CN108845451A - Liquid crystal display device, polarizer and polaroid protective film - Google Patents
Liquid crystal display device, polarizer and polaroid protective film Download PDFInfo
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- CN108845451A CN108845451A CN201810708067.9A CN201810708067A CN108845451A CN 108845451 A CN108845451 A CN 108845451A CN 201810708067 A CN201810708067 A CN 201810708067A CN 108845451 A CN108845451 A CN 108845451A
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- protective film
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- polarizer
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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
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/133528—Polarisers
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
- G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
- G02B5/3033—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid
-
- 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
- G02F1/133635—Multifunctional compensators
-
- 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
- G02F2413/00—Indexing scheme related to G02F1/13363, i.e. to birefringent elements, e.g. for optical compensation, characterised by the number, position, orientation or value of the compensation plates
- G02F2413/12—Biaxial compensators
-
- 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
- G02F2413/00—Indexing scheme related to G02F1/13363, i.e. to birefringent elements, e.g. for optical compensation, characterised by the number, position, orientation or value of the compensation plates
- G02F2413/14—Negative birefingence
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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)
- Polarising Elements (AREA)
- Liquid Crystal (AREA)
- Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
- Polyesters Or Polycarbonates (AREA)
Abstract
Liquid crystal display device, polarizer and the polaroid protective film that the rainbow spot in the polaroid protective film for using oriented polyester films as both 1 pair of polarizers can be inhibited to generate are provided.A kind of liquid crystal display device; it is with back light, 2 polarizers and the liquid crystal cells being configured between 2 polarizers; the polarizer is the composition that polaroid protective film is laminated on polarizing film, and the polaroid protective film for being configured at the polaroid protective film of the incident light side of the polarizer of incident light side and being configured at the emergent light side of the polarizer of emergent light side is the oriented polyester films of retardation and 1.7 Nz coefficients below with 4000~30000nm.
Description
The application be the applying date be on 07 29th, 2013, application No. is 2013800408404, entitled " liquid crystal
The divisional application of the application of display device, polarizer and polaroid protective film ".
Technical field
The present invention relates to liquid crystal display devices.Specifically, it is related to rainbow spot and generates improvedd liquid crystal display device.
Background technique
Polarizer used in liquid crystal display device (LCD) is usually by 2 polaroid protective film clamping iodine to poly- second
The composition for the polarizing film that enol (PVA) etc. has dyed is thin usually using Triafol T (TAC) as polaroid protective film
Film.In recent years, require polarizer thin layer with the slimming of LCD.However, thus and be thinned as protective film TAC it is thin
When the thickness of film, it may occur that enough mechanical strengths can not be obtained, and the problem of penetrability deterioration.In addition, TAC film is very high
It is expensive, cheap substitution raw material are needed strongly.
Therefore, it for the thin layer purpose of polarizer, proposes and replaces TAC film using polyester film, so that conduct
Polaroid protective film is able to maintain the method (Patent Documents 1 to 3) of high-durability thickness is thin.
Polyester film excellent in te pins of durability compared with TAC film, but different from TAC film, due to birefringence,
When being used as polaroid protective film, there are problems that causing image quality to reduce because of optical distortion.That is, the polyester with birefringence
Film is due to defined optical anisotropy (retardation), when accordingly acting as polaroid protective film, if from oblique,
Rainbow shape color spot can be generated, image quality reduces.Therefore, it in Patent Documents 1 to 3, uses by using copolyester as poly-
Ester reduces the countermeasure of retardation.However, cannot be completely eliminated rainbow shape color spot in this case.
Existing technical literature
Patent document
Patent document 1：Japanese Unexamined Patent Publication 2002-116320 bulletin
Patent document 2：Japanese Unexamined Patent Publication 2004-219620 bulletin
Patent document 3：Japanese Unexamined Patent Publication 2004-205773 bulletin
Patent document 4：WO2011-162198
Summary of the invention
Problems to be solved by the invention
As the means to solve the above problems, the inventors of the present invention, which have found, uses white light-emitting diode as backlight light
Source further uses the oriented polyester films with certain retardation as polaroid protective film (patent document 4).However, hair
Bright people etc. further studies the liquid crystal display device with above-mentioned composition repeatedly, as a result, it has been found that there are following new issues：Even if
Executed as described above improvement liquid crystal display device, when both 1 pair of polarizers use polyester film as polaroid protective film,
If according to angle, there are still generate rainbow spot from oblique.Therefore, major subjects of the invention are, are using
Rainbow spot is inhibited to generate when the polaroid protective film of both 1 pair of polarizer of the oriented polyester films as liquid crystal display device.
The solution to the problem
The present inventor has carried out research day and night to the above problem, as a result, it has been found that：It is used as polarizing film by control to protect
The retardation of the oriented polyester films of cuticula and | ny-nz |/| ny-nx | shown in characteristic as Nz coefficient, can be effective
Ground inhibits the rainbow spot when polaroid protective film for using polyester film as both 1 pair of polarizers of liquid crystal display device to generate.
The present invention is the invention completed based on the result that above-mentioned opinion is further studied and improved.
The representative present invention is as follows.
1st
A kind of liquid crystal display device with back light, 2 polarizers and is configured between aforementioned 2 polarizers
Liquid crystal cells,
Backlight light source is the white light source with continuous luminous spectrum,
Aforementioned polarizer is to be laminated with the composition of polaroid protective film in the two sides of polarizing film,
It is configured at least one of the polaroid protective film of the polarizer of incident light side and is configured at the inclined of emergent light side
At least one of the polaroid protective film of tabula rasa is retardation and 1.70 Nz coefficients below with 4000~30000nm
Oriented polyester films.
2nd
The liquid crystal display device according to the 1st, wherein aforementioned arrangements are in the incident light side of the polarizer of incident light side
Polaroid protective film and aforementioned arrangements in the emergent light side of the polarizer of emergent light side polaroid protective film be with
The oriented polyester films of the retardation of 4000~30000nm and 1.7 Nz coefficients below.
3rd
According to liquid crystal display device described in the 1st or the 2nd, wherein the planar orientation degree of oriented polyester films is 0.13
Below.
4th
The liquid crystal display device according to the 1st~any one of the 3rd, wherein aforementioned that there is continuous luminous light
The white light source of spectrum is white light-emitting diode.
5th
It is a kind of using the white light source with continuous luminous spectrum as the liquid crystal display device polarizer of back light,
Constituting for polaroid protective film is laminated with by the two sides in polarizing film to be formed,
At least unilateral polaroid protective film is retardation and 1.7 Nz coefficients below with 4000~30000nm
Oriented polyester films.
6th
Using the white light source with continuous luminous spectrum as the liquid crystal display device of back light according to the 5th
With polarizer, wherein the planar orientation degree of aforementioned oriented polyester films is 0.13 or less.
7th
It is a kind of to be protected the white light source with continuous luminous spectrum as the polarizer for LCD device of back light
Cuticula, it includes the oriented polyester films of retardation and 1.7 Nz coefficients below with 4000~30000nm.
8th
Using the white light source with continuous luminous spectrum as the liquid crystal display device of back light according to the 7th
With polaroid protective film, which is characterized in that the planar orientation degree of aforementioned oriented polyester films is 0.13 or less.
9th
Using the white light source with continuous luminous spectrum as the liquid crystal of back light according to the 7th or the 8th
Display device polaroid protective film, wherein aforementioned oriented polyester films have adhesive layer.
10th
Using the white light source with continuous luminous spectrum as backlight according to the 7th~any one of the 9th
The polarizer for LCD device protective film of light source, wherein aforementioned oriented polyester films are at least constituted by 3 layers, in outermost layer
Contain ultraviolet absorbing agent in layer in addition, the light transmittance of 380nm is 20% or less.
The effect of invention
Liquid crystal display device of the invention has excellent visuality due to inhibiting rainbow spot to generate.In addition, this hair
Bright liquid crystal display device can make it possible using oriented polyester films as the polaroid protective film of both 1 pair of polarizers
And it is led to the problem of without rainbow spot.Therefore, the present invention makes in the state of keeping the abundant mechanical strength of liquid crystal display device into one
The slimming of step is possibly realized, and then makes it possible to reduce manufacturing cost.In turn, polarizer of the invention and polarizing film protection
What film made liquid crystal display device of the invention is manufactured as possibility.
Specific embodiment
1. liquid crystal display device
In general, liquid crystal display device plays display image side (visible side or outgoing from the side opposite with back light
Light side) successively it is made of module below, liquid crystal cells and prior module.Module and prior module are usually by transparent base below
Plate, the transparent conductive film for being formed in one side surface of liquid crystal cells and the polarizer for being configured at its opposite side are constituted.Wherein, partially
Tabula rasa is configured at the side opposite with back light below in module, be configured at the side of display image in module in front
(visible side or emergent light side).
2. back light
Liquid crystal display device of the invention includes at least back light, two polarizers and is configured at two polarizers
Between liquid crystal cells as member of formation.Liquid crystal display device of the invention can also suitably have than that described above its
His member of formation, such as colour filter, lens coating, diffusion disk, antireflection film etc..
For the composition of backlight, it can be the sidelight mode for making light guide plate, reflecting plate etc. as member of formation, be also possible to
Full run-down type mode.Present invention preferably uses the white light sources with continuous and wider luminescent spectrum as liquid crystal display device
Back light.Wherein, continuous and wider luminescent spectrum refers in at least wavelength region of 450nm~650nm, preferably visible
The luminescent spectrum for the wavelength that intensity in the region of light there is no light is zero.There is continuous and wider luminescent spectrum as this
White light source, for example, White LED, but not limited to this.
White LED workable for the present invention includes the element that white is issued by fluorophor mode, organic light-emitting diodes
Manage (Organic light-emitting diode；OLED) etc., the fluorophor mode will use the hair of compound semiconductor
The light emitting diode of blue light or ultraviolet light is combined with fluorophor out.As fluorophor, for example, yttroalumite pomegranate
Yellow fluorophor, yellow fluorophor of terbium aluminium garnet class of stone class etc..Even if in White LED, by chemical combination will be used
What the light-emitting component that the blue LED of object semiconductor is combined with yttrium-aluminium-garnet class yellow fluorophor was formed
White light-emitting diode has continuous and wider luminescent spectrum, and luminous efficiency is also excellent, therefore is suitable for as the present invention
Back light.Since the power consumption of White LED is smaller, also contributed to using its liquid crystal display device of the invention
Energy-saving.
It is widely used as the fluorescent tubes such as cold-cathode tube, the thermionic-cathode tube of back light so far with luminescent spectrum in specific wavelength
Discontinuous luminescent spectrum with peak.Accordingly, it is difficult to obtain the desired effect of the present invention, it is not preferable as of the invention
The light source of liquid crystal display device.
3. polaroid protective film
The composition that there are polarizer the two sides for the polarizing film that iodine is infected on PVA etc. to be laminated with two polaroid protective films.
For polarizer used in the present invention, at least one in two polaroid protective films uses the retardation for meeting particular range
And | ny-nz |/| ny-nx | shown in physical property as Nz coefficient oriented polyester films.
3-1. retardation
Oriented polyester films used in polaroid protective film used in the present invention preferably have 4000~30000nm's
Retardation.This is because interference colours are presented when liquid crystal display device from oblique, usually can not when retardation is lower than 4000nm
Ensure good visuality.The preferred retardation of oriented polyester films be 4500nm or more, secondly preferably 5000nm or more, into
One step is preferably 6000nm or more, more preferably 8000nm or more, is still more preferably 10000nm or more.
The upper limit of the retardation of oriented polyester films is 30000nm.This is because even if using having higher retardation
Oriented polyester films, substantially can not also obtain further visual improvement, with the rising of retardation, film
Thickness also becomes relatively thicker, and the operability as industrial materials reduces.
The value of the retardation of oriented polyester films can measure the refractive index and thickness of biaxially oriented according to well known method
And it finds out.In addition, commercially available automatic such as also can be used KOBRA-21ADH (Oji Scientific Instruments)
Double refraction detection device measures.
As shown in patent document 4, use any polaroid protective film of the oriented polyester films only as 1 pair of polarizer
When, the retardation of oriented polyester films is controlled into the range in 3000~30000nm, using with continuous and wider luminous light
The white light source of spectrum is as light source, so as to inhibit rainbow spot to generate.Its principle thinks as following.
That is, if polarizing film one-sided configuration have birefringence oriented polyester films, from polarizing film project it is straight
Linearly polarized light can generate disorder when passing through polyester film.Moreover, the light penetrated shows the birefringence and thickness of polyester film
Product, that is, retardation specific to interference colours.Therefore, if using cold-cathode tube, thermionic-cathode tube etc. that there is discontinuous hair as light source
The light source of light spectrum then shows different transmitted intensities according to wavelength, and rainbow shape color spot is presented.
In contrast, having in at least wavelength region of 450nm~650nm, preferably in visible light region continuous and wider
If luminescent spectrum light through birefringence body, interference colours Spectrum Formation envelope shape.Therefore, by controlling polyester film
Retardation, spectrum similar with the luminescent spectrum of light source can be obtained.It is thus regarded that by make the luminescent spectrum of light source with by
Similar shape is formed through the envelope shape for the interference color spectrum that the transmitted light of birefringence body generates, to not generate rainbow shape
Color spot, visuality significantly improve.
However, as described above, if using oriented polyester films as polaroid protective film in 1 pair of polarizer the two,
Sometimes it still can observe that rainbow spot generates.The present invention makes it possible inhibition that rainbow spot as above generates, and principle is not yet sufficiently explained
It is bright.
3-2.Nz coefficient
For oriented polyester films used in polaroid protective film, | ny-nz |/| ny-nx | shown in Nz coefficient it is preferred
It is 1.7 or less.Nz coefficient can be found out as follows.Use molecularly oriented meter (Oji Scientific Instruments system
Make, MOA-6004 type molecularly oriented meter) find out the orientation axis direction of film, utilize Abbe refractometer (ATAGO CO., LTD.
Manufacture, NAR-4T, measurement wavelength 589nm) come find out orientation axis direction and orthogonal to that direction twin shaft refractive index (ny,
Nx, wherein ny>) and the refractive index of thickness direction (nz) nx.As above nx, ny, nz for finding out are substituted into | ny-nz |/| ny-nx
| shown in formula, can be in the hope of Nz coefficient.
If the Nz coefficient of oriented polyester films is more than 1.7, from oblique when liquid crystal display device, may be due to angle
Generate rainbow spot.Nz coefficient is more preferably 1.65 or less, further preferably 1.63 or less.The lower limit value of Nz coefficient is 1.2.This is
Because obtaining film of the Nz coefficient lower than 1.2 to be difficult in manufacturing technology.In addition, the mechanical strength in order to keep film,
The lower limit value of Nz coefficient is preferably 1.3 or more, more preferably 1.4 or more, further preferably 1.45 or more.
The configuration of 3-3. polaroid protective film
In liquid crystal display device of the invention, the oriented polyester films with above-mentioned specific retardation and Nz coefficient
It is used as the polaroid protective film of both 1 pair of polarizers.1 pair of polarizer refers to relative to liquid crystal configurations in the polarisation of incident light side
Plate with relative to liquid crystal configurations in the combination of the polarizer of emergent light side.That is, the oriented polyester films are for the inclined of incident light side
The polarizer of tabula rasa and both polarizers of emergent light side.The oriented polyester films may be used as constituting two of each polarizer partially
At least one in vibration piece protective film, it can be used for above-mentioned two.
In a preferred embodiment, which is used as the incident light side of the polarizer of incident light side
Polaroid protective film, and it is used as the polaroid protective film of the emergent light side of the polarizer of emergent light side.Merely comprise the two of polarizer
When opening use oriented polyester films of polaroid protective film, another can be used arbitrary polaroid protective film (example
Such as, TAC film etc.).According to the oriented polyester films as the polarizer for being configured at incident light side liquid crystal cell side it is inclined
Vibration piece protective film and be configured at emergent light side polarizer liquid crystal cell side polaroid protective film, then exist make liquid crystal list
A possibility that polarized light property variation of member, therefore it is preferable to use the oriented polyester films for the polaroid protective film in above-mentioned position
Polaroid protective film in addition is (for example, using TAC film, acrylic film, norborneol alkenes film as the free of birefringence of representative
Film).
3-4. surface orientation coefficient
On the basis of above-mentioned particular range, also pass through by the delay magnitude of oriented polyester films and the control of Nz coefficient
Planar orientation degree shown in (nx+ny)/2-nz is set as particular value hereinafter, can more reliably completely eliminate in both 1 pair of polarizers
Use rainbow spot of the polyester film as polaroid protective film when.Wherein, the value of nx, ny and nz utilize side identical with Nz coefficient
Method acquires.The planar orientation degree of oriented polyester films is preferably 0.13 or less, is more preferably 0.125 or less, is more preferably
0.12 or less.By making planar orientation degree 0.13 hereinafter, because of angle when can completely eliminate the liquid crystal display device from oblique
And the rainbow spot observed.Planar orientation degree is preferably 0.08 or more, more preferably 0.10 or more.When planar orientation degree is lower than 0.08, have
When film thickness change, the value of retardation becomes uneven in pellicular front.
3-5. retardation ratio
The retardation (Re) of oriented polyester films and the ratio (Re/Rth) of thickness direction retardation amount (Rth) be preferably 0.2 with
Upper, more preferably 0.5 or more, further preferably 0.6 or more.This is because：Above-mentioned retardation and thickness direction retardation amount
Bigger than (Re/Rth), birefringent effect more increases isotropism, it is difficult to the rainbow shape color caused by generating because of viewing angle
Spot.In complete uniaxiality (mono-symmetry) film, the ratio (Re/Rth) of above-mentioned retardation and thickness direction retardation amount becomes
2.However, as be described hereinafter, as close to complete uniaxiality (mono-symmetry) film, the machinery in the direction orthogonal with differently- oriented directivity is strong
Degree significantly reduces.
Therefore, the upper limit of the ratio (Re/Rth) of retardation and the retardation of thickness direction is preferably 1.2 or less, is more preferably
1 or less.The generation of rainbow shape color spot caused by order to completely inhibit because of viewing angle, above-mentioned retardation and thickness direction phase
The ratio (Re/Rth) of difference does not need to be 2, below 1.2 enough.In addition, even if above-mentioned ratio 1.0 hereinafter, can also be abundant
Meet field angle characteristic required by liquid crystal display device (left and right 180 degree, upper and lower 120 degree or so).
3-6. uneven thickness
In order to inhibit oriented polyester films retardation variation, the uneven thickness of preferred film is smaller.From above-mentioned viewpoint
It sets out, the uneven thickness of oriented polyester films is preferably 5% or less, is more preferably 4.5% or less, is still more preferably
4% or less, it is particularly preferably 3% or less.
3-7. thickness
The thickness of oriented polyester films is not particularly limited as long as long as interfering effect of the invention, usually 15~
300 μm, preferably 15~200 μm.When film thickness is lower than 15 μm, the anisotropy of the mechanical characteristic of film becomes significant, sometimes
Generation splits, breakage etc..The lower limit of particularly preferred thickness is 25 μm.On the other hand, if the upper limit of the thickness of polaroid protective film
More than 300 μm, then the thickness of polarizer becomes blocked up without preferred.Go out from the viewpoint of the practicability as polaroid protective film
Hair, the upper limit of thickness is preferably 200 μm.The upper limit of particularly preferred thickness is 100 μm with conventional TAC film equal extent.
3-8. polyester resin
Oriented polyester films used in the present invention can be obtained by arbitrary polyester resin.For the type of polyester resin
It is not particularly limited, arbitrary polyester resin obtained from being condensed dicarboxylic acids and glycol can be used.
As workable dicarboxylic acid component in the manufacture of polyester resin, for example,：Terephthalic acid (TPA), isophthalic two
Formic acid, phthalic acid, 2,5- naphthalene dicarboxylic acids, 2,6 naphthalene dicarboxylic acid, 1,4- naphthalene dicarboxylic acids, 1,5- naphthalene dicarboxylic acids, diphenyl carboxylic
Acid, diphenoxyethanedicarboxylic acid, diphenyl sulfone carboxylic acid, anthracene dicarboxylic acids, 1,3- cyclopentane dicarboxylic acid, 1,3- hexamethylene dicarboxyl
Acid, 1,4- cyclohexane dicarboxylic acid, hexahydro terephthalic acid, hexahydro M-phthalic acid, malonic acid, dimethyl malonic acid, succinic acid,
3,3- diethyl succinic acid, glutaric acid, 2,2- dimethylated pentanedioic acid, adipic acid, 2- methyl adipic acid, trimethyladipic acid, heptan
Diacid, azelaic acid, dimeric dibasic acid, decanedioic acid, suberic acid, dodecanedicarboxylic acid etc..
As workable diol component in the manufacture of polyester resin, for example,：Ethylene glycol, propylene glycol, six Asias
Methyl glycol, neopentyl glycol, 1,2- cyclohexanedimethanol, 1,4 cyclohexane dimethanol, decamethylene glycol, 1,3- propylene glycol,
Bis- (4- hydroxy phenyl) propane of 1,4- butanediol, 1,5- pentanediol, 1,6-HD, 2,2-, bis- (4- hydroxy phenyl) sulfones etc..
For constituting dicarboxylic acid component and the diol component of polyester resin, can be used any one kind or two or more.As
The suitable polyester resin of polyester film is constituted, for example,：Polyethylene terephthalate, poly terephthalic acid third
Diol ester, polybutylene terephthalate (PBT), polyethylene naphthalate etc. can more preferably be enumerated：Poly terephthalic acid
Glycol ester, polyethylene naphthalate, these can also further contain other copolymer compositions.The transparency of these resins
It is excellent, and thermal characteristics, mechanical property are also excellent, can easily control retardation by stretch process.In particular, poly- to benzene
Naphthalate can relatively easily obtain big retardation greatly due to inherently birefringent the thickness of film is thin,
It therefore is optimum raw material.
3-9. light transmittance
From the viewpoint of the deterioration for inhibiting the optical functionals pigments such as the iodine pigment contained by polarizing film, it is generally desirable to,
The light transmittance of the wavelength 380nm of oriented polyester films is 20% or less.The light transmittance of 380nm is more preferably 15% or less, into one
Step preferably 10% or less, particularly preferably 5% or less.If aforementioned light transmittance be 20% hereinafter, if can inhibit optics function
Energy property pigment goes bad because of caused by ultraviolet light.Light transmittance is the value measured relative to the plane of film with vertical process, can be with
It is measured using spectrophotometer (for example, Hitachi's U-3500 type).
By being suitable for the type for adjusting the ultraviolet absorbing agent of compounding, concentration and the thickness of film, orientation can be made poly-
The light transmittance of the wavelength 380nm of ester film controls below 20%.For ultraviolet absorbing agent used in the present invention, Ke Yishi
Preferably select well known ultraviolet absorbing agent come using.As specific ultraviolet absorbing agent, the suction of organic ultraviolet light can be enumerated
Agent and inorganic UV absorber are received, from the viewpoint of the transparency, preferred organic ultraviolet absorbing agent.
As organic ultraviolet absorbing agent, can enumerate：Benzotriazole, benzophenone and cyclic imide base ester
Class etc. and their combination, there is no particular limitation as long as the range in absorbance given to this invention.However, from resistance to
From the perspective of long property, particularly preferred benzotriazole, cyclic imide base ester class.It is inhaled ultraviolet light of more than two kinds is applied in combination
When receiving agent, since the ultraviolet light of respective wavelength can be absorbed simultaneously, it can further improve ultraviolet radiation absorption effect.
As benzophenone ultraviolet absorbent, Benzotriazole Ultraviolet Stabilizer and vinyl cyanide ultraviolet light
Absorbent, for example,：2- [2 '-hydroxyls -5 '-(methacryloxymethyl) phenyl] -2H- benzotriazole, 2-
[2 '-hydroxyls -5 '-(methacryloxyethyl) phenyl] -2H- benzotriazole, 2- [2 '-hydroxyls -5 '-(methacryloxypropyl
Base propyl) phenyl] -2H- benzotriazole, 2,2 '-dihydroxy -4,4 '-dimethoxy-benzophenone, 2,2 ', 4,4 '-tetrahydroxys two
Benzophenone, 2,4- di-t-butyl -6- (5- chlorobenzotriazole -2- base) phenol, 2- (2 '-hydroxyls -3 '-tert-butyl -5 '-methylbenzene
Base) -5- chlorobenzotriazole, 2- (5- chlorine (2H)-benzotriazole -2- base) -4- methyl -6- (tert-butyl) phenol, 2,2 '-methylene
Bis- (4- (1,1,3,3- tetramethyl butyl) -6- (2H- benzotriazole -2- base) phenol etc..As cyclic imide base ester class ultraviolet light
Absorbent, for example,：2,2 '-(1,4- phenylenes) bis- (4H-3,1- benzoxazine -4- ketone), 2- methyl -3,1- benzo
Oxazine -4- ketone, 2- butyl -3,1- benzoxazine -4- ketone, 2- phenyl -3,1- benzoxazine -4- ketone etc..Above-mentioned ultraviolet radiation absorption
Agent can be used only a kind, two or more can also be applied in combination.
When being compounded ultraviolet absorbing agent in oriented polyester films, oriented polyester films are made to 3 layers or more of multilayer knot
Structure, the middle addition ultraviolet absorbing agent of layer (that is, middle layer) other than the outermost layer of film is preferred.
3-10. other compositions etc.
Other than ultraviolet absorbing agent, containing each in the range for not interfering effect of the invention, oriented polyester films
Kind additive is also preferred mode.As additive, for example,：Inorganic particle, heat resistance polymeric particles, alkali gold
Belong to compound, alkaline earth metal compound, phosphorus compound, antistatic agent, photostabilizer, fire retardant, heat stabilizer, antioxidant, resist
Gelling agent, surfactant etc..In addition, in order to play high transparency, it is also preferred that being substantially free of particle in polyester film.It is " basic
Without particle " refer to：For example, in the case where inorganic particle, it is when being quantified using x-ray fluorescence analysis to inorganic elements
50ppm or less, preferably 10ppm or less, particularly preferably detectable limit content below.
4. adhesive layer
In the present invention, in order to improve the cementability with polarizing film, preferably have in at least single side of oriented polyester films
At least one kind of in polyester resin, polyurethane resin or polyacrylics is made into adhesive layer as main component.Wherein,
" main component " refers to the ingredient in the solid component for constituting adhesive layer for 50 mass % or more.It is used to form of the invention easy
The coating fluid of adhesive layer preferably comprises water-soluble or water dispersible copolymer polyester resin, acrylic resin and polyurethane tree
At least one kind of aqueous coating fluid in rouge.As above-mentioned coating fluid, for example,：No. 3567927 public affairs of Japanese Patent No.
Report, No. 3589233 No. 3589232 bulletins of Japanese Patent No., Japanese Patent No. bulletins, Japanese Patent No. No. 3900191 bulletins, days
Water solubility disclosed in No. 4150982 bulletin of this patent etc. or water dispersible copolymer polyester resin solution, acrylic resin
Solution and polyurethane resin solution etc..
Above-mentioned coating fluid can be by being coated on the single side of non-stretched film or longitudinal single axle drawn membrane by adhesive layer
Or it is two-sided after, it is dry at 100~150 DEG C, further stretch and obtain in the width direction.The coating weight of final adhesive layer
It is preferably controlled to 0.05~0.2g/m2.If coating weight is lower than 0.05g/m2, then the cementability sometimes with obtained polarizing film can not
Sufficiently.On the other hand, if coating weight is more than 0.2g/m2, then resistance to blocking can reduce sometimes.On the two sides of polyester film, setting is easy
When adhesive layer, the coating weight of the adhesive layer on two sides can be the same or different, can each independently within the above range
Setting.
Particle is added in adhesive layer preferred to easy slip is assigned.It is 2 μm it is preferable to use the average grain diameter of particle
Particle below.If the average grain diameter of particle is more than 2 μm, particle is easy to fall off from coating.As containing in adhesive layer
Particle, for example,：Titanium oxide, barium sulfate, calcium carbonate, calcium sulfate, silica, aluminium oxide, talcum, kaolin,
The inorganic particles such as clay, calcium phosphate, mica, hectorite, zirconium oxide, tungsten oxide, lithium fluoride, calcirm-fluoride, phenylethylene, propylene
Organic polymers species particle such as acids, melamine class, benzocarbamidine amine, organic silicon etc..These can be added separately to
In adhesive layer, it can also combine and add two or more.
Coating fluid can be used well known method and be coated.For example,：Reverse roll coating method, gravure coating process,
Engagement rubbing method, roller brush method, spraying coating method, air knife coating method, wire rod rubbing method, tubular type scraper (pipe doctor)
Method etc..These methods can carry out alone or in combination.
The measurement of the average grain diameter of above-mentioned particle can carry out by the following method.With scanning electron microscope (SEM)
It takes pictures to particle, the multiplying power for being 2~5mm with the smallest particle 1 size measures the maximum gauge of 300~500 particles
(distance between farthest 2 points), using its average value as average grain diameter.
In order to make to become well with the cementability of polarizing film, oriented polyester films can also be implemented with sided corona treatment, coating
Processing, flame treatment etc..
5. functional layer
In the polarizer that the present invention uses, for reflection-proof, inhibition dazzle, inhibition damage etc., and in oriented polyester table
Various functions layers are arranged, i.e. selected from by hard conating, antiglare layer, anti-reflection layer, low reflection layer, anti-low reflection layer and counnter attack in face
The functional layer for penetrating one or more of group of antiglare layer composition is also preferred mode.When various functions layers are arranged, oriented polyester
Film preferably has adhesive layer on its surface.At this point, from the viewpoint of the interference for inhibiting to be generated by reflected light, it preferably will be easy
The refractive index of adhesive layer adjusts near the geometrical mean of the refractive index to the refractive index of functional layer and oriented polyester films.It is easy to stick
Connect the refractive index of layer adjustment can using well known method, such as can by contain in binder resin titanium, zirconium, other
Metallics adjusts to be easy to carry out.
6. the manufacturing method of oriented polyester films
Oriented polyester films as protective film of the invention can be manufactured according to the manufacturing method of normal polyester film.Example
Following method can such as be enumerated：Polyester resin is melted, makes the No yield point polyester of extrusion molding sheet in glass transition temperature
Du or more at a temperature of, after being longitudinally stretched using the speed difference of roller, transversely stretched through stenter, implement heat treatment.
Oriented polyester films of the invention can be single axle drawn membrane, be also possible to biaxially oriented film, and twin shaft is drawn
When stretching film as polaroid protective film, it should be noted that do not see rainbow shape from the surface from pellicular front
Color spot, but sometimes from oblique when can be appreciated that rainbow shape color spot.
The reason of generating the phenomenon be：Biaxially oriented film is by having difference in direction of travel, width direction, thickness direction
The refractive index Elliptical circle of refractive index is formed, and is penetrated direction according to the light inside film, is zero (refractive index Elliptical there are retardation
Circle appears as positive round) direction.Therefore, if from slanting specific direction liquid crystal display picture, generate sometimes
As a result the point that retardation is zero generates rainbow shape color spot in concentric circles centered on the point.Then, by from pellicular front just on
Birefringent bigger angle, θ when the angle of side (normal direction) to the position that can see rainbow shape color spot is denoted as θ, in pellicular front
It is bigger, it is less susceptible to see rainbow shape color spot.Since biaxially oriented film is there are the tendency that angle, θ becomes smaller, it is uniaxially stretched
Film less easily sees rainbow shape color spot, therefore it is preferred that.
However, complete mechanical strength of uniaxiality (mono-symmetry) film in the direction orthogonal with differently- oriented directivity significantly drops
Low, it is not preferable.The present invention preferably in the range of not generating rainbow shape color spot or required by liquid crystal display picture substantially
Not generated in the range of rainbow shape color spot in visual field scope has biaxiality (twin shaft symmetry).Such twin shaft symmetry is
As obtained from manufacturing oriented polyester films under conditions of following.
For the oriented polyester films with above-mentioned specific retardation and Nz coefficient, when can be film-made by adjusting
Condition (for example, thickness etc. of stretching ratio, draft temperature, film) obtains.For example, stretching ratio is higher, draft temperature is lower,
The thickness of film is thicker, is more easy to get high latency amount.On the other hand, stretching ratio is lower, and draft temperature is higher, the thickness of film
Degree is thinner, is more easy to get low latency amount.
As specific film forming condition, for example, longitudinal drawing temperature and transverse drawing temperature be preferably 80~145 DEG C,
Particularly preferably 90~140 DEG C.Longitudinal stretching multiplying power is preferably 1.0~3.5 times, particularly preferably 1.0 times~3.0 times.In addition,
Cross directional stretch multiplying power is preferably 2.5~6.0 times, particularly preferably 3.0~5.5 times.
In order to by retardation control in above-mentioned specific range, preferably control longitudinal stretching multiplying power and cross directional stretch multiplying power
Ratio.If the difference of stretching ratio in length and breadth is too small, retardation is difficult to get higher, and it is not preferable.In addition, for improve retardation and
Draft temperature is set to lower be also preferred by speech.The temperature of subsequent heat treatment is preferably 100~250 DEG C, is particularly preferably
180~245 DEG C.
In order to make Nz coefficient become above-mentioned specific value, the ratio of longitudinal stretching multiplying power and cross directional stretch multiplying power is preferably controlled
Rate most preferably becomes single axle drawn membrane.In addition, in order to reduce Nz coefficient, it is also preferred that addition copolymer composition is to improve polymer
Molecular weight, reduce crystallinity.It further, can be by suitably in order to control the Nz coefficient of film in specific range
Set total stretching ratio, draft temperature and carry out.Such as total stretching ratio is lower, draft temperature is higher, more available low Nz
Coefficient.
In order to make planar orientation degree become above-mentioned particular value, total stretching ratio is preferably controlled.If total stretching ratio is higher, face
The degree of orientation becomes excessively high, and it is not preferable.In addition, for reducing planar orientation degree, it is also preferred that control draft temperature.Pass through increase
The difference of longitudinal stretching multiplying power and cross directional stretch multiplying power sets low total stretching ratio, sets high draft temperature, can make Nz system
Number, planar orientation degree become particular value or less.
Since draft temperature and stretching ratio generate large effect to the uneven thickness of film, from uneven thickness
From the perspective of, it is also preferred that the optimization of condition is filmed.Longitudinal stretching multiplying power is reduced especially for retardation is improved,
Sometimes longitudinal thickness unevenness is deteriorated.A certain specific range presence due to longitudinal thickness unevenness in stretching ratio can become very
The region of difference, it is therefore desirable that setting film forming condition in the case where deviateing the range.
Ultraviolet absorbing agent can combine well known method to the compounding of oriented polyester films to implement.For example, can lead to
Following methods etc. are crossed to be compounded：Mixing extruder is used in advance, and dried ultraviolet absorbing agent is mixed with polymer raw material
Masterbatch is made, mixes with polymer raw material the defined masterbatch in forming thin film.
For the ultraviolet absorbing agent concentration of above-mentioned masterbatch, in order to keep ultraviolet absorbing agent evenly dispersed and economically carry out
Compounding, is preferably set to the concentration of 5~30 mass %.As the condition for preparing masterbatch, it is preferable to use mixing extruder, squeezes out temperature
Degree squeezes out more than the fusing point of polyester raw material, at 290 DEG C of temperature below with 1~15 minute.At 290 DEG C or more, ultraviolet light
The weightlessness of absorbent is big, increases in addition, the viscosity of masterbatch reduces.In 1 minute extrusion below, ultraviolet absorbing agent it is uniform
Mixing becomes difficult.At this point, also can according to need addition stabilizer, hue adjustment agent, antistatic agent.
For being compounded ultraviolet absorbing agent in the middle layer of the oriented polyester films of the multilayered structure more than tool haves three layers,
It can be implemented by gimmick below.Well known melting stacking extrusion is supplied separately to by the pellet of polyester as outer layer
Machine, as middle layer with will the masterbatch containing ultraviolet absorbing agent and polyester pellet mix, dry in defined ratio after, confession
Well known melting stacking extruder is awarded, squeezes out slabbing from the die head of slit-shaped, solidification is allowed to cool on casting roll and is come
Make non-stretched film.That is, using 2 or more extruders, 3 layers of manifold or interflow block (such as with square merging part
Collaborate block), stacking constitutes the film layer of two outer layers, constitutes the film layer of middle layer, and 3 layers of piece is squeezed out from tube head, uses casting roll
Cooling is to make non-stretched film.
In order to remove the foreign matter for leading to contain in optics bad point, raw material polyester, preferably in the system of oriented polyester films
During making, high-precision filtration is carried out in melting extrusion.The filtering of filter material used in the high-precision filtration of molten resin
Particle size (exhibits initial filtration efficiency 95%) is preferably 15 μm or less.If the filtering particle size of filter material is more than 15 μm, 20 μm with
On the removal of foreign matter be easy to become inadequate.
[embodiment]
Hereinafter, being more specifically illustrated referring to embodiment to the present invention, but the present invention is not by the limit of following embodiments
System, can also be suitably changed in the range of meeting purport of the invention to implement, these embodiments are all contained in this
In the protection scope of invention.
Physical property in embodiment evaluation method is as follows.
(1) retardation (Re)
Retardation refer to the anisotropy (△ Nxy=| nx-ny |) of the refractive index with the orthogonal twin shaft on film with it is thin
Parameter defined in the product (△ Nxy × d) of film thickness d (nm) is to show optical isotropism and anisotropic scale.
The anisotropy (△ Nxy) of the refractive index of twin shaft is found out using the following method.Use molecularly oriented meter (Oji Scientific
Instruments manufacture, MOA-6004 type molecularly oriented meter) the orientation axis direction of film is found out, become length to be orientated axis direction
The mode on side cuts out the rectangle of 4cm × 2cm, as test sample.For the sample, Abbe refractomecer (ATAGO is used
CO., LTD. manufacture, NAR-4T, measurement wavelength 589nm) the orthogonal twin shaft of measurement refractive index (nx, ny) and thickness direction
Refractive index (Nz), the anisotropy (△ by the refractive index absolute value of the difference of aforementioned twin shaft (| nx-ny |) as refractive index
Nxy).The thickness d (nm) of film is measured using electric micrometer (Feinpruf GmbH manufacture, Millitron 1245D),
By unit conversion at nm.It is found out according to the anisotropy (△ Nxy) of refractive index and the product (△ Nxy × d) of the thickness d (nm) of film
Retardation (Re).
(2) Nz coefficient
Will be by | ny-nz |/| ny-nx | obtained value is used as Nz coefficient.Wherein, with ny>The mode of nx select ny and
The value of nx.
(3) planar orientation degree (△ P)
Planar orientation degree (△ P) will be used as by the obtained value of (nx+ny)/2-nz.
(4) thickness direction retardation amount (Rth)
When thickness direction retardation amount refers to from film thickness directional profile 2 birefringence △ Nxz (=| nx-
Nz |), △ Nyz (=| ny-nz |) respectively multiplied by the parameter of the average value of display delay amount obtained from film thickness d.Using with
The same method of the measurement of retardation finds out nx, ny, nz and film thickness d (nm), calculates (△ Nxz × d) and (△ Nyz × d)
Average value find out thickness direction retardation amount (Rth).
(5) rainbow spot is observed
Unilateral in the polarizing film formed by PVA and iodine attaches the polyester film made of aftermentioned method, so that polarizing film
Polarizing axis and the orientation main shaft of polyester film become vertical, in one side attaching TAC film (the Fujiphoto strain formula of its opposite side
Commercial firm's manufacture, 80 μm of thickness) make polarizer.It clips liquid crystal and respectively configures one under conditions of each polarizer is orthogonal in its two sides
Obtained polarizer is opened, liquid crystal display device is made.Each polarizer with by aforementioned polyester film with liquid crystal opposite side (farther out
Position) mode configured.The light source of liquid crystal display device use White LED as light source (day sub- chemistry,
NSPW500CS), the White LED is combined by blue LED with yttrium-aluminium-garnet class yellow fluorophor
Light-emitting component is constituted.From the front of this liquid crystal display device and oblique progress visually, for whether there is or not the generation of rainbow spot,
Determined as follows.
A：It is generated from either direction without rainbow spot.
A'：When from oblique, extremely light rainbow spot is observed according to angle.
B：When from oblique, light rainbow spot is observed according to angle.
C：When from oblique, rainbow spot can be observed.
D：From positive direction and it is oblique from when, rainbow spot can be observed.
(6) tearing strength
Manufactured Elmendorf tear tester (Elmendorf tearing is made using Toyo Seiki
Tester), according to JIS P-8116, the tearing strength of each film is measured.Direction is torn with flat with the orientation major axes orientation of film
Capable mode carries out, and is determined as follows.It should be noted that the measurement molecularly oriented meter (Oji of orientation major axes orientation
Scientific Instruments manufacture, MOA-6004 type molecularly oriented meter) it measures.
○：Tearing strength is 50mN or more
×：Tearing strength is lower than 50mN
(Production Example 1- polyester A)
Heat up reaction kettle of the esterification, when reaching 200 DEG C, puts into 86.4 mass parts of terephthalic acid (TPA) and 64.6 matter of ethylene glycol
Part is measured, while stirring antimony trioxide 0.017 mass parts, magnesium acetate tetrahydrate 0.064 mass parts, three of the investment as catalyst
0.16 mass parts of ethamine.Then, pressurization heating is carried out, carries out pressurization esterification under conditions of gauge pressure 0.34Mpa, 240 DEG C
Afterwards, reaction kettle of the esterification is restored to normal pressure, adds 0.014 mass parts of phosphoric acid.In turn, 260 DEG C were warming up to 15 minutes, add phosphorus
Sour 0.012 mass parts of trimethyl.Then, over the course of 15 mins, decentralized processing is carried out with high pressure dispersing machine, after 15 minutes, will obtained
Esterification reaction product be transferred to batch condensation polymerization reactor, 280 DEG C, decompression under carry out polycondensation reaction.
After polycondensation reaction, place is filtered with this synthetic fibre (naslon) filter processed of receiving that 95% retention diameter is 5 μm
Reason, is extruded into threadiness from nozzle, has carried out filtration treatment (aperture using preparatory：1 μm or less) cooling water carry out it is cooling, solid
Change, is cut into partical.The inherent viscosity of obtained pet resin (A) is 0.62dl/g, is substantially free of
Non-active particles and internal precipitation particle (hereinafter referred to as PET (A)).
(Production Example 2- polyester B)
By the dried ultraviolet absorbing agent of the 10 mass parts (bis- (4H-3,1- benzoxazine -4- of 2,2 '-(1,4- phenylenes)
Ketone), 90 mass parts without particle PET (A) (inherent viscosity 0.62dl/g) mix, using mixing extruder, contained
The pet resin (B) (hereinafter referred to as PET (B)) of ultraviolet absorbing agent.
(preparation of the modified coating fluid of Production Example 3- cementability)
Carry out ester exchange reaction and polycondensation reaction using usual way, prepare as dicarboxylic acid component (relative to
Dicarboxylic acid component is whole) it is 46 moles of % of terephthalic acid (TPA), 46 moles of % of M-phthalic acid and 5-sodium sulfo isophthalate
8 moles of %, as glycol component (relative to glycol component entirety) be 50 moles of % of ethylene glycol and neopentyl glycol 50
The copolymer polyester resin of water dispersible alkali containing Sulfonic acid metal of the composition of mole %.Then, by 51.4 mass parts of water, isopropanol
After 38 mass parts, 5 mass parts of normal-butyl cellosolve, the mixing of 0.06 mass parts of nonionic class surfactant, heating stirring reaches
5 mass parts of copolymer polyester resin that above-mentioned water dispersible alkali containing Sulfonic acid metal is added after 77 DEG C continue stirring until not setting
After the agglomeration of rouge, aqueous resin dispersion liquid is cooled to room temperature, obtains the uniform water dispersible of 5.0 mass % of solid component concentration
Copolymer polyester resin liquid.In turn, by condensate silica dioxide granule (Fuji Silysia chemical Ltd. manufacture,
Sylysia 310) after 3 mass parts are distributed in 50 mass parts water, in the above-mentioned water dispersible copolymer polyester resin of 99.46 mass parts
0.54 mass parts of aqueous dispersions of Sylysia 310 are added in liquid, 20 mass parts of water are added while stirring, to obtain cementability
Modified coating fluid.
(polaroid protective film 1)
By as base film middle layer raw material without particle PET (A) resin granular material 90 mass parts with contain purple
After 10 mass parts of PET (B) resin granular material of ultraviolet absorbers are dried under reduced pressure (1Torr) 6 hours at 135 DEG C, supply to extrusion
Machine 2 (II layers of middle layer use), and using usual way dry PET (A) and it is respectively fed to (I layer of the outer layer and outside of extruder 1
Layer III use), it is dissolved at 285 DEG C.This 2 kinds of polymer are used (10 μm of nominal filter fineness of filter material of stainless steel sintered body respectively
Particle 95% retains) filtering, it is laminated in 2 kind of 3 laminated stream block, after squeezing out slabbing by tube head, is applied using electrostatic and cast
Method cools and solidifies on 30 DEG C of surface temperature of casting drum, makes non-stretched film.At this point, adjusting the discharge of each extruder
Amount so that I layer, II layers, the ratio between III layers of thickness be 10:80:10.
Then, the modified coating fluid of above-mentioned cementability is coated on the two sides of the non-stretched PET film by reverse roll method, so that
Coating weight after drying becomes 0.08g/m2, then 20 seconds dry at 80 DEG C.
The non-stretched film for being formed with the coating layer is guided to tentering stretching-machine, clamps the end of film with fixture on one side
Portion guides on one side to 125 DEG C of temperature of hot wind area, stretches 4.0 times in the width direction.Then, it is keeping stretching in the width direction
Width in the state of, handled with 225 DEG C, 30 seconds of temperature, further in the width direction carry out 3% relaxation processes,
Obtain about 50 μm of film thickness of uniaxial orientation PET film.
(polaroid protective film 2)
By changing the thickness of non-stretched film, making thickness is about 100 μm, in addition to this same as polaroid protective film 1
Obtain uniaxial orientation PET film.
(polaroid protective film 3)
It is not drawn using heated roller group and infrared heater by what is made by method same as polaroid protective film 1
Stretch film heating to 105 DEG C, then with after there is the roller group of difference to stretch 1.5 times along direction of travel, according to polarization
The same method of piece protective film 1 stretches 4.0 times in the width direction, obtains the Biaxially oriented PET film that film thickness is about 50 μm.
(polaroid protective film 4)
According to method same as polaroid protective film 3,2.0 times are stretched along direction of travel, stretches 4.0 in the width direction
Times, obtain the Biaxially oriented PET film that film thickness is about 50 μm.
(polaroid protective film 5)
According to method same as polaroid protective film 1, the PET resin containing ultraviolet absorbing agent is not used in middle layer
(B), the uniaxial orientation PET film that film thickness is 50 μm is obtained.
(polaroid protective film 6)
According to method same as polaroid protective film 3,4.0 times are stretched along direction of travel, stretches 1.0 in the width direction
Times, obtain the uniaxial orientation PET film that film thickness is about 100 μm.
(polaroid protective film 7)
According to method same as polaroid protective film 1,1.0 times are stretched along direction of travel, stretches 3.5 in the width direction
Times, obtain the uniaxial orientation PET film that film thickness is about 75 μm.
(polaroid protective film 8)
Using method same as polaroid protective film 1, changes the thickness of non-stretched film, cross directional stretch multiplying power is set as
3.8 times, draft temperature is set as to 135 DEG C, obtain the uniaxial orientation PET film that thickness is about 100 μm.
(polaroid protective film 9)
Using method same as polaroid protective film 1, cross directional stretch multiplying power is set as 3.8 times, is set as draft temperature
135 DEG C, obtain the uniaxial orientation PET film that thickness is about 50 μm.
(polaroid protective film 10)
Using method same as polaroid protective film 1, cross directional stretch multiplying power is set as 3.8 times, is obtained with a thickness of 50 μm
Uniaxial orientation PET film.
(polaroid protective film 11)
Using method same as polaroid protective film 1, cross directional stretch multiplying power is set as 4.2 times, is set as draft temperature
135 DEG C, obtain the uniaxial orientation PET film that thickness is about 50 μm.
(polaroid protective film 12)
Using method same as polaroid protective film 1, by changing the thickness of non-stretched film, by cross directional stretch multiplying power
Become 3.8 times, obtains the uniaxial orientation PET film with a thickness of 38 μm.
(polaroid protective film 13)
It is obtained using method same as polaroid protective film 1 by changing the thickness of non-stretched film with a thickness of 38 μm
Uniaxial orientation PET film.
(polaroid protective film 14)
According to method same as polaroid protective film 3,1.8 times are stretched along direction of travel, stretches 2.0 in the width direction
Times, obtain the Biaxially oriented PET film that film thickness is about 275 μm.
(polaroid protective film 15)
According to method same as polaroid protective film 3,3.6 times are stretched along direction of travel, stretches 4.0 in the width direction
Times, obtain the Biaxially oriented PET film that film thickness is about 38 μm.
(polaroid protective film 16)
Using method same as polaroid protective film 1, by changing the thickness of non-stretched film, obtaining thickness is about 10
μm uniaxial orientation PET film.
For use polaroid protective film 1~17 to make as described above liquid crystal display device measurement rainbow spot observation and
Tearing strength, the measurement results are shown for tables 1 below.
[table 1]
In table 1, polaroid protective film No.7* expression uses polaroid protective film 7 as polaroid protective film, uses
Organic Light Emitting Diode (OLED) is used as the case where light source.In addition, polaroid protective film No.7** indicates to use in table 1
Polaroid protective film 7 as polaroid protective film, use the case where cold-cathode tube is as light source.In table 1, polaroid protective film
No.1* indicate use polaroid protective film 1 as the emergent light side of emergent light lateral deviation tabula rasa polaroid protective film, use TAC
Film is as the polaroid protective film of the incident light side of emergent light lateral deviation tabula rasa and the polarization of the two sides of incident light lateral deviation tabula rasa
The case where piece protective film.
As a result, the retardation of display orientation polyester film is 4000 or more according to shown in table 1, and its Nz coefficient is 1.7
In situation below, rainbow spot can significantly be inhibited to generate.In addition, show on the basis of the condition, by by oriented polyester
The planar orientation degree of film is controlled 0.13 hereinafter, rainbow spot can more effectively be inhibited to generate.
Industrial availability
By using liquid crystal display device of the invention, polarizer and polaroid protective film, will not be led because of rainbow shape color spot
Cause the visual slimming for reducing, can contribute to LCD, cost effective.Therefore, industrial availability pole of the invention
It is high.
Claims (20)
1. a kind of liquid crystal display device with back light, 2 polarizers and is configured between 2 polarizers
Liquid crystal cells,
The polarizer is the composition that polaroid protective film is laminated on polarizing film,
The polaroid protective film for being configured at the incident light side of the polarizer of incident light side and the polarizer for being configured at emergent light side
Emergent light side polaroid protective film be retardation and 1.7 Nz coefficients below with 4000~30000nm orientation
Polyester film.
2. liquid crystal display device according to claim 1, wherein the planar orientation degree of oriented polyester films is 0.13 or less.
3. liquid crystal display device according to claim 1 or 2, wherein polarizer has polarizing film in the two sides of polarizing film
Protective film.
4. a kind of polarizer is formed by being laminated with constituting for polaroid protective film on polarizing film,
At least unilateral polaroid protective film is taking for retardation with 4000~30000nm and 1.7 Nz coefficients below
To polyester film.
5. polarizer according to claim 4, wherein the planar orientation degree of the oriented polyester films is 0.13 or less.
6. polarizer according to claim 4 or 5, wherein the oriented polyester films prolong with 8000~30000nm's
Chi Liang, 1.4 or more and 1.7 Nz coefficients below and 0.13 planar orientation degree below.
7. polarizer according to claim 4 or 5, wherein polarizer is to be laminated with polarizing film in the two sides of polarizing film to protect
The composition of cuticula.
8. polarizer according to claim 4 or 5, wherein polarizer is used for the white light with continuous luminous spectrum
Source is the liquid crystal display device of back light.
9. a kind of 2 polarizers of liquid crystal display device, the liquid crystal display device have back light, 2 polarizers, with
And the liquid crystal cells between 2 polarizers are configured at,
The polaroid protective film for being configured at the incident light side of the polarizer of incident light side and the polarizer for being configured at emergent light side
Emergent light side polaroid protective film be retardation and 1.7 Nz coefficients below with 4000~30000nm orientation
Polyester film.
10. 2 polarizers of liquid crystal display device according to claim 9, wherein the planar orientation of oriented polyester films
Degree is 0.13 or less.
11. 2 polarizers of liquid crystal display device according to claim 9 or 10, wherein the oriented polyester films
The Nz coefficient below of retardation, 1.4 or more and 1.7 and 0.13 planar orientation degree below with 8000~30000nm.
12. 2 polarizers of liquid crystal display device according to claim 9 or 10, wherein polarizer is in polarizing film
Two sides be laminated with the composition of polaroid protective film.
13. 2 polarizers of liquid crystal display device according to claim 9 or 10, wherein polarizer is used for have
The white light source of continuous luminous spectrum is the liquid crystal display device of back light.
14. a kind of polaroid protective film, it includes retardations and 1.7 Nz coefficients below with 4000~30000nm
Oriented polyester films.
15. polaroid protective film according to claim 14, wherein the planar orientation degree of the oriented polyester films is 0.13
Below.
16. polaroid protective film according to claim 14 or 15, wherein the oriented polyester films have 8000~
The retardation of 30000nm, 1.4 or more and 1.7 Nz coefficients below and 0.13 planar orientation degree below.
17. polaroid protective film according to claim 14 or 15, wherein the oriented polyester films have easily bonding
Layer.
18. polaroid protective film according to claim 14 or 15, wherein the oriented polyester films are at least by 3 layers of structure
At,
Contain ultraviolet absorbing agent in the layer other than outermost layer,
The light transmittance of 380nm is 20% or less.
19. polaroid protective film according to claim 14 or 15, for back light, 2 polarizers, Yi Jipei
It is placed in the polaroid protective film of the liquid crystal display device of the liquid crystal cells between 2 polarizers,
The oriented polyester films use as the polaroid protective film of the incident light side for the polarizer for being configured at incident light side, with
And the polaroid protective film of the emergent light side as the polarizer for being configured at emergent light side uses.
20. polaroid protective film according to claim 14 or 15, wherein polaroid protective film is used for have continuous hair
The white light source of light spectrum is the liquid crystal display device of back light.
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| JP2012168014 | 2012-07-30 | ||
| JP2012-168014 | 2012-07-30 | ||
| CN201380040840.4A CN104508545B (en) | 2012-07-30 | 2013-07-29 | Liquid crystal display device, polarizer and polaroid protective film |
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| CN201380040840.4A Division CN104508545B (en) | 2012-07-30 | 2013-07-29 | Liquid crystal display device, polarizer and polaroid protective film |
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| CN201810708067.9A Active CN108845451B (en) | 2012-07-30 | 2013-07-29 | Liquid crystal display device, polarizing plate and polarizer protective film |
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| JP (4) | JP6443048B2 (en) |
| KR (2) | KR102097392B1 (en) |
| CN (2) | CN104508545B (en) |
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| WO (1) | WO2014021242A1 (en) |
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|---|---|---|---|---|
| CN112162430A (en) * | 2020-09-04 | 2021-01-01 | 中国科学技术大学 | Liquid crystal display device for realizing non-linear polarized emergent light |
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| EP2711748A4 (en) | 2011-05-18 | 2014-12-03 | Toyo Boseki | Polarizing plate suitable for liquid crystal display device capable of displaying three-dimensional images, and liquid crystal display device |
| KR101719862B1 (en) | 2011-05-18 | 2017-03-24 | 도요보 가부시키가이샤 | Liquid crystal display device, polarizing plate, and polarizer protection film |
| CN105143967B (en) * | 2013-04-19 | 2019-02-19 | 东洋纺株式会社 | Liquid crystal display device, polarizer and polaroid protective film |
| JP6169530B2 (en) | 2014-05-13 | 2017-07-26 | 富士フイルム株式会社 | Liquid crystal display |
| JP6354410B2 (en) * | 2014-07-15 | 2018-07-11 | 東洋紡株式会社 | Polarizer protective film, polarizing plate, and liquid crystal display device using the same |
| WO2016084729A1 (en) * | 2014-11-25 | 2016-06-02 | 東洋紡株式会社 | Liquid crystal display device and polarizing plate |
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| KR20180023953A (en) * | 2015-07-16 | 2018-03-07 | 도요보 가부시키가이샤 | Liquid crystal display and polarizer |
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| CN114325916B (en) * | 2017-03-31 | 2023-10-13 | 东洋纺株式会社 | Liquid crystal display device, polarizing plate, and polarizing plate protective film |
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Also Published As
| Publication number | Publication date |
|---|---|
| KR102149433B1 (en) | 2020-10-14 |
| JP2019028472A (en) | 2019-02-21 |
| JP7070590B2 (en) | 2022-05-18 |
| WO2014021242A1 (en) | 2014-02-06 |
| KR20150041791A (en) | 2015-04-17 |
| JP7272474B2 (en) | 2023-05-12 |
| CN108845451B (en) | 2021-12-10 |
| JPWO2014021242A1 (en) | 2016-07-21 |
| KR20200035477A (en) | 2020-04-03 |
| TW201411202A (en) | 2014-03-16 |
| CN104508545B (en) | 2018-07-27 |
| JP2022050579A (en) | 2022-03-30 |
| JP2020098344A (en) | 2020-06-25 |
| CN104508545A (en) | 2015-04-08 |
| KR102097392B1 (en) | 2020-04-06 |
| JP6443048B2 (en) | 2018-12-26 |
| TWI530716B (en) | 2016-04-21 |
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