1 instead of the second optical compensation layer (C-1), a polycarbonate biaxially stretched film was used as the second optical compensation layer (C-9), and the first optical compensation layer was used.
- the optical film (9) and the pressure-sensitive adhesive layer were the same as in Example 1 except that a 12-m thick pressure-sensitive adhesive was used for bonding the second optical compensation layer and the polarizing plate (TACZ polarizer ZTAC).
- the attached optical film (9A) was produced.
- the thickness of the optical film obtained in the example was measured.
- the results are shown in Table 1.
- the optical film obtained in the example was mounted on a VA-LCD, and the contrast ratio was measured. Specifically, an optical film having an angle of + 22.5 ° between the slow axis of the first optical compensation layer and the absorption axis of the polarizer is used as an upper plate, and a commercially available VA— Affixed to the LCD. Next, an optical film of ⁇ 22.5 ° formed between the slow axis of the first optical compensation layer and the absorption axis of the polarizer is used as the lower plate, and the absorption axis of the polarizer and the lower plate in the upper optical film are used. The optical film was bonded to a commercially available VA-LCD through an adhesive so that the angle formed with the absorption axis of the polarizer was 90 °.
- the luminance and chromaticity of the obtained LCD panel were measured by driving a liquid crystal using a luminance meter BM-5A manufactured by Topcon Corporation.
- the LCD panel was displayed in black and white, and the luminance at the center was measured from the front direction to calculate the front contrast ratio.
- the contrast ratio from the top / bottom / left / right 60 ° direction of the LCD panel was also calculated.
- Example 5 3 5 1 9 9 1 0 2 1 0 6 1 0 2
- Example 6 3 4 5 1 2 1 1 2 6 1 3 0 1 2
- Example 7 4 4 1 1 9 4 1 8 1 1 9 8 1 9 2
- Example 8 2 4 5 9 7 9 5 1 0 2 9 6
- Difficult example 9 3 7 5 1 7 5 1 7 7 1 8 2 1 8 8 From Table 2, the front contrast ratio is different for Example 8 It can be seen that it is inferior to the working example (the front contrast ratio other than the working example 8 is 300 or more). In Example 8, a blue color was seen in black display (except in Example 8, no color was seen in black display).
- Examples 1-6 are less than Examples 7-9 in the decrease in contrast ratio in the oblique direction (up / down / left / right 60 °) with respect to the front contrast ratio.
- Example 9 shows that the high-temperature transmittance in black display is about three times that of the other, and light at high temperature You can see that there are many omissions. That is, in Example 9, it can be seen that the thermal unevenness is large.
- the optical film of the present invention can be suitably used for various image display devices (for example, liquid crystal display devices, self-luminous display devices).
- image display devices for example, liquid crystal display devices, self-luminous display devices.
Abstract
Description
Claims
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US11/817,762 US7906184B2 (en) | 2005-03-02 | 2006-01-30 | Optical film, method of producing the same, and image display apparatus using the optical film |
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US (1) | US7906184B2 (ja) |
JP (1) | JP3974631B2 (ja) |
KR (1) | KR100832276B1 (ja) |
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CN108345139B (zh) | 2017-01-25 | 2022-04-22 | 中强光电股份有限公司 | 视角可切换显示装置 |
WO2019124456A1 (ja) | 2017-12-20 | 2019-06-27 | 日本ゼオン株式会社 | 円偏光板、長尺の広帯域λ/4板、有機エレクトロルミネッセンス表示装置及び液晶表示装置 |
CN109946780B (zh) * | 2018-02-13 | 2020-09-04 | 华为技术有限公司 | 保护膜、切割保护膜的方法和装置 |
KR20210107650A (ko) | 2018-12-27 | 2021-09-01 | 니폰 제온 가부시키가이샤 | 광학 이방성 적층체 및 그 제조 방법, 원 편광판, 그리고 화상 표시 장치 |
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- 2006-01-30 KR KR1020077020051A patent/KR100832276B1/ko active IP Right Grant
- 2006-01-30 CN CNB2006800069528A patent/CN100504463C/zh not_active Expired - Fee Related
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Also Published As
Publication number | Publication date |
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KR20070097596A (ko) | 2007-10-04 |
JP2007004120A (ja) | 2007-01-11 |
TW200639450A (en) | 2006-11-16 |
KR100832276B1 (ko) | 2008-05-26 |
CN101133349A (zh) | 2008-02-27 |
US20090052028A1 (en) | 2009-02-26 |
US7906184B2 (en) | 2011-03-15 |
JP3974631B2 (ja) | 2007-09-12 |
TWI274918B (en) | 2007-03-01 |
CN100504463C (zh) | 2009-06-24 |
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