WO2013080948A1 - Dispositif d'affichage à cristaux liquides, plaque polarisante et film protecteur de polariseur - Google Patents

Dispositif d'affichage à cristaux liquides, plaque polarisante et film protecteur de polariseur Download PDF

Info

Publication number
WO2013080948A1
WO2013080948A1 PCT/JP2012/080561 JP2012080561W WO2013080948A1 WO 2013080948 A1 WO2013080948 A1 WO 2013080948A1 JP 2012080561 W JP2012080561 W JP 2012080561W WO 2013080948 A1 WO2013080948 A1 WO 2013080948A1
Authority
WO
WIPO (PCT)
Prior art keywords
film
liquid crystal
retardation
crystal display
protective film
Prior art date
Application number
PCT/JP2012/080561
Other languages
English (en)
Japanese (ja)
Inventor
村田　浩一
佐々木　靖
Original Assignee
東洋紡株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 東洋紡株式会社 filed Critical 東洋紡株式会社
Priority to KR1020147016781A priority Critical patent/KR101947854B1/ko
Priority to JP2013547151A priority patent/JP5614506B2/ja
Priority to CN201280058791.2A priority patent/CN103959149B/zh
Publication of WO2013080948A1 publication Critical patent/WO2013080948A1/fr

Links

Classifications

    • 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
    • G02B5/3083—Birefringent or phase retarding elements
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133528—Polarisers
    • G02F1/133531—Polarisers characterised by the arrangement of polariser or analyser axes

Definitions

  • the present invention relates to a liquid crystal display device. Specifically, the present invention relates to a liquid crystal display device in which generation of rainbow spots is improved.
  • a polarizing plate used in a liquid crystal display device is usually configured by sandwiching a polarizer obtained by dyeing iodine in polyvinyl alcohol (PVA) or the like between two polarizer protective films.
  • PVA polyvinyl alcohol
  • TAC triacetyl cellulose
  • TAC films are very expensive, and there is a strong demand for inexpensive alternative materials.
  • Patent Documents 1 to 3 it has been proposed to use a polyester film instead of the TAC film so that the polarizing plate can be made thin so that high durability can be maintained even if the thickness is small as a polarizer protective film.
  • the polyester film is superior to the TAC film in durability, but unlike the TAC film, it has birefringence. Therefore, when it is used as a polarizer protective film, there is a problem that the image quality is deteriorated due to optical distortion. That is, since the polyester film having birefringence has a predetermined optical anisotropy (retardation), when used as a polarizer protective film, a rainbow-like color spot is generated when observed from an oblique direction, and the image quality is deteriorated. . Therefore, Patent Documents 1 to 3 take measures to reduce retardation by using a copolyester as the polyester. However, even in that case, the iridescent color spots could not be completely eliminated.
  • the present inventors have found that a white light source having a continuous emission spectrum is used as a backlight light source, and an oriented polyester film having a certain retardation is used as a polarizer protective film. It was. However, the inventors have made further studies on the liquid crystal display device having such a configuration, and even in such an improved liquid crystal display device, polyester as a polarizer protective film is provided on both of the pair of polarizing plates. When the film was used, it was rediscovered that, when observed from an oblique direction, rainbow spots may occur depending on the angle, and the problem of rainbow spots has not been completely solved.
  • the pair of polarizing plates when a liquid crystal display device is industrially produced using a polarizing plate using a polyester film as a polarizer protective film, the pair of polarizing plates usually have directions of orientation main axes of the polyester film constituting them normally perpendicular to each other. It is arranged to become. This is due to the following circumstances.
  • a polyvinyl alcohol film that is a polarizer is manufactured by longitudinal uniaxial stretching
  • a polyester film that is a protective film is usually manufactured by lateral stretching after longitudinal stretching.
  • the orientation main axis direction is the horizontal direction.
  • the orientation axis of the polyester film and the polarization axis of the polarizer are usually in the vertical direction.
  • the present inventor has found that the orientation main axes of the oriented polyester film (polarizer protective film) constituting the pair of polarizing plates arranged on both sides of the liquid crystal are substantially parallel to each other. I found that no rainbow spots were observed, but when it was almost vertical, rainbow spots were produced depending on the angle at which the liquid crystal display was viewed.
  • the present invention has been completed as a result of further research and improvement based on such knowledge.
  • the representative present invention is as follows.
  • Item 1. A liquid crystal display device having a backlight light source, two polarizing plates, and a liquid crystal cell disposed between the two polarizing plates,
  • the backlight source is a white light source having a continuous emission spectrum;
  • Each of the two polarizing plates comprises a polarizer and protective films on both sides thereof, At least one of the protective films on both sides is an oriented polyester film having a retardation of 3000 to 30000 nm, The orientation main axes of the oriented polyester film constituting the two polarizing plates are substantially parallel to each other.
  • Liquid crystal display device Item 2.
  • Item 2. Item 2.
  • the liquid crystal display device according to item 1, wherein the ratio (Re / Rth) of retardation of the oriented polyester film to thickness direction retardation is 0.2 or more and 1.2 or less.
  • Item 3. Item 3. The liquid crystal display device according to any one of Items 1 and 2, wherein the white light source having the continuous emission spectrum is formed of a white light emitting diode.
  • Item 4. The polyester film consists of three or more layers, Contains a UV absorber in a layer other than the outermost layer, The light transmittance at 380 nm is 20% or less, Item 4.
  • the liquid crystal display device according to any one of Items 1 to 3.
  • the liquid crystal display device, polarizing plate, and polarizer protective film of the present invention can obtain a spectrum of transmitted light that approximates the light source at any observation angle, and significantly suppress the occurrence of rainbow-like color spots. It is possible to ensure good visibility. Moreover, in suitable one Embodiment, the polarizer protective film of this invention is equipped with the mechanical strength suitable for thickness reduction.
  • a liquid crystal display device has a rear module, a liquid crystal cell, and a front module in order from the backlight light source side to the image display side (viewing side).
  • the rear module and the front module are generally composed of a transparent substrate, a transparent conductive film formed on the liquid crystal cell side surface, and a polarizing plate disposed on the opposite side.
  • the polarizing plate is disposed on the backlight source side in the rear module, and is disposed on the image display side (viewing side) in the front module.
  • the liquid crystal display device of the present invention includes at least a backlight light source and a liquid crystal cell disposed between two polarizing plates as constituent members. Moreover, you may have suitably other structures other than these, for example, a color filter, a lens film, a diffusion sheet, an antireflection film etc. suitably.
  • the configuration of the backlight may be an edge light method using a light guide plate or a reflection plate as a constituent member, or may be a direct type, but in the present invention, it is a continuous light source for a liquid crystal display device. It is preferable to use a white light source having a broad emission spectrum.
  • the continuous and broad emission spectrum means an emission spectrum in which there is no wavelength at which the light intensity becomes zero in the wavelength region of at least 450 nm to 650 nm, preferably in the visible light region. Examples of such a white light source having a continuous and broad emission spectrum include a white light emitting diode (white LED).
  • White LEDs include phosphors, that is, elements that emit white light by combining a phosphor that emits blue light or ultraviolet light using a compound semiconductor, and organic light-emitting diodes (Organic light-emitting diodes: OLEDs). Etc. are included.
  • the phosphor include yttrium / aluminum / garnet yellow phosphor and terbium / aluminum / garnet yellow phosphor.
  • white light-emitting diodes which are composed of light-emitting elements that combine blue light-emitting diodes using compound semiconductors with yttrium, aluminum, and garnet-based yellow phosphors, have a continuous and broad emission spectrum and are also efficient in light emission. Since it is excellent, it is suitable as the backlight light source of the present invention. In addition, since the white LED with low power consumption can be widely used by the method of the present invention, it is possible to achieve an energy saving effect.
  • Fluorescent tubes such as cold cathode tubes and hot cathode tubes that have been widely used as backlight light sources in the past have only a discontinuous emission spectrum whose emission spectrum has a peak at a specific wavelength. Since it is difficult to obtain the effect of the period, it is not preferable.
  • the polarizing plate has a configuration in which both sides of a polarizer in which iodine is dyed on PVA or the like is sandwiched between two polarizer protective films, but the present invention is at least one of the polarizer protective films constituting the polarizing plate.
  • a polyester film having a specific range of retardation is used.
  • the mechanism for suppressing the occurrence of rainbow-like color spots according to the above aspect is considered as follows.
  • the linearly polarized light emitted from the polarizer is disturbed when passing through the polyester film.
  • the transmitted light shows an interference color peculiar to retardation which is a product of birefringence and thickness of the oriented polyester film. Therefore, if a discontinuous emission spectrum such as a cold cathode tube or a hot cathode tube is used as the light source, the transmitted light intensity varies depending on the wavelength, and a rainbow-like color spot is generated (see: 15th Micro Optical Conference Proceedings, No. 1). 30-31).
  • white light emitting diodes usually have a continuous and broad emission spectrum in a wavelength region of at least 450 nm to 650 nm, preferably in the visible light region. Therefore, when attention is paid to the envelope shape of the interference color spectrum by the transmitted light transmitted through the birefringent body, it is possible to obtain a spectrum similar to the emission spectrum of the light source by controlling the retardation of the oriented polyester film. Thus, the emission spectrum of the light source and the envelope shape of the interference color spectrum by the transmitted light that has passed through the birefringent body are similar to each other, so that rainbow-like color spots do not occur and the visibility is remarkable. It is thought to improve.
  • the oriented polyester film used for the polarizer protective film preferably has a retardation of 3000 to 30000 nm.
  • the preferred lower limit of retardation is 4500 nm
  • the next preferred lower limit is 5000 nm
  • the more preferred lower limit is 6000 nm
  • the still more preferred lower limit is 8000 nm
  • the still more preferred lower limit is 10,000 nm.
  • the upper limit of retardation is 30000 nm. Even if an oriented polyester film having a retardation higher than that is used, not only a further improvement in visibility can be obtained, but also the thickness of the film is considerably increased, and the handling property as an industrial material is reduced. It is not preferable.
  • the retardation of the present invention can be obtained by measuring the refractive index and thickness in the biaxial direction, or by using a commercially available automatic birefringence measuring device such as KOBRA-21ADH (Oji Scientific Instruments). it can.
  • retardation means in-plane retardation.
  • the polarizer protective film having the specific retardation is used for polarizing plates on both the incident light side (light source side) and the outgoing light side (viewing side).
  • the polarizer protective film having the above specific retardation may be disposed on the incident light side from the polarizer, or on the liquid crystal cell side, on both sides. However, it is preferably arranged at least on the incident light side.
  • the polarizer protective film having the specific retardation described above is disposed on both sides regardless of whether it is disposed on the liquid crystal side starting from the polarizer, or disposed on the outgoing light side. Although it may be arranged, it is preferably arranged at least on the outgoing light side. From the viewpoint of ensuring good polarization characteristics, the polarizer protective film on the incident light side of the polarizing plate arranged on the incident light side, and the polarizer protective film on the outgoing light side of the polarizing plate arranged on the outgoing light side It is preferable to use a polarizer protective film having a retardation in the specific range.
  • the polarizing plate of the present invention has a structure in which both sides of a known polarizer such as a film in which iodine is dyed on polyvinyl alcohol (PVA) or the like is sandwiched between two polarizer protective films, and at least any polarized light
  • the child protective film is a polarizing plate protective film having the specific retardation.
  • As the other polarizer protective film it is preferable to use a film having no birefringence such as a TAC film, an acrylic film, and a norbornene-based film.
  • the orientation main axes of both oriented polyester films are preferably substantially parallel to each other.
  • the orientation main axis of the polarizer protective film constituting a pair of polarizing plates (a polarizing plate on the light source side and a polarizing plate on the viewing side with respect to the liquid crystal) disposed between the liquid crystals is are substantially parallel to each other.
  • an angle formed between the orientation principal axis of one polarizer protective film and the orientation principal axis of the other polarizer protective film is that the two polarizing plates exist in the same plane.
  • substantially parallel is substantially parallel.
  • substantially parallel means that when the pair of polarizing plates are arranged so that their polarization axes are perpendicular to each other, the alignment main axes are parallel to such an extent that inevitably misalignment is allowed. Means.
  • the mechanism has not yet been elucidated, the occurrence of rainbow spots on the liquid crystal display screen can be suppressed by the fact that the orientation main axes of the oriented polyester films constituting the two polarizing plates are substantially parallel.
  • the direction of the orientation main axis can be determined by measuring with a molecular orientation meter (for example, MOA-6004 type molecular orientation meter manufactured by Oji Scientific Instruments).
  • the polarizing axis of the polarizer of each polarizing plate and the orientation main axis of the oriented polyester film are substantially parallel or substantially perpendicular from the viewpoint of further suppressing irises and improving visibility.
  • substantially parallel means that the angle formed by the polarization axis of the polarizer and the orientation main axis of the oriented polyester film is preferably ⁇ 15 ° to 15 °, more preferably ⁇ 10 ° to 10 °, and still more preferably ⁇ It means 5 ° to 5 °, more preferably -3 ° to 3 °, and still more preferably -1 ° to 1 °.
  • substantially perpendicular means that the angle formed by the polarization axis of the polarizer and the axis perpendicular to the orientation main axis of the oriented polyester film is preferably ⁇ 15 ° to 15 °, more preferably ⁇ 10 ° to 10 °. °, more preferably from -5 ° to 5 °, even more preferably from -3 ° to 3 °, and even more preferably from -1 ° to 1 °.
  • substantially parallel or substantially vertical means substantially parallel or substantially vertical.
  • substantially parallel means that when the polarizing axis of the polarizer and the orientation main axis of the oriented polyester film are arranged in parallel, they are parallel to each other to the extent that the inevitable deviation is allowed. means.
  • substantially perpendicular means that when the polarizing axis of the polarizer and the orientation main axis of the oriented polyester film are arranged perpendicular to each other, they are perpendicular to each other to the extent that an inevitable shift is allowed. means.
  • the polarizing plate used in the present invention may be provided with various functional layers, that is, a hard coat layer, an antiglare layer, an antireflection layer, and the like on the oriented polyester surface for the purpose of preventing reflection, suppressing glare, and suppressing scratches.
  • the oriented polyester film preferably has an easy adhesion layer on the surface thereof.
  • it is preferable to adjust the refractive index of the easy-adhesion layer so that it is close to the geometric mean of the refractive index of the functional layer and the refractive index of the oriented polyester film.
  • the refractive index of the easy-adhesion layer can be adjusted by a known method.
  • the refractive index of the easy-adhesion layer can be easily adjusted by containing a binder resin with titanium, germanium, or other metal species.
  • the oriented polyester used in the present invention may be polyethylene terephthalate or polyethylene naphthalate, but may contain other copolymerization components. These resins are excellent in transparency and excellent in thermal and mechanical properties, and the retardation can be easily controlled by stretching.
  • polyethylene terephthalate is the most suitable material because it has a large intrinsic birefringence and a large retardation can be obtained relatively easily even if the film is thin.
  • the protective film of the present invention desirably has a light transmittance of 20% or less at a wavelength of 380 nm.
  • the light transmittance at 380 nm is more preferably 15% or less, further preferably 10% or less, and particularly preferably 5% or less. If the light transmittance is 20% or less, the optical functional dye can be prevented from being deteriorated by ultraviolet rays.
  • the transmittance in the present invention is measured by a method perpendicular to the plane of the film, and can be measured using a spectrophotometer (for example, Hitachi U-3500 type).
  • the transmittance at a wavelength of 380 nm of the protective film of the present invention is achieved by adding an ultraviolet absorber in the film or by applying a coating solution containing the ultraviolet absorber on the film surface. It is desirable to appropriately adjust the type, concentration, and thickness of the ultraviolet absorber.
  • the ultraviolet absorber used in the present invention is a known substance. Examples of the ultraviolet absorber include an organic ultraviolet absorber and an inorganic ultraviolet absorber, and an organic ultraviolet absorber is preferable from the viewpoint of transparency. Examples of the organic ultraviolet absorber include benzotriazole, benzophenone, cyclic imino ester, and combinations thereof, but are not particularly limited as long as the absorbance is within the range defined by the present invention.
  • benzotoazole and cyclic imino ester are particularly preferable.
  • ultraviolet rays having different wavelengths can be absorbed simultaneously, so that the ultraviolet absorption effect can be further improved.
  • benzophenone ultraviolet absorber examples include 2- [2′-hydroxy-5 ′-(methacryloyloxymethyl) phenyl] -2H-benzotriazole, 2- [2 ′.
  • cyclic imino ester UV absorbers examples include 2,2 ′-(1,4-phenylene).
  • additives include inorganic particles, heat resistant polymer particles, alkali metal compounds, alkaline earth metal compounds, phosphorus compounds, antistatic agents, light proofing agents, flame retardants, thermal stabilizers, antioxidants, and antigelling agents. And surfactants.
  • a polyester film does not contain a particle
  • “Substantially free of particles” means, for example, in the case of inorganic particles, when the inorganic element is quantified by fluorescent X-ray analysis, the content is 50 ppm or less, preferably 10 ppm or less, particularly preferably the detection limit or less. Means quantity.
  • the oriented polyester film of the present invention can be subjected to corona treatment, coating treatment, flame treatment or the like in order to improve the adhesion to the polarizer.
  • At least one surface of the film of the present invention has an easy-adhesion layer mainly composed of at least one of a polyester resin, a polyurethane resin or a polyacrylic resin.
  • the “main component” refers to a component that is 50% by mass or more of the solid components constituting the easy-adhesion layer.
  • the coating solution used for forming the easy-adhesion layer of the present invention is preferably an aqueous coating solution containing at least one of water-soluble or water-dispersible copolymerized polyester resin, acrylic resin, and polyurethane resin.
  • coating solutions include water-soluble or water-dispersible co-polymers disclosed in Japanese Patent No. 3567927, Japanese Patent No. 3589232, Japanese Patent No. 3589233, Japanese Patent No. 3900191, and Japanese Patent No. 4150982.
  • coating solutions include a polymerized polyester resin solution, an acrylic resin solution, and a polyurethane resin solution.
  • the easy-adhesion layer can be obtained by applying the coating solution on one or both sides of a uniaxially stretched film in the longitudinal direction, drying at 100 to 150 ° C., and further stretching in the transverse direction.
  • the final coating amount of the easy adhesion layer after drying is preferably controlled to 0.05 to 0.20 g / m 2 . If the coating amount is less than 0.05 g / m 2 , the adhesion with the resulting polarizer may be insufficient. On the other hand, when the coating amount exceeds 0.20 g / m 2 , blocking resistance may be lowered.
  • the application quantity of an easily bonding layer on both surfaces may be the same or different, and can be independently set within the above range.
  • particles it is preferable to add particles to the easy-adhesion layer in order to impart slipperiness. It is preferable to use particles having an average particle size of 2 ⁇ m or less. When the average particle diameter of the particles exceeds 2 ⁇ m, the particles easily fall off from the coating layer.
  • particles to be included in the easy adhesion layer for example, titanium oxide, barium sulfate, calcium carbonate, calcium sulfate, silica, alumina, talc, kaolin, clay, calcium phosphate, mica, hectorite, zirconia, tungsten oxide, lithium fluoride,
  • examples include inorganic particles such as calcium fluoride, and organic polymer particles such as styrene, acrylic, melamine, benzoguanamine, and silicone. These may be added alone to the easy-adhesion layer, or may be added in combination of two or more.
  • a known method can be used as a method for applying the coating solution.
  • reverse roll coating method gravure coating method, kiss coating method, roll brush method, spray coating method, air knife coating method, wire bar coating method, pipe doctor method, etc.
  • spray coating method air knife coating method, wire bar coating method, pipe doctor method, etc.
  • wire bar coating method wire bar coating method
  • pipe doctor method etc.
  • the average particle size of the above particles is measured by the following method. Take a picture of the particles with a scanning electron microscope (SEM) and take the largest diameter of 300-500 particles (between the two most distant points) at a magnification such that the size of one smallest particle is 2-5 mm. Distance) is measured, and the average value is taken as the average particle diameter.
  • SEM scanning electron microscope
  • the oriented polyester film which is the protective film of the present invention, can be manufactured according to a general polyester film manufacturing method.
  • the polyester resin is melted and the non-oriented polyester extruded and formed into a sheet shape is stretched in the longitudinal direction by utilizing the speed difference of the roll at a temperature equal to or higher than the glass transition temperature, and then stretched in the transverse direction by a tenter.
  • the method of performing heat processing is mentioned.
  • the oriented polyester film of the present invention may be a uniaxially stretched film or a biaxially stretched film, but when the biaxially stretched film is used as a polarizer protective film, it is observed from directly above the film surface. Although rainbow-like color spots are not seen, rainbow-like color spots may be observed when observed from an oblique direction.
  • the cause of this phenomenon is that the biaxially stretched film is composed of refractive index ellipsoids having different refractive indexes in the running direction, the width direction, and the thickness direction, and the retardation becomes zero due to the light transmission direction inside the film ( This is because there is a direction in which the refractive index ellipsoid appears to be a perfect circle. Therefore, when the liquid crystal display screen is observed from a specific oblique direction, a point where the retardation becomes zero may be generated, and a rainbow-like color spot is generated concentrically around that point.
  • the angle ⁇ increases as the birefringence in the film increases, and the rainbow-like color increases. Spots are difficult to see.
  • the biaxially stretched film tends to reduce the angle ⁇ , and therefore the uniaxially stretched film is more preferable because rainbow-like color spots are less visible.
  • the present invention has biaxiality (biaxial symmetry) in a range that does not substantially cause rainbow-like color spots or a range that does not cause rainbow-like color spots in a viewing angle range required for a liquid crystal display screen. It is preferable.
  • the present inventors specify the ratio of the retardation of the protective film (in-plane retardation) and the retardation in the thickness direction (Rth) as a means to suppress the occurrence of rainbow spots while maintaining the mechanical strength of the protective film. It was found that control was performed so as to be within the range. Thickness direction retardation means an average of retardation obtained by multiplying two birefringences ⁇ Nxz and ⁇ Nyz by film thickness d when the film is viewed from the cross section in the thickness direction. The smaller the difference between the in-plane retardation and the thickness direction retardation, the more isotropic the birefringence action due to the observation angle, and the smaller the change in retardation due to the observation angle. Therefore, it is considered that rainbow-like color spots due to the observation angle are less likely to occur.
  • the ratio of the retardation of the polyester film of the present invention to the retardation in the thickness direction (Re / Rth) is preferably 0.200 or more, more preferably 0.500 or more, and further preferably 0.600 or more.
  • the ratio of the retardation to the retardation in the thickness direction (Re / Rth) is larger, the birefringence action is more isotropic, and the occurrence of iridescent color spots due to the observation angle is less likely to occur.
  • the ratio of the retardation to the retardation in the thickness direction (Re / Rth) is 2.0.
  • the mechanical strength in the direction orthogonal to the orientation direction is significantly lowered as the film approaches a complete uniaxial (uniaxial symmetry) film.
  • the ratio of the retardation of the polyester film of the present invention to the retardation in the thickness direction is preferably 1.2 or less, more preferably 1.0 or less.
  • the ratio of the retardation to the thickness direction retardation (Re / Rth) does not have to be 2.0, and 1.2 or less is sufficient. is there. Even if the ratio is 1.0 or less, it is possible to satisfy the viewing angle characteristics (180 degrees left and right, 120 degrees up and down) required for the liquid crystal display device.
  • the longitudinal stretching temperature and the transverse stretching temperature are preferably 80 to 130 ° C, particularly preferably 90 to 120 ° C.
  • the longitudinal draw ratio is preferably 1.0 to 3.5 times, particularly preferably 1.0 to 3.0 times.
  • the transverse draw ratio is preferably 2.5 to 6.0 times, and particularly preferably 3.0 to 5.5 times.
  • the ratio of the longitudinal draw ratio and the transverse draw ratio In order to control the retardation within the above range, it is preferable to control the ratio of the longitudinal draw ratio and the transverse draw ratio. If the difference between the vertical and horizontal draw ratios is too small, it is difficult to increase the retardation, which is not preferable.
  • setting the stretching temperature low is a preferable measure for increasing the retardation.
  • the treatment temperature is preferably from 100 to 250 ° C., particularly preferably from 180 to 245 ° C.
  • the thickness unevenness of the film is small. Since the stretching temperature and the stretching ratio greatly affect the thickness variation of the film, it is necessary to optimize the film forming conditions from the viewpoint of the thickness variation. In particular, when the longitudinal draw ratio is lowered to increase the retardation, the value of the longitudinal thickness unevenness may be increased. Since there is a region where the vertical thickness unevenness becomes extremely high within a specific range of the draw ratio, it is desirable to set the film forming conditions outside this range.
  • the thickness unevenness of the film of the present invention is preferably 5.0% or less, more preferably 4.5% or less, still more preferably 4.0% or less, and 3.0% or less. It is particularly preferred.
  • the retardation of the film can be controlled within a specific range by appropriately setting the stretching ratio, the stretching temperature, and the thickness of the film. For example, it becomes easier to obtain a higher retardation as the stretching ratio between the longitudinal stretching and the lateral stretching is higher, the stretching temperature is lower, and the film is thicker. On the contrary, it becomes easier to obtain a lower retardation as the stretching ratio between the longitudinal stretching and the lateral stretching is lower, the stretching temperature is higher, and the film thickness is thinner. Moreover, the higher the stretching temperature and the lower the total stretching ratio, the easier it is to obtain a film having a lower ratio of retardation to thickness direction (Re / Rth).
  • the lower the stretching temperature and the higher the total stretching ratio the easier it is to obtain a film with a higher ratio of retardation to thickness direction retardation (Re / Rth).
  • the final film forming conditions must be set in consideration of the physical properties necessary for processing in addition to the retardation control.
  • the thickness of the oriented polyester film of the present invention is arbitrary, but it is preferably in the range of 15 to 300 ⁇ m, more preferably in the range of 15 to 200 ⁇ m. In principle, it is possible to obtain a retardation of 3000 nm or more even with a film having a thickness of less than 15 ⁇ m. However, in that case, the anisotropy of the mechanical properties of the film becomes remarkable, and it becomes easy to cause tearing, tearing, etc., and the practicality as an industrial material is remarkably lowered. A particularly preferable lower limit of the thickness is 25 ⁇ m.
  • the upper limit of the thickness of the polarizer protective film exceeds 300 ⁇ m, the thickness of the polarizing plate becomes too thick, which is not preferable.
  • the upper limit of the thickness is preferably 200 ⁇ m.
  • a particularly preferable upper limit of the thickness is 100 ⁇ m, which is about the same as a general TAC film.
  • Polyethylene terephthalate is preferable as the polyester used as the film substrate in order to control the retardation within the range of the present invention even in the above thickness range.
  • a known method can be used in combination.
  • a preliminarily kneaded extruder is used to blend the dried ultraviolet absorber and the polymer raw material.
  • a master batch can be prepared and blended by, for example, a method of mixing the predetermined master batch and a polymer raw material during film formation.
  • the addition weight of the ultraviolet absorber added to the film is preferably 0.3 to 1.5%, more preferably 0.4 to 1.0%.
  • the concentration of the UV absorber in the master batch is preferably 5 to 30% by mass in order to uniformly disperse the UV absorber and mix it economically.
  • a condition for producing the master batch it is preferable to use a kneading extruder and to extrude at a temperature not lower than the melting point of the polyester raw material and not higher than 290 ° C. for 1 to 15 minutes. Above 290 ° C, the weight loss of the UV absorber is large, and the viscosity of the master batch is greatly reduced.
  • the residence time is 1 minute or less, uniform mixing of the ultraviolet absorber becomes difficult.
  • a stabilizer, a color tone adjusting agent, and an antistatic agent may be added.
  • the film has a multilayer structure of at least three layers, and an ultraviolet absorber is added to the intermediate layer of the film.
  • a film having a three-layer structure containing an ultraviolet absorber in the intermediate layer can be specifically produced as follows. Polyester pellets alone for the outer layer, master batches containing UV absorbers for the intermediate layer and polyester pellets are mixed at a predetermined ratio, dried, and then supplied to a known melt laminating extruder, which is slit-shaped. Extruded into a sheet form from a die and cooled and solidified on a casting roll to make an unstretched film.
  • a three-layer manifold or a merging block for example, a merging block having a square merging portion
  • a film layer constituting both outer layers and a film layer constituting an intermediate layer are laminated
  • An unstretched film is formed by extruding a three-layer sheet from the die and cooling with a casting roll.
  • the filter particle size (initial filtration efficiency 95%) of the filter medium used for high-precision filtration of the molten resin is preferably 15 ⁇ m or less. When the filter particle size of the filter medium exceeds 15 ⁇ m, removal of foreign matters of 20 ⁇ m or more tends to be insufficient.
  • the biaxial refractive index anisotropy ( ⁇ Nxy) was determined by the following method. Using a molecular orientation meter (MOA-6004 type molecular orientation meter, manufactured by Oji Scientific Instruments Co., Ltd.), the orientation principal axis direction of the film is obtained and 4 cm ⁇ 2 cm so that the orientation principal axis direction is parallel to the long side of the measurement sample.
  • MOA-6004 type molecular orientation meter manufactured by Oji Scientific Instruments Co., Ltd.
  • a rectangle was cut out and used as a measurement sample.
  • the biaxial refractive index (Nx, Ny) perpendicular to each other and the refractive index (Nz) in the thickness direction were determined by an Abbe refractometer (Atago Co., Ltd., NAR-4T, measurement wavelength 589 nm).
  • ) of the axis was defined as the anisotropy ( ⁇ Nxy) of the refractive index.
  • the thickness d (nm) of the film was measured using an electric micrometer (manufactured by Fine Reef, Millitron 1245D), and the unit was converted to nm.
  • Retardation (Re) was determined from the product ( ⁇ Nxy ⁇ d) of refractive index anisotropy ( ⁇ Nxy) and film thickness d (nm).
  • ) and ⁇ Nyz (
  • a polarizing plate was prepared by attaching a TAC film (manufactured by Fuji Film Co., Ltd., thickness 80 ⁇ m) to the opposite surface. The obtained polarizing plate was placed on both sides of the liquid crystal so that each polarizing plate was in a crossed Nicols condition to produce a liquid crystal display device.
  • each polarizing plate was arrange
  • each polarizing plate was arrange
  • shaft of a polarizer protective film becomes mutually perpendicular
  • a white LED composed of a light emitting element in which a blue light emitting diode and a yttrium / aluminum / garnet yellow phosphor were combined was used as a light source (Nichia Chemical, NSPW500CS). Visual observation was performed from the front and oblique directions of the polarizing plate of such a liquid crystal display device, and the presence or absence of rainbow spots was determined as follows.
  • A No iridescence from any direction.
  • B When observed from an oblique direction, a thin rainbow can be observed depending on the angle.
  • C Iris can be observed when observed from an oblique direction.
  • D Iris can be observed when observed from the front and diagonal directions.
  • Tear Strength The tear strength of each film was measured according to JIS P-8116 using an Elmendorf tear tester manufactured by Toyo Seiki Seisakusho. The tearing direction was performed so as to be parallel to the orientation main axis direction of the film, and was determined as follows. ⁇ : Tear strength is 50 mN or more ⁇ : Tear strength is less than 50 mN
  • the obtained polyethylene terephthalate resin (A) had an intrinsic viscosity of 0.62 dl / g and contained substantially no inert particles and internally precipitated particles. (Hereafter, abbreviated as PET (A).)
  • PET (B) 10 parts by weight of a dried UV absorber (2,2 ′-(1,4-phenylene) bis (4H-3,1-benzoxazinon-4-one), PET (A) containing no particles (inherent viscosity Was 0.62 dl / g) and 90 parts by mass were mixed, and a polyethylene terephthalate resin (B) containing an ultraviolet absorber was obtained using a kneading extruder (hereinafter abbreviated as PET (B)).
  • a transesterification reaction and a polycondensation reaction were carried out by a conventional method, and as a dicarboxylic acid component (based on the total dicarboxylic acid component) 46 mol% terephthalic acid, 46 mol% isophthalic acid and 8 mol% sodium 5-sulfonatoisophthalate, A water-dispersible sulfonic acid metal base-containing copolymer polyester resin having a composition of 50 mol% ethylene glycol and 50 mol% neopentyl glycol as a glycol component (based on the entire glycol component) was prepared.
  • PET protective film 1 After drying 90 parts by mass of PET (A) resin pellets containing no particles as a raw material for the base film intermediate layer and 10 parts by mass of PET (B) resin pellets containing an ultraviolet absorber at 135 ° C. for 6 hours under reduced pressure (1 Torr) , And supplied to the extruder 2 (for the intermediate layer II layer). Also, the PET (A) was dried by an ordinary method and supplied to the extruder 1 (for the outer layer I layer and the outer layer III), and dissolved at 285 ° C. .
  • the unstretched film on which this coating layer was formed was guided to a tenter stretching machine, guided to a hot air zone at a temperature of 125 ° C. while being gripped by a clip, and stretched 4.0 times in the width direction.
  • the film was treated at a temperature of 225 ° C. for 30 seconds and further subjected to a relaxation treatment of 3% in the width direction to obtain a uniaxially oriented PET film having a film thickness of about 50 ⁇ m.
  • Table 1 below shows the results of rainbow spot observation and tear strength measurement of the liquid crystal display devices produced using the polarizer protective films 1 to 11 as described above.
  • “relationship between orientation principal axes” means a relation between orientation principal axes of an oriented polyester film used as a protective film for two polarizing plates in a liquid crystal display device.
  • the polarizer protective film No. 1-1 shows the case where the polarizer protective film 1 is used as the polarizer protective film and the cold cathode tube is used as the light source.
  • Polarizer protective film No. 1-2 is a polarizer protective film No. 1-2.
  • a pair of polarized light so that the angle formed by the orientation main axis of the polarizer protective film of the polarizing plate on the light source side and the orientation main axis of the polarizer protective film of the polarizing plate on the viewing side is 8 ° (substantially parallel).
  • Polarizer protective film No. 1-3 is a polarizer protective film No. 1-3.
  • a pair of polarized light so that the angle formed by the orientation main axis of the polarizer protective film of the polarizing plate on the light source side and the orientation main axis of the polarizer protective film of the polarizing plate on the viewing side is 4 ° (substantially parallel).
  • a board is arrange
  • the polarizing plate and the polarizer protective film of the present invention By using the liquid crystal display device, the polarizing plate and the polarizer protective film of the present invention, it becomes possible to contribute to thinning and cost reduction of LCD without reducing visibility due to rainbow-like color spots.
  • the above availability is very high.

Abstract

Le but de la présente invention est de diminuer encore l'apparition d'irrégularités spectrales dans un dispositif d'affichage à cristaux liquides qui utilise une diode électroluminescente comme source de lumière et utilise un film polyester orienté ayant un retard donné comme film protecteur de polariseur.　Ce dispositif d'affichage à cristaux liquides comprend une source lumineuse de rétroéclairage, deux plaques polarisantes et une cellule à cristaux liquides disposée entre les deux plaques polarisantes. La source lumineuse de rétroéclairage est une source de lumière blanche ayant un spectre d'émission continu. Les deux plaques polarisantes sont chacune formées à partir d'un polariseur et de films protecteurs des deux côtés du polariseur. Au moins l'un des films protecteurs situés de chaque côté est un film polyester orienté ayant un retard de 3 000 à 30 000 nm. Les axes d'orientation principaux des films polyester orientés constituant les deux plaques polarisantes sont sensiblement parallèles l'un à l'autre.
PCT/JP2012/080561 2011-11-29 2012-11-27 Dispositif d'affichage à cristaux liquides, plaque polarisante et film protecteur de polariseur WO2013080948A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
KR1020147016781A KR101947854B1 (ko) 2011-11-29 2012-11-27 액정표시장치, 편광판 및 편광자 보호 필름
JP2013547151A JP5614506B2 (ja) 2011-11-29 2012-11-27 液晶表示装置、偏光板および偏光子保護フィルム
CN201280058791.2A CN103959149B (zh) 2011-11-29 2012-11-27 液晶显示装置、偏光板和偏振片保护膜

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2011259848 2011-11-29
JP2011-259848 2011-11-29

Publications (1)

Publication Number Publication Date
WO2013080948A1 true WO2013080948A1 (fr) 2013-06-06

Family

ID=48535403

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2012/080561 WO2013080948A1 (fr) 2011-11-29 2012-11-27 Dispositif d'affichage à cristaux liquides, plaque polarisante et film protecteur de polariseur

Country Status (5)

Country Link
JP (1) JP5614506B2 (fr)
KR (1) KR101947854B1 (fr)
CN (1) CN103959149B (fr)
TW (1) TWI502257B (fr)
WO (1) WO2013080948A1 (fr)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015060276A1 (fr) * 2013-10-23 2015-04-30 日東電工株式会社 Corps stratifié
WO2015122520A1 (fr) * 2014-02-17 2015-08-20 大日本印刷株式会社 Stratifié, méthode de fabrication de stratifié, dispositif d'affichage d'image, méthode de fabrication de dispositif d'affichage d'image, et méthode d'amélioration de transmittance de lumière de plaque polarisante
JP2016099553A (ja) * 2014-11-25 2016-05-30 東洋紡株式会社 液晶表示装置及び偏光板
JP2017062500A (ja) * 2016-12-06 2017-03-30 大日本印刷株式会社 偏光板、偏光板の製造方法、画像表示装置、画像表示装置の製造方法及び偏光板の光透過率改善方法
JP2017122918A (ja) * 2015-04-10 2017-07-13 東洋紡株式会社 液晶表示装置
JP2018028667A (ja) * 2012-05-15 2018-02-22 大日本印刷株式会社 積層基材、積層体、偏光板、液晶表示パネルおよび画像表示装置
CN110573942A (zh) * 2017-04-28 2019-12-13 株式会社Lg化学 光调制装置
JPWO2020026891A1 (ja) * 2018-07-31 2021-08-26 東洋紡株式会社 偏光子保護用ポリエステルフィルム及び液晶表示装置

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20150027684A (ko) * 2013-08-29 2015-03-12 삼성에스디아이 주식회사 편광판, 이의 제조방법 및 이를 포함하는 액정표시장치
KR101758432B1 (ko) 2014-08-29 2017-07-17 삼성에스디아이 주식회사 편광판 및 이를 포함하는 액정표시장치
KR101813438B1 (ko) * 2015-03-04 2018-01-30 도요보 가부시키가이샤 액정표시장치
KR20180023953A (ko) * 2015-07-16 2018-03-07 도요보 가부시키가이샤 액정 표시 장치 및 편광판
JP2017107152A (ja) * 2015-11-30 2017-06-15 東洋紡株式会社 液晶表示装置

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58143305A (ja) * 1982-02-22 1983-08-25 Hitachi Ltd 表示パネル
JPS6026304A (ja) * 1983-07-22 1985-02-09 Nitto Electric Ind Co Ltd 偏光板
JP2010096948A (ja) * 2008-10-16 2010-04-30 Seiko Epson Corp 光学フィルム、液晶装置の製造方法
JP2010243630A (ja) * 2009-04-02 2010-10-28 Mitsubishi Plastics Inc 偏光板保護用ポリエステルフィルム

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5977401A (ja) * 1982-09-22 1984-05-02 Nitto Electric Ind Co Ltd 偏光板
JP2004226591A (ja) * 2003-01-22 2004-08-12 Fuji Photo Film Co Ltd 液晶表示装置および偏光板
TW200712579A (en) * 2005-08-12 2007-04-01 Dainippon Printing Co Ltd Protective film for polarizing plate and polarizing plate
KR20100106838A (ko) * 2009-03-24 2010-10-04 동우 화인켐 주식회사 복합구성 편광판 세트 및 이를 포함하는 면상 스위칭 모드 액정표시장치
JP4888853B2 (ja) * 2009-11-12 2012-02-29 学校法人慶應義塾 液晶表示装置の視認性改善方法、及びそれを用いた液晶表示装置
JP5377252B2 (ja) * 2009-11-27 2013-12-25 日東電工株式会社 画像表示装置
JP5396439B2 (ja) * 2011-07-22 2014-01-22 学校法人慶應義塾 液晶表示装置の視認性改善方法、及びそれを用いた液晶表示装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58143305A (ja) * 1982-02-22 1983-08-25 Hitachi Ltd 表示パネル
JPS6026304A (ja) * 1983-07-22 1985-02-09 Nitto Electric Ind Co Ltd 偏光板
JP2010096948A (ja) * 2008-10-16 2010-04-30 Seiko Epson Corp 光学フィルム、液晶装置の製造方法
JP2010243630A (ja) * 2009-04-02 2010-10-28 Mitsubishi Plastics Inc 偏光板保護用ポリエステルフィルム

Cited By (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2018028667A (ja) * 2012-05-15 2018-02-22 大日本印刷株式会社 積層基材、積層体、偏光板、液晶表示パネルおよび画像表示装置
WO2015060276A1 (fr) * 2013-10-23 2015-04-30 日東電工株式会社 Corps stratifié
WO2015122520A1 (fr) * 2014-02-17 2015-08-20 大日本印刷株式会社 Stratifié, méthode de fabrication de stratifié, dispositif d'affichage d'image, méthode de fabrication de dispositif d'affichage d'image, et méthode d'amélioration de transmittance de lumière de plaque polarisante
JP2015152837A (ja) * 2014-02-17 2015-08-24 大日本印刷株式会社 積層体、積層体の製造方法、画像表示装置、画像表示装置の製造方法及び偏光板の光透過率改善方法
KR20160120749A (ko) * 2014-02-17 2016-10-18 다이니폰 인사츠 가부시키가이샤 적층체, 적층체의 제조 방법, 화상 표시 장치, 화상 표시 장치의 제조 방법 및 편광판의 광투과율 개선 방법
KR102220271B1 (ko) * 2014-02-17 2021-02-25 다이니폰 인사츠 가부시키가이샤 적층체, 적층체의 제조 방법, 화상 표시 장치, 화상 표시 장치의 제조 방법 및 편광판의 광투과율 개선 방법
JP2016099553A (ja) * 2014-11-25 2016-05-30 東洋紡株式会社 液晶表示装置及び偏光板
JP2017122918A (ja) * 2015-04-10 2017-07-13 東洋紡株式会社 液晶表示装置
JP7131598B2 (ja) 2015-04-10 2022-09-06 東洋紡株式会社 液晶表示装置
JP2021056519A (ja) * 2015-04-10 2021-04-08 東洋紡株式会社 液晶表示装置
JP2017062500A (ja) * 2016-12-06 2017-03-30 大日本印刷株式会社 偏光板、偏光板の製造方法、画像表示装置、画像表示装置の製造方法及び偏光板の光透過率改善方法
JP2020518014A (ja) * 2017-04-28 2020-06-18 エルジー・ケム・リミテッド 光変調デバイス
US11314106B2 (en) 2017-04-28 2022-04-26 Lg Chem, Ltd. Light modulation device
JP2020518006A (ja) * 2017-04-28 2020-06-18 エルジー・ケム・リミテッド 光変調デバイス
JP2020518013A (ja) * 2017-04-28 2020-06-18 エルジー・ケム・リミテッド 光変調デバイス
US11009725B2 (en) 2017-04-28 2021-05-18 Lg Chem, Ltd. Light modulation device
US11536987B2 (en) 2017-04-28 2022-12-27 Lg Chem, Ltd. Light modulation device
US11262600B2 (en) 2017-04-28 2022-03-01 Lg Chem, Ltd. Light modulation device
JP2020518007A (ja) * 2017-04-28 2020-06-18 エルジー・ケム・リミテッド 光変調デバイス
CN110573942B (zh) * 2017-04-28 2022-05-13 株式会社Lg化学 光调制装置
US11347080B2 (en) 2017-04-28 2022-05-31 Lg Chem, Ltd. Light modulation device
CN110573942A (zh) * 2017-04-28 2019-12-13 株式会社Lg化学 光调制装置
US11506915B2 (en) 2017-04-28 2022-11-22 Lg Chem, Ltd. Light modulation device
JPWO2020026891A1 (ja) * 2018-07-31 2021-08-26 東洋紡株式会社 偏光子保護用ポリエステルフィルム及び液晶表示装置
JP7327401B2 (ja) 2018-07-31 2023-08-16 東洋紡株式会社 偏光子保護用ポリエステルフィルム及び液晶表示装置

Also Published As

Publication number Publication date
CN103959149B (zh) 2017-03-08
CN103959149A (zh) 2014-07-30
JPWO2013080948A1 (ja) 2015-04-27
KR20140104444A (ko) 2014-08-28
JP5614506B2 (ja) 2014-10-29
TW201329584A (zh) 2013-07-16
TWI502257B (zh) 2015-10-01
KR101947854B1 (ko) 2019-02-13

Similar Documents

Publication Publication Date Title
JP6179548B2 (ja) 液晶表示装置、偏光板および偏光子保護フィルム
JP5472519B2 (ja) 液晶表示装置、偏光板および偏光子保護フィルム
JP5614506B2 (ja) 液晶表示装置、偏光板および偏光子保護フィルム
JP6443048B2 (ja) 液晶表示装置、偏光板及び偏光子保護フィルム
JP2015111208A (ja) 偏光子保護フィルム、偏光板及び液晶表示装置
WO2017010444A1 (fr) Dispositif d'affichage à cristaux liquides et plaque polarisante
JP2015111207A (ja) 偏光子保護フィルム、偏光板及び液晶表示装置
JP6337481B2 (ja) 偏光子保護フィルム、偏光板及液晶表示装置
JP2018028612A (ja) 液晶表示装置
JP6521216B2 (ja) 液晶表示装置及び偏光板
JP6337474B2 (ja) 偏光子保護フィルム、偏光板及び液晶表示装置
JP2015079129A (ja) 液晶表示装置、偏光板及び偏光子保護フィルム
JP2015111206A (ja) 偏光子保護フィルム、偏光板及び液晶表示装置

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 12853939

Country of ref document: EP

Kind code of ref document: A1

ENP Entry into the national phase

Ref document number: 2013547151

Country of ref document: JP

Kind code of ref document: A

NENP Non-entry into the national phase

Ref country code: DE

ENP Entry into the national phase

Ref document number: 20147016781

Country of ref document: KR

Kind code of ref document: A

122 Ep: pct application non-entry in european phase

Ref document number: 12853939

Country of ref document: EP

Kind code of ref document: A1