CN1942790A - Elliptical polarizing plate and image display - Google Patents
Elliptical polarizing plate and image display Download PDFInfo
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- CN1942790A CN1942790A CN 200580011692 CN200580011692A CN1942790A CN 1942790 A CN1942790 A CN 1942790A CN 200580011692 CN200580011692 CN 200580011692 CN 200580011692 A CN200580011692 A CN 200580011692A CN 1942790 A CN1942790 A CN 1942790A
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Abstract
The present invention provides an elliptical polarizing plate which is characterized in that an optical film comprising a lamination of a phase difference film (A) composed of a thermoplastic polymer containing a cyclic polyolefin resin, uniaxially oriented, and having a positive refractive index anisotropy (nx>nY nz) where nx, ny and nz are refractive indexes in the directions of the X-axis in which the in-plane refractive index is the greatest, the Y-axis perpendicular to the X-axis and the Z-axis in the thickness direction, and a phase difference film (B) fixed to homeotropic alignment and having a positive refractive index anisotropy (nz1>nx1 ny1) where nx1, ny1 and nz1 are refractive indexes in the directions of the X-axis in which the in-plane refractive index is the greatest, the Y-axis perpendicular to the X-axis and the Z-axis in the thickness direction is laminated on one side of a polarizer such that the delay axis of the phase difference film (A) and the absorption axis of the polarizer are perpendicular to each other. When the elliptical polarizing plate is employed in an in-plane switching active matrix liquid crystal display, lowering of contrast at a wide view angle can be suppressed and a high improvement effect of color shift is achieved.
Description
Technical field
The present invention relates to a kind of optical thin film and polariscope and carry out stacked ellipsoidal polarizing plate stacked phase-contrast film.In addition, the invention still further relates to image display devices such as the liquid crystal indicator that has used above-mentioned ellipsoidal polarizing plate, organic EL (electroluminescence) display device, PDP.Particularly, ellipsoidal polarizing plate of the present invention is applicable in the liquid crystal indicator of active array type of transverse electric field mode (IPS pattern).
Background technology
In the past, as liquid crystal indicator, mainly used between substrate opposite each other, to make liquid crystal reverse the liquid crystal indicator of the so-called TN pattern of horizontal alignment with positive dielectric constant anisotropy.But, in the TN pattern, aspect drive characteristic,, also can cause birefringence because of near the liquid crystal molecule the substrate even want to carry out black display, the result also can produce light and sew, and is difficult to carry out black display completely.With respect to this, the liquid crystal indicator of transverse electric field mode forms parallel electric field on the crystal liquid substrate between pixel electrode and the common electrode, carry out pixel shows, compare with the TN pattern mode that on substrate, forms vertical electric field etc., fully black display is possible, can obtain wide visual angle.
But, although in the active array type LCD of in the past transverse electric field mode, can on the panel normal direction, carry out black display almost completely, but observing under the situation of panel from the direction of off-normal direction, on the direction that departs from the optical axis direction that is disposed at liquid crystal cells polaroid up and down, occur on the characteristic of polaroid unavoidable light and sew, the result is that the visual angle narrows down, contrast reduces.In addition, during from oblique observation, the light path of light is elongated, and the apparent delay (retardation) of liquid crystal layer changes.So if change the visual angle, the light wavelength that then sees through changes, the color of visible picture changes, direction difference according to the observation, and produce gamut.
Disclose be used for the liquid crystal indicator of such transverse electric field mode suppress to depend on the visual angle contrast reduction or improve the various proposals (patent documentation 1, patent documentation 2) of gamut.For example, in patent documentation 1, proposed between a pair of polaroid of liquid crystal layer and this liquid crystal layer of clamping, folder is every the technology with optically anisotropic layer of compensation.This technology is being improved aspect the gamut effectively, but it is insufficient to suppress the reduction aspect of contrast.In addition, in patent documentation 2, proposed between a pair of polaroid of liquid crystal layer and this liquid crystal layer of clamping, folder is every the technology of the 1st and the 2nd polarizer.Put down in writing this technology in the reduction that suppresses contrast and improve aspect the gamut effectively, but needed the higher effect of improving.
Patent documentation 1: the spy opens flat 11-133408 communique
Patent documentation 2: the spy opens the 2001-242462 communique
Summary of the invention
The objective of the invention is to, a kind of stacked phase-contrast film and polariscopic ellipsoidal polarizing plate are provided, it is characterized in that, when being applied to the active array type LCD of transverse electric field mode, can suppress the reduction of the contrast in the wide visual angle, and gamut improve the effect height.
In addition, the present invention also aims to, the image display device that has used above-mentioned ellipsoidal polarizing plate is provided.The reduction that can suppress the contrast in the wide visual angle and the active array type LCD that improves the high transverse electric field mode of effect of gamut particularly are provided.
The inventor etc. concentrate on studies in order to solve above-mentioned problem, and it found that and utilizes the ellipsoidal polarizing plate shown in following can realize above-mentioned purpose, so that finish the present invention.
Promptly, the present invention relates to a kind of ellipsoidal polarizing plate, it is characterized in that, the optical thin film that is laminated by phase-contrast film A as described below and phase-contrast film B as described below is in a polariscopic side, mode with the slow axis of phase-contrast film A and polariscopic absorption axes quadrature is stacked, wherein: phase-contrast film A is made of the thermal plastic high polymer that contains cyclic polyolefin resin, Nei refractive index is an X-axis for maximum direction face to face, the direction vertical with X-axis is Y-axis, thickness direction is the Z axle, each axial refractive index is respectively nx, ny, during nz, has the positive refractive index anisotropy (nx＞ny nz) of one-way orientation; Phase-contrast film B is fixed to vertical orientated (Homeotropicalignement), and Nei refractive index is that X-axis, the direction vertical with X-axis are that Y-axis, thickness direction are that Z axle, each axial refractive index are respectively nx for maximum direction face to face
1, ny
1, nz
1The time, have positive refractive index anisotropy (nz
1＞nx
1 ny
1).
In the ellipsoidal polarizing plate of the invention described above, be laminated with phase-contrast film A and phase-contrast film B.Phase-contrast film A has the compensate function that the positive refractive index anisotropy of one-way orientation is produced, and phase-contrast film B can also control the phase differential of thickness direction.Like this, can suppress reduction, can improve gamut, can compensate wide visual angle based on the contrast of the polariscopic axle variation that produces by the variation at visual angle.
In addition, phase-contrast film A contains cyclic polyolefin resin.The photoelasticity modulus of cyclic polyolefin resin is little, particularly when being used for transverse electric field mode large-scale panels such as (IPS patterns), can be suppressed at incidental inequality in drawing stress or the endurancing etc.
In addition, the slow axis of the phase-contrast film A of ellipsoidal polarizing plate of the present invention and polariscopic absorption axes quadrature are stacked.Obtaining preferred aforesaid orthogonal configuration aspect the high contrast.
In addition, the optical thin film of stacked phase-contrast film A and phase-contrast film B is laminated on the polariscope, and optical thin film double as protective film so can realize slim, lightweight, can suppress the reduction of contrast, can also improve gamut, so preferred.
The angle of improving effect of the reduction of the contrast from can suppress wide visual angle and gamut, preferred above-mentioned ellipsoidal polarizing plate forms optical thin film according to the sequential cascade of polariscope, phase-contrast film A, phase-contrast film B.
In above-mentioned ellipsoidal polarizing plate, as above-mentioned phase-contrast film A, the preferred film that contains norbornene resin that uses.Contain outstanding etc. the angle of the permanance of film under high temperature, hot and humid condition of norbornene resin and set out, preferred.
In above-mentioned ellipsoidal polarizing plate, for the reduction and the gamut that suppress the contrast under the wide visual angle, phase-contrast film B is preferably, the phase differential of thickness direction: { ((nx
1+ ny
1)/2)-nz
1} * d (thickness: nm) be-500nm～-10nm.The phase differential of the thickness direction of above-mentioned phase-contrast film B more preferably-300nm～-30nm.And then be preferably-200nm～-50nm.
In above-mentioned ellipsoidal polarizing plate, as long as phase-contrast film B has above-mentioned refractive index, can be not particularly limited use, preferably contain the film of side chain liquid crystalline polymer.In addition, as the material of polarizer propyl ether B, can be illustrated as material that the refractive index in the face of draw direction diminishes, be so-called negative optical material.As such material, can enumerate phenylethylene resin series, acrylic resin etc.
In above-mentioned ellipsoidal polarizing plate,, can use λ/4 plates as phase-contrast film A.
And then, the invention still further relates to a kind of image display device, it is characterized in that, be laminated with above-mentioned ellipsoidal polarizing plate.As image display device, be preferred for liquid crystal indicator, being particularly preferred for drive pattern is the liquid crystal indicator of the active array type of transverse electric field mode (IPS) pattern.Use the image display device of the liquid crystal indicator etc. of this ellipsoidal polarizing plate can realize wide visual angleization, and when oblique side is observed display frame, can also suppress the reduction of contrast, can improve gamut.
Liquid crystal indicator can be by replacing polaroid in the past, ellipsoidal polarizing plate of the present invention is disposed at the one or both sides of liquid crystal cells and forms.Configuration to the relative liquid crystal cells of ellipsoidal polarizing plate of the present invention, be not particularly limited, from display quality, the optical thin film that has preferably made phase-contrast film A and phase-contrast film B stacked is positioned at liquid crystal cell side (being that above-mentioned optical thin film is between polariscope and liquid crystal cells), in liquid crystal indicator, be disposed between the polariscope of Nicol crossed, disposing above-mentioned optical thin film.In addition, in organic EL display, ellipsoidal polarizing plate is configured in metal electrode, but above-mentioned polariscope preferably is laminated in from liquid crystal cells or metal electrode position farthest.
Description of drawings
Fig. 1 is a mode of the sectional view and the concept map of ellipsoidal polarizing plate of the present invention.
Fig. 2 is a mode of the sectional view and the concept map of ellipsoidal polarizing plate of the present invention.
Fig. 3 is a mode of the concept map of liquid crystal indicator of the present invention.
Fig. 4 is the mode of concept map of the liquid crystal indicator of comparative example.
Among the figure, A: satisfy the phase-contrast film of nx＞ny nz, B: satisfy nz
1＞nx
1 ny
1Phase-contrast film, 1a: polariscope, 2: optical thin film, LC: liquid crystal cells.
Embodiment
Following one side sees figures.1.and.2, Yi Bian ellipsoidal polarizing plate of the present invention is described.As depicted in figs. 1 and 2, in the ellipsoidal polarizing plate of the present invention, the optical thin film 2 of stacked phase-contrast film A and phase-contrast film B is laminated in the one side of polariscope 1a.In addition, as depicted in figs. 1 and 2, can be at the opposite side stacked guard film 1b of polariscope 1a.It is represented as polaroid 1.The protective film of above-mentioned optical thin film 2 double as polariscope 1a.In addition, ellipsoidal polarizing plate tegillum of the present invention is stacked as the slow axis of phase-contrast film A and the absorption axes quadrature of polariscope 1a.
In ellipsoidal polarizing plate illustrated in figures 1 and 2, lamination order to above-mentioned optical thin film 2 relative polariscope 1a is not particularly limited, but in the time of in being installed in liquid crystal indicator, from the reduction of inhibition contrast and the angle of gamut, preferably from as shown in Figure 1 polariscope 1a, according to the sequential cascade of phase-contrast film A, phase-contrast film B.In addition, in Fig. 1 and Fig. 2, polariscope 1a, phase-contrast film A, phase-contrast film B are stacked by adhesive phase or adhesive layer.Adhesive phase or adhesive layer can be the reduplicative formses more than 1 layer or 2 layers.
The phase-contrast film A that uses is following film, promptly, when the refractive index in the pellicular front is made as the Z axle, when each axial refractive index is made as nx, ny, nz respectively, satisfies nx＞ny nz for maximum direction is made as the thickness direction that X-axis, the direction vertical with X-axis be made as Y-axis, film.That is, what use in the three-dimensional refractive index ellipsoid is, the refractive index of the main shaft of a direction is greater than showing positive unidirectional material on the refractive index of other 2 directions, the optics.
Phase-contrast film A can carry out unidirectional or two-way stretch is handled and obtained in the face direction by the thin polymer film that will be made of the thermal plastic high polymer that contains cyclic polyolefin resin.As cyclic polyolefin resin, for example can be illustrated as norbornene resin.
As norbornene resin, for example can enumerate open loop (being total to) polymkeric substance of (1) norborneol alkene monomer and then it is carried out maleic acid addition, cyclopentadiene addition etc. and the polymer modification thing that obtains, and then these are carried out hydrogenation and the resin that obtains; (2) make the norborneol alkene monomer carry out addition polymerization and the resin that obtains; (3) make ethylene series monomers such as norborneol alkene monomer and ethene or alpha-olefin carry out the add-on type copolymerization and resin of obtaining etc.Polymerization and method of hydrotreating can utilize usual way to carry out.
As above-mentioned norborneol alkene monomer, for example can enumerate norborene and alkyl thereof and/or alkylidene substituent, for example the polar group substituent of halogen of 5-methyl-2-norborene, 5-dimethyl-2-norborene, 5-ethyl-2-norborene, 5-butyl-2-norborene, 5-ethylidene-2-norborene etc. etc.; Bicyclopentadiene, 2,3-dihydro bicyclopentadiene etc.; Dimethano octahydro naphthalene, its alkyl and/or alkylidene substituent and halogen isopolarity base substituent, for example, 6-methyl isophthalic acid, 4:5,8-dimethano-1,4,4a, 5,6,7,8,8a-octahydro naphthalene, 6-ethyl-1,4:5,8-dimethano-1,4,4a, 5,6,7,8,8a-octahydro naphthalene, 6-ethylidene-1,4:5,8-dimethano-1,4,4a, 5,6,7,8,8a-octahydro naphthalene, 6-chloro-1,4:5,8-dimethano-1,4,4a, 5,6,7,8,8a-octahydro naphthalene, 6-cyano group-1,4:5,8-dimethano-1,4,4a, 5,6,7,8,8a-octahydro naphthalene, 6-pyridine radicals-1,4:5,8-dimethano-1,4,4a, 5,6,7,8,8a-octahydro naphthalene, 6-methoxyl carboxyl-1,4:5,8-dimethano-1,4,4a, 5,6,7,8,8a-octahydro naphthalene etc.; 3～4 aggressiveness of bicyclopentadiene for example can enumerate 4,9:5,8-dimethano-3a, 4,4a, 5,8,8a, 9,9a-octahydro-1H-fluorenes, 4,11:5,10:6,9-trimethano 3a, 4,4a, 5,5a, 6,9,9a, 10,10a, 11,11a-ten dihydros-1H-cyclopentadiene anthracene etc.
In the scope of not damaging purpose of the present invention, above-mentioned norbornene resin can and with other cyclenes hydro carbons that can ring-opening polymerization.As the object lesson of such cycloolefin, for example can enumerate cyclopentene, cyclooctene, 5,6-dihydro bicyclopentadiene etc. has the compound of 1 reactive pair of key.
Above-mentioned norbornene resin is to be 25,000～200,000, to be preferably 30,000～100,000, more preferably 40,000～80,000 scope by the number-average molecular weight (Mn) that the gel permeation chromatography that utilizes toluene solvant (GPC) method is measured.The physical strength aspect is outstanding if number-average molecular weight in above-mentioned scope, can be implemented in, the good purpose of operability of dissolubility, mouldability, curtain coating.
Above-mentioned norbornene resin for situation about obtaining to the ring opening copolymer thing hydrogenation of norborneol alkene monomer under, from the angle of resistance to thermal deterioration, fast light deterioration etc., using hydrogenation rate usually is material more than 90%.Be preferably more than 95%.More preferably more than 99%.
As the object lesson of the film that contains above-mentioned norbornene resin, for example can enumerate the ゼ ォ ノ ァ film of Japanese ゼ ォ Application corporate system or the ァ one ト Application film of JSR corporate system etc.
Reduce, improve and consider that ((nx-ny) * d (thickness: nm)) is that 50～210nm is effective to the front phase differential of phase-contrast film A aspect the gamut suppressing contrast.Above-mentioned front phase differential is preferably more than the 70nm, and then more than the 80nm, and then more than the 90nm.In addition, above-mentioned front phase differential is preferably below the 200nm, more preferably below the 190nm.Thickness (d) to phase-contrast film A is not particularly limited, and is preferably 1～200 μ m, and then is preferably 2～100 μ m.
Phase-contrast film B is fixed to vertical orientated, when the refractive index in the face is made as for maximum direction is made as X-axis, the direction vertical with X-axis that Y-axis, thickness direction are made as the Z axle, each axial refractive index is respectively nx
1, ny
1, nz
1The time, use be to satisfy positive refractive index anisotropy (nz
1＞nx
1 ny
1) film.Phase-contrast film B for example can obtain the liquid crystal material orientation by utilizing vertical-tropism agent.As making its vertical orientated liquid-crystal compounds, for example known nematic liquid crystal compound.About the general introduction of the orientation technology of this liquid-crystal compounds, for example on the books in chemistry summary 44 (improvement on surface, Japanization association compiles, 156～163 pages).
In addition, as above-mentioned liquid crystal material, for example can utilize have that positive refractive index is anisotropic, the side chain liquid crystalline polymer of the monomeric unit (a) that contains liquid crystal liquid crystal property segment side chain and the monomeric unit (b) that contains non-liquid crystal liquid crystal property segment side chain forms.Even above-mentioned side chain liquid crystalline polymer does not use vertical alignment layer can realize the vertical orientated of liquid crystal polymer yet.
Above-mentioned monomeric unit (a) is the unit that comprises the side chain with nematic crystal, for example can enumerate general formula (a)
[changing 1]
(wherein, R
1Expression hydrogen atom or methyl, a represents 1～6 positive integer, X
1Expression-CO
2-Ji or-the OCO-base, R
2The alkyl of the alkoxy of expression cyano group, carbon number 1～6, fluorine-based or carbon number 1～6, b and c represent 1 or 2 integer.) expression monomeric unit.
In addition, monomeric unit (b) for example can be enumerated general formula (b) for having the unit of straight chain shape side chain:
[changing 2]
(wherein, R
3Expression hydrogen atom or methyl, R
4The alkyl of expression carbon number 1～22, the fluoro-alkyl or the general formula (b1) of carbon number 1～22:
[changing 3]
Wherein, d represents 1～6 positive integer, R
5The alkyl of expression carbon number 1～6.) expression monomeric unit.
In addition, monomeric unit (a) is not limited especially with the ratio of monomeric unit (b), according to the kind of monomeric unit and difference, if but the ratio of monomeric unit (b) is too much, side chain liquid crystalline polymer does not show liquid crystal single domain orientation, so preferred (b)/{ (a)+(b) }=0.01～0.8 (mol ratio).Especially more preferably 0.1～0.5.
In addition, as the liquid crystal polymer that can form vertical orientated liquid crystal film, can enumerate the monomeric unit (a) that contains above-mentioned liquid crystal liquid crystal property segment side chain and contain the side chain liquid crystalline polymer of the monomeric unit (c) of liquid crystal liquid crystal property segment side chain with alicyclic ring texture.
Above-mentioned monomeric unit (c) is the unit with side chain of nematic crystal, for example can enumerate general formula (c):
[changing 4]
(wherein, R
6Expression hydrogen atom or methyl, h represents 1～6 positive integer, X
2Expression-CO
2-Ji or-the OCO-base, e and g represent 1 or 2 integer, f represents 0～2 integer, R
7The alkyl of expression cyano group, carbon number 1～12.) expression monomeric unit.
In addition, monomeric unit (a) is not limited especially with the ratio of monomeric unit (c), according to the kind of monomeric unit and difference, but monomeric unit (c) if ratio too much, side chain liquid crystalline polymer does not show liquid crystal single domain orientation, so preferred (c)/{ (a)+(c) }=0.01～0.8 (mol ratio).Especially more preferably 0.1～0.6.
The liquid crystal polymer that can form phase-contrast film B is not limited to have the liquid crystal polymer of above-mentioned illustrative monomeric unit, and above-mentioned in addition illustration monomeric unit can also appropriate combination.
The weight-average molecular weight of above-mentioned side chain liquid crystalline polymer (GPC) is preferably 2,000～100,000.By weight-average molecular weight being adjusted in this scope, can bring into play performance as liquid crystal polymer.If the weight-average molecular weight of side chain liquid crystalline polymer is very few, the tendency of the film forming shortage of oriented layer is arranged, so weight-average molecular weight is more preferably more than 2.5 thousand.On the other hand, if weight-average molecular weight is too much, then there is orientation as liquid crystal to lack, be difficult to form the tendency of the state of orientation of homogeneous, so weight-average molecular weight is more preferably below 50,000.
In addition, above-mentioned illustrative side chain liquid crystalline polymer can be modulated by the acrylic monomer or the metha crylic monomer of the corresponding above-mentioned monomeric unit (a) of copolymerization, monomeric unit (b), monomeric unit (c).In addition, the monomer of corresponding monomeric unit (a), monomeric unit (b), monomeric unit (c) can be synthetic by known method.The modulation of multipolymer for example can be carried out based on the polymerization methods of acrylic monomer of general rules such as radical polymerization mode, cationic polymerization mode, anionic polymerisation mode etc.In addition, be suitable under the situation of radical polymerization mode, can use various polymerization initiators, but wherein preferably use azobis isobutyronitrile or dibenzoyl peroxide etc. to decompose the high nor not low polymerization initiator of temperature with the medium temperature decomposition.
In above-mentioned side chain liquid crystalline polymer, can cooperate the optical polymerism liquid-crystal compounds and use as liquid crystalline composition.The optical polymerism liquid-crystal compounds is to have 1 liquid crystal compounds as the unsaturated double-bond such as for example acryloyl group or methacryl etc. of optical polymerism functional group at least, and deflection is used the liquid crystal compounds of nematic crystal.As this optical polymerism liquid-crystal compounds, can illustration become the acrylate or the methacrylate of above-mentioned monomeric unit (a).As the optical polymerism liquid-crystal compounds,, preferably have 2 above optical polymerism functional groups in order to improve permanance.As such optical polymerism liquid-crystal compounds, for example can the following chemical formula 5 of illustration:
[changing 5]
(in the formula, R represents hydrogen atom or methyl, and A and D are independently of one another, expression 1,4-phenylene or 1,4-cyclohexylidene, X is independently of one another, expression-COO-base ,-the OCO base-or-the O base-, B represents 1,4-phenylene, 1,4-cyclohexylidene, 4,4 '-biphenylene or 4,4 '-two inferior cyclohexyls, m and n are independently of one another, the integer of expression 2～6.) cross-linking type of expression is to the row liquid crystal monomer etc.In addition, as the optical polymerism liquid-crystal compounds, can be illustrated as " H with the end in above-mentionedization 5
2C=CR-CO
2-" be substituted by the compound of vinyl ether group or epoxy radicals, or with " (CH
2)
m-" and/or " (CH
2)
n-" be substituted by " (CH
2)
3-C
*H (CH
3)-(CH
2)
2-" or " (CH
2)
2-C
*H (CH
3)-(CH
2)
3-" compound.
Above-mentioned optical polymerism liquid-crystal compounds, by thermal treatment, for example make its performance nematic crystal layer as mesomorphic state, take place vertical orientated with side chain liquid crystalline polymer, then, by polymerization or crosslinked optical polymerism liquid-crystal compounds, the permanance of vertical orientated liquid crystal film is improved.
The optical polymerism liquid-crystal compounds in the liquid crystalline composition and the ratio of side chain liquid crystalline polymer are not limited especially, can consider the suitably decisions such as permanance of the vertical orientated liquid crystal film that obtains, but common preferred light polymerizable liquid crystal compound: side chain liquid crystalline polymer (weight ratio)=about 0.1: 1～30: 1, preferred especially 0.5: 1～20: 1, and then preferred 1: 1～10: 1.
In above-mentioned liquid crystalline composition, contain Photoepolymerizationinitiater initiater usually.Can use various Photoepolymerizationinitiater initiaters with being not particularly limited.As Photoepolymerizationinitiater initiater, for example can be illustrated as Irgacure907, Irgacure184, Irgacure651, the Irgacure369 etc. of the different chemical company of vapour Bart system.The addition of Photoepolymerizationinitiater initiater can be considered the kind of photopolymerizable liquid crystals compound, the match ratio of liquid crystalline composition etc., adds under the degree of the vertical orientated property that does not upset liquid crystalline composition.Usually, optical polymerism liquid-crystal compounds 100 weight portions are preferably about 0.5～30 weight portion relatively.Be preferably especially more than 3 weight portions.
The making of phase-contrast film B is by the vertical orientated property side chain liquid crystalline polymer of coating on substrate, is under the mesomorphic state at this side chain liquid crystalline polymer then, makes it vertical orientated, carries out keeping under this state of orientation immobilization.In addition, contain in use under the situation of the vertical orientated liquid crystalline composition that above-mentioned side chain liquid crystalline polymer and optical polymerism liquid-crystal compounds form, be by after being coated in it on substrate, be under the mesomorphic state then making this liquid crystalline composition, make it vertical orientated, carry out keeping under the state of its state of orientation rayed.
The substrate that applies above-mentioned side chain liquid crystalline polymer and liquid crystalline composition can be the arbitrary shape of glass substrate, metal forming, plastic plate or plastic sheeting.Plastic sheeting is not as long as change under the temperature of orientation, be not particularly limited, for example can enumerate by polyester based polymers such as polyethylene terephthalate, PENs, cellulose-based polymkeric substance such as cellulose diacetate, cellulose triacetate, the polycarbonate based polymer, the film that transparent polymers such as acrylic acid series polymeric compounds such as polymethylmethacrylate constitute.Also vertical alignment layer can be set on substrate.The thickness of substrate is generally about 10～1000 μ m.
The method of above-mentioned side chain liquid crystalline polymer of coating or liquid crystalline composition on substrate, can enumerate the solution coating method that use is dissolved in this side chain liquid crystalline polymer or liquid crystalline composition the solution in the solvent, or make the fusion coating method of this liquid crystal polymer or liquid crystalline composition fusion, wherein, preferably utilize the solution coating method, the method for the solution of coating side chain liquid crystalline polymer or liquid crystalline composition on supporting substrate.
Use above-mentioned solvent with its method of adjusting to the solution of the side chain liquid crystalline polymer of the concentration that needs or liquid crystalline composition as coating on substrate, for example, can adopt rolling method, gravure coating method, spin-coating method, excellent Tu Fa etc.After the coating, remove and desolvate, on substrate, form liquid crystalline polymer layer or liquid crystalline composition layer.Remove the condition of desolvating and do not limited especially, can roughly remove and desolvate, as long as liquid crystalline polymer layer or liquid crystalline composition layer do not take place to flow or wander.Usually, utilizing at room temperature drying, the drying in drying oven, the heating on hot plate etc. to remove desolvates.In these coating methods, the gravure coating method that the present invention adopts, from the angle of the easy coating of large tracts of land equably, preferred.
Then, making the side chain liquid crystalline polymer layer or the liquid crystalline composition layer that form on the supporting substrate is mesomorphic state, makes it vertical orientated.For example, heat-treat, make side chain liquid crystalline polymer or liquid crystalline composition, under mesomorphic state, make it vertical orientated at liquid crystal temperature range.As heat treatment method, can carry out with the method identical with above-mentioned drying means.Heat treatment temperature, different according to the side chain liquid crystalline polymer or the liquid crystalline composition that use with the kind of supporting substrate, so cannot treat different things as the same, in 60～300 ℃, preferred 70～200 ℃ scope, carry out usually.In addition, heat treatment time according to the kind of the side chain liquid crystalline polymer of heat treatment temperature and use or liquid crystalline composition or substrate and different, cannot treat different things as the same, and selects 10 seconds～2 hours, preferred 20 seconds～30 minutes scope usually.In short-term may not can fully carry out in 10 seconds by vertical orientated formation for ratio.At these orientation temperatures, in its processing time, the present invention is from the angle of operability, mass production, 80～150 ℃ of preferred orientation temperature of the present invention, and its processing time carries out about 30 seconds～10 minutes.
After thermal treatment finishes, carry out cooling down operation.As cooling down operation, can be undertaken by the heating environment of vertical orientated liquid crystal film from heat treatment operation after the thermal treatment is fetched in the room temperature.In addition, can carry out air cooling, water-cooled etc. again and force cooling.Be cooled to below the glass temperature of side chain liquid crystalline polymer by vertical orientated layer, make the orientation immobilization above-mentioned side chain liquid crystalline polymer.
During liquid crystalline composition, to being carried out rayed by immobilized so vertical orientated liquid crystal aligning layer, make optical polymerism liquid-crystal compounds polymerization or crosslinked, immobilization optical polymerism liquid-crystal compounds obtains the vertical orientated liquid crystal film layer that permanance improves.Rayed is for example undertaken by the ultraviolet ray irradiation.In order to promote reaction fully, ultraviolet illuminate condition is preferably in the inert gas atmosphere.Usually representative be to use about 80～160mW/cm
2The high-pressure mercury uviol lamp of illumination.Can use other kind lamps such as メ Ha ラ ィ De UV lamp or incandescent lamp again.In addition, utilize processing such as cold mirror, water-cooled and other cooling or quickening linear velocity, the liquid crystal layer surface temperature during with irradiation ultraviolet radiation suitably is adjusted in the liquid crystal temperature range.
Like this, generate the film of side chain liquid crystalline polymer or liquid crystalline composition,, obtain phase-contrast film B by immobilization under the state of keeping orientation.Thickness to vertical orientated liquid crystal film of the present invention is not particularly limited, and the thickness of the coated vertical orientated liquid crystal film layer that is made of above-mentioned side chain liquid crystalline polymer is preferably about 0.3～200 μ m, and then is preferably 0.5～200 μ m.If below 0.3 μ m, film thickness is thin excessively, so be difficult to control thickness.When surpassing 200 μ m, when being installed on image display device, extended orientation, visual angle is up and down arranged, opposite on the other hand, the orientation that narrows down sometimes.Phase-contrast film B can be from strippable substrate, or does not use from strippable substrate.
The stacked of phase-contrast film A and phase-contrast film B can be used adhesive phase or adhesive layer.The material that forms adhesive phase or adhesive layer is not particularly limited, for example can suits to select to use with the material of polymkeric substance such as acrylic acid series polymeric compounds, silicone-based polymkeric substance, polyester, polyurethane, polyamide, polyethers, fluorine system or rubber system as raw polymer.Especially preferably use outstanding bonding agents such as the transparency on the optics of acrylic adhesive and so on is outstanding, the adhesion characteristic that shows suitable wetting state and compendency and tackiness, against weather, thermotolerance.
The formation of adhesive phase or adhesive layer can utilize suitable mode to carry out.As its example, for example can enumerate by separately or in the solvent that constitutes of potpourri of appropriate solvent such as toluene or ethyl acetate, dissolving or raw material dispersion polymkeric substance or its composition, solution about modulation 10～40 weight %, utilize suitable expansion modes such as curtain coating mode or application pattern, on aforesaid substrate or liquid crystal film, directly set up the mode of this solution,, it is transferred to mode on the above-mentioned liquid crystal layer etc. perhaps according to above-mentioned adhesive phase or the adhesive layer of on separator, forming.
In addition, in adhesive phase or adhesive layer, for example also can contain adjuvants such as natural or synthetic resin, particularly tackifying resin or the filling agent that constitutes by glass fibre, beaded glass, metal powder, other inorganic powder etc., pigment, colorant, antioxidant.Also can contain particulate in addition and give light diffusing.
The thickness of adhesive phase or adhesive layer can suitably be determined according to application target or bonding force etc., be generally 1～500 μ m, preferred 5～200 μ m, preferred especially 10～100 μ m.
For the face that exposes of adhesive phase or adhesive layer, supplying before practical in order to prevent that it from polluting, and can paste separator and cover temporarily.Can prevent the phenomenon that under common mode of operation, contacts thus with adhesive phase or adhesive layer.As separator, on the basis of satisfying above-mentioned thickness condition, for example can use as required with suitable removers such as silicone-based or chain alkyl system, fluorine system or molybdenum sulfides plastic sheeting, sheet rubber, paper, cloth, nonwoven fabrics, net, foam sheet or metal forming, their suitable thin slice bodies such as duplexer are applied suitable separators commonly used in the past such as material after the processing.
Also have, also can be on each layers such as above-mentioned optical thin film, adhesive phase or adhesive layer, utilize the modes such as mode of for example using salicylate based compound or phenol (benzophenol) based compound, benzotriazole based compound or ultraviolet light absorbers such as cyanoacrylate based compound, nickel coordination compound based compound to handle, make it to have ultraviolet absorption ability etc.
Polariscope is not particularly limited, can uses various polariscopes.As polariscope, for example can enumerate, divide on the hydrophilic macromolecule film such as saponification film the material of dichroic substance such as absorption iodine or dichroic dye and unilateral stretching at polyvinyl alcohol film, part dimethoxym ethane polyvinyl alcohol film, ethylene-vinyl acetate copolymer pastern; Polyenes such as the desalination acid treatment thing of the processed thing of polyvinyl alcohol (PVA) or Polyvinylchloride are oriented film etc.Wherein, preferably stretching polyethylene alcohol is the polariscope that film, absorption orientation dichroic material (iodine, dyestuff) form.There is no particular limitation to polariscopic thickness, but be generally about about 5～80 μ m.
Polyvinyl alcohol film of iodine staining and the polariscope that forms through unilateral stretching, for example, after can dyeing by the aqueous solution that polyvinyl alcohol (PVA) be impregnated in iodine, is made for 3～7 times that are stretched to raw footage.As required, also can impregnated in the aqueous solution of boric acid or potassium iodide etc.In addition, as required, also can be before dyeing polyvinyl alcohol film be impregnated in the water and wash.By the washing polyvinyl alcohol film, except can the lip-deep dirt of flush away polyvinyl alcohol film and anti blocking agent, can also prevent non-uniform phenomenons such as stain by making the polyvinyl alcohol film swelling.Stretch and both can after with iodine staining, carry out,, perhaps also can after stretching, dye with iodine on one side also can stretch by an Edge Coloring.Also can or stretch in the water-bath in the aqueous solution of boric acid or potassium iodide etc.
At the stacked above-mentioned optical thin film of a polariscopic side (phase-contrast film A or phase-contrast film B), has protective film usually at opposite side.The material that protective film is preferred to be used as polariscopic protective film usually and have good character in each side such as the transparency, physical strength, thermal stability, moisture shielding, isotropy.As the material of above-mentioned protective film, for example, can be exemplified as polyester based polymers such as polyethylene terephthalate or PEN; Cellulose-based polymkeric substance such as diacetyl cellulose or triacetyl cellulose; Acrylic acid series polymeric compounds such as polymethylmethacrylate; Polystyrene or acrylonitritrile-styrene resin styrenics such as (AS resins); Polycarbonate based polymer etc.In addition, as the example of the polymkeric substance that forms above-mentioned transparent protective film, can also be exemplified as tygon, polypropylene, polyolefin, the polyolefin polymkeric substance of ethylene-propylene copolymer and so on ring-type or norborene structure; Vinyl chloride-based polymer; Acid amides such as nylon or aromatic polyamide based polymer; The imide series polymkeric substance; The sulfone based polymer; The polyethersulfone based polymer; Polyethers-ether ketone based polymer; The polyphenylene sulfide based polymer; The vinyl alcohol based polymer, the vinylidene chloride based polymer; The polyvinyl butyral based polymer; The allylate based polymer; The polyoxymethylene based polymer; The epoxy based polymer; Perhaps above-mentioned mixture of polymers etc.Can also enumerate the protective film of filmings such as heat curing-type, ultraviolet curing resin such as making acrylic acid series, carbamate system, propenoic methyl carbamate system, epoxy system, silicone-based etc.
In addition, can enumerate the thin polymer film of opening in the 2001-343529 communique (WO 01/37007) record the spy, for example comprise (A) side chain have replace and/or not substituted imido thermoplastic resin and (B) have the resin combination of the thermoplastic resin of replacement and/or unsubstituted phenyl and itrile group at side chain.As instantiation, can be exemplified as the film of the resin combination that contains the alternating copolymer formed by isobutylene and N-methyl maleimide and acrylonitritrile-styrene resin.The film that can use mixing extruded product by resin combination etc. to constitute as film.
From the viewpoint of polarization characteristic and permanance, the transparent membrane that can especially preferably use is with alkali etc. the triacetylcellulose film that saponification is handled to be implemented on the surface.The thickness of transparent membrane can suitably determine, but from viewpoints such as operability, thin layer such as intensity or the property handled, be generally about 10～500 μ m.20～300 μ m more preferably, and then more preferably 30～200 μ m.
In addition, protective film had better not be painted.Therefore; the preferred Rth=[(nx+ny that uses)/and 2-nz] d is (wherein; nx, ny are the principal refractive indexs in the thin film planar, and nz is the refractive index of film thickness direction, and d is a film thickness) phase difference value of the film thickness direction of expression for-90nm～+ protective film of 75nm.Phase difference value (Rth) by using this thickness direction for-90nm～+ protective film of 75nm, can roughly eliminate painted (optical clouration) of the polaroid that causes by protective film.Thickness direction phase difference value (Rth) more preferably-80nm～+ 60nm, be preferably especially-70nm～+ 45nm.
Pass through adhesions such as water system tackifier at above-mentioned polariscope and protective film.As the water system tackifier, can illustration polyethenol series tackifier, gelatin is tackifier, ethene base system latex system, aqueous polyurethane, water system polyester etc.
As above-mentioned protective film, can carry out that hard conating or antireflection are handled, anti is handled, with diffusion or anti-dazzle be the processing of purpose.
Implement purpose that hard conating handles and be to prevent the surface distress of polaroid etc., method that for example can be by the curing tunicle that the additional hardness that is made of suitable ultraviolet curing resin such as acrylic acid series and silicone-based, sliding properties etc. are good on the surface of transparent protective film etc. forms.Implementing the purpose that antireflection handles is the outer reflection of light that prevents on the polaroid surface, can finish by forming to wait based in the past antireflective film.In addition, implementing purpose that anti handles is the adhesion that prevents with adjacent layer.
In addition; the purpose of implementing non-glare treated is to prevent that outer light from disturbing the identification of polaroid transmitted light in the polaroid surface reflection; for example; can give the micro concavo-convex structure to the protective film surface and form by adopting sandblast mode or the mode of slightly coming to the surface of embossing processing mode and the suitable modes such as mode that cooperate transparent particulate.As the particulate that in the formation of above-mentioned surperficial micro concavo-convex structure, contains, for example, can use mean grain size is the inorganic transparent particulates of being made up of monox, aluminium oxide, titanium dioxide, zirconia, tin oxide, indium oxide, cadmium oxide, antimony oxide etc. such as organic fine particles that are particulate, are made up of crosslinked or uncrosslinked polymkeric substance etc. with electric conductivity of 0.5～50 μ m.When forming surperficial micro concavo-convex structure, the use amount of particulate forms the transparent resin of surperficial micro concavo-convex structure with respect to 100 weight portions, is generally about 2～50 weight portions preferred 5～25 weight portions.Antiglare layer also can be held concurrently to work as and be used for the polaroid transmitted light is spread and the diffusion layer (visual angle expanded functionality etc.) at expansion visual angle etc.
Also have, above-mentioned anti-reflection layer, antiblocking layers, diffusion layer and antiglare layer etc. can also be provided with as another optical layers with the transparent protective film separate configuration except being arranged on transparent protective film from one's body.
Ellipsoidal polarizing plate of the present invention is preferred in the liquid crystal indicator of IPS pattern.The liquid crystal indicator of IPS pattern comprises following liquid crystal cells, and promptly this liquid crystal cells comprises: a pair of substrate of clamping liquid crystal layer, in the electrode group of a square one-tenth of above-mentioned a pair of substrate, be clamped in liquid-crystal composition matter layer between aforesaid substrate, form and be used for the driving mechanism that molecule assortment with above-mentioned liquid-crystal composition matter is arranged in the orientation key-course of prescribed direction and is used for applying to above-mentioned electrode group driving voltage in the subtend of above-mentioned a pair of substrate with dielectric anisotropy.Above-mentioned electrode group has the interface that is configured to above-mentioned orientation key-course and above-mentioned liquid-crystal composition matter layer, mainly applies the assortment structure of parallel electric field and so on.
Ellipsoidal polarizing plate of the present invention is configured in the identification side of liquid crystal cells, at least one side of light incident side.Fig. 3 is the situation that the ellipsoidal polarizing plate of Fig. 1 is disposed at the identification side.As shown in Figure 3, ellipsoidal polarizing plate preferably with optical thin film 2 as liquid crystal cells LC side.In Fig. 3, at opposition side (light incident side) the configuration polaroid 1 ' of the liquid crystal cells 4 that has disposed ellipsoidal polarizing plate.Be configured in the absorption axes of polaroid 1 ' of both sides of substrate of liquid crystal cells LC and the absorption axes of ellipsoidal polarizing plate (polaroid 1) and be configured to quadrature.As polaroid 1 ', use polaroid usually at the both sides of polariscope 1a stacked guard film 1b.
The liquid crystal indicator of above-mentioned Fig. 3 is an example of liquid crystal cells, and ellipsoidal polarizing plate of the present invention goes for other various liquid crystal indicators.
Embodiment
Below enumerate embodiment, a mode of the present invention is described, do not limit but the present invention is not implemented example.
In addition, the refractive index of each optical thin film, phase differential are to utilize automatic double refraction detection device (prince's measuring instrument Co., Ltd. system, what automatic birefringence meter KOBRA21ADH), the characteristic of principal refractive index nx, ny, nz was implemented in the mensuration pellicular front and under the λ=590nm of thickness direction.
Reference example
(polariscope)
In warm water, flood polyvinyl alcohol film, make its swelling, in iodine/potassium iodide aqueous solution, dye then, then in boric acid aqueous solution, carry out unilateral stretching and handle, obtain polariscope.Utilize spectrophotometer for this polariscope, detect monomer transmitance, parallel transmitance and quadrature transmitance, transmitance is 43.5% as a result, degree of polarization is 99.9%.
(phase-contrast film A)
Under 170 ℃, be non-stretched film (the ァ one ト Application film of JSR corporate system) unilateral stretching to 1.3 times with the norborene of thickness 100 μ m.The oriented film thickness that obtains: 80 μ m, front phase differential: 100nm.The oriented film that obtains has the positive refractive index anisotropy (nx＞ny nz) of unilateral stretching.
(phase-contrast film B)
[changing 6]
Modulation is with above-mentionedization 6 (the mole % of the numeral monomeric unit in the formula, represent for convenience with segmented copolymer) light trigger (Irgacure 907:Chiba Specialty chemicals corporate system) of side chain liquid crystalline polymer 5 weight portions of expression, polymerizable liquid crystal (Paliocolor LC242, BASF system) 20 weight portions that show the nematic crystal phase and above-mentioned relatively polymerizable liquid crystal 3 weight portions is dissolved in the solution of cyclohexanol 75 weight portions.Then, utilize rod to be coated with device, on the ゼ ォ ノ ァ film of Japanese ゼ ォ Application company, be coated with this solution, under 100 ℃, after the dry orientation 10 minutes, irradiation ultraviolet radiation solidifies it, thereby obtains the vertical orientated liquid crystal film layer of thickness 1.0 μ m.Measure the result of the optical phase difference (the vertical or oblique incidence mensuration light from relative sample surfaces) of this sample, the front phase differential is roughly 0, and in addition by the increase along with the incident angle of measuring light, phase differential increases, and confirms to have obtained vertical orientated.The thickness direction phase differential of vertical orientated liquid crystal film layer is a 100nm.
(ellipsoidal polarizing plate)
The polariscopic one side that obtains in reference example, by the polyethenol series tackifier, the phase differential of bonding thickness 80 μ m, front phase differential: 6nm, thickness direction: the triacetyl cellulose of 60nm (TAC) film forms protective clear layer.At this polariscopic another side, bonding by the polyethenol series tackifier in the mode of the slow axis quadrature of polariscopic absorption axes and phase-contrast film A, thereon, and by acrylic adhesive, applying phase-contrast film B.Then, peel off ゼ ォ ノ ァ film, obtain ellipsoidal polarizing plate.
(phase-contrast film A)
Under 170 ℃, be non-stretched film (the ァ one ト Application film of JSR corporate system) unilateral stretching to 1.4 times with the norborene of thickness 100 μ m.The oriented film thickness that obtains: 70 μ m, front phase differential: 180nm.The oriented film that obtains has the positive refractive index anisotropy (nx＞ny nz) of unilateral stretching.
(phase-contrast film B)
In embodiment 1, except the thickness that makes vertical orientated liquid crystal film layer is 0.5 μ m, obtain vertical orientated liquid crystal film layer with embodiment 1 the samely.The thickness direction phase differential of vertical orientated liquid crystal film layer is-50nm.
(ellipsoidal polarizing plate)
In embodiment 1, except use as phase-contrast film A, phase-contrast film B above-mentioned obtain, obtain ellipsoidal polarizing plate with embodiment 1 the samely.
Embodiment 3
(phase-contrast film A)
Under 175 ℃, be non-stretched film (the ァ one ト Application film of JSR corporate system) unilateral stretching to 1.35 times with the norborene of thickness 100 μ m.The oriented film thickness that obtains: 75 μ m, front phase differential: 140nm.The oriented film that obtains has the positive refractive index anisotropy (nx＞ny nz) of unilateral stretching.
(phase-contrast film B)
In embodiment 1, except the thickness that makes vertical orientated liquid crystal film layer is 1.3 μ m, obtain vertical orientated liquid crystal film layer with embodiment 1 the samely.The thickness direction phase differential of vertical orientated liquid crystal film layer is-130nm.
(ellipsoidal polarizing plate)
In embodiment 1, except use as phase-contrast film A, phase-contrast film B above-mentioned obtain, obtain ellipsoidal polarizing plate with embodiment 1 the samely.
Comparative example 1
The polariscopic one side that obtains in reference example, by the polyethenol series tackifier, the phase differential of bonding thickness 80 μ m, front phase differential: 6nm, thickness direction: the triacetyl cellulose of 60nm (TAC) film forms protective clear layer.At this polariscopic another side, by the polyethenol series tackifier, the phase differential of bonding thickness 80 μ m, front phase differential: 6nm, thickness direction: the triacetyl cellulose of 60nm (TAC) film obtains polaroid.
Comparative example 2
The polariscopic one side that obtains in reference example, by the polyethenol series tackifier, the phase differential of bonding thickness 40 μ m, front phase differential: 3nm, thickness direction: the triacetyl cellulose of 40nm (TAC) film forms protective clear layer.At this polariscopic another side, by the polyethenol series tackifier, bonding thickness: the phase differential of 40 μ m, front phase differential: 3nm, thickness direction: the triacetyl cellulose of 40nm (TAC) film obtains polaroid.
Comparative example 3
(phase-contrast film A ')
Under 175 ℃, with the polycarbonate film unilateral stretching to 1.3 of thickness 80 μ m times.The oriented film thickness that obtains: 50 μ m, front phase differential: 300nm.The oriented film that obtains has the positive refractive index anisotropy (nx＞ny nz) of unilateral stretching.
(phase-contrast film B)
In embodiment 1, except the thickness that makes vertical orientated liquid crystal film layer is 3.0 μ m, obtain vertical orientated liquid crystal film layer with embodiment 1 the samely.The thickness direction phase differential of vertical orientated liquid crystal film layer is-300nm.
(ellipsoidal polarizing plate)
In embodiment 1, except replacing phase-contrast film A, as phase-contrast film A ', phase-contrast film B use above-mentioned obtain beyond, obtain ellipsoidal polarizing plate with embodiment 1 the samely.
(evaluation)
To carrying out following evaluation at above-mentioned ellipsoidal polarizing plate that obtains or polaroid.The result is illustrated in table 1.
(visual angle)
The ellipsoidal polarizing plate that obtains among the embodiment 1～3 is disposed at the identification side of the liquid crystal cells of IPS pattern as shown in Figure 3.As shown in Figure 4, the polaroid that obtains in comparative example 1,2 is configured in the identification side of the liquid crystal cells of IPS pattern.Replace the ellipsoidal polarizing plate of use among the embodiment 1, used the ellipsoidal polarizing plate that obtains in the comparative example 3.On the other hand, disposed the polaroid that in comparative example 1, obtains at light incident side (backlight side).
Make above-mentioned liquid crystal indicator display white image, black image, utilize the EZcontrast160D of ELDIM corporate system, about the mensuration, about, the XYZ on 45 °-225 ° at the diagonal angle, 135 ° of-315 ° of directions in diagonal angle shows Y value, x value, y value in the system.With the value of contrast (Y value (white image)/Y value (black image)) at this moment is that the above angle of 25 degree is as the visual angle.
(inequality that applying stress causes)
Utilize acrylic adhesive (20 μ m), use roller (roller), on alkali glass, be fitted in above-mentioned ellipsoidal polarizing plate that obtains or polaroid (400mm * 300mm) make it become Nicol crossed.After the irradiation backlight, the inequality that the stress after the following benchmark Visual Confirmation of machine figure is fitted causes.
Zero: can not confirm light leak.
*: can confirm light leak.
(adding heat durability)
Utilize acrylic adhesive (20 μ m), use roller (roller), on alkali glass, be crimped on above-mentioned ellipsoidal polarizing plate that obtains or polaroid (300mm * 200mm) make it become Nicol crossed, utilize 50 ℃, 5 atmospheric pressure, 15 minutes autoclaving then, remove bubble.And then after the irradiation backlight, uneven based on the periphery of input under the environment of 80 ℃ of following benchmark Visual Confirmations after 100 hours.
Zero: can not confirm light leak.
*: can confirm light leak.
Table 1
| | | Embodiment 3 | Comparative example 1 | Comparative example 2 | Comparative example 3 | |
| The visual angle | 70 | 70 | 65 | 40 | 40 | 30 |
| Unbalanced stress | ○ | ○ | ○ | ○ | ○ | × |
| Add heat durability | ○ | ○ | ○ | ○ | ○ | × |
Utilizability on the industry
Ellipsoidal polarizing plate of the present invention is applicable to the image display devices such as liquid crystal indicator, organic EL (electroluminescent) display unit, PDP. Particularly ellipsoidal polarizing plate of the present invention is preferred for the active array type LCD of Transverse electric-field type (IPS pattern).
Claims (9)
1. an ellipsoidal polarizing plate is characterized in that,
Stacked and the optical thin film that forms of phase-contrast film A as described below and phase-contrast film B as described below, stacked in a polariscopic side in the mode of the slow axis of phase-contrast film A and polariscopic absorption axes quadrature,
Described phase-contrast film A is made of the thermal plastic high polymer that contains cyclic polyolefin resin, with the refractive index in the face for maximum direction be made as X-axis, the direction vertical with X-axis be made as Y-axis, thickness direction be made as the Z axle, when each axial refractive index is made as nx, ny, nz respectively, it has the positive refractive index anisotropy (nx＞ny nz) of one-way orientation;
Described phase-contrast film B is fixed to vertical orientated, and the refractive index in the face is being made as for maximum direction is made as X-axis, the direction vertical with X-axis that Y-axis, thickness direction are made as the Z axle, each axial refractive index is made as nx respectively
1, ny
1, nz
1The time, it has positive refractive index anisotropy (nz
1＞nx
1 ny
1).
2. ellipsoidal polarizing plate according to claim 1 is characterized in that,
From polariscope, optical thin film is arranged according to the sequential cascade of phase-contrast film A, phase-contrast film B.
3. ellipsoidal polarizing plate according to claim 1 is characterized in that,
Described phase-contrast film A is the film that contains norbornene resin.
4. ellipsoidal polarizing plate according to claim 1 is characterized in that,
The phase differential of the thickness direction of phase-contrast film B: { ((nx
1+ ny
1)/2)-nz
1} * d (thickness: nm) be-500nm～-10nm.
5. ellipsoidal polarizing plate according to claim 1 is characterized in that,
Phase-contrast film B is the film that contains side chain liquid crystalline polymer.
6. ellipsoidal polarizing plate according to claim 1 is characterized in that,
Phase-contrast film A is λ/4 plates.
7. an image display device is characterized in that,
Be laminated with any described ellipsoidal polarizing plate in the claim 1～6.
8. a liquid crystal indicator is characterized in that,
Be laminated with any described ellipsoidal polarizing plate in the claim 1～6.
9. liquid crystal indicator according to claim 8 is characterized in that,
Drive pattern is transverse electric field mode (an IPS pattern).
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP156001/2004 | 2004-05-26 | ||
| JP2004156001 | 2004-05-26 | ||
| JP284618/2004 | 2004-09-29 |
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| Publication Number | Publication Date |
|---|---|
| CN1942790A true CN1942790A (en) | 2007-04-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200580011692 Pending CN1942790A (en) | 2004-05-26 | 2005-04-05 | Elliptical polarizing plate and image display |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105870148A (en) * | 2015-02-11 | 2016-08-17 | 三星电子株式会社 | Organic light emitting device and method of manufacturing the same |
| CN111164471A (en) * | 2017-10-02 | 2020-05-15 | 3M创新有限公司 | Partial reflector for correcting color shift |
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2005
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105870148A (en) * | 2015-02-11 | 2016-08-17 | 三星电子株式会社 | Organic light emitting device and method of manufacturing the same |
| CN111164471A (en) * | 2017-10-02 | 2020-05-15 | 3M创新有限公司 | Partial reflector for correcting color shift |
| CN111164471B (en) * | 2017-10-02 | 2022-05-17 | 3M创新有限公司 | Partial reflector for correcting color shift |
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