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
  • 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
• • G—PHYSICS
  • G02—OPTICS
  • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
  • G02B5/00—Optical elements other than lenses
  • G02B5/30—Polarising elements
• • 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
• • 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
  • G02F1/1336—Illuminating devices
  • G02F1/133602—Direct backlight
  • G02F1/133603—Direct backlight with LEDs
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
  • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
  • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps

Definitions

• the present invention relates to a liquid crystal display device and a polarizing plate. Specifically, the present invention relates to a liquid crystal display device and a polarizing plate in which generation of rainbow-like color spots is reduced.
• 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 polyester films have been proposed as inexpensive alternative materials (Patent Documents 1 to 3), but there is a problem that rainbow-like color spots are observed.
• the polarization state of the linearly polarized light emitted from the backlight unit or the polarizer changes 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, resulting in a rainbow-like color spot (see: Proceedings of the 15th Micro Optical Conference Proceedings, No. 1) 30-31).
• a white light source having a continuous and broad emission spectrum such as a white light emitting diode as a backlight light source, and further using an oriented polyester film having a certain retardation as a polarizer protective film.
• Patent Document 4 White light emitting diodes have a continuous and broad emission spectrum in the visible light region. Therefore, paying attention to the envelope shape of the interference color spectrum due to the transmitted light that has passed through the birefringent body, by controlling the retardation of the oriented polyester film, a spectrum similar to the emission spectrum of the light source can be obtained, and the suppression of rainbow spots It has been proposed to be possible.
• the linearly polarized light emitted from the polarizer passes through the oriented polyester film while maintaining the polarization state. Further, by increasing the uniaxial orientation by controlling the birefringence of the oriented polyester film, light incident from an oblique direction also passes through while maintaining the polarization state.
• a displacement occurs in the orientation main axis direction as compared to when viewed from directly above.
• the uniaxial orientation is high, the displacement in the orientation principal axis direction when viewed from the oblique direction is reduced.
• the emission spectrum peaks in each wavelength region of blue region (400 nm to less than 495 nm), green region (495 nm to less than 600 nm) and red region (600 nm to 780 nm or less).
• a white light-emitting diode (for example, a blue light-emitting diode and at least K 2 SiF 6 as a phosphor) having an emission spectrum that has a top and a half-width of a peak in a red region (600 nm to 780 nm or less) is relatively narrow (less than 5 nm):
• a liquid crystal display device using a backlight source composed of a white light emitting diode having a fluoride phosphor such as Mn 4+ has been developed.
• the transmission axis of the polarizer and the fast axis direction of the polyester film are usually arranged to be perpendicular to each other. Is done. This is because the polyvinyl alcohol film that is a polarizer is manufactured by longitudinal uniaxial stretching, and the polyester film that is the protective film is manufactured by longitudinal stretching and then lateral stretching, so that the polyester film orientation This is because the main axis direction is the horizontal direction, and when these long objects are bonded together to produce a polarizing plate, the fast axis of the polyester film and the transmission axis of the polarizer are usually perpendicular.
• an oriented polyester film having a specific retardation is used as the polyester film, and, for example, a white LED composed of a light emitting element in which a blue light emitting diode and a yttrium / aluminum / garnet yellow phosphor are combined is used as a backlight light source.
• a white LED composed of a light emitting element in which a blue light emitting diode and a yttrium / aluminum / garnet yellow phosphor are combined is used as a backlight light source.
• an object of the present invention is to have a peak top of an emission spectrum in each wavelength region of a blue region (400 nm or more and less than 495 nm), a green region (495 nm or more and less than 600 nm), and a red region (600 nm or more and 780 nm or less).
• a polyester film is used as a polarizer protective film in a liquid crystal display device having a backlight light source composed of a white light emitting diode having an emission spectrum having a relatively narrow half-width (less than 5 nm) in the region (600 nm or more and 780 nm or less).
• it is to provide a liquid crystal display device and a polarizing plate in which rainbow spots are suppressed.
• 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 has a peak top of the emission spectrum in each wavelength region of 400 nm to 495 nm, 495 nm to less than 600 nm, and 600 nm to 780 nm, and has the highest peak intensity in the wavelength region of 600 nm to 780 nm.
• the emission spectrum of the backlight source is The full width at half maximum of the peak with the highest peak intensity in the wavelength region of 400 nm or more and less than 495 nm is 5 nm or more, The full width at half maximum of the peak with the highest peak intensity in the wavelength region of 495 nm or more and less than 600 nm is 5 nm or more, Item 2.
• a liquid crystal display device according to item 1. Item 3.
• Item 3. The liquid crystal display device according to Item 1 or 2, wherein a difference between a refractive index in the transmission axis direction of the polarizer and a refractive index of the polyester film in a direction parallel to the transmission axis of the polarizer is 0.12 or less. .
• the refractive index of the polyester film in the direction parallel to the transmission axis of the polarizer is 1.53 to 1.62.
• 400 nm or more, less than 495 nm, 495 nm or more, less than 600 nm, and 600 nm or more and 780 nm or less, each having a peak top of the emission spectrum, and the half-width of the peak with the highest peak intensity in the wavelength region of 600 nm or more and 780 nm or less is 5 nm
• the liquid crystal display device and polarizing plate of the present invention can ensure good visibility in which the occurrence of rainbow-like color spots is significantly suppressed at any viewing angle.
• a liquid crystal display device includes a rear module, a liquid crystal cell, and a front module in order from the side facing the backlight light source toward 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 arranged on the side facing the backlight light source in the rear module, and is arranged on the side (viewing side) displaying the image in the front module.
• the liquid crystal display device of the present invention includes at least a backlight light source, two polarizing plates, and a liquid crystal cell disposed between the two polarizing plates.
• the liquid crystal display device may appropriately have other components in addition to the backlight source, the polarizing plate, and the liquid crystal cell, such as a color filter, a lens film, a diffusion sheet, and an antireflection film.
• a brightness enhancement film may be provided between the light source side polarizing plate and the backlight light source.
• the brightness enhancement film include a reflective polarizing plate that transmits one linearly polarized light and reflects linearly polarized light orthogonal thereto.
• the reflective polarizing plate for example, a DBEF (Dual Brightness Enhancement Film) series brightness enhancement film manufactured by Sumitomo 3M Limited is preferably used.
• the reflective polarizing plate is usually arranged so that the absorption axis of the reflective polarizing plate and the absorption axis of the light source side polarizing plate are parallel to each other.
• At least one polarizing plate has a polyester film laminated on at least one surface of a polarizer in which iodine is dyed on polyvinyl alcohol (PVA) or the like. It is.
• the refractive index of the polyester film in the direction parallel to the transmission axis of the polarizer is preferably 1.53 to 1.62.
• a film having no birefringence such as a TAC film, an acrylic film, or a norbornene-based film is laminated on the other surface of the polarizer (a polarizing plate having a three-layer structure). There is no need to laminate a film on the other side (two-layer polarizing plate).
• a polyester film is used as a protective film on both sides of the polarizer, it is preferable that the slow axes of both polyester films are substantially parallel to each other.
• any polarizer (polarizing film) used in the technical field can be appropriately selected and used.
• typical polarizers include those obtained by dyeing a dichroic material such as iodine on a polyvinyl alcohol film or the like.
• the polarizer is not limited to this, and may be a known and later-developed polarizer. Can be appropriately selected and used.
• the dichroic material includes iodine, a diazo compound, a polymethine dye, and the like.
• the polarizer can be obtained by any method.
• a PVA film dyed with a dichroic material is uniaxially stretched in an aqueous boric acid solution, and washed and dried while maintaining the stretched state.
• the stretching ratio of uniaxial stretching is usually about 4 to 8 times, but is not particularly limited. Other manufacturing conditions and the like can be appropriately set according to known methods.
• the configuration of the backlight may be an edge light method using a light guide plate, a reflection plate, or the like, or a direct type, but in the present invention, as a backlight light source of a liquid crystal display device, 400 nm or more, less than 495 nm, 495 nm or more, less than 600 nm, and 600 nm or more and 780 nm or less, each having a peak top of the emission spectrum, and the half width of the peak with the highest peak intensity in the wavelength region of 600 nm or more and 780 nm or less
• a backlight light source consisting of a white light emitting diode having an emission spectrum of less than 5 nm is preferred.
• the upper limit of the full width at half maximum of the peak having the highest peak intensity in the wavelength region of 600 nm or more and 780 nm or less is preferably less than 5 nm, more preferably less than 4 nm, and still more preferably less than 3.5 nm.
• the lower limit is preferably 1 nm or more, and more preferably 1.5 nm or more. It is preferable that the half width of the peak is less than 5 nm because the color gamut of the liquid crystal display device is widened. Further, if the half width of the peak is less than 1 nm, the luminous efficiency may be deteriorated, which is not preferable.
• the shape of the emission spectrum is designed from the balance between the required color gamut and the luminous efficiency.
• the half width is the peak width (nm) at half the intensity of the peak intensity at the peak top wavelength.
• a backlight light source having an emission spectrum having the above-described characteristics is a technology that has been attracting attention due to the recent increasing demand for color gamut expansion.
• Conventionally used white LEDs for example, light-emitting elements that combine blue light-emitting diodes with yttrium, aluminum, and garnet yellow phosphors
• white LEDs for example, light-emitting elements that combine blue light-emitting diodes with yttrium, aluminum, and garnet yellow phosphors
• backlight light sources have a spectrum that can be recognized by the human eye. Only about 20% of colors can be reproduced.
• a backlight light source having an emission spectrum having the above-described characteristics it is said that it is possible to reproduce 60% or more of colors.
• the wavelength region of 400 nm or more and less than 495 nm is more preferably 430 nm or more and 470 nm or less.
• the wavelength region of 495 nm or more and less than 600 nm is more preferably 510 nm or more and 560 nm or less.
• the wavelength region of 600 nm to 780 nm is more preferably 600 nm to 700 nm, and even more preferably 610 nm to 680 mn.
• the peak half-width at the peak top of each wavelength region of the emission spectrum from 400 nm to less than 495 nm and from 495 nm to less than 600 nm is not particularly limited, but is from 400 nm to less than 495 nm
• the half-width of the peak having the highest peak intensity in the wavelength region is preferably 5 nm or more, and the half-width of the peak having the highest peak intensity in the wavelength region of from 495 nm to less than 600 nm is preferably 5 nm or more.
• the upper limit of the peak half width at the peak top of each wavelength region from 400 nm to less than 495 nm and from 495 nm to less than 600 nm is Preferably it is 140 nm or less, Preferably it is 120 nm or less, Preferably it is 100 nm or less, More preferably, it is 80 nm or less, More preferably, it is 60 nm or less, More preferably, it is 50 nm or less.
• a white light source having an emission spectrum having the above-described characteristics include a phosphor type white light emitting diode in which a blue light emitting diode and a phosphor are combined.
• the red phosphor among the phosphors include a fluoride phosphor (also referred to as “KSF”) whose composition formula is K 2 SiF 6 : Mn 4+ , and others.
• the Mn 4+ activated fluoride complex phosphor is a phosphor having Mn 4+ as an activator, a fluoride complex salt of an alkali metal, amine, or alkaline earth metal as a base crystal.
• Fluoride complexes that form host crystals include those whose coordination center is a trivalent metal (B, Al, Ga, In, Y, Sc, lanthanoid), and tetravalent metal (Si, Ge, Sn, Ti, Zr, Re, Hf) and pentavalent metals (V, P, Nb, Ta), and the number of fluorine atoms coordinated around them is 5-7.
• Mn 4+ activated fluoride complex phosphor examples include A 2 [MF 6 ]: Mn (A is one or more selected from Li, Na, K, Rb, Cs, NH 4 ; M is Ge, Si, One or more selected from Sn, Ti, Zr), E [MF 6 ]: Mn (E is one or more selected from Mg, Ca, Sr, Ba, Zn; M is selected from Ge, Si, Sn, Ti, Zr) Ba 0.65 , Zr 0.35 F 2.70 : Mn, A 3 [ZrF 7 ]: Mn (A is one or more selected from Li, Na, K, Rb, Cs, NH 4 ) , A 2 [MF 5 ]: Mn (A is one or more selected from Li, Na, K, Rb, Cs, NH 4 ; M is one or more selected from Al, Ga, In), A 3 [MF 6 ] : Mn (A one is selected Li, Na, K, Rb, Cs, from NH 4 ; M
• Mn 4+ activated fluoride complex phosphors is A 2 MF 6 : Mn (A is selected from Li, Na, K, Rb, Cs, NH 4) whose base crystal is a hexafluoro complex salt of an alkali metal.
• M is one or more selected from Ge, Si, Sn, Ti, and Zr).
• A is preferably one or more selected from K (potassium) or Na (sodium), and M is Si (silicon) or Ti (titanium).
• A is K (the ratio of K in the total amount of A is 99 mol% or more) and M is Si.
• the activation element is preferably 100% Mn (manganese), but Ti, Zr, Ge, Sn, Al, Ga, B, In, Cr, in a range of less than 10 mol% with respect to the total amount of the activation element. Fe, Co, Ni, Cu, Nb, Mo, Ru, Ag, Zn, Mg, and the like may be included.
• M is Si
• the ratio of Mn in the total of Si and Mn is preferably in the range of 0.5 mol% to 10 mol%.
• Mn 4+ activated fluoride complex phosphors have the chemical formula A 2 + x M y Mn z F n (A is Na and K; M is Si and Al; ⁇ 1 ⁇ x ⁇ 1 and 0.9 ⁇ y + z ⁇ 1) .1 and 0.001 ⁇ z ⁇ 0.4 and 5 ⁇ n ⁇ 7).
• the backlight light source is preferably a white light emitting diode having a blue light emitting diode and at least a fluoride phosphor as a phosphor, and particularly preferably a fluoride having at least K 2 SiF 6 : Mn 4+ as a blue light emitting diode and a phosphor.
• a white light emitting diode having a phosphor For example, commercially available products such as NSSW306FT, which is a white LED manufactured by Nichia Corporation, can be used.
• the green phosphor for example, a sialon phosphor having a basic composition of ⁇ -SiAlON: Eu or the like, or a silicate phosphor having a basic composition of (Ba, Sr) 2 SiO 4 : Eu or the like. Others are exemplified.
• the wavelength region of 495 nm or more and less than 600 nm, or the wavelength region of 600 nm or more and 780 nm or less the following is considered.
• the half width of the peak with the highest peak intensity is in the above range.
• the half-value width is similarly in the above range for other peaks having an intensity of 70% or more of the highest peak intensity.
• the half width of the peak having the highest peak intensity among the plurality of peaks can be used as it is.
• the independent peak has an intensity region that is 1 ⁇ 2 of the peak intensity on both the short wavelength side and the long wavelength side of the peak. That is, when a plurality of peaks overlap and each peak does not have a region having an intensity that is 1 ⁇ 2 of the peak intensity on both sides thereof, the plurality of peaks are regarded as one peak as a whole.
• the peak width (nm) at half the intensity of the highest peak intensity is set as the half width.
• the peak with the highest peak intensity is defined as the peak top.
• the peak having the highest peak intensity in each of the wavelength region of 400 nm or more and less than 495 nm, the wavelength region of 495 nm or more and less than 600 nm, or the wavelength region of 600 nm or more and 780 nm or less is independent from the peaks of other wavelength regions. It is preferable that the relationship is In particular, the wavelength region between the peak having the highest peak intensity in the wavelength region of 495 nm or more and less than 600 nm and the peak having the highest peak intensity in the region of 600 nm or more and 780 nm or less has a wavelength of 600 nm or more and 780 nm or less. It is preferable in terms of color clarity that there is a region that is 1/3 of the peak intensity of the peak having the highest peak intensity in the region.
• the emission spectrum of the backlight light source can be measured by using a spectroscope such as Hamamatsu Photonics multi-channel spectroscope PMA-12.
• the refractive index of the polyester film in the direction parallel to the transmission axis of the polarizer constituting the polarizing plate is in the range of 1.53 to 1.62. I found that I could suppress rainbow spots.
• the mechanism for suppressing the occurrence of rainbow-like color spots according to the above aspect is considered as follows.
• the polarization state of the linearly polarized light emitted from the backlight unit or the polarizer changes when passing through the polyester film.
• One of the factors that change the polarization state is considered to be the influence of the refractive index difference at the interface between the air layer and the oriented polyester film, or the refractive index difference at the interface between the polarizer and the oriented polyester film.
• the linearly polarized light incident on the oriented polyester film passes through each interface, part of the light is reflected by the difference in refractive index at the interface. At this time, the polarization state of both the outgoing light and the reflected light changes, which is considered to be one of the factors that cause rainbow-like color spots.
• each wavelength region of the blue region (400 nm or more and less than 495 nm), the green region (495 nm or more and less than 600 nm) and the red region (600 nm or more and 780 nm or less) has a peak top of the emission spectrum.
• a polarizing plate using a polyester film as a polarizer protective film is used.
• a polarizer protective film made of a polyester film is laminated on at least one surface of the polarizer.
• the refractive index of the polyester film in the direction parallel to the transmission axis direction of the polarizer is preferably adjusted to be low so as to be in the range of 1.53 to 1.62.
• reflection at the interface between the air layer and the polyester film and the interface between the polarizer and the polyester film can be suppressed, and rainbow-like color spots can be suppressed.
• the refractive index exceeds 1.62, rainbow-like color spots may occur when observed from an oblique direction.
• it is 1.61 or less, More preferably, it is 1.60 or less, More preferably, it is 1.59 or less, More preferably, it is 1.58 or less.
• the lower limit of the refractive index is 1.53.
• the refractive index is less than 1.53, crystallization of the polyester film becomes insufficient, and properties obtained by stretching such as dimensional stability, mechanical strength, and chemical resistance become insufficient.
• it is 1.54 or more, More preferably, it is 1.55 or more, More preferably, it is 1.56 or more, More preferably, it is 1.57 or more.
• the polarizing plate of the present invention has the transmission axis of the polarizer and the polyester film.
• the fast axis (the slow axis and the vertical method) is preferably substantially parallel.
• the refractive index in the fast axis direction (perpendicular to the slow axis) of the polyester film can be adjusted to a range of 1.53 to 1.62 by a stretching process in a film forming process described later.
• the refractive index of the polyester film in the direction parallel to the transmission axis direction of the polarizer is 1.53 to 1.62.
• a polarizing plate can be manufactured.
• substantially parallel means that the angle formed by the transmission axis of the polarizer and the fast axis of the polarizer protective 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 °, more preferably ⁇ 2 ° to 2 °, particularly preferably ⁇ 1 ° to 1 °.
• substantially parallel is substantially parallel.
• “substantially parallel” means that the transmission axis and the fast axis are parallel to such an extent that a deviation inevitably generated when the polarizer and the protective film are bonded together is allowed.
• the direction of the slow 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 refractive index in the fast axis direction of the polyester film used in the present invention is preferably 1.53 to 1.62, and the transmission axis of the polarizer and the fast axis of the polyester film are laminated so as to be substantially parallel.
• a polarizing plate having a refractive index of 1.53 or more and 1.62 or less in a direction parallel to the transmission axis of the polarizer can be produced.
• the difference between the refractive index in the transmission axis direction of the polarizer constituting the polarizing plate and the refractive index of the polyester film in the direction parallel to the transmission axis of the polarizer is preferably 0.12 or less, preferably 0.10. In the following, it is preferably 0.09 or less, preferably 0.08 or less, preferably 0.07 or less, preferably 0.06 or less, preferably 0.05 or less.
• the lower limit is zero.
• the polarizer is not particularly limited.
• a conventionally known polarizer such as one obtained by dyeing iodine on polyvinyl alcohol (PVA) or the like can be used.
• the refractive index in the transmission axis direction of the polarizer is preferably 1.41 to 1.56, more preferably 1.44 to 1.55, and even more preferably 1.47 to 1.54.
• the polyester film used for the polarizer protective film preferably has a retardation of 1500 to 30000 nm. If the retardation is in the above range, it is preferable because rainbow spots tend to be reduced more easily.
• the preferred lower limit of retardation is 3000 nm, the next preferred lower limit is 3500 nm, the more preferred lower limit is 4000 nm, the still more preferred lower limit is 6000 nm, and the still more preferred lower limit is 8000 nm.
• a preferable upper limit is 30000 nm, and a polyester film having a retardation larger than this has a considerably large thickness and tends to deteriorate the handleability as an industrial material.
• the retardation can be obtained by measuring the refractive index and thickness in two orthogonal directions on the film, or by using a commercially available automatic birefringence measuring device such as KOBRA-21ADH (Oji Scientific Instruments). You can also.
• the refractive index can be obtained by an Abbe refractometer (measurement wavelength: 589 nm).
• the ratio (Re / Rth) of the retardation of the polyester film (Re: in-plane retardation) to the retardation in the thickness direction (Rth) is preferably 0.2 or more, more preferably 0.5 or more, and still more preferably 0.8. 6 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 rainbow-like color spots depending on the observation angle tends to be less likely to occur.
• the ratio of the retardation to the retardation in the thickness direction (Re / Rth) is 2.0.
• the ratio of the retardation to the retardation in the thickness direction (Re / Rth)
• the upper limit is preferably 2.0.
• the thickness direction retardation means an average of retardation obtained by multiplying two birefringences ⁇ Nxz and ⁇ Nyz by the film thickness d when the film is viewed from the cross section in the thickness direction.
• the polarizer protective film made of the polyester film can be used for both the incident light side (light source side) and the outgoing light side (viewing side) polarizing plates.
• the polarizer protective film made of the polyester film is arranged on both sides, whether it is arranged on the incident light side starting from the polarizer or on the liquid crystal cell side. Although it may be arranged, it is preferably arranged at least on the incident light side.
• the polarizer protective film made of the above polyester film is arranged on both sides, whether it is arranged on the liquid crystal side starting from the polarizer or on the outgoing light side. It may be arranged, but it is preferable that it is arranged at least on the outgoing light side.
• Polyester used for the polyester film 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 has a large intrinsic birefringence. By stretching the film, the refractive index in the fast axis direction (perpendicular to the slow axis direction) can be kept low, and it is relatively easy even if the film is thin. Therefore, it is the most suitable material.
• the polyester film preferably 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 is measured in a direction perpendicular to the plane of the film, and can be measured using a spectrophotometer (for example, Hitachi U-3500 type).
• the ultraviolet absorber used in the present invention is a known substance.
• 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.
• 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 above range.
• benzotriazole type and cyclic imino ester type are particularly preferable.
• benzophenone ultraviolet absorbers examples include 2- [2′-hydroxy-5 ′-(methacryloyloxymethyl) phenyl] -2H-benzotriazole, 2- [2 ′.
• cyclic imino ester UV absorbers examples include 2,2 ′-(1,4 -Phenylene) bis (4H-3,1-benzoxazinon-4-one), 2-methyl-3,1-benzoxazin-4-one, 2-butyl-3,1-benzoxazin-4-one, Examples thereof include 2-phenyl-3,1-benzoxazin-4-one, but are not particularly limited thereto.
• 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, a content that is 50 ppm or less, preferably 10 ppm or less, particularly preferably the detection limit or less when inorganic elements are quantified by fluorescent X-ray analysis. means.
• the surface of the polyester film that is a polarizer protective film used in the present invention has various functional layers, that is, a hard coat layer, an antiglare layer, an antireflection layer, and the like for the purpose of preventing reflection, suppressing glare, and suppressing scratches. It is also a preferable aspect to provide.
• the polyester film preferably has an easy adhesion layer on the surface thereof. At that time, from the viewpoint of suppressing interference due to reflected light, 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 polyester film.
• the refractive index of the easy-adhesion layer can be adjusted by a known method. For example, 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 polyester film can be subjected to corona treatment, coating treatment, flame treatment, etc. in order to improve the adhesion with 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 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 at a magnification such that the size of one smallest particle is 2-5 mm, the maximum diameter of 300-500 particles (between the two most distant points) Distance) is measured, and the average value is taken as the average particle diameter.
• SEM scanning electron microscope
• the polyester film used as a polarizer protective film 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 polyester film used in 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. However, rainbow-like color spots are not seen, but care must be taken because rainbow-like color spots may be observed when observed from an oblique direction.
• the longitudinal stretching temperature and the transverse stretching temperature are preferably 80 to 135 ° C, more preferably 80 to 130 ° C, and 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 longitudinal draw ratio is preferably 2.5 to 6.0 times, particularly preferably 3.0 to 5.5 times.
• the transverse draw ratio is preferably 1.0 to 3.5 times, and particularly preferably 1.0 to 3.0 times.
• 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, if the longitudinal stretching ratio is lowered to increase the retardation, the longitudinal thickness unevenness may be deteriorated. Since there is a region where the vertical thickness unevenness becomes very bad in a specific range of the draw ratio, it is desirable to set the film forming conditions outside this range.
• the thickness unevenness of the polyester film is preferably 5.0% or less, more preferably 4.5% or less, still more preferably 4.0% or less, and 3.0% or less. Is particularly preferred.
• the stretching ratio, stretching temperature, and film thickness can be appropriately set.
• the higher the stretching ratio, the lower the stretching temperature, and the thicker the film the higher the retardation.
• the lower the stretching ratio, the higher the stretching temperature, and the thinner the film the lower the retardation.
• the thickness of the polyester film is arbitrary, but is preferably in the range of 15 to 300 ⁇ m, more preferably in the range of 15 to 200 ⁇ m. Even in the case of a film having a thickness of less than 15 ⁇ m, it is possible in principle to obtain a retardation of 1500 nm or more. 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. On the other hand, if 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.
• the polyester used as the film substrate is preferably polyethylene terephthalate.
• a method of blending the ultraviolet absorber into the polyester film a known method can be used in combination.
• a master batch is prepared by blending the dried ultraviolet absorber and the polymer raw material in advance using a kneading extruder. It can be prepared and blended by, for example, a method of mixing a predetermined master batch and a polymer raw material during film formation.
• 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 kneading extruder 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. If it exceeds 290 ° C., the weight loss of the UV absorber is large, and the viscosity of the master batch is greatly reduced. If the extrusion time is 1 minute or less, uniform mixing of the UV absorber becomes difficult. At this time, if necessary, a stabilizer, a color tone adjusting agent, and an antistatic agent may be added.
• the polyester 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 (the refractive index in the slow axis direction: Ny, the fast axis (the refractive index in the direction perpendicular to the slow axis direction): Nx), and the refractive index in the thickness direction ( Nz) was determined by an Abbe refractometer (manufactured by Atago Co., Ltd., NAR-4T, measurement wavelength 589 nm).
• 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.), determine the slow axis direction of the film, 4 cm so that the slow 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 of ⁇ 2 cm was cut out and used as a measurement sample.
• Abbe refracts the biaxial refractive index (the refractive index in the slow axis direction: Ny, the refractive index in the direction perpendicular to the slow axis direction: Nx), and the refractive index (Nz) in the thickness direction.
• ) of the biaxial refractive index difference was determined as a refractive index anisotropy ( ⁇ Nxy), which was obtained by a refractive index meter (NAGO-4T manufactured by Atago Co., Ltd., measurement wavelength 589 nm).
• 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 (
• This light source had a plurality of peaks in the wavelength region of 600 nm or more and 780 nm or less, and the half-value width was evaluated at a peak near 630 nm having the highest peak intensity in this region. Moreover, the exposure time in the spectrum measurement was 20 msec.
• 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.
• (Polarizer protective film 2) A film was formed in the same manner as the polarizer protective film 1 except that the thickness of the unstretched film was changed by changing the line speed, to obtain a uniaxially stretched PET film having a film thickness of about 80 ⁇ m.
• a liquid crystal display device was prepared using the polarizer protective films 1 to 8 as described later.
• Example 1 A polarizer protective film 1 is attached to one side of a polarizer composed of PVA and iodine so that the transmission axis of the polarizer and the phase advance axis of the film are parallel to each other, and a TAC film (FUJIFILM Corporation) on the opposite side. Manufactured, with a thickness of 80 ⁇ m) to make a polarizing plate 1.
• the polarizing plate on the viewing side of REGZA 43J10X manufactured by Toshiba Corporation was replaced with the polarizing plate 1 so that the polyester film was on the side opposite to the liquid crystal (distal), thereby producing a liquid crystal display device.
• Example 2 A polarizer protective film 2 is attached to one side of a polarizer made of PVA and iodine so that the transmission axis of the polarizer and the phase advance axis of the film are parallel to each other, and a TAC film (Fuji Film Co., Ltd.) on the opposite side. Manufactured, with a thickness of 80 ⁇ m) to make a polarizing plate 2.
• a liquid crystal display device was produced in the same manner as in Example 1 except that the polarizing plate 1 was changed to the polarizing plate 2.
• Example 3 A polarizer protective film 3 is attached to one side of a polarizer composed of PVA and iodine so that the transmission axis of the polarizer and the phase advance axis of the film are parallel to each other, and a TAC film (Fuji Film Co., Ltd.) on the opposite side. Manufactured, with a thickness of 80 ⁇ m), and polarizing plate 3 was prepared. A liquid crystal display device was produced in the same manner as in Example 1 except that the polarizing plate 1 was changed to the polarizing plate 3.
• Example 4 A polarizer protective film 3 is attached to one side of a polarizer composed of PVA and iodine so that the transmission axis of the polarizer and the phase advance axis of the film are parallel to each other, and a TAC film (Fuji Film Co., Ltd.) on the opposite side. Manufactured, with a thickness of 80 ⁇ m), and polarizing plate 3 was prepared.
• the polarizing plate on the light source side of REGZA 43J10X manufactured by Toshiba Corporation was replaced with the polarizing plate 3 so that the polyester film was on the side opposite to the liquid crystal (distal), thereby producing a liquid crystal display device.
• a polarizer protective film 3 is attached to one side of a polarizer composed of PVA and iodine so that the transmission axis of the polarizer and the phase advance axis of the film are parallel to each other, and a TAC film (Fuji Film Co., Ltd.) on the opposite side.
• TAC film Fluji Film Co., Ltd.
• polarizing plate 3 was prepared.
• a polarizing plate on the viewing side and the light source side of REGZA 43J10X manufactured by Toshiba Corporation was replaced with the polarizing plate 3 so that the polyester film was on the side opposite to the liquid crystal (distal), thereby producing a liquid crystal display device.
• Example 6 A polarizer protective film 4 is attached to one side of a polarizer composed of PVA and iodine so that the transmission axis of the polarizer and the phase advance axis of the film are parallel to each other, and a TAC film (FUJIFILM Corporation) Manufactured, with a thickness of 80 ⁇ m), and polarizing plate 4 was created.
• a liquid crystal display device was produced in the same manner as in Example 1 except that the polarizing plate 1 was changed to the polarizing plate 4.
• Example 7 A polarizer protective film 5 is attached to one side of a polarizer made of PVA and iodine so that the transmission axis of the polarizer and the fast axis of the film are parallel to each other, and a TAC film (Fuji Film Co., Ltd.) on the opposite side. Manufactured, with a thickness of 80 ⁇ m) to make a polarizing plate 5.
• a liquid crystal display device was produced in the same manner as in Example 1 except that the polarizing plate 1 was changed to the polarizing plate 5.
• Example 8 A polarizer protective film 6 is attached to one side of a polarizer made of PVA and iodine so that the transmission axis of the polarizer and the phase advance axis of the film are parallel to each other, and a TAC film (Fuji Film Co., Ltd.) on the opposite side. Manufactured, with a thickness of 80 ⁇ m) to make a polarizing plate 6.
• a liquid crystal display device was produced in the same manner as in Example 1 except that the polarizing plate 1 was changed to the polarizing plate 6.
• a polarizer protective film 1 is attached to one side of a polarizer composed of PVA and iodine so that the transmission axis of the polarizer and the fast axis of the film are perpendicular to each other, and a TAC film (Fuji Film Co., Ltd.) Manufactured, with a thickness of 80 ⁇ m), and a polarizing plate 7 was prepared.
• the polarizing plate on the viewing side of REGZA 43J10X manufactured by Toshiba Corporation was replaced with the polarizing plate 7 so that the polyester film was on the side opposite to the liquid crystal (distal), thereby producing a liquid crystal display device.
• a polarizer protective film 2 is attached to one side of a polarizer made of PVA and iodine so that the transmission axis of the polarizer and the fast axis of the film are perpendicular to each other, and a TAC film (Fuji Film Co., Ltd.) Manufactured, with a thickness of 80 ⁇ m), and polarizing plate 8 was created.
• a liquid crystal display device was produced in the same manner as in Comparative Example 1 except that the polarizing plate 7 was changed to the polarizing plate 8.
• a polarizer protective film 3 is attached to one side of a polarizer made of PVA and iodine so that the transmission axis of the polarizer and the fast axis of the film are perpendicular to each other, and a TAC film (Fuji Film Co., Ltd.) Manufactured, with a thickness of 80 ⁇ m) to make a polarizing plate 9.
• a liquid crystal display device was produced in the same manner as in Comparative Example 1 except that the polarizing plate 7 was changed to the polarizing plate 9.
• a polarizer protective film 3 is attached to one side of a polarizer made of PVA and iodine so that the transmission axis of the polarizer and the fast axis of the film are perpendicular to each other, and a TAC film (Fuji Film Co., Ltd.) Manufactured, with a thickness of 80 ⁇ m) to make a polarizing plate 9.
• the polarizing plate on the light source side of REGZA 43J10X manufactured by Toshiba Corporation was replaced with the polarizing plate 9 so that the polyester film was on the side opposite to the liquid crystal (distal), thereby producing a liquid crystal display device.
• a polarizer protective film 3 is attached to one side of a polarizer made of PVA and iodine so that the transmission axis of the polarizer and the fast axis of the film are perpendicular to each other, and a TAC film (Fuji Film Co., Ltd.) Manufactured, with a thickness of 80 ⁇ m) to make a polarizing plate 9.
• a polarizing plate on the viewing side and the light source side manufactured by REGZA 43J10X manufactured by Toshiba Corporation was replaced with the polarizing plate 9 so that the polyester film was on the side opposite to the liquid crystal (distal), thereby producing a liquid crystal display device.
• a polarizer protective film 4 is attached to one side of a polarizer made of PVA and iodine so that the transmission axis of the polarizer and the fast axis of the film are perpendicular to each other, and a TAC film (Fuji Film Co., Ltd.) Manufactured and having a thickness of 80 ⁇ m) to make a polarizing plate 10.
• a liquid crystal display device was produced in the same manner as in Comparative Example 1 except that the polarizing plate 7 was changed to the polarizing plate 10.
• a polarizer protective film 7 is attached to one side of a polarizer made of PVA and iodine so that the transmission axis of the polarizer and the phase advance axis of the film are parallel to each other, and a TAC film (Fuji Film Co., Ltd.) on the opposite side. Manufactured and having a thickness of 80 ⁇ m), a polarizing plate 11 was prepared. A liquid crystal display device was produced in the same manner as in Comparative Example 1 except that the polarizing plate 7 was changed to the polarizing plate 11.
• a polarizer protective film 8 is attached to one side of a polarizer made of PVA and iodine so that the transmission axis of the polarizer and the fast axis of the film are parallel to each other, and a TAC film (Fuji Film Co., Ltd.) on the opposite side.
• a polarizing plate 12 was prepared.
• a liquid crystal display device was produced in the same manner as in Comparative Example 1 except that the polarizing plate 7 was changed to the polarizing plate 12.
• Table 1 below shows the results of the measurement of rainbow spot observation for the liquid crystal display devices obtained in each example.
• the liquid crystal display device and polarizing plate of the present invention can ensure good visibility in which the occurrence of rainbow-like color spots is significantly suppressed at any viewing angle, and the industrial applicability is extremely high. .

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