WO2016140235A1 - 液晶表示装置 - Google Patents

液晶表示装置 Download PDF

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Publication number
WO2016140235A1
WO2016140235A1 PCT/JP2016/056336 JP2016056336W WO2016140235A1 WO 2016140235 A1 WO2016140235 A1 WO 2016140235A1 JP 2016056336 W JP2016056336 W JP 2016056336W WO 2016140235 A1 WO2016140235 A1 WO 2016140235A1
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film
less
liquid crystal
peak
crystal display
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PCT/JP2016/056336
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English (en)
French (fr)
Japanese (ja)
Inventor
村田　浩一
章太 早川
俊樹 井上
佐々木　靖
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東洋紡株式会社
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Application filed by 東洋紡株式会社 filed Critical 東洋紡株式会社
Priority to CN201680002001.7A priority Critical patent/CN106796371B/zh
Priority to JP2016515170A priority patent/JP6032385B1/ja
Priority to CN201810073029.0A priority patent/CN108169955B/zh
Priority to KR1020167031805A priority patent/KR101813438B1/ko
Publication of WO2016140235A1 publication Critical patent/WO2016140235A1/ja

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    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/13363—Birefringent elements, e.g. for optical compensation
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133528—Polarisers
    • G—PHYSICS
    • G02—OPTICS
    • 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
    • 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 the occurrence of rainbow-like color spots is suppressed.
  • 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).
  • White light-emitting diodes consisting of light-emitting elements that combine blue light-emitting diodes and yttrium / aluminum / garnet-based yellow phosphors (YAG-based yellow phosphors) have been widely used as backlight sources for liquid crystal display devices. It has been.
  • the emission spectrum of this white light source is widely used as a backlight light source because it has a broad spectrum in the visible light region and is excellent in luminous efficiency.
  • this white LED as a backlight light source, the color can be reproduced only about 20% of the spectrum recognizable by human eyes.
  • liquid crystal display device in which the emission spectrum of a white light source has a clear peak shape in each wavelength region of R (red), G (green), and B (blue).
  • a white light source using a quantum dot technology a phosphor-type white LED light source using a phosphor having a clear emission peak in the R (red) and G (green) regions by excitation light and a blue LED, 3 Liquid crystal display devices that support a wide color gamut using various types of light sources, such as wavelength-type white LED light sources and white LED light sources combined with red lasers, have been developed.
  • a liquid crystal display device using a white light source using quantum dot technology as a backlight light source it is said that it is possible to reproduce colors of 60% or more of the spectrum that can be recognized by human eyes.
  • Each of these white light sources has a narrow peak half-value width compared to a light source composed of a white light emitting diode using a conventional YAG yellow phosphor, and a polarizer having a retardation as a constituent member of a polarizing plate. It was newly found that when used as a protective film, rainbow spots may occur depending on the type of light source.
  • 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, At least one of the two polarizing plates is one in which an alignment film is laminated on at least one surface of a polarizer,
  • the backlight light source has a peak top of the emission spectrum in each wavelength region of 400 nm or more and less than 495 nm, 495 nm or more and less than 600 nm, and 600 nm or more and 780 nm or less,
  • the wavelength of the peak top of the peak existing in the wavelength region of 600 nm to 780 nm is Rx
  • the half width is Ry
  • the retardation of the alignment film is Re
  • a liquid crystal display device wherein Ry / [Rx / (Re / Rx)] is 0.55 or more.
  • Item 2. The liquid crystal display device according to Item 1, wherein the backlight source has a peak top of an emission spectrum in each wavelength region of 400 nm to less than 495 nm, 495 nm to less than 600 nm, and 600 nm to 700 nm.
  • Item 3. The peak top wavelength of the peak existing in the wavelength region of 400 nm or more and less than 495 nm is Bx, the full width at half maximum and By, When the peak top wavelength of the peak existing in the wavelength region of 495 nm or more and less than 600 nm is Gx, and the half width is Gy, By / [Bx / (Re / Bx)] is 0.55 or more, and Item 3.
  • the liquid crystal display device of the present invention has a wide color gamut and can ensure good visibility in which the occurrence of rainbow-like color spots is significantly suppressed at any viewing angle.
  • An example in the case where a plurality of peaks exist in a single wavelength region is shown.
  • An example in the case where a plurality of peaks exist in a single wavelength region is shown.
  • An example in the case where a plurality of peaks exist in a single wavelength region is shown.
  • 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 and a liquid crystal cell disposed between two polarizing plates. 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.
  • a brightness enhancement film may be provided between the light source side polarizing plate and the backlight light source. Examples of 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.
  • the polarizing plate has a configuration in which a polarizer protective film is bonded to at least one surface of a polarizer in which PVA or the like is dyed with iodine.
  • a polarizer protective film is bonded to at least one surface of a polarizer in which PVA or the like is dyed with iodine.
  • at least one of the polarizer protective films constituting the polarizing plate is used.
  • 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, 400 nm is used as the backlight light source of the liquid crystal display device.
  • a white light source having a peak top of the emission spectrum in each wavelength region of 495 nm or more, less than 495 nm, 495 nm or more and less than 600 nm, or 600 nm or more and 780 nm or less is preferable.
  • the light source preferably has a peak top of the emission spectrum in each wavelength region of 400 nm to less than 495 nm, 495 nm to less than 600 nm, and 600 nm to 700 nm.
  • the peak wavelengths of blue, green, and red defined in the CIE chromaticity diagram are 435.8 nm (blue), 546.1 nm (green), and 700 nm (red), respectively.
  • the wavelength regions of 400 nm to less than 495 nm, 495 nm to less than 600 nm, and 600 nm to 780 nm correspond to a blue region, a green region, and a red region, respectively.
  • Examples of the light source as described above include a white light source using quantum dot technology, and a phosphor system using a phosphor and a blue LED each having an emission peak in the R (red) and G (green) regions by excitation light.
  • White LED light source three-wavelength white LED light source, white LED light source combining a red laser, and the like, but the type of the light source is not particularly limited in the present invention. As described above, any white light source having a peak top of the emission spectrum in each wavelength region of 400 nm to less than 495 nm, 495 nm to less than 600 nm, and 600 nm to 780 nm may be used.
  • the red phosphor for example, a nitride-based phosphor having a basic composition of CaAlSiN 3 : Eu or the like, a sulfide-based phosphor having a basic composition of CaS: Eu or the like, or Ca 2 SiO 4 : Eu
  • examples thereof include silicate-based phosphors having a basic composition and the like.
  • 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 half width of each peak there is a preferable upper limit and lower limit for the half width of each peak. If the half width is less than the preferred lower limit, rainbow-like color spots are likely to occur, and it is necessary to increase the thickness of the alignment film in order to increase the retardation (Re) of the alignment film, making it difficult to reduce the thickness of the display device. This is not preferable. If the half width exceeds the preferable upper limit, it is difficult to obtain the color gamut expansion effect. The narrower the half width of the peak in each wavelength range, the wider the color gamut. However, the narrower the half width of the peak, the lower the luminous efficiency, so the required color gamut and luminous efficiency balance, and the retardation of the alignment film used.
  • the shape of the emission spectrum may be designed from (Re).
  • the half width is the peak width (nm) at half the intensity of the peak intensity at the peak top wavelength.
  • the wavelength region of 495 nm to less than 600 nm, or the wavelength region of 600 nm to 780 nm consider as follows.
  • a plurality of peaks are independent peaks, it is preferable that the full width at half maximum of the peak having the highest peak intensity is in a range described later. Furthermore, it is more preferable that the half-value width of the other peak having an intensity of 70% or more of the highest peak intensity is in the range described later.
  • 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. In such a peak having a shape in which a plurality of peaks are overlapped, the peak width (nm) at half the intensity of the highest peak intensity is set as the half width. Of the plurality of peaks, the point with the highest peak intensity is defined as the peak top. The full width at half maximum when a plurality of peaks exist in a single wavelength region is indicated by double-pointing arrows in FIGS.
  • peaks A and B have a point at which the peak intensity is 1 ⁇ 2 of the peak intensity on the short wavelength side and the long wavelength side, respectively. Therefore, the peaks A and B are independent peaks.
  • the half-value width may be evaluated by the width of the double-pointing arrow of the peak A having the highest peak intensity.
  • the peak A and the peak B are collectively regarded as one independent peak.
  • the half-width of the peak having the highest peak intensity among the plurality of peaks can be measured as it is, the half-width is determined as the independent peak.
  • the full width at half maximum. Therefore, in the case of FIG. 3, the half width of the peak is the width of the double-pointing arrow.
  • the peak A does not have a point that is 1/2 of the peak intensity on the short wavelength side
  • the peak B does not have a point that becomes 1/2 of the peak intensity on the long wavelength side. Therefore, in FIG. 4, similarly to the case of FIG. 3, the peak A and the peak B are collectively regarded as one independent peak, and the half-value width is the width indicated by the bidirectional arrow.
  • the peak A and the peak B are collectively regarded as one independent peak.
  • the half width of the peak having the highest peak intensity among the plurality of peaks can be used as it is. Therefore, in the case of FIG. 5, the half-value width is a width indicated by a bidirectional arrow.
  • FIGS. 2 to 5 show wavelength regions of 400 nm or more and less than 495 nm as an example, but the same idea is applied to other wavelength regions.
  • the peak having the highest peak intensity in each of the wavelength range of 400 nm to less than 495 nm, the wavelength range of 495 nm to less than 600 nm, and the wavelength range of 600 nm to 780 nm is independent of the peaks in the other wavelength ranges. It is preferable that it exists in.
  • 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 or less 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.
  • / Rx)] is preferably 0.55 or more.
  • Ry / [Rx / (Re / Rx)] is 0.55 or more, the occurrence of rainbow spots can be suppressed when the liquid crystal display device is observed from the front and oblique directions.
  • Ry / [Rx / (Re / Rx)] is more preferably 0.60 or more, further preferably 0.65 or more, still more preferably 0.7 or more, particularly preferably 0.75 or more, and most preferably 0.
  • This value is preferably as high as possible, but is preferably 10 or less, more preferably 7 or less, even more preferably 5 or less, and most preferably 3 from the viewpoint of thinning the alignment film and widening the color gamut of the liquid crystal display device. It is as follows.
  • the retardation which an oriented film has here is a value in wavelength 589nm.
  • the light transmittance is a function expressed by the square of sin as shown in the above equation (1), and as shown in FIG.
  • Rx / (Re / Rx) corresponds to the repetition interval (nm) of the transmission intensity at the wavelength Rx. Therefore, Ry / [Rx / (Re / Rx)] is an index indicating how many transmission intensity repetitions exist in the half-value width Ry. As the transmission intensity repeats more frequently during the half-value width Ry, rainbow spots observed on the display screen can be suppressed.
  • Rx is preferably 600 nm or more and 780 nm or less.
  • Rx is preferably 630 nm or more, more preferably 635 nm or more, even more preferably 640 nm or more, and particularly preferably 645 nm or more.
  • the upper limit is preferably 780 nm or less, more preferably 700 nm or less, and further preferably 680 nm or less. It is preferable that Rx is 630 nm or more because red can be displayed more clearly and a wide color gamut can be secured. If it is 780 nm or less, it is preferable because a large amount of light in an easily visible region can be output.
  • the full width at half maximum Ry is preferably 180 nm or less, more preferably 150 nm or less, still more preferably 120 nm or less, and particularly preferably 100 nm or less. If the half-value width is large, the light component in the orange region increases and it becomes difficult to display pure red. Therefore, the Ry value is preferably 180 nm or less.
  • the lower limit of Ry is preferably 8 nm or more, more preferably 15 nm or more, still more preferably 20 nm or more, and particularly preferably 25 nm or more.
  • the peak peak wavelength of the peak existing in the wavelength region of 400 nm or more and less than 495 nm is Bx
  • the half width is By, the peak peak wavelength of the peak existing in the wavelength region of 495 nm or more and less than 600 nm is Gx
  • the half width is Gy. It is preferable that By / [Bx / (Re / Bx)] is 0.55 or more and / or Gy / [Gx / (Re / Gx)] is 0.55 or more. More preferably, By / [Bx / (Re / Bx)] is 0.55 or more, and Gy / [Gx / (Re / Gx)] is 0.55 or more.
  • it is more preferably 0.60 or more, further preferably 0.65 or more, still more preferably 0.7 or more, particularly preferably 0.75 or more, and most preferably 0.8 or more. If it is 0.55 or more, the generation of rainbow spots can be further suppressed, which is preferable.
  • These values are preferably as high as possible, but are preferably 10 or less, more preferably 7 or less, even more preferably 5 or less, and particularly preferably from the viewpoint of thinning the alignment film and widening the color gamut of the liquid crystal display device. 3 or less.
  • Bx / (Re / Bx) corresponds to the repetition interval (nm) of the transmission intensity at the wavelength Bx
  • By / [Bx / (Re / Bx)] is an index indicating how many transmission intensity repetitions exist between the half-value widths By.
  • Gx / (Re / Gx) corresponds to the repetition interval (nm) of the transmission intensity at the wavelength Gx
  • Gy / [Gx / (Re / Gx)] is between the half-value widths Gy. This is an index indicating how many repetitions of transmission intensity exist. As the transmission intensity repeats between the half-value widths By and Gy, the rainbow spots observed on the display screen can be further suppressed.
  • Bx is preferably 400 nm or more and less than 495 nm, and Gx is preferably 495 nm or more and less than 600 nm.
  • the full width at half maximum is preferably 100 nm or less, more preferably 70 nm or less, still more preferably 60 nm or less, and particularly preferably 50 nm or less.
  • the lower limit of the full width at half maximum is preferably 5 nm or more, more preferably 8 nm or more, still more preferably 10 nm or more, and particularly preferably 12 nm or more. If it is less than 5 nm, rainbow-like color spots are likely to occur, which is not preferable.
  • the full width at half maximum Gy is preferably 150 nm or less, more preferably 120 nm or less, still more preferably 100 nm or less, and particularly preferably 90 nm or less.
  • the lower limit of the full width at half maximum Gy is preferably 7 nm or more, more preferably 10 nm or more, still more preferably 12 nm or more, and particularly preferably 15 nm or more. If it is less than 5 nm, rainbow-like color spots are likely to occur, which is not preferable.
  • Bx is preferably not less than 430 nm and not more than 470 nm.
  • Gx is preferably 510 nm or more and 560 nm or less.
  • the transmission intensity is repeated up and down.
  • the repetition interval tends to be longer in the long wavelength region than in the short wavelength region, the half-value widths By, Gy, and Ry of each peak are narrow from the viewpoint of securing a wide color gamut.
  • Ry / [Rx / (Re / Rx)] satisfy the requirement of 0.55 or more, such as By / [Bx / (Re / Bx)] and Gy.
  • / [Gx / (Re / Gx)] tends to be more severe than satisfying the condition.
  • the oriented film used for the polarizer protective film is not particularly limited as long as it satisfies the requirement that Ry / [Rx / (Re / Rx)] is 0.55 or more, but may have a retardation of 3000 to 30000 nm. preferable.
  • 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, and the still more preferred lower limit is 10,000 nm.
  • the retardation 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).
  • the retardation is a value at a wavelength of 589 nm.
  • Alignment films used as polarizer protective films include polyester resin, polycarbonate resin, polystyrene resin, syndiotactic polystyrene resin, polyetheretherketone resin, polyphenylene sulfide resin, cycloolefin resin, liquid crystalline polymer resin, and cellulosic resin. It can manufacture using 1 or more types selected from the group which consists of resin which added the compound.
  • the alignment film is a polyester film, polycarbonate film, polystyrene film, syndiotactic polystyrene film, polyetheretherketone film, polyphenylene sulfide film, cycloolefin film, liquid crystalline polymer film, and a liquid crystal compound added to a cellulose resin. It can be a film.
  • the preferred raw material resin for the oriented film is polycarbonate, polyester or syndiotactic polystyrene. These resins are excellent in transparency and excellent in thermal and mechanical properties, and the retardation can be easily controlled by stretching. Polyesters typified by polyethylene terephthalate and polyethylene naphthalate are preferable because they have a large intrinsic birefringence and can relatively easily obtain a large retardation even when the film thickness is thin. Polyethylene terephthalate and polyethylene naphthalate may contain other copolymer components, or may be a blend of other polyester resins such as polybutylene terephthalate. In particular, polyethylene terephthalate is preferable because it has a large intrinsic birefringence among polyesters and can reduce the thickness of the film while maintaining high retardation.
  • 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 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 oriented film to the thickness direction retardation (Re / Rth) is preferably 0.200 or more, more preferably 0.500 or more, and further preferably 0.600 or more. As the ratio of the retardation to the retardation in the thickness direction (Re / Rth) is larger, the occurrence of rainbow-like color spots due to the observation angle is less likely to occur. In a complete uniaxial (uniaxial symmetry) film, the ratio of the retardation to the retardation in the thickness direction (Re / Rth) is 2.0. However, it is necessary to pay attention because the mechanical strength in the direction orthogonal to the orientation direction may significantly decrease as the film approaches a complete uniaxial (uniaxial symmetry) film.
  • the ratio of the retardation of the polyester film to the retardation in the thickness direction (Re / Rth) is preferably 2.0 or less, more preferably 1.2 or less, and still more preferably 1.0 or less.
  • the polarizer protective films is an oriented film.
  • the arrangement of the alignment film is not particularly limited, but a liquid crystal display in which a polarizing plate arranged on the incident light side (light source side), a liquid crystal cell, and a polarizing plate arranged on the outgoing light side (viewing side) are arranged.
  • the polarizer protective film on the incident light side of the polarizing plate arranged on the incident light side and / or the polarizer protective film on the outgoing light side of the polarizing plate arranged on the outgoing light side are alignment films. Is preferred.
  • the alignment film is disposed at a position other than the above, the polarization characteristics of the liquid crystal cell may be changed. Since it is not preferable to use the polymer film of the present invention at a place where polarization characteristics are required, it is preferably used as a protective film for a polarizing plate at such a specific position.
  • the absorption axis direction of the polarizer and the slow axis direction of the oriented film are preferably substantially parallel or substantially perpendicular.
  • the absorption axis direction of the polarizer and the slow axis direction of the alignment film may be either substantially parallel or substantially vertical, but it is easier to suppress rainbow spots if they are arranged substantially in parallel. From the viewpoint of ease of industrial production, a substantially perpendicular relationship between the absorption axis direction of the polarizer and the slow axis direction of the oriented film is preferable.
  • substantially parallel means that the absorption axis and the slow axis are arranged in parallel, preferably ⁇ 15 ° or less, more preferably ⁇ 10 ° or less, further preferably ⁇ 5 ° or less, and still more preferably ⁇ It means to allow a deviation of 3 ° or less, more preferably ⁇ 2 ° or less, particularly preferably ⁇ 1 ° or less.
  • substantially parallel is substantially parallel.
  • the phrase “substantially parallel” means that the absorption axis and the slow axis are parallel to such an extent that the inevitable deviation is allowed.
  • substantially perpendicular means that the absorption axis and the slow axis are perpendicular to each other, preferably ⁇ 15 ° or less, more preferably ⁇ 10 ° or less, further preferably ⁇ 5 ° or less, and even more preferably ⁇ It means to allow a deviation of 3 ° or less, more preferably ⁇ 2 ° or less, particularly preferably ⁇ 1 ° or less.
  • substantially vertical is substantially vertical.
  • substantially perpendicular means that the absorption axis and the slow axis are perpendicular to the extent that an inevitable shift 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 viewing side polarizing plate is usually arranged so that the absorption axis direction of the viewing side polarizing plate is parallel to the horizontal direction of the screen, and the light source side polarizing plate is a light source side polarizing plate. It arrange
  • the type of the protective film on the light source side of the viewing side polarizer and the protective film on the viewing side of the light source side polarizer is arbitrary, and a film conventionally used as a protective film can be appropriately selected and used. From the viewpoint of easy handling and availability, for example, triacetyl cellulose (TAC) film, acrylic film, cyclic olefin resin film (norbornene film), polypropylene film, polyolefin resin film (for example, TPX), etc. It is preferable to use one or more films selected from the group consisting of:
  • the light source side protective film of the viewer side polarizer and the viewer side protective film of the light source side polarizer are preferably optical compensation films having an optical compensation function.
  • Such an optical compensation film can be appropriately selected according to each type of liquid crystal.
  • a liquid crystal compound for example, a discotic liquid crystal compound and / or a birefringent compound
  • triacetyl cellulose. 1 selected from the group consisting of resin, cyclic olefin resin (for example, norbornene resin), propionyl acetate resin, polycarbonate film resin, acrylic resin, styrene acrylonitrile copolymer resin, lactone ring-containing resin, and imide group-containing polyolefin resin. What can be obtained from more than a seed can be mentioned.
  • optical compensation films are commercially available, they can be appropriately selected and used.
  • “Wideview-EA” and “Wideview-T” manufactured by FUJIFILM Corporation) for the TN system
  • “Wideview-B” manufactured by FUJIFILM Corporation
  • VA-TAC Konica Minolta, Inc.
  • “ZEONOR FILM” manufactured by ZEON Corporation
  • “ARTON” manufactured by JSR Corporation
  • “X-plate” manufactured by Nitto Denko Corporation
  • Z-TAC Z-TAC
  • “FUJIFILM Corporation) for IPS system a commercially available, they can be appropriately selected and used.
  • CGI manufactured by Nitto Denko Corporation
  • P-TAC manufactured by Okura Kogyo Co., Ltd.
  • the polarizing plate of the present invention has a structure in which a polarizer protective film is attached to at least one surface of a polarizer in which polyvinyl alcohol (PVA) or the like is dyed with iodine, and any one of the polarizer protective films is oriented.
  • a film is preferred.
  • the polarizing plate used in the present invention it is also preferable to apply various hard coats on the surface for the purpose of preventing reflection, suppressing glare, and suppressing scratches.
  • a hard coat layer, an antireflection layer, a low reflection layer, an antiglare layer, or a functional layer combining these may be provided.
  • the alignment film 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 by a method 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 range defined by the present invention.
  • benzotoazole and cyclic imino ester are particularly preferable.
  • benzophenone ultraviolet absorbers examples include 2- [2'-hydroxy-5 '-(methacryloyloxymethyl) phenyl] -2H-benzotriazole, 2- [2' -Hydroxy-5 '-(methacryloyloxyethyl) phenyl] -2H-benzotriazole, 2- [2'-hydroxy-5'-(methacryloyloxypropyl) phenyl] -2H-benzotriazole, 2,2'-dihydroxy- 4,4′-dimethoxybenzophenone, 2,2 ′, 4,4′-tetrahydroxybenzophenone, 2,4-di-tert-butyl-6- (5-chlorobenzotriazol-2-yl) phenol, 2- ( 2'-hydroxy-3'-tert-butyl-5 -Methylphenyl) -5-chlorobenzotriazole, 2- (5-
  • cyclic imino ester UV absorbers examples include 2,2 ′-(1 , 4-phenylene) bis (4H-3,1-benzoxazin-4-one), 2-methyl-3,1-benzoxazin-4-one, 2-butyl-3,1-benzoxazin-4-one , 2-phenyl-3,1-benzoxazin-4-one, etc., but is 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.
  • the oriented film contains substantially no particles.
  • “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.
  • orientation film can be subjected to corona treatment, coating treatment, flame treatment, etc. in order to improve the adhesion to the polarizer.
  • an easy-adhesion layer mainly composed of at least one of a polyester resin, a polyurethane resin or a polyacrylic resin on at least one surface of the alignment film.
  • 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 the 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.
  • grain is performed with 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 can be manufactured according to a general method for manufacturing a polyester film.
  • 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 may be a uniaxially stretched film or a biaxially stretched film. Although no color spots are observed, it is preferable to be careful 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 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 have a great influence on the thickness unevenness of the film, it is preferable to optimize the film forming conditions from the viewpoint of the thickness unevenness. 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 oriented 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 oriented film is arbitrary, but 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. 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. From the viewpoint of practicality as a polarizer protective film, 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.
  • 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 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. When the extrusion temperature 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 oriented film has a multilayer structure of at least three layers, and an ultraviolet absorber is added to the intermediate layer of the film.
  • a polyester film having a three-layer structure containing an ultraviolet absorber in the intermediate layer can be 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.), 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.
  • ) was determined as a refractive index anisotropy ( ⁇ Nxy).
  • 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).
  • 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-benzoxazin-4-one), PET (A) containing no particles (with intrinsic viscosity 0.62 dl / g) 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 dried UV absorber (2,2 ′-(1,4-phenylene) bis (4H-3,1-benzoxazin-4-one)
  • 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. Re of the obtained film was 8080 nm.
  • (Polarizer protective film 3) 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 60 ⁇ m. Re of the obtained film was 6060 nm.
  • (Polarizer protective film 4) A film was formed in the same manner as the polarizer protective film 1 except that the line speed was changed and the thickness of the unstretched film was changed to obtain a uniaxially stretched PET film having a film thickness of about 40 ⁇ m. Re of the obtained film was 4160 nm.
  • a liquid crystal display device was prepared using the polarizer protective films 1 to 6 as described later.
  • a polarizer protective film 1 is attached to one side of a polarizer made of PVA and iodine so that the absorption axis of the polarizer and the slow axis of the film are perpendicular to each other, and a TAC film (Fuji Film Co., Ltd.) is placed on the opposite side. Manufactured, with a thickness of 80 ⁇ m) to make a polarizing plate 1.
  • the polarizing plate on the viewing side and the light source side of BRAVIA KDL-40W920A manufactured by Sony 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 absorption axis of the polarizer and the slow axis of the film are perpendicular to each other, and a TAC film (Fuji Film Co., Ltd.) is placed on the opposite side. Manufactured, with a thickness of 80 ⁇ m) to make a polarizing plate 2.
  • a polarizing plate on the viewing side and the light source side of BRAVIA KDL-40W920A manufactured by Sony was replaced with the polarizing plate 2 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 absorption axis of the polarizer and the slow axis of the film are perpendicular to each other, and a TAC film (Fuji Film Co., Ltd.) is placed 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 BRAVIA KDL-40W920A manufactured by Sony 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 4 is attached to one side of a polarizer made of PVA and iodine so that the absorption axis of the polarizer and the slow axis of the film are perpendicular 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 4 was created. A polarizing plate on the viewing side and the light source side of BRAVIA KDL-40W920A manufactured by Sony was replaced with the polarizing plate 4 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 5 is attached to one side of a polarizer made of PVA and iodine so that the absorption axis of the polarizer and the slow axis of the film are perpendicular to each other, and a TAC film (Fuji Film Co., Ltd.) is placed on the opposite side. Manufactured, with a thickness of 80 ⁇ m) to make a polarizing plate 5.
  • a polarizing plate on the viewing side and the light source side of BRAVIA KDL-40W920A manufactured by Sony was replaced with the polarizing plate 5 so that the polyester film was on the side opposite to the liquid crystal (distal), thereby producing a liquid crystal display device.
  • Example 3 A polarizer protective film 6 is attached to one side of a polarizer made of PVA and iodine so that the absorption axis of the polarizer and the slow axis of the film are perpendicular to each other, and a TAC film (Fuji Film Co., Ltd.) is placed on the opposite side. Manufactured, with a thickness of 80 ⁇ m) to make a polarizing plate 6. A polarizing plate on the viewing side and the light source side of BRAVIA KDL-40W920A manufactured by Sony was replaced with the polarizing plate 6 so that the polyester film was on the side opposite to the liquid crystal (distal), thereby producing a liquid crystal display device.
  • Example 4 A polarizer protective film 1 is attached to one side of a polarizer made of PVA and iodine so that the absorption axis of the polarizer and the slow axis of the film are perpendicular to each other, and a TAC film (Fuji Film Co., Ltd.) is placed on the opposite side. Manufactured, with a thickness of 80 ⁇ m) to make a polarizing plate 1. The polarizing plate on the viewing side and the light source side of BRAVIA KDL-42W900B manufactured by Sony 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.
  • a polarizer protective film 2 is attached to one side of a polarizer made of PVA and iodine so that the absorption axis of the polarizer and the slow axis of the film are perpendicular to each other, and a TAC film (Fuji Film Co., Ltd.) is placed on the opposite side.
  • TAC film Fluji Film Co., Ltd.
  • the polarizing plate on the viewing side and the light source side of BRAVIA KDL-42W900B manufactured by Sony was replaced with the polarizing plate 2 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 absorption axis of the polarizer and the slow axis of the film are perpendicular to each other, and a TAC film (Fuji Film Co., Ltd.) is placed on the opposite side.
  • TAC film Fluji Film Co., Ltd.
  • polarizing plate 3 was prepared.
  • the polarizing plate on the viewing side and the light source side of BRAVIA KDL-42W900B manufactured by Sony 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 7 A polarizer protective film 4 is attached to one side of a polarizer made of PVA and iodine so that the absorption axis of the polarizer and the slow axis of the film are perpendicular 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 4 was created. The polarizing plate on the viewing side and the light source side of BRAVIA KDL-42W900B manufactured by Sony was replaced with the polarizing plate 4 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 5 is attached to one side of a polarizer made of PVA and iodine so that the absorption axis of the polarizer and the slow axis of the film are perpendicular to each other, and a TAC film (Fuji Film Co., Ltd.) is placed on the opposite side. Manufactured, with a thickness of 80 ⁇ m) to make a polarizing plate 5.
  • a polarizing plate on the viewing side and the light source side of BRAVIA KDL-42W900B manufactured by Sony was replaced with the polarizing plate 5 so that the polyester film was on the side opposite to the liquid crystal (distal), thereby producing a liquid crystal display device.
  • Example 8 A polarizer protective film 6 is attached to one side of a polarizer made of PVA and iodine so that the absorption axis of the polarizer and the slow axis of the film are perpendicular to each other, and a TAC film (Fuji Film Co., Ltd.) is placed on the opposite side. Manufactured, with a thickness of 80 ⁇ m) to make a polarizing plate 6. A polarizing plate on the viewer side and the light source side of BRAVIA KDL-42W900B manufactured by Sony was replaced with the polarizing plate 6 so that the polyester film was on the side opposite to the liquid crystal (distal side), thereby producing a liquid crystal display device.
  • Example 9 A polarizer protective film 1 is attached to one side of a polarizer made of PVA and iodine so that the absorption axis of the polarizer and the slow axis of the film are perpendicular to each other, and a TAC film (Fuji Film Co., Ltd.) is placed on the opposite side. Manufactured, with a thickness of 80 ⁇ m) to make a polarizing plate 1. The polarizing plate on the viewing side and the light source side of BRAVIA KDL-55W900A manufactured by Sony 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.
  • a TAC film Fluji Film Co., Ltd.
  • a polarizer protective film 2 is attached to one side of a polarizer made of PVA and iodine so that the absorption axis of the polarizer and the slow axis of the film are perpendicular to each other, and a TAC film (Fuji Film Co., Ltd.) is placed on the opposite side. Manufactured, with a thickness of 80 ⁇ m) to make a polarizing plate 2.
  • the polarizing plate on the viewing side and the light source side of BRAVIA KDL-55W900A manufactured by Sony was replaced with the polarizing plate 2 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 absorption axis of the polarizer and the slow axis of the film are perpendicular to each other, and a TAC film (Fuji Film Co., Ltd.) is placed on the opposite side.
  • TAC film Fluji Film Co., Ltd.
  • polarizing plate 3 was prepared.
  • the polarizing plate on the viewing side and the light source side of BRAVIA KDL-55W900A manufactured by Sony 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 4 is attached to one side of a polarizer made of PVA and iodine so that the absorption axis of the polarizer and the slow axis of the film are perpendicular 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 4 was created. The polarizing plate on the viewing side and the light source side of BRAVIA KDL-55W900A manufactured by Sony was replaced with the polarizing plate 4 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 5 is attached to one side of a polarizer made of PVA and iodine so that the absorption axis of the polarizer and the slow axis of the film are perpendicular to each other, and a TAC film (Fuji Film Co., Ltd.) is placed on the opposite side. Manufactured, with a thickness of 80 ⁇ m) to make a polarizing plate 5.
  • the polarizing plate on the viewing side and the light source side of BRAVIA KDL-55W900A manufactured by Sony was replaced with the polarizing plate 5 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 6 is attached to one side of a polarizer made of PVA and iodine so that the absorption axis of the polarizer and the slow axis of the film are perpendicular to each other, and a TAC film (Fuji Film Co., Ltd.) is placed on the opposite side. Manufactured, with a thickness of 80 ⁇ m) to make a polarizing plate 6.
  • the polarizing plate on the viewing side and the light source side of BRAVIA KDL-55W900A manufactured by Sony was replaced with the polarizing plate 6 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 absorption axis of the polarizer and the slow axis of the film are parallel to each other, and a TAC film (Fuji Film Co., Ltd.) on the opposite side.
  • a polarizing plate 2A was prepared, and a liquid crystal display device was prepared in the same manner as in Example 2 except that the polarizing plate 2A was used instead of the polarizing plate 2.
  • Example 12 A polarizer protective film 1 is attached to one side of a polarizer made of PVA and iodine so that the absorption axis of the polarizer and the slow axis of the film are parallel to each other, and a TAC film (Fuji Film Co., Ltd.) on the opposite side.
  • a polarizing plate 1A was prepared, and a liquid crystal display device was prepared in the same manner as in Example 1 except that the polarizing plate 1A was used instead of the polarizing plate 1.
  • 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 of the present invention has a wide color gamut and can ensure good visibility in which the occurrence of rainbow-like color spots is significantly suppressed at any viewing angle.
  • the nature is extremely high.

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Polarising Elements (AREA)
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JP2017173854A (ja) * 2016-01-08 2017-09-28 大日本印刷株式会社 表示装置、及び表示装置の色の再現性の改善方法
JP2018194741A (ja) * 2017-05-19 2018-12-06 大日本印刷株式会社 配向フィルム、並びに、それを用いた透明導電性フィルム、タッチパネル及び表示装置
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KR101813438B1 (ko) 2018-01-30
TW201636704A (zh) 2016-10-16
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