CN1661394A - Antistatic adhering optical film, its mfg. method and image display - Google Patents
Antistatic adhering optical film, its mfg. method and image display Download PDFInfo
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- CN1661394A CN1661394A CN2005100521866A CN200510052186A CN1661394A CN 1661394 A CN1661394 A CN 1661394A CN 2005100521866 A CN2005100521866 A CN 2005100521866A CN 200510052186 A CN200510052186 A CN 200510052186A CN 1661394 A CN1661394 A CN 1661394A
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- film
- antistatic
- optical film
- liquid crystal
- polaroid
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
- G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
- G02B5/3033—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid
- G02B5/3041—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid comprising multiple thin layers, e.g. multilayer stacks
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/133528—Polarisers
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1337—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers
- G02F1/133753—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers with different alignment orientations or pretilt angles on a same surface, e.g. for grey scale or improved viewing angle
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/20—Properties of the layers or laminate having particular electrical or magnetic properties, e.g. piezoelectric
- B32B2307/21—Anti-static
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/40—Properties of the layers or laminate having particular optical properties
- B32B2307/42—Polarizing, birefringent, filtering
Abstract
The invention provides an antistatic adhesive optical film in which an antistatic layer and an adhesive layer overlie at least one surface of an optical film in this order, the antistatic layer contains a metal oxide.
Description
Technical field
The present invention relates in the one side at least of optical thin film lamination successively the antistatic adhering optical film of antistatic backing and adhesive phase.Also further relate to image display devices such as the liquid crystal indicator that used above-mentioned antistatic adhering optical film, organic EL display, PDP.As above-mentioned optical thin film, list polaroid, phase difference film, optical compensating gage, briliancy and improve film, the laminated film etc. of these films that also further listed lamination.
Background technology
LCD etc. are seen at the both sides of liquid crystal cell configuration polarizer from its image forming mode and are absolutely necessary, generally adhere to polaroid.In addition, on liquid crystal display except using polaroid, for the display quality that improves display also uses various optical elements.For example, use the phase difference film of anti-coloring, the briliancy that is used to improve the visual angle expansion film of visual angle of liquid crystal display and improve the contrast of display to improve film etc.These films are generically and collectively referred to as optical thin film.
These optical thin films arrive usually before the consumer during at its surperficial coating surface protective film, to avoid in transportation or manufacturing process, making optical thin film surface damage or band dirt.This surface protective film is attached to also to be peeled off after LCD etc. goes up sometimes, or identical or other surface protective film of fitting once again after peeling off once.And, when peeling off this surface protective film, producing static, the circuit that has LCD screen etc. is by the problem of this electrostatic breakdown.In addition, the array element inner to LCD screen impacts, and it impacts also further for the orientation of liquid crystal, brings out badly, has this problem.In addition, when not only surface protective film is peeled off, also according to manufacturing process and consumer's using method, owing to same problem takes place in optical thin film friction each other.In order to address the above problem, proposed optical thin films such as polaroid are given the scheme of static electricity resistance.For example, the optical thin film that the optical thin film of the band antistatic backing of antistatic backing is set on the optical thin film surface, transparency conducting layer is set in the one or both sides of optical thin film is disclosed.
On the other hand, on liquid crystal cell, during optical film adhered, use bonding agent usually.In addition, bonding between optical thin film and liquid crystal cell or optical thin film can reduce optical loss usually, uses the various materials of bonding agent driving fit for this reason.In such occasion, owing to have the advantage that the fixed optics film does not need drying process etc., the therefore general adhesive optical film that bonding agent is set as adhesive phase in advance in a side of optical thin film that uses.
The scheme of static electricity resistance has also been proposed to give about above-mentioned adhesive optical film.For example, proposed to make the antiglare layer on polaroid surface to contain electroconductive particle when giving static electricity resistance, formed the optical thin film (patent documentation 1) of adhesive phase at its reverse side antiglare layer., in the method for patent documentation 1, keep difficulty, deficient in stability as the characteristic of antiglare layer.In addition, the occasion of antistatic backing is set on adhesive optical film, bad in order to eliminate in the orientation of the inner liquid crystal cell that produces by impressed voltage that causes of screen, preferably between optical thin film and adhesive phase, antistatic backing is set.In addition, between optical thin film and adhesive phase, be provided with the antistatic adhering optical film of antistatic backing, have that bonding agent lacks to fall, a problem of residual paste or on re-workability, have problems.In addition, as the method for optical thin film being given electrostatic-proof function, proposed in adhesive phase, to contain the method (patent documentation 2) of conductive material.The method of patent documentation 2 is difficult to keep the characteristic as adhesive phase, deficient in stability.
[patent documentation 1] spy opens flat 10-239521 communique
[patent documentation 2] spy opens the 2003-294951 communique
Summary of the invention
The objective of the invention is, provide a kind of one side at least at optical thin film successively lamination the antistatic adhering optical film of antistatic backing, adhesive phase, this antistatic adhering optical film is difficult for causing that bonding agent lacks to fall, re-workability is good.Purpose provides its manufacture method in addition.In addition, the objective of the invention is, the image display device that has used this antistatic adhering optical film is provided.
The inventor is for solving the following antistatic adhering optical film that found that of the diligent repeatedly investigation of above-mentioned problem, to such an extent as to finished the present invention.
That is, the present invention relates to a kind of antistatic adhering optical film, be one side at least at optical thin film by described order lamination the antistatic adhering optical film of antistatic backing, adhesive phase, above-mentioned antistatic backing contains metal oxide.
The antistatic adhering optical film of the invention described above, bonding agent lack to fall and the residual main reason of paste during from the reprocessing of liquid crystal display thinks that the adaptation that is to be provided with optical thin film that antistatic backing causes and adhesive phase is low.Its result improves adaptation by use metal oxide in antistatic backing.In view of the above when handling antistatic adhering optical film, for the contact of film end, the part that can reduce bonding agent significantly lack to fall and the paste during from the reprocessing of liquid crystal display residual, the processing that improves antistatic adhering optical film.In addition; antistatic backing is owing to be arranged between optical thin film and the adhesive phase; therefore anti-static effect is good, can suppress the generation that surface protective film is peeled off the static that the friction of the static that causes and optical thin film causes, and can prevent that the orientation of the breakage of circuit and liquid crystal is bad.In addition, optical thin film, adhesive phase can be kept characteristic separately, and stability is also excellent.
In above-mentioned antistatic adhering optical film, preferably contain the Sn system compound as metal oxide.As the Sn system compound, the tin oxide of preferred doped indium.
In above-mentioned antistatic adhering optical film, preferred antistatic backing also further contains the bond composition.When forming antistatic backing,, can improve the adaptation of optical thin film and adhesive phase more by use the bond composition with metal oxide.As above-mentioned bond composition, the preferred at least a kind of resin that uses the group that is selected from polyurethane series resin, polyester based resin and acrylic resin and constitutes.
In above-mentioned antistatic adhering optical film, the preferred adhesive layer adopts acrylic adhesive to form.
In addition, the present invention relates to a kind of manufacture method of antistatic adhering optical film, be the method for making above-mentioned antistatic adhering optical film, comprise: be dispersed with the operation of the dispersion liquid of metal oxide, the operation of dry this dispersion liquid formation antistatic backing and the operation that on this antistatic backing, forms adhesive phase in the coating of one side at least of optical thin film.
Past adopts vacuum evaporation mode, sputter mode or ion injection mode etc. to form transparency conducting layer as the method that forms antistatic backing on the optical thin film surface, but these method manufacturing cost height, productivity is bad.According to method for making of the present invention, owing to can adopt coating to wait rubbing method to form antistatic backing, so productivity is good.
In addition, the present invention relates to a kind of image display device, this device comprises above-mentioned antistatic adhering optical film.Antistatic adhering optical film of the present invention is used in combination this film of 1 or multi-disc according to the various operational versions of image display devices such as liquid crystal indicator.
The simple declaration of accompanying drawing
Fig. 1 is an example of the sectional view of antistatic adhering optical film of the present invention.
Symbol description
1 optical thin film; 2 antistatic backings; 3 adhesive phases.
Embodiment
Antistatic adhering optical film of the present invention as shown in Figure 1, the one side of optical thin film 1 by described order lamination antistatic backing 2, adhesive phase 3.Fig. 1 expresses the situation that is provided with adhesive phase 3 in the one side of optical thin film 1, but adhesive phase 3 also can have on the two sides of optical thin film.In addition, the adhesive phase 3 about other faces also can have antistatic backing 2.
As the antistatic agent of the antistatic backing 2 that forms antistatic adhering optical film of the present invention, use metal oxide.In addition, list Sn system, antimony oxide system, indium oxide system, Zinc oxide etc. as metal oxide.Preferred Sn system among them.For example except tin oxide, also list the tin oxide of antimony dopant, the tin oxide of doped indium, the tin oxide of adulterated al, the tin oxide of Doped Tungsten, the complex of titanium dioxide-cerium oxide-tin oxide, the complex of titanium dioxide-tin oxide etc. as the metal oxide of Sn system.Metal oxide is particulate normally, and its shape is preferably used particle shape or needle-like.Atomic mean grain size is about 1-100nm, preferably 2-50nm.
In addition, optical thin films such as polaroid dissolve in nonaqueous organic solvent and rotten, deterioration, and optical characteristics degenerates.Optical thin film is poor owing to organic solvent resistance like this, so metal oxide preferably uses with the form that is dispersed in the dispersion liquid (colloidal sol) in the hydrophilic solvent.As the hydrophilic solvent preferred water.Except water, can also contain hydrophilic organic solvent.For example list alcohols such as methyl alcohol, ethanol, n-propanol, isopropyl alcohol, normal butyl alcohol, isobutyl alcohol, sec-butyl alcohol, the tert-butyl alcohol, n-amyl alcohol, isoamylol, sec-amyl alcohol, tert-pentyl alcohol, 1-ethyl-1-propyl alcohol, 2-methyl-1-butene alcohol, n-hexyl alcohol, cyclohexanol as hydrophilic organic solvent.
In addition, as the formation material of antistatic backing, with improve antistatic agent formed property by film, be purpose to the adaptation of optical thin film etc., also can add the bond composition with metal oxide as above-mentioned antistatic agent.In the occasion of using metal oxide with dispersion, use the bond composition of water-soluble or water dispersible.As the example of bond composition, listing polyurethane series resin, polyester based resin, acrylic resin, polyethers is resin, cellulose-based resin, polyvinyl alcohol resin, epoxy resin, polyvinyl pyrrolidone, polystyrene resin, polyglycol, pentaerythrite etc.Special optimization polyurethane is resin, polyester based resin, acrylic resin.These bond compositions can meet its purposes ground aptly and use more than a kind or 2 kinds.The consumption of bond composition also depends on the kind of metal oxide, but is below 200 weight portions with respect to metal oxide 100 weight portions usually, is preferably the 5-150 weight portion.
The surface resistivity of above-mentioned antistatic backing preferably 1 * 10
12Below Ω/, further preferably 1 * 10
11Below Ω/.Surpass 1 * 10 in surface resistivity
12The occasion of Ω/, electrostatic-proof function is insufficient, owing to surface protective film peel off or the friction of optical thin film produces static electrification, cause that sometimes the orientation of liquid crystal cell damage of circuit or liquid crystal is bad.
Bonding agent as the adhesive phase 3 that forms antistatic adhering optical film of the present invention, restriction especially for example can suit to select to use with the bonding agent as base polymer such as the polymkeric substance of acrylic acid series polymeric compounds, silicone-based polymkeric substance, polyester, polyurethane, polyamide, polyethers, fluorine system and rubber system etc.Particularly preferably use the optical transparence excellence, show the bonding agent that the suitable wetting state and adhesion characteristic, weatherability and the thermotolerance of coherency and connectivity etc. are excellent.Preferably use acrylic adhesive as the bonding agent that shows such feature.
Acrylic adhesive will be that the acrylic acid series polymeric compounds of main framing is as base polymer with the monomeric unit of (methyl) alkyl acrylate.(methyl) acrylate refers to acrylate and/or methacrylate, and (methyl) of the present invention is the same meaning.The average carbon number that constitutes alkyl main framing, (methyl) alkyl acrylate of acrylic acid series polymeric compounds is about 1-12, concrete example as (methyl) alkyl acrylate can list (methyl) methyl acrylate, (methyl) ethyl acrylate, (methyl) butyl acrylate, (methyl) 2-EHA etc., and they can be single or be used in combination.Wherein, the carbon number of preferred alkyl is (methyl) alkyl acrylate of 1-9.
In aforesaid propylene acid based polymer, be purpose to improve connectivity and thermotolerance, by the various monomers of copolymerization introducing more than a kind.Object lesson as such comonomer for example lists (methyl) acrylic acid 2-hydroxy methacrylate, (methyl) acrylic acid 2-hydroxy propyl ester, (methyl) acrylic acid 4-hydroxyl butyl ester, the own ester of (methyl) acrylic acid 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 and (4-hydroxymethyl cyclohexyl)-hydroxyl monomers such as methacrylate; (methyl) acrylic acid, (methyl) acrylic acid carboxyl ethyl ester, (methyl) acrylic acid carboxyl 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 and allyl sulphonic acid, 2-(methyl) acrylamide-2-methyl propane sulfonic acid, (methyl) acrylamide propane sulfonic acid, (methyl) acrylic acid sulfo group propyl ester, (methyl) acryloxy naphthalene sulfonic acids etc. contain the sulfonic group monomer; Phosphorous acidic group monomer of 2-hydroxyethyl acryloyl group phosphate etc. or the like.
In addition, examples of monomers as the modification purpose also lists (methyl) acrylamide, N, and (N-replacement) acid amides of N-dimethyl (methyl) acrylamide, N-butyl (methyl) acrylamide and N-methylol (methyl) acrylamide, N-hydroxymethyl-propane (methyl) acrylamide etc. is a monomer; (methyl) acrylic-amino ethyl ester, (methyl) acrylic acid N, (methyl) acrylic acid alkyl aminoalkyl ester of N-dimethylamino ethyl ester, (methyl) acrylic acid tert-butyl group amino ethyl ester etc. is a monomer; (methyl) alkoxyalkyl acrylate of (methyl) acrylic acid methoxyl ethyl ester, (methyl) acrylic acid ethoxy ethyl ester etc. is a monomer; The succinimide of N-(methyl) acryloyl-oxy methylene succinimide and N-(methyl) acryloyl group-6-hydroxyl hexa-methylene succinimide, N-(methyl) acryloyl group-8-hydroxyl eight methylene succinimides, N-acryloyl morpholine etc. is a monomer etc.
And can use the ethene base system monomer of 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-vinyl caprolactone etc.; The acrylic acid cyano group ester of vinyl cyanide, methacrylonitrile etc. is a monomer; The acrylic monomer that contains epoxy radicals of (methyl) glycidyl acrylate etc.; The glycol of (methyl) polyalkylene glycol acrylate ester, (methyl) acrylic acid polypropylene glycol ester, (methyl) acrylic acid methoxyl glycol ester, (methyl) acrylic acid methoxyl polypropylene glycol ester etc. is an acrylate monomer; The acrylic ester monomer of (methyl) tetrahydrofurfuryl acrylate, fluoro (methyl) acrylate, (methyl) silicon Acrylote oxyalkyl ester and acrylic acid 2-methoxyl ethyl ester etc. etc.
Among them,, from the connectivity of liquid crystal cell, the aspect that engages permanance are considered, preferably use the carboxylic monomer that contains of acrylic acid etc. as the purposes of optical thin film.
The ratio of the above-mentioned comonomer in the acrylic acid series polymeric compounds is restriction especially not, but weight rate is preferably about 0.1-10%.
The mean molecular weight of acrylic acid series polymeric compounds is restriction especially not, and weight-average molecular weight is preferably about 300,000-2,500,000.The manufacturing of aforesaid propylene acid based polymer can be adopted various known gimmick manufacturings, for example can suit to select the radical polymerization of mass polymerization, solution polymerization process, suspension polymerization etc.As radical polymerization initiator, can use the various known radical polymerization initiator of azo system, peroxidating system.Temperature of reaction is generally about 50-80 ℃, and the reaction time is defined as 1-8 hour.In addition, preferred solution polymerization among above-mentioned autofrettage as the solvent of acrylic acid series polymeric compounds, is generally used ethyl acetate, toluene etc.Solution concentration is decided to be about 20-80 weight % usually.
As rubber is the base polymer of bonding agent, and for example listing natural rubber, isoprene rubber, styrene-butadiene and be rubber, reclaimed rubber, polyisobutylene is that rubber and styrene-isoprene-phenylethene are that rubber, s-B-S are rubber etc.As the base polymer of silicone-based adhesive, for example list dimethyl polysiloxane, diphenyl polysiloxane etc., these base polymers also can use the material of having introduced functional groups such as carboxyl.
In addition, above-mentioned bonding agent is preferably the adhesive composition that contains crosslinking chemical.List organic system crosslinking chemical and multi-functional metallo-chelate as the polyfunctional compound that can be coupled in the bonding agent.As the organic system crosslinking chemical, listing epoxy and be crosslinking chemical, isocyanate-based crosslinking chemical, imines is crosslinking chemical etc.As organic system crosslinking chemical preferred isocyanate is crosslinking chemical.Multi-functional metallo-chelate is polyvalent metal and organic compound covalent bond or complex bound material.As polyvalent metal atom, list Al, Cr, Zr, Co, Cu, Fe, Ni, V, Zn, In, Ca, Mg, Mn, Y, Ce, Sr, Ba, Mo, La, Sn, Ti etc.List oxygen atom etc. as the atom in covalent bond or the complex bound organic compound, list Arrcostab, alcoholic compound, carboxylic acid compound, ether compound, ketonic compound etc. as organic compound.
The cooperation ratio of the base polymer of acrylic acid series polymeric compounds etc. and crosslinking chemical does not limit especially, but usually with respect to base polymer (solid constituent) 100 weight portions, crosslinking chemical (solid constituent) is preferably about the 0.01-10 weight portion, more preferably about the 0.1-5 weight portion.
And, in above-mentioned bonding agent, can suit to use bonding imparting agent, plastifier as required, comprise glass fibre, beaded glass, metal powder, other the filling agent, pigment, colorant, filling agent, antioxidant, ultraviolet light absorber, silane coupling agent etc. of inorganic powder etc., also can use various adjuvants in that the scope that does not break away from the object of the invention is suitable in addition.In addition, also can make and contain particulate and the diffusible adhesive phase of display light etc.
As the employed optical thin film 1 of antistatic adhering optical film of the present invention, use the optical thin film that when image display devices such as formation liquid crystal indicator, uses, its kind is restriction especially.For example list polaroid as optical thin film.The general polaroid that has transparent protective film at the one or both sides of polarizer that uses of polaroid.
Polarizer does not limit especially, can use various.As polarizer, for example enumerate the bitintability material of the hydrophilic macromolecule thin film adsorbs iodine of the polyvinyl alcohol film of sening as an envoy to, part dimethoxym ethane polyvinyl alcohol film, ethylene vinyl acetate copolymer pastern branch ketonize film etc. or bitintability dyestuff and unilateral stretching film, the processed thing of polyvinyl alcohol (PVA) and the polyenes such as desalination acid treatment thing of Polyvinylchloride be oriented film etc.Among them, preferably comprise the polarizer of the bitintability material of polyvinyl alcohol film and iodine etc.The thickness of these polarizers is restriction especially not, but generally is about 5-80 μ m.
With polyvinyl alcohol film with iodine staining and unilateral stretching polarizer, for example dye by dipping polyvinyl alcohol (PVA) in the aqueous solution of iodine, thereby and the 3-7 that is drawn into original length doubly can make.Also can be immersed in the aqueous solution of the potassium iodide that also can contain boric acid and zinc sulfate, zinc chloride etc. as required etc.And, before dyeing, also polyvinyl alcohol film can be immersed in the water as required and washing.By the washing polyvinyl alcohol film, except the dirt or anti blocking agent that can wash the polyvinyl alcohol film surface, thereby also have by making the polyvinyl alcohol film swelling prevent the uneven effect of uneven dyeing etc.Stretching can be carried out after with iodine staining, on one side also can stretch by an Edge Coloring, uses iodine staining after can also stretching.In the aqueous solution of boric acid and potassium iodide etc. or water-bath, also can stretch.
The material of the transparent protective film that is provided with as the single face that is formed on above-mentioned polarizer or two sides, the material that preferably clear, physical strength, thermal stability, water proof branch property, isotropy etc. are excellent.For example list the styrenic, polycarbonate based polymer etc. of acrylic acid series polymeric compounds, polystyrene and acrylonitrile styrene copolymer (AS) etc. of the cellulose-based polymkeric substance, polymethylmethacrylate etc. of polyester based polymer, diacetyl cellulose and the tri acetyl cellulose etc. of polyethylene terephthalate and PEN etc.In addition, the example as the polymkeric substance that forms above-mentioned transparent protective film also lists tygon; polypropylene; polyolefin with ring system or norborene structure; the polyolefin polymkeric substance of ethylene propylene copolymer and so on; vinyl chloride-based polymer; the acid amides based polymer of nylon and aromatic polyamide etc.; 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 vinyl butyral based polymer; the allylate based polymer; the polyoxymethylene based polymer; the epoxy based polymer; perhaps admixture of above-mentioned polymkeric substance etc.Transparent protective film also can be as the cured layer of the resin of the heat curing-type of acrylic acid series, urethane system, acrylic acid urethane system, epoxy system, silicone-based etc., ultraviolet hardening and is formed.
List in addition the spy open in the 2001-343529 communique (WO01/37007) record thin polymer film, for example contain (A) and have at side chain and replace and/or the thermoplastic resin of non-substituted imine base and (B) have at side chain and replace and/or the resin combination of the thermoplastic resin of non-substituted-phenyl and itrile group.List the film that contains isobutylene, comprises the resin combination of the alternating copolymer of N-methyl maleimide and acrylonitrile styrene copolymer as object lesson.Film can use the film of extrusion product of comprising resin combination etc.
The decision that can suit of the thickness of protective film, but generally consider it is about 1-500 μ m from the aspect of the operation of intensity and the property handled etc., film etc.Be preferably 5-200 μ m especially.
As protective film, consider cellulose-based polymkeric substance such as preferred tri acetyl cellulose from the aspect of polarized light property and permanance etc.Preferred especially tri acetyl cellulose film.The occasion of protective film is set in the both sides of polarizer, can uses the protective film that comprises the same polymer material, also can use the protective film that comprises different polymeric material etc. in its inside and outside.Above-mentioned polarizer and protective film are bonding by aqueous binder etc. usually.Can list as the water-based cement that isocyanate-based cement, polyvinyl alcohol (PVA) bind cement, gelatin is cement, ethene base system latex system, aqueous polyurethane, waterborne polyester etc.
Also can to the face of the not bonding polarizer of above-mentioned transparent protective film implement strengthened coat or antireflection handle, anti-adhere to or with diffusion so that anti-reflective be the processing of purpose.
It is that purpose is implemented that strengthened coat is handled to prevent to injure polaroid surface etc., for example can form excellent curing such as the hardness of suitable ultraviolet curing resin of acrylic acid series, silicone-based etc. and lubricating property by film in the mode that is attached to the transparent protective film surface etc.Antireflection is handled preventing that the outer reflection of light on the polaroid surface from being that purpose is implemented, and can reach by forming according to the antireflective film of standard in the past etc.In addition, anti-adhesion processing is that purpose is implemented with the adhesion that prevents other members and adjoining course.
In addition; the counnter attack optical processing damages the visuality etc. that polaroid sees through light to prevent light outside the polaroid surface reflection be that purpose is implemented; for example, the suitable way of asperities mode by adopting sandblast mode and embossing Collator Mode and transparent atomic fit system etc. is given the micro concavo-convex structure to the transparent protective film surface and can be formed.As for forming the particulate that above-mentioned surperficial micro concavo-convex structure makes it to contain, for example use the situation that electric conductivity is also arranged inorganic of the silicon dioxide that comprises mean grain size 0.5-50 μ m, aluminium oxide, titanium dioxide, zirconia, tin oxide, indium oxide, cadmium oxide, antimony oxide etc. to be particulate, comprise the transparent particulate of the organic system particulate (comprising microballon) etc. of crosslinked or uncrosslinked polymkeric substance etc.Form the occasion of surperficial micro concavo-convex structure, atomic use amount generally is about the 2-50 weight portion with respect to transparent resin 100 weight portions that form surperficial micro concavo-convex structure, preferred 5-25 weight portion.Thereby anti-reflective layer also can be the double diffusion polarizing piece of doing sees through the diffusion layer (vision expanded functionality etc.) that light enlarges vision etc.
Above-mentioned anti-reflection layer, antiblocking layers, diffusion layer and anti-reflective layer etc. except can be arranged on transparent protective film originally on one's body, also can be separately as optical thin film as being provided with the layer of transparent protective film split.
In addition, as optical thin film, for example list reflector plate and the anti-sheet, phase difference film (comprising 1/2 wavelength sheet and 1/4 wavelength sheet equiwavelength sheet), vision compensation film, briliancy of seeing through improves the optical thin film that becoming of film etc. is often used for forming the optical layers of liquid crystal indicator etc.These optical thin films can also use more than 1 layer or 2 layers at above-mentioned polaroid superimposed layer when practicality except can using as optical thin film singlely.
Particularly preferably on the polaroid further the reflection type polarizer that forms of lamination reflector plate or semi-penetration sheet or semi-transmission type polaroid, on the polaroid further the ellipsoidal polarizing plate that forms of lamination phase difference film or circular polarizing disk, on the polaroid further the wide viewing angle polaroid that forms of lamination vision compensation film or on polaroid further the lamination briliancy improve the polaroid that film forms.
Reflection type polarizer is the polaroid that is provided with the reflection horizon on polaroid, it is used to form the liquid crystal indicator etc. of the type that reflection shows from the incident light of visual side (demonstration side), thereby has the advantage that can omit the built-in slimming of easily seeking liquid crystal indicator that waits light source backlight etc.The formation of reflection type polarizer can adopt the suitable way of setting up the mode etc. in the reflection horizon that comprises metal etc. in the one side of polaroid by protective clear layer etc. to carry out as required.
Concrete example as reflection type polarizer lists: the one side of the transparent protective film of having handled in delustring is as required set up the paper tinsel that comprises reflective metal such as aluminium or evaporated film and is formed the polaroid in reflection horizon etc.In addition, also enumerate the above-mentioned transparent protective film of sening as an envoy to and contain particulate and make surperficial micro concavo-convex structure, have the polaroid etc. in the reflection horizon of micro concavo-convex structure thereon.The reflection horizon of above-mentioned micro concavo-convex structure makes the incident light diffusion by diffuse reflection, prevents the outward appearance of directionality and flash of light, has and can suppress the irregular advantage of light and shade etc.In addition, contain atomic protective film, when this film sees through, spread, also have and more can suppress the irregular advantage of light and shade etc. at incident light and reflected light thereof.The formation in reflection horizon of the surperficial micro concavo-convex structure of the surperficial micro concavo-convex structure of reflection transparent protective film, for example method by directly setting up metal at transparency protected laminar surface with the mode that suits of vacuum evaporation mode, ion injection mode, sputter mode and plating mode etc. etc. and can carrying out.
Reflector plate replaces directly giving the mode on the transparent protective film of above-mentioned polaroid, also can be so that forms such as the reflector plate use that the reflection horizon forms to be set on the suitable film according to this transparent membrane standard.The reflection horizon comprises metal usually; therefore from the reflectivity that prevents to cause by oxidation reduce, in addition the initial stage reflectivity the long-term aspect that continues and avoid the considerations such as aspect of setting up separately of protective seam, preferably its reflecting surface is with the user mode of the state of linings such as transparent protective film and polaroid.
The semi-transmission type polaroid is used reflective layer reflects light by being formed in above-mentioned, and the semi-transmission type reflection horizon of the semi-permeable mirror that sees through etc. and can obtaining.The semi-transmission type polaroid is arranged on the inboard of liquid crystal cell usually, can form: the occasion of under brighter atmosphere, using liquid crystal indicator etc., make from visual side (demonstration side) thus incident light reflection display image, under darker atmosphere, use the built-in light source of grade backlight at the back side be built in the semi-transmission type polaroid and the liquid crystal indicator of this type of display image etc.That is, the semi-transmission type polaroid uses the energy that waits light source backlight to saving under bright atmosphere, and the formation of the liquid crystal indicator of use built-in light source under darker atmosphere and spendable type etc. is useful.
Explanation further lamination phase difference film forms on polaroid ellipsoidal polarizing plate or circular polarizing disk.Linear polarization being become elliptical polarized light or rotatory polarization, elliptical polarized light or rotatory polarization are become linear polarization or changing the occasion of the polarization direction of linear polarization, use phase difference film etc.Particularly as linear polarization being become rotatory polarization, rotatory polarization being become the phase difference film of linear polarization, use said 1/4 wavelength sheet (also cry λ/4 slice).1/2 wavelength sheet (also cry λ/2 slice) is used in the occasion of the polarization direction that changes linear polarization usually.
Ellipsoidal polarizing plate compensation (preventing) is because painted (the blue or Huang) that the birefringence of the liquid crystal layer of STN Super TN (STN) type liquid crystal indicator produces, and is used to not have the occasion of above-mentioned painted white and black displays etc. effectively.And, controlled the ellipsoidal polarizing plate of three-dimensional refractive index, what produce in the time of also can compensating (preventing) from the oblique picture of seeing liquid crystal indicator is painted, so preferred.Circular polarizing disk for example can be effectively used to occasion that the tone of the image of the reflection-type liquid-crystal display device of color display is adjusted etc., but also has the function of reflecting of preventing.
List as phase difference film: with the macromolecule starting material carry out unidirectional or two-way stretch handle the oriented film of the birefringent film that forms, liquid crystal polymer, with film support the phase difference film etc. of oriented layer of liquid crystal polymer.The thickness of phase difference film is not restriction especially also, but is generally about 20-150 μ m.
As the macromolecule starting material, for example list polyvinyl alcohol (PVA), polyvinyl butyral, polymethyl vinyl ether, polyacrylic acid hydroxyethyl ester, hydroxy ethyl cellulose, hydroxy propyl cellulose, methylcellulose, polycarbonate, polyacrylate, polysulfones, polyethylene terephthalate, PEN, polyethersulfone, polyphenylene sulfide, polyphenylene oxide, polyene propyl group sulfone, polyamide, polyimide, polyolefin, Polyvinylchloride, cellulose-based polymkeric substance, norbornene resin, perhaps their binary system, the various multipolymers of ternary system, graft copolymer, admixture etc.These macromolecule starting material wait by stretching becomes orientation thing (oriented film).
As liquid crystal polymer, the linearity atomic group (the former mesogen of liquid crystal) that for example lists the conjugacy of giving liquid crystal aligning is introduced in the main chain of polymkeric substance or the various liquid crystal polymer of backbone chain type on the side chain or side chain type etc.As the object lesson of main chain liquid crystalline polymer, list with the spatial portion of giving bendability combine the liquid crystal original hase structure, for example the polyester to the row orientation is liquid crystal polymer, disc-like liquid crystal polymkeric substance and cholesteric polymkeric substance etc.Concrete example as the liquid crystal polymer of side chain type, can enumerate by comprising with polysiloxane, polyacrylate, polymethacrylate or poly-malonate as main chain backbone, with the atomic group of conjugacy interval group part, having and comprise and giving to liquid crystal polymer of the former part of liquid crystal of the para-oriented ring shape compound unit of row orientation etc. as side chain.These liquid crystal polymers for example can obtain by friction treatment is carried out on the surface of the film that is formed at polyimide on the glass plate or polyvinyl alcohol (PVA) etc., perhaps on the orientation process face of the film that forms by oblique evaporation monox etc. with the solution expansion of liquid-crystalline polymer, and it is heat-treated carries out.
Phase difference film, can be the painted and vision that causes with for example birefringence of various wavelength sheets or liquid crystal layer etc. be compensated for as purpose etc. have a phase difference film corresponding to the suitable phase differential of application target, also can be the phase difference film etc. of the optical characteristics such as phase difference film control phase difference of lamination more than 2 kinds.
In addition, above-mentioned ellipsoidal polarizing plate or reflection-type ellipsoidal polarizing plate obtain polaroid or reflection type polarizer and the suitable combination of phase difference film and lamination.Such ellipsoidal polarizing plate etc., by their gradation laminations in the manufacture process of liquid crystal indicator also being made the combination that reaches (reflection-type) polaroid and phase difference film, thereby also can form, but it is as above-mentioned, make the film of the optical thin film of ellipsoidal polarizing plate etc. in advance, excellences such as the stability of quality and lamination operation can improve the manufacturing efficient of liquid crystal indicator etc., and this advantage is arranged.
The effect of vision compensation film is: even from not being the occasion that the direction that tilts vertically but is slightly seen the liquid crystal indicator picture to picture, also will expand the visual angle so that the image of seeing distinctness relatively.As such vision compensation of phase difference sheet, for example comprise the oriented film of phase difference film, liquid crystal polymer etc. and in the transparent base upper support sheet etc. of oriented layer of liquid crystal polymer etc.Common phase difference film uses what its face direction uniaxially had stretched has a birefringent thin polymer film, and for the phase difference film that uses as the vision compensation film, use the face direction stretched two-wayly have birefringent thin polymer film, at the face direction uniaxially biaxially oriented film with birefringent polymkeric substance and tilted alignment film and so on etc. of refractive index of thickness direction that has been stretching in control that thickness direction also stretched.As the tilted alignment film, for example list: on thin polymer film, engage heat-shrinkable film, stretch processing and/or shrink process thin polymer film under the effect of its convergent force that heating brings and film, make the liquid crystal polymer tilted alignment and film etc.The material feedstock polymkeric substance of phase difference film, the polymkeric substance that the polymkeric substance that use illustrates in phase difference film just now is same, can use with prevent based on the angle of visibility of the phase differential that brings by liquid crystal cell change the painted grade that causes and enlarge visual good visual angle etc. be the suitable polymer blend of purpose.
In addition; from realizing visual good considerations such as aspect with great visual angle, can preferably use with the tri acetyl cellulose film support optical compensation phase difference film of the optical anisotropic layer of the tilted alignment layer that comprises the oriented layer of liquid crystal polymer, particularly disc-like liquid crystal polymkeric substance.
Polaroid uses with the inboard position that the polaroid that is fitted with briliancy raising film can be arranged on liquid crystal cells usually.Briliancy improves film and shows such specific character, promptly, it reflects the linear polarization of regulation polarizing axis or the rotatory polarization of prescribed direction by the backlight of liquid crystal indicator etc. or by incidence natural lights such as inboard reflections, and see through other light, therefore, briliancy is improved polaroid that film and polaroid lamination form obtains the light that sees through of regulation polarized condition from the light of light source such as backlight by incident, do not see through simultaneously beyond this regulation polarized condition light and with its reflection.Improved by this briliancy film surface reflection light so that reverse and incides briliancy raising film once more by being arranged at reflection horizon etc. that briliancy improves the film rear side, wherein part or all is as the light of regulation polarized condition and see through, thereby can increase the light that improves film through briliancy, supply with a kind of polarisation of being absorbed by polarizer of being difficult to simultaneously, therefore the light quantity that to be utilized by the demonstration of liquid crystal display image etc. can be increased, thereby briliancy can be improved.That is to say, if do not use briliancy to improve film, then by grade backlight from the inboard of liquid crystal cells the occasion by the polarizer incident light, the light that has with the inconsistent polarization direction of polarizing axis of polarizer is almost all absorbed by polarizer, can not see through polarizer.That is to say according to the difference of used polarizer characteristic and different, have 50% light to be sponged approximately by polarizer, at this moment, but the light quantity that the brilliant image demonstration of feed flow etc. utilize reduce, thereby make the image deepening.And briliancy improves film and does not allow light with the polarization direction that can be absorbed by polarizer incide polarizer but improve film by briliancy it is carried out primary event, then by being arranged on that briliancy improves the reflection horizon etc. of film rear side and inverted, and incide briliancy once more and improve film, these processes are carried out repeatedly, at this moment, only between the two, reflect, the polarization direction of light of counter-rotating become can be by polarizer polarization direction the time polarisation could see through briliancy raising film and supply to polarizer, the image that therefore light of grade backlight can be used for efficiently liquid crystal indicator shows, thereby image is brightened.
Between briliancy raising film and above-mentioned reflection horizon etc., also diffuser plate can be set.Improve the light of the polarized condition of film reflection by briliancy, towards this reflection horizon etc., still, the diffuser plate of setting will spread equably from the light that wherein passes through, and eliminates its polarized condition simultaneously, makes it become non-polarized condition.That is to say, repeat: the light orientating reflex layer of natural light state etc., be reflected by reflection horizon etc., once more by diffuser plate, and incide briliancy once more and improve film.By briliancy improve so be provided with between film and this reflection horizon etc. a kind of have make polarisation revert to the diffuser plate of original natural light, can be when keeping the display frame briliancy, reduce the phenomenon that shows that the drawing luminance nonuniformity is even, thereby even and bright picture can be provided.Can think that by such diffuser plate is set, the multiplicity that initial incident light is reflected increases rightly, and this effect combines with the diffusion function of diffuser plate, thereby can provide evenly and bright display frame.
Improve film as above-mentioned briliancy, can use to show those laminated multi-layer bodies that for example resemble the different film of dielectric multilayer film or refractive index anisotropy and a kind ofly see through the linear polarization of regulation polarizing axis and reflect the film of the characteristic of other light, support the aligned liquid-crystal layer is arranged as the oriented film of cholesteric liquid crystal polymer or on film substrate and the film that forms, show any rotatory polarization of the left-handed or dextrorotation of reflection and see through the suitable films such as film of the characteristic of other light.
Therefore, allow like that to stipulate that at this briliancy of the linear polarization infiltration type of polarizing axis improves in the film, can be directly incident on polaroid by its polarizing axis owing to should see through light, and therefore can suppress to absorb caused loss, thereby can allow light see through efficiently owing to be polarized sheet.On the other hand, briliancy at the rotatory polarization infiltration type resemble the cholesteric improves in the film, light also can be directly incident on polarizer, but consider from the viewpoint that suppresses absorption loss, reenter the mode that is mapped to polaroid after preferably making this rotatory polarization be transformed into linear polarization by polarizer.Should illustrate,, rotatory polarization can be transformed into linear polarization by using 1/4 wavelength plate as polarizer.
In the wide wavelength coverage of visible light wave range etc., has polarizer as 1/4 wavelength plate function, can by for example with the corresponding polarizer that has as 1/4 wavelength plate function of the light light of wavelength 550nm, with the phase separation layer that shows other phase difference characteristics, for example have to wait and obtain as the overlapping mode of the phase separation layer of 1/2 wavelength plate function.Therefore, the polarizer that is disposed between polaroid and the briliancy raising film can comprise by one deck or two-layer above phase separation layer.
In addition, in cholesteric, by the combination of thing layer that reflection wavelength is different and make it become two-layer or stacked structure more than three layers, can obtain a kind of can be at the thing layer of the wide wavelength coverage internal reflection rotatory polarization of visible light wave range, according to this fact, just can obtain the rotatory polarization that in wide wavelength coverage, sees through.
In addition, polaroid also can resemble comprised lamination above-mentioned polarisation divergence type polaroid polaroid and optical layers two-layer or more than three layers.Therefore, also can be the reflection-type ellipsoidal polarizing plate that combines by above-mentioned reflection type polarizer or semi-transmission type polaroid and polarizer or semi-transmission type ellipsoidal polarizing plate etc.
The optical thin film that forms in this optical layers of lamination on the polaroid can form according to the mode of successively each being pressed layer by layer in the manufacture process of liquid crystal indicator etc., but has in the function admirable of aspects such as quality stability and assembling operation and the advantage of efficient that can improve the manufacturing process of liquid crystal indicator etc. by the mode that lamination in advance forms optical thin film.When lamination, can use suitable joint measures such as bonding coat.With above-mentioned polaroid and other optical layers when bonding, the angle that can the optic axis of these thing layers is configured to suit according to desired phase difference characteristics of application target etc.
The following describes the preparation method of antistatic adhering optical film.
At above-mentioned optical thin film 1, utilize metal oxide or metal oxide and bond composition to form antistatic backing 2.Metal oxide preferably uses with the form of dispersion liquid.The solid component concentration of dispersion liquid preferably is adjusted to about 0.1-5 weight % usually.This dispersion liquid is used the rubbing method coating, and dry of rolling method, spin-coating method, pipe face rubbing method, fountain type rubbing method (fountain coating), infusion process, spraying rubbing methods etc. such as contrary roller coat cloth, intaglio plate coating, form antistatic backing.
Antistatic backing thickness is preferably 5-1000nm.Antistatic backing thickness is considered to be decided to be below the 5000nm usually from the aspect that optical characteristics reduces, but when antistatic backing thickness thickening, because the undercapacity of antistatic backing easily causes destruction in antistatic backing, can not get sufficient adaptation sometimes.Antistatic backing thickness is preferably below the 500nm, more preferably below the 400nm, further is preferably below the 300nm.From the angle consideration of guaranteeing adaptation, suppressing to peel off static, more than the preferred 5nm, more preferably more than the 10nm.On the other hand, it is good to peel off electrostatic efficiency when antistatic backing thickness is thick, also is that this effect is following or equal but surpass 300nm.Consider that from such aspect be preferably 5-500nm, more preferably 10-400nm further is preferably 10-300nm.
When forming antistatic backing 2, can implement activation processing to optical thin film 1.Activation processing can adopt the whole bag of tricks, for example can adopt corona treatment, low pressure UV processing, plasma treatment etc.Activation processing is using the occasion of the aqueous solution that contains the water-soluble conducting polymkeric substance effective as antistatic agent, the depression of filming in the time of can suppressing to be coated with this aqueous solution.Activation processing is effective in the occasion that optical thin film 1 is in particular polyolefin-based resins, norbornene resin.
The formation of adhesive phase 3 is undertaken by being laminated on the above-mentioned antistatic backing 2.As the restriction especially of formation method, list the method for on antistatic backing coat binding agent solution and dry method, the release sheet transfer printing by being provided with adhesive phase etc.The thickness of adhesive phase is restriction especially not, but is preferably about 10-40 μ m.
As the constituent material of release sheet, enumerate film of synthetic resin, sheet rubber, paper, cloth, nonwoven fabrics, net, foam piece and the metal forming of paper delivery, tygon, polypropylene, polyethylene terephthalate etc., their the suitable slender lobule body etc. of layered product etc.For the surface of release sheet,, also can implement the lift-off processing of the low connectivity of silicone-treated, chain alkyl processing, fluorine processing etc. as required in order to improve from the fissility of adhesive phase 3.
For each layer of the optical thin film of antistatic adhering optical film of the present invention and adhesive phase etc., also can make mode make it to have ultraviolet absorption ability etc. by the mode handled with the ultraviolet light absorber of for example salicylate based compound or benzo phenol based compound, benzotriazole based compound or acrylic acid cyano group ester based compound, nickel complex salt based compound etc. etc.
Antistatic adhering optical film of the present invention can be preferred for the formation etc. of the various image display devices of liquid crystal indicator etc.The formation of liquid crystal indicator can be carried out according to the past standard.Promptly, liquid crystal indicator is generally by the suitable component parts of assembling liquid crystal cell, antistatic adhering optical film and illuminator as required etc., and group is gone into driving circuit and is waited and form, but in the present invention, except the aspect of using optical thin film of the present invention, do not limit especially, can be according to the past standard.About liquid crystal cell, also can use the liquid crystal cell of any type etc. of for example TN type or STN type, π type etc.
Can be formed on the liquid crystal indicator of configuration antistatic adhering optical film on the one or both sides of liquid crystal or in illuminator, use the suitable liquid crystal indicator etc. of backlight or reflecting plate etc.In the case, optical thin film of the present invention can be arranged on the one or both sides of liquid crystal cells.When the occasion that optical thin film is arranged on both sides, the optical thin film of these both sides can be identical or different.And then, when forming liquid crystal indicator, can configuration one deck on the suitable position or two-layer more than for example diffuser plate, anchor layer, antireflection film, fender, prism array, lens array thin slice, light diffusing sheet, suitable parts such as backlight.
The following describes Organnic electroluminescent device (organic EL display).Optical thin film of the present invention (polaroid etc.) is also applicable to organic EL display.Usually, organic EL display is by lamination of transparent electrode, organic luminous layer, metal electrode form luminophor (luminophor of organic electroluminescent) successively on transparency carrier.Herein, organic luminous layer is the layered product of various organic films, and known for example has: layered product that layered product that the luminescent layer that is made of the fluorescence organic solid of the hole injection layer that contains triphenylamine derivative etc. and anthracene etc. forms or the electron injecting layer that is made of such luminescent layer Yu perylene derivant etc. form or the structure with the various combinations such as layered product that formed by these hole injection layers, luminescent layer and electron injecting layer.
Organic EL display is by coming to organic luminous layer injected hole and electronics to transparency electrode and metal electrode impressed voltage, because the energy that these holes produced when combining with electronics again excites fluorescent material, just send light when the fluorescent material that is excited returns to ground state, organic EL display relies on this principle luminous exactly.The mechanism of combination is identical with general diode again in the so-called way, can expect thus, and electric current and luminous intensity demonstrate with respect to the voltage that adds and follow the strong non-linear of rectification.
In organic EL display, for light that will take place in the organic luminous layer takes out, it is transparent must having an electrode at least, can use transparency electrode that the transparent conductive body by tin indium oxide (ITO) etc. forms as anode usually.On the other hand, in order can easily to inject electronics and to improve luminescence efficiency, using the little material of work function is important as negative electrode, uses the metal electrode of Mg-Ag, Al-Li etc. usually.
In having the organic EL display of this structure, formed organic luminous layer is that a kind of thickness has only the film about 10nm.Therefore, organic luminous layer is also the same with transparency electrode can allow light almost completely pass through.Its result, non-when luminous by the surperficial incident of transparency carrier and see through transparency electrode and organic luminous layer and then the light that reflected by metal electrode, surface one side from transparency carrier penetrates again, therefore, when from visual observation, the display surface of organic EL display looks that to resemble minute surface the same.
In the organic EL display of the luminophor that contains organic electroluminescent, coming the face side of luminous organic luminous layer to have transparency electrode by impressed voltage, simultaneously has metal electrode in the inside of organic luminous layer side, in this organic EL display, can polaroid be set in the face side of transparency electrode, between these transparency electrodes and polaroid, polarizer be set simultaneously.
Polarizer and polaroid have a kind of effect that makes the light generation polarisation that reflects from outside incident and by metal electrode, because a kind of effect of can't see the minute surface of metal electrode from the outside is played in this polarisation effect.Particularly, the minute surface of metal electrode can be covered fully using 1/4 wavelength plate to constitute polarizer and the angle of the polarization direction of polaroid and polarizer being adjusted under the condition of π/4.
That is to say in inciding the exterior light of this organic EL display, to have only the linear polarization composition to pass through from polaroid.And this linear polarization generally will be transformed into elliptical polarized light by polarizer, still, is 1/4 wavelength plate at polarizer particularly, and the angle of the polarization direction of polaroid and polarizer is π/4 o'clock, and this linear polarization just is transformed into rotatory polarization.
This rotatory polarization sees through transparency carrier, transparency electrode, organic film, reflected by metal electrode then, and then see through organic film once more, transparency electrode, transparency carrier, and then be transformed into linear polarization by polarizer.So the polarization direction of this linear polarization and polaroid is perpendicular, therefore can not see through polaroid.Its result can be covered the minute surface of metal electrode fully.
(embodiment)
Specifically describe the present invention below by embodiment, but the present invention is not subjected to the qualification of these embodiment.Should illustrate that part and % in each example all are as benchmark with weight.
(optical thin film)
Used polaroid (day eastern electrician's corporate system, trade name SEG5425DU).
(formation of antistatic backing)
Used tin oxide micro-dispersed liquid (industry in the mountain (strain) system, EPS-6).This dispersion liquid is coated on the one side of above-mentioned polaroid, makes dried thickness reach 200nm, formed antistatic backing in 2 minutes 80 ℃ of dryings.
(formation of adhesive phase)
As base polymer, used to contain to comprise butyl acrylate: acrylic acid: the solution (solid constituent 24%) of the acrylic acid series polymeric compounds of the weight-average molecular weight 1,800,000 of the multipolymer of acrylic acid 2-hydroxy methacrylate=100: 5: 0.1 (weight ratio).In aforesaid propylene acid based polymer solution, with respect to 100 parts of polymer solids compositions, adding is as the glycuronate of isocyanate-based multi-functional compounds's Japanese polyurethane corporate system (コ ロ ネ-ト) 2.5 parts of L and adjuvant (KBM-403, SHIN-ETSU HANTOTAI's silicone corporate system) 0.6 part, adjust the solvent (ethyl acetate) of viscosity, prepared binder solution (solid constituent 11%).Adopt contrary roller rubbing method to be coated on mould release film (polyethylene terephthalate base material: ダ イ ヤ ホ イ Le MRF38 this binder solution, Mitsubishi Chemical's polyester) on, and after making dried thickness reach 25 μ m, give mould release film more thereon, use the heated air circulation type oven drying, form adhesive phase.
(making of antistatic adhering optical film)
On the antistatic backing that is formed at above-mentioned static electricity resistance polaroid surface, fit and formed the mould release film of adhesive phase, made antistatic adhering type polaroid.
In embodiment 1, when forming antistatic backing, the micro-dispersed liquid that replaces tin oxide, used the micro-dispersed liquid of tin oxide and the mixed solution of polyurethane series cement (industry in the mountain (strain) system, EPS-6H001), in addition, adopt method similarly to Example 1 to make antistatic adhering type polaroid.The ratio of the micro-dispersed liquid of tin oxide and polyurethane series bonding agent (weight ratio: solid constituent) be the former: the latter=1: 1.The solid component concentration of dispersion liquid is 1%.
In embodiment 2, when forming antistatic backing, replace the micro-dispersed liquid of tin oxide and the mixed solution of polyurethane series bonding agent, the dispersion liquid of tin oxide of antimony dopant and the mixed solution of polyurethane series bond have been used, in addition, adopt method similarly to Example 2 to make antistatic adhering type polaroid.
Embodiment 4
In embodiment 1, when forming antistatic backing, replace the micro-dispersed liquid of tin oxide, used the micro-dispersed liquid of the tin oxide of doped indium, in addition, adopt method similarly to Example 1 to make antistatic adhering type polaroid.
Embodiment 5
In embodiment 1, when forming antistatic backing, replace the micro-dispersed liquid of tin oxide, used the micro-dispersed liquid of tin oxide of doped indium and the mixed solution of polyurethane series bond, in addition, adopt method similarly to Example 1 to make antistatic adhering type polaroid.The ratio of the micro-dispersed liquid of the tin oxide of doped indium and polyurethane series bond (weight ratio: solid constituent) be the former: the latter=1: 1.The solid component concentration of mixed solution is 1%.
Comparative example 1
In embodiment 1, antistatic backing is not set, in addition, adopt method similarly to Example 1 to make the adhesion type polaroid.
About the antistatic adhering optical film that in the foregoing description and comparative example, obtains etc., carried out following evaluation.Table 1 is expressed evaluation result.
(bonding agent lacks to fall)
The antistatic adhering optical film of above-mentioned making is cut into the size of 25mm * 150mm with Thomson sword stamping, cutting tip is contacted 20 times with level and smooth SUS plate.Through the end of Visual Confirmation each antistatic adhering optical film, use following benchmark evaluation thereafter.In addition, show that bonding agent lacks the area that falls.Table 1 is expressed the result.
Zero: do not have bonding agent to lack to fall
△: do not have the above bonding agent of 0.3mm to lack to fall
*: there is the above bonding agent of 0.3mm to lack to fall
(adhesive residue)
The antistatic adhering optical film of made is cut into the size of 100mm * 100mm, stick on the liquid crystal display.To shield after placing 48 hours under 40 ℃ * 92% the humidified condition, peel off antistatic adhering optical film from liquid crystal display, use following benchmark evaluation with hand.
Zero: do not have adhesive residue.
*: adhesive residue is on screen.
(adaptation)
With the antistatic adhering optical film of made cut into 25mm wide * 50mm is long.Fit make its bonding agent aspect with at the thick pet film of 50 μ m surface evaporation the evaporation face of evaporated film of indium-tin oxide contact placement more than 20 minutes under 23 ℃/60%RH environment then.Thereafter, peel off the end of pet film with hand, confirm that adhesive attachment is in the pet film rear flank, use cupping machine (Shimadzu Seisakusho Ltd.'s system, オ-ト グ ラ Off AG-1), peel off at 180o, under the draw speed 300mm/min under room temperature atmosphere (25 ℃) measured the adaptation (N/25mm) of antistatic backing and adhesive phase.Such adaptation (N/25mm) is preferably more than the 15N/25mm, more preferably more than the 18N/25mm.
(anti-static effect)
The antistatic adhering optical film of made is cut into the size of 100mm * 100mm, stick on the liquid crystal display.This screen is placed on has 10000cd/m
2Briliancy backlight on, adhesive surface protective film (base material: the polyethylene terephthalate of thickness 38 μ m, adhesive phase: the acrylic adhesive of thickness 20 μ m), this protective film is peeled off with the speed of 7m/min in the 180o direction.(big electronics corporation system MCPD-3000) is measured the bad release time (second) of demonstration that the orientation disorder by liquid crystal causes to use many photometries of moment detecting device.In addition, this screen after placing 500 hours under 50 ℃ the environment, is used with above-mentioned same method and measured release time (second).
(sheet resistance value)
Use surface resistance analyzer (Mitsubishi Chemical's (strain) system, Hiresta MCP-HT450) under impressed voltage 500V, to measure the surface resistivity of antistatic backing (Ω/).
Table 1
| Bonding agent lacks to fall | Adhesive residue | Adaptation (N/25mm) | Show bad release time (second) | Surface resistivity (Ω/) | ||
| Initial stage | ???50℃× ???????500h | |||||
| | ??○ | ????○ | ????15.0 | ????1-2 | ????1-2 | ?5.5×10 7 |
| | ??○ | ????○ | ????18.3 | ????1-2 | ????1-2 | ?5.2×10 7 |
| | ??○ | ????○ | ????16.5 | ????1-2 | ????1-2 | ?2.3×10 7 |
| Embodiment 4 | ??○ | ????○ | ????19.0 | ????＜1 | ????＜1 | ?1.5×10 9 |
| Embodiment 5 | ??○ | ????○ | ????19.5 | ????＜1 | ????＜1 | ?3.2×10 9 |
| Comparative example 1 | ??× | ????× | ????8.5 | More than 1800 | More than 1800 | ?1.0× ?10 14 |
Claims (8)
1. antistatic adhering optical film, it has antistatic backing, adhesive phase in the one side at least of optical thin film lamination successively, and wherein this antistatic backing contains metal oxide.
2. antistatic adhering optical film according to claim 1, wherein, this metal oxide contains the Sn system compound.
3. antistatic adhering optical film according to claim 2, wherein, this Sn system compound is the tin oxide of doped indium.
4. antistatic adhering optical film according to claim 1, wherein, this antistatic backing also further contains the bond composition.
5. antistatic adhering optical film according to claim 4, wherein, this bond composition is at least a resin that is selected from the group that is formed by polyurethane series resin, polyester based resin and acrylic resin.
6. antistatic adhering optical film according to claim 1, this adhesive phase comprises acrylic adhesive.
7. according to the manufacture method of wantonly 1 described antistatic adhering optical film of claim 1-6, comprising: coating has disperseed the operation that this dispersion liquid of operation, the drying coated cloth of the dispersion liquid of metal oxide forms the operation of antistatic backing and form adhesive phase on this antistatic backing on the one side at least of optical thin film.
8. image display device, it comprises wantonly 1 described antistatic adhering optical film of claim 1-6.
Applications Claiming Priority (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2004051910 | 2004-02-26 | ||
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| JP51910/2004 | 2004-02-26 | ||
| JP2004306975A JP4832748B2 (en) | 2004-02-26 | 2004-10-21 | Antistatic adhesive optical film, method for producing the same, and image display device |
| JP306975/04 | 2004-10-21 | ||
| JP306975/2004 | 2004-10-21 |
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| JP (1) | JP4832748B2 (en) |
| KR (1) | KR20060042226A (en) |
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| CN102341978A (en) * | 2009-03-05 | 2012-02-01 | 昭和电工株式会社 | Composition for filling discharge gap and electrostatic discharge protection member |
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- 2004-10-21 JP JP2004306975A patent/JP4832748B2/en active Active
-
2005
- 2005-02-23 TW TW094105333A patent/TWI369516B/en active
- 2005-02-25 KR KR1020050015766A patent/KR20060042226A/en active Search and Examination
- 2005-02-28 CN CN200510052186A patent/CN100592110C/en active Active
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Also Published As
| Publication number | Publication date |
|---|---|
| TWI369516B (en) | 2012-08-01 |
| TW200537138A (en) | 2005-11-16 |
| JP2005271573A (en) | 2005-10-06 |
| JP4832748B2 (en) | 2011-12-07 |
| CN100592110C (en) | 2010-02-24 |
| KR20060042226A (en) | 2006-05-12 |
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