CN101114066A - Manufacturing method of adhesive optical film, adhesive optical film and image display apparatus - Google Patents

Abstract

The present invention provides a method for making an adhesive optical film which is provided with a smectic crystal layer where the smectic crystal compound is orientated and furthermore the smectic crystal layer is stacked with an adhesive layer, and the adhesive optical film can restrain the window frame inhomogeneity generated at the state of the illumination of backlight lamp. The method for making the adhesive optical film comprises the following working procedures, namely: orienting the smetric crystal layer comprising the polymerized unsaturated groups at one surface of the transparent base material film, arranging adhesive layer at the smectic crystal layer of the optical film and the smectic crystal layer is formed by solidifying, and the method is characterized in that the ultraviolet light and/or visible light is irradiated to the smectic crystal layer when the working procedure of setting adhesive layer is implemented.

Description

The manufacture method of adhesive optical film, adhesive optical film and image display device

Technical field

The present invention relates to a kind of manufacture method of adhesive optical film.In addition, the invention still further relates to and utilize the adhesive optical film that this manufacture method obtains and then the liquid crystal indicator that uses this adhesive optical film, organic EL display, image display devices such as CRT, PDP.

Adhesive optical film of the present invention has the disc-like liquid crystal layer that dish shape (discotic) liquid-crystal compounds is oriented, can be with acting on the optical compensating film that improves the viewing angle characteristic that shows contrast and Show Color, particularly being laminated with polariscopic adhesive optical film of the present invention can be as the ellipsoidal polarizing plate of band optical compensation function.

Background technology

Clock, mobile phone, PDA, notebook computer, PC are expanded in market apace with the liquid crystal indicator of monitor, DVD player, TV etc.Liquid crystal indicator is that the switch (switching) that utilizes liquid crystal makes polarized light state change visible apparatus, needs to use polariscope from its displaying principle.Particularly in purposes such as TV, more and more need the demonstration of high brightness and high-contrast, for polariscope, also develop and imported brighter (high permeability), the polariscope of high-contrast (high-polarization) more.

Now, the main flow mode of general liquid crystal indicator is to use the TFT-LCD of TN liquid crystal.This mode has the advantage that responsing reaction is fast, can obtain high contrast etc.But when the angle that favours its normal direction was observed the demonstration of the panel used the TN liquid crystal, contrast significantly reduced, and gray scale also takes place in addition show the gray scale reverse that reverses etc., so there is the very narrow characteristic of field angle in the TN liquid crystal.On the other hand, in large-scale purposes such as PC monitor or television machine, the Show Color that requires high-contrast, wide visual field angle, field angle to cause is with low uncertainty etc.Thereby, being used at TFT-LCD under the situation of such purposes the TN pattern, the phase-contrast film that is used to compensate field angle is indispensable.

As this phase-contrast film, use stretching birefringent polymer film all the time.Recently, replacement has proposed to use the optical compensating film that has the optical anisotropic layer that is formed by the liquid crystal liquid crystal property molecule on transparent supporting body by the optical compensating film that the stretching birefringent film constitutes.Because it is multiple aligned that the liquid crystal liquid crystal property molecule has, so by using the liquid crystal liquid crystal property molecule to realize that the optical property that stretching birefringent polymer film in the past can not obtain becomes possibility.

Phase-contrast film as aforesaid field angle compensation usefulness for example proposes to have the wide visual field film (with reference to patent documentation 1, patent documentation 2) that uses the Fuji Photo film system with negative anisotropic disc-like liquid crystal of refractive index.This phase-contrast film has the disc-like liquid crystal layer that optical axis is tilted orientation in the one side of transparent base film.This phase-contrast film is a purpose to improve the black field angle characteristic that applies under the state at voltage that shows mainly.That is, under voltage applied state, the liquid crystal molecule in the liquid crystal cells demonstrated the positive refractive index anisotropy with the optical axis that favours glass substrate.In order to compensate the phase differential that this refractive index anisotropy causes, phase-contrast film utilizes optical axis to tilt and have the anisotropic liquid crystal liquid crystal property molecule of negative refractive index from the film normal direction.

In the phase-contrast film of described field angle compensation usefulness, at transparent base film laminated polarizing mirror and as ellipsoidal polarizing plate, and on the other hand, at the folded layer by layer adhesive phase of disc-like liquid crystal.Be laminated with adhesive optical films such as the phase-contrast film of this adhesive phase or ellipsoidal polarizing plate and be fitted in uses such as liquid crystal cells via this adhesive phase.But, if make up the liquid crystal indicator etc. that the phase-contrast film of described field angle compensation usefulness or ellipsoidal polarizing plate is fitted in liquid crystal cells etc. via adhesive phase with backlight (illumination condition), then exist in produce near the frame of liquid crystal indicator uneven (below be referred to as the window frame inequality.), the problem of visuognosis reduction.Particularly temperature uprises or the size of liquid crystal indicator when becoming big, and the window frame inequality becomes more remarkable.

Patent documentation 1: the spy opens flat 8-95032 communique

Patent documentation 2: No. 2767382 instructions of patent

Summary of the invention

The object of the present invention is to provide a kind of one side in transparent base film to have disc-like liquid crystal layer that the disc-like liquid crystal compound is oriented and then the manufacture method that is laminated with the adhesive optical film of adhesive phase on this disc-like liquid crystal layer, this adhesive optical film can be suppressed at the window frame inequality that the illumination condition of backlight takes place down.

In addition, the present invention also aims to provide a kind of adhesive optical film that utilizes described manufacture method to obtain, and then a kind of image display device that uses this adhesive optical film also is provided.

The inventor etc. concentrate on studies in order to solve described problem, found that the manufacture method of utilizing following adhesive optical film can realize described purpose, so that finish the present invention.

Promptly, the present invention relates to a kind of manufacture method of adhesive optical film, it has operation as described below, that is: this disc-like liquid crystal layer that has an optical thin film by disc-like liquid crystal layer that the disc-like liquid crystal compound with polymerism unsaturated group is orientated, is solidified to form in the one side of transparent base film is provided with adhesive phase, it is characterized in that

Before implementing that the operation of adhesive phase is set, to disc-like liquid crystal layer irradiating ultraviolet light and/or visible light.

In the manufacture method of described adhesive optical film, after irradiating ultraviolet light and/or visible light, implement to be provided with before the operation of adhesive phase, have: the operation that undercoat is set.

In the manufacture method of described adhesive optical film, preferred irradiates light comprises ultraviolet light, and the integration light quantity of wavelength 350nm is 10～10000mJ/cm ²

In the manufacture method of described adhesive optical film, the one side that is preferably formed the transparent base film of disc-like liquid crystal layer implements milled processed (rubbing) or is formed with alignment films.

In the manufacture method of described adhesive optical film,, can use one side to be laminated with polariscopic optical thin film in the transparent base film of a side that does not form the disc-like liquid crystal layer as optical thin film.

In the manufacture method of described adhesive optical film, after implementing that the operation of adhesive phase is set, have: in the operation of a laminated polarizing mirror of the transparent base film of a side that does not form the disc-like liquid crystal layer.

In addition, the invention still further relates to a kind of adhesive optical film that utilizes described manufacture method to obtain.

In addition, the invention still further relates to a kind of image display device that uses a described adhesive optical film at least.Adhesive optical film of the present invention can corresponding liquid crystal indicator etc. image display device various use-patterns and use one or be used in combination many.

The inventor etc. think, though having given play to the disc-like liquid crystal layer of the function of optical compensating layer and be to utilize makes the disc-like liquid crystal compound with polymerism unsaturated group be orientated, solidify and form, but also remaining polymerism unsaturated group in this disc-like liquid crystal layer, under the influence of this remaining polymerism unsaturated group, make backlight in illumination condition following time for a long time, compare with core, the phase difference value change is big in the front of window frame part, and this becomes the reason that causes the window frame inequality.

Therefore, the manufacture method of adhesive optical film of the present invention, before adhesive phase being set,, polymerism unsaturated group remaining in the disc-like liquid crystal layer is reduced to disc-like liquid crystal layer irradiating ultraviolet light and/or visible light at disc-like liquid crystal layer to the one side that is arranged at transparent base film.Like this, by suppressing the influence that remaining polymerism unsaturated group causes in the disc-like liquid crystal layer, can partly suppress the front phase difference value at window frame and become the window frame inequality that causes greatly.In addition, by to disc-like liquid crystal layer irradiating ultraviolet light and/or visible light, the hardness on the surface of disc-like liquid crystal layer uprises, and the raising of this skin hardness also has the effect that suppresses the window frame inequality.

Window frame is uneven to be taken place under the bigger situation of liquid crystal indicator easily, so the manufacture method of adhesive optical film of the present invention is effective especially under the situation of the big adhesive optical film of manufacturing dimension.In addition, window frame is uneven to be taken place under the high situation of environment temperature easily, so the manufacture method of adhesive optical film of the present invention is effective especially under the situation that is manufactured on the adhesive optical film that uses under the hot environment.

Description of drawings

Fig. 1 is the example of flow process of the manufacture method of expression adhesive optical film of the present invention.

Fig. 2 is the example of flow process of the manufacture method of expression adhesive optical film of the present invention.

Fig. 3 is the example of flow process of the manufacture method of expression adhesive optical film of the present invention.

Among the figure, 1-transparent base film, 2-alignment films, 3-disc-like liquid crystal layer, 4-undercoat, 5-adhesive phase, 6-polariscope, 7-transparent protective film.

Embodiment

It is following that the present invention will be described with reference to accompanying drawing.As shown in Figure 1, optical thin film of the present invention has disc-like liquid crystal layer 3 in the one side of transparent base film 1.Disc-like liquid crystal layer 3 is the layers by the disc-like liquid crystal compound with polymerism unsaturated group is orientated, is solidified to form.In Fig. 1, illustration the situation of alignment films 2 is set between transparent base film 1 and disc-like liquid crystal layer 3, also can replace alignment films 2, the one side of transparent base film 1 is carried out using after the milled processed.

In Fig. 1 (1), to the surface irradiation ultraviolet light and/or the visible light of disc-like liquid crystal layer 3.Like this, when the remaining polymerism unsaturated group of disc-like liquid crystal layer 3 is reduced, improve hardness.In addition, in Fig. 1 (1),, but also can shine from the transparent base film side from the side irradiation irradiates light of disc-like liquid crystal layer 3.

Then, shown in Fig. 1 (2), after undercoat 4 is set, shown in Fig. 1 (3), adhesive phase 5 is set, makes adhesive optical film of the present invention.In addition, the operation that the undercoat 4 shown in Fig. 1 (2) is set is arbitrarily, also undercoat 4 can be set, and shown in Fig. 1 (3 '), adhesive phase 5 be set on disc-like liquid crystal layer 3.

Fig. 2 is to use the one side in transparent base film 1 to have disc-like liquid crystal layer 3 via alignment films 2, at laminated polarizing mirror 6 of the transparent base film 1 of a side that does not form disc-like liquid crystal layer 3 and transparent protective film 7 and the situation of the optical thin film that obtains.In Fig. 2, transparent base film 1 is gone back the transparent protective film of double as polariscope 6.As shown in Figure 2, also can implement the operation identical, when can reduce the remaining polymerism unsaturated group of disc-like liquid crystal layer 3, can also improve hardness optical thin film with polaroid with Fig. 1.

Fig. 3 is illustrated in the adhesive optical film that obtains among Fig. 1 (3), at laminated polarizing mirror 6 that does not form a side of disc-like liquid crystal layer 3, transparent base film 1 and transparent protective film 7, makes the situation of the optical thin film with polaroid.In Fig. 3, transparent base film 1 is the transparent protective film of double as polariscope 6 also.

In the present invention, use the optical thin film that has disc-like liquid crystal layer 3 in the one side of transparent base film 1.

As transparent base film, can use various transparent materials.For example can enumerate 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, tygon, polypropylene, polyolefin with ring system or norborene structure, the polyolefin polymkeric substance of similar ethylene-propylene copolymer, 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, the polyetheretherketone based polymer, the polyphenylene sulfide based polymer, vinyl alcohol system polymer, the vinylidene chloride based polymer, the polyvinyl butyral based polymer, the polyarylate based polymer, the polyoxymethylene based polymer, the epoxy based polymer, perhaps above-mentioned mixture of polymers etc., the example that also can be used as the polymkeric substance that forms above-mentioned transparent base film is enumerated.

In addition, also can enumerate as the spy and open the thin polymer film described in the 2001-343529 communique (WO01/37007), as for contain have on (A) side chain replace and/or not the substituted imides base thermoplastic resin and (B) have the resin combination of the thermoplastic resin of replacement and/or unsubstituted phenyl and itrile group on the side chain.As concrete example, can be exemplified as and contain by the contract film of resin combination of alternating copolymer that imines constitutes and acrylonitrile styrene copolymer of isobutylene and N-methyl maleic anhydride.Film can use the film that is made of extrusion goods of resin combination etc.

Can suit to determine the thickness of transparent base film, but, be about 1～500 μ m usually from aspects such as operations such as intensity or operability, thin layers.Preferred especially 5～200 μ m.

In addition, transparent base film does not preferably have painted as far as possible.Therefore; the preferred use (wherein with Rth=(nx-nz) d; nx is the refractive index of the slow axis direction in the thin film planar, and nz is the refractive index of film thickness direction, and d is a film thickness) phase differential on the film thickness direction of expression for-90nm～+ protective film of 75nm.By use phase difference value (Rth) on this thickness direction be-90～+ film of 75nm, roughly can eliminate the polaroid that causes by transparent base film painted (optical clouration).Phase differential on the thickness direction (Rth) is further preferred-80～+ 60nm, preferred especially-70～+ 45nm.

As transparent base film, from aspects such as polarization characteristic or permanance, cellulose-based polymkeric substance or norbornene-based polymer such as preferred triacetyl cellulose.Cellulose-based polymkeric substance such as preferred especially triacetyl cellulose.

The disc-like liquid crystal layer is the layer by the disc-like liquid crystal compound with polymerism unsaturated group is orientated, solidify to form.The disc-like liquid crystal layer can be used as optical compensating layer, can improve field angle, contrast, lightness etc.The disc-like liquid crystal compound has the polymerism unsaturated group, orientation takes place and solidify to form the disc-like liquid crystal layer by making this compound.The disc-like liquid crystal layer is preferably the liquid crystal layer of disc-like liquid crystal compound run-off the straight orientation.The thickness of disc-like liquid crystal layer is generally about 0.5～10 μ m.

The disc-like liquid crystal compound is meant the liquid-crystal compounds with negative refractive index anisotropy (one-way); for example can enumerate the research report of C.Destrade etc.; the Mol.Cryst.71 volume; the benzene derivative of record in 111 pages (1981); or the research report of B.Kohne etc.; the Angew.Chem.96 volume; people's such as the cyclohexane derivant of record and J.M.Lehn research report in 70 pages (1984); J.Chem.Commun.; 1794 pages (1985); people's such as J.Zhang research report; the J.Am.Chem.Soc.116 volume; the nitrogen crown compound of putting down in writing in 2655 pages (1994) (ア ザ Network ラ ウ Application) is or phenylacetylene is a big ring-type (macrocycle) etc.; be generally they parent nucleus as minute subcenter; the alkyl of straight chain or alkoxy; substituted benzoyl carboxyls etc. are as its straight chain; be replaced to radial structure, comprise the demonstration liquid crystal liquid crystal property; be commonly called the organic compound of disc-like liquid crystal.But, so long as molecule self has negative one-way and can give getting final product of certain orientation, do not limited by above-mentioned record.In addition, in the present invention, the disc-like liquid crystal compound has the polymerism unsaturated group (for example can enumerate acryloyl group, methacryl, vinyl, allyl etc.) that curing reaction takes place under effects such as heat, light.In addition, it is described compound that the disc-like liquid crystal layer does not need final product, comprises that also polymerization or crosslinked takes place the reaction by the polymerism unsaturated group, thereby is quantized to lose the compound of liquid crystal liquid crystal property by macromolecule.

In addition, the disc-like liquid crystal compound is meant the reaction between utilization and various disc-like liquid crystal compound and other low molecular compounds or the polymkeric substance, the reaction product etc. and so on that has no longer shown the disc-like liquid crystal of liquid crystal liquid crystal property, molecule self have and are negative unidirectional all compounds on the optics.

The orientation process of disc-like liquid crystal comprises milled processed transparency carrier film surface or uses alignment films.As alignment films, can enumerate inorganics oblique evaporation film or grind the alignment films that specific organic high molecular layer obtains.Also comprise LB film that constitutes as azobenzene derivatives and so on, under light action, isomerization takes place, thereby make molecule have directivity and the film arranged equably etc.As organic alignment films, can enumerate polyimide film or alkyl chain modification is the organic high molecular layer that polyvinyl alcohol (PVA), polyvinyl butyral, polymethylmethacrylate etc. form hydrophobic surface.In addition, as inorganics oblique evaporation film, can enumerate SiO oblique evaporation film.

Disc-like liquid crystal compound run-off the straight orientation, as its means, for example can use and on transparent base film, form alignment films, then apply disc-like liquid crystal compound (polymerizable liquid crystal compound), make it be in the tilted alignment state, then the method for immobilization etc. under rayed such as ultraviolet light or heat effect.In addition, also can utilize on the optics to form by on other oriented substrate, making after the disc-like liquid crystal run-off the straight orientation for transparent bonding agent or pressure-sensitive adhesive transfer printing on transparent supporting body.

As this disc-like liquid crystal layer, preferably use the disc-like liquid crystal layer of record in the patent documentation 1,2.As such disc-like liquid crystal layer that on cellulose-based macromolecule membrane, forms the tilted alignment layer of disc-like liquid crystal, the wide visual field film (wide view film) of Fuji Photo Film Co Ltd.'s system is arranged.

In the present invention, to described disc-like liquid crystal layer irradiating ultraviolet light and/or visible light.By irradiating ultraviolet light and/or visible light, can reduce remaining polymerism unsaturated group.In addition, the skin hardness of disc-like liquid crystal layer uprises.By described irradiation, preferably the hardness of disc-like liquid crystal layer is exposed to and become about 0.02～0.12GPa.In addition, the material that uses in the formation of the hardness of disc-like liquid crystal layer according to the disc-like liquid crystal layer and difference, the hardness of the disc-like liquid crystal layer of described pre-irradiation is preferably about 0.11～0.1 6GPa usually, and the hardness of described postradiation disc-like liquid crystal layer is preferably about 0.1 7～0.24GPa usually.

For remaining polymerism unsaturated group, can be by the 1510cm of IR spectrum ^-1(aromatic series source) and 811cm ^-1The absorbance in (carbon-to-carbon double bond source) is than (811cm ^-1/ 1510cm ^-1) reduce to confirm.By described irradiation, preferred irradiation makes the absorbance of disc-like liquid crystal layer than reducing about 0.04～0.18.In addition, the absorbance ratio of the disc-like liquid crystal layer of described pre-irradiation is generally about 0.23～0.30, and the absorbance of described postradiation disc-like liquid crystal layer is than being preferably about 0.12～0.19 usually.

Described irradiates light can use ultraviolet light and/or visible light.The integration light quantity of irradiates light is preferably 10～10000mJ/cm usually ²By the integration light quantity of this scope, can carry out the surface treatment of described disc-like liquid crystal layer effectively.

As irradiates light, comprise ultraviolet light, in the integration light quantity of wavelength 350nm preferably in described scope.Thereby, preferably include the situation of ultraviolet light from shortening the point that irradiation time can implementation efficiencyization.

Disc-like liquid crystal layer at illuminated described ultraviolet light and/or visible light is provided with adhesive phase, and before the operation that adhesive phase is set is implemented, undercoat can be set.

As the formation material of undercoat, for example can enumerate that carbamate (polyisocyanate) is, material such as polyester system, acrylic acid series, polyamide-based, melamine system, ethylene series, polystyrene, epoxy system, phenol system, isocyanate-based, isocyanuric acid ester system, polyvinyl acetate (PVA) system, silane coupling agent.Undercoat can improve the adhesiveness with adhesive phase.Also can in described formation material, add functional additives such as the crosslinking chemical that is used to make its crosslinking curing or antistatic agent, give other functions.

As the laminating method of undercoat, the kind of formation material that can corresponding undercoat is suitably selected various laminating methods.For example, can adopt the extruded layer platen press or utilize the method, coating of the dried laminating etc. of system film after make the method etc. of its dry solidification.The thickness of undercoat is generally below the 1 μ m, is preferably 10～500nm.

The bonding agent that forms adhesive phase is not particularly limited, and can use rubber is various bonding agents such as bonding agent, acrylic adhesive, silicone-based adhesive, use usually water white transparency and with the good acrylic adhesive of cementability of liquid crystal cells etc.

It is that the acrylic acid series polymeric compounds of main framing is as base polymer that acrylic adhesive will contain monomeric unit with (methyl) alkyl acrylate.Wherein, (methyl) acrylate is meant acrylate and/or methacrylate, with the identical meaning of (methyl) of the present invention expression.The average carbon atom number of the alkyl of (methyl) alkyl acrylate of the main framing of formation acrylic acid series polymeric compounds is about 1～12, object lesson as (methyl) alkyl acrylate, can be illustrated as (methyl) methyl acrylate, (methyl) ethyl acrylate, (methyl) n-butyl acrylate, (methyl) acrylic acid-2-ethyl caproite, (methyl) Isooctyl acrylate monomer, (methyl) acrylic acid ester in the different ninth of the ten Heavenly Stems, (methyl) acrylic acid Lauryl Ester etc., these can be used alone or in combination.Wherein, the carbon number of preferred alkyl is (methyl) alkyl acrylate of 1～9.

In described acrylic acid series polymeric compounds, be purpose to improve cementability and thermotolerance, import various monomers more than a kind by copolymerization.As the concrete example of such comonomer, for example can enumerate (methyl) acrylic acid-2-hydroxyl ethyl ester, (methyl) acrylic acid-2-hydroxypropyl acrylate, (methyl) acrylic acid-4-hydroxy butyl ester, (methyl) acrylic acid-own ester of 6-hydroxyl, (methyl) acrylic acid-8-hydroxyl monooctyl ester, (methyl) acrylic acid-10-hydroxyl ester in the last of the ten Heavenly stems, (methyl) acrylic acid-12-hydroxyl lauryl or (4-methylol cyclohexyl)-hydroxyl monomers such as methyl acrylate; (methyl) acrylic acid, (methyl) acrylic acid carboxylic ethyl ester, (methyl) acrylic acid carboxylic pentyl ester, itaconic acid, maleic acid, fumaric acid, crotonic acid etc. contain carboxylic monomer; Maleic anhydride, itaconic anhydride etc. contain the anhydride group monomer; Acrylic acid caprolactone addition product; Styrene sulfonic acid or allyl sulphonic acid, 2-(methyl) acrylamide-2-methyl propane sulfonic acid, (methyl) acrylamide propane sulfonic acid, sulfo group propyl group (methyl) acrylate, (methyl) acryloyl group chomene sulfonic acid etc. contain the sulfonic group monomer; Phosphorous acidic group monomers such as 2-hydroxyethyl acryloyl phosphate etc.

In addition, can also enumerate nitrogenous vinyl monomer.Maleic anhydride imines, N-cyclohexyl maleic anhydride imines, the N-phenyl maleic anhydride imines that contracts that contracts that contracts for example; The N-acryloyl morpholine; (methyl) acrylamide, N, N-dimethyl (methyl) acrylamide, N, N-diethyl (methyl) acrylamide, N-hexyl (methyl) acrylamide, N-methyl (methyl) acrylamide, N-butyl (methyl) acrylamide, N-butyl (methyl) acrylamide or (N-replacement) acid amides such as N-methylol (methyl) acrylamide, N-hydroxymethyl-propane (methyl) acrylamide are monomer; (methyl) acrylic-amino ethyl ester, (methyl) acrylic-amino propyl ester, (methyl) acrylic acid N, (methyl) acrylic acid alkyl aminoalkyl esters such as N-dimethylamino ethyl ester, (methyl) acrylic acid tert-butyl group amino ethyl ester, (methyl) acrylic acid 3-(3-pyrimidine (ピ リ ニ ジ Le)) propyl ester are monomer; (methyl) alkoxyalkyl acrylates such as (methyl) acrylic acid methoxyl ethyl ester, (methyl) acrylic acid ethoxy ethyl ester are monomer; Succinimides such as N-(methyl) acryloyl-oxy methylene succinimide or N-(methyl) acryloyl group-6-oxygen base hexa-methylene succinimide, N-(methyl) acryloyl group-8-oxygen base eight methylene succinimides, N-acryloyl morpholine are that the monomer that monomer etc. also can be used as the modification purpose exemplifies out.

And then, can also use ethene base system monomers such as vinyl acetate, propionate, N-vinyl pyrrolidone, methyl ethylene pyrrolidone, vinylpyridine, vinyl piperidones, vinyl pyrimidine, vinyl piperazine, vinylpyrazine, vinyl pyrrole, vinyl imidazole, second alkene base oxazole, vinyl morpholine, N-vinyl carboxylic acid amide-type, styrene, α-Jia Jibenyixi, N-caprolactam; Cyanoacrylate such as vinyl cyanide, methacrylonitrile is a monomer; Diglycidyl (methyl) acrylate etc. contains the epoxy radicals acrylic monomer; Glycol such as polyglycol (methyl) acrylate, polypropylene glycol (methyl) acrylate, methoxyl ethylene glycol (methyl) acrylate, methoxyl polypropylene glycol (methyl) acrylate are acrylate monomer; Acrylic ester monomers such as (methyl) tetrahydrofurfuryl acrylate, fluorine (methyl) acrylate, silicone (methyl) acrylate or acrylic acid 2-methoxyl ethyl ester etc.

Wherein, to the cementability of liquid crystal cells, the viewpoint of adhesion durability, preferably use acrylic acid etc. to contain carboxylic monomer.

Ratio to the described comonomer in the acrylic acid series polymeric compounds is not particularly limited, but weight rate is preferably about 0.1～10%.

Mean molecular weight to acrylic acid series polymeric compounds is not particularly limited, but weight-average molecular weight is preferably about 300,000～2,500,000.The manufacturing of described acrylic acid series polymeric compounds can suitably be selected for example radical polymerizations such as mass polymerization, solution polymerization process, suspension polymerization with various known method manufacturings.As radical polymerization initiator, can use various known materials such as azo system, peroxidating system, temperature of reaction is generally about about 50～80 ℃, and the reaction time is 1～8 hour.In addition, in described manufacture method, the preferred solution polymerization as the solvent of acrylic acid series polymeric compounds, is used ethyl acetate, toluene etc. usually.Solution concentration is generally about about 20～80 weight %.

As rubber is basis (base) polymkeric substance of bonding agent, can be exemplified as natural rubber, isoprene rubber, styrene-butadiene and be rubber, reclaimed rubber, polyisobutylene and be rubber and then styrene-isobutylene-vinyl benzene rubber, s-B-S is a rubber etc.As the base polymer of silicone-based adhesive, can be exemplified as dimethyl polysiloxane, diphenyl polysiloxane etc., these base polymers also can use the material that imports functional groups such as carboxyl.

In addition, described bonding agent is preferably the adhesive composition that contains crosslinking chemical.As the polyfunctional compound that can in bonding agent, cooperate, can enumerate organic system crosslinking chemical or multi-functional metallo-chelate.As the organic system crosslinking chemical, can enumerate epoxy is crosslinking chemical, isocyanate-based crosslinking chemical, imide series crosslinking chemical etc.As the organic system crosslinking chemical, preferred isocyanate is a crosslinking chemical.The multi-functional metallo-chelate compound that to be polyvalent metal combine by covalent bond or coordination bond with organic compound.As polyvalent metal atom, can enumerate Al, Cr, Zr, Co, Cu, Fe, Ni, V, Zn, In, Ca, Mg, Mn, Y, Ce, Sr, Ba, Mo, La, Sn, Ti etc.As the atom in the organic compound that forms covalent bond or coordination bond, can enumerate oxygen atom etc., as organic compound, can enumerate Arrcostab, alcoholic compound, carboxylic acid compound, ether compound, ketonic compound etc.

There is no particular limitation to the ratio that cooperates of base polymers such as acrylic acid series polymeric compounds and crosslinking chemical, common relative 100 weight portion base polymers (solid constituent), be preferably 0.01～6 weight portion left and right sides crosslinking chemical (solid constituent), more preferably about 0.1～3 weight portion.

And then, in described bonding agent, as required and in not departing from purpose scope of the present invention, can also suitably use various adjuvants such as filling agent that tackifier, plastifier, glass fibre, beaded glass, metal powder and other powder etc. constitute, pigment, colorant, antioxidant, ultraviolet light absorber, silane coupling agent.In addition, can also be as the adhesive phase etc. that contains the scattering of particulate display light.

The formation of described adhesive phase is by stacked carrying out on described disc-like liquid crystal layer or undercoat.As the formation method, be not particularly limited, can enumerate the coating and the method for dry adhesive (solution), utilize the release sheet that adhesive phase is set to come the method etc. of transfer printing.Coating process can adopt rolling methods such as reverse coating, photogravure coating, spin-coating method, and sieve is coated with method, spraying process (fountaincoating), dip coating, gunite coating processs such as (spray).There is no particular limitation to the thickness of adhesive phase, but about preferred 10～40 μ m.

In adhesive optical film of the present invention, under the situation that adhesive phase approaches, be easy to generate window frame.Thereby adhesive optical film of the present invention is 5～40 μ m at the thickness of adhesive phase, and then under the situation of 5～25 μ m, is particularly suitable for.In addition, in adhesive optical film of the present invention, under the hard situation of adhesive phase, be easy to generate window frame.

As the constituent material of release sheet, can enumerate film of synthetic resin such as paper, tygon, polypropylene, polyethylene terephthalate; Thin slice body that sheet rubber, paper, cloth, nonwoven fabrics, net, foam sheet or metal forming, their stacked lamellar body etc. are suitable etc.In order to improve fissility, also can implement lift-off processing such as silicone-treated, chain alkyl processing, fluorine processing to the surface of release sheet 4 as required from adhesive phase.

As the constituent material of release sheet, can enumerate film of synthetic resin such as paper, tygon, polypropylene, polyethylene terephthalate; Thin slice body that sheet rubber, paper, cloth, nonwoven fabrics, net, foam sheet or metal forming, their stacked lamellar body etc. are suitable etc.In order to improve fissility, also can implement the lift-off processing of low cementabilities such as silicone-treated, chain alkyl processing, fluorine processing as required to the surface of release sheet from adhesive phase.

As shown in Figure 2, optical thin film of the present invention can use the optical thin film at laminated polarizing mirror 6 that does not form a side of disc-like liquid crystal layer 3, transparent base film 1 and transparent protective film 7.In addition, as shown in Figure 3, utilize adhesive optical film, can be manufactured on the transparent base film 1 of a side that does not form disc-like liquid crystal layer 3 a laminated polarizing mirror 6 and a transparent protective film 7, have the optical thin film of polaroid.

Use bonding agent, make polariscope 6 fit in transparent base film 1.In addition, in Fig. 2, Fig. 3, the transparent protective film of transparent base film 1 double as polariscope 6, but also can be layered in the polaroid that polariscopic one or both sides have transparent protective film in transparent base film 1.

Polariscope is not particularly limited, can uses various polariscopes.As polariscope, can enumerate, for example divide on the hydrophilic macromolecule film such as saponification film the film of dichroic substance such as absorption iodine or dichroic dye and unilateral stretching at contract polyvinyl alcohol film, the ethylene-vinyl acetate copolymer pastern of dimethoxym ethaneization of polyvinyl alcohol film, part; Polyenes such as the desalination acid treatment thing of the processed thing of polyvinyl alcohol (PVA) or Polyvinylchloride are oriented film etc.In these polariscopes, the preferred polariscope that constitutes by dichroic substance such as polyvinyl alcohol film and iodine.These polariscopic thickness are not particularly limited, are generally about 5 μ m～80 μ m.

With polyvinyl alcohol film with iodine staining after the polariscope that unilateral stretching forms for example, after can dyeing by the aqueous solution that polyvinyl alcohol (PVA) be impregnated in iodine, make for 3～7 times that are stretched to raw footage.As required, but also can impregnated in the aqueous solution of potassium iodide etc. of boronic acid containing or zinc sulfate, zinc chloride 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,, also can prevent non-uniform phenomenons such as stain by making the polyvinyl alcohol film swelling except can the lip-deep dirt of flush away polyvinyl alcohol film and prevent the adhesion agent.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.

Be arranged on the material of described polariscopic one side or two-sided transparent protective film, the preferably material that has good character in each side such as the transparency, physical strength, thermal stability, moisture barrier, isotropy as formation.Transparent protective film also can use and the transparent base film identical materials.In addition, too for thickness.

In addition, transparent base film can be used identical polymeric material with transparent protective film, also can use different polymeric materials.

Described polariscope and transparent base film and transparent protective film adhere to by the water system bonding agent usually.As the water system bonding agent, can illustration isocyanate-based bonding agent, polyethenol series bonding agent, gelatin be that bonding agent, ethene are latex, aqueous polyurethane, water system polyester etc.In addition, when applying polariscope and transparent base film and transparent protective film, can implement activation processing in transparent base film and transparent protective film.Activation processing can adopt the whole bag of tricks, for example can adopt saponification processing, corona treatment, low pressure UV processing, plasma treatment etc.Activation processing is especially effective under the situation of triacetyl cellulose, norbornene resin, polycarbonate, polyolefin-based resins etc. in transparent base film.

Not having on bonding polariscopic of described transparent protective film, can also carry out that dura mater (hard coat) layer or antireflection are handled, anti (sticking) is handled, with scattering or anti-dazzle be the processing of purpose.

Implement purpose that dura mater handles and be to prevent the surface distress of polaroid etc., mode that for example can be by the curing tunicle that the additional hardness that is made of suitable uv 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 antireflection film.In addition, implementing purpose that anti handles is the adhesion that prevents with the adjacent layer of other member.

In addition; the purpose of implementing non-glare treated is to prevent that outer light from disturbing the visuognosis of polaroid transmitted light etc. in the polaroid surface reflection; for example; can give the micro concavo-convex structure to the transparent protective film surface and form by mode of slightly coming to the surface that adopts sandblast mode or embossing processing mode or the suitable modes such as mode that cooperate transparent particulate.As the particulate that in the formation of described surperficial micro concavo-convex structure, contains, for example, can use mean grain size is the inorganic organic system particulate transparent particulates of being made up of silicon dioxide, aluminium oxide, titanium dioxide, zirconia, tin oxide, indium oxide, cadmium oxide, antimony oxide etc. such as (comprising pearl (beads)) that is particulate, is made up of crosslinked or uncrosslinked polymkeric substance etc. that often has 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 typically about 2～50 weight portions, preferred 5～25 weight portions.Antiglare layer also can be held concurrently when the scattering layer (visual angle expanded functionality etc.) that be used for the polaroid transmission light-scattering layer enlarged visual angle etc.

Also have, described anti-reflection layer, antiblocking layers, scattering layer or antiglare layer etc. can also be as other optical layers, with the transparent protective film separate configuration except being arranged on transparent protective film from one's body.

In addition, except the optical thin film of stacked described polaroid, as the optical thin film that uses in the adhesive optical film of the present invention, the optical layers of using in the formation of image display device that can stacked liquid crystal indicator etc.For example can enumerate the operable film that becomes optical layers in the formation of liquid crystal indicator etc. such as reflecting plate or anti-transmitting plate, polarizer (comprising 1/2 or 1/4 equiwavelength's sheet), brightness improving film.These can use more than 1 layer or 2 layers stacked on the described polaroid when reality is used outside can using as optical thin film separately.

Particularly preferred polaroid is reflection type polarizer or the semi-transmission type polaroid that further stacked reflecting plate or semi-penetration plate form on polaroid; Further laminated phase-difference plate forms on polaroid ellipsoidal polarizing plate or circular polarizing disk; Perhaps further stacked brightness improving film and the polaroid that forms on polaroid.

Reflection type polarizer is provided with the reflection horizon and forms on polaroid, can be used for forming the liquid crystal indicator of the type that reflection shows from the incident light of visuognosis side (demonstration side) incident etc., and can omit built-in light sources such as backlight, thereby have advantages such as being easy to make the liquid crystal indicator slimming.When forming reflection type polarizer, can be by being undertaken as required and by the suitable modes such as mode that protective clear layer etc. is set up the reflection horizon that is made of metal etc. in the one side of polaroid.

As the object lesson of reflection type polarizer, can enumerate as required on the one side of the transparent protective film of handling through delustring, set up the paper tinsel that constitutes by reflective metal such as aluminium or vapor-deposited film and form the polaroid etc. in reflection horizon.In addition, can also enumerate and make described transparent protective film contain particulate and form surperficial micro concavo-convex structure, and have the reflection type polarizer etc. in the reflection horizon of micro concavo-convex structure thereon.The reflection horizon of described micro concavo-convex structure makes the incident light scattering by diffuse reflection, prevents that thus directionality or outward appearance are shinny, has advantage that can suppress the light and shade inequality etc.In addition, the transparent protective film that contains particulate also has when incident light and reflected light thereof see through it the advantage etc. that can further suppress the light and shade inequality by scattering.The formation in reflection horizon of the micro concavo-convex structure of the surperficial micro concavo-convex structure of reflection transparent protective film, method that for example can be by directly setting up metal on the surface of protective clear layer with suitable mode such as vacuum evaporation mode, ion plating mode and sputter mode or plating mode etc. is carried out.

Instead reflecting plate directly is attached to the mode on the transparent protective film of described polaroid, the reflection horizon can also be set on the suitable film that with this transparent membrane is benchmark forms that reflector plate etc. is back to be used as reflecting plate.Also have; because the reflection horizon is made up of metal usually; so from the decline of the reflectivity that prevents to cause, and then keep the viewpoint of initial reflectance for a long time or the viewpoint avoiding establishing protective seam in addition waits, preferably cover the type of service of its reflecting surface with transparent protective film or polaroid etc. owing to oxidation.

Also have, in described, the semi-transmission type polaroid can come the catoptrical reflection horizon of the semi-transmission types such as semi-transparent semi-reflecting lens of light transmission that makes simultaneously to obtain by making with the reflection horizon.The semi-transmission type polaroid is located at the rear side of liquid crystal cells usually, can form the liquid crystal indicator of following type etc., promptly, in brighter environment, use under the situation of liquid crystal indicator etc., reflection comes from the incident light of identification side (demonstration side) and display image, in darker environment, use the built-in light sources such as backlight at the back side that is built in the semi-transmission type polaroid to come display image.Promptly, the semi-transmission type polaroid is useful in the formation of liquid crystal indicator of following type etc., that is, under bright environment, can save the energy that uses light sources such as backlight, under darker environment, also can use in the formation of liquid crystal indicator etc. of type of built-in light source very useful.

Ellipsoidal polarizing plate or the circular polarizing disk that further laminated phase-difference plate on the polaroid is constituted describes below.Rectilinearly polarized light being changed into elliptically polarized light or circularly polarized light, perhaps elliptically polarized light or circularly polarized light are changed into rectilinearly polarized light, perhaps change under the situation of polarization direction of rectilinearly polarized light, can use polarizer etc.Particularly, as rectilinearly polarized light being changed into circularly polarized light or circularly polarized light being changed into the polarizer of rectilinearly polarized light, can use so-called 1/4 wavelength sheet (be also referred to as λ/4 slice).1/2 wavelength sheet (be also referred to as λ/2 slice) is generally used for changing the situation of the polarization direction of rectilinearly polarized light.

Ellipsoidal polarizing plate can be used for following situation etc. effectively, i.e. compensation (preventing) supertwist nematic phase (STN) type liquid crystal indicator painted (blue or yellow) that produce because of the birefringence of liquid crystal layer, thus carry out the described painted white black situation about showing etc. that do not have.In addition, it is painted that the polaroid of control three-dimensional refractive index produces in the time of can also compensating (preventing) from the picture of oblique observation liquid crystal indicator, thereby preferred.Circularly polarizing plate for example can be used for effectively to situation about adjusting with the tone of the image of the reflection-type liquid-crystal display device of color display image etc., but also has the function of reflecting of preventing.

As polarizer, can enumerate to macromolecular material carry out that unidirectional or two-way stretch is handled and the oriented film of the birefringent film that forms, liquid crystal polymer, with the member of the oriented layer of film support liquid crystal polymer etc.Thickness to polarizer also is not particularly limited, and generally is about 20～150 μ m.

As macromolecular material, for example can enumerate polyvinyl alcohol (PVA), polyvinyl butyral, poly-ethylene methacrylic ether, the poly-hydroxyethyl acrylate, hydroxyethyl cellulose, hydroxypropyl cellulose, methylcellulose, polycarbonate, polyarylate, polysulfones, polyethylene terephthalate, PEN, polyethersulfone, polyphenylene sulfide, polyphenylene oxide, polyene propyl group sulfone, polyamide, polyimide, polyolefin, Polyvinylchloride, cellulose-based polymkeric substance, norbornene resin or their binary system, the various multipolymers of ternary system, graft copolymer, potpourri etc.These macromolecular materials can wait by stretching becomes orientation thing (oriented film).

As liquid-crystalline polymer, for example can enumerate the backbone chain type of the linearity atomic group (mesogene) that on the main chain of polymkeric substance or side chain, has imported the conjugacy of giving liquid crystal aligning or the various polymkeric substance of side chain type etc.Concrete example as the backbone chain type liquid crystal polymkeric substance, can enumerate and have the polymkeric substance that combines the structure of linearity atomic group on the spacer portion of bendability giving, for example the polyester to the row orientation is liquid-crystalline polymer, discoid polymkeric substance or cholesteric polymers etc.Concrete example as the side chain type liquid crystal polymkeric substance, can enumerate following compound etc., promptly, with polysiloxane, polyacrylate, polymethacrylate or poly-malonate as main chain backbone, the spacer portion that constitutes across atomic group as side chain and have compound of the straight line atom regiment headquarters that constitutes by the para-oriented ring shape compound unit of giving to the row orientation etc. by conjugacy.These liquid crystal polymers are for example handled by the following method, promptly, material after milled processed is carried out on the surface that is formed on films such as polyimide on the glass plate or polyvinyl alcohol (PVA), oblique evaporation on the orientation process face of oxide materials etc., heat-treat after sprawling the solution of liquid-crystalline polymer.

Polarizer can be that for example various wavelength sheets or be used to material of compensating painted or visual angle that the birefringence by liquid crystal layer causes etc. etc. has the material corresponding to the suitable phase differential of application target, also can be stacked more than 2 kinds polarizer and controlled the material of optical characteristics such as phase differential.

In addition, described ellipsoidal polarizing plate or reflection-type ellipsoidal polarizing plate are by suitably combination and laminated polarizing sheet or reflection type polarizer and polarizer form.These class ellipsoidal polarizing plates etc. also can form by independent successively stacked (reflection-type) polaroid and polarizer in the manufacture process of liquid crystal indicator, to constitute the combination of (reflection-type) polaroid and polarizer, and as mentioned above, under situation about being pre-formed to optical thin films such as ellipsoidal polarizing plates, because outstanding, therefore has the advantage of the manufacturing efficient that can improve liquid crystal indicator etc. at aspects such as quality of stability or lamination operation.

With polaroid and the film adhered polaroid that forms of brightness improving together, be located at the back side one side of liquid crystal cells usually and use.The brightness improving film is the film that shows below characteristic, promptly, when because of the backlight of liquid crystal indicator etc. or from reflection of rear side etc., when natural light incident is arranged, the rectilinearly polarized light of reflection regulation polarization axle or the circularly polarized light of prescribed direction, and make other light transmissions, therefore brightness improving film and the stacked polaroid that forms of polaroid can be made light incident from light sources such as backlights, and the light that sees through of polarized light state is stipulated in acquisition, simultaneously, light beyond the described regulation polarized light state can not see through, and is reflected.By reflection horizon of being located at its rear side etc. the light that reflects on this brightness improving pellicular front is turned back, make it to incide once more on the brightness improving film, make its part or all light transmission as the regulation polarized light state, thereby increase the light that sees through the brightness improving film, simultaneously provide the polarized light that is difficult to absorb to polariscope, can be thereby increase in the light quantity of utilization in the image demonstration of liquid crystal display etc., and can improve brightness thus.Promptly, pass polariscope and make under the situation of light incident from the rear side of liquid crystal cells with backlight etc. not using the brightness improving film, have light with the inconsistent polarization direction of polariscopic polarization axle and be polarized mirror basically and absorb, thereby can't see through polariscope.That is, though can be different because of employed polariscopic characteristic, about 50% light can be polarized mirror and sponge, and therefore, the light quantity that can utilize in the liquid crystal image demonstration etc. will reduce, and cause the image deepening.Because the brightness improving film carries out following operation repeatedly, promptly, making the light with the polarization direction that can be polarized the mirror absorption is not to incide on the polariscope, but make such light on the brightness improving film, primary event take place, and then finish by reflection horizon of being located at its rear side etc. and to turn back, light is incided on the brightness improving film once more, like this, the brightness improving film only makes in the two reflection and the light that turns back, its polarization direction becomes and can see through by the polarized light of polariscopic polarization direction, provide it to polariscope simultaneously, therefore can in the demonstration of the image of liquid crystal indicator, use the light of backlight etc. effectively, thereby can make picture bright.

Also can between brightness improving film and described reflection horizon etc., scatter plate be set.Towards described reflection horizon etc., set scatter plate can be with the light scattering of passing through equably by the light of the polarized light state of brightness improving film reflection, eliminates polarized light state simultaneously and becomes the nonpolarized light state.Carry out following operation repeatedly, that is, and with light directive reflection horizon of natural light state etc., after being reflected by reflection horizon etc., once more by scatter plate and incide on the brightness improving film.So make polarized light return to the scatter plate of original natural light state by between brightness improving film and described reflection horizon etc., being provided with, can be in the brightness of keeping display frame, reduce the inequality of the brightness of display frame, thereby even and bright picture can be provided.By this scatter plate is set, thinking suitably to increase the repeated reflection number of times of first incident light, and utilizes the scattering function of scatter plate, and bright uniformly display frame can be provided.

As described brightness improving film, for example can use: the demonstration of thin-film multilayer laminated body that dielectric multilayer film or refractive index anisotropy are different and so on send as an envoy to the rectilinearly polarized light of regulation polarization axle see through and reflect the characteristic of other light film, cholesteric liquid crystal polymer oriented film or in the film substrate upper support the demonstrating any circularly polarized light reflection that will be in left-handed or the dextrorotation of film and so on of this aligned liquid-crystal layer and film that the film etc. of the characteristic of other light transmissions is suited.

Therefore, make the brightness improving film of the type that the rectilinearly polarized light of described regulation polarization axle sees through by utilization, make this see through light and directly incide on the polaroid, can when suppressing the absorption loss that causes by polaroid, light be seen through effectively along the direction consistent with polarization axle.On the other hand, utilize the brightness improving film that makes the type that circularly polarized light sees through of cholesteric and so on, though light is incided on the polariscope, but, from suppressing the viewpoint of absorption loss, preferably this circularly polarized light carry out rectilinearly polarized lightization, reenter afterwards and be mapped on the polaroid by polarizer.And, by using 1/4 wavelength sheet, circularly polarized light can be transformed to rectilinearly polarized light as this polarizer.

In broad wavelength coverages such as visible region, can play the polarizer of 1/4 wavelength sheet effect, for example can utilize following mode to obtain, that is, the phase separation layer that will play the phase separation layer of 1/4 wavelength sheet effect with respect to the light luminous energy of wavelength 550nm and show other phase difference characteristics for example can play the overlapping mode of the phase separation layer of 1/2 wavelength sheet effect etc.So the polarizer that is disposed between polaroid and the brightness improving film can be made of the phase separation layer more than 1 layer or 2 layers.

Also have, with regard to cholesteric, also can make up the material of different reflection wavelengths, constitute overlapping arrangement more than 2 layers or 3 layers, obtain member thus, thereby can obtain the circularly polarized light that sees through of broad wavelength coverage based on this at the wavelength coverage internal reflection circularly polarized light of broads such as visible region.

In addition, polaroid is as described polarized light divergence type polaroid, can be made of the member of stacked polaroid and the optical layers more than 2 layers or 3 layers.So, also can be to have made up reflection-type ellipsoidal polarizing plate that described reflection type polarizer or semi-transmission type polaroid and polarizer form or semi-transmission type ellipsoidal polarizing plate etc.

The stacked optical thin film of described optical layers on polaroid, can utilize that independent successively stacked mode forms in the manufacture process of liquid crystal indicator etc., but outstanding through being laminated in advance at aspects such as quality of stability or assembly operations to the polaroid of blooming, therefore have the advantage of the manufacturing process that can improve liquid crystal indicator etc.In stacked, can use suitable adhesion means such as bonding coat.When bonding described polaroid and other optical layers, their optic axis can adopt suitable arrangement angles according to target phase difference characteristic etc.

In addition, on each layers such as the optical thin film of adhesive optical film of the present invention or adhesive phase, also can make it to become member with ultraviolet absorption ability etc. by the modes such as mode of for example using salicylate based compound or benzo phenol (benzophenol) based compound, benzotriazole based compound or ultraviolet light absorbers such as cyanoacrylate based compound, nickel complex salt based compound to handle.

Adhesive optical film of the present invention is preferred for forming various image display devices such as liquid crystal indicator etc.The formation of liquid crystal indicator can be carried out according to mode in the past.Promptly, in general, liquid crystal indicator can form by the component parts such as combination of liquid crystals unit and adhesive optical film aptly and the illuminator that adds as required and the driving circuit of packing into etc., in the present invention, except using adhesive optical film this point of the present invention, be not particularly limited, can carry out according to mode in the past.For liquid crystal cells, for example can use TN type or any types such as STN type, π type.

The one or both sides that can be formed on liquid crystal cells have disposed the liquid crystal indicator of adhesive optical film, used the suitable liquid crystal indicators such as device of backlight or reflecting plate in illuminators.At this moment, optical thin film of the present invention can be arranged on the one or both sides of liquid crystal cells.When optical thin film was arranged on both sides, they both can be identical materials, also can be different materials.In addition, when forming liquid crystal indicator, can be on suitable position configuration suitable parts such as scatter plate, antiglare layer, antireflection film, fender, prism array, lens arra thin slice, light diffuser plate, backlight for example more than 1 layer or 2 layers.

Then, Organnic electroluminescent device (organic EL display) is described.Optical thin film of the present invention (polaroid etc.) also is suitable in organic EL display.In general, organic EL display is to stack gradually transparency electrode, organic luminous layer and metal electrode and form luminophor (organic electroluminescent body) on transparency carrier.Here, organic luminous layer is the duplexer of various organic films, and known have: for example duplexer of the duplexer of hole injection layer that is made of triphenylamine derivant etc. and the luminescent layer that is made of epipolic organic solids such as anthracenes or this kind luminescent layer and the electron injecting layer that is made of perillene derivant etc. or the various combinations such as duplexer of these hole injection layers, luminescent layer and electron injecting layer.

Organic EL display is to carry out luminous according to following principle, promptly, by on transparency electrode and metal electrode, applying voltage, injected hole and electronics in organic luminous layer, the energy excitation fluorescent material that produces by the compound of these holes and electronics, when the fluorescent material that is excited is got back to ground state, will radiate bright dipping.Middle recombination mechanism is identical with general diode, also can infer thus, and electric current and luminous intensity demonstrate with respect to impressed voltage and follow the stronger non-linear of rectification.

In organic EL display, in order to take out the light that produces in the organic luminous layer, at least one side's electrode must be transparent, will be used as anode by the transparency electrode that tin indium oxide transparent conductive bodies such as (ITO) is made usually.On the other hand, improve luminescence efficiency in order to carry out the injection of electronics easily, it is crucial using the less material of work function in negative electrode, uses metal electrodes such as Mg-Ag, Al-Li usually.

In the organic EL display with this kind formation, organic luminous layer is that film as thin as a wafer about 10nm constitutes by thickness.So organic luminous layer is also the same with transparency electrode, light is fully seen through basically.Consequently, when not luminous from the surperficial incident of transparency carrier and see through transparency electrode and organic luminous layer and can be once more penetrating to the face side of transparency carrier at the light of metal electrode reflection, therefore, when carrying out identification from the outside, the display surface of organic El device is as minute surface.

The face side that is included in the organic luminous layer luminous by applying voltage possesses transparency electrode and possesses in the organic EL display of the organic electroluminescent body that metal electrode forms in the rear side of organic luminous layer, the side that shows in transparency electrode is provided with polaroid, and between these transparency electrodes and polaroid polarizer is set.

Because having to make from outside incident and at the light of metal electrode reflection, polarizer and polaroid become the effect of polarized light, therefore owing to this polarized light effect has the effect that can't pick out the minute surface of metal electrode from the outside.Particularly, adopt 1/4 wavelength sheet to constitute polarizer, and the angle of the direction of polarized light of polaroid and polarizer is adjusted into π/4 o'clock, can cover the minute surface of metal electrode fully.

That is, the exterior light that is incident in this organic EL display has only the rectilinearly polarized light composition because of the existence of polaroid and sees through.This rectilinearly polarized light generally can be converted to elliptically polarized light by polarizer, and when polarizer be the angle of the direction of polarized light of 1/4 wavelength sheet and polaroid and polarizer when being π/4, will become circularly polarized light.

This circularly polarized light sees through transparency carrier, transparency electrode, organic film, with the metal electrode reflection, sees through organic film, transparency electrode, transparency carrier afterwards once more, converts rectilinearly polarized light once more to by polarizer.Then, because therefore the direction of polarized light quadrature of this rectilinearly polarized light and polaroid can't see through polaroid.Consequently the minute surface of metal electrode fully can be covered.

Embodiment

Below, utilize embodiment that the present invention is carried out specific description, but the present invention is not limited to these embodiment.Also have, part and % in each example are weight basis.

＜optical thin film 〉

Use wide visual field (WV) film of Fuji Photo Film Co Ltd.'s system.The WV film has the disc-like liquid crystal layer of disc-like liquid crystal molecule tilt orientation on as the cellulose-based macromolecule membrane of transparent base film.

In addition, isolate the tilted alignment layer of disc-like liquid crystal molecule, be determined at the characteristic of λ=590nm with the KOBRA-21ADH of prince's instrumentation machines corporation system from the WV film.Largest refractive index in the face is nx, and the refractive index of the direction of the direction quadrature of the largest refractive index in having face is ny, and the refractive index of thickness direction is nz.Thickness is d.Transparent supporting body is Δ nd=(nx-ny) * d=12nm, Rth=(nx-nz) * d=100nm.On the other hand, change incident angle-50 °～50 ° to the direction of the inclined light shaft of tilted alignment layer, measure phase differential, the result is Δ nd=30nm, Rth=150nm, average slope angle θ=17 °.

The transparent base film side of described WV film is implemented after saponification handles, utilize the polyethenol series bonding agent fit this saponification treated side and polyethenol series polariscope (a day eastern electrician (strain) system, SEG-5424WL).On the other hand, at polariscopic another side, utilize and above-mentioned same polyethenol series bonding agent, applying transparent protective film (triacetylcellulose film, thick 80 μ m) makes the optical thin film (polaroid of band viewing angle compensation film) with polaroid.

＜undercoat 〉

Acrylate ((strain) Japanese catalyst system, Port リ メ Application ト NK380) is prepared in use in toluene and solid constituent becomes 2% undercoat.

＜adhesive phase 〉

As base polymer, use and contain: acrylic acid: the solution (solid constituent 30%) of the acrylic acid series polymeric compounds of the weight-average molecular weight 2,000,000 that the multipolymer of acrylic acid 2-hydroxyl ethyl ester=100: 5: 0.1 (weight ratio) constitutes by butyl acrylate.In described acrylic acid series polymeric compounds solution, relative 100 parts of polymer solids compositions, add 4 parts of laughable Nat (コ ロ ネ one ト of the Japanese polyurethane corporate system as the isocyanate-based multi-functional compounds, Coronate) L and 0.5 part of adjuvant (SHIN-ETSU HANTOTAI's silicone (シ リ コ one Application) system, KBM403), be used to regulate the solvent (ethyl acetate) of viscosity, preparation binder solution (solid constituent 12%).Go up this binder solution of coating at release sheet (polyethylene terephthalate base material: ダ イ ヤ ホ イ Le MRF38, Mitsubishi Chemical's polyester), make its dried thickness become 25 μ m, use the heated air circulation type oven dried then, form adhesive phase.

Embodiment 1

(treatment with irradiation)

The use ultraviolet lamp (the CSUN system, UVC-321AM), to disc-like liquid crystal layer irradiation ultraviolet radiation (the illumination 40mW/cm of optical thin film with described polaroid ², integration light quantity 300mJ/cm ²).Carry out 10 (integration light quantity 3000mJ/cm of this ultraviolet ray irradiation ²).The integration light quantity is the integration light quantity at wavelength 350nm.

(making of adhesive optical film)

Utilize wire bar,, form undercoat (thick 20nm) afterwards, fit and formed the release sheet of adhesive phase, make adhesive optical film at the surface applied silane coupling agent of the disc-like liquid crystal layer of implementing described treatment with irradiation.

Comparative example 1

In embodiment 1, except not implementing treatment with irradiation, make adhesive optical film similarly to Example 1.

To the disc-like liquid crystal layer of the front and back of carrying out described treatment with irradiation, and the adhesive optical film that obtains, carry out following evaluation.The results are shown in Table shown in 1.

＜hardness 〉

Utilize following apparatus to measure the skin hardness of disc-like liquid crystal layer.

Analytical equipment: nano hardness meter (Na ノ イ Application デ Application one) (the MTS corporate system, SA2)

Pressure head: the diamond penetrator of triangular pyramid type

Go into diamond penetrator from a side pressure of disc-like liquid crystal layer, at this moment the stress determination hardness from pressure head.Hardness when measuring compression distance 100nm.Carry out 10 times and measure, put down in writing their mean value.

＜remaining polymerism unsaturated group: absorbance ratio 〉

Utilize following apparatus to measure remaining polymerism unsaturated group in the disc-like liquid crystal layer.

Analytical equipment: FT-IR (Thermo Nicolet corporate system, Magna750)

Assay method: ATR method

IR crystallization: ZnSe

Incident angle: 45 °

Measure wavelength: 4000～650cm ^-1

Integral number of times: 128 times

Detecting device: DTGS

Calculate the 1510cm of the IR spectrum that obtains ^-1(aromatic series source) and 811cm ^-1The absorbance in (carbon-to-carbon double bond source) is than (811cm ^-1/ 1510cm ^-1).

＜inequality 〉

(size: 300mm * 220mm) be disposed on the backlight makes a side of adhesive phase become upside with the adhesive optical film that obtains.In 80 ℃ atmosphere, light backlight, utilize following benchmark, whether visual valuation produces the window frame inequality at the periphery (in edge 10mm) of optical thin film.To lighting hours is 100 hours, 170 hours, 340 hours, confirms.

Zero: periphery does not have inequality.

*: periphery has inequality.

[table 1]

	Treatment with irradiation		Estimate
										Hardness (GPa)		Remaining polymerism unsaturated group: absorbance ratio		The window frame inequality
			Have or not	Integration light quantity (mJ/cm 2)	Before the processing	After the processing	Before the processing	After the processing	100 hours								170 hours	340 hours
	Embodiment
1		Have	3000	0.155	0.195	0.24	0.15	○	○	○
	Comparative example 1										Do not have	-	0.155	-	0.24	-	○	×	×

Claims (8)

1. the manufacture method of an adhesive optical film, it comprises operation as described below, that is: has this disc-like liquid crystal layer in the one side of transparent base film by the optical thin film of disc-like liquid crystal layer that the disc-like liquid crystal compound with polymerism unsaturated group is orientated, is solidified to form, adhesive phase is set, it is characterized in that

Before the operation that adhesive phase will be set is implemented, to disc-like liquid crystal layer irradiating ultraviolet light and/or visible light.

2. the manufacture method of adhesive optical film according to claim 1 is characterized in that,

After irradiating ultraviolet light and/or visible light, implement to be provided with before the operation of adhesive phase, have: the operation that undercoat is set.

3. the manufacture method of adhesive optical film according to claim 1 is characterized in that,

Irradiates light comprises ultraviolet light, and the integration light quantity of wavelength 350nm is 10～10000mJ/cm ²

4. the manufacture method of adhesive optical film according to claim 1 is characterized in that,

The one side that forms the transparent base film of disc-like liquid crystal layer implements milled processed or is formed with alignment films.

5. the manufacture method of adhesive optical film according to claim 1 is characterized in that,

Optical thin film is laminated with polariscope in the one side of the transparent base film of a side that does not form the disc-like liquid crystal layer.

6. the manufacture method of adhesive optical film according to claim 1 is characterized in that,

After the operation that adhesive phase will be set is implemented, have: in the operation of a laminated polarizing mirror of the transparent base film of a side that does not form the disc-like liquid crystal layer.

7. adhesive optical film, it is to utilize any adhesive optical film that described manufacture method obtains in the claim 1～6.

8. image display device, it is the image display device that uses a described adhesive optical film of claim 7 at least.

Images