CN108292063A - Liquid crystal display device - Google Patents

Liquid crystal display device Download PDF

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Publication number
CN108292063A
CN108292063A CN201680069960.0A CN201680069960A CN108292063A CN 108292063 A CN108292063 A CN 108292063A CN 201680069960 A CN201680069960 A CN 201680069960A CN 108292063 A CN108292063 A CN 108292063A
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China
Prior art keywords
liquid crystal
crystal display
film
polarizer
display device
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CN201680069960.0A
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CN108292063B (en
Inventor
饭田敏行
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Nitto Denko Corp
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Nitto Denko Corp
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Priority to CN202111189626.8A priority Critical patent/CN113917738A/en
Priority claimed from PCT/JP2016/084246 external-priority patent/WO2017094529A1/en
Publication of CN108292063A publication Critical patent/CN108292063A/en
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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
    • G02F1/13363—Birefringent elements, e.g. for optical compensation
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements

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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)
  • Optical Filters (AREA)

Abstract

The liquid crystal display device that excellent the purpose of the present invention is to provide colorrendering quality and when by optical component visual confirmation with polarization visual confirmation is excellent and irregular colour is inhibited.The liquid crystal display device (500) of the present invention has：Liquid crystal display panel (100), which includes liquid crystal cells (10), be configured at liquid crystal cells (10) visual confirmation side the first polarizer (20) and be configured at the second polarizer (30) of back side；Phase separation layer (200), the potential difference layer (200) are configured at the visual confirmation side of liquid crystal display panel；And back light (300), the back light (300) illuminate liquid crystal display panel (100) by back side.Phase difference Re (550) is 100nm~180nm in the face of phase separation layer (200), and meets the relationship of Re (450) ＜ Re (550) ＜ Re (650).The slow axis of phase separation layer (200) is 35 °~55 ° with the long side angulation of liquid crystal display panel (100).Back light (300) has discrete emission spectrum.

Description

Liquid crystal display device
Technical field
The present invention relates to liquid crystal display devices.
Background technology
In recent years, such as mobile phone, smart mobile phone, plate PC (PC), auto-navigation system, digital signage, window Display etc. is increased like that under strong extraneous light using the chance of liquid crystal display device.As described above in outdoor application liquid In the case of crystal device, when visual confirmation person, which wears polarisation sunglasses, observes the liquid crystal display device, the polarisation sun The transmission axis direction of the transmission axis direction of glasses and the exiting side of liquid crystal display device is according to the angle observed by visual confirmation person And can become crossed Nicol state, as a result, there are picture blackening and can not visual confirmation go out the case where showing image.For It solves the problems, such as this, it is proposed that configure the skill of the plates of λ/4 or superelevation phase-contrast film in the visual confirmation side of liquid crystal display device Art.
On the other hand, in order to improve the colorrendering quality of liquid crystal display device, trial make back light close to red (R), The characteristic of the independent light source of green (G), blue (B).However, for this trial, only in the visual confirmation of liquid crystal display device Side configures the plates of λ/4, superelevation phase-contrast film as polarisation sunglasses countermeasure, and there is also will produce coloring and/or irregular colour Deng problem.
Existing technical literature
Patent document
Patent document 1：Japanese Unexamined Patent Publication 2005-352068 bulletins
Patent document 2：Japanese Unexamined Patent Publication 2011-107198 bulletins
Invention content
Problem to be solved by the invention
The present invention completes to solve above-mentioned existing issue, its object is to：It is excellent simultaneously to provide colorrendering quality And visual confirmation when by optical component visual confirmation with polarization is excellent and irregular colour is inhibited Liquid crystal display device.
The means used to solve the problem
The liquid crystal display device of the present invention has：Liquid crystal display panel, the liquid crystal display panel include liquid crystal cells, are configured at the liquid crystal Second polarizer of the first polarizer of the visual confirmation side of unit and the back side for being configured at the liquid crystal cells；Phase separation layer, The phase separation layer is configured at the visual confirmation side of the liquid crystal display panel；And back light, the back light is by back side to the liquid Crystal panel is illuminated.Phase difference Re (550) is 100nm~180nm in the face of phase separation layer, and meets Re (450) ＜ Re (550) relationship of ＜ Re (650).The slow axis of the phase separation layer is 35 °~55 ° with the long side angulation of the liquid crystal display panel. The back light has discrete emission spectrum.
For an embodiment, the wavelength region of the emission spectrum of above-mentioned back light in 430nm~470nm has Peak P1 has peak P2 in the wavelength region of 530nm~570nm, and has peak P3 in the wavelength region of 630nm~670nm. The wavelength of peak P1 is set as λ 1, sets height to hP1 and half-peak breadth is set as Δ λ 1, the wavelength of peak P2 is set as λ 2, it sets height to hP2 and half-peak breadth is set as Δ λ 2, the wavelength of peak P3 is set as to λ 3, sets height to hP3 simultaneously Half-peak breadth is set as Δ λ 3, the height of the paddy between peak P1 and peak P2 is set as to hB1, by the paddy between peak P2 and peak P3 When height is set as hB2, they meet following relational expression (1)~(3)：
(λ 2- λ 1)/(Δ λ 2+ Δs λ 1) ＞ 1 (1)
(λ 3- λ 2)/(Δ λ 3+ Δs λ 2) ＞ 1 (2)
0.8≤{hP2-(hB2+hB1)/2}/hP2≤1 (3)。
For an embodiment, the index ellipsoid of above-mentioned phase separation layer shows the relationship of nx ＞ nz ＞ ny, Nz Coefficient is 0.2~0.8.
For an embodiment, above-mentioned liquid crystal display device is further between liquid crystal display panel and above-mentioned phase separation layer Have other phase separation layers that index ellipsoid shows the relationship of nz ＞ nx >=ny.
For an embodiment, above-mentioned back light includes to send out red LED (Light Emitting Diode；Light emitting diode), send out the LED of green and send out the LED of blue, and the fluorophor for sending out red LED is It is manganese ion activated by tetravalence.For another embodiment, above-mentioned back light includes to send out the LED of blue and comprising quantum The wavelength conversion layer of point.
For an embodiment, the absorption axiss of above-mentioned first polarizer are substantive relative to the long side of above-mentioned liquid crystal display panel Upper orthogonal or parallel, the absorption axiss of above-mentioned second polarizer are substantially orthogonal or parallel relative to the long side of the liquid crystal display panel, should The absorption axiss of first polarizer and the absorption axiss of second polarizer are substantially orthogonal.
Invention effect
According to the embodiment of the present invention, by using the back light with specific emission spectrum and will be with so-called Reverse dispersion wavelength dependency and phase separation layer with phase difference in predetermined surface with specific axis angle configurations in visual confirmation Side can realize that colorrendering quality is excellent and visual confirmation when by optical component visual confirmation with polarization The liquid crystal display device that excellent and irregular colour is inhibited.
Description of the drawings
Fig. 1 is the schematic cross-sectional view of the liquid crystal display device of an embodiment of the invention.
Fig. 2 is the transmitting light for the back light for schematically showing the liquid crystal display device that can be used for embodiment of the present invention The figure of one example of spectrum.
Fig. 3 is the figure of an example of the emission spectrum for schematically showing existing back light.
Specific implementation mode
Hereinafter, the representative embodiments of the present invention are illustrated, 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 of the film obtained using the flash ranging that the wavelength at 23 DEG C is λ nm.For example, " Re (450) " it is phase difference in the face of film obtained using the flash ranging that the wavelength at 23 DEG C is 450nm.It is set by the thickness of film For d (nm) when, Re (λ) is found out by formula Re=(nx-ny) × d.
(3) phase difference (Rth) of thickness direction
" Rth (λ) " is the phase difference of the thickness direction of the film obtained using the flash ranging that the wavelength at 23 DEG C is 550nm.Example Such as, " Rth (450) " are the phase differences of the thickness direction of the film obtained using the flash ranging that the wavelength at 23 DEG C is 450nm.Will be thin When the thickness of film is set as d (nm), Rth (λ) is found out by formula Rth=(nx-nz) × d.
(4) Nz coefficients
Nz coefficients are found out by Nz=Rth/Re.
(5) nx=ny, nx=nz, ny=nz
Nx=ny includes not only the nx situation identical with ny, also includes nx and situation substantially the same ny.Nx= The relationship of nz and ny=nz is also identical.
(6) substantially orthogonal or parallel
The feelings that " substantially orthogonal " and " substantially orthogonal " these statements are 90 ° ± 10 ° comprising both direction angulation Condition, preferably 90 ° ± 7 °, further preferably 90 ° ± 5 °." substantial parallel " and " substantially parallel " these statements include two The case where direction angulation is 0 ° ± 10 °, preferably 0 ° ± 7 °, further preferably 0 ° ± 5 °.In turn, referred to as " just Also it may include substantially orthogonal or substantial parallel state when friendship " or " parallel ".
(7) angle
In this specification, when mentioning angle, as long as not clearly stating especially, then the angle include clockwise and anticlockwise this The angle of both direction.
A. the overall structure of liquid crystal display device
Fig. 1 is the schematic cross-sectional view of the liquid crystal display device of an embodiment of the invention.In figure, for the ease of seeing It examines, the ratio of the thickness of each layer and each optical component is different from material object.The liquid crystal display device 500 of present embodiment has liquid crystal Panel 100, be configured at liquid crystal display panel 100 visual confirmation side phase separation layer 200 and liquid crystal display panel 100 is carried out by back side The back light 300 of illumination.For illustrated example, also it can be further configured between liquid crystal display panel 100 and phase separation layer 200 His phase separation layer 400.According to purpose, composition and desired characteristic etc., other phase separation layers can be also omitted.In addition, for ease of saying It is bright, phase separation layer 200 is known as first phase difference layer sometimes, other phase separation layers 400 are known as second phase difference layer.With regard to this hair For bright embodiment, phase difference Re (550) is 100nm~180nm, preferably 110nm in the face of first phase difference layer 200 ~170nm, further preferably 120nm~160nm, particularly preferably 135nm~155nm.In turn, first phase difference layer 200 Meet the relationship of Re (450) ＜ Re (550) ＜ Re (650).In addition, for embodiments of the present invention, back light 300 has There is discrete emission spectrum.
First polarizer 20 of the liquid crystal display panel 100 comprising liquid crystal cells 10, the visual confirmation side for being configured at liquid crystal cells 10 With the second polarizer 30 of the back side for being configured at liquid crystal cells 10.The absorption axiss of first polarizer 20 are relative to liquid crystal display panel The long side of 100 (liquid crystal cells 10) is substantially orthogonal or parallel.In addition, the absorption axiss of the second polarizer 30 are also relative to liquid crystal surface The long side of plate 100 (liquid crystal cells 10) is substantially orthogonal or parallel.In addition, the long side of liquid crystal display panel may be either to show a left side for picture Right direction or upper and lower directions.The absorption axiss of first polarizer 20 and the absorption axiss of the second polarizer 30 are substantially orthogonal. It can be in the unilateral side of the first polarizer 20 or both sides configuration protective film (not shown).It similarly, also can be in the second polarizer 30 Unilateral or both sides configuration protective film (not shown).
The slow axis of first phase difference layer 200 is 35 °~55 ° with the long side angulation of liquid crystal display panel 100, preferably 38 °~52 °, more preferably 40 °~50 °, further preferably 42 °~48 °, particularly preferably 44 °~46 °, especially preferably About 45 °.Therefore, the absorption axiss angulation of the slow axis of first phase difference layer 200 and the first polarizer 20 be preferably 35 °~ 55 °, more preferably 38 °~52 °, further preferably 40 °~50 °, particularly preferably 42 °~48 °, especially preferably 44 °~ 46 °, most preferably about 45 °.
For an embodiment, also can conductive layer be set between the first polarizer 20 and liquid crystal cells 10 and (not scheme Show).By the way that this conductive layer is arranged, liquid crystal display device, which can be used as, to be assembled in display unit (liquid crystal cells) between polarizer There is the so-called embedded touch control panel type input and display device of touch sensing to function.
It also can be if necessary between the first polarizer 20 and liquid crystal cells 10 and/or the second polarizer 30 and liquid crystal cells 10 Between configure any suitable optical compensating layer (in addition phase separation layer).The configuration quantity of this optical compensating layer, combination, configuration Position, configuration sequence, optical characteristics (such as phase difference, thickness direction phase difference, Nz coefficients in index ellipsoid, face), machinery Characteristic etc. can suitably be set according to purpose, the composition of liquid crystal display device and desired characteristic.
Hereinafter, the inscape (optical thin film, optical component) to liquid crystal display device illustrates.
B. liquid crystal display panel
B-1. liquid crystal cells
The liquid crystal layer as display medium that liquid crystal cells 10 have a pair of of substrate 11,12 and are held between the substrate 13.For routinely constituting, a substrate 11 is provided with colour filter and black matrix, another substrate 12 is provided with control liquid crystal Electro-optic properties switching device, to the switching device provide grid signal scan line and provide source signal signal Line, pixel electrode and counter electrode.The interval (cell gap) of aforesaid substrate 11,12 can be controlled by spacer etc..It can It is arranged such as the alignment films formed by polyimides in the side of aforesaid substrate 11,12 contacted with liquid crystal layer 13.
For an embodiment, liquid crystal layer 13 is included in there is no be orientated to arrange along face in the state of electric field The liquid crystal molecule of (homogeneous alignment).Typically, the refractive index of this liquid crystal layer (result is liquid crystal cells) Ellipsoid shows the relationship of nx ＞ ny=nz.Generation as the drive mode for using this liquid crystal layer for showing three-dimensional refractive index Table example can enumerate plane conversion (IPS) pattern, fringing field switching (FFS) pattern etc..IPS patterns include using V-shape electricity The hyperplane of pole or zigzag electrode etc. converts (Super In-Plane Switching；S-IPS) pattern, advanced hyperplane turn Change (Advanced Super In-Plane Switching；AS-IPS) pattern.FFS mode includes to use V-shape electrode or saw The advanced fringing field of pole etc. switches (Advanced Fringe-Field Switching；A-FFS) pattern, superelevation grade Fringing field switches (Ultra Fringe-Field Switching；U-FFS) pattern.It is this there is no the shapes of electric field with regard to using It is orientated under state for the drive mode (such as IPS patterns, FFS mode) for the liquid crystal molecule that face arranges, there is no tilt Gray inversion, and oblique viewing angle is wide, thus visual confirmation when having the advantages that from inclined direction is excellent such.
For another embodiment, liquid crystal layer 13 is included in there is no be orientated to vertical arrangement in the state of electric field The liquid crystal molecule of (homeotropic alignment).Vertical arrangement is orientated in the state of there is no electric field as using Liquid crystal molecule drive mode, such as vertical orientation (VA) pattern can be enumerated.VA patterns include multidomain VA (MVA) pattern. With regard to the drive mode (such as VA patterns) using this liquid crystal molecule for being orientated to vertical arrangement in the state of there is no electric field For, since the transmissivity of the halftoning of inclined direction is higher than the transmissivity of the halftoning of positive direction, have from inclination side It becomes clear and the less such advantage that blacks to the halftoning observed.
B-2. polarizer
As the first polarizer 20 and the second polarizer 30, any suitable polarizer can be used.First polarizer, 20 He Material, thickness, the optical characteristics etc. of second polarizer 30 both can be identical, also can be different.Hereinafter, sometimes by 20 He of the first polarizer Second polarizer 30 is referred to as polarizer.
The resin film for forming polarizer may be either the resin film or two layers or more of laminated body of single layer.
As the specific example for the polarizer being made of the resin film of single layer, can enumerate to polyvinyl alcohol (PVA) system Film, part formalizing PVA systems film, vinyl-vinyl acetate copolymer pastern divide the hydrophilic macromolecules such as saponified film Film implements substance obtained from the dyeing processing and stretch processing that are carried out using dichroic substances such as iodine, dichroic dyes；PVA The polyenoid system oriented film such as dehydration treatment, the dehydrochlorinated products of polyvinyl chloride etc..From optical characteristics it is excellent in terms of examine Consider, it is preferable to use being dyed to PVA systems film using iodine and polarizer obtained from being uniaxially stretched.
The above-mentioned dyeing carried out using iodine for example can be by carrying out in iodine aqueous solution by PVA systems are 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 be carried out while being dyed It stretches.In addition, can also be dyed after the stretch.Can swelling treatment, crosslinking Treatment, cleaning optionally be implemented to PVA systems film Processing, drying process etc..For example, washed in water before dyeing by PVA systems are thin film dipped, thus not only PVA capable of washing It is spot, the antiblocking agent of film surface, can also makes PVA systems films swell 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 resins (PVA based resin films) of resin base material are formed in the resin base with coating Polarizer obtained from the laminated body of the PVA resins of material.The PVA of the resin base material is formed in coating using resin base material Polarizer obtained from the laminated body of resin can for example make in the following way：PVA systems resin solution is coated on tree Aliphatic radical material is allowed to dry and forms PVA resins on resin base material, thus obtains resin base material and PVA resins Laminated body；The laminated body is stretched and dyed, polarizer is made in PVA resins.For present embodiment, generation It is table to stretch comprising making laminated body be impregnated in boric acid aqueous solution and stretch.In turn, it stretches and 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 the laminated body of base material/polarizer, also can be by resin base Material is removed from the laminated body of resin base material/polarizer, 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 bulletins.The public affairs The whole contents of report are cited as reference to this specification.
The thickness of polarizer is preferably 15 μm hereinafter, more preferably 1 μm~12 μm, further preferably 3 μm~10 μm, special It You Xuanwei not be 3 μm~8 μm.When the thickness of polarizer is this range, curling when can favorably inhibit heating and can obtain To appearance durability when good heating.In turn, when the thickness of polarizer is this range, it can help to liquid crystal display dress The slimming set.
Polarizer preferably shows absorption dichroism under any wavelength of wavelength 380nm~780nm.The monomer of polarizer Transmissivity is preferably 43.0%~46.0%, and more preferably 44.5%~46.0%.The degree of polarization of polarizer is preferably 97.0% More than, more preferably 99.0% or more, further preferably 99.9% or more.
As described above, protective film can be configured in the unilateral side of the first polarizer 20 or both sides, it also can be in the second polarizer 30 Unilateral side or both sides configure protective film.That is, polarizer can also both be wrapped separately as the inscape of liquid crystal display device Inscape of the form of polarizing film containing polarizer and protective film as liquid crystal display device.It in turn, also can be by polarizer The inscape of (i.e. polarizer and protective film difference) as liquid crystal display device is separately laminated with protective film.
Protective film is formed by any suitable film.The concrete example of material as the main component as the film Son can enumerate the cellulose-based resins such as triacetyl cellulose (TAC), Polyester, polyethenol series, polycarbonate-based, polyamides Amine system, polyimides system, polyether sulfone system, polysulfones system, polystyrene, polynorbornene system, polyolefin, (methyl) acrylic acid The transparent resin etc. of system, acetic acid esters system etc..In addition, can also enumerate (methyl) acrylic acid series, carbamate system, (methyl) third The thermohardening type resin of olefin(e) acid carbamate system, epoxy, silicone-based etc. or ultraviolet curing resin etc..In addition, for example Also the nature of glass based polymer such as siloxane-based polymers can be enumerated.In addition, it is possible to use Japanese Unexamined Patent Publication 2001-343529 public affairs Report the thin polymer film recorded in (WO01/37007).As the material of the film, such as can be used containing side chain with through taking The thermoplastic resin and side chain of generation or the imide being unsubstituted have the phenyl and itrile group for being substituted or being unsubstituted The resin combination of thermoplastic resin, such as can enumerate and be total to replacing of being formed by isobutene and N- methylmaleimidos The resin combination of polymers and acrylonitritrile-styrene resin.The thin polymer film may be, for example, above-mentioned resin combination Extrusion molding object.
The thickness of protective film is preferably 20 μm~200 μm, more preferably 30 μm~100 μm, further preferably 35 μm ~95 μm.
It (is protected inside configured with protective film in 10 side of liquid crystal cells of the first polarizer 20 and/or the second polarizer 30 Film) in the case of, which is preferably optical isotropy.In this specification, " optical isotropy " refers to Phase difference Re (550) is 0nm~10nm in face and the phase difference Rth of thickness direction (550) is -10nm~+10nm.
C. first phase difference layer
As described above, phase difference Re (550) is 100nm~180nm, preferably 110nm in the face of first phase difference layer 200 ~170nm, further preferably 120nm~160nm, particularly preferably 135nm~155nm.That is, first phase difference layer can be used as The plates of so-called λ/4 function.Therefore, first phase difference layer has and will be projected to the rectilinearly polarized light of visual confirmation side by polarizer It is converted into the function of elliptically polarized light or circularly polarized light.Thus, the first phase functioned by the way that the plates of λ/4 will be can be used as Poor layer is configured at specific axis relationship as described above and more leans on visual confirmation than visual confirmation side polarizer (the first polarizer 20) Side, just at last the case where showing picture across optical component (such as polarisation sunglasses) visual confirmation with polarization Under, it can also realize excellent visual confirmation.Therefore, liquid crystal display device of the invention can be suitble in outdoor application.
In turn, as described above, first phase difference layer meets the relationship of Re (450) ＜ Re (550) ＜ Re (650).That is, first Phase separation layer shows that phase difference value corresponds to the wavelength dependency of the wavelength for measuring light and increased reverse dispersion.First phase The Re (450) of poor layer/Re (550) is preferably 0.8 less than 1.0, more preferably 0.8~0.95.Re(550)/Re(650) Preferably 0.8 less than 1.0, more preferably 0.8~0.97.
Typically, the refractive index characteristic of first phase difference layer shows the relationship of nx ＞ ny, and has slow axis.As above Described, the absorption axiss angulation of the slow axis of first phase difference layer 200 and the first polarizer 20 is preferably 35 °~55 °, more excellent It is selected as 38 °~52 °, it is further preferably 40 °~50 °, particularly preferably 42 °~48 °, especially preferably 44 °~46 °, optimal It is selected as about 45 °.When the angle is this range, by the way that first phase difference layer is set as the plates of λ/4 and by first phase difference layer It is configured at and more leans on visual confirmation side than the first polarizer (visual confirmation side polarizer), just at last across with polarization In the case that optical component (such as polarisation sunglasses) visual confirmation shows picture, excellent visual confirmation can be also realized. Therefore, liquid crystal display device of the invention can also be suitble in outdoor application.
As long as first phase difference layer has the relationship of nx ＞ ny, any suitable index ellipsoid will be shown.It is preferred that The relationship of nx ＞ nz ＞ ny is shown for the index ellipsoid of first phase difference layer.The Nz coefficients of first phase difference layer are preferably 0.2~0.8, more preferably 0.3~0.7, further preferably 0.4~0.6, particularly preferably about 0.5.By meeting this pass System, have inhibit across the optical component (such as polarisation sunglasses) with polarization from inclined direction when coloring this The advantages of sample.
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.When photoelastic When the absolute value of property coefficient is this range, phase difference variation is not likely to produce in the case where generating shrinkage stress when heating. As a result, can prevent the heat of liquid crystal display device uneven well.
The thickness of first phase difference layer can be set as the mode that the plates of λ/4 can be functioned most suitably. In other words, thickness can obtain the mode of phase difference in desired face and be set.Specifically, thickness is preferably 1 μm~80 μ M, more preferably 10 μm~80 μm, further preferably 10 μm~60 μm, particularly preferably 30 μm~50 μm.
First phase difference layer is formed by any suitable resin that can meet such as above-mentioned characteristic.As formation first phase difference The resin of layer, can enumerate：Polycarbonate resin, polyvinyl acetal resin, cyclic olefine resin, acrylic resin, fibre Dimension plain ester system resin etc..Preferably polycarbonate resin.
As above-mentioned polycarbonate resin, as long as the effect of the present invention can be obtained, so that it may use any suitable poly- carbonic acid Ester resin.It is preferred that polycarbonate resin includes the structural unit for being originated from fluorenes system dihydroxy compounds, from isosorbite system two The structural unit of hydroxy compounds and from be selected from ester ring type glycol, ester ring type dimethanol, diethylene glycol, triethylene glycol or poly- second The structural unit of at least one of the group of glycol and aklylene glycol or spiral shell glycol dihydroxy compounds.It is preferred that makrolon Resin includes structural unit, the structure list from isosorbite system dihydroxy compounds from fluorenes system dihydroxy compounds Member, the structural unit from ester ring type dimethanol and/or the structural unit from diethylene glycol, triethylene glycol or polyethylene glycol, Further preferably comprising structural unit, the knot from isosorbite system dihydroxy compounds from fluorenes system dihydroxy compounds Structure unit and structural unit from diethylene glycol, triethylene glycol or polyethylene glycol.Polycarbonate resin also can include optionally Other are originated from the structural unit of dihydroxy compounds.In addition, the detailed content of the polycarbonate resin of the present invention can be suitable for Such as it is recorded in Japanese Unexamined Patent Publication 2014-10291 bulletins, Japanese Unexamined Patent Publication 2014-26266 bulletins, and the contents are made It is cited to this specification for reference.
The glass transition temperature of polycarbonate resin is preferably 110 DEG C~250 DEG C, more preferably 120 DEG C~230 DEG C. When glass transition temperature is too low, has the tendency that heat resistance variation, change in size may be caused after film forming, or The case where in the presence of the picture quality that can reduce obtained liquid crystal display device.When glass transition temperature is excessively high, there are thin The case where forming stability when film is molded is deteriorated, or there is a situation where that the transparency of film can be damaged.In addition, vitrifying turns Temperature is found out according to JIS K 7121 (1987).
The molecular weight of above-mentioned polycarbonate resin can be indicated by reduced viscosity.Reduced viscosity is measured by following manner 's：Using dichloromethane as solvent, makrolon concentration is accurately adjusted to 0.6g/dL, in 20.0 DEG C ± 0.1 DEG C of temperature It is lower to use Ubbelohde viscometer.The lower limit of reduced viscosity is preferably generally 0.30dL/g, more preferably 0.35dL/g or more.It is more viscous than dense The upper limit of degree is preferably generally 1.20dL/g, more preferably 1.00dL/g, further preferably 0.80dL/g.When reduced viscosity is small When above-mentioned lower limiting value, exists and will produce the case where mechanical strength of molded product reduces this problem.On the other hand, when than dense When viscosity is more than above-mentioned upper limit value, there is mobility when will produce molding reduces, is asked as productivity or mouldability reduction The case where topic.
The phase-contrast film for constituting first phase difference layer for example can be by thin to being formed by above-mentioned polycarbonate-based resin Film is stretched to obtain.As the method for forming film by polycarbonate-based resin, any suitable processing and forming can be used Method.As specific example, 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 (example Such as the tape casting), rolling-molding method, pressure sintering.Preferably extrusion moulding or casting rubbing method.Its reason is：It can be improved The flatness of obtained film obtains good optical homogeneity.Condition of molding can according to the composition of used resin or Characteristic etc. desired by type, phase-contrast film and suitably set.
The thickness of resin film (non-stretched film) can be according to the desired thickness of obtained phase-contrast film, desired Optical characteristics, 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).Specifically, you can by various stretching sides such as free end stretching, fixing end stretching, free end contraction, fixing end contractions Method is used alone, and also can while gradually use.It, also can be in length direction, width direction, thickness for draw direction The various directions such as direction, inclined direction or dimension carry out.
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 coefficients in face) phase-contrast film.
For an embodiment, phase-contrast film is by being uniaxially stretched to resin film or fixing end list Axis stretch and make.As the specific example that fixing end is uniaxially stretched, can enumerate makes resin film along its length on one side It is mobile to be allowed to the method that (transverse direction) stretches in the width direction on one side.Stretching ratio is preferably 1.1 times~3.5 times.
For another embodiment, phase-contrast film can be by making the resin film of strip relative to length direction edge The direction of predetermined angular continuously tilts stretching to make.It is stretched by using tilting, the length side relative to film can be obtained To the strip oriented film of the angle of orientation (with slow axis on the direction of predetermined angular) with predetermined angular, for example, with it is inclined The device that shakes can be roll-to-roll when being laminated, so as to make manufacturing step simplify.In addition, above-mentioned predetermined angular can be in liquid crystal display device The absorption axiss of first polarizer and the slow axis angulation of first phase difference layer.As described above, the angle be preferably 35 °~ 55 °, more preferably 38 °~52 °, further preferably 40 °~50 °, particularly preferably 42 °~48 °, especially preferably 44 °~ 46 °, most preferably about 45 °.
As the stretching-machine for tilting stretching, such as it can enumerate and can assign left and right difference laterally and/or longitudinally upper The conveying capacity or drawing force of speed or the stenter formula stretching-machine of extraction force.Stenter formula stretching-machine, which has, to be laterally uniaxially stretched Machine, synchronous biaxial stretcher etc., as long as strip resin film can be made continuously to tilt stretching, so that it may use any suitable drawing Stretch machine.
For above-mentioned stretching-machine, by appropriately respectively controlling the speed of left and right, it can obtain that there is above-mentioned desired face Interior phase difference and above-mentioned desired direction have slow axis phase-contrast film (being essentially strip phase-contrast film).
As the method for tilting stretching, such as Japanese Unexamined Patent Application 50-83482 bulletins, Japanese Unexamined Patent Publication 2- can be enumerated No. 113920 bulletins, Japanese Unexamined Patent Publication 3-182701 bulletins, Japanese Unexamined Patent Publication 2000-9912 bulletins, Japanese Unexamined Patent Publication 2002- Method recorded in No. 86554 bulletins, Japanese Unexamined Patent Publication 2002-22944 bulletins etc..
The phase-contrast film (i.e. phase-contrast film of the Nz coefficients less than 1.0) that embodiments of the present invention can be properly used for can It is made by following manner：Heat-shrinkable film is fitted in the single or double of resin film across such as acrylic adhesive And laminated body is formed, by the laminated body for stretching as described above.It (such as is shunk by adjusting the composition of heat-shrinkable film Power) and stretching condition (such as draft temperature), the phase-contrast film with desired Nz coefficients can be obtained.
The draft temperature of above-mentioned film can be according to phase difference value in the desired face of phase-contrast film and thickness, 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 Degree is lower to be stretched, and the phase-contrast film with appropriate characteristics can be obtained in the present invention.In addition, Tg is the glass of the constituent material of film Change transition temperature.
It can also be used commercially available film as polycarbonate-based resin film.As the specific example of commercially available product, can enumerate Go out：The trade name " PURE-ACE WR-S " of Di Ren companies manufacture, " PURE-ACE WR-W ", " PURE-ACE WR-M ", day east electricity The trade name " NRF " of work company manufacture.Commercially available film can be used directly, commercially available film can also be carried out according to purpose secondary (such as stretch processing, surface treatment) is processed to use.
D. back light
Back light 300 is contained in back light unit (not shown).Other than light source, back light unit also includes typically Light guide plate, diffusion disk and prismatic lens etc..As described above, back light has discrete emission spectrum." there is discrete hair Penetrate spectrum " refer to being able to there are specific peak and each peak in red (R), green (G) and blue (B) each wavelength region Clearly distinguish.Fig. 2 is the figure for an example for schematically showing discrete emission spectrum.As shown in Fig. 2, back light Wavelength region (blue wavelength region) tool of the emission spectrum in preferably 430nm~470nm, more preferably 440nm~460nm There is peak P1, in wavelength region (green wavelength region) tool of preferably 530nm~570nm, more preferably 540nm~560nm There is peak P2, and in wavelength region (the red wavelength zone of preferably 630nm~670nm, more preferably 640nm~660nm Domain) there is peak P3.The preferably wavelength X 1 of peak P1, height hP1 and half-peak breadth Δ λ 1, the wavelength X 2 of peak P2, height hP2 and half-peak The height hB1 and peak P2 of paddy between wide Δ λ 2, the wavelength X 3 of peak P3, height hP3 and half-peak breadth Δ λ 3, peak P1 and peak P2 with The height hB2 of paddy between peak P3 meets following relational expressions (1)~(3)：
(λ 2- λ 1)/(Δ λ 2+ Δs λ 1) ＞ 1 (1)
(λ 3- λ 2)/(Δ λ 3+ Δs λ 2) ＞ 1 (2)
0.8≤{hP2-(hB2+hB1)/2}/hP2≤1 (3)。
(the λ 2- λ 1) of formula (1)/(Δ λ 2+ Δs λ 1) is more preferably 1.01~2.00, further preferably 1.10~1.50. (the λ 3- λ 2) of formula (2)/(Δ λ 3+ Δs λ 2) is more preferably 1.01~2.00, further preferably 1.10~1.50.Formula (3) { hP2- (hB2+hB1)/2 } is more preferably 0.85~1, further preferably 0.9~1.Formula (1) refers to blue light and green light Relationship is as light source not colour mixture and independence.Formula (2) refers to that the relationship of green light and red light is as light source not colour mixture And it is independent.Formula (3) refers to that the lowest point between peak P1, P2 and P3 is relatively low and the peak of blue light, green light and red light becomes clear Difference.By providing formula (1)~(3), it is such to have the advantages that colorrendering quality improves.Meet formula (1)~formula (3) by having The synergistic effect of the back light 300 of emission spectrum and above-mentioned first phase difference layer 200, it can be achieved that colorrendering quality it is excellent and Visual confirmation when by optical component visual confirmation with polarization is excellent and irregular colour inhibited Liquid crystal display device.For example, (will only send out red light, green with the existing back light with emission spectrum as shown in Figure 3 Coloured light and white light source made of the LED combination of blue light) it compares, colorrendering quality can be made, by the light with polarization Visual confirmation and irregular colour when learning component visual confirmation all significantly improve.
Back light becomes any suitable composition that can be achieved such as above-mentioned emission spectrum.One embodiment is come It says, back light includes to send out red LED, send out the LED of green and send out the LED of blue, and send out red LED's Fluorophor is manganese ion activated by tetravalence.By the fluorophor activation for making to send out red LED, hair shown in Fig. 3 can be reduced The red light penetrated in spectrum is overlapped with green light, to realize emission spectrum as shown in Figure 2.As this by tetravalence The preferred specific example of manganese ion activated red-emitting phosphors can enumerate William M.Yen and Marvin J.Weber Write " INORGANIC PHOSPHORS " (SECTION4 of page 212 published by CRC：PHOSPHOR DATA's 4.10Miscellaneous Oxides) illustrated by Mn4+Activate Mg fluogermanate fluorophor (2.5MgOMgF2：Mn4+) with And Journal of the Electrochemical Society：SOLID-STATE SCIENCE AND TECHNOLOGY、 July 1973, M illustrated by page 9421 2M2F6：Mn4+(M1=Li, Na, K, Rb, Cs；M2=Si, Ge, Sn, Ti, Zr) fluorescence Body.It is for example recorded in Japanese Unexamined Patent Publication 2015-52648 bulletins using the back light of this red-emitting phosphors.In addition, including hair Go out red LED, the back light routinely constituted that sends out the LED of green and send out the LED of blue is for example recorded in Japanese spy Open 2012-256014 bulletins.The contents of these bulletins are cited as reference to this specification.
For another embodiment, back light includes the LED for sending out blue and the wavelength conversion layer comprising quantum dot. When for this composition, a part for the blue light issued by LED is converted into red light and green by wavelength conversion layer A part for light, blue light projects directly in the form of blue light.As a result, it can be achieved that white light.In turn, by suitably Wavelength conversion layer is constituted, it can be achieved that the transmitting light that the peak of red light, green light and blue light defines and the coincidence of white light is small It composes (emission spectrum as shown in Figure 2).
Typically, wavelength conversion layer includes matrix and the quantum dot being scattered in the matrix.As the material for constituting matrix Expect (hereinafter also referred to host material), any suitable material can be used.As this material, resin, organic oxygen can be enumerated Compound, inorganic oxide.Host material is preferably with low oxygen permeability and penetrability, with high photostability and chemical stabilization Property, with regulation refractive index, with the excellent transparency and/or to quantum dot with excellent dispersibility.Consider when synthetically These when, host material is preferably resin.Resin may be either thermoplastic resin or heat-curing resin, can also be activity Energy ray-curable resin (such as electronic beam solidified resin, ultraviolet curing resin, luminous ray gel-type resin). Preferably heat-curing resin or ultraviolet curing resin, more preferably heat-curing resin.Resin can be used alone, and also may be used (such as being blended, copolymerization) is combined to use.
Quantum dot can control the wavelength conversion characteristics of wavelength conversion layer.Specifically, by making that there are the different centres of luminescence The quantum dot of wavelength is appropriately combined use, can form the wavelength conversion layer for realizing the light with desired centre of luminescence wavelength. The centre of luminescence wavelength of quantum dot can be adjusted by material and/or composition, particle size, shape of quantum dot etc..As amount It is sub-, such as it has been known that there is the wave bands of the range in 600nm~680nm, and there is the quantum dot of centre of luminescence wavelength (hereinafter referred to as to measure Son point A), 500nm~600nm range wave band have centre of luminescence wavelength quantum dot (hereinafter referred to as quantum dot B), The wave band of 400nm~500nm has the quantum dot (hereinafter referred to as quantum dot C) of centre of luminescence wavelength.Quantum dot A is excited light (being the light from back light in the present invention) excites and sends out red light, and quantum dot B sends out green light, and quantum dot C sends out indigo plant Coloured light.By making them be appropriately combined, the light (light from back light) of provision wavelengths is made to inject and pass through wavelength convert Layer, may be implemented in desired wave band at this time has the light of centre of luminescence wavelength.
Quantum dot can be made of any suitable material.Quantum dot can be preferably made of inorganic material, more preferably can be by nothing Machine conductor material or inorganic semiconductor material are constituted.As semi-conducting material, such as II-VI group, iii-v, IV- can be enumerated The semiconductor of VI races and IV races.As specific example, can enumerate Si, Ge, Sn, Se, Te, B, C (including diamond), P, BN, BP、BAs、AlN、AlP、AlAs、AlSb、GaN、GaP、GaAs、GaSb、InN、InP、InAs、InSb、ZnO、ZnS、ZnSe、 ZnTe、CdS、CdSe、CdSeZn、CdTe、HgS、HgSe、HgTe、BeS、BeSe、BeTe、MgS、MgSe、GeS、GeSe、GeTe、 SnS、SnSe、SnTe、PbO、PbS、PbSe、PbTe、CuF、CuCl、CuBr、CuI、Si3N4、Ge3N4、Al2O3、(Al、Ga、In)2 (S、Se、Te)3、Al2CO.These can be used alone, and can also be used in combination of two or more.Quantum dot also may include p-type dopant Or n-type dopant.
The size of quantum dot can use any suitable size according to desired emission wavelength.The size of quantum dot is preferred For 1nm~10nm, more preferably 2nm~8nm.When the size of quantum dot is this range, green and red are shown respectively Distinct shines, to realize high-color rendering.For example, green light can be shone with the size of quantum dot for 7nm or so, red light It can be shone with 3nm or so.It is average grain diameter in the case where quantum dot is for example just spherical for the size of quantum dot, It is the size of the minimum axis in the shape in the case of for shape in addition to this.In addition, the shape as quantum dot, it can root Any suitable shape is used according to purpose.As specific example, just spherical, flakey, plate, ellipsoid, no can be enumerated Regular shape.
Quantum dot is relative to 100 parts by weight of host material preferably with the parts by weight of 1 parts by weight~50, more preferably with 2 weight Part~30 parts by weight ratio mixture.When the blend amount of quantum dot is this range, it can be achieved that RGB whole tone balances are excellent Different liquid crystal display device.
The detailed content of quantum dot is for example recorded in Japanese Unexamined Patent Publication 2012-169271 bulletins, Japanese Unexamined Patent Publication 2015- No. 102857 bulletins, Japanese Unexamined Patent Publication 2015-65158 bulletins, Japanese Unexamined Patent Application Publication 2013-544018 bulletins, Japanese Unexamined Patent Application Publication 2013- No. 544018 bulletins, Japanese Unexamined Patent Application Publication 2010-533976 bulletins, and the contents of these bulletins be cited as reference to This specification.Commercially available product can also be used in quantum dot.
The thickness of wavelength conversion layer is preferably 1 μm~500 μm, more preferably 100 μm~400 μm.When wavelength conversion layer When thickness is this range, transfer efficiency and excellent in te pins of durability can be made.
Wavelength conversion layer is configured at the exiting side of LED (light source) in the form of a film in back light unit.
E. second phase difference layer
As described above, the refractive index characteristic of second phase difference layer 400 shows the relationship of nz ＞ nx >=ny.Second phase is poor The phase difference Rth (550) of the thickness direction of layer preferably -260nm~-10nm, more preferably -230nm~-15nm, further Preferably -215nm~-20nm.By second phase difference layer of the setting with this optical characteristics, across with polarization Coloring when optical component (such as polarisation sunglasses) is observed by inclined direction is significantly improved, and as a result can be had The liquid crystal display device of very excellent viewing angle characteristic.
For an embodiment, the refractive index of second phase difference layer shows the relationship of nx=ny.With regard to another implementation For mode, the refractive index of second phase difference layer shows the relationship of nx ＞ ny.Accordingly, there exist second phase difference layers to have slow axis The case where.In this case, the slow axis of second phase difference layer is substantially orthogonal or flat relative to the absorption axiss of the first polarizer 20 Row.In addition, phase difference Re (550) is preferably 10nm~150nm in the face of second phase difference layer, more preferably 10nm~80nm.
Second phase difference layer can be formed by any suitable material.Preferably it is fixed into the liquid crystal layer of vertical orientation.It can hang down The liquid crystal material (liquid-crystal compounds) being directly orientated may be either liquid crystal monomer or liquid crystal polymer.As the liquid-crystal compounds With the specific example of the forming method of the liquid crystal layer, can enumerate [0020] of Japanese Unexamined Patent Publication 2002-333642 bulletins~ [0042] liquid-crystal compounds recorded in and forming method.In this case, thickness is preferably 0.1 μm~5 μm, more preferably 0.2 μm~3 μm.
As other preferred specific examples, second phase difference floor is alternatively by Japanese Unexamined Patent Publication 2012-32784 bulletins institute The phase-contrast film that the dimethyl ester system resin of record is formed.In this case, thickness is preferably 5 μm~80 μm, more preferably It is 10 μm~50 μm.
F. conductive layer
Typically, conductive layer (not shown) is transparent (i.e. conductive layer is transparency conducting layer).By in the first polarizer 20 Conductive layer is formed between liquid crystal cells 10, liquid crystal display device can be used as so-called embedded touch control panel type input and display device It functions.
Conductive layer both can be individually as the composition layer of liquid crystal display device, can also be with laminated body (the band base material of base material Conductive layer) form for liquid crystal display device.In the case where being separately formed by conductive layer, conductive layer can be from being formed with this The base material of conductive layer is transferred to the specified position of liquid crystal display device.
Conductive layer can be optionally patterned.By Butut, conducting portion and insulation division can be formed.As a result electrode can be formed. The touch sensing electrode that electrode can be used as contact of the perception with touch panel functions.Pattern is preferably shaped to as tactile The pattern that control panel (such as electrostatic capacitance method touch panel) works well.As specific example, Japanese spy can be enumerated Table 2011-511357 bulletins, Japanese Unexamined Patent Publication 2010-164938 bulletins, Japanese Unexamined Patent Publication 2008-310550 bulletins, Japan Pattern recorded in special table 2003-511799 bulletins, Japanese Unexamined Patent Application Publication 2010-541109 bulletins.
The total light transmittance of conductive layer is preferably 80% or more, more preferably 85% or more, further preferably 90% or more. For example, when using following conductive nanometer lines, the transparency conducting layer for being formed with opening portion can be formed, to which light transmittance can be obtained High transparency conducting layer.
The density of conductive layer is preferably 1.0g/cm3~10.5g/cm3, more preferably 1.3g/cm3~3.0g/cm3。
The sheet resistance value of conductive layer is preferably 0.1 Ω/sq~1000 Ω/sq, and the Ω of more preferably 0.5 Ω/sq~500/ Sq, further preferably 1 Ω/sq~250 Ω/sq.
As the typical example of conductive layer, the conductive layer comprising metal oxide can be enumerated, comprising conductive nanometer line Conductive layer, the conductive layer comprising metal mesh.Preferably include the conductive layer of conductive nanometer line or the conductive layer comprising metal mesh. Its reason is：Resistance to bend(ing) is excellent, even if bending, electric conductivity is not easy to disappear, therefore can be formed and can be bent well Conductive layer.As a result, liquid crystal display device can be configured to be bent.
Including the conductive layer of metal oxide can by 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.) any suitable Metal oxide film is set to form a film and be formed on base material.As metal oxide, such as indium oxide, tin oxide, oxidation can be enumerated Zinc, indium-tin composite oxides, tin-antimony composite oxides, zinc-aluminium composite oxide, indium-zinc composite oxide.Wherein, preferably For indium-tin composite oxides (ITO).
Including the conductive layer of conductive nanometer line (can be led conductive nanometer line will be made to be scattered in dispersion liquid made of solvent Electrical nanowire dispersion) be coated on any suitable base material after so that coating layer drying is formed.As conductive nanometer Any suitable conductive nanometer line can be used as long as the effect that the present invention can be obtained in line.Conductive nanometer line refers to shape For the conductive material of needle-shaped or linear and a diameter of nano-scale.Conductive nanometer line may be either linear, or bent It is linear.As described above, the resistance to bend(ing) of the conductive layer comprising conductive nanometer line is excellent.In addition, including conductive nanometer line Conductive layer by making conductive nanometer line forms gap by becomes latticed each other, just a small amount of conductive nanometer line at last, Good conductive path can be formed, to which the small conductive layer of resistance can be obtained.In turn, by making conductive nanometer line become grid Shape can form opening portion in the gap of grid and obtain the high conductive layer of light transmittance.As conductive nanometer line, such as can enumerate Go out metal nanometer line made of metal, the conductive nanometer line etc. comprising carbon nanotubes.
The ratio between the fineness degree d and length L of conductive nanometer line (aspect ratios：L/d it is preferably) 10~100000, more preferably 50~100000, further preferably 100~10000.When using aspect ratio so big conductive nanometer line, electric conductivity is received Rice noodles intersect and can express out the electric conductivity higher than a small amount of conductive nanometer line well.As a result, light transmittance can be obtained High conductive layer.In addition, in this specification, " fineness degree of conductive nanometer line " is circular in the section of conductive nanometer line In the case of refer to its diameter, refer to its minor axis for ellipse, refer to longest right for polygon Linea angulata.The fineness degree and length of conductive nanometer line can be carried out by scanning electron microscope or transmission electron microscope Confirm.
The fineness degree of conductive nanometer line is preferably less than 500nm, more preferably less than 200nm, further preferably 1nm ~100nm, particularly preferably 1nm~50nm.When for this range, the high conductive layer of light transmittance can be formed.Conductive nanometer The length of line is preferably 2.5 μm~1000 μm, more preferably 10 μm~500 μm, further preferably 20 μm~100 μm.When for When this range, the high conductive layer of electric conductivity can be obtained.
As the metal for constituting conductive nanometer line (metal nanometer line), as long as the high metal of electric conductivity, so that it may use Any suitable metal.Metal nanometer line is preferably made of the metal selected from one or more of gold, platinum, silver and copper.Wherein, from From the viewpoint of electric conductivity, preferably silver-colored, copper or gold are more preferably silver-colored.In addition, it is possible to use plating has been carried out to above-mentioned metal Handle the material of (such as gold-plated processing).
As carbon nanotubes, any suitable carbon nanotubes can be used.For example, can be used so-called multi-layer nano carbon pipe, Double-layer nanometer carbon tube, single-walled carbon nanotubes etc..Wherein, from electric conductivity it is higher from the aspect of, it is preferable to use single-walled carbon nanotubes.
As metal mesh, as long as the effect of the present invention can be obtained, so that it may use any suitable metal mesh.For example, can make Be formed as latticed metal mesh with the pattern for the metallic wiring layer being set on film substrate.
The detailed content of conductive nanometer line and metal mesh is for example recorded in Japanese Unexamined Patent Publication 2014-113705 bulletins and day This special open 2014-219667 bulletins.The contents of the bulletin are cited as reference to this specification.
The thickness of conductive layer is preferably 0.01 μm~10 μm, more preferably 0.05 μm~3 μm, further preferably 0.1 μm ~1 μm.When for this range, electric conductivity and the excellent conductive layer of translucency can be obtained.In addition, including metal oxygen in conductive layer In the case of compound, the thickness of conductive layer is preferably 0.01 μm~0.05 μm.
G. adhesive phase or adhesive layer
For the stacking of each layer and optical component of the liquid crystal display device for constituting the present invention, it can be used any suitable Adhesive phase or adhesive layer.Typically, adhesive phase is formed by acrylic adhesive.Typically, adhesive layer by Polyethenol series bonding agent is formed.
Embodiment
Hereinafter, the present invention is specifically described by embodiment, but the present invention and it is not limited to the examples restriction.This Outside, the assay method of each characteristic is as described below.As long as in addition, not clearly stating especially, then " part " and " % " in embodiment is Weight basis.
(1) thickness
Using scale rule (PEACOCK companies manufacture, ProductName " DG-205 ", scale advise frame (ProductName " pds-2 ")) into Row measures.
(2) phase difference
The sample of 50mm × 50mm is cut as determination sample from each phase-contrast film and liquid crystal cured layer, and is used The Axoscan of Axometrics companies manufacture is measured.It is 450nm, 550nm to measure wavelength, and measuring temperature is 23 DEG C.
In addition, mean refractive index is measured using the Abbe refractomecer that Ai Tuo companies manufacture, and according to obtained phase Mathematic interpolation goes out refractive index nx, ny, nz.
(3) water absorption rate
It is measured according to " water absorption rates and boiling moisture content test method of plastics " recorded in JIS K 7209.Experiment Piece is the square that size is length of side 50mm, is soaked after so that test film is impregnated 24 hours in the water that water temperature is 25 DEG C by measuring Weight change before and after water is found out.Unit is %.
(4) backlight spectra measures
So that the liquid crystal display device obtained by each embodiment and each comparative example is displayed in white image, and uses Topcon companies The SR-UL1R of manufacture measures emission spectrum.Based on the relevant wavelength X 1 shown in Fig. 2 of obtained emission spectrum, wavelength X 2, Wavelength X 3, height hP1, height hP2, height hP3, height hB1, height hB2, half-peak breadth Δ λ 1, half-peak breadth Δ λ 2 and half-peak breadth Δ λ 3 finds out and below is worth shown in formula (4), (5) and (6).In addition, aobvious when liquid crystal display device being made to be displayed in white image The emission spectrum of the spectrum and back light that show light is roughly equal, therefore the spectrum of display light when being displayed in white image is set For the emission spectrum of back light.
(λ2-λ1)/(Δλ2+Δλ1) (4)
(λ3-λ2)/(Δλ3+Δλ2) (5)
{hP2-(hB2+hB1)/2}/hP2 (6)
(5) visual confirmation is evaluated
The liquid crystal display device obtained by each embodiment and each comparative example is set to be displayed in white image, and based on the following benchmarks Visual confirmation when to observing image by polarisation sunglasses is evaluated.
Well coloring and rainbow spot are not generated
Bad generation coloring
<Embodiment 1>
(making for constituting the phase-contrast film A of first phase difference layer)
Have gathering in batches for the vertical reactor of stirrer paddle and control at 100 DEG C of reflux condenser using comprising two It attaches together to set and be polymerize.By 9,9- [4- (2- hydroxyl-oxethyls) phenyl] fluorenes (BHEPF), isosorbite (ISB), diethylene glycol (DEG), diphenyl carbonate (DPC) and magnesium acetate 4 hydrate are 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.It is sufficiently carried out nitrogen in reactor It after displacement (oxygen concentration be 0.0005~0.00 volume %), is heated by thermal medium, and at the time of temperature becomes 100 DEG C inside Start to stir.Start that interior temperature is made to reach 220 DEG C after forty minutes in heating, and controlled in a manner of keeping the temperature, simultaneously Start to depressurize, is arranged to 13.3kPa within 90 minutes after reaching 220 DEG C.The phenol vapor of the by-product together with polymerisation is imported It, will be uncooled if the monomer component comprising dry measure in phenol vapor is made to be back to reactor to 100 DEG C of reflux condenser Phenol vapor is directed into 45 DEG C of condenser and recycling.
After nitrogen is directed into first reactor and temporarily reverts to atmospheric pressure, by first reactor through oligomer The reaction solution of change is transferred to second reactor.Then, the heating and decompression in second reactor are proceeded by, was arranged at 50 minutes It is 240 DEG C, pressure 0.2kPa at interior temperature.Thereafter, the polymerization is continued until reaching regulation stirring power.Reaching regulation power Moment introduces nitrogen into reactor and carries out multiple pressure, and reaction solution is taken out in the form of strands, and utilization rotary cutting machine into Row pelletizing batch obtains the polycarbonate resin 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.Make obtained makrolon After resin is dried in vacuo 5 hours at 80 DEG C, using having single screw extrusion machine, (Isuzu Motors chemical industry machine company manufactures, and screw rod is straight Diameter is 25mm, barrels set temperature：220 DEG C), T die heads (width 900mm, set temperature：220 DEG C), chill roll (setting temperature Degree：125 DEG C) and coiling machine film film forming apparatus, it is 70 μm of polycarbonate resin film to make thickness.Obtained poly- carbon The water absorption rate of acid ester resin film is 1.2%.Obtained polycarbonate resin film single shaft at 133 DEG C is set to be drawn into 2.0 Times, thus obtain phase-contrast film A (thickness is 50 μm).The Re (550) of obtained phase-contrast film A is 140nm, Rth (550) it is 140nm, Re (450)/Re (550) is 0.89.
(making of polarizer)
Prepare A-PET (amorphous-polyethylene terephthalate) film, (Mitsubishi Plastics Inc's manufacture, commodity Name：200 μm of NOVACLEAR SH046) it is used as base material, and sided corona treatment (58W/m is implemented to surface2/ minute).On the other hand, Preparing the acetoacetyl modified PVA added with 1 weight %, (the Nippon Synthetic Chemical Industry Co., Ltd manufactures, trade name： GOHSEFIMER Z200 (degree of polymerization 1200, saponification degree are 99.0% or more, acetoacetyl modified degree is 4.6%)) PVA (degree of polymerization 4200, saponification degree 99.2%) is applied in such a way that the film thickness after drying becomes 12 μm on base material, It is allowed to 10 minutes dry by heated-air drying under 60 DEG C of atmosphere, is thus produced on the layer for being provided with PVA resins on base material Stack.
Then, make the laminated body first in air at 130 DEG C along the directions MD (Machine direction；It is longitudinal) 2.0 times are drawn into, generates and stretches laminated body.Then, following processes are carried out：The boron for being 30 DEG C in liquid temperature by the way that laminated body will be stretched It is impregnated 30 seconds in the insoluble aqueous solution of acid, keeps the PVA layers after PVA molecularly oriented included in stretching laminated body insoluble.It should The boric acid for including 3 parts by weight relative to 100 parts by weight of water is made with boric acid aqueous solution in insoluble in process.By to by not The stretching laminated body for dissolving process is dyed, and coloring laminated body is generated.The coloring laminated body will be by that will stretch laminated body leaching Stain makes PVA layers of absorption iodine included in stretching laminated body in dyeing liquor.Dyeing liquor includes iodine and potassium iodide, dyeing liquor Liquid temperature is set as 30 DEG C, in the range of iodine concentration is set as 0.08~0.25 weight %, potassium iodide is dense using water as solvent Degree is set as in the range of 0.56~1.75 weight %.The concentration ratio of iodine and potassium iodide is set as 1 pair 7.As dyeing condition, with The mode that the independent transmissivity (single transmission) for constituting the PVA resins of polarizer is 40.9% sets iodine Concentration and dip time.
Then, following processes are carried out：It is impregnated 60 seconds in 30 DEG C of crosslinking boric acid aqueous solution by the way that laminated body will be coloured, The PVA molecules of PVA layers to being adsorbed with iodine implement crosslinking Treatment each other.Crosslinking boric acid aqueous solution used in the cross-linking process step Boric acid content is set as 3 parts by weight relative to 100 parts by weight of water, iodate potassium content is set as 3 relative to 100 parts by weight of water Parts by weight.In turn, following stretchings are carried out：Make obtained coloring laminated body in boric acid aqueous solution, at 70 DEG C of draft temperature So that final stretching ratio is become 5.4 times along being drawn into 2.7 times with the identical direction of stretching in air before, obtains Include the optical film laminate of test polarizer.Boric acid aqueous solution used in the stretching process is opposite by boric acid content It is set as 4.0 parts by weight in 100 parts by weight of water, iodate potassium content is set as 5 parts by weight relative to 100 parts by weight of water.By institute Obtained optical film laminate takes out from boric acid aqueous solution, and includes 4 parts by weight of iodinated using relative to 100 parts by weight of water The aqueous solution of potassium cleans the boric acid on the surface for being attached to PVA layers.The drying process carried out by using 60 DEG C of hot winds Cleaned optical film laminate is set to dry, the polarizer that the thickness for obtaining being laminated in PET film is 5 μm.
(making of the polarizing film with phase separation layer)
For polarizer obtained in the above-described manner, the polarizer that the thickness to being laminated in PET film is 5 μm, across UV(Ultraviolet；Ultraviolet light) curing type bonding agent by above-mentioned phase-contrast film A with the absorption axiss of its slow axis and polarizer The mode that angle essentially becomes 45 ° is fitted in PET as on the face of opposite side.In turn, PET film is shelled from the laminated body From obtaining the polarizing film with phase separation layer.
(making of liquid crystal display device)
By liquid crystal display panel, from the smart mobile phone for the liquid crystal display device for having IPS modes, (Sony Corporation manufactures XperiaZ4： The emission spectrum of back light be it is discontinuous) liquid crystal display device in take out, the visual confirmation side of liquid crystal cells will be configured at Polarizing film removal, and the glass surface of the liquid crystal cells is cleaned.Next, across acrylic adhesive, (thickness is 20 μm) by the face of the polarizer side of the above-mentioned polarizing film with phase plate with the absorption axiss of polarizer relative to the liquid crystal cells Initial orientation direction becomes orthogonal mode, and (slow axis of first phase difference layer and the long side angulation of liquid crystal display panel become 45 °, the long side angulation of the absorption axiss of polarizer and liquid crystal display panel become 0 ° of mode) be laminated in above-mentioned liquid crystal cells The surface of visual confirmation side, obtains liquid crystal display panel.The back light unit of above-mentioned smart mobile phone is installed on and is laminated with band phase plate Polarizing film above-mentioned liquid crystal display panel, the liquid crystal display device as the present embodiment.The liquid crystal display device is set to be displayed in white figure Picture, and the visual confirmation by polarisation sunglasses is evaluated under white image state.Will evaluation result is shown in table 1。
<Embodiment 2>
(making for constituting the phase-contrast film B of first phase difference layer)
The polycarbonate resin (10kg) obtained in the same manner as example 1 is set to be dissolved in dichloromethane (73kg), Prepare birefringent layers forming material.Next, (being longitudinally uniaxially stretched polypropylene film, Tokyo ink strain formula in shrink film Commercial firm manufactures, trade name " Noblen ") on be directly coated with above-mentioned birefringent layers forming material, make its film in 30 DEG C of drying temperature Lower drying 5 minutes, it is 5 minutes dry at 80 DEG C, form the laminated body of shrink film/birefringent layers.It is drawn using twin shaft simultaneously Stretching machine makes obtained laminated body be stretched along the directions MD to shrink multiplying power 0.80 at 155 DEG C of draft temperature, and along the side TD To (Transverse Direction；1.3 times laterally) are drawn into, thus forms phase-contrast film B on shrink film.It connects Get off, phase-contrast film B is removed from shrink film.
Obtain phase-contrast film B in the above-described manner (thickness is 60 μm).The Re (550) of obtained phase-contrast film B is 140nm, Rth (550) are 70nm, and Re (450)/Re (550) is 0.89.The slow-axis direction of phase-contrast film B is relative to length side To being 90 °.
(making of polarizing film and liquid crystal display device with phase separation layer)
Other than using above-mentioned phase-contrast film B to replace phase-contrast film A, make in the same manner as example 1 Polarizing film with phase separation layer makes in the same manner as example 1 other than using the polarizing film with phase separation layer Liquid crystal display device.The liquid crystal display device is set to be displayed in white image, and to passing through polarisation sun eye under white image state The visual confirmation of mirror is evaluated.It will be evaluation result is shown in table 1.
<Embodiment 3>
(making for constituting the liquid crystal cured layer of second phase difference layer)
By following chemical formula (I), (number 65 and 35 in formula indicates mole % of monomeric unit, for ease of illustration and with embedding Section polymer indicates：Weight average molecular weight be 5000) shown in 20 parts by weight of side chain liquid crystalline polymer, display Nematic liquid crystalline phase Polymerizable liquid crystal (BASF AG manufacture：Trade name Paliocolor LC242) 80 parts by weight and Photoepolymerizationinitiater initiater (vapour bar Refine company manufacture：Trade name Irgacure 907) 5 parts by weight are dissolved in and prepare liquid crystal coating in 200 parts by weight of cyclopentanone Liquid.Next, by rod coater by the coating solution in base film (norbornene resin film：The auspicious father-in-law of Japan Co., Ltd. manufactures, trade name " ZEONEX "), then heat drying 4 minutes at 80 DEG C, thus make liquid crystal aligning.To the liquid Crystal layer irradiates ultraviolet light and makes curable liquid crystal layer, and the liquid crystal cured layer of second phase difference layer is thus formed on base film (thickness：1.10μm).The Re (550) of the liquid crystal cured layer is 0nm, and Rth (550) is -100nm, shows nz ＞ nx=ny's Refractive index characteristic.
(making of the polarizing film with phase separation layer)
To the laminated body of the PET film and polarizer that obtain in the same manner as example 1, it is bonded across UV curing types Agent by above-mentioned liquid crystal cured layer base film to be removed when base film peeling direction and polarizer absorption axiss essence It is on the face of opposite side that upper parallel mode, which is fitted in PET film,.In turn, above-mentioned base film is removed, and solid across UV Change type bonding agent is by the phase-contrast film A made in the same manner as example 1 with the absorption axiss of its slow axis and polarizer Angle is essentially that 45 ° of mode fits in the side opposite with polarizer of liquid crystal cured layer.In turn, by PET film from After laminated body stripping, it is bonded acrylic acid series protective film across UV curing type bonding agents or is optionally bonded phase separation layer, Make the polarizing film with phase separation layer.
(making of liquid crystal display device)
Other than using the above-mentioned polarizing film with phase separation layer and using the smart mobile phone for having different back lights, Liquid crystal display device is made in the same manner as example 1.The liquid crystal display device is set to be displayed in white image, and in white print As being evaluated the visual confirmation by polarisation sunglasses under state.It will be evaluation result is shown in table 1.
<Embodiment 4>
(making for constituting the phase-contrast film C of first phase difference layer)
After being dried in vacuo the polycarbonate resin obtained in the same manner as example 15 hours at 80 DEG C, make With having single screw extrusion machine, (Isuzu Motors chemical industry machine company manufactures, screw diameter 25mm, barrels set temperature：220℃)、T Die head (width 900mm, set temperature：220 DEG C), chill roll (set temperature：125 DEG C) and coiling machine film film dress It sets, makes the polycarbonate resin film that thickness is 130 μm.The water absorption rate of obtained polycarbonate resin film is 1.2%.
Keep above-mentioned polycarbonate resin thin by the method for the embodiment 1 according to Japanese Unexamined Patent Publication 2014-194483 bulletins Film, which tilts, to be stretched, and phase-contrast film C is obtained.
The specific production order of phase-contrast film C is as described below：By polycarbonate resin film, (thickness is 130 μm, width For 765mm) in the preheated zone of stretching device it is preheated to 142 DEG C.In preheated zone, the fixture spacing of the fixture controlled is 125mm.Then, film is put into first and tilts stretch zones C1, start simultaneously at the fixture spacing for increasing right side fixture, the One inclination stretch zones C1 increases to 177.5mm from 125mm.Fixture spacing change rate is 1.42.Stretch zones are tilted first C1 starts the fixture spacing of left side fixture to reduce fixture spacing, is allowed to tilt stretch zones C1 from 125mm reductions first To 90mm.Fixture spacing change rate is 0.72.In turn, film is put into second and tilts stretch zones C2, start simultaneously at increase The fixture spacing of left side fixture is allowed to increase to 177.5mm from 90mm in the second inclination stretch zones C2.On the other hand, right side The fixture spacing of fixture is maintained 177.5mm in the second inclination stretch zones C2.In addition, simultaneously also existing with above-mentioned inclination stretching 1.9 times of stretching is carried out in width direction.It is carried out in addition, above-mentioned inclination is stretching at 135 DEG C.Then, it is carried out in constriction zone MD shrink process.Specifically, the fixture spacing of left side fixture and right side fixture is made to be reduced from 177.5mm to 165mm.MD is received Shrinking percentage in contracting processing is 7.0%.
Obtain phase-contrast film C in the above-described manner (thickness is 40 μm).The Re (550) of obtained phase-contrast film C is 140nm, Rth (550) are 168nm, and Re (450)/Re (550) is 0.89.The slow-axis direction of phase-contrast film C is relative to length side To being 45 °.
(making of polarizing film and liquid crystal display device with phase separation layer)
Other than using above-mentioned phase-contrast film C to replace phase-contrast film A, make in the same manner as example 1 Polarizing film with phase separation layer makes in the same manner as example 1 other than using the polarizing film with phase separation layer Liquid crystal display device.The liquid crystal display device is set to be displayed in white image, and to passing through polarisation sun eye under white image state The visual confirmation of mirror is evaluated.It will be evaluation result is shown in table 1.
<Comparative example 1>
(making for constituting the phase-contrast film D of first phase difference layer)
Across acrylic adhesive layer (thickness be 15 μm) by biaxial stretch-formed polypropylene film (the beautiful manufacture in east, trade name " Torayfan " (thickness be 60 μm)) fit in the both sides of commercially available ARTON films (JSR companies manufacture, and thickness is 70 μm).Its Afterwards, it keeps the length direction of film using roller stretching machine and is allowed to be stretched in 147 DEG C of air circulating type constant temperature oven 1.45 times and obtain phase-contrast film D.The Re (550) of obtained phase-contrast film D is 140nm, and Rth (550) is 70nm, Re (450)/Re (550) is 1.00.
(making of polarizing film and liquid crystal display device with phase separation layer)
Other than using above-mentioned phase-contrast film D to replace phase-contrast film A, make in the same manner as example 1 Polarizing film with phase separation layer makes in the same manner as example 1 other than using the polarizing film with phase separation layer Liquid crystal display device.The liquid crystal display device is set to be displayed in white image, and to passing through polarisation sun eye under white image state The visual confirmation of mirror is evaluated.It will be evaluation result is shown in table 1.
<Comparative example 2>
(making for constituting the phase-contrast film E of first phase difference layer)
To commercially available ARTON films (JSR companies manufacture, and thickness is 100 μm), the length of film is kept using roller stretching machine Direction, and be allowed to be stretched to 1.8 times and obtain phase-contrast film E in 147 DEG C of air circulating type constant temperature oven.It is obtained The Re (550) of phase-contrast film E is 140nm, and Rth (550) is 140nm, and Re (450)/Re (550) is 1.00.
(making of the polarizing film with phase separation layer)
Other than using above-mentioned phase-contrast film E, the polarization with phase separation layer is made in the same manner as example 1 Piece.
(making of liquid crystal display device)
From the smart mobile phone for the liquid crystal display device for having IPS modes, (Apple companies manufacture iphone5：Back light Emission spectrum is continuous) liquid crystal display device in take out liquid crystal display panel, the inclined of the visual confirmation side of liquid crystal cells will be configured at The piece that shakes removes, and the glass surface of the liquid crystal cells is cleaned.Next, across acrylic adhesive (thickness is 20 μm) By the face of the polarizer side of the above-mentioned polarizing film with phase plate with the absorption axiss of polarizer relative to the initial of the liquid crystal cells Differently- oriented directivity is the surface for the visual confirmation side that orthogonal mode is laminated in above-mentioned liquid crystal cells, to obtain liquid crystal display panel.It will The above-mentioned liquid crystal display panel for being laminated with the polarizing film with phase plate is installed on above-mentioned smart mobile phone and as the liquid crystal of the present embodiment Display device.The liquid crystal display device is set to be displayed in white image, and to passing through polarisation sunglasses under white image state Visual confirmation is evaluated.It will be evaluation result is shown in table 1.
<Comparative example 3>
(making for constituting the phase-contrast film F of first phase difference layer)
Phosgene used as carbonate precursor substance, bis- (the 4- hydroxyls of (A) 2,2- as aromatic dicarboxylic phenol ingredient Phenyl) propane and (B) 1,1- bis- (4- hydroxy phenyls) -3,3,5- trimethyl-cyclohexanes, and obtained (A) according to conventional method：(B) Weight ratio be 4：6 and include weight average molecular weight (Mw) be 60000 following chemical formula (II) and (III) repetitive unit Polycarbonate-based resin [number-average molecular weight (Mn)=33000, Mw/Mn=1.78].By 70 weight of above-mentioned polycarbonate-based resin Phenylethylene resin series [number-average molecular weight (Mn)=716, Mw/Mn=1.78] (Sanyo that part and weight average molecular weight (Mw) are 1300 It is melted into the HIMER SB75 of manufacture) 30 parts by weight are added to 300 parts by weight of dichloromethane, and mixing 4 hours is stirred at room temperature And obtain transparent solution.By on the solution-cast to glass plate, and removed from glass plate after placing 15 minutes at room temperature, 10 minutes dry in 80 DEG C of baking oven, 20 minutes dry at 120 DEG C, it is 40 μm, glass transition temperature thus to obtain thickness (Tg) macromolecule membrane for being 140 DEG C.Light transmittance of the obtained macromolecule membrane in the case where wavelength is 590nm is 93%.In addition, Phase difference value Re (590) is 5.0nm in the face of above-mentioned macromolecule membrane, and the phase difference value Rth (590) of thickness direction is 12.0nm.Mean refractive index is 1.576.
Obtained macromolecule membrane is uniaxially stretched to 1.5 times in 150 DEG C of air circulating type constant temperature oven and is obtained To phase-contrast film F.The Re (550) of obtained phase-contrast film F is that 140nm, Rth (550) are 140nm, Re (450)/Re (550) it is 1.06.
(making of polarizing film and liquid crystal display device with phase separation layer)
Other than using above-mentioned phase-contrast film F to replace phase-contrast film A, make in the same manner as example 1 Polarizing film with phase separation layer makes in the same manner as example 1 other than using the polarizing film with phase separation layer Liquid crystal display device.The liquid crystal display device is set to be displayed in white image, and to passing through polarisation sun eye under white image state The visual confirmation of mirror is evaluated.It will be evaluation result is shown in table 1.
Industrial availability
The present invention liquid crystal display device can be suitable for portable data assistance (PDA), mobile phone, clock and watch, digital camera, The business automation equipments such as the portable devices such as portable game machine, computer monitor, laptop, duplicator, video camera, The household electric appliances such as LCD TV, micro-wave oven, rearview indicator, auto-navigation system display, automobile audio etc. are vehicle-mounted With the guards equipment such as presentation devices, the monitoring displays such as equipment, commercial store information display, nursing display, The various uses such as the nursing such as medical display, Medical Devices.
Symbol description
10 liquid crystal cells
11 substrates
12 substrates
13 liquid crystal layers
20 first polarizers
30 second polarizers
100 liquid crystal display panels
200 phase separation layers (first phase difference layer)
300 back lights
400 other phase separation layers (second phase difference layer)
500 liquid crystal display devices

Claims (7)

1. a kind of liquid crystal display device, has：
Liquid crystal display panel, first polarizer of the liquid crystal display panel comprising liquid crystal cells, the visual confirmation side for being configured at the liquid crystal cells With the second polarizer of the back side for being configured at the liquid crystal cells；
Phase separation layer, the phase separation layer are configured at the visual confirmation side of the liquid crystal display panel；And
Back light, the back light illuminate the liquid crystal display panel by back side,
Wherein, phase difference Re (550) is 100nm~180nm in the face of the phase separation layer, and meets Re (450) ＜ Re (550) The relationship of ＜ Re (650),
The slow axis of the phase separation layer is 35 °~55 ° with the long side angulation of the liquid crystal display panel,
The back light has discrete emission spectrum.
2. liquid crystal display device as described in claim 1, wherein the emission spectrum of the back light is in 430nm~470nm Wavelength region there is peak P1, there is peak P2 in the wavelength region of 530nm~570nm, and in the wavelength of 630nm~670nm Region has peak P3,
The wavelength of peak P1 is being set as λ 1, set height to hP1 and half-peak breadth is set as Δ λ 1, is setting the wavelength of peak P2 It is set to λ 2, sets height to hP2 and half-peak breadth is set as Δ λ 2, the wavelength of peak P3 is set as to λ 3, is set height to HP3 and half-peak breadth is set as Δ λ 3, the height of the paddy between peak P1 and peak P2 is set as to hB1, will be between peak P2 and peak P3 The height of paddy when being set as hB2, they meet following relational expression (1)~(3)：
(λ 2- λ 1)/(Δ λ 2+ Δs λ 1) ＞ 1 (1)
(λ 3- λ 2)/(Δ λ 3+ Δs λ 2) ＞ 1 (2)
0.8≤{hP2-(hB2+hB1)/2}/hP2≤1 (3)。
3. liquid crystal display device as claimed in claim 1 or 2, wherein the index ellipsoid of the phase separation layer shows nx The relationship of ＞ nz ＞ ny, Nz coefficients are 0.2~0.8.
4. liquid crystal display device according to any one of claims 1 to 3, in the liquid crystal display panel and the phase separation layer Between be further equipped with other phase separation layers that index ellipsoid shows the relationship of nz ＞ nx >=ny.
5. liquid crystal display device as described in any one of claims 1 to 4, wherein the back light includes to send out red LED, send out the LED of green and send out the LED of blue, and the fluorophor for sending out red LED is by tetravalence manganese ion Activation.
6. liquid crystal display device as described in any one of claims 1 to 4, wherein the back light includes to send out blue LED and wavelength conversion layer comprising quantum dot.
7. such as liquid crystal display device according to any one of claims 1 to 6, wherein the absorption axiss phase of first polarizer Substantially orthogonal or parallel for the long side of the liquid crystal display panel, the absorption axiss of second polarizer are relative to the liquid crystal display panel Long side it is substantially orthogonal or parallel, the absorption axiss of first polarizer and the absorption axiss of second polarizer are substantially orthogonal.
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KR20180084818A (en) 2018-07-25
TWI709769B (en) 2020-11-11

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