WO2007023673A1 - 液晶パネルおよびそれを用いた液晶表示装置 - Google Patents
液晶パネルおよびそれを用いた液晶表示装置 Download PDFInfo
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- WO2007023673A1 WO2007023673A1 PCT/JP2006/315712 JP2006315712W WO2007023673A1 WO 2007023673 A1 WO2007023673 A1 WO 2007023673A1 JP 2006315712 W JP2006315712 W JP 2006315712W WO 2007023673 A1 WO2007023673 A1 WO 2007023673A1
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- liquid crystal
- optical compensation
- compensation layer
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- layer
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Classifications
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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
-
- 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
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
- G02B5/3083—Birefringent or phase retarding elements
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/13363—Birefringent elements, e.g. for optical compensation
Definitions
- the present invention relates to a liquid crystal panel and a liquid crystal display device using the same. More specifically
- the present invention relates to a liquid crystal panel having a very small color shift and a liquid crystal display device using the same.
- the liquid crystal molecules are aligned in the vertical direction, when the liquid crystal panel is observed from a direction deviated from the normal direction, the liquid crystal molecules are apparently oblique. It becomes a state oriented in the direction. As a result, there is a problem that light leakage occurs under the influence of the birefringence of the liquid crystal molecules and the viewing angle becomes narrow.
- a biaxial optical compensator having a refractive index distribution of nx> ny> nz is used to prevent light leakage due to birefringence of liquid crystal molecules and axial misalignment of the polarizing plate.
- Techniques for compensating for the effects have been proposed (see, for example, Patent Documents 1 to 3). However, these technologies are V, and even the shift cannot sufficiently reduce the color shift.
- Patent Document 1 Japanese Patent Laid-Open No. 2003-926
- Patent Document 2 Japanese Patent Laid-Open No. 2003-27488
- Patent Document 3 Japanese Patent Laid-Open No. 2003-38734
- the present invention has been made to solve the above-described conventional problems, and an object thereof is to provide a liquid crystal panel having a very small color shift and a liquid crystal display device using the same. .
- the liquid crystal panel of the present invention has a first polarizer, a first optical compensation layer, a liquid crystal cell, a second optical compensation layer, and a second polarizer in this order,
- Each of the first optical compensation layer and the second optical compensation layer includes at least one polymer selected from the group force of polyimide, polyamide, polyester, polyetherketone, polyamideimide, and polyesterimide, and nx> ny> nz, where nx is the refractive index in the slow axis direction of the optical compensation layer, ny is the refractive index in the fast axis direction of the optical compensation layer, and nz is the light This is the refractive index in the thickness direction of the optical compensation layer.
- the first optical compensation layer and the second optical compensation layer each have a thickness of 0.5 to 10 ⁇ m.
- each of the first optical compensation layer and the second optical compensation layer has an Nz coefficient of 2 ⁇ Nz ⁇ 20.
- the liquid crystal panel includes a first protective layer between the first optical compensation layer and the first polarizer, and the second optical A second protective layer is further provided between the compensation layer and the second polarizer.
- the first protective layer and the second protective layer each contain a cellulosic polymer, and the thickness of at least one of the first protective layer and the second protective layer
- the liquid crystal cell is in a VA mode or an OCB mode.
- a liquid crystal display device includes the liquid crystal panel.
- the present invention it is possible to significantly reduce the color shift by disposing the specific optical compensation layer on both sides of the liquid crystal cell as compared with the case where it is disposed on one side. .
- the optical compensation layers disposed on both sides of the liquid crystal cell are the same.
- One characteristic for example, constituent material, optical characteristic, thickness.
- the color shift can be further reduced.
- the color shift can be further reduced by disposing a protective layer having a small thickness direction retardation between the optical compensation layer and the polarizer.
- the liquid crystal cell according to the present invention has a positive chromatic dispersion characteristic in which the phase difference decreases as the force wavelength increases mainly with respect to the VA mode or the OCB mode, and the inclination thereof is large.
- the non-liquid crystal material such as polyimide in the present invention similarly has a positive wavelength dispersion characteristic, and is arranged on both sides of the liquid crystal cell having a large inclination, thereby matching the wavelength dispersion characteristic of the liquid crystal cell and optical characteristics. Will improve.
- FIG. 1 is a schematic cross-sectional view of a liquid crystal panel according to a preferred embodiment of the present invention.
- FIG. 2 is a schematic cross-sectional view illustrating the alignment state of liquid crystal molecules in a liquid crystal layer when the liquid crystal display device of the present invention employs a VA mode liquid crystal cell.
- FIG. 3 is a schematic cross-sectional view for explaining the alignment state of liquid crystal molecules in a liquid crystal layer when the liquid crystal display device of the present invention employs an OCB mode liquid crystal cell.
- FIG. 4 is a graph showing the relationship between the X value and y value of the liquid crystal panel of Example 1 and the azimuth angle.
- FIG. 5 is an xy chromaticity diagram of the liquid crystal panel of Example 1.
- FIG. 6 is a graph showing the relationship between the X value and y value of the liquid crystal panel of Example 2 and the azimuth angle.
- FIG. 7 is a graph showing the relationship between the X value and y value of the liquid crystal panel of Comparative Example 1 and the azimuth angle.
- FIG. 8 is an xy chromaticity diagram of the liquid crystal panel of Comparative Example 1.
- FIG. 9 is a graph showing the relationship between the X value and y value of the liquid crystal panel of Comparative Example 2 and the azimuth angle.
- FIG. 10 is a graph showing the relationship between the X value and y value of the liquid crystal panel of Comparative Example 3 and the azimuth angle. Explanation of symbols
- Second optical compensation layer 50 Second polarizer
- FIG. 1 is a schematic cross-sectional view of a liquid crystal panel according to a preferred embodiment of the present invention.
- the liquid crystal panel 100 includes, in order from the viewing side, the first polarizer 10, the first optical compensation layer 20, the liquid crystal cell 30, the second optical compensation layer 40, and the second polarization. Has 50 children in this order.
- the first polarizer 10 and the second polarizer 50 are typically arranged such that their absorption axes are orthogonal to each other.
- the liquid crystal cell 30 includes a pair of glass substrates 31 and 32 and a liquid crystal layer 33 as a display medium disposed between the substrates.
- One substrate (active matrix substrate) 32 includes a switching element (typically TFT) for controlling the electro-optical characteristics of the liquid crystal, and a scanning line for supplying a gate signal to the switching element and a signal line for supplying a source signal. It is provided (V, deviation not shown).
- the other glass substrate (color filter substrate) 31 is provided with a color filter (not shown).
- the color filter may be provided on the active matrix substrate 32.
- the distance between the substrates 31 and 32 (cell gap) is controlled by a spacer 34.
- An alignment film (not shown) made of polyimide, for example, is provided on the side of the substrates 31 and 32 in contact with the liquid crystal layer 33.
- a first protective layer (not shown) is provided between the first optical compensation layer 20 and the first polarizer 10, and the second optical compensation layer 40 and the second polarization are provided.
- a second protective layer (not shown) is provided between the child 50.
- another protective layer (not shown) is provided on the opposite side of the first polarizer 10 from the first optical compensation layer 20 (outside of the first polarizer 10, the viewing side in the illustrated example).
- a further protective layer (not shown) on the opposite side of the second polarizer 50 from the second optical compensation layer 40 (outside of the second polarizer 50, in the illustrated example, the backlight side). ) Is provided.
- any appropriate driving mode can be adopted as long as the effect of the present invention is obtained.
- Specific examples of drive modes include STN (Super Twisted Nematic) mode, TN (Twisted Nematic) mode, IPS (In- Plane Switting) mode, VA (Vertical Aligned) mode, OCB (Optically Aligned Bir efringence) mode, HAN (Hybrid Aligned Nematic) mode and ASM (Axi ally Symmetric Aligned Microcell) mode.
- STN Super Twisted Nematic
- TN Transmission Nematic
- IPS In- Plane Switting
- VA Very Aligned
- OCB Optically Aligned Bir efringence
- HAN Hybrid Aligned Nematic
- ASM Ad Aligned Microcell
- FIGS. 2A and 2B are schematic cross-sectional views illustrating the alignment state of liquid crystal molecules in the VA mode.
- Fig. 2 (a) when no voltage is applied, the liquid crystal molecules are aligned perpendicular to the substrates 31 and 32.
- 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
- Light that passes through the liquid crystal layer when a predetermined maximum voltage is applied becomes, for example, linearly polarized light whose polarization direction is rotated by 90 °, so that a bright display can be obtained through the polarizer 10.
- the display can be returned to the dark state by the orientation regulating force.
- gradation display is possible by changing the intensity of transmitted light from the polarizer 10 by changing the applied voltage to control the tilt of the liquid crystal molecules.
- FIGS. 3A to 3D are schematic cross-sectional views illustrating the alignment state of liquid crystal molecules in the OCB mode.
- the OCB mode is a display mode in which the liquid crystal layer 33 is configured by so-called bend alignment.
- the bend orientation has a substantially parallel angle (orientation angle) when the nematic liquid crystal molecules are in the vicinity of the substrate, and the orientation angle increases toward the center of the liquid crystal layer. Therefore, the liquid crystal layer has an angle perpendicular to the plane of the substrate, gradually changes so as to be aligned with the opposite substrate surface as it is away from the center of the liquid crystal layer, and has no twisted structure throughout the liquid crystal layer.
- the orientation state is changed.
- Such a bend orientation is formed as follows.
- Fig. 3 (a) no electric field is applied.
- the liquid crystal molecules are substantially homogeneously aligned.
- the liquid crystal molecules have a pretilt angle, and the pretilt angle near the substrate is different from the pretilt angle near the opposite substrate.
- a predetermined noise voltage typically 1.5 V to 1.9 V
- the splay orientation shown in Fig. 3 (b) is applied, and Fig. 3 (c)
- a transition to bend orientation as shown can be achieved.
- a display voltage typically 5V to 7V
- the liquid crystal molecules rise almost perpendicular to the substrate surface as shown in Fig.
- Liquid crystal display devices equipped with OCB mode liquid crystal cells can switch the splay alignment state force to the bend alignment state at a very high speed, so liquid crystal display devices in other drive modes such as TN mode and IPS mode. Compared to the above, it has a feature of excellent moving image display characteristics.
- the in-plane retardation (front retardation) And of the first optical compensation layer 20 can be optimized in accordance with the driving mode of the liquid crystal cell.
- the in-plane retardation A nd of the second optical compensation layer 40 is also
- a nd and A nd may be the same or different.
- a nd and A nd may be the same or different.
- each optical compensation layer is the same. There is also a remarkable power to improve the color shift.
- the lower limits of A nd and A nd are each preferably 5 nm or more.
- a nd and A nd are each preferably 400 nm or less, more preferably 300 nm or less,
- the viewing angle is often small. More specifically, when the liquid crystal cell adopts the VA mode, And and And are preferably 5 to: LOOnm, more preferably
- liquid crystal cell 10 to 70 nm, most preferably 30 to 50 nm.
- And and And are each preferably 5 to 400 nm, more preferably
- nx is the refractive index in the slow axis direction of the optical compensation layer
- ny is the refractive index in the fast axis direction of the optical compensation layer
- d (nm) is the thickness of the optical compensation layer.
- the slow axis refers to the direction in which the in-plane refractive index is maximized
- the fast axis refers to the direction perpendicular to the slow axis in the plane.
- the thickness direction retardation Rth of the first optical compensation layer 20 can also be optimized in accordance with the drive mode of the liquid crystal cell. Furthermore, the thickness direction retardation Rth of the second optical compensation layer 40 is
- Rth and Rth may be the same or different.
- Rth and Rth may be the same or different.
- each optical compensation layer is the same. This is because the effect of improving the color shift is remarkable.
- the lower limits of Rth and Rth are each preferably lOnm or more
- Rth and Rth are each preferably lOOOnm or less, more preferably 500 nm or less.
- Rth or Rth force exceeds ⁇ OOOnm
- Rth and Rth are preferably 10 to 300 nm, more preferably 20 to 250 nm, most preferably
- Rth and Rth are preferably 10 to: L000 nm, more preferably 20 to 500 nm,
- nz is the refractive index in the thickness direction of the film (optical compensation layer).
- Rth is also typically measured using light with a wavelength of 590 nm.
- the Nz coefficient of each of the first optical compensation layer 20 and the second optical compensation layer 40 is preferably 2 to 20, more preferably 2 to 10, especially preferably 2 to 8, and most preferably 2 to 6.
- the Nz coefficient of the first optical compensation layer 20 and the second optical compensation layer 40 is preferably 2 to 10, more preferably 2 respectively. ⁇ 8, most preferably 2-6.
- the Nz coefficient of the first optical compensation layer 20 and the second optical compensation layer 40 is preferably 2 to 20, more preferably 2 to 10, and most preferably 2.
- each of the first optical compensation layer 20 and the second optical compensation layer 40 has a refractive index distribution of nx> ny> nz.
- optical compensation layers having such optical characteristics (ie, And, Rth, refractive index distribution and Nz coefficient) on both sides of the liquid crystal cell (more preferably, the same optical compensation layer is symmetrical) By arranging it, a liquid crystal panel with a very small color shift can be obtained.
- each of the first optical compensation layer 20 and the second optical compensation layer 40 may have any appropriate thickness as long as the effects of the present invention are exhibited.
- the thickness of each of the first optical compensation layer 20 and the second optical compensation layer 40 is preferably 0.1 to 50 / ⁇ ⁇ , and more preferably 0.5 to 30 111. Particularly preferred is 0.5 to: LO / zm, particularly preferred is 1 to: LO / zm, and most preferred is 1.5 to 5 / ⁇ ⁇ . This is because an optical compensation layer that can contribute to thinning of the liquid crystal display device and has excellent viewing angle compensation performance and a uniform phase difference can be obtained.
- the thicknesses of the first optical compensation layer 20 and the second optical compensation layer 40 may be the same or different.
- each optical compensation layer 20 and the second optical compensation layer 40 may be a single layer or a laminate of two or more layers. In the case of a laminate, the material constituting each layer and the thickness of each layer can be appropriately set as long as the entire laminate has the optical characteristics as described above.
- the first optical compensation layer 20 and the second optical compensation layer 40 may be made of the same material or different materials.
- the constituent material of the optical compensation layer includes a non-liquid crystalline material. Particularly preferred is a non-liquid crystalline polymer.
- a non-liquid crystalline material unlike a liquid crystalline material, can form a film exhibiting optical uniaxial properties of nx> nz and ny> nz due to its own properties that are related to the orientation of the substrate.
- an oriented substrate can be used.
- the step of applying an alignment film on the surface, the step of laminating the alignment film, and the like can be omitted.
- non-liquid crystalline material examples include polymers such as polyamide, polyimide, polyester, polyetherketone, polyamideimide, and polyesterimide because of excellent heat resistance, chemical resistance, transparency, and high rigidity. Is preferred. Any one of these polymers may be used alone, or, for example, a mixture of two or more kinds having different functional groups, such as a mixture of polyaryletherketone and polyamide. .
- polyimide is particularly preferred because of its high transparency, high orientation, and high stretchability.
- Polyimide is preferable because it has a positive chromatic dispersion characteristic in which the phase difference decreases as the wavelength increases, and its slope matches optimally with the chromatic dispersion characteristics of VA mode and OCB mode liquid crystal cells.
- 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.
- polyimide for example, polyimide soluble in an organic solvent having high in-plane orientation is used. 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 a hydrogen, halogen, phenyl group, a phenyl group substituted with 1 to 4 halogen atoms or a c to alkyl group, And C ⁇
- 1 10 1 10 Alkyl group power Group power is at least one selected substituent.
- R 3 to R 6 are each independently selected from the group consisting of halogen, a phenol group, a fluorine group substituted with 1 to 4 halogen atoms or a C to alkyl group, and a C to alkyl group.
- Z is, for example, a C to tetravalent aromatic group, preferably pyromellitic.
- Z ′ is, for example, a covalent bond, C (R 7 ) group, CO group, O atom, S atom, SO group, Si (CH 3) group, or NR 8 group, Each may be the same May be different.
- 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
- C ⁇ aryl group and in the case of multiple groups, 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 the substituted derivatives of the polycyclic aromatic group include C to C alkyl groups, fluorinated derivatives thereof, and
- the group power consisting of halogen powers such as F and C1 The above polycyclic aromatic groups substituted with at least one selected group are exemplified.
- 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 3) group, a C (CF 3) group, C (CX 2) 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 phenol group include halogen, C alkyl group, and
- Rogeny ⁇ ⁇ has at least one substituent that can be selected as a group force.
- halogen examples include fluorine, chlorine, bromine and iodine.
- d is an integer from 0 to 2
- e is an integer from 0 to 3.
- 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 hydrogen, halogen, a phenol group, It is a group selected from the group consisting of a substituted phenyl group, an alkyl group, and a substituted alkyl 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, for example, those represented by the following formula (6).
- examples of the polyimide include a copolymer obtained by appropriately copolymerizing acid dianhydride and diamine 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. Dianhydrides, 3,6-dibromopyromellitic dianhydride, 3,6-dichloropyromellitic dianhydride, and the like.
- benzophenone tetracarboxylic dianhydride examples include 3, 3 ′, 4, 4 'monobenzophenone tetracarboxylic dianhydride, 2, 3, 3', 4 'monobenzophenone tetracarboxylic dianhydride, 2, 2', 3, 3'-benzophenone tetra
- examples thereof include carboxylic dianhydrides.
- 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, -biphenyl tetracarboxylic 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 Dicarboxyl Phenolic)-2, 2 Diphenol Mouth Panni Anhydride, Bis (3, 4-Dicarboxy Phenyl- ) Ether dianhydride, 4, 4, oxydiphthalic dianhydride, bis (3,4-dicarboxyphenol) sulfonic dianhydride, 3, 3, 4, 4, 4, diphenylsulfone Tetracarboxylic dianhydride, 4, 4, 1 [4,
- aromatic tetracarboxylic dianhydride 2,2'-substituted biphenyltetracarboxylic dianhydride is more preferable, and 2,2'-bis (trihalomethyl) is more preferable.
- diamine include aromatic diamines, and specific examples include benzendiamine, diaminobenzophenone, naphthalenediamine, heterocyclic aromatic diamine, and other aromatic diamines. It is done.
- Examples of the benzenediamine include o-, m- and p-phenylenediamine, 2,4 diaminotoluene, 1,4 diamino1-2-methoxybenzene, 1,4 diamino1-2 phenolbenzene 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 (4 aminophenol) 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) benzen
- 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.
- the lower alkyl group for example, an alkyl group having a linear or branched chain of C to C is more preferable.
- a methyl group, a propyl group, an isopropyl group, a butyl group, an isobutyl group, a sec-butyl group, and a tert-butyl group are preferred, and a methyl group and an ethyl group are particularly preferred.
- the halogenoalkyl group include halogenated compounds of the above lower alkyl groups such as a trifluoromethyl group.
- Examples of the lower alkoxy group include C to C
- the halogenated alkoxy group include halogenated compounds of the above lower alkoxy groups 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, for example, X in the above formula (7).
- 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 end of the polyaryletherketone represented by the above formula (7) is fluorine on the p-tetrafluorobenzobenzoylene 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. [0068] [Chemical 11]
- 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).
- examples of the above-mentioned polyamide or polyester 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 is, 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 from 0 to 3, preferably an integer from 0 to 2.
- X and y are 0 or 1, respectively.
- a typical forming method includes a step of applying a solution of the non-liquid crystalline polymer to the base film and a step of forming a non-liquid crystalline polymer layer by removing the solvent in the solution.
- the base film finally becomes the first or second protective layer. Therefore, a film (typically a cellulose film) constituting the first and second protective layers is used as the base film. Details of the cellulosic film are described in Section D below.
- the solvent of the coating solution is not particularly limited, and examples thereof include black mouth honoreme, dichloromethane, carbon tetrachloride, dichloroethane, tetrachloro mouth ethane, and trichloroethane.
- Chlorogenic hydrocarbons such as ethylene, tetrachloroethylene, black-opened benzene and onolesic-dichloro-opened benzene; phenols such as phenol and barachlorophenol; benzene and toluene
- Aromatic hydrocarbons such as xylene, methoxybenzene, 1,2-dimethoxybenzene; acetone, methyl ethyl ketone, methyl isobutyl ketone, cyclohexanone, cyclopentanone, 2-pyrrolidone, N-methyl-2- Ketone solvents such as pyrrolidone; ester solvents such as ethyl acetate and butyl acetate; t-butyl alcohol, glycerin, ethylene glycol, triethylene glycol, ethylene glycol monomethyl ether, diethylene glycol dimethyl ether, propylene glycol, dipropylene glycol, 2- Alcohol solvents such as methyl-2,4-pentanediol; Amides solvents such as dimethylformamide and dimethylacetamide; -Tolyl solvents such as acetonitrile, buthiguchi-tolyl; Jetyl ether, dibutyl ether, Ether solvents such
- the concentration of the non-liquid crystalline polymer in the coating solution may be any appropriate concentration as long as the optical compensation layer as described above is obtained and coating is possible.
- the solution preferably contains 5 to 50 parts by weight, more preferably 10 to 40 parts by weight of the non-liquid crystalline polymer with respect to 100 parts by weight of the solvent.
- a solution having such a concentration range has a viscosity that is easy to apply.
- the coating solution may further contain various additives such as a stabilizer, a plasticizer, and metals as necessary.
- the coating solution may further contain other different fats as necessary.
- other resins 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.
- Examples of the general-purpose resin include polyethylene (PE), polypropylene (PP), polystyrene (PS), polymethyl methacrylate (PMMA), ABS resin, and AS resin. It is done.
- Examples of the engineering plastic include polyacetate (POM), polycarbonate (PC), polyamide (PA: nylon), polyethylene terephthalate (PET), and polybutylene terephthalate (PBT).
- Examples of the thermoplastic resin include polyphenylene sulfide (PPS), polyether sulfone (PES), polyketone (PK), polyimide (PI), polycyclohexane dimethanol terephthalate (PCT), polyarylate (PAR). ), And liquid crystal polymer (LCP).
- Examples of the thermosetting resin include epoxy resin and phenol novolac resin.
- the type and amount of the different rosin added to the coating solution can be appropriately set according to the purpose.
- a resin can be added in a proportion of preferably 0 to 50% by mass, more preferably 0 to 30% by mass with respect to the non-liquid crystalline polymer.
- Examples of the coating method for the solution include spin coating, roll coating, flow coating, printing, dip coating, casting film formation, bar coating, and gravure printing. It is done.
- a polymer layer superimposing method may be employed as necessary.
- the solvent in the solution is evaporated and removed by natural drying, air drying, heat drying (for example, 60 to 250 ° C), and the base film (finally the first or second film).
- An optical compensation layer is formed thereon.
- a process for imparting optical biaxiality (nx>ny> nz) may be performed.
- a difference in refractive index (nx> ny) can be reliably imparted in the surface, and an optical compensation layer having optical biaxiality (nx>ny> nz) is obtained. It is done.
- a typical example of a method for imparting a difference in refractive index in the plane is a method in which the base film and the optical compensation layer formed on the base film are integrally stretched or shrunk. . In a preferred embodiment, the film is stretched or contracted by heating to a predetermined temperature.
- the heating temperature is, for example, 120 to 180 ° C.
- the stretching ratio is, for example, 1.1 to 1.5 times, preferably 1.1 to 1.3 times.
- an optical compensation layer is formed (in other words, a laminate of the optical compensation layer and the protective layer is obtained).
- the base film any appropriate film that does not constitute a protective layer may be used.
- the formed optical compensation layer is a base material film. Ilm forces can also be transferred to the protective layer or polarizer.
- any appropriate polarizer can be adopted as the first polarizer 10 and the second polarizer 50 depending on the purpose.
- a dichroic substance such as iodine or a dichroic dye is added to a hydrophilic polymer film such as a polybulal alcohol film, a partially formalized polyalcohol film, or an ethylene butyl acetate copolymer partially saponified film.
- Polyethylene-based oriented films such as those adsorbed and uniaxially stretched, polyvinyl alcohol dehydrated products, and polyvinyl chloride dehydrochlorinated products.
- a polarizer obtained by adsorbing a dichroic substance such as iodine on a polybulal alcohol film and uniaxially stretching is particularly preferable because of its high polarization dichroic ratio.
- the thickness of these polarizers is not particularly limited, but is generally about 5 to 80 / ⁇ ⁇ .
- the first polarizer 10 and the second polarizer 50 may be the same or different.
- a polarizer uniaxially stretched by adsorbing iodine to a polybulualcohol-based film is dyed by immersing polyvinyl alcohol in an aqueous solution of iodine and stretched to 3 to 7 times the original length.
- 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.
- the polybulal alcohol film may be immersed in water and washed before dyeing. By washing the polybulal alcohol film with water, it is possible not only to clean the surface of the polybulal alcohol film but also the anti-blocking agent.
- Stretching may be performed after dyeing with iodine, or may be performed while dyeing, or may be stretched and dyed with iodine.
- the film can be stretched in an aqueous solution such as boric acid or potassium iodide or in a water bath.
- the liquid crystal panel of the present invention includes the first protective layer (not shown) between the first optical compensation layer 20 and the first polarizer 10, and the second optical compensation.
- a second protective layer is further provided between the layer 40 and the second polarizer 50.
- the liquid crystal panel of the present invention further includes a first protective layer between the first optical compensation layer 20 and the first polarizer 10, and
- a second protective layer is further provided between the second optical compensation layer 40 and the second polarizer 50.
- the first optical compensation layer 20 and the first protective layer, and the second optical compensation layer 40 and the second protective layer are directly laminated.
- the protective layer and the optical compensation layer can be directly laminated by applying and drying the material forming the optical compensation layer on the film constituting the protective layer.
- the first polarizer 10 and the first protective layer, and the second polarizer 50 and the second protective layer are stacked via any appropriate adhesive layer. Yes.
- the first protective layer and the second protective layer may have the same characteristics (for example, optical characteristics, mechanical characteristics, thermal characteristics) or different characteristics.
- the first protective layer and the second protective layer are the same. The improvement in color shift is a significant force.
- the first and second protective layers are preferably optimized for their optical properties. Specifically, the in-plane retardation A nd of the first and second protective layers
- l and A nd are each preferably 15 nm or less, more preferably lOnm or less, particularly preferably
- each of A nd and A nd is preferably Onm or more, more preferably 0.
- the protective layer (protective layer inside the polarizer) having the in-plane retardation And in the above range is combined with the specific optical compensation layer as described above and incorporated into the liquid crystal panel. As a result, the color shift can be made very small.
- a nd may be the same or different.
- a nd is the same. This is because the color shift is remarkably improved.
- the thickness direction retardations Rth and Rth of the first and second protective layers are respectively preferable.
- Rth and Rth are integers that are integers that are integers that are integers that are integers that are integers that are integers that are integers that are integers that are integers that are integers that are integers that are integers that are integers that are integers that are integers that are integers that are integers that are integers that are integers that are integers that are integers that are integers that are integers that are integers that are integers that are integers or less.
- Each of l 2 is preferably greater than or equal to Onm, and more preferably greater than Onm.
- the thickness direction retardations Rth and Rth of the first and second protective layers are preferably greater than or equal to Onm, and more preferably greater than Onm.
- At least one of l 2 is 30 nm or less. According to the present invention, the thickness within the above range
- a protective layer having a retardation Rth a protective layer inside the polarizer
- the specific optical compensation layer as described above into a liquid crystal panel, the color shift can be made extremely small.
- Rth and Rth may be the same or different
- Rth and Rth are the same. Because the color shift has improved significantly.
- any appropriate material can be adopted as the material of the first and second protective layers.
- a cellulose material and a norbornene material can be used.
- One of the preferred specific examples is composed of a film (cellulosic film) in which the first and second protective layers have a cellulosic material strength.
- the cellulose film any appropriate cellulose film is used as long as the effects of the present invention are obtained.
- the first and second protective layers may be made of the same cellulose film or different cellulose films.
- the first and second protective layers are preferably composed of the same cellulose film. This is because the color shift is remarkably improved.
- Specific examples of the cellulose material constituting the film include fatty acid-substituted cellulose polymers such as diacetyl cellulose and triacetyl cellulose.
- a cellulose-based film generally used as a transparent protective film for example, Fuji Photo Film Co., Ltd., trade name TF80UL
- a cellulose film subjected to appropriate processing for example, processing for reducing the thickness direction retardation (Rth)
- a commercially available cellulose film for example, trade name ZRF80S manufactured by Fuji Photo Film Co., Ltd.
- the thickness direction retardation (Rth) is controlled to be small may be used.
- any appropriate treatment method can be adopted as the treatment for reducing the thickness direction retardation (Rth).
- a base material such as polyethylene terephthalate, polypropylene, or stainless steel coated with a solvent such as cyclopentanone or methyl ethyl ketone is bonded to a general cellulose film and dried by heating (for example, about 80 to 150). 3 to 10 minutes), and then the base film is peeled off; a solution obtained by dissolving norbornene resin, acrylic resin, etc. in a solvent such as cyclopentanone, methyl ethyl ketone, etc.
- the fatty acid-substituted cellulose polymer is preferably a fatty acid-substituted cellulose polymer with a controlled degree of fatty acid substitution.
- the thickness direction phase difference (Rth) can be controlled to be small.
- a retardation in the thickness direction is added by adding a plasticizer such as dibutyl phthalate, p-toluenesulfonylide, and acetylacetyl thionate to the fatty acid-substituted cellulose polymer.
- a plasticizer such as dibutyl phthalate, p-toluenesulfonylide, and acetylacetyl thionate
- Rth can be controlled small.
- the amount of the plasticizer added is preferably 40 parts by weight or less, more preferably 1 to 20 parts by weight, and most preferably 1 to 15 parts by weight with respect to 100 parts by weight of the fatty acid-substituted cellulose polymer.
- first and second protective layers are acrylic resin films. Both the first and second protective layers may be acrylic resin films, or only one of them may be an acrylic resin film. When both the first and second protective layers are acrylic resin films, they may be the same acrylic resin film or different acrylic resin films.
- an acrylic resin containing an acrylic resin (A) containing a dartaric anhydride unit represented by the following structural formula (24) described in JP-A-2005-314534 as a main component is preferable. It is a fat film. Heat resistance can be improved by containing a dartal anhydride unit represented by the following structural formula (24).
- R ⁇ R 2 represents a same or different hydrogen atom or an alkyl group having a carbon number of 1-5, preferably a hydrogen atom or a methyl group, more preferably in methylation group .
- the content of the dartaric anhydride unit represented by the structural formula (24) is preferably 20 to 40 wt%, more preferably 25 to 35 wt%. is there.
- the acrylic resin (A) may contain one or more arbitrary monomer units in addition to the dartaric anhydride unit represented by the structural formula (24).
- a monomer unit a carboxylic acid alkyl ester unit is preferable.
- the content ratio of vinyl carboxylic acid alkyl ester unit is preferably 60 to 80 weight 0/0, more preferably 65 to 75 weight 0/0.
- berylcarboxylic acid alkyl ester units include units represented by the following general formula (25).
- R 3 represents a hydrogen atom or an aliphatic or alicyclic hydrocarbon having 1 to 5 carbon atoms
- R 4 represents an aliphatic hydrocarbon having 1 to 5 carbon atoms.
- the acrylic resin (A) preferably has a weight average molecular weight of 80000 to 150000.
- the content of the acrylic resin (A) in the acrylic resin film is preferably 60 to 90% by weight.
- the acrylic resin film may contain one or more arbitrary suitable components.
- a component any appropriate component can be adopted as long as the object of the present invention is not impaired.
- a resin other than the above acrylic resin (A) an ultraviolet absorber, an antioxidant, a lubricant, a plasticizer, a mold release agent, a coloring inhibitor, a flame retardant, a nucleating agent, an antistatic agent, a pigment, a coloring agent, etc.
- the thickness of the first and second protective layers is arbitrary as long as a desired thickness direction retardation (Rth) is obtained and the mechanical strength as the protective layer (protective film) is maintained. Any suitable thickness may be employed.
- the thickness of each of the first and second protective layers is preferably 1 to 500 m, more preferably 5 to 200 m, particularly preferably 20 to 200 ⁇ m, and particularly preferably 30 to: LOO ⁇ m, most preferably 35 to 95 ⁇ m.
- the thicknesses of the first and second protective layers may be the same or different.
- the thickness of the first and second protective layers is the same. This is because the color shift is remarkably improved.
- another protective layer (not shown) is provided outside the first polarizer 10 (viewing side in the example shown), and outside the second polarizer 50 (backlight side in the example shown).
- another protective layer (not shown) is provided. Since these outer protective layers do not affect the optical compensation, it is not necessary to optimize the optical properties. Therefore, any appropriate protective layer can be adopted as the outer protective layer depending on the purpose.
- the outer protective layer also has a plastic film force that is excellent in transparency, mechanical strength, thermal stability, moisture barrier properties, isotropic properties, and the like.
- the resin constituting the plastic film include acetate resin such as triacetyl cellulose (TAC), polyester resin, polyether sulfone resin, polysulfone resin, polycarbonate resin, polyamide resin, and polyimide resin.
- TAC triacetyl cellulose
- Polyolefin resin acrylic resin, polynorbornene resin, cellulose resin, polyarylate resin, polystyrene resin, polybutyl alcohol resin, polyacrylic resin, and mixtures thereof.
- thermosetting resins such as acrylic, urethane, acrylic urethane, epoxy, and silicone, or ultraviolet curable resins may be used. From the viewpoint of polarization characteristics and durability, a TAC film whose surface is subjected to a ken treatment with alkali or the like is preferable.
- a polymer film having a resin composition force as described in JP-A-2001-343529 can be used for the outer protective layer. More specifically, a mixture of a 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 a cyan group in the side chain. It is. Specific examples include isobutene and N-methylenemaleimide. Examples of the resin composition include an alternating copolymer and an acrylonitrile / styrene copolymer. For example, an extruded product of such a resin composition can be used.
- the outer protective layer is preferably transparent and uncolored.
- the thickness direction retardation Rth force of the outer protective layer is preferably 90 nm to +75 nm, more preferably 80 nm to +60 nm, and most preferably 1 nm to +45 nm.
- the retardation Rth force in the thickness direction of the outer protective layer In such a range, the optical coloring of the polarizer caused by the outer protective layer can be eliminated.
- the thickness of the outer protective layer may be appropriately set according to the purpose.
- the thickness of the outer protective layer is typically 500 ⁇ m or less, preferably 5 to 300 ⁇ m, more preferably 5 to 150 ⁇ m.
- any appropriate surface treatment can be applied to the surface of the outer protective layer to which the polarizer is not adhered.
- Specific examples of the surface treatment include hard coat treatment, antireflection treatment, sticking prevention treatment, and diffusion treatment (also referred to as antiglare treatment).
- the above hard coat treatment is performed for the purpose of preventing scratches on the surface of the polarizing plate.
- a cured film excellent in hardness, sliding properties, etc. by an appropriate ultraviolet curable resin such as acrylic or silicone is used. It can be formed on the surface of the protective layer.
- the antireflection treatment is performed for the purpose of preventing reflection of external light on the surface of the polarizing plate.
- the anti-sticking process is performed for the purpose of preventing adhesion with an adjacent layer.
- the anti-glare treatment is applied for the purpose of preventing the external light from being reflected on the surface of the polarizing plate and obstructing the visibility of the light transmitted through the polarizing plate.
- a roughening method using a sandblasting method or an embossing method can be formed by imparting a fine concavo-convex structure to the surface of the protective layer by an appropriate method such as a compounding method of transparent fine particles.
- the anti-damper layer formed by the anti-glare may also serve as a diffusion layer (viewing angle expanding function or the like) for diffusing the light transmitted through the polarizing plate to expand the viewing angle.
- a liquid crystal display device includes the liquid crystal panel of the present invention.
- Arbitrary appropriate components are adopted for the components other than the liquid crystal panel.
- the liquid crystal display device of the present invention includes the liquid crystal panel of the present invention and the liquid.
- a treatment layer subjected to the above hard coat treatment, antireflection treatment, antisticking treatment, diffusion treatment (antiglare treatment) or the like is used as the surface treatment layer.
- the surface treatment layer may be formed by subjecting the outer protective layer to a surface treatment.
- the refractive indices nx , ny and nz of the sample film are measured with an automatic birefringence measuring device (manufactured by Oji Scientific Instruments Co., Ltd., automatic birefringence meter KOBRA21—ADH), and the in-plane retardation ⁇ nd and thickness direction position are measured.
- the phase difference Rth was calculated. Measurement temperature was 23 ° C, measurement wavelength was 590nm
- ELDIM's product name ⁇ EZ Contrastl60D '' measure the color tone of the liquid crystal display device by changing the polar angle from 0 ° to 80 ° at azimuth angles of 30 °, 45 ° and 60 °. Plotted on a chromaticity diagram. Furthermore, in the polar angle 60 ° direction, the azimuth was changed from 0 ° to 60 °, the X and y values were measured, and the relationship between the azimuth and the X and y values was plotted.
- This polyimide solution is applied to a triacetyl cellulose (TAC) film (trade name: ZRF80S, manufactured by Fuji Photo Film Co., Ltd., trade name: 80 ⁇ m) with a small retardation at a thickness of 22 ⁇ m, and dried at 120 ° C for 5 minutes.
- TAC film triacetyl cellulose
- the film was stretched laterally.
- the in-plane retardation of the laminate obtained by stretching was 43 nm, and the thickness direction retardation was 192 nm.
- the in-plane retardation was 4 nm and the thickness direction retardation was 20 nm.
- the retardation of the optical compensation layer was calculated from the difference between the retardation of the laminate and the retardation of the substrate.
- the in-plane retardation of the optical compensation layer was 39 nm, and the thickness direction retardation was 172 nm.
- the Nz coefficient of the optical compensation layer was 4.4.
- a polarizer was produced by uniaxially stretching 6 times between rolls having different speed ratios in an aqueous solution containing boric acid.
- This polarizer and the laminate were bonded together with an adhesive.
- the substrate (protective layer) and the polarizer were bonded so as to be adjacent to each other.
- the polarizer was bonded so that the absorption axis (stretching axis) of the polarizer and the slow axis (stretching axis) of the optical compensation layer were orthogonal to each other.
- the laminated body was bonded, and a commonly used TAC film (manufactured by Fuji Photo Film Co., Ltd., trade name: TF80UL, thickness 80 m) was bonded to the surface of the polarizer via an adhesive.
- a commonly used TAC film manufactured by Fuji Photo Film Co., Ltd., trade name: TF80UL, thickness 80 m
- an outer protective layer generally TAC film
- inner protective layer small retardation TAC film
- Z polarizing plate integrated laminate having the structure of an optical compensation layer (polyimide layer) Got. Two sheets of this polarizing plate integrated laminate were produced.
- a liquid crystal panel (trade name BenQ DV3250, 32 inches, VA mode, manufactured by AUO) was used to remove the liquid crystal cell.
- the two polarizing plate-integrated laminates were bonded to both sides of the liquid crystal cell with an adhesive so that the outer protective layer was the outermost layer.
- the polarizers were bonded so that the absorption axes of the respective polarizers were orthogonal to each other. In this way, a liquid crystal panel was obtained.
- the color shift of this liquid crystal panel was measured.
- Fig. 4 shows the relationship between the X and y values and the azimuth
- Fig. 5 shows the xy chromaticity diagram.
- (X, Y Table 1 shows the M straight, (Xi, Yi) value, ⁇ value, (u,, v,) value, (u 'i, v, i) value, ⁇ ⁇ ' v, value.
- the ⁇ value is expressed by the following formula (A), which is the most distant from the chromaticity (X, Y) when viewed from the normal direction of the liquid crystal cell, and (X, Y) on the chromaticity diagram. The distance to the point (Xi, Yi) is shown. The larger this value, the greater the color shift.
- the ⁇ ⁇ ' ⁇ 'value is expressed by the following formula ( ⁇ ), and the chromaticity (u', ⁇ ') when observed from the normal direction of the liquid crystal cell, and (u', The distance to the point (u 'i, v' i) farthest from V) is shown. The larger this value, the greater the color shift.
- ⁇ ⁇ V ⁇ (u, -u 'i) 2 + (v, -v' i) 2 ⁇ 1/2 ⁇ ⁇ ⁇ (B)
- a polyimide solution similar to that in Example 1 was applied to a commonly used TAC film (manufactured by Fuji Photo Film Co., Ltd., trade name: TF80UL, thickness: 80 ⁇ m) at a thickness of 32 ⁇ m, 120. It was dried at C for 5 minutes to obtain a laminate having a base material (TAC film: finally becomes a protective layer) and an optical compensation layer (thickness 3.2 m). This laminate was stretched transversely at 165 ° C by 1.27 times. The in-plane retardation of the laminate obtained by stretching was 38 nm, and the thickness direction retardation was 144 nm.
- the in-plane retardation was lOnm and the thickness direction retardation was 60 nm.
- the phase difference of the optical compensation layer was calculated based on the difference between the phase difference of the laminate and the phase difference of the base material.
- the in-plane retardation of the optical compensation layer was 28 nm, and the thickness direction retardation was 84 nm.
- the Nz coefficient of the optical compensation layer was 3.
- a polarizer was produced in the same manner as in Example 1. This polarizer and the laminate were bonded together with an adhesive.
- the substrate (protective layer) and the polarizer were bonded so as to be adjacent to each other. Further, the polarizer was bonded so that the absorption axis (stretching axis) of the polarizer and the slow axis (stretching axis) of the optical compensation layer were perpendicular to each other. Further, a commonly used TAC film (manufactured by Fuji Photo Film Co., Ltd., trade name: TF80UL, thickness 80 m) was bonded to the surface of the polarizer to which the laminate was not bonded via an adhesive.
- TAC film manufactured by Fuji Photo Film Co., Ltd., trade name: TF80UL, thickness 80 m
- a polarizing plate integrated laminate having the structure of the outer protective layer (general TAC film) Z polarizer Z inner protective layer (general TAC film) Z optical compensation layer (polyimide layer) is obtained. It was. Two sheets of this polarizing plate integrated laminate were produced.
- the liquid crystal cell was taken out from the liquid crystal panel (manufactured by Sharp Corporation, trade name: ATAOS, 32 inches, VA mode).
- the two polarizing plate-integrated laminates were bonded to both sides of the liquid crystal cell via an adhesive. At this time, the polarizers were bonded so that the absorption axes of the polarizers were orthogonal to each other. In this way, a liquid crystal panel was obtained. The power error shift was measured for this liquid crystal panel.
- Figure 6 shows the relationship between the X and y values and the azimuth. Furthermore, (X, ⁇ ) value, (Xi, Yi) value, ⁇ value, (u, v,) value, (u, i, v, i) value, ⁇ ⁇ ' ⁇ ' Values are shown in Table 1 above.
- Example 2 Apply the same polyimide solution as in Example 1 to a commonly used TAC film (Fuji Photo Film, trade name: TF80UL, thickness: 80 ⁇ m) to a thickness of 31 ⁇ m, 120.
- the laminate was dried at C for 5 minutes to obtain a laminate having a substrate (TAC film: finally becomes a protective layer) and an optical compensation layer (thickness 3.1 m).
- This laminate was stretched 1.160 times at 160 ° C.
- the in-plane retardation of the laminate obtained by stretching was 55 nm, and the thickness direction retardation was 260 nm.
- the in-plane retardation was 10 nm and the thickness direction retardation was 60 nm.
- the phase difference of the optical compensation layer was calculated based on the difference between the phase difference of the laminate and the phase difference of the base material.
- the in-plane retardation of the optical compensation layer was 45 nm, and the thickness direction retardation was 200 nm. Furthermore, the Nz coefficient of the optical compensation layer was 4.4.
- a liquid crystal panel (trade name BenQ DV3250, 32 inches, VA mode, manufactured by AUO) was removed from the liquid crystal cell.
- the above polarizing plate integrated laminate is provided on one side of the liquid crystal cell, and a commercially available polarizing plate (product name: SEG1224, manufactured by Nitto Denko Corporation) having a TACZ polarizer ZTAC structure is provided on the other side. Pasted through. At this time, they were bonded so that the absorption axes of the respective polarizers were orthogonal to each other. In this way, a liquid crystal panel was obtained. The color shift of this liquid crystal panel was measured.
- Fig. 7 shows the relationship between the X and y values and the azimuth
- Example 120 Apply the same polyimide solution as in Example 1 to a TAC film (Fuji Photo Film, trade name: ZRF80S, thickness: 80 ⁇ m) with a small retardation of 42 ⁇ m.
- the laminate was dried at C for 5 minutes to obtain a laminate having a substrate (TAC film: finally becomes a protective layer) and an optical compensation layer (thickness 4.2 ⁇ ).
- This laminate was stretched by 1.2 times at 155 ° C.
- the in-plane retardation of the laminate obtained by stretching was 55 nm, and the thickness direction retardation was 245 nm.
- the in-plane phase difference was 4 nm and the thickness direction phase difference was 20 nm.
- the phase difference of the optical compensation layer was calculated based on the difference between the phase difference of the laminate and the phase difference of the substrate.
- the in-plane retardation of the optical compensation layer was 51 nm, and the thickness direction retardation was 225 nm.
- the Nz coefficient of the optical compensation layer was 4.4.
- a liquid crystal panel (trade name BenQ DV3250, 32 inches, VA mode, manufactured by AUO) and a liquid crystal cell were taken out.
- the above polarizing plate integrated laminate is provided on one side of the liquid crystal cell, and a commercially available polarizing plate (product name: SEG1224, manufactured by Nitto Denko Corporation) having a TACZ polarizer ZTAC structure is provided on the other side. Pasted through. At this time, Bonding was performed so that the absorption axes of the photons were orthogonal. In this way, a liquid crystal panel was obtained.
- Example 2 Apply the same polyimide solution as in Example 1 to a commonly used TAC film (Fuji Photo Film, trade name: TF80UL, thickness: 80 ⁇ m) to a thickness of 31 ⁇ m, 120.
- the laminate was dried at C for 5 minutes to obtain a laminate having a substrate (TAC film: finally becomes a protective layer) and an optical compensation layer (thickness 3.1 m).
- This laminate was stretched 1.160 times at 160 ° C.
- the in-plane retardation of the laminate obtained by stretching was 50 nm, and the thickness direction retardation was 270 nm.
- the in-plane retardation was 10 nm and the thickness direction retardation was 60 nm.
- the phase difference of the optical compensation layer was calculated based on the difference between the phase difference of the laminate and the phase difference of the base material.
- the in-plane retardation of the optical compensation layer was 40 nm, and the thickness direction retardation was 210 nm. Furthermore, the Nz coefficient of the optical compensation layer was 5.3.
- the liquid crystal cell was taken out of the liquid crystal panel (manufactured by Sharp Corporation, trade name: ATAOS, 32 inches, VA mode).
- the above polarizing plate integrated laminate is provided on one side of the liquid crystal cell, and a commercially available polarizing plate (product name: SEG1224, manufactured by Nitto Denko, Inc.) having a TACZ polarizer ZTAC structure is provided on the other side. Pasted through.
- the polarizers were bonded so that the absorption axes of the polarizers were orthogonal to each other. In this way, a liquid crystal panel was obtained. The color shift was measured with this liquid crystal panel.
- Figure 10 shows the relationship between the X and y values and the azimuth.
- the (X, Y) value, (Xi, Yi) value, ⁇ value, (u ,, ⁇ ') value, (u'i, v, i) value, ⁇ ' ⁇ , value It is shown in Table 1 above.
- the liquid crystal panel of Example 1 has a substantially constant color change tendency with respect to the polar angle regardless of the azimuth, whereas the liquid crystal panel of Comparative Example 1 The tendency of the color change with respect to the polar angle varies greatly depending on the azimuth angle. From this, it can be seen that the change in the color tone depending on the viewing direction is significantly smaller in the liquid crystal panel of Example 1 than in the liquid crystal panel of Comparative Example 1. Further, as is clear from FIGS. 4, 6, 7, 9, and 10, the liquid crystal panel of the example of the present invention has a curve of the X value with respect to the azimuth angle compared to the liquid crystal panel of the comparative example. The degree to which the y-value curve intersects is remarkably small!
- the liquid crystal panel and liquid crystal display device of the present invention include, for example, OA equipment such as a personal computer monitor, notebook computer, and copy machine; portable equipment such as a mobile phone, a clock, a digital camera, a personal digital assistant (PDA), and a portable game machine; Household electrical equipment such as video cameras, LCD TVs, and microwave ovens; Back monitors, car navigation system monitors, car-mounted equipment such as cardio; display equipment such as commercial store information monitors; Equipment: Used suitably for nursing care medical equipment such as nursing care monitors and medical monitors.
- OA equipment such as a personal computer monitor, notebook computer, and copy machine
- portable equipment such as a mobile phone, a clock, a digital camera, a personal digital assistant (PDA), and a portable game machine
- Household electrical equipment such as video cameras, LCD TVs, and microwave ovens
- Back monitors car navigation system monitors, car-mounted equipment such as cardio
- display equipment such as commercial store information monitors
- Equipment Used suitably for nursing care medical equipment such as nursing care
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/064,777 US20090279031A1 (en) | 2005-08-23 | 2006-08-09 | Liquid crystal panel and liquid crystal display apparatus using the same |
Applications Claiming Priority (4)
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JP2005-240587 | 2005-08-23 | ||
JP2005240587 | 2005-08-23 | ||
JP2006-056700 | 2006-03-02 | ||
JP2006056700 | 2006-03-02 |
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WO2007023673A1 true WO2007023673A1 (ja) | 2007-03-01 |
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PCT/JP2006/315712 WO2007023673A1 (ja) | 2005-08-23 | 2006-08-09 | 液晶パネルおよびそれを用いた液晶表示装置 |
Country Status (4)
Country | Link |
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US (1) | US20090279031A1 (ja) |
KR (1) | KR20080023751A (ja) |
TW (1) | TW200712695A (ja) |
WO (1) | WO2007023673A1 (ja) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
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WO2009081534A1 (ja) * | 2007-12-21 | 2009-07-02 | Sharp Kabushiki Kaisha | 液晶表示パネル、液晶表示装置、及び液晶表示パネルの製造方法 |
JP5546766B2 (ja) * | 2009-01-07 | 2014-07-09 | 日東電工株式会社 | 液晶パネルおよび液晶表示装置 |
JP2010243858A (ja) * | 2009-04-07 | 2010-10-28 | Nitto Denko Corp | 偏光板、液晶パネルおよび液晶表示装置 |
CN105659122B (zh) * | 2013-10-28 | 2018-11-16 | 日本瑞翁株式会社 | 多层膜、光学各向异性叠层体、圆偏振片、有机场致发光显示装置、以及制造方法 |
JP6839594B2 (ja) * | 2016-04-27 | 2021-03-10 | 日鉄ケミカル&マテリアル株式会社 | ポリイミドフィルム及び銅張積層板 |
JP6454756B2 (ja) * | 2017-06-02 | 2019-01-16 | 日東電工株式会社 | 液晶表示装置 |
Citations (1)
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JP2004046065A (ja) * | 2002-01-23 | 2004-02-12 | Nitto Denko Corp | 光学フィルム、積層偏光板、それらを用いた液晶表示装置および自発光型表示装置 |
Family Cites Families (4)
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US7038744B2 (en) * | 2002-01-09 | 2006-05-02 | Konica Corporation | Polarizing plate having a stretched film on a side thereof and liquid crystal display employing the same |
KR100591056B1 (ko) * | 2002-01-23 | 2006-06-22 | 닛토덴코 가부시키가이샤 | 광학 필름, 적층 편광판, 이들을 사용한 액정 표시 장치및 자발광형 표시 장치 및 광학필름의 제조방법 |
TW200305505A (en) * | 2002-02-19 | 2003-11-01 | Nitto Denko Corp | Stacked phase shift sheet, stacked polarizing plate including the same and image display |
JP4076454B2 (ja) * | 2002-04-19 | 2008-04-16 | 富士フイルム株式会社 | 光学補償シート、偏光板および画像表示装置 |
-
2006
- 2006-08-09 WO PCT/JP2006/315712 patent/WO2007023673A1/ja active Application Filing
- 2006-08-09 US US12/064,777 patent/US20090279031A1/en not_active Abandoned
- 2006-08-09 KR KR1020087001746A patent/KR20080023751A/ko not_active Application Discontinuation
- 2006-08-22 TW TW095130790A patent/TW200712695A/zh unknown
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JP2004046065A (ja) * | 2002-01-23 | 2004-02-12 | Nitto Denko Corp | 光学フィルム、積層偏光板、それらを用いた液晶表示装置および自発光型表示装置 |
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KR20080023751A (ko) | 2008-03-14 |
TW200712695A (en) | 2007-04-01 |
US20090279031A1 (en) | 2009-11-12 |
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