CN108292004B

CN108292004B - Strip optical laminate and image display device

Info

Publication number: CN108292004B
Application number: CN201680070747.1A
Authority: CN
Inventors: 喜多川丈治; 西村明宪; 梅本彩香
Original assignee: Nittosan Engineering Co Ltd
Current assignee: Nittosan Engineering Co Ltd
Priority date: 2015-12-02
Filing date: 2016-11-21
Publication date: 2019-11-08
Anticipated expiration: 2036-11-21
Also published as: WO2017094539A1; CN108292004A; JP6453746B2; TW201728928A; KR20180088405A; TWI673524B; KR102014924B1; JP2017102286A

Abstract

The present invention provides a kind of strip optical laminate, can reduce the deviation of the display characteristic of each product in the case where severing is predetermined size and is applied to image display device.Optical laminate of the invention is strip, successively have comprising polarizer and the polarizing film of protective layer positioned at at least side of polarizer, first phase difference layer, second phase difference layer, conductive layer and with substrate made of the closely sealed stacking of conductive layer.Phase difference Re (550) is 3nm~6nm in the face of substrate, and the deviation of the phase difference in width direction is 10%~30%, and the deviation of the slow-axis direction in width direction is 1 °~5 °.Phase difference Re (550) is 220nm~250nm in the face of first phase difference layer, the slow axis of first phase difference layer and the absorption axiss angulation of polarizer are 10 °~20 °, phase difference Re (550) is 110nm~125nm in the face of second phase difference layer, and the slow axis of second phase difference layer and the absorption axiss angulation of polarizer are 65 °~85 °.

Description

Strip optical laminate and image display device

Technical field

The present invention relates to strip optical laminate and use the image display device of the strip optical laminate.

Background technique

In recent years, popularizing with thin display, proposing the display equipped with organic EL panel, (organic EL is shown Device).Since organic EL panel has reflexive high metal layer, thus it is easy to produce mirroring for external light reflection or background Problem.It is thus known that having by the way that circular polarizing disk is arranged in visual confirmation side prevents these problems.On the other hand, single in display The so-called embedded touch control panel type input display dress of touch sensing is assembled between first (such as organic EL units) and polarizing film The demand set is continuously improved.The input and display device of this composition since image-display units are close at a distance from touch sensing, Naturally input operation sense can be thus assigned to user.

For embedded touch control panel type input and display device with polarizing film (or circular polarizing disk), from being thinned, prevent quality Deviation improves the consideration of the viewpoints such as manufacture efficiency, is studying polarizing film (or circular polarizing disk) and touch sensing electric conductivity is thin The integration of film.For example, attempting strip polarizing film (or circular polarizing disk) and strip conductive membrane passing through so-called roller pair Roller (roll to roll) is bonded.But by it is roll-to-roll it is integrated with conductive membrane after polarizing film there are width sides To the big such problems of characteristic deviation.As a result by it is this it is integrated with conductive membrane after polarizing film severing be regulation ruler It is very little and be applied to image display device in the case where, there are the display characteristic of each product generation be difficult to the deviation allowed the case where.

Existing technical literature

Patent document

Patent document 1: Japanese Unexamined Patent Publication 2003-311239 bulletin

Patent document 2: Japanese Unexamined Patent Publication 2002-372622 bulletin

Patent document 3: No. 3325560 bulletins of Japanese Patent No.

Patent document 4: Japanese Unexamined Patent Publication 2003-036143 bulletin

Summary of the invention

Problem to be solved by the invention

The present invention is to complete in order to solve the above-mentioned existing problems, and main purpose is: providing a kind of strip light Laminated body is learned, which can subtract in the case where severing is predetermined size and is applied to image display device The deviation of the display characteristic of small each product.

The means used to solve the problem

Optical laminate of the invention is strip, is successively had comprising polarizer and positioned at least the one of the polarizer The polarizing film of the protective layer of side, first phase difference layer, second phase difference layer, conductive layer and with the conductive layer is closely sealed is laminated Substrate.Phase difference Re (550) is 3nm~6nm in the face of the substrate, and the deviation of the phase difference of the substrate in the direction of the width is 10%~30%, the deviation of the slow-axis direction of the substrate in the direction of the width is 1 °~5 °.In optical laminate of the invention, Phase difference Re (550) is 220nm~250nm, the slow axis of the first phase difference layer and the polarization in the face of the first phase difference layer The absorption axiss angulation of device is 10 °~20 °；In the face of the second phase difference layer phase difference Re (550) be 110nm~ 125nm, the slow axis of the second phase difference layer and the absorption axiss angulation of the polarizer are 65 °~85 °.

For an embodiment, above-mentioned optical laminate is web-like.

For an embodiment, the width of above-mentioned optical laminate is 500mm or more.

For an embodiment, above-mentioned first phase difference layer and above-mentioned second phase difference layer are by annular ethylene series resin Film is constituted.For another embodiment, above-mentioned first phase difference layer and above-mentioned second phase difference layer are liquid-crystal compounds It is orientated cured layer.

According to another aspect of the present invention, a kind of image display device is provided.The image display device has is by severing The above-mentioned optical laminate of predetermined size.

Invention effect

According to the present invention, for the strip optical layer with polarizing film, phase separation layer and touch sensing conductive layer Stack carries out optical compensation by making specific two phase separation layers combination as phase separation layer, despite the presence of due to being formed There is the width direction of optical laminate caused by deviation of the phase difference of the substrate of conductive layer and the width direction of phase difference etc. Characteristic deviation, but by the optical laminate severing be predetermined size and be applied to image display device in the case where can Reduce the deviation of the display characteristic of each product.

Detailed description of the invention

Fig. 1 is the schematic cross-sectional view of the optical laminate of an embodiment of the invention.

Fig. 2 is the schematic top plan view being illustrated to the overall structure of the oblique extension device for reference example 4.

Fig. 3 is main for being illustrated to the bindiny mechanism for changing fixture spacing in the oblique extension device of Fig. 2 Partial top schematic diagram shows the smallest state of fixture spacing.

Fig. 4 is main for being illustrated to the bindiny mechanism for changing fixture spacing in the oblique extension device of Fig. 2 Partial top schematic diagram shows the maximum state of fixture spacing.

Fig. 5 is the schematic diagram being illustrated to the embodiment of the oblique extension for reference example 4.

Fig. 6 is each region of oblique extension device when indicating oblique extension shown in fig. 5 and the relationship of fixture spacing Figure.

Specific embodiment

Hereinafter, embodiments of the present invention will be described, but the present invention is not limited to these embodiments.

(definition of term and symbol)

Term and symbol in this specification are defined as follows described.

(1) refractive index (nx, ny, nz)

" nx " is refractive index of the refractive index in face as maximum direction (i.e. slow-axis direction), and " ny " is in face and slow The refractive index in the orthogonal direction of axis (i.e. fast axis direction), " nz " are the refractive index of thickness direction.

(2) phase difference (Re) in face

" Re (λ) " is phase difference in the face obtained using the flash ranging that the wavelength at 23 DEG C is λ nm.For example, " Re (550) " are benefit Phase difference in the face obtained with the flash ranging that the wavelength at 23 DEG C is 550nm.When the thickness of layer (film) is set as d (nm), Re (λ) can be found out by formula Re (λ)=(nx-ny) × d.

(3) phase difference (Rth) of thickness direction

" Rth (λ) " is the phase difference of the thickness direction obtained using the flash ranging that the wavelength at 23 DEG C is λ nm.For example, " Rth It (550) " is the phase difference of the thickness direction obtained using the flash ranging that the wavelength at 23 DEG C is 550nm.By the thickness of layer (film) When being set as d (nm), Rth (λ) can be found out by formula Rth (λ)=(nx-nz) × d.

(4) Nz coefficient

Nz coefficient can be found out by Nz=Rth/Re.

A. the overall structure of optical laminate

Fig. 1 is the schematic cross-sectional view of the optical laminate of an embodiment of the invention.The optical layer of present embodiment Stack 100 successively has polarizing film 10, first phase difference layer 20, second phase difference layer 30, conductive layer 41 and substrate 42.Polarizing film 10 comprising polarizer 11, the side for being configured at polarizer 11 the first protective layer 12 and be configured at polarizer 11 the other side the Two protective layers 13.According to purpose, one of the first protective layer 12 and the second protective layer 13 can also be omitted.For example, in the first phase In the case that potential difference layer 20 can also play the function as the protective layer of polarizer 11, the second protective layer 13 can be omitted.Substrate 42 With the closely sealed stacking of conductive layer 41.In this specification, " closely sealed stacking " refer to two layers not across adhesive layer (such as adhesive layer, Adhesive phase) and directly and be adhesively laminated.Conductive layer 41 and substrate 42 typically can be with the layers of substrate 42 and conductive layer 41 The form of stack is directed into optical laminate 100.In addition, in order to be easy to observe, the ratio and reality of the thickness of each layer in attached drawing Border is different.

Although with reference to the accompanying drawings and indefinite, the optical laminate of embodiments of the present invention is strip.Therefore, optics The constituent element (such as polarizing film, phase separation layer, substrate) of laminated body is also strip.For an embodiment, by light Learn laminated body wound into rolls.In this specification, " strip " refer to length relative to the sufficiently long elongated shape of width, such as The elongated shape for being 10 times or more, preferably 20 times or more relative to width comprising length.Therefore, optical laminate 100 is for example It can make in the following way: by strip polarizing film 10, the strip phase-contrast film of composition first phase difference layer 20, composition The strip phase-contrast film and strip conductive membrane (laminated body of conductive layer 41 and substrate) of second phase difference layer 30 It is laminated by roll-to-roll.In addition, " roll-to-roll " refers to makes mutual strip while carrying roll film in this specification Direction is unanimously bonded.

As described above, there are two phase separation layer (first phase difference layer 20 and second phase difference layers for the tool of optical laminate 100 30).First phase difference layer 20 has slow axis.The slow axis of first phase difference layer 20 and the absorption axiss angulation of polarizer 11 are 10 °~20 °, preferably 13 °~17 °, even more preferably about 15 °.First phase difference layer preferred index characteristic shows nx > ny The relationship of >=nz.Phase difference Re (550) is 220nm~250nm, preferably 230nm~240nm in the face of first phase difference layer. Second phase difference layer 30 also has slow axis.The slow axis of second phase difference layer 30 is with the absorption axiss angulation of polarizer 11 65 °~85 °, preferably 72 °~78 °, even more preferably about 75 °.Second phase difference layer preferred index characteristic shows nx > ny The relationship of >=nz.Phase difference Re (550) is 110nm~125nm, preferably 115nm~120nm in the face of second phase difference layer. As described above, phase difference is set to be slightly less than the plate of so-called λ/2, phase in the face of second phase difference layer in the face of first phase difference layer Potential difference is set to be slightly less than the plate of so-called λ/4.It, can be in the feelings for constituting each phase separation layer using materials described below by so setting Under condition, very excellent reflectivity and reflection tone are realized.According to the present invention, by make that there is characteristic as described above two Phase separation layer combines to carry out optical compensation, despite the presence of the deviation etc. of the width direction of phase difference and phase difference due to substrate Caused by optical laminate width direction characteristic deviation, but by the optical laminate severing be predetermined size and answering The deviation of the display characteristic of each product can be reduced in the case where for image display device.This effect is that have and above-mentioned two What the single phase separation layer of the optically equivalent characteristic of the combination of a phase separation layer was unable to get.That is, this effect is to make Above-mentioned two phase separation layer is applied in combination to make optical laminate and answer the optical laminate severing for predetermined size It is unexpected excellent effect for the opinion that image display device just obtains.

Phase difference Re (550) is 3nm~6nm, preferably 4nm~5nm in the face of substrate 42.Substrate 42 is in the direction of the width Phase difference deviation be 10%~30%, preferably 15%~25%.The slow-axis direction of substrate 42 in the direction of the width it is inclined Difference is 1 °~5 °, preferably 1 °~3 °.According to the present invention, just at last in substrate with phase difference and in the phase in width direction Potential difference and slow-axis direction lead to the characteristic of the width direction of optical laminate there are deviation there are in the case where deviation, by such as It is upper described to make specific two phase separation layers combination to carry out optical compensation, being predetermined size for the optical laminate severing Also it can reduce the deviation of the display characteristic of each product in the case where applied to image display device.In addition, in this specification, " phase The deviation of potential difference " refers to the maximum value of the deviation relative to setting phase difference, and " deviation of slow-axis direction " refers to relative to setting The maximum value of the deviation of slow-axis direction.

The width of optical laminate is preferably 500mm or more, more preferably 800mm or more.The upper limit of width is, for example, 1500mm.Width is wider, the characteristic of the width direction of the optical laminate due to caused by phase difference of above-mentioned substrate etc. it is inclined Difference is bigger, thus plays effect of the invention with can dramatically.

For an embodiment, first phase difference layer 20 and second phase difference layer 30 are made of resin film respectively. For another embodiment, first phase difference layer 20 and second phase difference layer 30 may respectively be the orientation solidification of liquid-crystal compounds Layer.In addition, resin film is described in detail in C-2 and D-2, exist for the orientation cured layer of liquid-crystal compounds It is described in detail in C-3 and D-3.

Other than the closely sealed stacking of conductive layer 41 and substrate 42, each layer for constituting optical laminate can be across any appropriate Adhesive layer (adhesive layer or adhesive phase: not shown) be laminated, can also be with the conductive layer 41 and substrate 42 the case where in the same manner as Closely sealed stacking.

The size changing rate of optical laminate is preferably 1% hereinafter, more preferably 0.95% or less.The ruler of optical laminate Very little change rate is the smaller the better.The lower limit of the size changing rate of optical laminate is, for example, 0.01%.When the size of optical laminate When change rate is in this range, inhibit the generation of the crackle of the conductive layer under high temperature and humidity with can dramatically.

The overall thickness of optical laminate is preferably 220 μm hereinafter, more preferably 80 μm~190 μm.In first phase difference layer 20 and second phase difference layer 30 be liquid-crystal compounds orientation cured layer in the case where, the overall thickness of optical laminate is preferably 175 μm hereinafter, more preferably 80 μm~140 μm.

Hereinafter, each layer, optical thin film and the adhesive that constitute optical laminate are described in more detail.

B. polarizing film

B-1. polarizer

As polarizer 11, any suitable polarizer can be used.For example, the resin film for forming polarizer can be single layer Resin film, can also be two layers or more of laminated body.

As the specific example for the polarizer being made of the resin film of single layer, can enumerate to polyvinyl alcohol (PVA) It is that film, part formalizing PVA system film, vinyl-vinyl acetate copolymer pastern divide the hydrophilies high score such as saponified film Sub- film implements the substance obtained from the dyeing processing and stretch processing of the dichroic substances such as iodine, dichroic dye；PVA's The polyenoid system such as dehydration treatment, dehydrochlorinated products of polyvinyl chloride oriented film etc..From optical characteristics it is excellent from the aspect of, It is preferable to use polarizers obtained from PVA system film is dyed and is uniaxially stretched using iodine.

The above-mentioned dyeing carried out using iodine for example can be by carrying out in iodine aqueous solution by PVA system is thin film dipped.Above-mentioned list The stretching ratio that axis stretches is preferably 3~7 times.Stretching can carry out after dyeing processing, can also carry out while being dyed It stretches.In addition, can also be dyed after the stretch.Swelling treatment, crosslinking Treatment, cleaning optionally can be implemented to PVA system film Processing, drying process etc..For example, washed in water before dyeing by PVA system is thin film dipped, thus not only PVA capable of washing It is spot, the antiblocking agent of film surface, PVA system films swell can also be made and prevent from dyeing unequal.

As the specific example for using polarizer obtained from laminated body, it can enumerate using resin base material and be laminated in this The laminated body or resin base material of the PVA resin (PVA based resin film) of resin base material and coating are formed in the resin base Polarizer obtained from the laminated body of the PVA resin of material.The PVA of the resin base material is formed in using resin base material and coating Polarizer obtained from the laminated body of resin can for example make in the following way: PVA system resin solution is coated on tree Aliphatic radical material is allowed to dry and forms PVA resin on resin base material, thus obtains resin base material and PVA resin Laminated body；The laminated body is stretched and dyed, polarizer is made in PVA resin.For present embodiment, generation It is table to stretch comprising being impregnated in laminated body in boric acid aqueous solution and stretching.In turn, stretching can further include optionally Laminated body is stretched in the air with high temperature (such as 95 DEG C or more) before stretching in boric acid aqueous solution.Obtained resin (that is, can be using resin base material as the protective layer of polarizer) can be used directly in substrate/polarizer laminated body, can also be by resin base Material is removed from resin base material/polarizer laminated body, and any suitable protective layer corresponding with purpose is laminated in the release surface To use.The detailed content of the manufacturing method of this polarizer is for example recorded in Japanese Unexamined Patent Publication 2012-73580 bulletin.The public affairs The whole contents of report are used as reference to be cited to this specification.

The thickness of polarizer is preferably 18 μm hereinafter, more preferably 1 μm~12 μm, further preferably 3 μm~12 μm, special It You Xuanwei not be 5 μm~12 μm.

The boric acid content of polarizer is preferably 18 weight % or more, more preferably 18 weight of weight %~25 %.It is polarizing It, can be by the synergistic effect with following content of iodine, when being well maintained fitting in the case that the boric acid content of device is this range The easiness of curling is adjusted, and inhibits curling when heating well, while improving appearance durability when heating.Boric acid contains Amount for example can use following formula as boric acid amount included in the polarizer of per unit weight to calculate according to neutralisation.

The content of iodine of polarizer is preferably 2.1 weight % or more, more preferably 2.1 weight of weight %~3.5 %.It is polarizing It, can be by the synergistic effect with above-mentioned boric acid content, when being well maintained fitting in the case that the content of iodine of device is this range The easiness of curling is adjusted, and inhibits curling when heating well, while improving appearance durability when heating.This explanation In book, " content of iodine " refers to the amount of all iodine included in polarizer (PVA based resin film).More specifically, it is polarizing Iodine is in device with iodide ion (I^-), iodine molecule (I₂), more iodide ion (I₃ ^-、I₅ ^-) etc. in the presence of forms, the content of iodine in this specification Refer to that these forms are integrally incorporated in the amount of interior iodine.Content of iodine for example can by the calibration curve method of x-ray fluorescence analysis come It calculates.In addition, the state that more iodide ions form PVA- iodo-complexes in polarizer exists.By forming this complex compound, It can show to absorb dichroism in the wave-length coverage of visible light.Specifically, the complex compound (PVA- of PVA and teriodide ion I₃ ^-) there is extinction peak, the complex compound (PVA-I of PVA and pentaiodide ion near 470nm₅ ^-) there is suction near 600nm Photopeak.As a result more iodide ions can absorb light in the broad range of visible light according to its form.On the other hand, iodide ion (I^-) In 230nm nearby has extinction peak, is substantially not involved in the absorption of visible light.Therefore, with existing for the state of the complex compound of PVA More iodide ions can be primarily involved in the absorbent properties of polarizer.

Polarizer preferably shows absorption dichroism under any wavelength of wavelength 380nm~780nm.Polarizer it is independent Transmissivity (single transmission) is 43.0%~46.0%, preferably 44.5%~46.0% as described above.Polarization The degree of polarization of device is preferably 97.0% or more, and more preferably 99.0% or more, further preferably 99.9% or more.

B-2. the first protective layer

First protective layer 12 is formed by any suitable film that can be used as the protective layer of polarizer.As the film Main component material specific example, can enumerate the cellulose-based resins such as triacetyl cellulose (TAC), Polyester, Polyethenol series, polycarbonate-based, polyamide-based, polyimides system, polyether sulfone system, polysulfones system, polystyrene, poly- norborneol The transparent resin etc. of alkene system, polyolefin, (methyl) acrylic acid series, acetic acid esters system etc..In addition, (methyl) propylene can also be enumerated The thermohardening type resin or purple of sour system, carbamate system, (methyl) propenoic methyl carbamate system, epoxy, silicone-based etc. Outside line gel-type resin etc..In addition, the nature of glass based polymer such as can also enumerate siloxane-based polymers.In addition, can also Use thin polymer film documented by Japanese Unexamined Patent Publication 2001-343529 bulletin (WO01/37007).As the material of the film, Such as thermoplastic resin and side chain containing side chain with the imide for being substituted or being unsubstituted can be used to have through taking The resin combination of the thermoplastic resin of generation or the phenyl and itrile group that are unsubstituted, such as can enumerate with by isobutene and N- The resin combination of alternate copolymer and acrylonitritrile-styrene resin that methylmaleimido is formed.The polymer thin Film may be, for example, the extrusion molding object of above-mentioned resin combination.

Optical laminate of the invention is typically configured at the visual confirmation side of image display device as described below, and first Protective layer 12 is typically configured at its visual confirmation side.Therefore, it can optionally implement hard coating to the first protective layer 12, resist The surface treatment such as reflection processing, release treatment, non-glare treated.And/or the first protective layer 12 optionally can also be implemented to change The processing of visual confirmation when the kind progress visual confirmation across polarisation sunglasses (typically assigns (ellipse) circular polarization function Can, it assign superelevation phase difference).By implementing this processing, just at last visual across polarized lenses such as polarisation sunglasses In the case where confirmation display picture, excellent visual confirmation can also be realized.Therefore, optical laminate can also suitable applications in energy Enough image display devices in outdoor application.

For the thickness of the first protective layer, as long as the thickness of above-mentioned desired polarizing film can be obtained and protected with second The difference of the thickness of layer, so that it may use any suitable thickness.The thickness of first protective layer is, for example, 10 μm~50 μm, preferably 15 μm~40 μm.In addition, the thickness of the first protective layer is the thickness for including surface-treated layer in the case where implementing surface treatment Thickness inside.

B-3. the second protective layer

Second protective layer 13 is also formed by any suitable film that can be used as the protective layer of polarizer.As the film The material of main component is as being illustrated the first protective layer in B-2 above-mentioned.Second protective layer 13 is preferably Optical isotropy.In this specification, " optical isotropy " refers to that phase difference Re (550) is 0nm~10nm, thickness side in face To phase difference Rth (550) be -10nm~+10nm.

The thickness of second protective layer is, for example, 15 μm~35 μm, preferably 20 μm~30 μm.The thickness of first protective layer with The difference of the thickness of second protective layer is preferably 15 μm hereinafter, more preferably 10 μm or less.In the feelings that the difference of thickness is this range Under condition, curling when fitting can favorably inhibit.The thickness of first protective layer can be identical with the thickness of the second protective layer, can also First protective layer is thicker, can also the second protective layer it is thicker.Typically, the first protective layer is thicker than the second protective layer.

C. first phase difference layer

C-1. the characteristic of first phase difference layer

As described above, first phase difference layer 20 has slow axis.The absorption of the slow axis and polarizer 11 of first phase difference layer 20 Axis angulation is preferably 10 °~20 °, more preferably 13 °~17 °, more preferably about 15 °.In first phase difference layer It, can be by as described below by the first phase in the case that 20 slow axis and the absorption axiss angulation of polarizer 11 are this range Phase difference is respectively set as prescribed limit in the face of potential difference layer and second phase difference layer, and relative to the absorption axiss of polarizer to advise Thus the slow axis for determining angle configurations second phase difference layer obtains having very excellent circularly polarized light characteristic (result in broadband For very excellent antireflective properties) optical laminate.

First phase difference layer preferred index characteristic shows the relationship of nx > ny >=nz.Phase in the face of first phase difference layer Potential difference Re (550) is 220nm~250nm, preferably 230nm~240nm.In addition, herein, " ny=nz " not only includes ny and nz Essentially equal situation also includes the case where being substantially equal.Therefore, in the range of lossless effect of the invention, ny may be present The case where < nz.

The Nz coefficient of first phase difference layer is preferably 0.9~3, more preferably 0.9~2.5, further preferably 0.9~ 1.5, particularly preferably 0.9~1.3.By meeting this relationship, obtained optical laminate is being used for image display dress , it can be achieved that very excellent reflection tone in the case where setting.

First phase difference layer can show the reverse dispersion wavelength characteristic that phase difference value becomes larger according to the wavelength of measurement light, It can also show the positive wavelength dispersion characteristics that phase difference value becomes smaller according to the wavelength of measurement light, can also show phase difference value The almost unconverted flat wavelength dispersion characteristics according to the wavelength of measurement light.For an embodiment, first phase Poor layer show phase difference value according to the wavelength of measurement light almost unconverted flat wavelength dispersion characteristics.In the situation Under, it is preferably 0.98~1.02 that Re (450)/Re (550) of phase separation layer, which is preferably 0.99~1.03, Re (650)/Re (550),. By make to show flat wavelength dispersion characteristics and first phase difference layer with phase difference in predetermined surface with show it is flat Wavelength dispersion characteristics and second phase difference layer with phase difference in predetermined surface come with regulation slow axis angle combinations using can be Broadband realizes very excellent antireflective properties.

First phase difference layer includes that the absolute value of photoelastic coefficient is preferably 2 × 10^-11m²/ N or less, more preferably 2.0 × 10^-13m²/ N~1.5 × 10^-11m²/ N, further preferably 1.0 × 10^-12m²/ N~1.2 × 10^-11m²The resin of/N.Photoelastic In the case that the absolute value of property coefficient is this range, phase difference is not susceptible in the case where generating shrinkage stress when heating Variation.As a result, can prevent the heat of obtained image display device uneven well.

The size changing rate of first phase difference layer is preferably 1% hereinafter, more preferably 0.95% or less.First phase difference layer Size changing rate it is the smaller the better.The lower limit of the size changing rate of first phase difference layer is, for example, 0.01%.In first phase difference In the case that the size changing rate of layer is this range, inhibit the generation of the crackle of the conductive layer under high temperature and humidity with can dramatically.

C-2. the first phase difference layer being made of resin film

In the case where first phase difference layer is made of resin film, thickness is preferably 60 μm hereinafter, preferably 30 μm ~50 μm.In the case where first phase difference layer is with a thickness of this range, phase difference in desired face can be obtained.

First phase difference layer 20 can be by that can meet any suitable resin film of documented characteristic in C-1 above-mentioned It constitutes.As the typical example of this resin, annular ethylene series resin, polycarbonate-based resin, cellulose-based tree can be enumerated Rouge, polyester based resin, polyvinyl alcohol resin, polyamide resin, polyimides system resins, polyether system resin, polystyrene It is resin, acrylic resin.In first phase difference layer by showing the case where resin film of flat wavelength characteristic is constituted Under, it can be suitble to using annular ethylene series resin.

Annular ethylene series resin is the general designation for the resin being polymerize using cyclic olefin as polymerized unit, such as can be enumerated The institutes such as Japanese Unexamined Patent Publication 1-240517 bulletin, Japanese Unexamined Patent Publication 3-14882 bulletin, Japanese Unexamined Patent Publication 3-122137 bulletin The resin of record.As specific example, the addition polymerization of the open loop (co) polymer, cyclic olefin of cyclic olefin can be enumerated The copolymer (being typically random copolymer) of the alpha-olefins such as object, cyclic olefin and ethylene, propylene and by these using not Saturated carboxylic acid, its it is derivative modified made of graft modification body and their hydride.As the specific example of cyclic olefin, Orbornene-based monomer can be enumerated.As orbornene-based monomer, such as norbornene and its alkyl can be enumerated And/or alkylidene substituent for example 5- methyl -2- norbornene, 5- dimethyl -2- norbornene, 5- ethyl -2- norbornene, 5- butyl -2- norbornene, 5- ethylidene -2- norbornene etc., their halogen isopolarity group substituent；Two rings penta 2 Alkene, 2,3- dihydro bicyclopentadiene etc.；Dimethano octahydro naphthalene, its alkyl and/or alkylidene substituent and halogen isopolarity base Group's substituent such as 6- methyl-1,4:5,8- dimethano -1,4,4a, 5,6,7,8,8a- octahydro naphthalene, 6- ethyl -1,4:5,8- two First bridge -1,4,4a, 5,6,7,8,8a- octahydro naphthalene, 6- ethylidene -1,4:5,8- dimethano -1,4,4a, 5,6,7,8,8a- octahydro Chloro- 1,4:5,8- dimethano -1,4,4a, the 5,6,7,8,8a- octahydro naphthalene of naphthalene, 6-, 6- cyano -1,4:5,8- dimethano -1,4,4a, 5,6,7,8,8a- octahydro naphthalene, 6- pyridyl group -1,4:5,8- dimethano -1,4,4a, 5,6,7,8,8a- octahydro naphthalene, 6- methoxyl group carbonyl Base -1,4:5,8- dimethano -1,4,4a, 5,6,7,8,8a- octahydro naphthalene etc.；Trimer~tetramer such as 4,9 of cyclopentadiene: 5,8- dimethano -3a, 4,4a, 5,8,8a, 9,9a- octahydro -1H- benzindene, 4,11:5,10:6,9- trimethano -3a, 4,4a, 5, Ten dihydro -1H- cyclopentano anthracene of 5a, 6,9,9a, 10,10a, 11,11a- etc..

In the present invention, can in the range of the lossless purpose of the present invention and with can ring-opening polymerisation other cyclenes hydro carbons.Make For the specific example of this cycloolefin, such as cyclopentene, cyclo-octene, 5,6- dihydro bicyclopentadiene etc. can be enumerated with one The compound of a reactive double bond.

For above-mentioned annular ethylene series resin, by being measured using gel permeation chromatography (GPC) method of toluene solvant Number-average molecular weight (Mn) is preferably 25000~200000, further preferably 30000~100000, most preferably 40000~ 80000.In the case where number-average molecular weight is above range, mechanical strength can be made, make dissolubility, mouldability, curtain coating Operability it is good.

Substance obtained from being to hydrogenate the ring-opening polymerization polymer of orbornene-based monomer in above-mentioned annular ethylene series resin In the case of, hydrogenation ratio is preferably 90% or more, and further preferably 95% or more, most preferably 99% or more.For this model In the case where enclosing, resistance to thermal deterioration and fast light deterioration etc. are excellent.

It can also be used commercially available film as above-mentioned annular ethylene series resin film.As specific example, can enumerate day Trade name " ZEONEX ", " ZEONOR ", the trade name " Arton " of JSR company manufacture, TICONA company of Ben Ruiweng company manufacture The trade name " APEL " that trade name " TOPAS ", the Mitsui Chemicals, Inc.'s system of manufacture are made.

First phase difference layer 20 for example can by the film formed by above-mentioned polycarbonate-based resin stretched come It arrives.As the method for forming film by annular ethylene series resin, any suitable shaping operation method can be used.As concrete example Son can enumerate: compression forming methods, transfer formation method, injection molding method, extrusion moulding, blow molding method, powder compacting Method, FRP (Fiber Reinforced Plastics；Fiber-reinforced plastic) method of forming, casting rubbing method (such as the tape casting), Rolling-molding method, pressure sintering etc..Preferably extrusion moulding or casting rubbing method.Its reason is: can be improved obtained thin The flatness of film obtains good optical homogeneity.Condition of molding can be according to composition or type, the phase difference of used resin Characteristic desired by film etc. and suitably set.In addition, as described above, annular ethylene series resin has a large amount of films to produce due to commercially available Product, thus the commercially available film can be directly supplied to stretch processing.

The thickness of resin film (non-stretched film) can desired thickness, desired optics according to first phase difference film Characteristic, aftermentioned stretching condition etc. and be set as any suitable value.Preferably 50 μm~300 μm.

Any suitable drawing process, stretching condition (such as draft temperature, stretching ratio, stretching can be used in above-mentioned stretching Direction).It specifically, can be by various drawing process such as free end stretching, fixing end stretching, free end contraction, fixing end contractions It is used alone, can also while or gradually use.It, also can be in length direction, width direction, thickness side for draw direction It is carried out to the various directions such as, oblique direction or dimension.Glass transition temperature of the temperature of stretching preferably with respect to resin film It (Tg) is Tg-30 DEG C~Tg+60 DEG C, more preferably Tg-10 DEG C~Tg+50 DEG C.

By proper choice of above-mentioned drawing process, stretching condition, it can obtain having above-mentioned desired optical characteristics (such as to roll over Penetrate rate characteristic, phase difference, Nz coefficient in face) phase-contrast film.

For an embodiment, phase-contrast film can be by advising strip resin film relative to length direction Determine continuously to carry out oblique extension on the direction of angle to make.By using oblique extension, the length relative to film can be obtained Spend the strip oriented film of the angle of orientation (on the direction of the angle have slow axis) of the direction with predetermined angular, such as can be It realizes roll-to-roll when being laminated with polarizer, manufacturing step can be simplified.In addition, the angle can be the suction of polarizer in optical laminate Receive the slow axis angulation of axis and first phase difference layer.Preferably 10 °~20 ° as described above of the angle, more preferably 13 °~ 17 °, more preferably about 15 °.

As the stretching-machine for oblique extension, such as can enumerate can be left in laterally and/or longitudinally upper addition speed The tentering formula stretching-machine of right different centripetal force or drawing force or tractive force.Tentering formula stretching-machine have laterally be uniaxially stretched machine, Simultaneously biaxial drawing machine etc., as long as oblique extension continuously can be carried out strip resin film, so that it may using any suitable Stretching-machine.

By appropriately respectively controlling the speed of left and right for above-mentioned stretching-machine, it can obtain that there is phase in above-mentioned desired face Potential difference and the first phase difference layer (being essentially strip phase-contrast film) on above-mentioned desired direction with slow axis.

The draft temperature of above-mentioned film can phase difference value and thickness in the face according to desired by first phase difference layer, used The type of resin, the thickness of used film, stretching ratio etc. and change.Specifically, draft temperature is preferably Tg-30 DEG C ~Tg+30 DEG C, further preferably Tg-15 DEG C~Tg+15 DEG C, most preferably Tg-10 DEG C~Tg+10 DEG C.By in this temperature It is stretched under degree, the first phase difference layer with appropriate characteristics can be obtained in the present invention.In addition, Tg is the composition material of film The glass transition temperature of material.

C-3. the first phase difference layer being made of the orientation cured layer of liquid-crystal compounds

First phase difference layer 20 can also be the orientation cured layer of liquid-crystal compounds.By using liquid-crystal compounds, with non-liquid Brilliant material compares the difference that can significantly increase the nx and ny of obtained phase separation layer, therefore can be obviously reduced desired for obtaining The thickness of the first phase difference layer of phase difference in face.As a result, it can be achieved that the further slimming of optical laminate.First In the case that phase separation layer 20 is made of the orientation cured layer of liquid-crystal compounds, thickness is preferably 1 μm~7 μm, more preferably 1.5 μm~2.5 μm.It, can be same with resin film to be substantially thinner than the thickness realization of resin film by using liquid-crystal compounds Deng face in phase difference.

In this specification, " orientation cured layer " refers to that liquid-crystal compounds is orientated in layer to prescribed direction and it is orientated shape The fixed layer of state.In addition, " orientation cured layer " is comprising being orientated cured layer obtained from solidifying liquid crystal monomer as described below Concept.In present embodiment, typically, rodlike liquid-crystal compounds is to be arranged in the slow-axis direction of first phase difference layer State is orientated (horizontal alignment).As liquid-crystal compounds, for example, can enumerate liquid crystalline phase be nematic liquid-crystal compounds (to Column liquid crystal).As this liquid-crystal compounds, such as liquid crystal polymer, liquid crystal monomer can be used.The liquid crystal liquid crystal property of liquid-crystal compounds No matter performance mechanism is molten cause type or thermotropic.Liquid crystal polymer and liquid crystal monomer can use individually, can also be into Row combination.

In the case where liquid-crystal compounds is liquid crystal monomer, which is preferably polymerizable monomer and bridging property list Body.Its reason is: by polymerizeing liquid crystal monomer or being crosslinked and (solidify), the state of orientation of liquid crystal monomer can be made to fix. After being orientated liquid crystal monomer, such as in the case where keeping liquid crystal monomer polymerized together or being crosslinked, it thus can make above-mentioned orientation shape State is fixed.Herein, polymer is formed by polymerization, forms tridimensional network by being crosslinked, these are non-liquid crystal property.Cause This, be formed by first phase difference layer for example and will not occur liquid crystal compounds it is specific due to caused by temperature change to The transformation of liquid crystalline phase, glass phase, crystal phase.As a result, first phase difference layer becomes stability pole independent of temperature variations Its excellent phase separation layer.

Liquid crystal monomer shows that the temperature range of liquid crystal liquid crystal property is different according to its type.Specifically, the temperature range is preferred It is 40 DEG C~120 DEG C, further preferably 50 DEG C~100 DEG C, most preferably 60 DEG C~90 DEG C.

As above-mentioned liquid crystal monomer, any suitable liquid crystal monomer can be used.For example, Japanese Unexamined Patent Application Publication 2002- can be used 533742(WO00/37585)、EP358208(US5211877)、EP66137(US4388453)、WO93/22397、 Polymerizable mesogenic compound etc. documented by EP0261712, DE19504224, DE4408171 and GB2280445 etc..As this The specific example of kind polymerizable mesogenic compound, such as trade name LC242, the Merck company of BASF AG can be enumerated The trade name LC-Sillicon-CC3767 of trade name E7, Wacker-Chem company.As liquid crystal monomer, for example, preferably to Column liquid crystal monomer.

The orientation cured layer of liquid-crystal compounds is it can be formed as follows: implement orientation position to the surface of regulation substrate Reason makes the liquid-crystal compounds in side corresponding with above-mentioned orientation process in coating fluid of the surface coating comprising liquid-crystal compounds It is upwardly oriented, and fixes the state of orientation.By using this orientation process, liquid-crystal compounds can be made relative to strip base The strip direction of material is orientated in the prescribed direction, and slow axis as a result can be shown in the prescribed direction for be formed by phase separation layer. For example, the phase separation layer with slow axis on the direction for being 15 ° relative to strip direction can be formed in long strip base material.It is this Phase separation layer with regard to can also be used at last in expectation in the case where having slow axis on oblique direction it is roll-to-roll be laminated, therefore The productivity of optical laminate can significantly improve.For an embodiment, substrate is any suitable resin film, is formed The surface of polarizing film 10 can be transferred in the orientation cured layer on the substrate.For another embodiment, substrate can be the Two protective layers 13.Transfer printing process can be omitted in this case, continuously led to from the formation of orientation cured layer (first phase difference layer) Cross it is roll-to-roll be laminated, therefore productivity further increases.

As above-mentioned orientation process, any suitable orientation process can be used.Specifically, mechanicalness can be enumerated to take To processing, physical orientation process, chemically orientation process.As the specific example of mechanicalness orientation process, can enumerate Friction treatment, stretch processing.As the specific example of physical orientation process, magnetic field orientating processing can be enumerated, electric field takes To processing.As the specific example of chemically orientation process, oblique evaporation method, light orientation processing can be enumerated.Various orientations The treatment conditions of processing can use any suitable condition according to purpose.

The orientation of liquid-crystal compounds by according to the type of liquid-crystal compounds show liquid crystalline phase at a temperature of at It manages to carry out.By carrying out this Temperature Treatment, so that liquid-crystal compounds is taken mesomorphic state, make the liquid-crystal compounds according to substrate table The orientation process direction in face and be orientated.

For an embodiment, the fixation of state of orientation passes through the liquid-crystal compounds after orientation as described above is cooling Come carry out.In the case where liquid-crystal compounds is polymerizable monomer or cross-linkable monomer, the fixation of state of orientation passes through to as above Liquid-crystal compounds after the orientation implements polymerization processing or crosslinking Treatment to carry out.

The details of the forming method of the specific example and orientation cured layer of liquid-crystal compounds is recorded in Japanese Unexamined Patent Publication 2006-163343 bulletin.The contents of the bulletin are used as reference to be cited into this specification.

D. second phase difference layer

D-1. the characteristic of second phase difference layer

As described above, second phase difference layer 30 has slow axis.The absorption of the slow axis and polarizer 11 of second phase difference layer 30 Axis angulation is preferably 65 °~85 °, more preferably 72 °~78 °, more preferably about 75 °.Second phase difference layer 30 Slow axis and the slow axis angulation of first phase difference layer 20 be preferably 52 °~68 °, more preferably 57 °~63 °, further Preferably from about 60 °.In the feelings that the slow axis of second phase difference layer 30 and the absorption axiss angulation of polarizer 11 are this range , can be by the way that phase difference in the face of first phase difference layer be set as prescribed limit as described above under condition, the suction relative to polarizer Axis is received with the slow axis of predetermined angular configuration first phase difference layer, and as described below sets phase difference in the face of second phase difference layer For prescribed limit, thus obtain there is very excellent circularly polarized light characteristic in broadband that (result is very excellent antireflection Characteristic) optical laminate.

Second phase difference layer preferred index characteristic shows the relationship of nx > ny >=nz.Phase in the face of second phase difference layer Potential difference Re (550) is 110nm~125nm, preferably 115nm~120nm.

The size changing rate of second phase difference layer is preferably 1% hereinafter, more preferably 0.95% or less.Second phase difference layer Size changing rate it is the smaller the better.The lower limit of the size changing rate of second phase difference layer is, for example, 0.01%.It is poor in second phase In the case that the size changing rate of layer is this range, high temperature and humidity lower conductiving layer can be significantly inhibited and cracked.

For other characteristics of second phase difference layer, such as first phase difference layer is illustrated in C-1 above-mentioned As.

D-2. the second phase difference layer being made of resin film

In the case where second phase difference layer is made of resin film, thickness is preferably 40 μm hereinafter, preferably 25 μm ~35 μm.In the case where second phase difference layer is with a thickness of this range, phase difference in desired face can be obtained.In the second phase In the case that potential difference layer is made of resin film, material, characteristic, manufacturing method etc. are such as in C-2 above-mentioned to first phase As poor layer is illustrated.

D-3. the second phase difference layer being made of the orientation cured layer of liquid-crystal compounds

Second phase difference layer 30 can be the orientation cured layer of liquid-crystal compounds in the same manner as first phase difference layer.In the second phase In the case that potential difference layer 30 is made of the orientation cured layer of liquid-crystal compounds, thickness is preferably 0.5 μm~2 μm, more preferably 1 μm~1.5 μm.In the case where second phase difference layer is made of the orientation cured layer of liquid-crystal compounds, material, characteristic, manufacture Method etc. is as being illustrated first phase difference layer in C-3 above-mentioned.

D-4. the combination of first phase difference layer and second phase difference layer

First phase difference layer and second phase difference layer can be used as any suitable combination to use.Specifically, it can be First phase difference layer is made of resin film and second phase difference layer is made of the orientation cured layer of liquid-crystal compounds；It can be First phase difference layer is made of the orientation cured layer of liquid-crystal compounds and second phase difference layer is made of resin film；It can be First phase difference layer and second phase difference layer are made of resin film；It is also possible to first phase difference layer and second phase difference layer It is made of the orientation cured layer of liquid-crystal compounds.Preferably: in the case where first phase difference layer is made of resin film, Second phase difference layer is also made of resin film；The case where first phase difference layer is made of the orientation cured layer of liquid-crystal compounds Under, second phase difference layer is also made of the orientation cured layer of liquid-crystal compounds.In addition, poor in first phase difference layer and second phase In the case that layer is made of resin film, first phase difference layer and second phase difference layer can be identical, can also constitute in detail It is different.It is also phase in the case where first phase difference layer and second phase difference layer are made of the orientation cured layer of liquid-crystal compounds With.

E. conductive layer

Conductive layer can pass through any suitable film build method (such as vacuum vapour deposition, sputtering method, CVD (Chemical Vapor Deposition；Chemical vapor deposition) method, ion plating method, spray-on process etc.) on any suitable substrate make metal oxygen Compound film forms a film and is formed.After film forming, it can optionally be heated (such as 100 DEG C~200 DEG C).By being heated Processing, can be such that amorphous film crystallizes.As metal oxide, such as indium oxide, tin oxide, zinc oxide, indium-can be enumerated Tin composite oxides, tin-antimony composite oxides, zinc-aluminium composite oxide, indium-zinc composite oxide.It can also be in indium oxide Adulterate bivalent metal ion or quadrivalent metallic ion.Preferably indium system complex oxide, more preferably indium-tin composite oxides (ITO).Indium system complex oxide with visible light region (380nm~780nm) have high-transmission rate (such as 80% or more) And the low such feature of the sheet resistance value of per unit area.

In the case where conductive layer includes metal oxide, the thickness of the conductive layer is preferably 50nm hereinafter, more preferably 35nm or less.The lower limit of the thickness of conductive layer is preferably 10nm.

The sheet resistance value of conductive layer is preferably 300 Ω/sq hereinafter, more preferably 150 Ω/sq is hereinafter, further preferably For 100 Ω/sq or less.

Conductive layer can be optionally patterned.By Butut, conducting portion and insulation division can be formed.It, can as layout method Using any suitable method.As the specific example of layout method, wet etching, silk screen print method can be enumerated.

F. substrate

As substrate, any suitable resin film can be used.Resin film preferably with the excellent transparency.Make For the specific example of constituent material, annular ethylene series resin can be enumerated, polycarbonate-based resin, cellulose-based resin, gathered Ester system resin, acrylic resin.

As described above, substrate has phase difference and slow axis in face, in the face, phase difference and slow-axis direction be in the direction of the width With deviation.As described above, according to the present invention, just at last in the characteristic that there is the width direction due to caused by this substrate In the case where deviation, can also it reduce in the case where optical laminate severing is applied to image display device for predetermined size The deviation of the display characteristic of each product.

The thickness of substrate is preferably 10 μm~200 μm, more preferably 20 μm~60 μm.

Hard conating (not shown) can also be set if necessary between conductive layer 41 and substrate 42.As hard conating, can be used Hard conating with any suitable composition.The thickness of hard conating is, for example, 0.5 μm~2 μm.As long as mist degree is allowed band, The particle for reducing Newton's ring can be added in hard conating.In turn, (can also exist if necessary in conductive layer 41 and substrate 42 In the case where hard conating be hard conating) between be arranged for improving the anchor coat of the adaptation of conductive layer and/or for adjusting The refractive index adjustment layer of reflectivity.As anchor coat and refractive index adjustment layer, any suitable composition can be used.Anchor coat It can be several nanometers~tens nanometers of thin layer with refractive index adjustment layer.

Other hard paintings can also be set with conductive layer opposite side (outermost of optical laminate) if necessary in substrate 42 Layer.The hard conating typically includes binder resin layer and spherical particle, and spherical particle is from binder resin layer protrusion And form protrusion.The details of this hard conating is recorded in Japanese Unexamined Patent Publication 2013-145547 bulletin, the record of the bulletin Content is used as reference to be cited to this specification.

G. other

The optical laminate of embodiments of the present invention also can further include other phase separation layers.Other phase separation layers Optical characteristics (such as phase difference, Nz coefficient, photoelastic coefficient in refractive index characteristic, face), thickness, allocation position etc. can be according to mesh And suitably set.

On practical, the surface of substrate 42 is provided with the adhesive phase (not shown) for conforming to display unit.It is preferred that It is supplied in optical laminate and is fitted with stripping film on the surface of the adhesive phase using preceding.

H. image display device

Documented strip optical laminate can be applied to image by severing for predetermined size in above-mentioned A to G Display device.Therefore, the present invention includes the image display device for having used this optical laminate.As image display device Typical example can enumerate liquid crystal display device, organic EL display device.The image display device of embodiments of the present invention exists It is documented optical laminate in above-mentioned A to G of predetermined size that its visual confirmation side, which has by severing,.Optical laminate (visual confirmation side is become in such a way that conductive layer becomes display unit (such as liquid crystal cells, organic EL units) side with polarizer Mode) be laminated.That is, the image display device of embodiments of the present invention can for display unit (such as liquid crystal cells, Organic EL units) and polarizing film between be assembled with the so-called embedded touch control panel type input and display device of touch sensing.At this In the case of, touch sensing is configured between conductive layer (or with substrate conductive layer) and display unit.With regard to touch sensing For composition, composition well known to industry can be used, therefore omit detailed description.

Embodiment

Hereinafter, the present invention is specifically described by embodiment, but the present invention is not limited by these embodiments.This Outside, the measuring method of each characteristic is as described below.

(1) thickness

For the phase separation layer (the orientation cured layer of liquid-crystal compounds) that coating is formed, big tomb electronic manufacture is used MCPD2000 is measured by interference film thickness measuring.For other films, (pacify vertical corporation using digital micrometer The KC-351C that makes) it is measured.

(2) phase difference value

By automatic double refraction detection device, (prince measures the manufacture of machine Co., Ltd., automatic birefringence meter KOBRA- WPR) refractive index nx, ny and the nz of measurement for the phase separation layer and substrate of embodiment and comparative example.The survey of phase difference Re in face The measurement wavelength of standing wave a length of 450nm and 550nm, thickness direction phase difference Rth are 550nm, and measuring temperature is 23 DEG C.

(3) deviation of phase difference value and slow-axis direction

In film roll (the polycyclic alkene of reference example 5 for constituting the substrate with substrate conductive layer for embodiment and comparative example Hydrocarbon film roll) width direction on to be cut into the sample of five 50mm × 50mm at equal intervals.For the sample being cut into, make It is found out in face with automatic double refraction detection device (prince measures machine Co., Ltd. and manufactures, automatic birefringence meter KOBRA-WPR) Phase difference Re (550) and slow axis.Maximum value (%) relative to the deviation of setting phase difference is set as to the deviation of phase difference value, Maximum value relative to the deviation of setting slow-axis direction is set as to the deviation of slow-axis direction.

(4) display characteristic of image display device

The smart phone (Galaxy-S5) that Samsung wireless company manufactures is decoupled and takes out organic EL panel.By implementing In the width direction that the optical laminate that example and the obtained width of comparative example are 500mm is rolled up be cut at equal intervals five 50mm × The sample of 50mm.The sample being cut into is bonded with organic EL panel, and tone is reflected with visual confirmation.Evaluation criteria is as follows It is described.

It is good: to show neutral reflection tone, and difference is had no for five sample reflection tones

It is bad: although confirming the difference of color for each sample for neutral reflection tone

[reference example 1: the production of polarizing film]

For polyvinyl alcohol (PVA) based resin film (Kuraray manufacture, ProductName " PE3000 ") with a thickness of 30 μm Long silver lap carries out being uniaxially stretched one in the longitudinal direction roller stretching machine in a manner of becoming 5.9 times on length direction on one side Swelling, dyeing, crosslinking, cleaning treatment are implemented in side simultaneously, finally implement to be dried, thus make the polarizer with a thickness of 12 μm 1。

Specifically, swelling treatment is stretched to 2.2 times while the pure water using 20 DEG C is handled.Then, it dyes The processing iodine after having adjusted iodine concentration in such a way that the independent transmissivity of obtained polarizer is 45.0% and iodate on one side It is handled in 30 DEG C of the aqueous solution that the weight ratio of potassium is 1:7 and is stretched to 1.4 times on one side.In turn, crosslinking Treatment uses two ranks The crosslinking Treatment of section, the crosslinking Treatment of first stage is on one side in 40 DEG C of the aqueous solution dissolved with boric acid and potassium iodide Reason is stretched to 1.2 times on one side.The boric acid content of the aqueous solution of the crosslinking Treatment of first stage is set as 5.0 weight %, potassium iodide Content is set as 3.0 weight %.The crosslinking Treatment of second stage is on one side in 65 DEG C of the aqueous solution dissolved with boric acid and potassium iodide In handled and be stretched to 1.6 times on one side.The boric acid content of the aqueous solution of the crosslinking Treatment of second stage is set as 4.3 weights % is measured, iodate potassium content is set as 5.0 weight %.In addition, cleaning treatment is handled using 20 DEG C of potassium iodide aqueous solution. The iodate potassium content of the aqueous solution of cleaning treatment is set as 2.6 weight %.Finally, drying process is 5 minutes dry with 70 DEG C, obtain Strip polarizer 1.

Across polyethenol series bonding agent, the TAC film that Konica Minolta Opto Inc. is manufactured (ProductName: Thickness: KC2UA 25 μm, corresponds to the second protective layer) and in the single side of the TAC film there is the hard painting that is formed by hard coating (HC) layer HC-TAC film (thickness: 32 μm, correspond to the first protective layer) respectively by it is roll-to-roll fit in it is obtained The two sides of strip polarizer 1, the strip for thus obtaining the composition with 1/ second protective layer of the first protective layer/polarizer are inclined Shake piece 1.

[reference example 2: constituting the production of the liquid crystal aligning cured layer of first phase difference layer]

Would indicate that nematic liquid crystal phase polymerizable liquid crystal (BASF AG manufacture: trade name " Paliocolor LC242 ", It is expressed from the next) 10g and (BASF AG manufactures: trade name to the Photoepolymerizationinitiater initiater of the polymerizable liquid crystal compound " Irgacure 907 ") 3g is dissolved in toluene 40g, thus prepare liquid-crystal composition (coating fluid).

It is real using friction cloth friction strip polyethylene terephthalate (PET) film (with a thickness of 38 μm) surface Apply orientation process.For the condition of orientation process, Rubbing number (friction roller number) is 1, and friction roller radius r is 76.89mm, Friction roller revolving speed nr is 1500rpm, and film delivery speed v is 83mm/ seconds, as shown in Table 1 in frictional strength RS and intrusion M It is carried out under five kinds of condition (a)~(e).

Table 1

	Frictional strength RS (mm)	Intrusion M (mm)
			Condition (a)	2618	0.3
Condition (b)	3491	0.4
			Condition (c)	4363	0.5
Condition (d)	1745	0.2
			Condition (e)	873	0.1

The direction of orientation process is set as when conforming to polarizing film relative to the direction of the absorption axiss of polarizer from visual Confirmation side is viewed as -75 ° of directions.Above-mentioned liquid crystal coating liquid is coated with by bar coater on the orientation process surface, is added at 90 DEG C Heated drying 2 minutes, thus it is orientated liquid-crystal compounds.The state of orientation of liquid-crystal compounds is very good at condition (a)~(c) It is good.The orientation of liquid-crystal compounds generates confusion slightly under condition (d) and (e), but is the practical upper level that there is no problem.It is right In the liquid crystal layer being thusly-formed, metal halide light irradiation 1mJ/cm is used²Light, make the curable liquid crystal layer, thus in strip Phase separation layer (liquid crystal aligning cured layer) 1 is formed in shape PET film.Phase separation layer 1 with a thickness of 2 μm, phase difference Re in face It (550) is 236nm.In turn, phase separation layer 1 has the index distribution of nx > ny=nz.

[reference example 3: constituting the production of the liquid crystal aligning cured layer of second phase difference layer]

It is real using friction cloth friction strip polyethylene terephthalate (PET) film (with a thickness of 38 μm) surface Apply orientation process.The direction of orientation process is set as when conforming to polarizing film relative to the direction of the absorption axiss of polarizer from mesh - 15 ° of directions are viewed as depending on confirmation side.Be coated with identical with reference example 2 liquid crystal coating liquid on the orientation process surface, with reference The identical mode of example 2 makes liquid-crystal compounds be orientated and solidify, and phase separation layer 2 is thus formed in strip PET film.Phase difference Layer 2 with a thickness of 1.2 μm, in face phase difference Re (550) be 115nm.In turn, phase separation layer 2 has the refraction of nx > ny=nz Rate distribution.

[reference example 4: constituting the production of the phase-contrast film of phase separation layer]

Have gathering in batches for the vertical reactor of stirring blade and control at 100 DEG C of reflux cooler using comprising two It attaches together to set and be polymerize.By 9,9- [4- (2- hydroxyl-oxethyl) phenyl] fluorenes (BHEPF), isosorbite (ISB), diethylene glycol (DEG), diphenyl carbonate (DPC) and magnesium acetate 4 hydrate are to be calculated as BHEPF/ISB/DEG/DPC/ acetic acid according to molar ratio Magnesium=0.348/0.490/0.162/1.005/1.00 × 10^-5Mode be added.Nitrogen is sufficiently carried out in by reactor to set After changing (oxygen concentration is 0.0005~0.001 volume %), is heated using thermal medium, opened at the time of temperature reaches 100 DEG C inside Begin to stir.Start that interior temperature is made to reach 220 DEG C after forty minutes in heating, is controlled, started simultaneously in a manner of keeping the temperature Decompression, 90 minutes after reaching 220 DEG C are set as 13.3kPa.100 will be directed into the phenol vapor of polymerization reaction together by-product DEG C reflux cooler, if making to be back to reactor comprising the monomer component of dry measure in phenol vapor, by uncooled phenol Steam is directed into 45 DEG C of condenser and is recycled.

Nitrogen is imported to first reactor and temporarily restores pressure to atmospheric pressure, then by the oligomer in first reactor Reaction solution after change is transferred to second reactor.Then, start the heating and decompression in second reactor, thus set at 50 minutes Determine into interior temperature to be 240 DEG C, pressure 0.2kPa.Thereafter, the polymerization is continued until reaching regulation stirring power.Reaching regulation power At the time of to reactor import nitrogen and restore pressure, reaction solution extract in the form of strands, and utilization rotary cutter into Row pelletizing batch obtains the polycarbonate resin A of the copolymerization composition of BHEPF/ISB/DEG=34.8/49.0/16.2 [mol%].It should The reduced viscosity of polycarbonate resin is 0.430dL/g, and glass transition temperature is 128 DEG C.

Obtained polycarbonate resin is dried in vacuo 5 hours at 80 DEG C, then using having single screw extrusion machine (manufacture of Isuzu Motors chemical industry machine company, screw diameter 25mm, barrels set temperature: 220 DEG C), T die head (width 900mm, if Determine temperature: 220 DEG C), the film film forming apparatus of chill roll (set temperature: 125 DEG C) and coiling machine, thus make with a thickness of 130 μ The polycarbonate resin film of m.

(oblique extension)

The polycarbonate resin film obtained in the above described manner is passed through according to Japanese Unexamined Patent Publication 2014-194483 bulletin The method of embodiment 1 carries out oblique extension, obtains phase-contrast film.That is, using Fig. 2~device shown in fig. 5, shown in Fig. 6 The distribution of fixture spacing be supplied to the pre-heat treatment, oblique extension and MD shrink process, obtain phase-contrast film.In addition, with regard to device Detailed composition for, the contents of Japanese Unexamined Patent Publication 2014-194483 bulletin are used as with reference to being cited to this specification.Phase The specific production step of potential difference film is as described below: by polycarbonate resin film (with a thickness of 130 μm, width 765mm) In The preheated zone of stretching device is preheated to 142 DEG C.In preheated zone, the fixture spacing of the fixture of left and right is 125mm.Secondly, In While film enters to the first oblique extension region C1, starts the fixture spacing for increasing right side fixture, be allowed to oblique first Stretch zones C1 increases to 177.5mm from 125mm.Fixture spacing change rate is 1.42.In the first oblique extension region C1, for The fixture spacing of left side fixture starts to reduce fixture spacing, is allowed to reduce from 125mm to 90mm in the first oblique extension region C1. Fixture spacing change rate is 0.72.In turn, while film enters the second oblique extension region C2, start to increase left side fixture Fixture spacing, be allowed to increase to 177.5mm from 90mm in the second oblique extension region C2.On the other hand, the folder of right side fixture Have spacing and still maintains 177.5mm in the second oblique extension region C2.In addition, while above-mentioned oblique extension, also in width 1.9 times of stretching is carried out on direction.In addition, above-mentioned oblique extension carries out at 135 DEG C.

(MD shrink process)

Then, MD shrink process is carried out in constriction zone.Specifically, make the fixture spacing of left side fixture and right side fixture Reduce from 177.5mm to 165mm.Shrinking percentage in MD shrink process is 7.0%.

Obtain phase-contrast film in the above described manner (with a thickness of 50 μm).The Re (550) of obtained phase-contrast film is 141nm, birefringence n_xyIt is 0.00282.Using obtained phase-contrast film as phase separation layer 3.

[reference example 5: the production of conductive membrane (with substrate conductive layer)]

Using the strip polycyclic alkene film with a thickness of 50 μm, (the auspicious father-in-law of Japan is manufactured, trade name " ZEONOR (registrar Mark) ") it is used as substrate.In a face coated UV line hardening resin composition (manufacture of DIC company, the trade name of the substrate " UNIDIC (registered trademark) RS29-120 "), and it is 1 minute dry with 80 DEG C, then carry out ultraviolet curing, formed with a thickness of 1.0 μm of hard conating.Then, in another face of substrate, coating includes ultra-violet solidified resin composition same as described above Acrylic acid series spherical particle (Soken Chemical Company manufacture, the trade name " MX- that 100 parts by weight and mode particle size are 1.9 μm 180TA ") additions of 0.002 parts by weight has the hardening resin composition of spherical particle, and ultraviolet curing is carried out later, is formed With a thickness of 1.0 μm of hard conating.Polycyclic alkene film obtained above is put into sputtering equipment, in the hard conating for being free of particle Surface forms the uncrystalline layer of the indium tin oxide with a thickness of 27nm.Then, the uncrystalline layer of indium tin oxide will be formed with Polycyclic alkene film carried out in 130 DEG C of heating furnace 90 minutes heat, thus produce sheet resistance value be 100 Ω/ The transparent conducting film of sq.Phase difference Re (550) is 4nm in the face of substrate, and the deviation of the phase difference of width direction is 20%, The deviation of the angle of orientation (direction of slow axis) of width direction is 2 °.

[reference example 6: the production of conductive membrane (with substrate conductive layer)]

In addition to used with a thickness of 50 μm PET film (east beautiful manufacture, trade name " Lumirror#50 ") as substrate with Outside, it is 100 Ω/sq transparent conducting film that sheet resistance value is made in a manner of identical with reference example 5.

[reference example 7: the production of adhesive phase]

In the reaction vessel for having condenser pipe, nitrogen ingress pipe, thermometer and agitating device, butyl acrylate is added together 0.3 part of 99 parts, 1.0 parts of acrylic acid 4- hydroxybutyl and 2,2'- azodiisobutyronitrile and ethyl acetate.Make mixed in reaction vessel It closes object and is reacted 4 hours with 60 DEG C under nitrogen flowing, then add ethyl acetate to the reaction solution, thus obtain containing Weight-average molecular The solution (solid component concentration 30%) for the acrylic acid series polymeric compounds that amount is 1,650,000.Relative to above-mentioned acrylic acid series polymeric compounds (the NOF Corp's manufacture: Nyper of every 0.15 part of 100 parts of mixtures of the dibenzoyl peroxide of the solid component of solution BO-Y), 0.1 part of trimethylolpropane xylene diisocyanate (Mitsui Takeda Chemical Co., Ltd: Takenate D110N) and 0.2 part silane coupling agent (Soken Chemical & Engineering Co., Ltd. manufacture: A-100 contains the silane coupled of acetoacetyl Agent), thus obtain adhesive phase formation solution.By above-mentioned adhesive phase formation with solution coating to by being removed using silicone-based On the spacer that the polyester film that agent is surface-treated is formed, and heat within 3 minutes with 155 DEG C, thus obtain With a thickness of 15 μm of adhesive phase A.

[reference example 8: the production of adhesive phase]

In the reaction vessel for having condenser pipe, nitrogen ingress pipe, thermometer and agitating device, butyl acrylate is added together 0.1 part of 94.9 parts, 5 parts of acrylic acid and acrylic acid 2- hydroxy methacrylate and relative to 100 parts of these monomers (solid component) be 0.3 part Benzoyl peroxide and ethyl acetate.So that mixture in reaction vessel is reacted 7 hours under nitrogen flowing with 60 DEG C, then to The reaction solution adds ethyl acetate, thus obtains the solution (solid for the acrylic acid series polymeric compounds for being 2,200,000 containing weight average molecular weight Constituent concentration is 30 weight %).Every 0.6 part of 100 parts of mixtures of solid component relative to above-mentioned acrylic polymer solution Trimethylolpropane toluene diisocyanate (Japanese polyurethane Co., Ltd. manufacture: Coronate L) and 0.075 part of γ-ring Oxygen propoxypropyl methoxy silane (Shin-Etsu Chemial Co., Ltd's manufacture: KBM-403), thus obtains adhesive phase and is formed Use solution.By above-mentioned adhesive phase formation with solution coating to the polyester by being surface-treated using silicone series stripping agent On the spacer that film is formed, and heat within 3 minutes with 155 DEG C, thus obtains the adhesive phase B with a thickness of 15 μm.

[embodiment 1]

Second protection level of polarizing film 1 and phase separation layer 1 are passed through into roller across the acrylic acid series bonding agent with a thickness of 5 μm Roller is bonded.As a result, the slow axis angulation of the absorption axiss of polarizer and phase separation layer 1 is 15 °.Then, it will be formed There is the PET film of phase separation layer 1 to remove, passes through roll-to-roll patch across the acrylic acid series bonding agent with a thickness of 5 μm in the release surface Close phase separation layer 2.As a result, the slow axis angulation of the absorption axiss of polarizer and phase separation layer 2 is 75 °.In turn, by shape At the PET film removing for having phase separation layer 2, the circle with polarizing film/first phase difference layer/second phase difference layer composition is obtained Polarizing film 1.By the second phase difference layer of circular polarizing disk 1 and the conductive layer with substrate conductive layer obtained by reference example 5 across viscous Mixture layer A obtains the optical laminate 1 of strip (web-like that width is 500mm) by roll-to-roll fitting.By obtained light Learn the evaluation that laminated body 1 is supplied to above-mentioned (4).Show the result in table 2.

[comparative example 1]

Second protection level of polarizing film 1 is passed through with phase separation layer 3 across the acrylic acid series bonding agent with a thickness of 12 μm Roll-to-roll fitting obtains the circular polarizing disk 2 with polarizing film/phase separation layer composition.As a result, the absorption axiss of polarizer with The slow axis angulation of phase separation layer 3 is 45 °.The structure for being composed two phase separation layers in this composition and embodiment 1 At optically substantially equivalent.The conduction with substrate conductive layer obtained by the phase separation layer of circular polarizing disk 2 and by reference example 5 Layer is bonded across adhesive phase A, obtains the optical laminate 2 of strip (web-like that width is 500mm).By obtained optics Laminated body 2 is supplied to the evaluation of above-mentioned (4).Show the result in table 2.

Table 2

﹡ PC is polycarbonate-based resin film

From the embodiment in watch 2 compared with comparative example: although being formed with the phase difference of the substrate of conductive layer and slow The deviation of the width direction of axis direction is identical, and the compensation function of phase separation layer is optically equivalent, but specific by making Two phase separation layer combinations carry out optical compensation as phase separation layer, are being regulation ruler by the optical laminate severing of wide web-like Very little and deviation applied to the display characteristic that can reduce each product in the case where image display device.

Industrial availability

Optical laminate of the invention can be suitable for the image as liquid crystal display device and organic EL display device Display device can especially be suitable as the anti-reflection film of organic EL display device.In turn, optical laminate of the invention can fit It shares in embedded touch control panel type input and display device.

Symbol description

10 polarizing films

11 polarizers

12 first protective layers

13 second protective layers

20 first phase difference layers

30 second phase difference layers

41 conductive layers

42 substrates

100 optical laminates

Claims

1. a kind of strip optical laminate successively has the protection comprising polarizer and positioned at at least side of the polarizer Layer polarizing film, first phase difference layer, second phase difference layer, conductive layer and with substrate made of the closely sealed stacking of the conductive layer,

Wherein, phase difference Re (550) is 3nm~6nm, the deviation of the phase difference of the substrate in the direction of the width in the face of the substrate It is 10%~30%, the deviation of the slow-axis direction of the substrate in the direction of the width is 1 °~5 °,

In the face of the first phase difference layer phase difference Re (550) be 220nm~250nm, the slow axis of the first phase difference layer with should The absorption axiss angulation of polarizer is 10 °~20 °,

In the face of the second phase difference layer phase difference Re (550) be 110nm~125nm, the slow axis of the second phase difference layer with should The absorption axiss angulation of polarizer is 65 °~85 °.

2. strip optical laminate as described in claim 1, is web-like.

3. strip optical laminate as described in claim 1, width is 500mm or more.

4. strip optical laminate as described in claim 1, wherein the first phase difference layer and the second phase are poor Layer is made of annular ethylene series resin film.

5. strip optical laminate as described in claim 1, wherein the first phase difference layer and the second phase are poor Layer is the orientation cured layer of liquid-crystal compounds.

6. a kind of image display device has the optical laminate described in claim 1 by severing for predetermined size.