CN100337134C - Method for producing polaroid and liquid crystal display with poloroid - Google Patents
Method for producing polaroid and liquid crystal display with poloroid Download PDFInfo
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- CN100337134C CN100337134C CNB011440600A CN01144060A CN100337134C CN 100337134 C CN100337134 C CN 100337134C CN B011440600 A CNB011440600 A CN B011440600A CN 01144060 A CN01144060 A CN 01144060A CN 100337134 C CN100337134 C CN 100337134C
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Abstract
A topic of the present invention provides a polaroid with the characteristics of high transmissivity and high polarized light intensity and a liquid crystal display with the polaroid obtained by the method. In a method for producing polaroids, a polyvinyl alcohol (PVA) membrane is dyed through dye liquor containing iodine with a dichromatic property, and the crosslink treatment of the polyvinyl alcohol (PVA) membrane is carried out through a crosslink agent. In the steps, at least one pair of rollers are used for extending the polyvinyl alcohol (PVA) membrane, bathes added with the crosslink agent are stated as more than two kinds, and the extension of the polyvinyl alcohol (PVA) membrane after a second bath is carried out in a mode that the extension magnification is larger than the extension magnification of a first bath according to the extension magnification of the first bath, which is in a range of 1 to 4 times.
Description
Technical field under the present invention
The present invention relates to be used for LCD (below abbreviate " LCD " as) polaroid manufacture method and have LCD with the polaroid of this method acquisition.More particularly, the present invention relates to have high-transmission rate and high polarisation luminosity characteristic polaroid manufacture method and have the LCD of this polaroid.
Prior art
LCD is used for personal computer etc., and in recent years, its consumption sharply increases.LCD's is of many uses, and it also is used for monitor in recent years.
At the polaroid of the display that is used for LCD etc., if transmissivity is lower, then polarisation luminosity uprises, and the light quantity of transmission reduces, and shows deepening.Otherwise,, then have polarisation luminosity and reduce the problem of degradation in contrast if increase transmissivity.
In No. 2512408 patent documentation of JP, the 1st of crosslinking Treatment is bathed and the regulation of the 2nd extension ratio of bathing about carrying out, and has proposed to make the 1st extension ratio of bathing, greater than the method for the 2nd extension ratio of bathing.
But, in said method, be difficult to obtain to have high-transmission rate equally, and the polaroid of the characteristic of high polarisation luminosity.
The problem that the present invention will solve
The objective of the invention is to provides a kind of high-transmission rate that has in order to solve above-mentioned existing problem, and the polaroid of the characteristic of high polarisation luminosity, with a kind of LCD with the polaroid that obtains by this method.
Be used to solve the scheme of problem
To achieve these goals, the manufacture method of polaroid of the present invention relates to following method, in the method, by comprising the dyeing liquor of iodine with dichromatic character, polyvinyl alcohol (PVA) (PVA) film is dyeed, by crosslinking chemical it is carried out crosslinking Treatment, and in above-mentioned steps, at least adopt pair of rolls, it is extended processing, the bath that it is characterized in that putting into above-mentioned crosslinking chemical is more than 2 kinds, and in 1～4 times scope, the 2nd bathes later extension ratio extends processing greater than the mode of the above-mentioned the 1st extension ratio of bathing according to the 1st extension ratio of bathing.
In said method, preferably put into the 1st temperature of bathing of crosslinking chemical relatively, the 2nd temperature of bathing at least 1 later bath exceeds more than 5 ℃ than the 1st crosslinked fluid temperature of bathing.
In said method, preferably put into temperature that the 1st of crosslinking chemical bathes 10～90 ℃ scope.
In said method, the extension ratio of PVA film that is preferably in the dye bath of putting into dyeing liquor is less than 5 times.
In said method, the temperature of dye bath of preferably putting into dyeing liquor is 15～50 ℃ scope.
In addition,, fit, form reflection type polarizer or Transflective template polaroid with the polaroid of making according to any one the described method in the claim 1～5 preferably with reflecting plate or Transflective plate.
In addition,, fit, form ellipse or circular polarizing disk with the polaroid of making according to any one the described method in the claim 1～5 preferably with polarizer or λ plate.
Also have,, fit, form polaroid with the polaroid of making according to any one the described method in the claim 1～5 preferably with compensation film for angular field of view.
Also have, the most handy bonding agent or bonding agent are fitted high briliancy film with the polaroid of making according to any one the described method in the claim 1～5, form polaroid.
Have, LCD of the present invention is characterised in that at least one side at liquid crystal cell again, has the polaroid of making according to the described method of claim 1～9.
Form of implementation of the present invention
The manufacture method of polarizing coating generally can be divided into following 3 steps, is promptly putting into the iodine with dichromatic characteristic, or in the liquid of dyestuff, " staining procedure " that the PVA film is dyeed; Put into boric acid, carrying out " cross-linking step " of crosslinking Treatment in the bath of the crosslinking chemical of the PVA of borax etc.; Carry out " the extension step " of the extension of PVA.In addition, " extension step " is most usually side by side carries out at " staining procedure " and " cross-linking step ", but step that also can be independent is carried out.In addition, staining procedure and cross-linking step also can side by side be carried out.Polarizing coating is made like this, promptly after above-mentioned 3 steps, carries out drying, will constitute triacetyl cellulose (TAC) film of diaphragm, or the film of polyethylene terephthalate (PET) film etc. fits in a side, or both sides.
Find the inventor, in above-mentioned dyeing, crosslinked, each step of extending, the bath of putting into crosslinking chemical more than 2 is set, according to the 1st extension ratio of bathing in 1～4 times scope, after this 2nd of the crosslinking chemical of putting into is bathed later extension ratio, mode greater than the 1st extension ratio of bathing of putting into crosslinking chemical is extended, and obtains to have high-transmission rate, the polaroid of the characteristic of high polarisation luminosity thus.The quantity of the liquid of putting into crosslinking chemical such as, be 3 occasion, the 2nd to bathe later multiplying power be the multiplying power that bathe the 2nd multiplying power of bathing * 3rd.
In the manner described above, the invention is characterized in that the 2nd bathes later multiplying power greater than the 1st extension ratio of bathing.
In addition, though in comparative example 2, provide, but, know, the characteristic of the polaroid of making less than the 2nd condition of bathing according to the extension ratio of the 1st crosslinked fluid of the present invention of bathing is better than the feature of the polaroid of making greater than the condition of the 2nd corresponding multiplying power of bathing according to the extension ratio of the 1st crosslinked fluid of bathing.
In dye bath, except dyestuff or iodine, also comprise the iodide of potassium iodide etc., or the crosslinking chemical of boric acid etc.In order to prevent the uneven generation of dyeing, preferably the temperature of dye bath is in 15～50 ℃ scope.When the temperature of dye bath during less than 15 ℃, then the swelling of PVA is insufficient easily, and it is inhomogeneous to produce swelling in face, causes dyeing inhomogeneous easily.In addition, if said temperature greater than 50 ℃, then the swelling of PVA is too high, it is inhomogeneous to produce swelling in face, or part PVA dissolving, it is inhomogeneous to produce dyeing thus, so preferably do not adopt this mode.
The extension ratio of the PVA film in the dye bath is not subjected to special qualification, if but extension ratio greater than 5 times, it is good then to be difficult to obtain optical characteristics, i.e. transmissivity and the higher goods of polarisation luminosity, above-mentioned thus extension ratio particularly is preferably in 1.5～5 times preferably less than 5 times.In addition, in the occasion of above-mentioned extension ratio, then be difficult to carry out the walking of stable film less than 1.5 times.
In staining procedure, if when stirring, the solution in the dye bath is dyeed, inhomogeneous along the dyeing of the striated of bearing of trend not then, thus, also can improve show inhomogeneous.In addition, stirring method is not the mode of regulation yet, and can adopt arbitrary method.But if current are directly contacted with the PVA film, then the track of current is inhomogeneous and residual as what dye easily, so best current directly do not contact with film.In addition, obviously, the temperature in the bath preferably also is uniform.In addition, the film in preferably bathing carries out extension to a certain degree according to unflagging mode, and lax part is easy to generate the inhomogeneous of dyeing.So, when dyeing, also can when not producing fold, dye by along strain laterally more weakly.In addition, along roller, dye, thereby do not produce fold.
In addition, the roll line of the film in the bath is not stipulated, preferably adopts the roll line that film and current are directly contacted.
Also have, according to manufacture method of the present invention, 2 baths of putting into crosslinking chemical are set, according to the 1st extension ratio of bathing in 1～4 times scope, the later extension ratio of the 2nd bath is higher than the mode of the 1st extension ratio of bathing and extends, if but the 1st extension ratio of bathing greater than 4 times, film is disrumpent feelings easily.The particularly best the 1st extension ratio of bathing is in 1.2～3.5 times scope.
In said method, preferably put into the 1st temperature of bathing of crosslinking chemical relatively, the 2nd bathes at least 1 later bath temperature exceeds more than 5 ℃ than the 1st crosslinked fluid temperature of bathing, corresponding bath temperature is not subjected to special qualification, but the best the 1st temperature of bathing can be in 10～90 ℃ scope, particularly preferably the 1st temperature of bathing in 15～60 ℃ scope.When the 1st temperature of bathing during less than 10 ℃, crosslinked insufficient, if the above-mentioned the 1st temperature of bathing greater than 90 ℃, then film fusing and disrumpent feelings easily.
As polariscope (polarizing coating), can adopt following suitable form, wherein work as by method of the present invention, to by such as polyvinyl alcohol (PVA) or part formolation polyvinyl alcohol (PVA) etc., the film that the vinyl alcohol system polymer that is fit to for preparing according to existing mode forms, the dyeing of carrying out the bitintability material that formed by iodine or bitintability dyestuff etc. is handled or is extended and handle or the processing of crosslinking Treatment etc., when injecting natural light, and the transmissive rectilinearly polarized light.Particularly preferably adopt light transmission or the good type of polarisation luminosity.
Be arranged at the protective film material of transparent protective layer of the one or both sides of polariscope (polarizing coating) as formation, can adopt suitable hyaline membrane.As an example of its polymkeric substance, generally adopt the cellulose-based resin of triacetyl cellulose etc., but be not limited thereto situation.
From aspects such as polarization characteristic or permanance, the transparent protective film that can especially preferably use is for carrying out the tri acetyl cellulose membrane that saponification is handled by alkali to the surface.In addition,, the occasion of transparent protective film is set, also can adopts within it the outer transparent protective film that forms by different polymkeric substance etc. in the both sides of polarizing coating.
Only otherwise damage purpose of the present invention, the transparent protective film that is used for diaphragm also can be and has carried out that hard conating (hard coat) is handled or reflection prevents to handle, to prevent bonding or to prevent to spread and anti-dazzle etc. is the film of the processing etc. of purpose.It is the processing that purpose is carried out that hard conating (hard coat) is treated to damage that prevents the polaroid surface etc.; this processing can be by on the surface of transparent protective film; the formation such as mode of additional following hardened surface film, this hardened surface film refer to such as the uv-hardening resin that is fit to of silicone-based etc., good hardened surface films such as hardness or sliding.
Reflection prevents the outer reflection of light that is treated to the polaroid surface from preventing to be the processing that purpose is carried out, and it can be realized by the formation of carrying out according to the past mode such as antireflection film.In addition; prevent bonding for being purpose with bonding the preventing of adjoining course; anti-dazzle is handled and to be referred to for preventing the surface at polaroid, and external light reflection hinders the processing that the visual situation etc. of polaroid transmitted light is carried out for purpose; this processing can form by following manner; this mode is: by such as, sandblast mode, the suitable mode of the uneven surface mode of embossing processing mode etc. or the fit system of transparent fine particle etc.; on the surface of transparent protective film, provide trickle concaveconvex structure.
Above-mentioned transparent fine particle exemplified such as, silica or aluminium oxide, titania, tin oxide or indium oxide, cadmium oxide or the antimony oxide etc. of mean grain size in the scope of 0.5～20 μ m, can adopt also that to have the inorganic of electric conductivity be fine particle, in addition, also can adopt the organic system fine particle that forms by crosslinked or uncrosslinked granular thing of polymkeric substance etc.The consumption of transparent fine particle is generally: every transparent resin 100 weight portions, and in the scope of 2～70 weight portions, particularly in the scope of 5～50 weight portions.
The anti-dazzle photosphere of transparent fine particle proportioning can be used as protective clear layer itself, or as lip-deep overlay of protective clear layer etc.Anti-dazzle photosphere also can be and is used as simultaneously the diffusion of polaroid transmitted light, the visual angle is enlarged the diffusion layer (viewing angle compensation function etc.) of usefulness.In addition, above-mentioned antireflection layer or bonding layer, diffusion layer or the adhesive linkage etc. of preventing also can be used as the optical layers that is formed by the layer that is provided with these layers, and it is the layer that is independent of protective clear layer.
In the present invention; polariscope (polarizing coating) and be not subjected to special qualification as the bonding processing between the transparent protective film of diaphragm; its can by such as; the bonding agent that forms by vinyl alcohol system polymer; or form by the water-soluble cross-linker of the vinyl alcohol system polymer of boric acid or borax, valeral (glutaric aldehyde), melamine, oxalic acid etc., be at least crosslinking chemical etc. and carry out.The coating drying layer that above-mentioned adhesive linkage can be used as aqueous solution forms, but when the modulation of this aqueous solution, as required, also can with other adjuvant, the catalyzer of acid etc. cooperates.
Polaroid of the present invention can be when practical application, as the optics stacked with other optical layers.This optical layers is not special the qualification; and can adopt such as; reflecting plate; the Transflective plate; polarizer (also comprises 1/2 wavelength plate; the λ plate of 1/4 wavelength plate etc.); compensation film for angular field of view or brightness raising film etc.; the formation usefulness of LCD etc.; the optical layers that is fit to more than 1 layer or 2 layers; the particularly preferably above-mentioned polaroid that is formed by polariscope and protective seam of the present invention adopts ellipse or the circular polarizing disk that also is stacked with polarizer; the above-mentioned polaroid that is formed by polariscope and protective seam of the present invention adopts the polaroid that also is stacked with compensation film for angular field of view, or the above-mentioned polaroid that is formed by polariscope and protective seam of the present invention adopts the polaroid that also is stacked with brightness raising film.
When above-mentioned reflecting plate is described, reflecting plate is arranged on the polaroid, it is used to form reflection type polarizer, this reflection type polarizer is arranged at the inboard of liquid crystal cell usually, it can form the incident light from visual side (demonstration side) is reflected, thereby the LCD that realize to show etc., its inside with the light source that can omit bias light etc. is provided with, and is easy to reduce the advantage of the thickness of LCD.
The formation of reflection type polarizer can be as required, and with by above-mentioned transparent protective film etc., on a face of polaroid, the suitable mode that the mode etc. in the reflection horizon that is formed by metal etc. is set is carried out.As its concrete example, for example as required, on a face that fills up the transparent protective film that (mat) handle, paper tinsel or vapor-deposited film that the reflective metal by aluminium etc. forms are set, the formation reflection horizon.
In addition, also can exemplify following reflection type polarizer etc., in this polaroid, comprise fine particle, form on the above-mentioned transparent protective film of surface detail micro concavo-convex structure, have the reflection horizon of this trickle concaveconvex structure of reflection.The reflection horizon of surface detail micro concavo-convex structure is by diffuse reflection, with the incident light diffusion, prevent directive property or glitter bright-coloured, have the uneven advantage that can suppress light and shade etc.The reflection transparent protective film the surface detail micro concavo-convex structure trickle concaveconvex structure the reflection horizon formation can by such as; the evaporation mode of vacuum evaporation mode, ion plating mode, sputter mode etc.; or the mode that is fit to of plating mode etc., undertaken by the method that metal directly is set on the surface of transparent protective film etc.
In addition, reflecting plate also can be used as following reflector plate etc., and in the mode that replaces directly being provided with on the transparent protective film of above-mentioned polaroid, in this reflector plate, the film that is fit to that forms according to this transparent protective film mode is provided with the reflection horizon.Reflection horizon in the reflecting plate is formed by metal usually; from preventing the reduction of the reflectivity that oxidation causes; the aspect of the long-term maintenance of initial reflectance, or avoid aspect such as being provided with separately of protective seam preferably adopts the type of service of the state that its reflecting surface covers by film or polaroid etc.
In addition, the Semitransmissive polaroid can obtain by forming following reflection horizon, and this reflection horizon refers in the foregoing description, by the reflection horizon, and reflected light, and the reflection horizon of the Semitransmissive of the half-mirror of transmitted light etc.This Semitransmissive polaroid is arranged at the inboard of liquid crystal cell usually, be to use in the bright atmosphere occasion of LCD etc., reflection is from the incident light of visual side (demonstration side), displayed image, in darker atmosphere, can form the LCD of following type, in this display, employing be arranged at the Semitransmissive polaroid rear side bias light etc. in establish light source, displayed image.That is, the Semitransmissive polaroid can be saved the energy that the light source of bias light etc. uses under bright atmosphere, same under darker atmosphere, and the formation of the LCD of spendable type etc. is useful for establishing light source in adopting.
Below to by above-mentioned of the present invention, on the polaroid that forms by polariscope and protective seam, the ellipse of stacked polarizer also, or circular polarizing disk is described.
With rectilinearly polarized light, change ellipse into, or circularly polarized light, or with ellipse, or circularly polarized light changes rectilinearly polarized light into, or changes the occasion of the direction of polarized light of rectilinearly polarized light, adopts polarizer etc., particularly conduct is with rectilinearly polarized light, change ellipse into, or circularly polarized light, or with ellipse, or circularly polarized light changes the polarizer of rectilinearly polarized light into, adopts so-called 1/4 wavelength plate (being also referred to as " λ/4 plates ").1/2 wavelength plate (being also referred to as " λ/4 plates ") is generally used for changing the occasion of the direction of polarized light of rectilinearly polarized light.
Ellipsoidal polarizing plate is used for following occasion etc. effectively, and in this occasion, painted (blue or yellow) that the birefringence because of the liquid crystal layer of STN type LCD is produced compensates, and forming does not have above-mentioned painted white and black displays.In addition, preferably adopt the mode of control 3 dimension refractive indexes, what can produce when watching the picture of LCD from vergence direction like this is paintedly also compensated (preventing).It is the occasion etc. of tone of image of the reflection LCD of colour demonstration that circular polarizing disk is used for adjusting such as, image effectively, in addition, also has the function of reflecting of preventing.
Instantiation as above-mentioned polarizer, exemplify following type etc., wherein prop up and honour by polycarbonate by film, polyvinyl alcohol (PVA), polystyrene or polymethylmethacrylate, polypropylene or other polyolefin, polyarylate or polyamide are such, the film that the polymkeric substance that is fit to forms extends the birefringence film of handling and forming, or the oriented film of liquid crystal polymer, the oriented layer of liquid crystal polymer.In addition,, exemplify as the inclined orientation film, such as, heat-shrinkable film and polymer film is bonding, under the effect of the convergent force that heating produces, polymer film extended handle or/and the type of shrink process, or make the type of liquid crystal polymer inclined orientation.
Below following polaroid is described, in this polaroid, on the above-mentioned polaroid that forms by polariscope and protective seam of the present invention, also stacked compensation film for angular field of view.
Even compensation film for angular field of view is used for according to not vertical with picture, and watch along the direction that tilts slightly under the situation of picture of LCD, see the mode of image enlarging the visual angle still more bright-colouredly.
As such compensation film for angular field of view, adopt on tri acetyl cellulose membrane etc. the type of coating collar plate shape (デ イ ス コ テ イ Star Network) liquid crystal, or polarizer.Common polarizer adopts to have along the birefringent polymer film of its face direction according to uniaxial extension, relative therewith, polarizer employing as compensation film for angular field of view has the birefringent polymer film that extends according to twin shaft along the face direction, or the such two-way stretched PTFE film of inclined orientation polymer film etc., in this inclined orientation polymer film, to along the face direction according to uniaxial extension, the refractive index of the thickness direction that also extends along thickness direction is controlled in addition.As above-mentioned inclined orientation film, as aforesaid, exemplify such as, bonding heat-shrinkable film on polymer film, under the effect of the convergent force that heating causes, polymer film extended handle or/and the type of shrink process, or make the type etc. of liquid crystal polymer inclined orientation.The raw polymer employing of polarizer and the polymer phase polymkeric substance together described in the polarizer in front.
The polaroid of applying brightness raising film uses according to the mode of the inboard that is arranged at liquid crystal cell usually on the above-mentioned polaroid that is formed by polariscope and protective seam of the present invention.Above-mentioned brightness improves film and is presented on by from the bias light of LCD etc. or inboard reflection etc.; when injecting natural light; with the rectilinearly polarized light of regulation polarizing axis or the circularly polarized light reflection of prescribed direction; and other light is realized the characteristic of transmission; brightness improves film; and the polaroid that form stacked with the polaroid that is formed by above-mentioned polaroid and protective seam will be injected from the light of the light source of bias light etc.; obtain the transmitted light of the polarized light state of regulation; and not with the transmittance beyond the afore mentioned rules polarized light state, and with its reflection.Reflection horizon by being arranged at rear side more etc. and will improve the light counter-rotating of face reflection by above-mentioned brightness, it is injected brightness once more improve film, make its part or all light as the regulation polarized light state, realize transmission, make from brightness and improve the light quantity increase that film is realized transmission, and supply with and to be difficult to the polarized light that absorbs for polariscope, make to can be used for the light quantity that the liquid crystal image shows etc. and increase, brightness is increased.That is, do not adopting brightness to improve film, and by bias light etc., from the inboard of liquid crystal cell, by polariscope, injecting the occasion of light, the major part that has with the light of the inconsistent direction of polarized light of polariscopic polarizing axis is that polariscope absorbs, not from the polariscope transmission.That is, though the difference with the polariscopic characteristic that is adopted also, the light with 50% is that polariscope absorbs, and can be used for the light quantity that the liquid crystal image shows etc. and reduces visual deepening.Brightness raising film will not have the light that is absorbed in the such direction of polarized light of polariscope and inject polariscope, and carry out following process repeatedly, promptly in case improve film with this light reflection by brightness, then reverse in this light reflection horizon by rear side more is set etc., this light is injected brightness once more improve film, the brightness polaroid makes between realize reflection, make the polarisation of light light direction of counter-rotating improve film for seeing through brightness by the polarized light of polariscopic direction of polarized light, it is supplied with polariscope, thus, the light of bias light etc. can be used for effectively the demonstration of the image of LCD, can make picture bright.
Improve film as above-mentioned brightness, can adopt such as, the multilayer stack of the film that the multilayer film of dielectric or refractive index anisotropy are different is such, the rectilinearly polarized light that presents transmission regulation polarizing axis, with other the type (" D-BEF " that 3M company produces etc.) of characteristic of light reflection, with cholesteric, particularly the oriented film of cholesteric liquid crystal polymer or its oriented liquid crystal layer are supported on type (" PCF350 " that eastern electrician of day company produces on the film base material, " Transmax " that Merck company produces) such, present left-handed, any one circularly polarized light reflection in the dextrorotation, and the film that is fit to of the type of the characteristic of other light realization transmission etc.
Therefore, above-mentioned, the brightness of the type of the rectilinearly polarized light of transmission regulation polarizing axis improves in the film, mode according to the polarizing axis alignment, same as before this transmitted light is injected polaroid, on one side can suppress the absorption loss of polaroid thus, Yi Bian transmitted light effectively.Resemble the cholesteric, the brightness of the type of transmission circularly polarized light improves in the film, also above-mentioned illumination former state can be injected polariscope, but from suppressing the aspect of absorption loss, preferably pass through polarizer, this transmission circularly polarized light is carried out rectilinearly polarized light handle, make it inject polaroid.At will say,, adopt 1/4 wavelength plate, thus, can change circularly polarized light into rectilinearly polarized light as polarizer.
The wavelength coverage of the broad in the visible region etc. can be by acquisitions such as following manners as the polarizer of 1/4 wavelength plate, this mode is: will such as, relative wavelength is the monochromatic light of light of 550nm etc., phase separation layer as 1/4 wavelength plate, with the phase separation layer of the phase difference characteristics that presents other, stacked such as phase separation layer as 1/2 wavelength plate.Therefore, the polarizer that is arranged between polaroid and the brightness raising film is the plate that is formed by the phase separation layer more than 1 layer or 2 layers.
In addition, equally for cholesteric, form the combination of the different type of reflection wavelength, form the stacked structure that is provided with more than 2 layers or 3 layers, thus, can obtain in the broad wavelength coverage of visible region etc. the type of reflection circle polarized light, according to this situation, can obtain the transmission circularly polarized light of the wavelength coverage of broad.
In addition, polaroid of the present invention also can be formed by following polaroid, and in this polaroid, as above-mentioned polarized light divergence type polaroid, with polaroid and 2 layers, or the optical layers more than 3 layers is stacked.Therefore, also can be above-mentioned reflection type polarizer or Semitransmissive polaroid and polarizer combination, reflection-type ellipsoidal polarizing plate or Semitransmissive ellipsoidal polarizing plate etc.The optics that is stacked with the optical layers more than 2 layers or 3 layers is for can be in the manufacture process of LCD etc., according to distinguishing the type that stacked mode forms successively, but it is stacked in advance, the parts that form optics have following advantage, be that the stability of quality or assembling work etc. are good, the manufacturing efficient of LCD etc. is improved.In addition, in lamination, can adopt the suitable bonding agency of adhesive linkage etc.
In polaroid of the present invention or optics, the adhesive linkage of using with other adhering components of liquid crystal cell etc. can be set also.This adhesive linkage can be by acrylic acid series etc., and the bonding agent that is fit to that forms according to the past mode forms.Particularly, the foamed phenomenon that causes from moisture absorption or peel off the reduction of the optical characteristics that the preventing of phenomenon, thermal expansion difference etc. cause or the bending of liquid crystal cell prevent, high-quality, the aspect of the formability of the LCD that permanance is good etc., preferably adopt hydroscopicity lower, the adhesive linkage of excellent heat resistance.In addition, also can form and to comprise fine particle, present the adhesive linkage of light diffusing etc.Adhesive linkage also can be as required, is arranged on the necessary face, such as, if mention the protective seam of the polaroid that forms by polariscope and protective seam of the present invention, then can on the one or both sides of protective seam, adhesive linkage be set as required.
The occasion of exposing on the surface at the adhesive linkage that is arranged on polaroid or the optics, with this adhesive linkage for during before the practical application, preferably by separator, form to face and establish covering part, so that prevent to pollute etc.This separator can be by formation such as following manners, and this mode is: on the thin slice body that is fit to according to preparations such as above-mentioned transparent protective films, as required, the peel ply of the remover that is fit to of silicone-based or chain alkyl system, fluorine system or molybdenum sulfide etc. is set.
Also have; each layer that forms the polarizing coating of above-mentioned polaroid or optics or transparent protective film, optical layers or adhesive linkage etc. also can be by such as; the mode that is fit to of the mode that the ultraviolet light absorber of salicylate based compound or Benzophenone based compound, benzotriazole based compound or cyanoacrylate based compound, nickel complex salt based compound etc. is handled etc. has the type of UVA energy etc.
Best polaroid of the present invention can be used for the occasions such as shaping of the various devices of LCD etc.LCD can be used as following type and is shaped, in the type, have the transmission-type or the reflection-type that form according to polaroid of the present invention is arranged at the one or both sides mode of liquid crystal cell, or a Transflective dual-purpose type etc., meet the suitable structure of existing mode.Therefore, the liquid crystal cell that forms LCD is arbitrarily, such as, can adopt with the film transistor type is the liquid crystal cell of the active matrix drive-type of representative, is the liquid crystal cell of suitable type of liquid crystal cell etc. of the pure matrix drive type of representative with twisted nematic matrix type or STN Super TN type.
In addition, be that the both sides of liquid crystal cell are provided with the occasion of polaroid or optics, they were both identical, and were also different.In addition, when forming LCD, such as, can the parts that be fit to of prism array layer or lens array layer, light diffusing sheet or background light source (back light) etc. be set in the mode more than 1 layer or 2 layers in the position that is fit to.
Embodiment
Below by following embodiment, the present invention is carried out more concrete description.
(comparative example 1)
Adopt the system PVA (9X75R) of Kuraray company (Network ラ レ), by roller it is extended and handle.In the 1st bathes (35 ℃ of the aqueous solution of iodine, KI), after extending to the overall elongation multiplying power and being 3 times, in the 2nd bathes (53 ℃ of boric acid, KI aqueous solution), be that 6.0 times mode is extended with total multiplying power, after this, by 50 ℃ dryer, carry out drying, make polariscope, then, adopting PVA is bonding agent, and said products and TAC (triacetyl cellulose) film are fitted, and makes polaroid.The transmissivity of the polaroid that is obtained/polarisation luminosity is 43.7%/99.80%.
(comparative example 2)
Adopt Kuraray corporate system PVA (9X75R), by roller it is extended and handle.In the 1st bathes (35 ℃ of the aqueous solution of iodine, KI), after extending to the overall elongation multiplying power and being 3 times, in the 2nd bathes (40 ℃ of boric acid, KI aqueous solution), mode with 1.8 times is extended (total multiplying power is 5.4 times), in the 3rd bathes (60 ℃ of boric acid, KI aqueous solution), extends (total multiplying power is 6 times) in 1.11 times mode, after this, by 50 ℃ dryer, carry out drying, make polariscope.Then, adopting PVA is bonding agent, and said products and TAC (triacetyl cellulose) film are fitted, and makes polaroid.The transmissivity of the polaroid that is obtained/polarisation luminosity is 43.8%/99.80%.
(embodiment 1)
Adopt Kuraray corporate system PVA (9X75R), by roller it is extended and handle.In the 1st bathes (35 ℃ of the aqueous solution of iodine, KI), after extending to the overall elongation multiplying power and being 3 times, in the 2nd bathes (40 ℃ of boric acid, KI aqueous solution), mode with 1.3 times is extended (total multiplying power is 3.9 times), in the 3rd bathes (60 ℃ of boric acid, KI aqueous solution), extends (total multiplying power is 6 times) in 1.54 times mode, after this, by 50 ℃ dryer, carry out drying, make polariscope.Then, adopting PVA is bonding agent, and said products and TAC (triacetyl cellulose) film are fitted, and makes polaroid.The transmissivity of the polaroid that is obtained/polarisation luminosity is 44.1%/99.95%.
(embodiment 2)
Adopt Kuraray corporate system PVA (9X75R), by roller it is extended and handle.In the 1st bathes (35 ℃ of the aqueous solution of iodine, KI), after extending to the overall elongation multiplying power and being 3 times, in the 2nd bathes (40 ℃ of boric acid, KI aqueous solution), mode with 1.2 times is extended (total multiplying power is 3.9 times), in the 3rd bathes (60 ℃ of boric acid, KI aqueous solution), extends (total multiplying power is 6 times) in 1.67 times mode, after this, by 50 ℃ dryer, carry out drying, make polariscope.Then, adopting PVA is bonding agent, and said products and TAC (triacetyl cellulose) film are fitted, and makes polaroid.The transmissivity of the polaroid that is obtained/polarisation luminosity is 44.1%/99.95%.
The results are shown in Table 1 for it.
| Monomer transmission amount (%) | Polarisation luminosity (%) | Parallel transmission amount/quadrature transmission amount | |
| Comparative example 1 comparative example 2 embodiment 1 embodiment 2 | 43.7 43.8 44.1 44.1 | 99.80 99.80 99.95 99.95 | 510 508 1965 2183 |
Know that according to table 1 the monomer transmissivity of comparative example 1～2 and embodiment 1～2 and the difference of polarisation luminosity only be the degree less than radix point, but should poorly be bigger poor.This difference is for certifiable numerical value, if get the ratio of " the parallel transmissivity " that adopted when calculating polarisation luminosity and " quadrature transmissivity ", then shown in above-mentioned table like that, in comparative example and embodiment, it is bigger poor above-mentioned difference can be confirmed as.The contrast that the ratio of " parallel transmissivity " and " quadrature transmissivity " also can be used for observing polaroid.
Effect of the present invention
Effect of the present invention
According to above-described mode, the manufacture method of polarizer of the present invention relates to following method, namely by comprising the dyeing liquor of the iodine with dichromatic character, polyvinyl alcohol (PVA) film is dyeed, by crosslinking agent it is carried out crosslinking Treatment, and in above-mentioned steps, at least adopt pair of rolls, extend processing, make polarizer, the bath of putting into above-mentioned crosslinking agent is set to more than 2 kinds, in 1～4 times scope, the 2nd bathes later extension ratio extends processing greater than the mode of the above-mentioned the 1st extension ratio of bathing to above-mentioned liquid, thus according to the 1st extension ratio of bathing, can provide to have high-transmission rate, and the polarizer of the characteristic of high polarisation luminosity. In addition, the liquid crystal display with the polarizer that obtains by the method has high-transmission rate too, and the characteristic of high polarisation luminosity.
Claims (10)
1. the manufacture method of a polaroid, this method comprises the steps: by comprising the dyeing liquor of the iodine with dichromatic character, polyvinyl alcohol (PVA) (PVA) film is dyeed, by crosslinking chemical it is carried out crosslinking Treatment, and in above-mentioned steps, at least adopt pair of rolls, extend, it is characterized in that:
The bath of putting into above-mentioned crosslinking chemical is set to more than 2;
In 1～1.3 times scope, the 2nd bathes later extension ratio extends greater than the mode of the above-mentioned the 1st extension ratio of bathing according to the 1st extension ratio of bathing.
2. the manufacture method of polaroid according to claim 1 is characterized in that putting into relatively the 1st temperature of bathing of crosslinking chemical, and the 2nd temperature of bathing at least 1 later bath exceeds more than 5 ℃ than the crosslinked bath temperature of the 1st bath.
3. the manufacture method of polaroid according to claim 2, the 1st temperature of bathing that it is characterized in that putting into crosslinking chemical is 10～90 ℃ scope.
4. according to the manufacture method of any one the described polaroid in the claim 1～3, it is characterized in that the extension ratio at the PVA of the dye bath of putting into dyeing liquor film is 1.5～5 times.
5. according to the manufacture method of any one the described polaroid in the claim 1, the temperature of dye bath that it is characterized in that putting into dyeing liquor is 15～50 ℃ scope.
6. the manufacture method of a polaroid with reflecting plate or Transflective plate, is fitted with the polaroid of making according to any one the described method in the claim 1～5, forms reflection type polarizer or Transflective template polaroid.
7. the manufacture method of a polaroid with polarizer or λ plate, is fitted with the polaroid of making according to any one the described method in the claim 1～5, forms ellipse or circular polarizing disk.
8. the manufacture method of a polaroid with compensation film for angular field of view, is fitted with the polaroid of making according to any one the described method in the claim 1～5, forms polaroid.
9. the manufacture method of a polaroid improves film with bonding agent or bonding agent with brightness, fits with the polaroid of making according to any one the described method in the claim 1～5, forms polaroid.
10. LCD, this LCD have the polaroid of making according to the described method of claim 1～9 at least one side of liquid crystal cell.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011440600A CN100337134C (en) | 2001-10-03 | 2001-10-03 | Method for producing polaroid and liquid crystal display with poloroid |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011440600A CN100337134C (en) | 2001-10-03 | 2001-10-03 | Method for producing polaroid and liquid crystal display with poloroid |
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| CN1409136A CN1409136A (en) | 2003-04-09 |
| CN100337134C true CN100337134C (en) | 2007-09-12 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101815958B (en) * | 2008-06-09 | 2012-11-21 | 索尼公司 | Optical film and manufacturing method therefor, anti-glare film, polarizing element with optical layer, and display device |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4323269B2 (en) * | 2003-09-10 | 2009-09-02 | 住友化学株式会社 | Manufacturing method of polarizing film |
| JP2005084506A (en) * | 2003-09-10 | 2005-03-31 | Sumitomo Chemical Co Ltd | Polarizing film, its manufacturing method, polarizing plate, and optical laminate |
| JP4581689B2 (en) * | 2005-01-05 | 2010-11-17 | 住友化学株式会社 | Manufacturing method of polarizing film |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4591512A (en) * | 1985-01-25 | 1986-05-27 | Polaroid Corporation | Method of making light polarizer |
| JPH01295222A (en) * | 1988-05-23 | 1989-11-28 | Matsushita Electric Ind Co Ltd | Transparent electroconductive film |
| JPH02125202A (en) * | 1988-11-04 | 1990-05-14 | Toray Ind Inc | Polarizing film |
| US5691789A (en) * | 1995-10-30 | 1997-11-25 | Li; Le | Single-layer reflective super broadband circular polarizer and method of fabrication therefor |
| JP2001116922A (en) * | 1999-10-14 | 2001-04-27 | Nitto Denko Corp | Method of producing polarizing plate and polarizing film |
-
2001
- 2001-10-03 CN CNB011440600A patent/CN100337134C/en not_active Expired - Lifetime
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4591512A (en) * | 1985-01-25 | 1986-05-27 | Polaroid Corporation | Method of making light polarizer |
| JPH01295222A (en) * | 1988-05-23 | 1989-11-28 | Matsushita Electric Ind Co Ltd | Transparent electroconductive film |
| JPH02125202A (en) * | 1988-11-04 | 1990-05-14 | Toray Ind Inc | Polarizing film |
| US5691789A (en) * | 1995-10-30 | 1997-11-25 | Li; Le | Single-layer reflective super broadband circular polarizer and method of fabrication therefor |
| JP2001116922A (en) * | 1999-10-14 | 2001-04-27 | Nitto Denko Corp | Method of producing polarizing plate and polarizing film |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101815958B (en) * | 2008-06-09 | 2012-11-21 | 索尼公司 | Optical film and manufacturing method therefor, anti-glare film, polarizing element with optical layer, and display device |
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| CN1409136A (en) | 2003-04-09 |
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