CN104508545B - 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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- CN104508545B CN104508545B CN201380040840.4A CN201380040840A CN104508545B CN 104508545 B CN104508545 B CN 104508545B CN 201380040840 A CN201380040840 A CN 201380040840A CN 104508545 B CN104508545 B CN 104508545B
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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
Offer can inhibit the liquid crystal display device that the rainbow spot in the polaroid protective film for using oriented polyester films as both 1 pair of polarizers generates.A kind of liquid crystal display device; it is with back light, 2 polarizers and the liquid crystal cells being configured between aforementioned 2 polarizers; backlight light source is the white light source with continuous luminous spectrum; aforementioned polarizer is in the both sides of polarizing film to be laminated with the composition of polaroid protective film, be configured at at least one of the polaroid protective film of the polarizer of incident light side and be configured at the polaroid protective film of the polarizer of emergent light side it is at least one be retardation and 1.7 Nz coefficients below with 4000~30000nm oriented polyester films.
Description
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 technology
The 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 replacement raw material are needed strongly.
Therefore, for the thin layer purpose of polarizer, it is proposed that replace TAC film using polyester film so that as
Polaroid protective film can keep 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 having defined optical anisotropy (retardation), when accordingly acting as polaroid protective film, if from oblique,
Rainbow shape color spot is will produce, image quality reduces.Therefore, it in Patent Documents 1 to 3, uses by using copolyester as poly-
Ester reduces the countermeasure of retardation.However, rainbow shape color spot can not be completely eliminated in this case.
Existing technical literature
Patent document
Patent document 1：Japanese Unexamined Patent Publication 2002-116320 bulletins
Patent document 2：Japanese Unexamined Patent Publication 2004-219620 bulletins
Patent document 3：Japanese Unexamined Patent Publication 2004-205773 bulletins
Patent document 4：WO2011-162198
Invention content
Problems to be solved by the invention
As the means to solve the above problems, the inventors of the present invention are found that using 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
Person of good sense 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 from oblique, according to angle, there are still generate rainbow spot.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 the above problem research day and night, 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 coefficients, 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 both sides of polarizing film,
It is configured at 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
According to the liquid crystal display device described in 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 the 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
According to the liquid crystal display device described in 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,
It is formed by being laminated with constituting for polaroid protective film in the both sides of polarizing film,
At least unilateral polaroid protective film is retardation and 1.7 Nz coefficients below with 4000~30000nm
Oriented polyester films.
6th
According to the 5th using the white light source with continuous luminous spectrum as the liquid crystal display device of back light
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
According to the 7th using the white light source with continuous luminous spectrum as the liquid crystal display device of back light
With polaroid protective film, which is characterized in that the planar orientation degree of aforementioned oriented polyester films is 0.13 or less.
9th
According to the 7th or the 8th using the white light source with continuous luminous spectrum as the liquid crystal of back light
Display device polaroid protective film, wherein aforementioned oriented polyester films have adhesive layer.
10th
According to the 7th~any one of the 9th using the white light source with continuous luminous spectrum as backlight
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 ultra-violet absorber in layer in addition, the light transmittance of 380nm is 20% or less.
The effect of invention
The liquid crystal display device of the present 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 reduction manufacturing cost.In turn, polarizer of the invention and polarizing film protection
Film makes the liquid crystal display device of the present invention be manufactured as possibility.
Specific implementation mode
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) it is made of successively 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
The liquid crystal display device of the present invention includes at least back light, two polarizers and is configured at two polarizers
Between liquid crystal cells as member of formation.The liquid crystal display device of the present 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, can also be
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 for being zero there is no the intensity of light in the region of light.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 element, the organic light-emitting diodes that white is sent out by fluorophor mode
Manage (Organic light-emitting diode；OLED) etc., the fluorophor mode will use the hair of compound semiconductor
The light emitting diode for going out blue light or ultraviolet light is combined with fluorophor.As fluorophor, for example, yttroalumite pomegranate
The yellow fluorophor of stone class, the yellow fluorophor etc. of terbium aluminium garnet class.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 suitable for as the present invention
Back light.Since the power consumption of White LED is smaller, also contributed to using the liquid crystal display device of its present 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 the present invention
Liquid crystal display device light source.
3. polaroid protective film
Polarizer has the composition that the both sides for the polarizing film that iodine is infected on PVA etc. are laminated with two polaroid protective films.
For polarizer used in the present invention, at least use in two polaroid protective films meets the retardation of particular range
And | ny-nz |/| ny-nx | shown in physical property as Nz coefficients oriented polyester films.
3-1. retardation
The oriented polyester films used in polaroid protective film used in the present invention preferably have 4000~30000nm's
Retardation.This is because when retardation is less than 4000nm, interference colours are presented when liquid crystal display device from oblique, usually can not
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 can also use KOBRA-21ADH (Oji Scientific Instruments)
Double refraction detection device measures.
As shown in patent document 4, using oriented polyester films only as any polaroid protective film of 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.
If that is, in oriented polyester films of the one-sided configuration with birefringence of polarizing film, projected from polarizing film 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, discontinuous if using cold-cathode tube, thermionic-cathode tube etc. to have as light source
The light source of luminescent 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
Through the envelope shape formation similar shape for the interference color spectrum that the transmitted light of birefringence body generates, to not generate rainbow shape
Color spot, visuality significantly improve.
If however, as described above, use 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 that inhibition that rainbow spot as above generates, principle are not yet fully explained
It is bright.
3-2.Nz coefficient
For the oriented polyester films used in polaroid protective film, | ny-nz |/| ny-nx | shown in Nz coefficients it is preferred
It is 1.7 or less.Nz coefficients can be found out as follows.Use molecularly oriented meter (Oji Scientific Instruments systems
Make, MOA-6004 types molecularly oriented meter) the orientation axis direction of film is found out, utilize Abbe refractometer (ATAGO CO., LTD.
Manufacture, measures wavelength 589nm at NAR-4T) come find out the twin shaft for being orientated axis direction and orthogonal to that direction 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 coefficients.
It, may be due to angle from oblique when liquid crystal display device if the Nz coefficients of oriented polyester films are more than 1.7
Generate rainbow spot.Nz coefficients are more preferably 1.65 or less, further preferably 1.63 or less.The lower limiting value of Nz coefficients is 1.2.This is
Because obtaining film of the Nz coefficients less than 1.2 to be difficult in manufacturing technology.In addition, in order to keep the mechanical strength of film,
The lower limiting value of Nz coefficients 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 films
In the liquid crystal display device of the present invention, the oriented polyester with above-mentioned specific retardation and Nz coefficients is thin
Film 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 inclined of incident light side
Tabula rasa with relative to liquid crystal configurations in the combination of the polarizer of emergent light side.That is, the oriented polyester films are for incident light side
The polarizer of polarizer and both polarizers of emergent light side.The oriented polyester films may be used as constituting two of each polarizer
At least one in polaroid 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 the polaroid protective film of the emergent light side of the polarizer as emergent light side.Merely comprise the two of polarizer
When opening use oriented polyester films of polaroid protective film, another can use 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
Shake piece protective film and be configured at emergent light side polarizer liquid crystal cell side polaroid protective film, then exist make liquid crystal list
The possibility of the 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 by the delay magnitude of oriented polyester films and the control of Nz coefficients in above-mentioned particular range, also pass through
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
Rainbow spot when using polyester film as polaroid protective film.Wherein, the value of nx, ny and nz utilize side identical with Nz coefficients
Method acquires.The planar orientation degree of oriented polyester films is preferably 0.13 or less, is more preferably 0.125 or less, further preferably
0.12 or less.By making planar orientation degree for 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 less than 0.08, have
When film thickness change, the value of retardation becomes uneven in pellicular front.
3-5. retardation ratios
The retardation (Re) of oriented polyester films and the ratio (Re/Rth) of thickness direction retardation amount (Rth) be preferably 0.2 with
Above, 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 generate the rainbow shape color caused by 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.In order to completely inhibit the generation of the rainbow shape color spot caused by viewing angle, above-mentioned retardation and thickness direction phase
The ratio (Re/Rth) of difference need not be 2, below 1.2 enough.In addition, even if above-mentioned ratio 1.0 hereinafter, it is abundant
Meet the field angle characteristic (left and right 180 degree, upper and lower 120 degree or so) required by liquid crystal display device.
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 the effect of the present invention, usually 15~
300 μm, preferably 15~200 μm.When film thickness is less than 15 μm, the anisotropy of the mechanical characteristic of film becomes notable, 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
Be not particularly limited, can use so that dicarboxylic acids and glycol is condensed obtained from arbitrary polyester resin.
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 acids, 1,3- hexamethylene dicarboxyls
Acid, 1,4- cyclohexane dicarboxylic acids, 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 acids, 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- cyclohexanedimethanols, 1,4 cyclohexane dimethanol, decamethylene glycol, 1,3- propylene glycol,
Bis- (4- hydroxy phenyls) propane of 1,4- butanediols, 1,5- pentanediols, 1,6-HD, 2,2-, bis- (4- hydroxy phenyls) sulfones etc..
For constituting dicarboxylic acid component and the diol component of polyester resin, can use arbitrary 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 since intrinsic birefringence is big the thickness of film is thin,
Therefore it 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 work(
Energy property pigment goes bad because of caused by ultraviolet light.Light transmittance is the value measured with vertical process relative to the plane of film, can be with
It is measured using spectrophotometer (for example, Hitachi's U-3500 types).
By the thickness of the type of the ultra-violet absorber suitable for adjusting compounding, concentration and film, orientation can be made poly-
The light transmittance of the wavelength 380nm of ester film controls below 20%.For ultra-violet absorber used in the present invention, Ke Yishi
Well known ultra-violet absorber is preferably selected to use.As specific ultra-violet absorber, the suction of organic ultraviolet light can be enumerated
Agent and inorganic UV absorber are received, from the viewpoint of the transparency, preferred organic ultra-violet absorber.
As organic ultra-violet absorber, can enumerate：Benzotriazole, benzophenone and cyclic imide base ester
Class etc. and combination thereof, 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-butyls -6- (5- chlorobenzotriazole -2- bases) phenol, 2- (2 '-hydroxyls -3 '-tertiary butyl -5 '-methylbenzene
Base) -5- chlorobenzotriazoles, 2- (5- chlorine (2H)-benzotriazole -2- bases) -4- methyl -6- (tertiary butyl) phenol, 2,2 '-methylene
Bis- (4- (1,1,3,3- tetramethyl butyls) -6- (2H- benzotriazole -2- bases) 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- benzos
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 ultra-violet absorber in oriented polyester films, oriented polyester films are made to 3 layers or more of multilayer knot
Structure, the middle addition ultra-violet absorber of layer (that is, middle layer) other than the outermost layer of film is preferred.
3-10. other compositions etc.
Other than ultra-violet absorber, containing each in the range for the effect for not interfering the present 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 of inorganic particle, it is when being quantified to inorganic elements using x-ray fluorescence analysis
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,
The ingredient that it is 50 mass % or more that " main component ", which refers in the solid constituent for constitute adhesive layer,.It is used to form the easy of the present invention
The coating fluid of adhesive linkage preferably comprises water-soluble or water dispersible copolymer polyester resin, acrylic resin and polyurethane tree
At least one kind of aqueous coating fluid in fat.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-soluble or water dispersible copolymer polyester resin solution, acrylic resin disclosed in No. 4150982 bulletin of this patent etc.
Solution and polyurethane resin solution etc..
Adhesive layer can by by above-mentioned coating solution in non-stretched film or the single side of longitudinal single axle drawn membrane
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 less than 0.05g/m2, then the cementability sometimes with obtained polarizing film can not
Fully.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 linkage, 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 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 coated using well known method.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, with the multiplying power that the size of minimum particle 1 is 2~5mm, 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 the cementability with polarizing film become good, can also oriented polyester films 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
Face is arranged various functions layers, is selected from by hard conating, antiglare layer, anti-reflection layer, low reflection layer, anti-low reflection layer and counnter attack
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 linkage 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
The adjustment for connecing the refractive index of layer may be used well known method, for example, 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
The oriented polyester films of protective film as the present invention can be manufactured according to the manufacturing method of normal polyester film.
For example, following method：Polyester resin is melted, makes the No yield point polyester that extrusion molding is sheet in glass transition
It at temperature more than temperature, after being longitudinally stretched using the speed difference of roller, is transversely stretched through stenter, implements heat treatment.
The oriented polyester films of the present invention can be single axle drawn membrane, can also be biaxially oriented film, 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 in direction of travel, width direction, thickness direction by having difference
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, will produce sometimes
As a result the point that retardation is zero generates rainbow shape color spot centered on the point in concentric circles.Then, by from pellicular front just on
Side's (normal direction) is to when can see that the angle of the position of rainbow shape color spot is denoted as θ, bigger angle, θ of birefringence 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 visual field scope has biaxiality (twin shaft symmetry) in the range of rainbow shape color spot.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 coefficients, 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 which retardation control in above-mentioned specific range, preferably to be controlled to 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 relatively low 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 coefficients 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 coefficients, 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 coefficients 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, can more obtain 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 systems
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.
Ultra-violet absorber can combine well known method to implement to the compounding of oriented polyester films.For example, can lead to
Following methods etc. are crossed to be compounded：Mixing extruder is used in advance, and dried ultra-violet absorber is mixed with polymer raw material
Masterbatch is made, is mixed the defined masterbatch with polymer raw material in forming thin film.
For the ultraviolet radiation absorption agent concentration of above-mentioned masterbatch, in order to keep ultra-violet absorber 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, ultra-violet absorber it is uniform
Mixing becomes difficult.At this point, stabilizer, hue adjustment agent, antistatic agent can also be added as needed on.
For being compounded ultra-violet absorber in the middle layer of the oriented polyester films of the multilayered structure more than having three layers in tool,
It can be implemented by gimmick below.As outer layer well known melting stacking extrusion is supplied separately to by the pellet of polyester
Machine, as middle layer with will the masterbatch containing ultra-violet absorber and polyester pellet mix, dry in defined ratio after, confession
Well known melting stacking extruder is awarded, slabbing is squeezed out 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
It cools down 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, the present invention is more specifically illustrated referring to embodiment, but the present invention is not limited by following embodiments
System can also be suitably changed in the range of meeting the purport of the present invention to implement, these embodiments are all contained in this
In the protection domain of invention.
Physical property in embodiment evaluation method is as follows.
(1) retardation (Re)
Retardation refer to the anisotropy of the refractive index of the orthogonal twin shaft on film (△ Nxy=| nx-ny |) 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 manufactures, MOA-6004 types molecularly oriented meter) the orientation axis direction that finds out film, 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. manufactures, NAR-4T, measure wavelength 589nm) measure orthogonal twin shaft 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 manufactures, 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 coefficients
Will be by | ny-nz |/| ny-nx | obtained value is used as Nz coefficients.Wherein, with ny>The mode of nx select ny and
The value of nx.
(3) planar orientation degree (△ P)
To planar orientation degree (△ P) be used as by the obtained values of (nx+ny)/2-nz.
(4) thickness direction retardation amount (Rth)
When thickness direction retardation amount refers to by from film thickness directional profile 2 birefringence △ Nxz (=| nx-
Nz |), △ Nyz (=| ny-nz |) it is multiplied by the parameter of the average value of display delay amount obtained from film thickness d respectively.Using with
The same method of 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.Liquid crystal is clipped respectively to configure under conditions of each polarizer is orthogonal in its both sides
One obtained polarizer makes liquid crystal display device.Each polarizer with by aforementioned polyester film with liquid crystal opposite side (compared with
Distant positions) 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,
Judged 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 are 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 judged as follows.It should be noted that being orientated the measurement molecularly oriented meter (Oji of major axes orientation
Scientific Instruments manufacture, MOA-6004 types molecularly oriented meter) it measures.
○：Tearing strength is 50mN or more
×：Tearing strength is less 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, input is as 0.017 mass parts of antimony trioxide of catalyst, 0.064 mass parts of magnesium acetate tetrahydrate, three while stirring
0.16 mass parts of ethamine.Then, pressurization heating is carried out, pressurization esterification is carried out 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
0.012 mass parts of sour 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 95% a diameter of 5 μm this synthetic fibre (naslon) filter processed of receiving of retention
Reason, threadiness is extruded into from nozzle, using having carried out filtration treatment (aperture in advance：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 ultra-violet absorber of the 10 mass parts (bis- (4H-3,1- benzoxazines -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 ultra-violet absorber.
(Production Example 3- cementabilities are modified the preparation of coating fluid)
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 caking of fat, 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 PET (A) resin granular material 90 mass parts of the base film middle layer raw material without particle 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 (middle layer II layers use), and using usual way drying 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 to filter material (10 μm of the nominal filter fineness 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 the casting drum of 30 DEG C of surface temperature, 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, above-mentioned cementability is coated on the two sides of the non-stretched PET film by reverse roll method and is modified coating fluid 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 the hot wind area of 125 DEG C of temperature, stretches 4.0 times in the width direction.Then, it is keeping stretching in the width direction
Width in the state of, handled for 225 DEG C, 30 seconds with temperature, further in the width direction carry out 3% relaxation processes,
Obtain the uniaxial orientation PET film of about 50 μm of film thickness.
(polaroid protective film 2)
By changing the thickness of non-stretched film, it is about 100 μm to make thickness, in addition to this same as polaroid protective film 1
Obtain uniaxial orientation PET film.
(polaroid protective film 3)
It is not drawn what is made by method same as polaroid protective film 1 using heated roller group and infrared heater
Stretch film heating to 105 DEG C, then with the roller group with difference after direction of travel stretches 1.5 times, according to polarization
1 same method of piece protective film 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, stretches 2.0 times 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 ultra-violet absorber 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, stretches 4.0 times 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, stretches 1.0 times 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, it is 50 μm to obtain thickness
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 that thickness is 38 μm.
(polaroid protective film 13)
Using method same as polaroid protective film 1, by changing the thickness of non-stretched film, it is 38 μm to obtain thickness
Uniaxial orientation PET film.
(polaroid protective film 14)
According to method same as polaroid protective film 3, stretches 1.8 times 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, stretches 3.6 times 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, it is about 10 to obtain thickness
μm uniaxial orientation PET film.
For use the liquid crystal display device that polaroid protective film 1~17 makes as described above measure the observation of rainbow spot and
Its measurement result is shown in table 1 below by tearing strength.
[table 1]
In table 1, polaroid protective film No.7* expressions use polaroid protective film 7 as polaroid protective film, use
Organic Light Emitting Diode (OLED) is used as the case where light source.In addition, in table 1, polaroid protective film No.7** indicates to use
Polaroid protective film 7 as polaroid protective film, using cold-cathode tube as light source the case where.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 both sides of incident light lateral deviation tabula rasa
The case where piece protective film.
According to shown in table 1 as a result, the retardation of display orientation polyester film be 4000 or more, and its Nz coefficient be 1.7
In the case of 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, polarizer and the polaroid protective film of the present invention, will not be led because of rainbow shape color spot
It causes visual reduction, can contribute to being thinned, being cost effective for LCD.Therefore, industrial availability pole of the invention
It is high.
Claims (4)
1. a kind of liquid crystal display device with back light, 2 polarizers and is configured between 2 polarizers
Liquid crystal cells,
The back light is the white light source with continuous luminous spectrum, and the polarizer is to be laminated in the both sides of polarizing film
The composition of polaroid protective film,
It is configured at at least one of the polaroid protective film of the polarizer of incident light side and is configured at the polarizer of emergent light side
Polaroid protective film at least one orientation for retardation and 1.7 Nz coefficients below with 4000~30000nm
Polyester film,
Wherein, Nz coefficients are with | ny-nz |/| ny-nx | it indicates, ny and nx are the folding for being orientated axis direction and orthogonal to that direction
Rate is penetrated, and meets ny>The relationship of nx, nz are the refractive index of thickness direction.
2. liquid crystal display device according to claim 1, wherein the incident light of the polarizer for being configured at incident light side
The polaroid protective film of the emergent light side of the polaroid protective film of side and the polarizer for being configured at emergent light side be with
The oriented polyester films of the retardation of 4000~30000nm and 1.7 Nz coefficients below.
3. liquid crystal display device according to claim 1 or 2, wherein the planar orientation degree of oriented polyester films be 0.13 with
Under, here, planar orientation degree is indicated with (nx+ny)/2-nz.
4. liquid crystal display device according to claim 1 or 2, wherein the white light source with continuous luminous spectrum
For white light-emitting diode.
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| CN201810708067.9A CN108845451B (en) | 2012-07-30 | 2013-07-29 | Liquid crystal display device, polarizing plate and polarizer protective film |
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| JP2012-168014 | 2012-07-30 | ||
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| CN201380040840.4A Active CN104508545B (en) | 2012-07-30 | 2013-07-29 | Liquid crystal display device, polarizer and polaroid protective film |
| 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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| 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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| US10175494B2 (en) | 2011-05-18 | 2019-01-08 | Toyobo Co., Ltd. | Polarizing plate suitable for liquid crystal display device capable of displaying three-dimensional images, and liquid crystal display device |
| EP2711765B1 (en) | 2011-05-18 | 2018-07-04 | Toyobo Co., Ltd. | Liquid crystal display device, use of polarizer, use of protective film |
| WO2014171386A1 (en) * | 2013-04-19 | 2014-10-23 | 東洋紡株式会社 | Liquid-crystal display, polarizing plate, and polarizer-protecting 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 |
| CN107003562B (en) * | 2014-11-25 | 2021-07-23 | 东洋纺株式会社 | Liquid crystal display device and polarizing plate |
| KR101813438B1 (en) * | 2015-03-04 | 2018-01-30 | 도요보 가부시키가이샤 | Liquid crystal display device |
| KR20180023953A (en) * | 2015-07-16 | 2018-03-07 | 도요보 가부시키가이샤 | Liquid crystal display and polarizer |
| CN108139628A (en) * | 2015-10-16 | 2018-06-08 | 东洋纺株式会社 | Liquid crystal display device and polarizer |
| WO2018181655A1 (en) * | 2017-03-31 | 2018-10-04 | 東洋紡株式会社 | Liquid crystal display device, polarizing plate, and polarizer protective film |
| CN112805603B (en) | 2018-10-02 | 2023-10-20 | 东洋纺株式会社 | Liquid crystal display device, polarizing plate, and polarizing plate protective film |
| KR102434542B1 (en) * | 2018-10-15 | 2022-08-19 | 삼성에스디아이 주식회사 | Polarizing plate for ips liquid crystal display apparatus and ips liquid crystal display apparatus comprising the same |
| 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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Also Published As
| Publication number | Publication date |
|---|---|
| TW201411202A (en) | 2014-03-16 |
| KR102097392B1 (en) | 2020-04-06 |
| JP2022050579A (en) | 2022-03-30 |
| WO2014021242A1 (en) | 2014-02-06 |
| KR102149433B1 (en) | 2020-10-14 |
| JP7070590B2 (en) | 2022-05-18 |
| JP2019028472A (en) | 2019-02-21 |
| KR20200035477A (en) | 2020-04-03 |
| CN108845451A (en) | 2018-11-20 |
| JPWO2014021242A1 (en) | 2016-07-21 |
| CN104508545A (en) | 2015-04-08 |
| JP6443048B2 (en) | 2018-12-26 |
| KR20150041791A (en) | 2015-04-17 |
| JP2020098344A (en) | 2020-06-25 |
| JP7272474B2 (en) | 2023-05-12 |
| TWI530716B (en) | 2016-04-21 |
| CN108845451B (en) | 2021-12-10 |
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