CN100489572C - Polarized plate and its producing method and liquid crystal display - Google Patents
Polarized plate and its producing method and liquid crystal display Download PDFInfo
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- CN100489572C CN100489572C CNB011338288A CN01133828A CN100489572C CN 100489572 C CN100489572 C CN 100489572C CN B011338288 A CNB011338288 A CN B011338288A CN 01133828 A CN01133828 A CN 01133828A CN 100489572 C CN100489572 C CN 100489572C
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Abstract
A polarized light sheet can be used to improve LCD of nonuniform display caused by nonuniform dyeing. The dyeing bath with concentration of iodine or the dichroic dyestuff bigger than 0.02 wt.% should be used to control its temperature in the range of 15-50 degrees C and to control the stretching multiplying power less than 5 times as well as agitating the bath solution while dyeing, when the polyvinyl alcohol film is under the dyeing course.
Description
Technical field
The present invention relates to Polarizer and LCD, this Polarizer is used to show inhomogeneous, the inhomogeneous LCD that is improved that particularly dyes (below abbreviate " LCD " as).
Background technology
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 the occasion of monitor in recent years.
But the LCD that monitor is used compares with the purposes of personal computer, and its picture dimension increases, and the brightness of panel (briliancy) also strengthens.In addition, the LCD that monitor is used not only resembles and is used for the individual the personal computer, and the chance that a plurality of people watches is more, because not only from the front, but also from tilted direction, so requirement has the demonstration at higher visual angle.In addition, because monitor requires bright picture, so in most cases adopt bias light also to be the type of high brightness.Thus, be shown as black display, watch from tilted direction in addition, then see colored state inhomogeneous of Polarizer easily, the problem of seeing the inhomogeneous demonstration aspect of striated from the tensile axis direction of Polarizer is particularly arranged if make.So,, still require can't see the uneven Polarizer of dyeing even under the LCD situation that the brightness that is used for panel improves.
Here the uneven Polarizer of dyeing of can't see of indication refers to following Polarizer, promptly in this Polarizer, be not can't see by the 1 certifiable dyeing of Polarizer inhomogeneous, but it is inhomogeneous not only to can't see dyeing by 1 Polarizer, even under the situation of the mode perpendicular according to draw direction with two Polarizers overlapping (quadrature), it is inhomogeneous still to can't see dyeing.The dyeing of Polarizer is inhomogeneous not to be meant inhomogeneous to other general paper or the dyeing such, that see by monomer that produced when dyeing such as layer by dyestuff, and be meant by monomer can't see but when making two Polarizers be in perpendicular state, seen inhomogeneous.
Summary of the invention
The objective of the invention is in order to solve above-mentioned existing problem, provide a kind of and be used to improve because of inhomogeneous manufacture method, Polarizer and the LCD that causes the Polarizer that shows uneven LCD that dye.
To achieve these goals; in the manufacture method of Polarizer of the present invention; by having dichromatic dyestuff or iodine polyvinyl alcohol (PVA) (PVA) film is dyeed; by crosslinking chemical it is carried out crosslinking Treatment; in these steps or in the front and back of these steps; it is carried out stretch processing; after to its drying; on two surface or a surface, paste protective seam; it is characterized in that: in the above-mentioned dye bath of concentration with dichromatic dyestuff or iodine greater than 0.02wt%; the temperature of dye bath is in 15～50 ℃ scope, and the stretching ratio in the bath is less than 5 times, and dyes when the body lotion in the above-mentioned bath is stirred.When the concentration with above-mentioned dichromatic dyestuff or iodine during less than 0.02wt%, then dyeing concentration is not enough.In addition, when the temperature of above-mentioned dye bath during less than 15 ℃, then the swelling of PVA is insufficient, cause dyeing inhomogeneous easily, if said temperature greater than 50 ℃, then dissolves to the PVA membrane portions of base material, the generation swelling is inhomogeneous, cause dyeing inhomogeneous, be difficult to obtain the Polarizer of excellent optical characteristics, so preferably do not adopt this mode.In addition, if greater than 5 times, then being orientated, the stretching ratio in the dye bath too shifts to an earlier date, so preferably do not adopt this mode.Also have, if when above-mentioned body lotion is stirred it is dyeed, it is inhomogeneous then not produce dyeing, thus, also can improve and shows inhomogeneous (or spot).
In said method, in dye bath, be that the content of the iodide of representative also can be in the scope of 0.01～15wt% with the potassium iodide.
In addition, in said method, in dye bath, be that the content of the crosslinking chemical of representative also can be in the scope of 2～10wt% with boric acid.
In addition, in said method, best above-mentioned stirring is at least a kind of stirring selecting stirring from one group, this group stirs and comprises: adopt the stirring of helical blade, adopt the stirring of current, adopt hyperacoustic stirring, the stirring of injection air in bathing, adopt along with the stirring of the current of the perpendicular direction of draw direction and adopt along with the stirring of the rightabout current of draw direction.
Also have, also can be before staining procedure, as pre-treatment, by being that the swelling liquid of major component makes its swelling with water, or carrying out damping and handle, or carry out the processing of the stretching etc. of dry type.
Also can form following reflection-type Polarizer or Transflective Polarizer, wherein on the Polarizer of making by above-mentioned any described method, be pasted with reflecting plate or Transflective plate.
Also can form following ellipse or rotatory polarization plate, wherein on Polarizer, be pasted with polarizer or λ plate by above-mentioned any described method manufacturing.
Also can form following Polarizer, wherein on Polarizer, be pasted with compensation film for angular field of view by above-mentioned any described method manufacturing.
Also can form following Polarizer, wherein on the Polarizer of making by above-mentioned any described method, be pasted with brightness enhancement film by cementing agent or sticker.
Also can form following LCD,, have above-mentioned any described Polarizer wherein at least one side of liquid crystal cells.
Embodiment
The manufacture method of light polarizing film generally can roughly be divided into following 3 operations: putting into " dyeing process " that bath with dichromatic iodine or dyestuff is dyeed to the PVA film; Put into boric acid, in the bath of the crosslinking chemical of the PVA of borax etc. it is being carried out " the crosslinked operation " of crosslinking Treatment; Carry out " stretching process " of the stretching of PVA.In addition, " stretching process " is most usually to carry out when " dyeing process " and " crosslinked operation " carries out, but also can be used as independent operation carries out.In addition, dyeing process and crosslinked operation also can be carried out simultaneously.Light polarizing film is made like this; promptly after above-mentioned 3 operations; carry out drying; triacetyl cellulose (TAC) film of diaphragm will be formed; or the film of polyethylene-based resin, polyethylene terephthalate (PET) film etc., polystyrene resin, polycarbonate-based resin, polynorbornene are that the hyaline membrane of resin or acrylic resin is pasted on one or both sides.
The inventor finds, as analysis result that still can't see the uneven Polarizer of dyeing under the LCD situation to the high brightness that promptly is used in monitor etc., the concentration that has dichromatic dyestuff or iodine in the manufacturing process of above-mentioned Polarizer is greater than the in-process in the dye bath of 0.02wt%, the temperature of dye bath is in 15～50 ℃ scope, stretching ratio in the stretch bath is in 1～5 times scope, if dyeing when the solution in the above-mentioned bath is stirred does not then produce along the dyeing of the striated of draw direction inhomogeneous.
Here, in the occasion of the excessive concentration of dyestuff or iodine, owing to generally have the tendency that the transmissivity of Polarizer reduces, so above-mentioned concentration is preferably in the scope of 0.02～1.0wt%.Wherein, when adopting iodine to dye processing, because transmissivity is higher, cause high polarization luminosity, promptly dichromatism is higher, so preferably adopt above-mentioned scope.In addition, the occasion that the stretching ratio in dyeing is low excessively, owing to be difficult to carry out the traveling of stable PVA film, in order to produce the light polarizing film of excellent optical characteristics in batches, preferably stretching ratio is in 1.5～5 times scope.
In dye bath, except dyestuff or iodine, can also comprise the iodide of potassium iodide etc., or the crosslinking chemical of boric acid etc., the concentration of iodide can be in the scope of 0.01～15wt%, and the concentration of crosslinking chemical can be in the scope of 2～10wt%.As iodide, except potassium iodide, also can adopt lithium iodide, sodium iodide, zinc iodide, silver iodide, lead iodide, cupric iodide, barium iodide, calcium iodide, stannic iodide, titanium iodide etc., by iodide are made an addition in the dye bath, can improve dyeing efficient.In addition,, except adopting boric acid, also can adopt borax etc.,, can stably carry out the stretching of PVA film, help obtaining the good light polarizing film of inner evenness by crosslinking chemical is made an addition in the coloring agent as crosslinking chemical.These iodide and boric acid can be distinguished use separately, or use with array mode.
The stirring means of dye bath is not the method for regulation, can be arbitrary method.But,, then cause the inhomogeneous of dyeing, so best current directly do not contact with film because the track of current is residual easily if current are directly contacted with the PVA film.In addition, obviously, the temperature in preferably bathing also is uniform.In addition, the film in the bath preferably stretches to a certain degree according to unflagging mode, and in lax part, it is inhomogeneous to be easy to generate dyeing.So, when dyeing, also can when not producing wrinkle, dye by along the mode of laterally carrying out stretch-draw with more weak degree.In addition, can dye along roller, thereby not produce wrinkle.
Water flow velocity when stirring is spent slow occasion, the inhomogeneous inhibition effect that dyes is insufficient, on the other hand, in the occasion of excessive velocities, the PVA film is lax in bath, lax in order to eliminate, must carry out stretch-draw to the PVA film, thus according to the degree more than the essential value, for the orientation that prevents PVA produces unusually, best above-mentioned speed is in 0.3～10m/ scope of second.
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.
In addition, before staining procedure, as pre-treatment, also can be by being that the swelling liquid of major component carries out swelling and handles with water, damping is handled, or the processing of the stretching of dry type etc., the mode of these processing stretchings etc. is not special the qualification, can suitably adopt existing known method.
As polaroid (light polarizing film), can adopt following suitable form, wherein work as by method of the present invention, with the order that is fit to or mode, to by such as polyvinyl alcohol (PVA) or part dimethoxym ethane polyvinyl alcohol (PVA) etc., the film that the vinyl alcohol system polymer that is fit to for preparing according to existing mode forms, carry out the dyeing processing of the dichroic substance that forms by iodine or dichroic dye etc. or the processing of stretch processing or crosslinking Treatment etc., during incidence natural lights, the transmissive linearly polarized light.Particularly preferably adopt light transmission or the good type of polarization luminosity.
Be arranged at the diaphragm material of protective clear layer of the one or both sides of polaroid (light polarizing film) as formation, can adopt suitable hyaline membrane.As an example of its polymkeric substance, generally adopting the acetate fat of triacetyl cellulose etc. is resin, but is not limited thereto.
From aspects such as polarization characteristic and permanance, the transparent protective film that can especially preferably use is by alkali the tri acetyl cellulose membrane that saponification is handled to be carried out on the surface.In addition, the occasion of transparent protective film is set in the both sides of light polarizing film, also can adopts within it the outer transparent protective film that forms by different polymkeric substance etc.
Only otherwise damage purpose of the present invention, the transparent protective film that is used for diaphragm also can be to have carried out hard coating to handle or prevent that reflection from handling, and is the film of the processing of purpose etc. to prevent bonding or diffusion, anti-dazzle etc.It is to be the processing that purpose is carried out with the damage that prevents the Polarizer surface etc. that hard coating is handled; this processing can be by the formation such as mode of additional following cured film on the surface of transparent protective film, this cured film refer to such as the uv-hardening resin that is fit to of silicone-based etc., good cured film such as hardness and sliding.
Prevent to reflect that to handle be that the external light reflection that prevents with the Polarizer surface is the processing that purpose is carried out, it can prevent that reflectance coating etc. from realizing by forming according to existing mode.In addition; prevent bonding be with prevent with the bonding of adjoining course be purpose; it is that hinder situation that looking of Polarizer transmitted light recognize etc. to prevent light outside the surface reflection of Polarizer be the processing that purpose is carried out that anti-dazzle is handled; this processing can form by following manner; that is: by such as; the suitable mode of the uneven surface mode of sandblast mode, embossing processing mode etc. or the fit system of transparent fine particle etc. on the surface of transparent protective film, provides trickle concaveconvex structure.
Above-mentioned transparent fine particle exemplified such as, silicon dioxide or aluminium oxide, titanium dioxide or zirconia, 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 organic system fine particle of forming by crosslinked or uncrosslinked granular thing of polymkeric substance etc. etc.The consumption of transparent fine particle is generally: every transparent resin 100 weight portions are in the scope of 2～70 weight portions, and are particularly general in the scope of 5～50 weight portions.
The anti-dazzle photosphere that transparent fine particle cooperates can be used as protective clear layer itself, or as the lip-deep overlay of protective clear layer etc.Anti-dazzle photosphere also can be simultaneously as the diffusion layer (viewing angle compensation function etc.) that enlarges usefulness with the diffusion of Polarizer transmitted light, with the visual angle.In addition, above-mentioned prevent reflection horizon or bonding layer, diffusion layer or the anti-dazzle photosphere etc. of preventing also can be used as the optical layers that is formed by the thin plate that is provided with these layers, are set to be independent of the layer of protective clear layer.
In the present invention; polaroid (light polarizing film) and be not subjected to special qualification as the bonding processing between the transparent protective film of protective seam; its can by such as; the sticker that forms by vinyl alcohol system polymer, or the sticker that is formed by the water-soluble cross-linker of the vinyl alcohol system polymer of boric acid or borax, valeral, melamine, oxalic acid etc. at least etc. carries out.Above-mentioned adhesive linkage can be used as the formation such as coating drying layer of aqueous solution, but in modulation during this aqueous solution, as required, also can with other adjuvant, the catalyzer of acid etc. cooperates.
Polarizer of the present invention can be used as the optics stacked with other optical layers when practical application.This optical layers is not special the qualification; but can adopt such as; reflecting plate and Transflective plate; polarizer (also comprises 1/2 wavelength plate; the λ plate of 1/4 wavelength plate etc.); being suitable for of compensation film for angular field of view or brightness enhancement film etc. forms the optical layers of LCD more than 1 layer or 2 layers; particularly preferably adopt above-mentioned of the present invention; also be stacked with reflecting plate on the Polarizer that forms by polaroid and protective seam; or the reflection-type Polarizer of Transflective plate or Semitransmissive reflecting plate Polarizer; employing is above-mentioned of the present invention; also be stacked with the ellipse or the rotatory polarization plate of polarizer on the Polarizer that forms by polaroid and protective seam; employing is above-mentioned of the present invention; the Polarizer of stacked compensation film for angular field of view also on the Polarizer that forms by polaroid and protective seam, or adopt above-mentioned of the present invention; also be stacked with the Polarizer of brightness enhancement film on the Polarizer that forms by polaroid and protective seam.
When above-mentioned reflecting plate is described, reflecting plate is arranged on the Polarizer, it is used to form the reflection-type Polarizer, the reflection-type Polarizer is arranged at the inboard of liquid crystal cells usually, it can form the incident light of recognizing side (demonstration side) to considering oneself as and reflect, thereby the LCD that realize to show etc., thereby its inside with the light source that can omit bias light etc. is provided with the advantage of the thickness that is easy to reduce LCD.
The formation of reflection-type Polarizer can be as required, carries out in the suitable mode of mode that the reflection horizon that is formed by metal etc. is set on a face of Polarizer by above-mentioned transparent protective film etc. etc.By the way,, can exemplify out following example etc., wherein as required, on a face that has carried out the transparent protective film that rough surface handles, paper tinsel or vapor-deposited film that the reflective metal by aluminium etc. forms are set, the formation reflection horizon as its concrete example.
In addition, can also exemplify out following reflection-type Polarizer etc., in this Polarizer, comprise on above-mentioned transparent protective film fine particle, that form the 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 and can suppress the uneven advantage of light and shade etc.The formation in the reflection horizon of the trickle concaveconvex structure of the surface detail micro concavo-convex structure of reflection transparent protective film can be by 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 the mode to replace directly being provided with such as following reflector plate on the transparent protective film of above-mentioned Polarizer, in this reflector plate, is provided with the reflection horizon according to the film that is fit to of this transparency protected film preparation.Reflection horizon in the reflecting plate is formed by metal usually; from preventing the reduction of the reflectivity that oxidation causes; the long-term aspect that continues of initial reflectance, or avoid the aspect etc. of the independent setting of protective seam preferably adopts the type of service of the state that its reflecting surface covers by film or Polarizer etc.
In addition, the Semitransmissive Polarizer is by above-mentioned reflective layer reflects light, and the reflection horizon of the Semitransmissive of half-mirror that can be by transmission etc. obtains.The Semitransmissive Polarizer is arranged at the inboard of liquid crystal cells usually, be to use in the bright atmosphere occasion of LCD etc., the incident light that reflecting considers oneself as recognizes side (demonstration side) is with displayed image, in darker atmosphere, can form the LCD of following type etc., in this display, adopt the rear side be arranged at the Semitransmissive Polarizer bias light etc. in establish light source with displayed image.That is, the Semitransmissive Polarizer can be saved the energy that the light source of bias light etc. uses under bright atmosphere, same under darker atmosphere, establishes the LCD of light source etc. in can adopting.
To on above-mentioned Polarizer of the present invention, that formed by polaroid and protective seam, also the ellipse of stacked polarizer or rotatory polarization plate are described below.
Linearly polarized light is being changed into ellipse or circularly polarized light, or change ellipse or circularly polarized light into linearly polarized light, or the occasion of the direction of polarized light of change linearly polarized light, adopt polarizer etc., particularly as linearly polarized light being changed into ellipse or circularly polarized light, or change ellipse or circularly polarized light the polarizer of linearly polarized light into, adopt so-called 1/4 wavelength plate (being also referred to as " λ/4 plates ").1/2 wavelength plate (being also referred to as " λ/2 plates ") is generally used for changing the occasion of the direction of polarized light of linearly polarized light.
Elliptical polarization plate is used for following occasion etc. effectively, and in this occasion, painted (blue or green 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, can make when vergence direction is watched the picture of LCD, produce painted also be compensated (preventing) like this.It is the occasion etc. of picture tone of the reflection LCD of colour demonstration that the rotatory polarization plate is used for adjusting such as, image effectively, in addition, also has the function of reflecting of preventing.
By the way, instantiation as above-mentioned polarizer, can exemplify out following type etc., wherein to by polycarbonate, the film that the such suitable polymkeric substance of polyvinyl alcohol (PVA), polystyrene or polymethylmethacrylate, polypropylene or other polyolefin, polyarylate or polyamide forms carries out stretch processing and the birefringence film that forms, or the alignment films of liquid crystal polymer, the type of the oriented layer by film supporting liquid crystal polymer etc.In addition, as the tilted alignment film, can exemplify out, such as, heat-shrinkable film and polymer film is bonding, under the effect of the convergent force that heating produces, polymer film is carried out stretch processing or/and the type of shrink process, or make the type of liquid crystal polymer tilted alignment.
Below this Polarizer is described, that is: in this Polarizer, on the above-mentioned Polarizer that forms by polaroid and protective seam of the present invention, also is stacked with compensation film for angular field of view.
Compensation film for angular field of view is the film that is used to enlarge the visual angle, even make not vertical with picture and watch along the direction of inclination slightly under the situation of picture of LCD, still can see image more brightly.
As such compensation film for angular field of view, adopt on tri acetyl cellulose membrane etc. the type of coating plate-like (discotic) liquid crystal, or polarizer.Common polarizer adopts to have along the birefringent polymer film of its surface direction according to uniaxial tension, relative therewith, polarizer employing as compensation film for angular field of view has along surface direction according to biaxial stretch-formed birefringent polymer film, or the such biaxial stretching film of tilted alignment polymer film etc., in this tilted alignment polymer film, to along the face direction according to uniaxial tension, the refractive index of the thickness direction that stretches along thickness direction is controlled in addition.As the tilted alignment 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 is carried out stretch processing or/and the type of shrink process, or make type of liquid crystal polymer tilted alignment etc.The raw polymer employing of polarizer and the polymer phase composition together described in the polarizer in front.
The Polarizer of pasting brightness enhancement film on the above-mentioned Polarizer that is formed by polaroid and protective seam of the present invention uses according to the mode of the inboard that is arranged at liquid crystal cells usually.Brightness enhancement film presents following characteristic; that is: by the time from the incidents such as natural light of the bias light of LCD etc. or inner reflection; with the linearly polarized light of regulation polarizing axis or the circularly polarized light reflection of prescribed direction; and other transmittance; Polarizer that form makes the light incident from light sources such as bias lights to brightness enhancement film with the Polarizer that is formed by above-mentioned Polarizer and protective seam is stacked; obtain the transmitted light of the polarized light state of regulation, the not transmission of light beyond the afore mentioned rules polarized light state simultaneously and being reflected.Reflection horizon by being arranged at rear side more and will turning back by the light of above-mentioned brightness enhancement film surface reflection, incide the brightness reinforcement plate once more, make its part or all transmittance as the regulation polarized light state, making from the light quantity of brightness enhancement film transmission increases, supply with the polarized light that is difficult to for the polaroid absorption simultaneously, make to can be used for the light quantity that liquid crystal image shows etc. and increase, brightness is increased.That is, not adopting brightness enhancement film by bias light etc. from the inboard of liquid crystal cells the occasion by the polaroid incident light, the major part that has with the light of the inconsistent direction of polarized light of polarizing axis of polaroid is that polaroid absorbs, not from the polaroid transmission.That is, although the difference with the characteristic of the polaroid that is adopted also, about 50% light is that polaroid absorbs, and can be used for the light quantity that the liquid crystal image shows etc. and reduces visual deepening.Brightness enhancement film makes the light with the direction of polarized light that can be polarized the sheet absorption not incide polaroid, and carry out following process repeatedly, promptly in case this light is reflected by brightness enhancement film, then turn back in this light reflection horizon by being arranged at rear side more etc., incide the brightness reinforcement plate once more, thereby make between realize reflection, the polarisation of light light direction that turns back becomes this brightness enhancement film of polarized light transmission that can pass through the direction of polarized light of polaroid, it is supplied with polaroid, thus, the image that the light of bias light etc. can be used for effectively LCD shows, makes picture bright.
As above-mentioned brightness enhancement film, can adopt such as, the multilayer stack of the film that dielectric multilayer film or refractive index anisotropy are different is such, present transmission regulation polarizing axis linearly polarized light and with other the type (" D-BEF " that 3M company produces etc.) of characteristic of light reflection, with cholesteric, particularly the alignment films of cholesteric liquid crystal polymer or its aligned 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 the film that is fit to of the type etc. of the characteristic that any one circularly polarized light reflection in left-handed or the dextrorotation is realized other light transmission.
Therefore, in the brightness enhancement film of the type of the linearly polarized light of above-mentioned polarizing axis that transmission is decided, the mode according to the polarizing axis alignment incides Polarizer with this transmitted light same as before, can suppress the absorption loss of Polarizer thus on one side, Yi Bian transmitted light effectively.On the other hand resemble the cholesteric, in the brightness enhancement film of the type of transmission circularly polarized light, also above-mentioned illumination former state can be incided polaroid, but from suppressing the aspect of absorption loss, preferably pass through polarizer, this transmission circularly polarized light is carried out linearly polarized light handle, make it incide Polarizer again.By the way, adopt 1/4 wavelength plate, thus, can change circularly polarized light into linearly 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 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 Polarizer and the brightness enhancement 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, the type of the broad wavelength coverage reflection circle polarized light that can obtain in the visible region etc. according to this situation, can obtain the transmission circularly polarized light of the wavelength coverage of broad.
In addition, Polarizer of the present invention also can form by following mode, and is in this Polarizer, as above-mentioned polarized light divergence type Polarizer, that Polarizer and the optical layers more than 2 layers or 3 layers is stacked.Therefore, also can be with the reflection-type elliptical polarization plate of above-mentioned reflection-type Polarizer or Semitransmissive Polarizer and polarizer combination or Semitransmissive elliptical polarization plate etc.The optics that is stacked with the optical layers more than 2 layers or 3 layers is for can be according to distinguishing the type that stacked mode forms successively in the manufacture process of LCD etc., but the parts of stacked in advance formation 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 way of adhesive linkage etc.
In Polarizer of the present invention or optics, the adhesive linkage of using with other adhering components of liquid crystal cells etc. can be set also.This adhesive linkage can be by acrylic acid series etc., and the sticker of making according to existing mode that is fit to 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 cells prevents and from the aspect of formability of high-quality and 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 arranged on the necessary face as required, such as, if relate to the protective seam of the Polarizer that forms by polaroid and protective seam of the present invention, then can be as required, at the one or both sides of protective seam adhesive linkage is set.
The occasion of exposing on the surface at the adhesive linkage that is arranged on Polarizer 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; this mode is: on the thin slice body that is fit to that the mode according to above-mentioned transparent protective film etc. prepares; as required, the remover that is fit to silicone-based or chain alkyl system, fluorine system or molybdenum sulfide etc. is provided with peel ply.
Also have; each layer that forms the light polarizing film of above-mentioned Polarizer 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 ultraviolet light absorber processing of salicylate based compound or benzophenone based compound, benzotriazole based compound or cyanoacrylate based compound, nickel complex salt based compound etc. etc. makes it have the UVA function.
Best Polarizer 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 Polarizer of the present invention is arranged at the one or both sides mode of liquid crystal cells, or a Transflective dual-purpose type etc., meet the suitable structure of existing mode.Therefore, the liquid crystal cells that forms LCD is arbitrarily, such as, can adopt with the film transistor type liquid crystal cells of the active matrix drive type that is representative, with stable twisted nematic or STN Super TN type the liquid crystal cells of suitable type of liquid crystal cells etc. of the pure matrix drive type of representative.
In addition, the occasion of Polarizer or optics is set in the both sides of liquid crystal cells, 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 bias light etc. be set in the mode more than 1 layer or 2 layers in the position that is fit to.
Even Polarizer of the present invention also be can't see the inhomogeneous or spot that dyeing causes on the LCD that the high brightness monitor is used etc.
Below by following embodiment, the present invention is carried out more concrete description.
(comparative example 1)
Adopt PVA (9P75R) film (thickness is 75 μ m) of Kuraray corporate system, at iodine concentration is in the dye bath (35 ℃) of 0.3wt% and KI (concentration is 3wt%), at the state that solution is not stirred, stretch with 2 times stretching ratios, after dyeing, crosslinked bath (50 ℃) putting into boric acid (concentration is 6wt%) stretches to it with 2.5 times stretching ratio, is 5 times mode stretch (thickness is 28 μ m) according to total stretching ratio.Under the state that solution is not stirred, dye, this mode is an existent method.
After this, carry out drying, make polaroid, then, paste TAC (triacetyl cellulose) film, make Polarizer with sticker by 60 ℃ dryers.The transmissivity of the Polarizer that is obtained/polarization luminosity is 41.5%/99.95%.
(embodiment 1)
Except dye bath being carried out the condition of stirring,, make Polarizer according to the mode identical with comparative example 1 with current (2m/ second).At this moment, current directly do not contact with the PVA film.The transmissivity of the Polarizer that is obtained/polarization luminosity is 44.6%/99.94%.
(evaluation method 1 of the spot of Polarizer)
In the darkroom, illumination is on the bias light of 33000Lux, make the polarizing axis of 2 Polarizers estimating be in quadrature, watch, confirm by looking the spot of the striated of recognizing the direction (draw direction) that whether can see that edge and polarizing axis are perpendicular from positive and vergence direction.
(evaluation method 2 of the spot of Polarizer)
The Polarizer up and down that is pasted on the liquid crystal cells of LCD monitor (300 bank) of product sold on the market is peeled, adopt sticker, along pasting the Polarizer of estimating up and down, then, make the black display that is shown as of monitor, change the visual angle of watching monitor into front and vergence direction, confirm whether can to see along and the spot of bar (striped) shape of the perpendicular direction (draw direction) of the polarizing axis of Polarizer.
(evaluation method 3 of the spot of Polarizer)
In the darkroom, illumination is on the bias light of 33000Lux, places 1 Polarizer estimating, watches from positive and vergence direction, confirms by looking the spot of the striated of recognizing the direction (draw direction) that whether can see that edge and polarizing axis are perpendicular.
The results are shown in Table 1 for it.
Table 1
Know according to table 1, in the Polarizer monomer, realize the Polarizer (comparative example 1) that dyes, all be speckless with the Polarizer (embodiment 1) of when stirring, realizing dyeing in the mode that dye bath is not stirred.But at quadrature, in embodiment 1, because dye bath is stirred, so it is inhomogeneous inhomogeneous with demonstration to can't see dyeing, this situation in comparative example 1, owing to dye bath is not stirred, sees that dyeing is inhomogeneous and demonstration is inhomogeneous relatively.
As mentioned above, in the manufacture method of Polarizer of the present invention, because when polyvinyl alcohol (PVA) (PVA) film is dyeed, in the dye bath of the concentration with dichromatic dyestuff or iodine greater than 0.02wt%, the temperature of dye bath is in 15～50 ℃ scope, stretching ratio in the bath is less than 5 times, and is used to improve the Polarizer of the inhomogeneous uneven LCD of demonstration that causes of dyeing by dyeing when above-mentioned liquid is stirred, can making.
Claims (10)
1. method of making Polarizer; wherein; by having dichromatic dyestuff or iodine polyvinyl alcohol film is dyeed; by crosslinking chemical it is carried out crosslinking Treatment; in these operations or in the front and back of these operations, it is carried out stretch processing, after to its drying; on two surface or a surface, paste protective seam, it is characterized in that:
In above-mentioned concentration with dichromatic dyestuff or iodine is in the dye bath of 0.02～1.0wt%, the temperature of dye bath is in 15～50 ℃ scope, stretching ratio in the bath is below 5 times, and when being stirred, the body lotion in the above-mentioned bath dyes, wherein, the current of body lotion directly do not contact with polyvinyl alcohol film in the process of described stirring.
2. the manufacture method of Polarizer according to claim 1, wherein, in dye bath, the content of iodide is in the scope of 0.01～15wt%.
3. the manufacture method of Polarizer according to claim 1, wherein, in dye bath, the content of crosslinking chemical is in the scope of 2～10wt%.
4. the manufacture method of Polarizer according to claim 1, wherein, above-mentioned stirring is at least a kind of stirring selecting stirring from one group, this group stirs and comprises: adopt the stirring of helical blade, adopt the stirring of current, adopt hyperacoustic stirring, the stirring of injection air in bathing, adopt along with the stirring of the current of the perpendicular direction of draw direction and adopt along with the stirring of the rightabout current of draw direction.
5. the manufacture method of Polarizer according to claim 1 wherein, before staining procedure, as pre-treatment, by being that the swelling liquid of major component makes its swelling with water, or being carried out damping and is handled, or carry out the processing of dry type stretching.
6. reflection-type Polarizer or Transflective Polarizer wherein, are pasted with reflecting plate or Transflective plate on the Polarizer by any one the described method manufacturing in the claim 1～5.
7. ellipse or rotatory polarization plate is characterized in that: be pasted with polarizer or λ plate on the Polarizer by any one the described method manufacturing in the claim 1～5.
8. a Polarizer wherein, is pasted with compensation film for angular field of view on the Polarizer by any one the described method manufacturing in the claim 1～5.
9. a Polarizer wherein, on the Polarizer of making by any one the described method in the claim 1～5, is pasted with brightness enhancement film by cementing agent or sticker.
10. a LCD wherein, at least one side of liquid crystal cells, has any one the described Polarizer in the claim 6～9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011338288A CN100489572C (en) | 2001-10-03 | 2001-10-03 | Polarized plate and its producing method and liquid crystal display |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011338288A CN100489572C (en) | 2001-10-03 | 2001-10-03 | Polarized plate and its producing method and liquid crystal display |
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| Publication Number | Publication Date |
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| CN1409135A CN1409135A (en) | 2003-04-09 |
| CN100489572C true CN100489572C (en) | 2009-05-20 |
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| Application Number | Title | Priority Date | Filing Date |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI641877B (en) * | 2016-03-15 | 2018-11-21 | 日商住友化學股份有限公司 | Elliptical polarizer |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1321334C (en) * | 2004-03-17 | 2007-06-13 | 力特光电科技股份有限公司 | Pre-treatment method for plastic film in polarizing board |
| CN100460900C (en) * | 2005-11-30 | 2009-02-11 | 达信科技股份有限公司 | Method for making polarizing lens |
| KR100908184B1 (en) * | 2006-07-31 | 2009-07-16 | 주식회사 엘지화학 | Polarizing plate and liquid crystal display device using same |
| JP4948305B2 (en) * | 2007-07-23 | 2012-06-06 | 合同資源産業株式会社 | Method and system for circulating use of polarizing film manufacturing chemicals |
| KR101338995B1 (en) | 2008-06-10 | 2013-12-09 | 엘지디스플레이 주식회사 | Liquid crystal display device |
| CN103278878A (en) * | 2013-06-27 | 2013-09-04 | 佛山纬达光电材料有限公司 | Processing technology of polarizer |
| JP6105795B1 (en) * | 2015-11-27 | 2017-03-29 | 住友化学株式会社 | Manufacturing method of polarizer |
-
2001
- 2001-10-03 CN CNB011338288A patent/CN100489572C/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI641877B (en) * | 2016-03-15 | 2018-11-21 | 日商住友化學股份有限公司 | Elliptical polarizer |
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| CN1409135A (en) | 2003-04-09 |
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