CN102597861A - Liquid crystal display device, and set of optical members for liquid crystal display device - Google Patents

Liquid crystal display device, and set of optical members for liquid crystal display device Download PDF

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Publication number
CN102597861A
CN102597861A CN201080046604XA CN201080046604A CN102597861A CN 102597861 A CN102597861 A CN 102597861A CN 201080046604X A CN201080046604X A CN 201080046604XA CN 201080046604 A CN201080046604 A CN 201080046604A CN 102597861 A CN102597861 A CN 102597861A
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China
Prior art keywords
liquid crystal
film
light source
backlight
optical sheet
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CN201080046604XA
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CN102597861B (en
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香川佳美
李亚丽
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Sumitomo Chemical Co Ltd
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Sumitomo Chemical Co Ltd
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    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133528—Polarisers
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
    • G02B5/3033—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid
    • G02B5/3041—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid comprising multiple thin layers, e.g. multilayer stacks
    • G02B5/305—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid comprising multiple thin layers, e.g. multilayer stacks including organic materials, e.g. polymeric layers
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/28—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising
    • G02B27/281—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising used for attenuating light intensity, e.g. comprising rotatable polarising elements
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G02B5/3083—Birefringent or phase retarding elements
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133502—Antiglare, refractive index matching layers
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/13363—Birefringent elements, e.g. for optical compensation

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Liquid Crystal (AREA)
  • Polarising Elements (AREA)

Abstract

Disclosed is a liquid crystal display device which comprises a backlight (20) and a liquid crystal panel (80) that is arranged on the backlight. The liquid crystal panel comprises a liquid crystal cell (50) and polarizing plates (60, 70) that are bonded to both surfaces of the liquid crystal cell. The light incident-side polarizing plate (60) that is arranged on the backlight side of the liquid crystal cell comprises a polarizing film (31) that is formed of a polyvinyl alcohol resin and an optically anisotropic light source-side protective film (32) that is arranged on the backlight-side surface of the polarizing film. The backlight comprises a surface light source (10) and an optically anisotropic optical sheet member (12) that is arranged at a position closest to the liquid crystal panel. The light source-side protective film and the optical sheet member are arranged so that the angle between the slow axis of the light source-side protective film and the slow axis of the optical sheet member is not more than 60 DEG. The liquid crystal display device has less color unevenness and excellent visibility, and can be formed thin while exhibiting excellent cost performance.

Description

Liquid crystal indicator and liquid crystal display optical unit construction
Technical field
The present invention relates to possess the liquid crystal indicator of backlight and optics combination that liquid crystal indicator is used.
Background technology
In recent years, low, the work under low-voltage of consumed power, lightweight and slim liquid crystal indicator are popularized rapidly with display device with information such as monitor and TVs as portable phone, portable information terminal, computing machine.And then, be accompanied by the development of liquid crystal technology, the liquid crystal indicator of various patterns has been proposed, progressively solved the problem of liquid crystal indicators such as answer speed in the past, contrast and field angle.
On the other hand, according to the further slim lightweight strong request of the liquid crystal indicator in market, liquid crystal panel, diffuser plate, backlight unit and the drive IC etc. that constitute liquid crystal indicator are just in slimming or miniaturization.Under such situation, also require to carry out slimming with the unit of 10 μ m as the polarization plates of the parts that constitute liquid crystal panel.
Simultaneously, be accompanied by popularizing of liquid crystal indicator, lowering the requirement from the cost in market also strengthens day by day, and polarization plates also must reduce cost, improve productivity.
In order to satisfy these requirements, various schemes have been proposed so far.For example; The one or both sides that polarization plates has polarizing coating usually are provided with the formation of transparent protective film; As this transparent protective film; Usually use triacetyl cellulose, but shown in JPH08-43812-A, thereby extensively attempted through making this diaphragm have phase differential and giving optical compensation function and seek the minimizing of component parts and the simplification of production process.Through being set at such formation, can make the slim lightweight of composite polarizing plate as the sandwich of polarization plates and polarizer, and then; Through reducing the component parts quantity of liquid crystal indicator; Can simplify production process, improve yield rate, thereby reduce cost.
And then, also actively carried out trial with other resin substitution diaphragm beyond the triacetyl cellulose.For example, in JPH07-77608-A, a kind of method of using annular ethylene series resin to replace triacetyl cellulose is disclosed.But annular ethylene series resin is expensive, so present situation is: be used for the higher phase retardation film of surcharge, the viewpoint from cutting down cost only as diaphragm the time is considered, has uneven such problem.
As the technology that satisfies above-mentioned requirements, for example proposed with the method for polyethylene terephthalate film as diaphragm.The physical strength of polyethylene terephthalate is excellent, is suitable for filmization, can realize the slimming of polarization plates.And then, compare with triacetyl cellulose or annular ethylene series resin, consider to have superiority usually from the cost aspect.In addition, compare, have characteristics such as low-moisture permeability and low water absorbable, so humidity resistance, cold-resistant thermal shock property are also excellent, can also expect that environmental change is also had high-durability with triacetyl cellulose.
But on the other hand, the common optical anisotropy of stretching polyethylene terephthalate film that is suitable for diaphragm is big, shows high length of delay.Such has optically anisotropic film when being installed in the liquid crystal indicator will having adopted as the polarization plates of diaphragm; With tri acetyl cellulose membrane is compared as the common polarization plates of diaphragm; Existence from the irregular colour of tilted direction (be also referred to as interfere uneven, rainbow is uneven) obviously, the problem that the identification difference is such.About this problem; Following method is for example disclosed in JP2009-109993-A: through combination the polyethylene terephthalate film is constituted liquid crystal indicator as the polarization plates of diaphragm and the polarization plates of having given the antiglare layer of control mist value, thereby reduce irregular colour.But even use the minimizing of this method irregular colour also not necessarily talkative fully, and the physics value of diaphragm itself is restricted, thereby causes the restriction of production aspect, the therefore easier and effective method of expectation establishment.
Therefore; The object of the present invention is to provide a kind of liquid crystal indicator; It is the liquid crystal indicator that comprises backlight and be configured in the liquid crystal panel on the backlight; Even will have under the situation of optically anisotropic film as the light incident side polarization plates of light source side diaphragm having installed, irregular colour is few, identification is excellent and realized that slimming, cost performance are also excellent.
In addition, another object of the present invention is to provide a kind of optics combination that is suitable for above-mentioned liquid crystal indicator.
The inventor furthers investigate in order to solve above-mentioned irregular colour problem always.Its result finds; Possessing backlight and be configured in the liquid crystal indicator of the liquid crystal panel on the backlight; Be equipped with to have under the situation of polarization plates that optically anisotropic film is the light source side diaphragm as the light incident side polarization plates; Slow axis and the above-mentioned formed angle of slow axis (axle deviation angle) with optically anisotropic optical sheet parts through having optically anisotropic light source side diaphragm are set at below 60 °, can effectively reduce the irregular colour of liquid crystal indicator.Through using this method, can be under the situation that does not increase new parts realize high identification and slimming, cost degradation with easy method and deposit.Need to prove that in the present invention, the slow axis and above-mentioned with optically anisotropic light source side diaphragm has the formed angle of slow axis of optically anisotropic optical sheet parts (axle deviation angle) and is meant, angle less than normal, i.e. angle below 90 °.
Summary of the invention
That is, the present invention includes following content.
[1] a kind of liquid crystal indicator, it possesses backlight and is configured in the liquid crystal panel on this backlight,
This liquid crystal panel comprises liquid crystal cells and the polarization plates that is fitted in the two sides of this liquid crystal cells,
In the said polarization plates, the light incident side polarization plates that is configured in the backlight side of liquid crystal cells have the polarizing coating that comprises polyvinyl alcohol resin and be layered in this polarizing coating the backlight side have an optically anisotropic light source side diaphragm,
Said backlight comprises the area source of full run-down type or side light type and is configured in from nearest locational of said liquid crystal panel to have optically anisotropic optical sheet parts,
According to the slow axis of said light source side diaphragm and the formed angle of slow axis of said optical sheet parts is the mode below 60 degree, disposes said light source side diaphragm and said optical sheet parts.
[2] according to [1] described liquid crystal indicator, wherein, phase difference value is more than the 200nm in the face of said light source side diaphragm.Under this situation, can obtain remarkable result of the present invention.
[3] according to [1] or [2] described liquid crystal indicator, wherein, said light source side diaphragm is a stretching polyethylene terephthalate film.This scheme is preferred.
[4] according to each described liquid crystal indicator in [1]～[3], wherein, said optical sheet parts are selected from the group of being made up of diffusion barrier, lenticule film and lens.This scheme is preferred.
[5] according to each described liquid crystal indicator in [1]～[4], wherein, be set at n in refractive index with the slow-axis direction in the face x, the refractive index with the direction of slow axis quadrature in face is set at n y, thickness direction refractive index be set at n zThe time, (the n of said light source side diaphragm x-n z)/(n x-n y) shown in the Nz coefficient be more than 4 or less than 2.This scheme is preferred.
[6] according to each described liquid crystal indicator in [1]～[5], wherein, phase difference value is more than the 1000nm in the face of said optical sheet parts.This scheme is preferred.
[7] a kind of optics combination; It is used for possessing the liquid crystal indicator of liquid crystal cells and backlight; It comprises: what the light incident side polarization plates and being used to that is used to be configured in the said backlight side of said liquid crystal cells was configured in said backlight has optically anisotropic optical sheet parts from nearest locational of said liquid crystal cells
Said light incident side polarization plates have the polarizing coating that comprises polyvinyl alcohol resin and be layered in said polarizing coating one side have an optically anisotropic light source side diaphragm; When being used for liquid crystal indicator; This light incident side polarization plates disposes in the mode of said backlight side according to this light source side diaphragm; And, be that mode below 60 ° disposes said light source side diaphragm and said optical sheet parts according to the formed angle of slow axis of the slow axis of said light source side diaphragm and said optical sheet parts.
[8] according to [7] described optics combination, wherein, phase difference value is more than the 200nm in the face of said light source side diaphragm.Under the situation of this scheme, can obtain remarkable result of the present invention.
[9] according to [7] or [8] described optics combination, wherein, said light source side diaphragm is a stretching polyethylene terephthalate film.This scheme is preferred.
[10] according to each described optics combination in [7]～[9], wherein, said optical sheet parts are selected from the group of being made up of diffusion barrier, lenticule film and lens.This scheme is preferred.
[11] according to each described optics combination in [7]～[10], wherein, be set at n in refractive index with the slow-axis direction in the face x, the refractive index with the direction of slow axis quadrature in face is set at n y, thickness direction refractive index be set at n zThe time, (the n of said light source side diaphragm x-n z)/(n x-n y) shown in the Nz coefficient be more than 4 or less than 2.This scheme is preferred.
[12] according to each described optics combination in [7]～[11], wherein, phase difference value is more than the 1000nm in the face of said optical sheet parts.This scheme is preferred.
According to the present invention; Can the liquid crystal indicator that irregular colour is few, identification is excellent when showing be provided through being set at below 60 ° with respect to the deviation angle of the slow axis of the optical sheet parts on the surface of liquid crystal panel side slow axis, that be configured in backlight of the light source side diaphragm of light incident side polarization plates.In addition, according to the present invention, the optics that is suitable for above-mentioned liquid crystal indicator combination can also be provided.
The accompanying drawing simple declaration
Fig. 1 is the schematic cross-section that shows a layer example that constitutes of liquid crystal indicator of the present invention.
Embodiment
< liquid crystal indicator >
Fig. 1 is the schematic cross-section that shows a layer example that constitutes of liquid crystal indicator of the present invention, is the figure that shows the transmission type liquid crystal display device of the backlight that possesses full run-down type or side light type.
Liquid crystal indicator shown in Figure 1 of the present invention is made up of backlight 20 and the liquid crystal panel 80 that is configured on the backlight 20.
Liquid crystal panel 80 is layered in the one side of liquid crystal cells 50 by liquid crystal cells 50, across adhesive phase 34 light incident side polarization plates 30 and the light emitting side polarization plates 40 that is layered in the another side of liquid crystal cells 50 across adhesive phase 44 constitute.Liquid crystal panel 80 is usually through forming adhesive phase 34,44 respectively on the one side of polarization plates 30,40; Be made as the light incident side polarization plates 60 of band adhesive phase and the light emitting side polarization plates 70 of band adhesive phase, they conformed to liquid crystal cells 50 with its adhesive phase side make.
Light incident side polarization plates 30 is at the one side of polarizing coating 31 (becoming the face of backlight side) configuration light source side diaphragm 32, forms at another side (liquid crystal cell side) configuration " cell side diaphragm or optical compensation films " 33.Adhesive phase 34 is layered on the surface of cell side diaphragm or optical compensation films 33 sides of light incident side polarization plates 30.
The formation of light incident side polarization plates 30 as shown in Figure 1 considers it is favourable from the slim light-weighted viewpoint of polarization plates, in addition, owing to can reduce the component parts quantity of liquid crystal indicator, therefore brings the simplification of production process and the raising of yield rate.
Light emitting side polarization plates 40 be at polarizing coating 41 one side (with the face of liquid crystal cells opposition side) configuration protection film 42, at another side (liquid crystal cell side) configuration " cell side diaphragm or optical compensation films " 43 and form.Adhesive phase 44 is layered on the surface of cell side diaphragm or optical compensation films 43 sides of light emitting side polarization plates 40.
In addition; In example shown in Figure 1, backlight 20 possesses area source 10, be configured in the rear side of area source 10 (and liquid crystal panel 80 opposition sides) reflecting plate 11 and be configured in area source 10 and liquid crystal panel 80 between optical sheet parts 12 (for example diffusion barrier or micro-lens sheet etc.).
In liquid crystal indicator of the present invention; For example in liquid crystal indicator with layer formation as shown in Figure 1; According to the slow axis with optically anisotropic light source side diaphragm 32 of backlight 20 sides that in light incident side polarization plates 30, are configured in polarizing coating 31 with in backlight 20, to be configured in from the nearest locational formed angle of slow axis (axle deviation angle) with optically anisotropic optical sheet parts 12 of liquid crystal panel be the mode below 60 °, configuration light source side diaphragm 32 and optical sheet parts 12.This deviation angle is preferably below 45 °.When the axle deviation angle is 0 °, prevents that the effect of irregular colour from becoming the highest, but in reality is made, do not damage the interior axle deviation angle of scope of the effect that prevents irregular colour and allowed.
In addition; Consider from the production aspect of common liquid crystal indicator; Preferably; The above-mentioned light incident side polarization plates and the above-mentioned optical sheet parts that constitute above-mentioned liquid crystal indicator are respectively rectangular shape, for the phase deviation angle of the slow axis of the deviation angle of the slow axis of the light source side diaphragm of the above-mentioned light incident side polarization plates on rectangular long limit and above-mentioned optical sheet parts be set in respectively 45 ° with interior, or be set in respectively in 45 ° with respect to the deviation angle of the slow axis of the deviation angle of the slow axis of the light source side diaphragm of the above-mentioned light incident side polarization plates of rectangular minor face and above-mentioned optical sheet parts.Certainly, even under above-mentioned situation, also can be that the mode below 60 ° disposes according to slow axis with respect to the slow axis of the light source side diaphragm of light incident side polarization plates, optical sheet parts.
Below, liquid crystal indicator of the present invention is explained in more detail.
< light incident side polarization plates >
Used light incident side polarization plates possesses the optically anisotropic light source side diaphragm that has that comprises polarizing coating that polyvinyl alcohol resin forms and the one side (becoming the face of backlight side in the liquid crystal indicator) that is configured in this polarizing coating among the present invention.
In addition, used light incident side polarization plates can also possess the cell side diaphragm or the optical compensation films of the liquid crystal cell side (with the face of the face opposition side that disposes above-mentioned light source side diaphragm) that is configured in polarizing coating among the present invention.
Wherein, in the present invention, only be preferably one side (backlight side) applying light source side diaphragm at polarizing coating, in directly the fit form of optical compensation films of the another side of polarizing coating.Consider it is favourable from the slim light-weighted viewpoint of polarization plates, and can reduce the component parts quantity of liquid crystal indicator, therefore bring the simplification of production process and the raising of yield rate.
In addition, also can be the diaphragm of fitting on the two sides of polarizing coating (light source side diaphragm and liquid crystal cell side diaphragm), on the liquid crystal cell side diaphragm the further range upon range of formation that optical compensation films is arranged.At this moment, the liquid crystal cell side diaphragm that is layered in the liquid crystal cell side (optical compensation films side) of polarizing coating adopts the little film of optical anisotropy usually.
(polarizing coating)
Used polarizing coating for example utilizes known method to make through following operation among the present invention: the operation of the polyvinyl alcohol resin film being carried out uniaxial tension; Through the polyvinyl alcohol resin film being dyeed, make the operation of its absorption dichromatism pigment with the dichromatism pigment; With boric acid aqueous solution the polyvinyl alcohol resin film that is adsorbed with the dichromatism pigment is carried out treatment procedures; And the operation of after handling, washing with boric acid aqueous solution.
As polyvinyl alcohol resin, can use with polyvinyl acetate (PVA) be the resin saponification and resin.As polyvinyl acetate (PVA) is resin, except the homopolymer of vinyl acetate is the polyvinyl acetate (PVA), can also enumerate vinyl acetate with can be with the multipolymer of other monomer of its copolymerization etc.As can with other vinyl acetate copolymerized monomer, for example can enumerate unsaturated carboxylic acid class, olefines, vinyl ethers, unsaturated sulfonic acid class and have acrylic amide of ammonium etc.
The saponification degree of polyvinyl alcohol resin is generally about 85～100 moles of %, is preferably 98 moles more than the %.This polyvinyl alcohol resin can be modified, and for example, also can use with aldehydes modified polyethylene alcohol formal and polyvinyl acetal etc.In addition, the degree of polymerization of polyvinyl alcohol resin is generally 1,000～10, about 000, be preferably about 1,500～5,000.
With such polyvinyl alcohol resin system film and film can be as the raw material film of polarizing coating.With the not special qualification of the method for polyvinyl alcohol resin system film, can be with known method system film.The thickness of polyethenol series raw material film is not special to be limited, but for example is about 10 μ m～150 μ m.
The uniaxial tension of polyvinyl alcohol resin film can carry out before the dyeing of dichromatism pigment, also can carry out simultaneously with dyeing, perhaps after dyeing, carries out.When after dyeing, carrying out uniaxial tension, this uniaxial tension can carry out before boric acid is handled or in the boric acid processing procedure.In addition, also can in these a plurality of stages, carry out uniaxial tension.
When carrying out uniaxial tension, can between the different roller of peripheral speed, carry out uniaxial tension, also can use hot-rolling to carry out uniaxial tension.In addition, uniaxial tension can be the dry type stretching that in atmosphere, carries out, and also can be using solvent, the wet type that stretches under the state of polyvinyl alcohol resin film swelling is stretched.Stretching ratio is generally about 3～8 times.
As with the method for dichromatism pigment, for example can adopt the method for polyvinyl alcohol resin film immersion in the WS that contains the dichromatism pigment with the dyeing of polyvinyl alcohol resin film.As the dichromatism pigment, specifically can use iodine or dichroic dye.In addition, the polyvinyl alcohol resin film was preferably implemented dip treating earlier before dyeing is handled.
When using iodine, can be employed in the WS that contains iodine and potassium iodide the method that dipping polyvinyl alcohol resin film dyes usually as the dichromatism pigment.Content of iodine in this WS per 100 weight parts waters usually is about 0.01～1 weight portion.In addition, common per 100 weight parts waters of the content of potassium iodide are about 0.5～20 weight portion.The temperature of the WS that uses in the dyeing is generally about 20～40 ℃.
In addition, the dip time in this WS (dyeing time) was generally about 20～1,800 seconds.
On the other hand, when using dichroic dye, usually, can adopt the method that the polyvinyl alcohol resin film immersion is dyeed in containing the WS of water-soluble dichroic dye as the dichromatism pigment.The content of the dichroic dye in this WS per 100 weight parts waters usually is 1 * 10 -4About～10 weight portions, be preferably 1 * 10 -3About～1 weight portion.This WS can contain inorganic salts such as sodium sulphate as dyeing assistant.The temperature of the dichroic dye WS that uses in the dyeing is generally about 20～80 ℃.In addition, the dip time in this WS (dyeing time) was generally about 10～1,800 seconds.
Utilize the boric acid processing after the dichromatism pigment dyes to carry out in containing the WS of boric acid through the polyvinyl alcohol resin film immersion after will dyeing usually.
The amount that contains the boric acid in the WS of boric acid per 100 weight parts waters usually is about 2～15 weight portions, is preferably 5～12 weight portions.When using iodine as the dichromatism pigment, this WS boric acid that contains boric acid preferably contains potassium iodide.The amount that contains the potassium iodide in the WS of boric acid per 100 weight parts waters usually is about 0.1～15 weight portion, is preferably about 5～12 weight portions.Dip time in containing the WS of boric acid is generally 60～1, about 200 seconds, is preferably about 150～600 seconds, more preferably about 200～400 seconds.The temperature that contains the WS of boric acid is generally more than 50 ℃, is preferably 50～85 ℃, more preferably 60～80 ℃.
Polyvinyl alcohol resin film after boric acid is handled is washed processing usually.Washing is handled for example can be through carrying out borated polyvinyl alcohol resin film immersion in water.The temperature of the water when washing is handled is generally about 5～40 ℃.In addition, dip time was generally about 1～120 second.
Dried is implemented in the washing back, obtains polarizing coating.Dried can use air drier or far infra-red heater to carry out.The temperature of dried is generally about 30～100 ℃, is preferably 50～80 ℃.The dried time was generally about 60～600 seconds, was preferably 120～600 seconds.
Through dried, can the moisture rate of polarizing coating be reduced to the degree of practical application.This moisture rate is generally 5～20 weight %, is preferably 8～15 weight %.If moisture rate is lower than 5 weight %, then the polarizing coating forfeiture is flexible, the situation that exists polarizing coating after above-mentioned drying, to damage or break.In addition, if moisture rate is higher than 20 weight %, then there is the situation of the poor heat stability of polarizing coating.
The thickness of the polarizing coating that obtains so usually can be for about 5～40 μ m.
(having optically anisotropic light source side diaphragm)
For the optically anisotropic light source side diaphragm of having of the one side that is layered in polarizing coating, can use transparent various resin moldings.As the transparent resin material that constitutes transparent resin film, for example can enumerate acetate fiber prime system resins such as diacetyl cellulose, triacetyl cellulose; Annular ethylene series resin and other polyolefin resines such as norbornene resin; And acrylic resin etc.Wherein, from the cost aspect or easily the such advantage of filmization is considered, preferably uses pet resin.
The effect that prevents irregular colour of the present invention is when the light source side diaphragm has high optical anisotropy, particularly phase difference value is that 200nm becomes remarkable when above in face.For example, even when use has high optically anisotropic stretching polyethylene terephthalate film, also can obtain significant effect.
Stretching polyethylene terephthalate film is the above monadic stretching membrane of one deck, its through melt extrude with more than one PET series resin system film, carry out cross directional stretch again and form; The perhaps above biaxially-stretched film of one deck, it is through carrying out longitudinal stretching in system film continued, then carrying out cross directional stretch and form.Anisotropy that polyethylene terephthalate can be controlled refractive index arbitrarily through stretching and the various optics physics values that determine by their (phase difference value, Nz value etc. in slow axis, the face).
The PET series resin is meant, the above resin that is made up of ethylene glycol terephthalate of 80 moles of % of repetitive can contain other dicarboxylic acid composition and diol component.Do not limit as other dicarboxylic acid composition is special; But for example can enumerate m-phthalic acid, right-β-oxygen base oxethyl benzoic acid, 4; 4 '-dicarboxylate biphenyl, 4,4 '-benzophenonedicarboxylic acid, two (4-carboxyl phenyl) ethane, hexane diacid, certain herbaceous plants with big flowers diacid and 1,4-dicarboxyl cyclohexane etc.
Diol component as other does not limit especially, but can enumerate ethylene oxide adduct, polyglycol, polypropylene glycol and the polytetramethylene glycol etc. of propylene glycol, butylene glycol, neopentyl glycol, diethylene glycol, cyclohexanediol, bisphenol-A.
These other dicarboxylic acid composition or other diol component can use combination more than 2 kinds as required.In addition, also can and with hydroxycarboxylic acids such as P-hydroxybenzoic acid.In addition, as other copolymer composition, can use the dicarboxylic acid composition or the diol component that contain a spot of amido link, amino-formate bond, ehter bond and carbonic acid ester bond etc.
As the manufacturing approach of PET series resin, can adopt following method: the method etc. that makes terephthalic acid (TPA) and monoethylene glycol (and other dicarboxylic acid or other glycol as required) method of direct polycondensation, the dialkyl that makes terephthalic acid (TPA) and monoethylene glycol (and other dialkyl or other glycol of dicarboxylic acid as required) carry out the method for ester exchange reaction aftercondensated and make glycol ester (and other diol ester as required) polycondensation of terephthalic acid (TPA) (and other dicarboxylic acid as required).
In each polyreaction, can use the polymerization catalyst that comprises antimony system, titanium system, germanium system or aluminium based compound, or comprise the polymerization catalyst of above-mentioned complex chemical compound.
This polymeric reaction condition can suitably be selected according to employed monomer, catalyzer, reaction unit and target resin rerum natura; Have no particular limits; But for example temperature of reaction is generally about 150 ℃～about 300 ℃, is preferably about 200 ℃～about 300 ℃, more preferably about 260 ℃～about 300 ℃.In addition, its pressure is generally atmospheric pressure～about 2.7Pa, and wherein the rear half stage of preferred reaction is at depressurised side.
Polyreaction is through stirring so that elimination reaction thing devolatilizations such as glycol, alkylate or water are carried out under the high reduced pressure of such high temperature.
In addition, polyplant can be merely a reactive tank, perhaps can connect a plurality of reactive tanks.Under this situation, common difference according to the degree of polymerization is Yi Bian polymerization is carried, carried out to reactant on one side between reactive tank.In addition, in the rear half stage of polymerization, can also adopt the method that possesses the horizontal reacting device, when adding hot milling, carries out devolatilization.
For the resin after the finishing polymerization; After taking out from reactive tank or horizontal reacting device with molten condition, obtain with the form of cooling off the sheet after the pulverizing with drum cooler or salband etc. or with the granular form of severing after importing extruder and being extruded into the cord shape.
And then, can also carry out solid phase as required, improve molecular weight, or reduce low molecular weight compositions.As the low molecular weight compositions that in the PET series resin, can contain, can enumerate the cyclic trimer composition, the such content of cyclic trimer composition in resin is preferably below the 5000ppm, more preferably below the 3000ppm.If the cyclic trimer composition surpasses 5000ppm, then sometimes the rerum natura of the optics of film is produced harmful effect.
For the molecular weight of PET series resin; With with resin dissolves in the mixed solvent of phenol/tetrachloroethane=50/50 (weight ratio), when the limiting viscosity of 30 ℃ of mensuration is represented; Be generally 0.45～1.0dL/g; Be preferably 0.50～1.0dL/g, more preferably the scope of 0.52～0.80dL/g.The situation that throughput rate reduction when there is the manufacturing film in the PET series resin of the not enough 0.45dL/g of limiting viscosity or the physical strength of film descend.The situation that melt extrudes poor stability of polymkeric substance when in addition, limiting viscosity is made film above the PET series resin existence of 1.0dL/g.
In addition, the PET series resin can contain adjuvant as required.As adjuvant, for example can enumerate lubricant, anti blocking agent, thermal stabilizer, anti-oxidant, antistatic agent, photostabilizer and resistance to impact modifying agent etc.Its addition preferably sets produces in the dysgenic scope for the optics rerum natura.
In order to cooperate such adjuvant, and for after the film stated be shaped, the PET series resin uses with the graininess through extruder granulation gained usually.The size and the shape of particle have no particular limits, and are generally height and diameter and are following cylindric, spherical or flat spherical of 5mm.
Thereby the PET series resin that obtains like this can be membranaceous through being configured as, carry out the high polyethylene terephthalate film of physical strength that stretch processing forms transparent and homogeneous.Do not limit as this manufacturing approach is special, but for example can adopt the following method of putting down in writing.
At first, the pellet supply that contains pet resin of drying in melt extrusion apparatus, is heated to the above and fusion of fusing point.Then, the resin of fusion is extruded from mould, on the rotation drum cooler, carried out quenching and solidify,, obtain being essentially the unstretching film of noncrystalline state to reach the temperature below the glass transition temperature.This melt temperature is to decide according to the fusing point of employed PET series resin and extruder, and it has no particular limits, and is generally 250～350 ℃.
In addition,, preferably improve the adaptation of film and rotation drum cooler, preferably adopt static to apply driving fit method or liquid coating driving fit method in order to improve the planarity of film.
Static applies the driving fit method and is generally such method: establish wire electrode through opening along the direction that flows to quadrature of film at the upper face side of film; And this electrode applied the DC voltage of about 5～10kV; Thereby give the film static charge, improve the adaptation of rotation drum cooler and film.In addition, liquid coating driving fit method is such method: on the whole surface or part surface (part that for example only contacts) that liquid are coated on equably the rotation drum cooler with the film both ends, thus the adaptation of raising rotation drum cooler and film.Can be as required also with above-mentioned two kinds of methods.
Used PET series resin can mix the resin structure more than 2 kinds as required or form different resins.For example can enumerate: the particle that will be combined with particulate filler, ultraviolet light absorber or antistatic agent etc. as anti blocking agent mixes use etc. with the particle that does not cooperate.
The range upon range of number of the film of extruding in addition, can be made as more than 2 layers as required.For example can enumerate: prepare to be combined with particle and the particle that does not cooperate, be supplied to identical mould from different extruders as the particulate filler of anti blocking agent, thereby extrude " cooperation filler/not cooperation/cooperation filler " by 2 kinds of 3 layers of films that constitutes etc.
When obtaining monadic stretching membrane, above-mentioned unstretching film utilizes stenter to carry out cross directional stretch to the Width (with respect to the vertical direction of length direction) of film usually under the temperature more than the glass transition temperature.This draft temperature is generally 70～150 ℃, is preferably 80～130 ℃, more preferably 90～120 ℃.In addition, stretching ratio is generally 2.5～6 times, is preferably 3～5.5 times.If 1.1 times of the stretching ratio less thaies during cross directional stretch, then the transparency of film becomes bad sometimes.In addition, the stretching ratio above 6 times is unpractical on industrial manufacturing technology.
, can heat-treat, and can carry out relaxation as required and handle thereafter.Heat treatment temperature is generally 150～250 ℃, is preferably 180～245 ℃, more preferably 200～230 ℃.Heat treatment time was generally for 1～600 second, was preferably for 1～300 second, more preferably 1～60 second.
The relaxation treatment temperature is generally 100～230 ℃, is preferably 110～210 ℃, more preferably 120～180 ℃.In addition, the relaxation amount is generally 0.1～20%, is preferably 1～10%, and more preferably 2～5%.For this relaxation treatment temperature and relaxation amount, the polyethylene terephthalate film after further preferably handling according to relaxation is mode 2% below the temperature when setting relaxation amount and relaxation processing at 150 ℃ percent thermal shrinkage.
On the other hand, when obtaining biaxially-stretched film, above-mentioned unstretching film at first carries out longitudinal stretching to extruding direction usually under the temperature more than the glass transition temperature.Draft temperature is generally 70～150 ℃ of In, is preferably 80～130 ℃, more preferably 90～120 ℃.In addition, stretching ratio is generally 1.1～6 times, is preferably 2～5.5 times.If 1.1 times of this stretching ratio less thaies then have the not enough tendency of physical strength of stretching polyethylene terephthalate film.In addition, if surpass 6 times, then there is the situation of horizontal intensity deficiency in practicality.This stretching can disposablely be accomplished, and also can carry out several times as required.Usually, when repeatedly stretching, amount to stretching ratio and be preferably above-mentioned scope.
Thereafter, the longitudinal stretching film that obtains like this can be heat-treated.Then, can carry out relaxation as required handles.This heat treatment temperature is generally 150～250 ℃, is preferably 180～245 ℃, more preferably 200～230 ℃.In addition, heat treatment time was generally for 1～600 second, was preferably for 1～300 second, more preferably 1～60 second.
The relaxation treatment temperature is generally 90～200 ℃, is preferably 120～180 ℃.In addition, the relaxation amount is generally 0.1～20%, is preferably 2～5%.
For this relaxation treatment temperature and relaxation amount, the polyethylene terephthalate film after further preferably handling according to relaxation is mode 2% below the temperature when setting relaxation amount and relaxation processing at 150 ℃ percent thermal shrinkage.
When obtaining biaxially-stretched film, handle the back, or heat-treat as required or after relaxation handles, utilize stenter to carry out cross directional stretch at longitudinal stretching usually.This draft temperature is generally 70～150 ℃, is preferably 80～130 ℃, more preferably 90～120 ℃.In addition, stretching ratio is generally 1.1～6 times, is preferably 2～5.5 times.
If 1.1 times of the stretching ratio less thaies during cross directional stretch then exist the film strength of utilizing orientation to improve not enough situation.In addition, the stretching ratio above 6 times is unpractical on industrial manufacturing technology.
, can heat-treat, and can carry out relaxation as required and handle thereafter.Heat treatment temperature is generally 150～250 ℃, is preferably 180～245 ℃, more preferably 200～230 ℃.Heat treatment time was generally for 1～600 second, was preferably for 1～300 second, more preferably 1～60 second.
The relaxation treatment temperature is generally 100～230 ℃, is preferably 110～210 ℃, more preferably 120～180 ℃.In addition, the relaxation amount is generally 0.1～20%, is preferably 1～10%, and more preferably 2～5%.For this relaxation treatment temperature and relaxation amount, the polyethylene terephthalate film after further preferably handling according to relaxation is mode 2% below the temperature when setting relaxation amount and relaxation processing at 150 ℃ percent thermal shrinkage.
When obtaining uniaxial tension and biaxially-stretched film, handle the back, or heat-treat as required or after relaxation handles, utilize stenter to carry out cross directional stretch at longitudinal stretching usually.This draft temperature is generally 70～150 ℃, is preferably 80～130 ℃, more preferably 90～120 ℃.In addition, stretching ratio is generally 1.1～6 times, is preferably 2～5.5 times.If 1.1 times of the stretching ratio less thaies during cross directional stretch then exist the film strength of utilizing orientation to improve not enough situation.In addition, the stretching ratio above 6 times is unpractical on industrial manufacturing technology.
, can heat-treat, and can carry out relaxation as required and handle thereafter.Heat treatment temperature is generally 150～250 ℃, is preferably 180～245 ℃, more preferably 200～230 ℃.Heat treatment time was generally for 1～600 second, was preferably for 1～300 second, more preferably 1～60 second.
The relaxation treatment temperature is generally 100～230 ℃, is preferably 110～210 ℃, more preferably 120～180 ℃.In addition, the relaxation amount is generally 0.1～20%, is preferably 1～10%, and more preferably 2～5%.For this relaxation treatment temperature and relaxation amount, the polyethylene terephthalate film after further preferably handling according to relaxation is mode 2% below the temperature when setting relaxation amount and relaxation processing at 150 ℃ percent thermal shrinkage.
In uniaxial tension and biaxial stretch-formed processing, if this stretch processing temperature all above 250 ℃, then resin produces heat ageing or excessive crystallizationization, therefore optical property descends sometimes.In addition, if 70 ℃ of stretch processing temperature less thaies, then existing stretches expends that excessive stress or film solidify and the situation that can not stretch.
In addition, in uniaxial tension and biaxial stretch-formed processing, behind cross directional stretch,, can heat-treat, perhaps carry out stretch processing once more in order to relax to be bent into the deflection with respect to the draw direction that is orientated main shaft of representative.
Need to prove that at this, draw direction is meant the big direction of stretching ratio when longitudinal stretching or cross directional stretch.In polyethylene terephthalate film biaxial stretch-formed, the cross directional stretch multiplying power is slightly larger than the longitudinal stretching multiplying power usually, and therefore in this case, draw direction is meant the vertical direction with respect to the length direction of film.In addition, in uniaxial tension, usually, because as stated along cross directional stretch, therefore in this case, draw direction is meant the vertical direction with respect to the length direction of film equally.
In addition, at this, the orientation main shaft is meant the molecular orientation direction in the arbitrfary point on the stretching polyethylene terephthalate film, is meant slow axis.Be meant the differential seat angle of slow axis and draw direction with respect to the deflection of the draw direction of this slow axis.
Above-mentioned slow axis for example can use phase retardation film optical material testing fixture RETS Dispute Resolution Mechanism of NAFTA Chapter Eleven Otsuka Electronics Co., Ltd. system) or molecular orientation meter MOA (prince's instrumentation machine Co., Ltd. system) etc. measure.
In stretching polyethylene terephthalate film, the refractive index n of the slow-axis direction in the control face x, in face with the refractive index n of the direction of slow axis quadrature y, thickness direction refractive index n zThe time, the stretching ratio when above-mentioned longitudinal stretching or cross directional stretch is the most important factor, in the making of stretching polyethylene terephthalate film, uniaxial tension is fit to make with (n usually x-n z)/(n x-n y) expression the less film of Nz coefficient, the bigger film of biaxial stretch-formed suitable making Nz coefficient.
In the used in the present invention polarization plates, as said stretching polyethylene terephthalate film, being preferably the Nz coefficient is more than 4 or the film of less than 2.The Nz coefficient is that the stretching polyethylene terephthalate film more than 4 can preferably be made through biaxial stretch-formed, and the stretching polyethylene terephthalate film of Nz coefficient less than 2 can preferably be made through uniaxial tension.Through adopting the stretching polyethylene terephthalate film of such optical property, can reduce the irregular colour of the liquid crystal indicator that said polarization plates is installed to a certain extent.At the Nz coefficient is that 4 these values when above can be brought into play the effect that reduces irregular colour more greatly more, is being lower than the 2 o'clock more little effects that can bring into play the minimizing irregular colour more of this value.At the Nz coefficient is more than 2 during to less than 4, and the tendency that the liquid crystal indicator of said polarization plates has irregular colour to become stronger is installed.
In the used in the present invention polarization plates, can select arbitrarily according to the restriction of purpose or production aspect with respect to the axle deviation angle of the slow axis axis of homology, the stretching polyethylene terephthalate of polarizing coating.For example; With polarization plates of the present invention during as backlight side (light incident side) polarization plates of the liquid crystal indicator that possesses the strong backlight light source of the polarizability of frontal; For prevent to produce phase differential in the face that comes from stretching polyethylene terephthalate film, from the interference color of frontal, a deviation angle of preferred polarizing coating and stretching polyethylene terephthalate film is less.Preferably with respect to the deviation angle of the slow axis axis of homology, stretching polyethylene terephthalate film of polarizing coating at 0 degree above and 15 scopes below spending.In this case, with the Nz coefficient settings be more than 4 or less than 2 also reduce aspect the irregular colour effective.
As the strong backlight light source of polarizability, for example can enumerate light source that in backlight unit, possesses the reflective polarizing diffusion barrier etc.The reflective polarizing diffusion barrier is meant the film with following function: through backlight optionally being reflected, utilizing the brightness that can improve visible range again.As the commercially available prod that is equivalent to the reflective polarizing diffusion barrier, " DBEF " (trade name) of being sold by the 3M company (in Japan, Sumitomo 3M (strain)) of the U.S. etc. arranged.
On the other hand, under the situation except that above-mentioned, can preferably use the big material of deviation angle with respect to the slow axis axis of homology, stretching polyethylene terephthalate film of polarizing coating.Wherein, more preferably deviation angle is the above and materials below 50 degree of 20 degree.Axle deviation angle through with polarizing coating and stretching polyethylene terephthalate film is set in the above-mentioned scope, can reduce the irregular colour of liquid crystal indicator more.
In stretching polyethylene terephthalate film of the present invention,, can adopt known any technology ad lib for various optics physics values (phase difference value, Nz coefficient etc. in slow axis, the face) are controlled in the particular range.Stretching conditions such as draft temperature that specifically, can be when regulating above-mentioned stretch processing, stretching ratio, relaxation processing, linear speed are controlled.In addition, in stretching polyethylene terephthalate pleurodiaphragmatic in terspace material film, in Width (with respect to the vertical direction of length direction), the deviation of phase difference value, Nz coefficient in the deflection, face with the slow axis that is bent into representative usually appears.For such stretching polyethylene terephthalate film, can only optionally use width range as required with objective optics performance.
Method as a deviation angle of the slow axis of the axis of homology of control polarizing coating of used polarization plates among the present invention and stretching polyethylene terephthalate film; Can also enumerate: use in stretching polyethylene terephthalate pleurodiaphragmatic in terspace material film itself, draw direction and slow axis are adjusted to the method for the material in the angle on target scope; Perhaps as stated, only use to selectivity property the method for width range as required with objective optics performance.In addition, when polarizing coating laminated stretching polyethylene terephthalate film, can the deviation angle of the slow-axis direction of the axis of homology direction of polarizing coating and stretching polyethylene terephthalate film be adjusted in the angle on target scope and fit.When adopting former approach, can polarizing coating and stretching polyethylene terephthalate film be fitted with volume to volume, therefore excellent aspect productivity and cost.
The thickness of used stretching polyethylene terephthalate film is preferably in the scope of 15～75 μ m, more preferably in the scope of 20～60 μ m in the polarization plates of the present invention.When the thickness less than 15 μ m of stretching polyethylene terephthalate film, the tendency of (operability is poor) not easy to operate is arranged, in addition, and when thickness surpasses 75 μ m, film thickening and cost uprises, and also the advantage of thin-walled property has the tendency that weakens.
The stretching polyethylene terephthalate film that obtains like this can easily obtain the commercially available prod, for example can enumerate the following commercially available prod of trade name " ダ イ ア ホ イ Le ", " ホ ス タ Off ア Application ", " Off ユ one ジ ヨ Application " (above is Mitsubishi Plastics Inc's system), " テ イ ジ Application テ ト ロ Application Off イ Le system ", " メ リ ネ Star Network ス ", " マ イ ラ one ", " テ Off レ Star Network ス ", (above is film Co., Ltd. of Supreme Being people Du Pont system), " エ ス テ Le Off イ Le system spins in Japan ", " エ ス ペ Star ト Off イ Le system spins in Japan ", " コ ス モ シ ヤ イ Application ", " Network リ ス パ one " (above is Toyo Boseki K.K's system), " Le ミ ラ one " (eastern beautiful film is processed Co., Ltd.'s system), " エ Application Block ロ Application ", " エ Application Block レ Star ト " (UNITIKA Co., Ltd. system), " ス カ イ ロ one Le " (SKC corporate system), " コ one Off イ Le " (Co., Ltd.'s high system of closing), " Easthome's polyester film " (STC Corp.'s system) and " too pavilion polyester film " (FUTAMURA KCC system) etc.
And then, as long as do not hinder effect of the present invention, the range upon range of various functional layers of single or double on the stretching polyethylene terephthalate film that just can be used in the present invention.Range upon range of functional layer for example can be enumerated conductive layer, smooth layer, be prone to sliding layer, antiblocking layers and easy adhesive linkage etc.Wherein, this stretching polyethylene terephthalate film is range upon range of across bond layer and polarizing coating, and therefore preferred range upon range of have an easy adhesive linkage.
Constitute the not special qualification of the composition that is prone to adhesive linkage, but be resin or acrylic resin etc. for example for polyester based resin, the carbamate that has polar group and low-molecular-weight and lower glass transition temperatures in the skeleton.In addition, can contain crosslinking chemical, organic or inorganic filler, surfactant and lubricant etc. as required.
On stretching polyethylene terephthalate film, form above-mentioned conductive layer, smooth layer, be prone to not special qualification of method of functional layers such as sliding layer, antiblocking layers and easy adhesive linkage, but for example can adopt following method: the method that forms on the film after all stretching process finish; In the operation that PET series is resin stretched, the method that for example between longitudinal stretching and cross directional stretch operation, forms; And before bonding or the method that forms of bonding back etc. with polarizing coating.For example, in biaxial stretch-formed stretching polyethylene terephthalate film, consider, preferably be employed in the method for the PET series resin being carried out forming, then carrying out behind the longitudinal stretching cross directional stretch from productive viewpoint.
(light source side diaphragm bonding)
In the used in the present invention light incident side polarization plates, polarizing coating with have optically anisotropic light source side diaphragm and paste by bonding agent usually.As this bonding agent, can consider and the cementability of film separately, use the bonding agent arbitrarily in the various known bonding agents etc.Transparent and the optically isotropic bonding agent of preferred use.As concrete bonding agent, for example can enumerate polyethenol series bonding agent, acrylic acid series bonding agent, carbamate is that bonding agent, epoxy are bonding agent etc.As epoxy is the preference of bonding agent, can enumerate the activation evergy line solidification compound that contains the alicyclic epoxy compound.
In addition, preferably use the no-solvent type bonding agent.Through adopting said bonding agent, can improve the permanance of the polarization plates under harsh environment, and not need the operation of dry bonding agent, therefore have the such advantage of the productivity of raising.
(cell side diaphragm or optical compensation films)
Light incident side polarization plates used among the present invention can have cell side diaphragm or optical compensation films, and said cell side protective film is stacked on the face with the opposition side of the range upon range of face that the above-mentioned optically anisotropic light source side diaphragm of having of polarizing coating arranged.
Cell side diaphragm or optical compensation films can suitably use according to purpose has the film as the optical characteristics of blooming; Not special the qualification; But, for example can use the film that constitutes by following film: the transparent resin films such as cellulose-based resin molding, ethylene series resin molding, acrylic resin film, polycarbonate resin film and polyester based resin film that comprise triacetyl cellulose (TAC) etc. as the cell side diaphragm.
As optical compensation films, specifically can enumerate above-mentioned transparent resin film is stretched so that it has the anisotropic film of refractive index, is combined with the film etc. that optical anisotropy is given the film of adjuvant and formed optical anisotropic layer from the teeth outwards.
In the light incident side polarization, in that the liquid crystal cell side of polarizing coating is range upon range of when the cell side diaphragm is arranged, can be further at the range upon range of optical compensation films of this liquid crystal cell side.
In addition, of the back on these cell side diaphragms or optical compensation films, can further range upon range of optical functional film, or be coated with optical functional layer.
Cellulose-based resin molding is the film that comprises cellulosic partially or completely carboxylate, for example can enumerate the film that comprises cellulosic acetate, propionic ester, butyric ester and their mixed ester etc.Wherein, preferably use tri acetyl cellulose membrane, diacetyl cellulose film, cellulose ethanoate propionic ester film and cellulose acetate butyrate film etc.
Cellulose-based resin molding like this can obtain the commercially available prod easily, for example can enumerate the following commercially available prod of trade name: " FUJITAC TD " (Fuji Photo Film Co., Ltd.'s system) and " コ ニ カ ミ ノ Le タ TAC Off イ Le system KC " (Konica Minolta Opto Co., Ltd. system) etc.
The ethylene series resin molding is for example for comprising the film of resin, and said resin is to use catalyst for polymerization that chain olefinic monomer such as ethene and propylene and ENB and other cyclic olefin monomers such as cyclopentadiene derivant are carried out polymerization and obtains.
As the ethylene series resin that comprises the chain olefinic monomer, can enumerate tygon or polypropylene-based resin.Wherein, the polypropylene-based resin that preferably comprises the homopolymer of propylene.In addition, be main body preferably also with the propylene, make can with the comonomer of its copolymerization with the ratio of the ratio of common 1～20 weight %, preferred 3～10 weight %, carry out copolymerization and polypropylene-based resin
Comprise in use under the situation of polypropylene-based resin of propylene copolymer, as can with the comonomer of copolymerization of propylene, be preferably ethene, 1-butylene and 1-hexene.Wherein, from the transparency and the more excellent aspect of stretch process property, the material that preferably ethylene copolymer is formed with the ratio of 3～10 weight %.Be set at more than the 1 weight % through copolymerization ratio, can demonstrate the effect that improves the transparency or stretch process property ethene.On the other hand, if this ratio surpasses 20 weight %, then the fusing point of resin descends and infringement cell side diaphragm or the desired thermotolerance of optical compensation films sometimes.
Such polypropylene-based resin can easily obtain the commercially available prod, for example can enumerate the following commercially available prod of trade name: " プ ラ イ system Port リ プ ロ " (the Prime Polymer of Co., Ltd. system), " ノ バ テ Star Network ", " ウ イ Application テ Star Network " (above be Japanese Polypropylene Co., Ltd. system), " Sumitomo ノ one Block レ Application " (Sumitomo Chemical Co's system) and " SunAllomer " (SunAllomer Co., Ltd. system) etc.
With the cyclic olefin polymerization and the ethylene series resin be commonly referred to ring-type (gathering) ethylene series resin, ester ring type (gathering) ethylene series resin or norbornene resin.Be called annular ethylene series resin at this.
As annular ethylene series resin, for example can enumerate: with the ENB or derivatives thereof that is obtained by cyclopentadiene and olefines through Diels-Alder reaction is that monomer carries out the open loop syndiotaxy, then it is carried out hydrogenation and the resin that obtains; To be that monomer carries out the open loop syndiotaxy by the tetracyclododecane or derivatives thereof that bicyclopentadiene and olefines or methacrylic acid acid esters class obtain, then it is carried out hydrogenation and the resin that obtains through Diels-Alder reaction; ENB, tetracyclododecane, their derivatives class or other cyclic olefin monomers are likewise carried out the copolymerization of open loop dystopy, then it is carried out hydrogenation and the resin that obtains; And through addition polymerization make above-mentioned ENB, tetracyclododecane, they derivant and have resin that the copolymerization such as aromatics of vinyl obtain etc.
Such annular ethylene series resin can easily obtain the commercially available prod, for example can enumerate the following commercially available prod of trade name: " ト パ ス " (Topas Advanced Polymers GmbH system), " ア one ト Application " (JSR Corp.'s system), " ゼ オ ノ ア ", " ゼ オ ネ Star Network ス " (above be Japanese ZEON Co., Ltd. system) and " ア ペ Le " (Mitsui Chemicals, Inc's system) etc.
As the preferred concrete example of acrylic resin film, can enumerate by methyl methacrylate is the film that resin forms.Methyl methacrylate is that resin is the polymkeric substance that contains the above methyl methacrylate units of 50 weight %.The content of methyl methacrylate units is preferably more than the 70 weight %, also can be 100 weight %.Methyl methacrylate units is that the polymkeric substance of 100 weight % is the imperplex that the methyl methacrylate homopolymerization is obtained.
This methyl methacrylate is that resin usually can be through at radical polymerization initiator and under the coexistence of the chain-transferring agent that uses as required, and making with the methyl methacrylate is that the monofunctional monomer of major component and the polyfunctional monomer polymerization used as required obtain.
As can with the monofunctional monomer of methyl methacrylate copolymer; Not special the qualification, but for example can enumerate the methyl acrylic ester beyond the methyl methacrylates such as Jia Jibingxisuanyizhi, butyl methacrylate, cyclohexyl methacrylate, phenyl methacrylate, benzyl methacrylate, methacrylic acid 2-Octyl Nitrite and 2-hydroxyethyl methacrylate; Esters of acrylic acids such as acryllic acid methyl esters, ethyl acrylate, butyl acrylate, cyclohexyl acrylate, phenyl acrylate, benzyl acrylate, 2-EHA and acrylic acid 2-hydroxy methacrylate; Hydroxy acrylate classes such as 2-(methylol) methyl acrylate, 3-(hydroxyethyl) methyl acrylate, 2-(methylol) ethyl acrylate and 2-(methylol) butyl acrylate; Unsaturated acids such as methacrylic acid and acrylic acid; Halogenated styrenes such as chlorostyrene and bromstyrol class; Substituted phenylethylene such as vinyltoluene and AMS class; Unsaturated nitrile such as vinyl cyanide and methacrylonitrile; Unsaturated acid anhydride such as maleic anhydride and citraconic anhydride class; And unsaturated acid imides such as phenyl maleimide and cyclohexyl maleimide etc.These monomers can be distinguished independent use, also can use with other combination more than a kind.
As can with the polyfunctional monomer of methyl methacrylate copolymer; Not special the qualification, but for example can enumerate the monomer that usefulness acrylic or methacrylic acid such as ethylene glycol bisthioglycolate (methyl) acrylic ester, diethylene glycol two (methyl) acrylic ester, triethylene glycol two (methyl) acrylic ester, TEG two (methyl) acrylic ester, nine ethylene glycol bisthioglycolates (methyl) acrylic ester and ten TEGs (methyl) acrylic ester obtain two terminal hydroxyl esterifications of monoethylene glycol or its oligomer; With acrylic or methacrylic acid with two terminal hydroxyl esters of propylene glycol or its oligomer and the monomer that obtains; Usefulness acrylic or methacrylic acid such as neopentyl glycol two (methyl) acrylic ester, hexanediol two (methyl) acrylic ester and butylene glycol two (methyl) acrylic ester are with the hydroxy esterification of dibasic alcohol and the monomer that obtains; The oxyalkylene addition product of bisphenol-A, bisphenol-A or their halogen are replaced two terminal hydroxyl esterifications of body and the monomer that obtains with acrylic or methacrylic acid; With acrylic or methacrylic acid with polyvalent alcohol esterifications such as trimethylolpropane and pentaerythrites and the monomer that obtains; Reach the monomer that on these terminal hydroxyls, makes the epoxy ring-opening addition of glycidyl acrylate or GMA and obtain; Replace at succinic acid, hexane diacid, terephthalic acid (TPA), phthalic acid, their halogen on dibasic acid such as body and their the oxyalkylene addition product etc., make the epoxy ring-opening addition of glycidyl acrylate or GMA and the monomer that obtains; (methyl) aryl acrylate; And biaryl compound such as divinylbenzene etc.Wherein, preferably use ethylene glycol dimethacrylate, TEG dimethylacrylate and neopentylglycol dimethacrylate.
Methyl methacrylate is that resin can be a resin for the modified methacrylic acid methyl esters through carrying out the reaction modification between the functional group that this resin had also.As this reaction, the interior dehydration condensation of macromolecular chain of the hydroxyl of separating methanol condensation reaction and acrylic acid carboxyl and 2-(methylol) methyl acrylate etc. in the macromolecular chain of the carbomethoxy that for example can enumerate methyl acrylate and the hydroxyl of 2-(methylol) methyl acrylate.
Methyl methacrylate is that resin can easily obtain the commercially available prod, for example can enumerate the following commercially available prod of trade name: " ス ミ ペ Star Network ス " (Sumitomo Chemical Co's system), " ア Network リ ペ Star ト " (Mitsubishi Rayon Co., Ltd's system), " デ Le ペ Star ト " (Asahi Kasei Corporation's system), " パ ラ ペ Star ト " (Kuraray Co., Ltd.'s system) and " ア Network リ PVC ユ ア " (Nippon Shokubai Co., Ltd's system) etc.
The polycarbonate-based resin that constitutes the polycarbonate resin film typically refers to; Utilize interface polycondensation or melt transesterification process; The resin that carbonate precursors such as dihydric phenol photoreactive gas or diphenyl carbonate class is reacted and obtain generally uses the aromatic polycarbonate resin of bisphenol-A as dihydric phenol.In addition, can also enumerate the resin that utilizes the solid phase ester-interchange method to make the polymerization of carbonic ester prepolymer and obtain, or make the cyclic carbonate compound ring-opening polymerization and the resin that obtains etc.
As dihydric phenol, only otherwise infringement does not limit with the performance of transparent resin is just special as optics, but remove bisphenol-A (2,2-pair of (4-hydroxyphenyl) propane) in addition; Can also enumerate for example quinhydrones, resorcinol, 4,4 '-dihydroxybiphenyl, two (4-hydroxyphenyl) methane, two { (4-hydroxyl-3,5-dimethyl) phenyl } methane, 1, two (4-hydroxyphenyl) ethane, 1 of 1-; Two (4-the hydroxyphenyl)-1-diphenylphosphino ethanes, 1 of 1-, two (4-hydroxyphenyl) cyclohexanes, 1 of 1-, two (4-the hydroxyphenyl)-4-isopropyl cyclohexanes, 2 of 1-, two { (4-hydroxy-3-methyl) phenyl } propane, 2 of 2-; Two { (4-hydroxyl-3, the 5-dimethyl) phenyl } propane, 2 of 2-, two { (4-hydroxyl-3, the 5-dibromo) phenyl } propane, 2 of 2-; Two (4-hydroxyphenyl) butane, 2 of 2-, two (4-the hydroxyphenyl)-3-methylbutanes, 2 of 2-, two (4-the hydroxyphenyl)-2-methylbutanes, 2 of 4-, two (4-hydroxyphenyl) pentanes, 2 of 2-; Two (4-the hydroxyphenyl)-4-methylpentanes, 9 of 2-, two (4-hydroxyphenyl) fluorenes, 9 of 9-, two { (4-hydroxy-3-methyl) phenyl } fluorenes, 9 of 9-; Two { (4-hydroxyl-3, the 5-dimethyl) phenyl } fluorenes, 9 of 9-, two { (the 4-hydroxyls-3 of 9-; The 5-dibromo) phenyl } fluorenes, α, α '-two (4-hydroxyphenyl)-adjacent diisopropyl benzene, α, α '-two (4-hydroxyphenyl)-diisopropyl benzene, α; α '-two (4-hydroxyphenyl)-to diisopropyl benzene, 4,4 '-dihydroxybiphenyl sulfone, 4,4 '-dihydroxy diphenylketone and 4; 4 '-dihydroxydiphenyl ether etc., they can distinguish independent use, perhaps can with other mix use more than a kind.
In addition, for molecular-weight adjusting to suitable scope, perhaps with the C-terminal end-blocking of macromolecular chain, also can and use the monohydric phenol compound.As this monohydric phenol, so long as do not limit as the acting compound of end-capping reagent is just special, but for example can enumerate phenol, 4-tert-butyl phenol and 1-phenyl-1-(4-hydroxyphenyl) propane etc.
In addition, as required, also can use with 2-(the 2-hydroxyl-3-tert-butyl group-5-(2-carboxyethyl)) phenyl benzotriazole etc. to have the absorbefacient compound of UV as end-capping reagent.
Polycarbonate-based resin can easily obtain the commercially available prod, for example can enumerate the following commercially available prod of trade name: " レ キ サ Application " (SABIC Inovative plastics corporate system), " マ Network ロ ロ Application ", " ア ペ Star Network " (above is Bayer MaterialScience corporate system), " ユ one ピ ロ Application ", " ノ バ Star Network ス " (above is engineering-plastics Co., Ltd. of Mitsubishi system), " パ Application ラ イ ト " (Teijin Chemicals, Ltd.'s system), " カ リ バ one " (Dow Chemical's system), " SD Port リ カ " (Sumitomo Dow Ltd.'s system) and " タ Off ロ Application " (Idemitsu Kosen Co., Ltd.'s system) etc.
As ethylene series resin, annular ethylene series resin, the methyl methacrylate that will obtain like this is the method that resin and polycarbonate-based resin etc. are configured as the cell side diaphragm, as long as suitably select to be fit to the method for above-mentioned resin, and not special the qualification.For example, can adopt following method: will be dissolved in resin curtain coating in the solvent on metallicity band or drum, dry removing desolvated and obtained the solvent casting method of film; And through resin being heated to it more than melt temperature and carry out mixing and extrude from mould, cooling, thus the extrusion by melting of film obtained.Wherein, consider, preferably adopt extrusion by melting from productive viewpoint.
In addition; Can the commercially available prod can be easily obtained as the film that comprises above-mentioned resin of cell side diaphragm, for example the following commercially available prod of trade name can be enumerated: " FILMAX CPP film " (FILMAX corporate system) as the polypropylene-based resin film; " サ Application ト Star Network ス " (サ Application ト Star Network ス Co., Ltd. system); " ト one セ ロ " (eastern セ ロ Co., Ltd. system); " パ イ レ Application Off イ Le system spins in Japan " (Toyo Boseki K.K's system); " ト レ Off ア Application " (eastern beautiful film is processed Co., Ltd.'s system); " ニ ホ Application Port リ エ one ス " (Japanese Port リ エ one ス Co., Ltd. system); And " too pavilion FC " (Off タ system ラ KCC system) etc.
In addition, for example can enumerate the following commercially available prod of trade name: " ゼ オ ノ ア Off イ Le system " (the オ プ テ ス of Co., Ltd. system) and " ア one ト Application Off イ Le system " (JSR Corp.'s system) etc. as the annular ethylene series resin film.
In addition, for example can enumerate the following commercially available prod of trade name: " ス ミ ペ Star Network ス " (Sumitomo Chemical Co's system), " ア Network リ ラ イ ト ", " ア Network リ プ レ Application " (above be Mitsubishi Rayon Co., Ltd's system), " デ ラ グ ラ ス " (Asahi Kasei Corporation's system), " パ ラ グ ラ ス ", " コ モ グ ラ ス " (above be Kuraray Co., Ltd.'s system) and " ア Network リ PVC ユ ア " (Nippon Shokubai Co., Ltd's system) etc. as the methyl methacrylate resin film.
In addition, for example can enumerate the following commercially available prod of trade name: " レ キ サ Application OQ Off イ Le system " (SABIC Inovative plastics corporate system), " マ Network ロ ホ one Le ", " バ イ ホ one Le " (above is Bayer MaterialScience corporate system), " ユ one ピ ロ Application シ one ト " (engineering-plastics Co., Ltd. of Mitsubishi system) and " パ Application ラ イ ト シ one ト " (Teijin Chemicals, Ltd.'s system) etc. as the polycarbonate resin film.
In addition; As as the range upon range of polyester based resin film that cell side diaphragm with optically anisotropic light source side diaphragm one side opposition side is arranged that is arranged on polarizing coating, can use and constitute polyester based resin (PET series resin) film of the same race that above-mentioned conduct has the stretching polyethylene terephthalate film that optically anisotropic light source side diaphragm enumerates.Under this situation, the polyester based resin film can use the polyester based resin film that does not stretch, and for example can directly use above-mentioned passing through to melt extrude the film that obtains.
Can easily obtain the commercially available prod as the polyester based resin film that does not stretch of cell side diaphragm, for example can enumerate the following commercially available prod of trade name: " ノ バ Network リ ア one " (Mitsubishi chemical Co., Ltd's system) and " Supreme Being people A-PET シ one ト " (Teijin Chemicals, Ltd.'s system) etc.
In addition, as the optical compensation films that comprises cellulose-based resin molding, the refractive index characteristic that conforms with purpose is just not special to be limited as long as have, but for example can enumerate: the above-mentioned cellulose-based resin molding of enumerating is carried out single shaft or biaxial stretch-formed and film that obtain; Perhaps make cellulose-based resin molding etc. contain compound and the film that forms with phase differential regulatory function; Coating has the film of the compound of phase differential regulatory function on cellulose-based surface resin film; And these films are further carried out single shaft or biaxial stretch-formed and film of obtaining etc.
The optical compensation films that comprises cellulose-based resin molding can easily obtain the commercially available prod, for example can enumerate the following commercially available prod of trade name: " FUJITAC WV " (film Co., Ltd. of Fuji system) and " コ ニ カ ミ ノ Le タ TAC Off イ Le system KC8UCR " (コ ニ カ ミ ノ Le タ オ プ ト Co., Ltd. system) etc.
In addition; With above-mentioned ethylene series resin molding, acrylic resin film, polycarbonate resin film and the polyester based resin film of enumerating as the cell side diaphragm etc. during as optical compensation films; Usually, its unstretching film that stretches makes film have the refractive index anisotropy.Drawing process is selected according to needed refractive index anisotropy, and not special the qualification adopted vertical uniaxial tension, horizontal uniaxial tension and vertical, that laterally carry out successively biaxial stretch-formed usually.
Usually, vertically the film of uniaxial tension has n x＞n y=n zThe refractive index anisotropy.At this, n xBe the refractive index of the draw direction of film, n yBe the refractive index of the Width of film, n zRefractive index for the normal direction of film.
In addition; Usually, laterally the film of uniaxial tension has the refractive index anisotropy of
Figure BDA0000153617700000241
.
In addition, usually, carry out biaxial stretch-formed film successively and have n x＞n y＞n zThe refractive index anisotropy.
In addition,, heat-shrinkable film is fitted on the target film, is replaced by stretch process, perhaps film is shunk in order to give desired refractive index characteristic.Usually, this operation is to be n in order to obtain the refractive index anisotropy x＞n z＞n yOr n z＞n x>=n yOptical compensation films carry out.
For these optical compensation films, when thickness setting is d, phase difference value R in the face 0Can be expressed as (n x-n y) * d, the phase difference value value R of thickness direction ThCan be expressed as [(n x+ n y)/2-n z] * d.
Optical compensation films can easily obtain the commercially available prod; For example; As the optical compensation films that becomes by cyclic polyolefin hydrocarbon system resin-shaped, for example can enumerate the following commercially available prod of trade name: " ゼ オ ノ ア Off イ Le system " (the オ プ テ ス of Co., Ltd. system), " ア one ト Application Off イ Le system " (JSR Corp.'s system), " エ ス シ one Na phasic difference Off イ Le system " (Sekisui Chemical Co., Ltd's system) and " ピ ユ ア エ one ス ER " (Teijin Chemicals, Ltd.'s system) etc.In addition, as the optical compensation films that forms by polycarbonate-based resin, for example can enumerate " ピ ユ ア エ one ス WR " (Teijin Chemicals, Ltd.'s system) etc.
(cell side diaphragm or optical compensation films bonding)
In the used in the present invention light incident side polarization plates, polarizing coating and above-mentioned cell side diaphragm or optical compensation films are pasted through bonding agent usually.As this bonding agent, can consider and the cementability of film separately, use any bonding agent in the various known bonding agents etc.Transparent and the optically isotropic bonding agent of preferred use.As concrete bonding agent, for example can enumerate polyethenol series bonding agent, acrylic acid series bonding agent, carbamate is that bonding agent, epoxy are bonding agent etc.As epoxy is the preference of bonding agent, can enumerate the activation evergy line solidification compound that contains the alicyclic epoxy compound.
In addition, preferably use the no-solvent type bonding agent.Through adopting said bonding agent, can improve the permanance of the polarization plates under harsh environment, and not need the operation of dry bonding agent, therefore do not need drying equipment, and have the such advantage of the productivity of raising.
In addition; As the bonding agent that is used for bonding polarizing coating and cell side diaphragm or optical compensation films; If use and be used for bonding above-mentioned polarizing coating and the identical bonding agent of bonding agent with optically anisotropic light source side diaphragm, then because only need a kind of bonding agent, so operation be easy.And then; Bonding agent at the two is under the situation of activation evergy line solidification compound; When making polarization plates, embark on journey and shine the activation evergy line, can carry out the bonding of the bonding of light source side diaphragm and cell side diaphragm or optical compensation films simultaneously, therefore have the productive advantage of raising.
In addition, can also use the water system bonding agent.As the bonding agent composition that can become this water system bonding agent, for example can enumerate water-soluble cross-linked property epoxy is that resin and carbamate are resin etc.
(adhesive phase)
Used light incident side polarization plates can have adhesive phase at the liquid crystal cell side of cell side diaphragm or optical compensation films (cell side diaphragm or optical compensation films with the range upon range of opposite face of face that polarizing coating is arranged) among the present invention.Such adhesive phase can be used for the applying with liquid crystal cells.
Constitute the bonding agent of adhesive phase as long as satisfy the just not special qualification of the various characteristics that is used for blooming (transparency, permanance, operability etc.) again; To contain glass transition temperature (Tg) be acrylic resin and the acrylic adhesive of crosslinking chemical below 0 ℃ but for example can use, and said acrylic resin makes in the presence of polymerization initiator with (methyl) acrylic ester and is major component, further contains a spot of acrylic monomer composition with (methyl) acrylic monomers of functional group and carry out free radical polymerization and obtain.
At this, can be expressed from the next as (methyl) acrylic ester of the major component of acrylic resin:
CH 2＝C(R 1)COOR 2
In the formula, R 1Expression hydrogen atom or methyl, R 2The alkyl or the aralkyl of expression carbon number 1～14, R 2Hydrogen atom or the hydrogen atom of aralkyl of alkyl can be replaced by the alkoxy of carbon number 1～10.
In addition, (methyl) acrylic monomers that has a functional group is the monomer that contains hydroxyl, carboxyl, amino, epoxy radicals isopolarity functional group and the two keys (being generally (methyl) acryloyl group) of alkene property at molecule.
Concrete example as (methyl) acrylic ester of the major component of acrylic resin can be enumerated for example R 1Be H, R 2Butyl acrylate for normal-butyl; R 1Be H, R 2Be 2-EHA of 2-ethylhexyl etc.In addition, have the concrete example of (methyl) acrylic monomers of functional group, for example, can enumerate (methyl) acrylic acid 2-hydroxyl ethyl ester as (methyl) acrylic monomers with hydroxyl; As (methyl) acrylic monomers, can enumerate acrylic acid etc. with carboxyl.And then, when making this acrylic resin, can also make the monomer copolymerization that has a plurality of (methyl) acryloyl group in a spot of molecule, as its example, can enumerate 1,4-butylene glycol two (methyl) acrylic ester etc.
When making acrylic resin, above-mentioned (methyl) acrylic ester and (methyl) acrylic monomers with functional group can use a kind of respectively, also can and with multiple.In addition; Can also make up multiple (methyl) acrylic ester and the multipolymer with (methyl) acrylic monomers of functional group and be acrylic resin or be to cooperate other acrylic resin in the acrylic resin, for example comprise the homopolymer of (methyl) acrylic monomers or the acrylic resin of multipolymer with functional group at this multipolymer; Form the acrylic resin composition, and with its resinous principle as bonding agent.
The crosslinking chemical that is engaged in the acrylic adhesive can be isocyanate-based compound, epoxy based compound, metal complex based compound, aziridine based compound etc.The isocyanates based compound has 2 isocyanate bases at least in molecule (compound NCO) self, can also use with the form of the adduct of reactions such as itself and polyvalent alcohol, its dipolymer, trimer etc.Concrete example for crosslinking chemical; As the diisocyanate based compound; Can enumerate the trihydroxy propane adduct of hexamethylene diisocyanate, the trihydroxy propane adduct of toluene diisocyanate etc., usually use with the form that is dissolved in the solution in the organic solvent such as ethyl acetate respectively.These crosslinking chemicals can be distinguished independent use, also can make up use more than a kind with other.
The weight-average molecular weight of the acrylic resin that is contained in the acrylic adhesive is generally about 600,000～2,000,000 when converting with the polystyrene standard that uses gel permeation chromatography (GPC), is preferably 800,000～1,800,000.Weight-average molecular weight less than 600,000 o'clock, the situation that exists cohesive or permanance to reduce.In addition, weight-average molecular weight surpasses at 2,000,000 o'clock, exist adhesive phase be cured to required degree above or gluing after the cell side diaphragm that is difficult for peeling off, fits to quilt or the optical compensation films situation of giving unaccommodated stress birefrin.
Aforesaid propylene acid is that resin can obtain acrylic adhesive solution through being dissolved in the organic solvent such as ethyl acetate and further adding crosslinking chemical.In addition, can contain a kind of of silane coupling agent, weather-proof stabilizing agent, bonding agent, plastifier, softening agent, pigment and inorganic filler as required or more than two kinds, can also further contain light diffusing particulates such as organic microballon.
The acrylic adhesive solution coat that will obtain so usually is on stripping film, and 60～120 ℃ of heating about 0.5～10 minute, organic solvent was removed in distillation, formed adhesive phase.
Then, behind applying said units side diaphragm or optical compensation films on this adhesive phase, for example under the atmosphere of 23 ℃ of temperature, humidity 65%, slaking made fully reaction of crosslinking chemical (C) about 5～20 days.
In addition, also can be after forming adhesive phase on the stripping film, the stripping film of further fitting obtains not by the independent sheet material of the adhesive phase of substrate support such as diaphragm.Under this situation, behind the applying stripping film, for example also under the atmosphere of 23 ℃ of temperature, humidity 65%, slaking fully reacted crosslinking chemical about 5～20 days.The independent sheet material of such bonding agent is peeled off one-sided stripping film in the period of necessity and is fitted on cell side diaphragm or the optical compensation films and uses when manufacturing cell's side diaphragm or optical compensation films.
The raw material of above-mentioned acrylic adhesive can easily obtain the commercially available prod; For example can enumerate various acrylic monomerss (Nippon Shokubai Co., Ltd's system, Toagosei Co., Ltd's system), as 2 of polymerization initiator, 2 '-azoisobutyronitrile etc.! the Japan Finechem of Da mound science Co., Ltd. system, Co., Ltd. system), as the hexamethylene diisocyanate of crosslinking chemical and trihydroxy propane adduct, toluene diisocyanate and trihydroxy propane adduct thereof etc. (Mitsui Chemical Polyurethane Co., Ltd's system, firmly change バ イ エ Le ウ レ タ Application Co., Ltd. system).
In addition, adhesive sheet also has the commercially available prod, for example can enumerate " Off イ Le system シ one ト is cutd open in ノ Application キ ヤ リ ア adhesion " (リ Application テ Star Network Co., Ltd. system, Nitto Denko Corp's system).
< light emitting side polarization plates >
In liquid crystal indicator of the present invention; The used polarization plates (light emitting side polarization plates 40) of the light emitting side of liquid crystal cells can be known polarization plates in the past, also can for the polarization plates of the identical formation of light incident side polarization plates, promptly with the liquid crystal cells opposition side of polarizing coating on possess polarization plates with optically anisotropic diaphragm.Light emitting side polarization plates 40 is being adopted under the situation of the polarization plates identical with light incident side; Preferably, this polarization plates possesses at least a kind of functional layer in the antiglare layer of being selected from, hard conating, anti-reflection layer and the antistatic layer on the face (with the range upon range of opposite face of face that polarizing coating 41 is arranged) of the light emitting side with optically anisotropic diaphragm 42.Under this situation, the polarization plates (light incident side polarization plates) that is configured in the light incident side of liquid crystal indicator also is the polarization plates of defined among the present invention.
< liquid crystal cells >
Through the polarization plates of above-mentioned band adhesive phase is fitted to the one or both sides of liquid crystal cells across its adhesive phase, can obtain liquid crystal panel.Liquid crystal cells is the parts with following function: for the switch light transmission capacity, between 2 transparency carriers, through applying voltage the state of orientation of liquid crystal is changed packaging liquid crystal; According to the state of orientation that is encapsulated in liquid crystal layer wherein with the state of orientation of the liquid crystal layer when between electrode, applying voltage, the liquid crystal cells of variety of ways such as twisted-nematic (TN) pattern, vertical orientated (VA) pattern, plane conversion (IPS) pattern is for example arranged.In the present invention, can use the liquid crystal cells of widely used various patterns in the common liquid crystal indicator.
The performance of cell side diaphragm or optical compensation films that is layered in the liquid crystal cell side of polarizing coating can suitably select according to the mode of operation or the characteristic of above-mentioned liquid crystal cells.
<backlight >
Liquid crystal indicator of the present invention possesses the backlight of the behind that is configured in liquid crystal panel.This backlight possesses area source at least, be arranged on this area source from liquid crystal panel nearest locational, have optically anisotropic optical sheet parts.In addition, the slow axis of these optical sheet parts is that mode below 60 ° disposes according to the formed angle of the slow axis with optically anisotropic light source side diaphragm with adjacent light incident side polarization plates.Through forming such formation, the caused irregular colour of light source side diaphragm that can significantly reduce in the liquid crystal indicator to be produced.
(area source)
Area source used in the backlight will be for will inject to the light source of front face side (liquid crystal panel side) from the light of light source equably.Area source for example possesses diffuser plate at least and is configured in its light source of (with the liquid crystal panel opposition side) behind; Can evenly spread the area source that injects to the full run-down type of front face side afterwards for make light with diffuser plate from light source; Also can be for possessing LGP at least and being configured in the light source of its side; To temporarily incide from the light of light source in the LGP, light evenly injected to the area source of the side light type of front face side from the liquid crystal panel side surface of LGP.
Above-mentioned diffuser plate and LGP all can be made up of transparent resins such as transparent thermoplastic resin or heat-curing resins; As transparent resin, for example can enumerate plexiglass, copolymer of methyl methacrylatestyrene resin, polystyrene resin, polyolefin resin (comprising cyclic olefin resin) and polycarbonate resin etc.
Diffuser plate is to have the image of covering light source and make from even diffusion of the light of light source to inject to the optics that front face side forms the function of area source.Diffuser plate is configured in (on the light path of light source to liquid crystal panel) between light source and the liquid crystal panel usually.As diffuser plate, be fit to the material that use dispersion in above-mentioned transparent resin has the light diffusing agent of the refractive index different with it.As light diffusing agent, can use conduct and transparent resin non-compatibility particle, be generally 0.01～0.3 with the refringence of transparent resin, be preferably 0.05～0.2, weight average particle diameter is generally 1～15 μ m, be preferably the particle of 2～10 μ m.The concrete example of light diffusing agent can be enumerated for example inorganic particulates such as beaded glass, silicon dioxide granule, aluminum hydroxide particles, calcium carbonate particle, barium carbonate particle, Titanium particles, talcum; Organic fillers such as styrene resin particle, acryl resin particle, organosilicon particle etc.
The content of the light diffusing agent in the diffuser plate is according to the difference that requires characteristic of the diffuser plate in the liquid crystal indicator that uses and difference; But can be for for example with respect to transparent resin 100 weight portions; This content is about 0.1～10 weight portion, is preferably 0.3～7 weight portion.The light diffusing agent content of diffuser plate per unit area is preferably 2～200g/m 2, 3～70g/m more preferably 2
LGP is an optics used in the backlight of side light type, has self-configuring in the future and converts the luminous function of face at the light of the light source of its side.LGP can be processed tabular or the chock shaped member that comprises above-mentioned transparent resin.In transparent resin, can contain various adjuvants such as antistatic agent, fire retardant, ultraviolet light absorber, anti-oxidant.In addition, on rear side (with the liquid crystal panel opposition side) surface of LGP, can design the dot pattern that utilizes Chinese white.
As light source used in the area source, for example can adopt the cold-cathode fluorescence lamp (CCFL) that uses fluorescent tube and send white light or light emitting diode (Light Emitting Diode:LED) etc.
(having optically anisotropic optical sheet parts)
Used backlight has optically anisotropic optical sheet parts on the nearest surface of liquid crystal panel, possessing at least among the present invention.Among the present invention, the slow axis of these optical sheet parts disposes according to the mode that the slow axis with optically anisotropic light source side diaphragm with respect to the light incident side polarization plates of institute's adjacency forms below 60 °.
As above-mentioned optical sheet parts, optically anisotropic sheet component is just not special to be limited so long as have, but the wherein preferred parts that constitute in the one or both sides laminated optical layers that demonstrates optically anisotropic light transmission base material film that use.For example diffusion barrier, lenticule film, lens etc. adopt above-mentioned formation usually, can be preferred among the present invention.The present invention can effectively obtain the few liquid crystal indicator of irregular colour through utilizing the common optical sheet that possesses of these liquid crystal indicators under the situation that does not increase new parts.
Among the present invention, above-mentioned base material film has optical anisotropy, specifically, has the different birefringence of refractive index on in-plane, and has optical axis angle and length of delay.In addition, usually, used optical characteristics such as phase difference value in above-mentioned slow axis angle with optical sheet parts of optically anisotropic base material film, the face directly to reflect the performance of base material film.
Refractive index with the slow-axis direction in the face of above-mentioned base material film is set at n x, the refractive index with the direction of slow axis quadrature in face is set at n y, when thickness setting is d, phase difference value R in the face 0Can be by (n x-n y) * d representes, the phase difference value R of thickness direction ThCan be by [(n x+ n y)/2-n z] * d representes.
As the material that forms above-mentioned base material film, consider from the transparency, photostability, coating adaptability aspect, preferably use polycarbonate or polyethylene terephthalate, use water white synthetic resin especially.As this synthetic resin, not special the qualification for example can be enumerated polyethylene terephthalate, gathered naphthalenedicarboxylic acid second diester, acryl resin, polycarbonate, polystyrene, polyolefin, acetyl cellulose, weatherability vinyl chloride etc.Wherein, preferably clear property, intensity polyethylene terephthalate or polycarbonate high, control lag value easily, preferred especially flexible improved polyethylene terephthalate.
The thickness of above-mentioned base material film (average thickness) is not special to be limited, but is preferably more than the 10 μ m and below the 400 μ m.If the not enough above-mentioned scope of the thickness of above-mentioned base material film then can occur in and be easy to generate problems such as curling when being coated with the polymer composition that is used to form optical layers such as light diffusion layer.Otherwise if the thickness of above-mentioned base material film surpasses above-mentioned scope, then the brightness of liquid crystal indicator sometimes reduces, and the thickness of backlight unit becomes the requirement that is not inconsistent the slimming of liquid crystal indicator greatly.
For above-mentioned base material film, phase difference value is preferably more than the 1000nm in the face, is preferably more than the 5000nm especially.When the optical sheet parts of base material film of the length of delay with above-mentioned scope have been used in employing, can more effectively reduce the irregular colour of liquid crystal indicator.
As the manufacturing approach of base material film, limit as long as can access in the slow axis angle, face of above-mentioned target zone phase difference value etc. optical property is just not special.For example adopting under the situation of polyethylene terephthalate, stretching conditions such as draft temperature that can be when regulating stretch processing, stretching ratio, relaxation processing, linear speed are controlled.In addition, go up under the optical property situation devious the width range that can only select to have the objective optics performance at the Width (with respect to the vertical direction of length direction) of raw material film.
As in the one or both sides laminated optical layers of above-mentioned base material film and the optical sheet parts that form are generally the above-mentioned diffusion barrier of enumerating, micro-lens sheet, lens etc.
Diffusion barrier be have make from the light of light source evenly diffusion and inject to front face side function and control light angle and improve the optics of the function of front face brightness, it is arranged on (on the light path of light source to liquid crystal panel) between light source and the liquid crystal panel usually.Area source at backlight possesses under the situation of diffuser plate, and diffusion barrier is configured between diffuser plate and the liquid crystal panel.
As diffusion barrier, for example can use the film that on the one side at least of light transmission base material film, forms the transparent resin layer (adhesive layer) that is dispersed with light diffusing agent.
Micro-lens sheet is to have to make from the evenly diffusion and inject to the function of front face side and through making light to the refraction of normal direction side and optically focused improves the sheet material of the function of front face brightness of the light of light source; Compare with diffusion barrier, show the ability of high raising front face brightness usually.As micro-lens sheet, for example can use the lenticular sheet material of geometric configuration a plurality of hemispherical (comprising the shape that approaches hemisphere) on the one side of light transmission base material film.
Lens is to have gathering improves the function of front face brightness from the light of light source sheet material, can use the sheet material that on the surface of above-mentioned transparent resin, forms the micro concavo-convex of given shape.Lens has bi-convex lens sheet, prismatic lens etc. according to the shape on micro concavo-convex surface.For example, can use the sheet material that on the one side of light transmission base material film, disposes a plurality of lens arrays side by side.
Above-mentioned optical sheet parts can contain stabilizing agents such as photodiffusion material, packing material, release agent, ultraviolet light absorber, anti-oxidant, fire retardant etc. in the scope of not damaging the object of the invention.In addition, the surface can be level and smooth, also can be provided with to be used for the tiny concavo-convex of diffusion light.
Among the present invention, above-mentioned optical sheet parts can preferably use, but consider that from the viewpoint of versatility or cost diffusion barrier wherein is particularly preferred for the present invention.
Above-mentioned diffusion barrier on the surface of the emitting side of light at least of base material film, have usually be dispersed with light diffusing agent adhesive layer as optical layers, according to said light diffusing agent, the light that sees through optical layers from the inboard is evenly spread.The average thickness of optical layers is not special to be limited, but for example is more than the 1 μ m and about below the 30 μ m.
Light diffusing agent is the particle with the character that makes the light diffusion, roughly is divided into inorganic filler and organic filler.As inorganic filler, for example can use silicon dioxide, hydrate of aluminium, aluminium oxide, zinc paste, barium sulphide, magnesium silicate or their potpourri.As the material of organic filler, for example can use acryl resin, acrylonitrile resin, polyurethane, PVC, polystyrene, polyacrylonitrile, polyamide etc.Wherein, the acryl resin that preferably clear property is high, preferred especially polymethylmethacrylate (PMMA).
Do not limit as the shape of light diffusing agent is special, but for example can enumerate spherical, spindle shape, needle-like, bar-shaped, cubic, tabular, flakey, fibrous etc., wherein, the spherical microballon that the preferred light diffusivity is excellent.As the mean grain size of light diffusing agent, for example be 1～50 μ m, 3～10 μ m more preferably.Mean grain size at light diffusing agent departs under the situation of above-mentioned scope, and is insufficient as manifesting of the needed light diffusing of diffusion sheet, is difficult to sometimes evenly be diffused on the base material film of light diffusing agent.
The use level of light diffusing agent (solid constituent conversion) is preferably 10～500 parts for 100 parts with respect to the cementing agent as matrix, more preferably 20～300 parts, further is preferably 50～200 parts.Use level at light diffusing agent departs under the situation of above-mentioned scope, and it is insufficient that light diffusing becomes, and the bed knife based on the light diffusing agent of cementing agent descends sometimes.
Cementing agent forms through making the polymer composition crosslinking curing that contains substrate polymer.Be used to form in the polymer composition of this transparent resin and except substrate polymer, can also for example small inorganic filler, hardening agent, plastifier, spreading agent, various levelling agent, ultraviolet light absorber, anti-oxidant, viscosity modifying agent, lubricant, light stabilizer etc. be arranged proper fit.
Do not limit as above-mentioned substrate polymer is special; But for example can enumerate acrylic resin, polyurethane, polyester, fluorine resin, silicon-type resin, polyamidoimide, epoxy resin, ultraviolet curing resin etc., these polymkeric substance can use to mix more than a kind or 2 kinds and use.In addition, consider that used substrate polymer itself is preferably transparently in the cementing agent, is preferably water white transparency especially from the viewpoint of the permeability that improves light.
As the manufacturing approach of above-mentioned diffusion barrier, can adopt known technology.Following method is for example arranged: mixed light diffusant in constituting the polymer composition of adhesive layer and prepare optical layers and use composition, this optical layers is stacked in composition layer on the surface of base material film, make its curing, form optical layers thus, obtain diffusion barrier.In addition, this moment, preferably on the opposite face of the side with being formed with optical layers of base material film, range upon range of adherent layer was used composition, makes its curing, forms adherent layer thus.As above-mentioned optical layers is stacked in the method on the base material film with composition and adherent layer with composition layer; Not special the qualification; For example can adopt the method for coating of having used rod coater, knife type coater, rotary coating machine, roll coater, intaglio plate coating machine, cast-type coating machine, sprayer, screen printing etc. etc.; The surface state of the viscosity of consideration above-mentioned composition, target film thickness, base material film etc. select optimal method to carry out.
Cut out diffusion barrier according to as required size and be installed to the backlight from the raw material film of the diffusion barrier of such making.
Among the present invention; To be on surface representative, by having of having that optically anisotropic base material film the constitutes liquid crystal panel side that optically anisotropic optical sheet parts are installed to backlight with above-mentioned diffusion barrier, the slow axis of these optical sheet parts of this moment be that mode below 60 ° is configured according to the slow axis with respect to the light source side diaphragm of the light incident side polarization plates of institute's adjacency.
Among the present invention, optical properties such as the slow axis angle of optical sheet parts, the interior phase difference value of face directly reflect the optical property of base material film, and the optical property that therefore needs only base material film is adjusted in the target zone.In addition, for the slow-axis direction of optical sheet parts,, can control within the scope of the invention through regulating position and the angle when optical sheet raw material film cuts out the optical sheet parts.
(optical sheet class)
Between above-mentioned area source and optical sheet parts, the optical sheet class can be set further.This optical sheet class from various backlights with selecting the optics, can for be configured in the backlight from the nearest lip-deep optical sheet parts various parts of liquid crystal panel, also can be identical parts.As the concrete example of optical sheet class, can enumerate diffusion barrier, micro-lens sheet, lens, reflective polarizing diffusion barrier etc.
(reflecting plate)
Used backlight preferably further possesses the reflecting plate of the rear side (with the liquid crystal panel opposition side) that is configured in area source among the present invention.Reflecting plate is to have to make the light reflection of penetrating to the rear side of area source, the optics with high reflectance that improves the function of the light quantity that injects to front face side.As reflecting plate, for example can use adjuvants such as inorganic filler, pigment to be dispersed in the material in the above-mentioned transparent resin, the material that perhaps above-mentioned transparent resin foaming is formed.
< optics combination >
The invention still further relates to optics combination used in the liquid crystal indicator that possesses liquid crystal cells and backlight.Optics combination be comprise the above-mentioned light incident side polarization plates of the backlight side that is used to be configured in liquid crystal cells and be used to be configured in backlight from the nearest locational above-mentioned combination of liquid crystal cells with optics of optically anisotropic optical sheet parts.Light incident side polarization plates and optical sheet parts need not being integrally formed, and in order in the manufacturing process of common liquid crystal indicator, to use, are preferably parts separately.
Same with above-mentioned light incident side polarization plates, the light incident side polarization plates that constitutes the optics combination has the polarizing coating that comprises polyvinyl alcohol resin and is layered in the optically anisotropic light source side diaphragm that has on the one side of above-mentioned polarizing coating.When using optics to make up to make liquid crystal indicator; According to having the mode that optically anisotropic light source side diaphragm is positioned at the backlight side; Configuration light incident side polarization plates has optically anisotropic optical sheet parts in the configuration on the nearest surface of liquid crystal cells on the backlight.At this moment, light incident side polarization plates and optical sheet parts are that mode below 60 ° is configured according to the slow axis of light source side diaphragm and the formed angle of slow axis with optically anisotropic optical sheet parts.
In addition, preferably, the above-mentioned light incident side polarization plates and the above-mentioned optical sheet parts that constitute the optics combination are respectively rectangular shape; With respect to rectangular long limit; The deviation angle of the slow axis of the deviation angle of the slow axis of the light source side diaphragm of above-mentioned light incident side polarization plates and above-mentioned optical sheet parts all is set in 45 °; Perhaps with respect to rectangular minor face; The deviation angle of the slow axis of the deviation angle of the slow axis of the light source side diaphragm of above-mentioned light incident side polarization plates and above-mentioned optical sheet parts all is set in 45 °, and long limit or the minor face of putting neat light incident side polarization plates and optical sheet parts then are configured.Common liquid crystal indicator has rectangular shape, therefore also forms above-mentioned configuration relation through light source side diaphragm and the optical sheet parts that make the light incident side polarization plates, can realize in phase that effective irregular colour reduces.In addition, preferred on aspect the production of common liquid crystal indicator.Certainly, under above-mentioned situation, also be to be that mode below 60 ° is configured according to slow axis with respect to the slow axis of the light source side diaphragm of light incident side polarization plates, optical sheet parts.
Embodiment
Below, embodiment is shown the present invention more specifically is described, but the present invention is not limited to these examples.
Optical sheet parts used in the following Example are following, below, represent with symbol separately.They are the rectangle diffusion barrier of 40 feet of diagonal-size (=about 102cm), with polyethylene terephthalate as base material film.Phase difference value R in the face 0And the slow axis angle is used phase retardation film optical material testing fixture RETS Dispute Resolution Mechanism of NAFTA Chapter Eleven Otsuka Electronics Co., Ltd. system respectively) measure.
(A) diffusion barrier
Phase difference value R in the face 0: 10000nm, with respect to the deviation angle of the slow axis of long side direction: 0 °
(B) diffusion barrier
Phase difference value R in the face 0: 10000nm, with respect to the deviation angle degree of the slow axis of long side direction: 30 °
(C) diffusion barrier
Phase difference value R in the face 0: 10000nm, with respect to the deviation angle of the slow axis of long side direction: 45 °
(D) diffusion barrier
Phase difference value R in the face 0: 10000nm, with respect to the deviation angle of the slow axis of long side direction: 60 °
(E) diffusion barrier
Phase difference value R in the face 0: 10000nm, with respect to the deviation angle of the slow axis of long side direction: 70 °
In addition, value (Japanese: メ one カ one the exhales the title value) expression that the thickness of used stretching polyethylene terephthalate film is formulated with manufacturer in the following Example.Phase difference value R in the face of stretching polyethylene terephthalate film 0, Nz coefficient and slow axis angle use phase retardation film optical material testing fixture RETS Dispute Resolution Mechanism of NAFTA Chapter Eleven Otsuka Electronics Co., Ltd. system respectively) measure.
In addition, the interior phase difference value R of thickness, face that comprises the optical compensation films of annular ethylene series resin 0And thickness direction phase difference value R ThValue representation with manufacturer's formulation.The interior phase difference value R of thickness, face that comprises the optical compensation films of annular ethylene series resin 0And thickness direction phase difference value R Th, also use phase retardation film optical material testing fixture RETS Dispute Resolution Mechanism of NAFTA Chapter Eleven Otsuka Electronics Co., Ltd. system) and carried out practical measurement, obtain almost same value.
< embodiment 1 >
(a) making of polarizing coating
99.9 moles of average degree of polymerization is about 2400, saponification degrees are more than the % and after the polyvinyl alcohol film of thickness 75 μ m is immersed in 30 ℃ the pure water, and the weight ratio that under 30 ℃, is immersed in iodine/potassium iodide/water is in 0.02/2/100 the WS.Thereafter, the weight ratio that under 56.5 ℃, is immersed in potassium iodide/boric acid/water is in 12/5/100 the WS.The pure water of following with 8 ℃ cleans, and is dry under 65 ℃ then, obtains in polyvinyl alcohol (PVA), adsorbing the polarizing coating that orientation has iodine.Stretch and mainly in iodine staining and boric acid treatment procedures, carry out, total stretching ratio is 5.3 times.
(b) making of the polarization plates of band bonding agent
Stretching polyethylene terephthalate film (phase difference value R in the face to thickness 38 μ m 0: 1000nm, Nz coefficient 7.0) binding face implement corona treatment after; Utilization has possessed the enclosure-type scraper, and (Japanese: apparatus for coating チ ヤ Application バ one De Network タ one), the solvent-free activation evergy line curing type adhesive composite that will contain the alicyclic epoxy compound is coated with 2 μ m thickness.In addition, to optical compensation films (the phase difference value R in the face of the annular ethylene series resin that comprises thickness 73 μ m 0: 63nm, thickness direction phase difference value R Th: binding face 225nm) utilizes device same as described above after implementing corona treatment, and adhesive composite same as described above is coated with 2 μ m thickness.
Then, utilize doubling roller immediately, across the coated face of separately adhesive composite, the above-mentioned stretching polyethylene terephthalate film of in above-mentioned (a), fitting on the one side of resulting polarizing coating, the above-mentioned optical compensation films of on another side, fitting.At this moment, the deviation angle of the slow axis of the axis of homology of polarizing coating and stretching polyethylene terephthalate film is set at 0 degree.Thereafter, from the stretching polyethylene terephthalate film side of this sandwich, the irradiation Metal halogen lamp makes that the accumulation light quantity at the wavelength of 320～400nm is 600mJ/cm 2, and the bonding agent on two sides is solidified.And then, on the outside of the optical compensation films of resulting polarization plates, the acrylic adhesive layer (band barrier film) of thickness 25 μ m is set.
(c) making of liquid crystal indicator
Peel off light emitting side polarization plates from the liquid crystal panel of the liquid crystal indicator " BRAVIA " (40 feet=about 102cm of diagonal-size) of the vertical alignment mode of Sony's (strain) system, replace it that commercially available polarization plates (ス ミ ラ Application SRW842E-GL5, Sumitomo Chemical (strain) are made) is pasted with its adhesive phase side on the direction of principal axis identical with original polarization plates.In addition; Also the light incident side polarization plates is peeled off, the polarization plates that replaces the polarization plates of its band adhesive phase that will from above-mentioned (b), make to peel off behind the barrier film is pasted (direction of principal axis that the slow axis of the absorption axes of polarizing coating and stretching polyethylene terephthalate film and the long side direction of panel are consistent) with its adhesive phase side on the direction of principal axis identical with original polarization plates.Then, remove the optical sheet parts on all diffuser plates that is configured in backlight, replace it to dispose the diffusion barrier of above-mentioned (A) from above-mentioned liquid crystal indicator.Like this, having made deviation angle (axle deviation angle) with respect to slow axis slow axis, diffusion barrier of the stretching polyethylene terephthalate film of light incident side polarization plates is 0 ° liquid crystal indicator.For resulting liquid crystal indicator, visualization, a little less than the oblique irregular colour of result (interfering uneven), identification is good.
< embodiment 2 >
Use the diffusion barrier of above-mentioned (B), in addition, likewise making the axle deviation angle with embodiment 1 is 30 ° liquid crystal indicator.For resulting liquid crystal indicator, carry out the result of visualization, a little less than the oblique irregular colour (interfering uneven), identification is good.
< embodiment 3 >
Use the diffusion barrier of above-mentioned (C), in addition, likewise making the axle deviation angle with embodiment 1 is 45 ° liquid crystal indicator.For resulting liquid crystal indicator, carry out the result of visualization, a little less than the oblique irregular colour (interfering uneven), identification is good.
< embodiment 4 >
Use the diffusion barrier of above-mentioned (D), in addition, likewise making the axle deviation angle with embodiment 1 is 60 ° liquid crystal indicator.For resulting liquid crystal indicator, carry out the result of visualization, oblique irregular colour (interfere uneven) a little less than, identification is good.
< comparative example 1 >
Use the diffusion barrier of above-mentioned (E), in addition, likewise making the axle deviation angle with embodiment 1 is 70 ° liquid crystal indicator.For resulting liquid crystal indicator, carry out the result of visualization, oblique irregular colour (interfering uneven) is strong, and identification is poor.
< embodiment 5 >
As the light source side diaphragm of polarizing coating, use stretching polyethylene terephthalate film (phase difference value R in the face 0: 4000nm, Nz coefficient 1.8), in addition, likewise making the axle deviation angle with embodiment 1 is 0 ° liquid crystal indicator.For resulting liquid crystal indicator, carry out the result of visualization, a little less than the oblique irregular colour (interfering uneven), identification is good.
< embodiment 6 >
Use the diffusion barrier of above-mentioned (B), in addition, likewise making the axle deviation angle with embodiment 5 is 30 ° liquid crystal indicator.For resulting liquid crystal indicator, carry out the result of visualization, a little less than the oblique irregular colour (interfering uneven), identification is good.
< embodiment 7 >
Use the diffusion barrier of above-mentioned (C), in addition, likewise making the axle deviation angle with embodiment 5 is 45 ° liquid crystal indicator.For resulting liquid crystal indicator, carry out the result of visualization, a little less than the oblique irregular colour (interfering uneven), identification is good.
< embodiment 8 >
Use the diffusion barrier of above-mentioned (D), in addition, likewise making the axle deviation angle with embodiment 5 is 60 ° liquid crystal indicator.For resulting liquid crystal indicator, carry out the result of visualization, oblique irregular colour (interfere uneven) a little less than, identification is good.
< comparative example 2 >
Use the diffusion barrier of above-mentioned (E), in addition, likewise making the axle deviation angle with embodiment 5 is 70 ° liquid crystal indicator.For resulting liquid crystal indicator, carry out the result of visualization, oblique irregular colour (interfering uneven) is strong, and identification is poor.
The deviation angle and the test findings with respect to the slow axis of the diffusion barrier of the slow axis of stretching polyethylene terephthalate film of the light incident side polarization plates in each example are summarized in table 1.Axle deviation angle in the table 1 is represented the deviation angle with respect to the slow axis of the diffusion barrier of the slow axis of the stretching polyethylene terephthalate film of light incident side polarization plates in the liquid crystal indicator.
[table 1]
Figure BDA0000153617700000381
As shown in table 1, be the embodiment 1～8 below 60 ° for the axle deviation angle, confirm a little less than the irregular colour of liquid crystal indicator the effect that identification is excellent.On the other hand, for the comparative example 1 and 2 of axle deviation angle greater than 60 °, irregular colour is strong, and identification is poor.
Symbol description
10 area sources
11 reflecting plates
12 optical sheet parts
20 backlights
30 light incident side polarization plates
40 smooth emitting side polarization plates
31,41 polarizing coatings
32 light source side diaphragms
42 diaphragms, 33,43 cell side diaphragm or optical compensation films
34,44 adhesive phases
50 liquid crystal cells
The light incident side polarization plates of 60 band adhesive phases
The light emitting side polarization plates of 70 band adhesive phases
80 liquid crystal panels

Claims (12)

1. liquid crystal indicator, it possesses backlight and is configured in the liquid crystal panel on the said backlight,
Said liquid crystal panel comprises liquid crystal cells and the polarization plates that is fitted in the two sides of said liquid crystal cells,
In the said polarization plates, be configured in the light incident side polarization plates of the backlight side of liquid crystal cells, have the polarizing coating that comprises polyvinyl alcohol resin and be layered in said polarizing coating the backlight side have an optically anisotropic light source side diaphragm,
Said backlight comprises the area source of full run-down type or side light type and is configured in from nearest locational of said liquid crystal panel to have optically anisotropic optical sheet parts,
According to the slow axis of said light source side diaphragm and the formed angle of slow axis of said optical sheet parts is that the following mode of 60 degree disposes said light source side diaphragm and said optical sheet parts.
2. liquid crystal indicator according to claim 1, wherein, phase difference value is more than the 200nm in the face of said light source side diaphragm.
3. liquid crystal indicator according to claim 1 and 2, wherein, said light source side diaphragm is a stretching polyethylene terephthalate film.
4. according to each described liquid crystal indicator in the claim 1～3, wherein, said optical sheet parts are selected from the group of being made up of diffusion barrier, lenticule film and lens.
5. according to each described liquid crystal indicator in the claim 1～4, wherein, be set at n in refractive index with the slow-axis direction in the face x, the refractive index with the direction of slow axis quadrature in face is set at n y, thickness direction refractive index be set at n zThe time, (the n of said light source side diaphragm x-n z)/(n x-n y) shown in the Nz coefficient be more than 4 or less than 2.
6. according to each described liquid crystal indicator in the claim 1～5, wherein, phase difference value is more than the 1000nm in the face of said optical sheet parts.
7. optics combination; It is used for possessing the liquid crystal indicator of liquid crystal cells and backlight; It comprises: what the light incident side polarization plates and being used to that is used to be configured in the said backlight side of said liquid crystal cells was configured in said backlight has optically anisotropic optical sheet parts from nearest locational of said liquid crystal cells
Said light incident side polarization plates have the polarizing coating that comprises polyvinyl alcohol resin and be layered in said polarizing coating one side have an optically anisotropic light source side diaphragm; When being used for liquid crystal indicator; Said light incident side polarization plates is configured in the mode of said backlight side according to said light source side diaphragm; And, be that mode below 60 ° disposes said light source side diaphragm and said optical sheet parts according to the formed angle of slow axis of the slow axis of said light source side diaphragm and said optical sheet parts.
8. optics combination according to claim 7, wherein, phase difference value is more than the 200nm in the face of said light source side diaphragm.
9. according to claim 7 or 8 described optics combinations, wherein, said light source side diaphragm is a stretching polyethylene terephthalate film.
10. according to each described optics combination in the claim 7～9, wherein, said optical sheet parts are selected from the group of being made up of diffusion barrier, lenticule film and lens.
11., wherein, be set at n in refractive index with the slow-axis direction in the face according to each described optics combination in the claim 7～10 x, the refractive index with the direction of slow axis quadrature in face is set at n y, thickness direction refractive index be set at n zThe time, (the n of said light source side diaphragm x-n z)/(n x-n y) shown in the Nz coefficient be more than 4 or less than 2.
12. according to each described optics combination in the claim 7～11, wherein, phase difference value is more than the 1000nm in the face of said optical sheet parts.
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CN108845451B (en) * 2012-07-30 2021-12-10 东洋纺株式会社 Liquid crystal display device, polarizing plate and polarizer protective film
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JP2011090042A (en) 2011-05-06
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KR101630902B1 (en) 2016-06-15
JP5568808B2 (en) 2014-08-13

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