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WO2015022878A1 - Dispositif d'affichage à cristaux liquides, film de déphasage, et plaque de polarisation - Google Patents

Dispositif d'affichage à cristaux liquides, film de déphasage, et plaque de polarisation Download PDF

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Publication number
WO2015022878A1
WO2015022878A1 PCT/JP2014/070587 JP2014070587W WO2015022878A1 WO 2015022878 A1 WO2015022878 A1 WO 2015022878A1 JP 2014070587 W JP2014070587 W JP 2014070587W WO 2015022878 A1 WO2015022878 A1 WO 2015022878A1
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Prior art keywords
retardation film
liquid crystal
absorbance
wavelength
formula
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English (en)
Japanese (ja)
Inventor
齊藤　之人
大室　克文
亮子 渡野
市橋　光芳
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Fujifilm Corp
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Fujifilm Corp
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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G02B5/3083—Birefringent or phase retarding elements
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—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
    • G02F1/13363—Birefringent elements, e.g. for optical compensation

Definitions

  • the present invention relates to a liquid crystal display device, a retardation film, and a polarizing plate. More specifically, the present invention relates to a liquid crystal display device in which front luminance and black color shift when viewed obliquely are improved, a retardation film that can be used in the liquid crystal display device, and a polarizing plate having the retardation film.
  • LCDs liquid crystal display devices
  • the liquid crystal display device has a configuration in which, for example, a backlight (hereinafter also referred to as BL), a backlight side polarizing plate, a liquid crystal cell, a viewing side polarizing plate, and the like are provided in this order.
  • BL backlight
  • a backlight side polarizing plate a backlight side polarizing plate
  • LCD performance improvement especially in small size such as tablet PCs and smartphones.
  • Patent Document 1 realizes high brightness and improved color reproducibility by embodying white light using a quantum dot (QD) that emits red light and green light as a phosphor between a blue LED and a light guide plate. How to do is described.
  • QD quantum dot
  • the quantum dot (Quantum Dot, hereinafter also referred to as QD) is used to realize high luminance and color reproducibility improvement by white light. Further improvement in luminance was required.
  • QD quantum dot
  • the present inventors examined a liquid crystal display device using the method described in Patent Document 1 the amount of black color shift (black shift) was increased because the color reproduction range was expanded from 72% to 100% of the NTSC ratio. As a result, it has been found that there is a new problem that the color unevenness becomes conspicuous and the black shift is more demanded than ever before.
  • Patent Document 2 discloses a J aggregate in which a plurality of dye molecules are assembled. A birefringent film is described.
  • the dye used in Patent Document 3 is usually used as an optical filter that adjusts the transmittance of light having a specific wavelength, as described in Patent Document 4, for example.
  • the trade-off is high brightness by improving the BL light utilization rate necessary for power saving, high definition (opening ratio reduction), and color reproducibility improvement (color filter (hereinafter also referred to as CF) transmittance reduction).
  • the relationship is to achieve both improvement in light utilization and color reproducibility, in particular, improvement in front luminance and improvement in black color shift when viewed obliquely.
  • the problem to be solved by the present invention is to provide a liquid crystal display device in which the front luminance and the black color shift when viewed obliquely are improved.
  • abnormalities such as dyes exhibiting absorption anisotropy corresponding to the wavelength of the valley of the emission wavelength not used in the light source 3 wavelength and exhibiting anisotropy in absorbance Refraction due to dispersion (anomalous dispersion means that the refractive index of a dye exhibiting such anisotropy of absorbance changes within a range of several tens of nm in the vicinity of the wavelength indicating the maximum absorbance)
  • a retardation film, a liquid crystal cell, and a backlight unit has a maximum absorbance at 595 ⁇ 10 nm or 655 ⁇ 10 nm, and satisfies the following formulas (1) and (2); Blue light having a light emission center wavelength in a wavelength band of 430 to 480 nm by the backlight unit; Green light having an emission center wavelength in a wavelength band of 500 to 600 nm, Emitting red light having an emission center wavelength in a wavelength band of 600 to 650 nm; Liquid crystal display device.
  • Formula (1) 2 ⁇ ⁇ / ⁇ ⁇ 6 (In the formula (1), ⁇ represents the maximum value of the absorbance of the retardation film, and ⁇ ⁇ represents the absorbance with respect to the wavelength at which the absorbance in the direction orthogonal to the direction in which the absorbance of the retardation film is maximized).
  • Re ( ⁇ ) represents retardation in the in-plane direction of the retardation film (unit: nm) at the wavelength ⁇ nm.)
  • Re ( ⁇ ) represents retardation in the in-plane direction of the retardation film (unit: nm) at the wavelength ⁇ nm.)
  • the half width of the blue light, the half width of the green light, and the half width of the red light are all 100 nm or less.
  • the half width of the absorbance peak of the retardation film is preferably 10 to 50 nm.
  • the retardation film preferably satisfies the following formula (3).
  • Formula (3) 0.90 ⁇ ⁇ Re (535) / Re (450) ⁇ / ⁇ Re (630) / Re (535) ⁇ ⁇ 1.1
  • Re ( ⁇ ) represents retardation (unit: nm) in the in-plane direction of the retardation film at the wavelength ⁇ nm.)
  • the direction in which the absorbance of the retardation film has a maximum value is parallel to the slow axis of the retardation film. .
  • the retardation film preferably includes an absorbing material having a maximum absorbance at 595 ⁇ 10 nm or 655 ⁇ 10 nm.
  • the retardation film is preferably a laminate of a base material and an absorbent layer containing an absorbent material, or a single layer of a base material containing an absorbent material.
  • the liquid crystal display device according to any one of [1] to [7] includes at least one of the liquid crystal cell and the backlight unit, and the liquid crystal cell on the opposite side of the backlight unit.
  • the direction in which the absorbance of the retardation film is maximum is preferably parallel to the absorption axis of the polarizer.
  • the liquid crystal display device has a viewing side polarizer on a side opposite to the backlight unit with respect to the liquid crystal cell. Having at least one retardation film between the liquid crystal cells, It is preferable that a backlight side polarizer is provided between the liquid crystal cell and the backlight unit, and at least one retardation film is provided between the backlight side polarizer and the liquid crystal cell.
  • the backlight unit includes the blue light-emitting diode that emits the blue light described above; It is preferable to have a fluorescent material that emits the green light and the red light when the blue light of the blue light emitting diode is incident.
  • the fluorescent material is a quantum dot member, It is preferable that the quantum dot member is disposed between the optical sheet member and the blue light source.
  • Formula (1) 2 ⁇ ⁇ / ⁇ ⁇ 6 (In the formula (1), ⁇ represents the maximum value of the absorbance of the retardation film, and ⁇ ⁇ represents the absorbance with respect to the wavelength at which the absorbance in the direction orthogonal to the direction in which the absorbance of the retardation film is maximized).
  • Re ( ⁇ ) represents the retardation (unit: nm) in the in-plane direction of the retardation film at the wavelength ⁇ nm.)
  • the half-value width of the absorbance peak of the retardation film is preferably 10 to 50 nm.
  • the retardation film preferably includes an absorbing material having a maximum absorbance at 595 ⁇ 10 nm or 655 ⁇ 10 nm.
  • the retardation film according to [15] is preferably such that the retardation film is a laminate of a base material and an absorbent layer containing an absorbent material, or a single layer of a base material containing an absorbent material.
  • a polarizer; A polarizing plate comprising at least one retardation film according to any one of [12] to [16].
  • the present invention it is possible to provide a liquid crystal display device in which the front luminance and the black color shift when viewed from an oblique direction are improved.
  • FIG. 1 is a schematic view showing a cross section of an example of the liquid crystal display device of the present invention.
  • FIG. 2 is a schematic view showing a cross section of another example of the liquid crystal display device of the present invention.
  • a numerical range represented by using “to” means a range including numerical values described before and after “to” as a lower limit value and an upper limit value.
  • the “half width” of a peak means the width of the peak at a peak height of 1/2.
  • the liquid crystal display device of the present invention has a retardation film, a liquid crystal cell, and a backlight unit; the retardation film has a maximum absorbance at 595 ⁇ 10 nm or 655 ⁇ 10 nm, and the following formula (1) And (2): the backlight unit has a blue light having an emission center wavelength in the wavelength band of 430 to 480 nm, a green light having an emission center wavelength in the wavelength band of 500 to 600 nm, and a wavelength band of 600 to 650 nm. And red light having an emission center wavelength.
  • Formula (1) 2 ⁇ ⁇ / ⁇ ⁇ 6 (In the formula (1), ⁇ represents the maximum value of the absorbance of the retardation film, and ⁇ ⁇ represents the absorbance with respect to the wavelength at which the absorbance in the direction orthogonal to the direction in which the absorbance of the retardation film is maximized). ) Formula (2) 1.11 ⁇ Re (630) / Re (535) ⁇ 1.25 (In the formula (2), Re ( ⁇ ) represents retardation in the in-plane direction of the retardation film (unit: nm) at the wavelength ⁇ nm.) With such a configuration, the liquid crystal display device of the present invention improves the front luminance and the black color shift when viewed obliquely.
  • the backlight unit emitting the blue light, the green light, and the red light having the emission wavelength center in a specific range has a large value such that the inverse chromatic dispersion satisfies Expression (2).
  • the retardation film having the maximum absorbance at ⁇ 10 nm or 655 ⁇ 10 nm and satisfying the formula (1) the black color shift when viewed from an oblique direction can be improved by the reverse wavelength dispersion characteristic, By using an anomalous dispersion mechanism instead of light absorption, the front luminance can be increased without substantially reducing the light utilization rate from the backlight unit.
  • the liquid crystal display device 41 of the present invention shown in FIGS. 1 and 2 includes a retardation film F3 or F4, a liquid crystal cell 11, and a backlight unit 31. Furthermore, the liquid crystal display device 41 of the present invention preferably includes the backlight side polarizer 22 and the display side polarizing plate 1, and has the viewing side polarizer 2 on the side opposite to the backlight unit 31 with respect to the liquid crystal cell 11.
  • At least one retardation film F2 is provided between the viewing side polarizer 2 and the liquid crystal cell 11, and the backlight side polarizer 22 is provided between the liquid crystal cell 11 and the backlight unit 31. It is preferable to have at least one retardation film F3 between the backlight side polarizer 22 and the liquid crystal cell 11.
  • the retardation film may be used as an outer side polarizing plate protective film for the viewing side polarizing plate or an outer side polarizing plate protective film for the backlight side polarizing plate 21.
  • the liquid crystal display device 41 of the present invention preferably has a polarizing plate protective film (outer side polarizing plate protective film of the visual side polarizing plate) F1 on the opposite side of the viewing side polarizer 2 from the retardation film F2.
  • the liquid crystal display device 41 of the present invention has a polarizing plate protective film (the aforementioned outer side polarizing plate protective film of the backlight side polarizing plate 21) F4 on the opposite side of the retardation film F3 of the backlight side polarizer 22.
  • the retardation film described above is preferably a laminate of a base material and an absorbing layer containing the above-described absorbing material, or a single layer of the base material containing the above-described absorbing material.
  • the retardation film F2 is a laminate of the base material 4 and the absorbent layer 3 containing the absorbent material as shown in FIG. 2, or a single layer of the base material 4 containing the absorbent material as shown in FIG. Is preferred.
  • the retardation film F3 is a laminate of the base material 24 and the absorbent layer 23 containing the absorbent material as shown in FIG. 2, or a single layer of the base material 24 containing the absorbent material as shown in FIG. It is preferable.
  • the liquid crystal display device of the present invention has a polarizer between the liquid crystal cell and the backlight unit and on at least one side of the liquid crystal cell opposite to the backlight unit, and the retardation film has a maximum absorbance. It is preferable that the value direction is parallel to the absorption axis of the polarizer from the viewpoint of further suppressing the reduction in front luminance.
  • the liquid crystal display device 41 of the present invention shown in FIGS. 1 and 2 includes a backlight side polarizer 22 between the liquid crystal cell 11 and the backlight unit 31, and the backlight unit 31 with respect to the liquid crystal cell 11. Has a viewing side polarizer 2 on the opposite side.
  • the direction in which the absorbance of the retardation film F2 is maximum is parallel to the absorption axis of the backlight side polarizer 22 or the viewing side polarizer 2
  • the direction in which the absorbance of the retardation film F3 is maximum is preferably parallel to the absorption axis of the backlight side polarizer 22 or the viewing side polarizer 2.
  • the above-mentioned retardation film has a maximum absorbance at 595 ⁇ 10 nm or 655 ⁇ 10 nm, and satisfies the following formulas (1) and (2).
  • Formula (1) 2 ⁇ ⁇ / ⁇ ⁇ 6 (In the formula (1), ⁇ represents the maximum value of the absorbance of the retardation film, and ⁇ ⁇ represents the absorbance with respect to the wavelength at which the absorbance in the direction orthogonal to the direction in which the absorbance of the retardation film is maximized).
  • Re ( ⁇ ) represents retardation in the in-plane direction of the retardation film (unit: nm) at the wavelength ⁇ nm.
  • the retardation film of the present invention is particularly preferable to use the following novel retardation film of the present invention.
  • the slopes of the chromatic dispersion on the short wavelength side and the long wavelength side are different, and deviated from the linear chromatic dispersion over the ideal short wavelength to long wavelength.
  • the slopes of chromatic dispersion on the short wavelength side and the long wavelength side can be matched, and optical compensation close to the ideal can be realized over a short wavelength to a long wavelength.
  • the black color shift is greatly improved.
  • the retardation film of the present invention is specifically the following first and second aspects.
  • the first aspect of the retardation film of the present invention has a maximum absorbance value at 595 ⁇ 10 nm, satisfies the following formulas (1) to (3), and a phase difference and a direction in which the absorbance of the retardation film becomes the maximum value. It is a retardation film in which the slow axis of the film is parallel.
  • Formula (1) 2 ⁇ ⁇ / ⁇ ⁇ 6 (In the formula (1), ⁇ represents the maximum value of the absorbance of the retardation film, and ⁇ ⁇ represents the absorbance with respect to the wavelength at which the absorbance in the direction orthogonal to the direction in which the absorbance of the retardation film is maximized).
  • Re ( ⁇ ) represents the retardation (unit: nm) in the in-plane direction of the retardation film at the wavelength ⁇ nm.
  • the first aspect of the retardation film of the present invention in which the direction in which the absorbance is maximum (so-called absorption anisotropy axis) is parallel to the slow axis of the retardation film is as follows.
  • ⁇ n ns ⁇ nf; nf represents the refractive index in the fast axis direction of the retardation film
  • Linear (Short wavelength wave Dispersing a is Re (535) / Re (450) and the same degree of inclination), namely can achieve the phase difference film is a reverse wavelength dispersion satisfying the above expression (3), it is possible to further improve the black color shift.
  • the second aspect of the retardation film of the present invention has a maximum absorbance at 655 ⁇ 10 nm, satisfies the following formulas (1) to (3), and a direction and retardation in which the absorbance of the retardation film is maximum. It is a retardation film in which the slow axes of the films are orthogonal.
  • Formula (1) 2 ⁇ ⁇ / ⁇ ⁇ 6 (In the formula (1), ⁇ represents the maximum value of the absorbance of the retardation film, and ⁇ ⁇ represents the absorbance with respect to the wavelength at which the absorbance in the direction orthogonal to the direction in which the absorbance of the retardation film is maximized).
  • Re ( ⁇ ) represents the retardation (unit: nm) in the in-plane direction of the retardation film at the wavelength ⁇ nm.
  • the first aspect of the retardation film of the present invention in which the direction in which the absorbance is maximum (so-called absorption anisotropy axis) is orthogonal to the slow axis of the retardation film is a long wavelength exceeding red light.
  • the first aspect of the above-described retardation film and the retardation film of the present invention preferably has a maximum absorbance at 595 ⁇ 10 nm, preferably has a maximum absorbance at 595 ⁇ 5 nm, and has an absorbance at 595 ⁇ 3 nm. More preferably, it has a maximum value.
  • the second aspect of the above-described retardation film and the retardation film of the present invention preferably has a maximum absorbance at 655 ⁇ 10 nm, preferably has a maximum absorbance at 655 ⁇ 5 nm, and has an absorbance at 655 ⁇ 3 nm. More preferably, it has a maximum value.
  • the above-mentioned retardation film and the retardation film of the present invention satisfy the following formula (1).
  • Formula (1) 2 ⁇ ⁇ / ⁇ ⁇ 6
  • ⁇ represents the maximum value of the absorbance of the retardation film
  • ⁇ ⁇ represents the absorbance with respect to the wavelength at which the absorbance in the direction orthogonal to the direction in which the absorbance of the retardation film is maximized.
  • ⁇ / ⁇ is 2 or more, it is possible to improve the black color shift when viewed obliquely as compared to when it is less than 2.
  • ⁇ / ⁇ ⁇ is 6 or less, it is possible to improve the black color shift when viewed obliquely, rather than when it exceeds 6.
  • ⁇ / ⁇ ⁇ is preferably 2.5 to 5.5, more preferably 3 to 5, and particularly preferably 3.5 to 4.5.
  • the above-mentioned retardation film and the retardation film of the present invention satisfy the following formula (2).
  • Formula (2) 1.11 ⁇ Re (630) / Re (535) ⁇ 1.25
  • Re ( ⁇ ) represents retardation in the in-plane direction of retardation film at wavelength ⁇ nm (unit: nm).
  • Re (630) / Re (535) is 1.11 or more, it is possible to improve the black color shift when viewed obliquely as compared to when it is less than 1.11.
  • Re (630) / Re (535) is 1.25 or less, it is possible to improve the black color shift when viewed obliquely as compared to when exceeding 1.25.
  • Re (630) / Re (535) is preferably 1.14 to 1.22, and more preferably 1.16 to 1.20.
  • the retardation film described above preferably satisfies the following formula (3) from the viewpoint of improving the black color shift when viewed from an oblique direction by matching the inclinations of chromatic dispersion on the short wavelength side and the long wavelength side.
  • Formula (3) 0.90 ⁇ ⁇ Re (535) / Re (450) ⁇ / ⁇ Re (630) / Re (535) ⁇ ⁇ 1.1
  • Re ( ⁇ ) represents retardation (unit: nm) in the in-plane direction of the retardation film at the wavelength ⁇ nm.
  • Re (630) / Re (535) is preferably 0.95 to 1.05, more preferably 0.98 to 1.02.
  • the direction in which the absorbance of the retardation film has a maximum value is parallel to the slow axis of the retardation film, that is, the first aspect of the retardation film of the present invention. Is more preferable than the second embodiment of the retardation film of the present invention.
  • Re (535) is preferably 20 to 90 nm, more preferably 30 to 80 nm, and particularly preferably 40 to 70 nm.
  • the retardation film has a retardation Rth (535) in the film thickness direction of preferably 80 to 170 nm, more preferably 90 to 160 nm, and particularly preferably 100 to 150 nm.
  • Re, Rth, and Nz at a wavelength ⁇ nm can be measured as follows.
  • Re is measured with KOBRA 21ADH (manufactured by Oji Scientific Instruments Co., Ltd.) by making light of wavelength ⁇ nm incident in the normal direction of the film.
  • Rth is measured by making light of wavelength ⁇ nm incident from the direction inclined + 40 ° with respect to the film normal direction with the above-mentioned Re and in-plane slow axis (determined by KOBRA 21ADH) as the tilt axis (rotation axis).
  • KOBRA 21ADH The retardation value measured and the retardation value measured by making light of wavelength ⁇ nm incident from a direction inclined ⁇ 40 ° with respect to the film normal direction with the in-plane slow axis as the tilt axis (rotation axis) 3 in total
  • KOBRA 21ADH is used for calculation.
  • the assumed value of the average refractive index values in the thermoplastic handbook (John Wiley & Sons, Inc.) and catalogs of various optical films can be used. Those whose average refractive index is not known can be measured with an Abbe refractometer.
  • the average refractive index values of main optical films are exemplified below: cellulose acylate (1.48), cycloolefin thermoplasticity (1.52), polycarbonate (1.59), polymethyl methacrylate (1.49) Polystyrene (1.59).
  • an angle for example, an angle such as “90 °”
  • a relationship for example, “orthogonal”, “parallel”, “intersection at 45 °”, etc.
  • the range of errors to be included for example, it means that the angle is within the range of strict angle ⁇ 10 °, and the error from the strict angle is preferably 5 ° or less, and more preferably 3 ° or less.
  • the “slow axis” of a retardation film or the like means a direction in which the refractive index is maximized.
  • the “fast axis” of a retardation film or the like means a direction orthogonal to the direction in which the refractive index is maximum.
  • numerical values, numerical ranges, and qualitative expressions for example, “equivalent”, “equal”, etc.) indicating optical characteristics of each member such as a retardation region, a retardation film, and a liquid crystal layer are used. ) Is interpreted to indicate numerical values, numerical ranges and properties including generally allowable errors for liquid crystal display devices and members used therefor.
  • “front” means a normal direction relative to the display surface
  • “front luminance” means white luminance measured in the normal direction of the display surface.
  • the above-mentioned retardation film has an absorbing material having a maximum absorbance at 595 ⁇ 10 nm or 655 ⁇ 10 nm.
  • the retardation film is preferably a laminate of a base material and an absorbent layer containing an absorbent material, or a single layer of a base material containing an absorbent material. A layer is more preferable from the viewpoint of manufacturing simplicity.
  • the above-mentioned absorption material may be kneaded into the base material constituting the retardation film, and includes the above-mentioned absorption material separately from the base material constituting the retardation film. May be provided.
  • the absorbing layer may consist of one layer or two or more layers.
  • One of the layers constituting the absorbent layer may be a layer containing two or more kinds of absorbent materials, and each of the plurality of layers constituting the absorbent layer may contain one kind of absorbent material.
  • the above-mentioned absorbing material is preferably a dye or a pigment, and more preferably a dye.
  • cyanine-based, squarylium-based, azomethine-based, xanthene-based, oxonol-based or azo-based compounds are preferable, and cyanine-based and oxonol-based dyes are more preferably used.
  • An example of an absorbing material having a maximum absorbance at 595 ⁇ 10 nm is shown below.
  • the oxonol dye can be synthesized with reference to the descriptions in JP-A-7-230671, European Patent 0778493 and US Pat. No. 5,459,265.
  • merocyanine dyes reference can be made to the descriptions in US Pat. No. 2,170,806 and JP-A Nos. 55-155350 and 55-161232.
  • anthraquinone dyes descriptions of British Patent No. 710060, US Pat. No. 3,575,704, JP-A-48-5425 and Hiroshi Horiguchi, review, synthetic dyes (Sankyo Publishing, published in 1968) You can refer to it.
  • FM Harmer "Heterocyclic Compounds-Cyanine Compounds-Cyanine Dies and Related Compounds” and John Willy, also known as FM Harmer, "Heterocyclic Compounds-Cyanine Soybeans and Related Compounds”. * Sons (John Wiley and Sons), New York, London, 1964; "D. M.
  • the dye two or more kinds of pigments as described above can be used in combination.
  • the wavelength when the dye is in an aggregated state, the wavelength generally shifts to the longer wavelength side, and the peak becomes sharp.
  • some dyes having an absorption maximum in the wavelength range of 480 to 520 nm include those aggregates having an absorption maximum in the range of 595 ⁇ 10 nm.
  • the dye having the maximum absorption in the wavelength band of 480 to 520 nm squarylium, azomethine, cyanine, oxonol, anthraquinone, azo or benzylidene compounds are preferably used.
  • azo dye many azo dyes described in GB539703, 575691, US29556879 and Hiroshi Horiguchi's “Review Synthetic Dye” Sankyo Publishing, etc. can be used. Specific examples include the compounds described in [0018] to [0020] of JP-A-2008-203436. When such a dye is used in a state where an aggregate is partially formed, an absorption maximum can be obtained in both the wavelength range of 480 to 520 m and the wavelength range of 595 ⁇ 10 nm. Examples of such dyes are shown below.
  • the dye in an associated state forms a so-called J band and shows a sharp absorption spectrum peak.
  • the association of dyes and the J band are described in various literatures (for example, Photographic Science and engineering Vol. 18, No. 323-335 (1974)).
  • the absorption maximum of the dye in the J-association state moves to the longer wave side than the absorption maximum of the dye in the solution state. Therefore, whether the dye contained in the absorption layer is in an associated state or a non-associated state can be easily determined by measuring the absorption maximum.
  • the movement of the absorption maximum is preferably 30 nm or more, more preferably 40 nm or more, and most preferably 45 nm or more.
  • the dye used in the associated state is preferably a methine dye, and most preferably a cyanine dye or an oxonol dye.
  • These dyes include compounds that form aggregates only by dissolving in water, but in general, gelatin or a salt (eg, barium chloride, calcium chloride, sodium chloride) is added to an aqueous dye solution to form an aggregate. Can be formed.
  • a method for forming the aggregate a method of adding gelatin to an aqueous dye solution is particularly preferable.
  • a plurality of dyes having different absorption maximums can be dispersed in an aqueous solution to which gelatin is added, and then mixed to prepare a sample containing a plurality of aggregates having different absorption maximums.
  • each aggregate can be formed simply by dispersing a plurality of dyes in an aqueous solution containing gelatin.
  • the dye aggregate can also be formed as a solid fine particle dispersion of the dye.
  • a known disperser can be used. Examples of the disperser include a ball mill, a vibrating ball mill, a planetary ball mill, a sand mill, a colloid mill, a jet mill, and a roller mill.
  • the disperser is described in JP-A-52-92716 and WO88 / 074794. A vertical or horizontal medium disperser is preferred.
  • Examples of the absorbing material having the maximum absorbance at 655 ⁇ 10 nm include the dye compounds described in Journal of Information Recording Materials, (1988), 16 (1), 23-31. Are incorporated into the present invention. Specific examples of the absorbing material having the maximum absorbance at 655 ⁇ 10 nm include the following compounds.
  • Examples of other absorbing materials include dye compounds described in JP-A No. 2000-32419, JP-A No. 2002-122729, and JP-P 45044496. The contents of these publications are incorporated in the present invention. It is.
  • the content of the dye in the absorbing layer is preferably 0.001 to 0.050% by mass, more preferably 0.001 to 0.030% by mass with respect to the total mass of the absorbing layer. It is particularly preferably 010 to 0.030% by mass.
  • the absorption spectrum of the absorbing material having the maximum absorbance at 595 ⁇ 10 nm or 655 ⁇ 10 nm is sharp in order to selectively cut the light so as not to affect the aforementioned blue light, green light and red light.
  • the half width of the absorption spectrum of the absorbing material having the maximum absorbance at 595 ⁇ 10 nm (the width of the wavelength region showing the absorbance at half the absorbance at the absorption maximum) is 5 to 50 nm, More preferably, it is 10 to 50 nm.
  • the full width at half maximum of the absorption spectrum of the absorbing material having the maximum absorbance at 655 ⁇ 10 nm is preferably 5 to 50 nm, and more preferably 10 to 50 nm.
  • a plurality of dyes or pigments having different absorption maxima in one wavelength region are contained in the layer containing the absorbing material, or an aggregate of dyes is contained in the layer containing the absorbing material.
  • the means of making it etc. are mentioned.
  • methine dyes for example, cyanine, merocyanine, oxonol, pyromethene, styryl, arylidene
  • diphenylmethane dye triphenylmethane dye
  • xanthene dye squarylium dye
  • croconium dye azine dye, acridine dye, thiazine dye
  • oxazine dyes can be selected.
  • These dyes are preferably used in aggregates.
  • an additive such as an infrared absorber or an ultraviolet absorber may be added to the absorption layer, and those described in [0031] of JP-A-2008-203436 can be used.
  • the absorbent layer When the retardation film is a laminate of an absorbent layer containing a base material and an absorbent material, the absorbent layer preferably contains a polymer binder, as described in JP-A-2008-203436, [0032] to [0034]. Can be used.
  • an undercoat layer can be provided on the support when the absorbent layer is provided on a support such as an arbitrary base material.
  • the undercoat layer those described in JP-A-2008-203436, [0039] can be used.
  • the absorbent layer can be formed by the method described in [0040] of JP-A-2008-203436.
  • the retardation film is a laminate of an absorbent layer containing a base material and an absorbent material or a single layer of a base material containing an absorbent material that is a single layer of a base material containing an absorbent material.
  • a known substrate can be used.
  • thermoplastic resin excellent in transparency, mechanical strength, thermal stability, moisture barrier property, isotropy and the like is used.
  • thermoplastic resins include cellulose ester resins, polyester resins, polyethersulfone resins, polysulfone resins, polycarbonate resins, polyamide resins, polyimide resins, polyolefin resins, (meth) acrylic resins, cyclic polyolefin resins ( Norbornene resin), polyarylate resin, polystyrene resin, polyvinyl alcohol resin, and mixtures thereof.
  • the base material of the surface film F1 is preferably a cyclic polyolefin resin, a cellulose resin, or a polyester resin, more preferably a cyclic polyester resin, a cellulose acylate resin, or polyethylene terephthalate, and particularly preferably a cellulose acylate resin.
  • Cellulose ester resin is an ester of cellulose and fatty acid. Specific examples of the cellulose ester resin include triacetyl cellulose, diacetyl cellulose, tripropyl cellulose, dipropyl cellulose, and the like. A preferred embodiment of the cellulose ester resin used for the retardation film is the same as the preferred embodiment of the cellulose acylate having an acyl substitution degree of 2.0 to 2.6 described in JP2012-068661A. The contents are incorporated into the present invention.
  • cyclic polyolefin resin examples are preferably norbornene resins.
  • the cyclic olefin-based resin is a general term for resins that are polymerized using a cyclic olefin as a polymerization unit, and is described in, for example, JP-A-1-240517, JP-A-3-14882, JP-A-3-122137, and the like. Resin.
  • cyclic olefin ring-opening (co) polymers examples include cyclic olefin addition polymers, cyclic olefins and ⁇ -olefins such as ethylene and propylene (typically random copolymers), And the graft polymer which modified these with unsaturated carboxylic acid or its derivative (s), and those hydrides, etc. are mentioned.
  • Specific examples of the cyclic olefin include norbornene monomers.
  • cyclic polyolefin resins Various products are commercially available as cyclic polyolefin resins. Specific examples include the product names “ZEONEX” and “ZEONOR” manufactured by ZEON CORPORATION, the product name “ARTON” manufactured by JSR Corporation, the product name “TOPAS” manufactured by TICONA, and the product rules manufactured by Mitsui Chemicals, Inc. “APEL” may be mentioned.
  • any appropriate (meth) acrylic resin can be adopted as long as the effects of the present invention are not impaired.
  • poly (meth) acrylate such as polymethyl methacrylate, methyl methacrylate- (meth) acrylic acid copolymer, methyl methacrylate- (meth) acrylic acid ester copolymer, methyl methacrylate-acrylic acid ester- (Meth) acrylic acid copolymers, (meth) methyl acrylate-styrene copolymers (MS resin, etc.), polymers having an alicyclic hydrocarbon group (for example, methyl methacrylate-cyclohexyl methacrylate copolymer, And methyl methacrylate- (meth) acrylate norbornyl copolymer).
  • Preferable examples include C1-6 alkyl poly (meth) acrylates such as poly (meth) acrylate methyl. More preferred is a methyl methacrylate resin containing methyl methacrylate as a main component (50 to 100% by mass, preferably 70 to 100% by mass).
  • the (meth) acrylic resin examples include, for example, (Meth) acrylic resin having a ring structure in the molecule described in Acrypet VH and Acrypet VRL20A manufactured by Mitsubishi Rayon Co., Ltd., and JP-A-2004-70296. And a high Tg (meth) acrylic resin system obtained by intramolecular crosslinking or intramolecular cyclization reaction.
  • (Meth) acrylic resin having a lactone ring structure can also be used as the (meth) acrylic resin. It is because it has high mechanical strength by high heat resistance, high transparency, and biaxial stretching.
  • the retardation of the retardation film on the viewing side polarizing plate is 1.48 as the average refractive index. Measure.
  • the above Re and Rth are the types of thermoplastic resins used in the above-mentioned retardation film (if the thermoplastic resin used in the retardation film is a cellulose ester, for example, the degree of substitution of the cellulose ester), added with the thermoplastic resin It can be adjusted by the amount of the agent, the addition of the retardation developer, the film thickness, the stretching direction and stretching ratio of the film.
  • Preferred embodiments of the additive used for the retardation film include sugar ester compounds described in JP 2012-068661 A, additive having a negative intrinsic birefringence, nitrogen-containing aromatic compound plasticizer, fine particles, and expression of retardation. It is the same as that of the preferable aspect of an agent, The content of this gazette is integrated in this invention.
  • a preferred embodiment of the method for producing a retardation film is the same as the preferred embodiment of the method for producing a cellulose acylate film described in JP 2012-066861 A, and the contents of this publication are incorporated in the present invention.
  • the thickness of the retardation film and the protective film described later can be appropriately set, but is generally about 1 to 500 ⁇ m from the viewpoints of strength, workability such as handling, and thin layer properties. 1 to 300 ⁇ m is particularly preferable, and 5 to 200 ⁇ m is more preferable. A retardation film and a protective film described later are particularly suitable when the thickness is 5 to 150 ⁇ m.
  • the polarizing plate of the present invention has a polarizer and at least one retardation film of the present invention.
  • the polarizing plate of the present invention usually has a polarizer and two polarizing plate protective films (hereinafter also referred to as protective films) disposed on both sides of the polarizing plate, similarly to the polarizing plate used in a liquid crystal display device.
  • protective films it is preferable that the retardation film of the present invention is used as a protective film having at least one retardation film of the present invention and disposed on the liquid crystal cell side.
  • a polarizing plate protective film may be included on the surface of the polarizer on the backlight unit side. It does not have to be.
  • polarizer As the above-mentioned polarizer, it is preferable to use a polymer film in which iodine is adsorbed and oriented.
  • the polymer film is not particularly limited, and various types can be used.
  • polyvinyl alcohol films, polyethylene terephthalate films, ethylene / vinyl acetate copolymer films, partially saponified films of these, hydrophilic polymer films such as cellulose films, polyvinyl alcohol dehydrated products and polychlorinated Examples include polyene-based oriented films such as vinyl dehydrochlorinated products.
  • the polyvinyl alcohol film is made of polyvinyl alcohol or a derivative thereof.
  • Derivatives of polyvinyl alcohol include polyvinyl formal, polyvinyl acetal and the like, olefins such as ethylene and propylene, unsaturated carboxylic acids such as acrylic acid, methacrylic acid and crotonic acid, alkyl esters thereof, acrylamide and the like. can give.
  • the polymerization degree of the polymer that is the material of the polymer film is generally 500 to 10,000, preferably in the range of 1000 to 6000, and more preferably in the range of 1400 to 4000. Furthermore, in the case of a saponified film, the degree of saponification is preferably 75 mol% or more, more preferably 98 mol% or more, for example, from the viewpoint of solubility in water, and more preferably 98.3 to 99.8 mol. % Is more preferable.
  • the aforementioned polymer film (unstretched film) is at least subjected to uniaxial stretching treatment and iodine dyeing treatment according to a conventional method. Furthermore, boric acid treatment and washing treatment can be performed. Further, the polymer film (stretched film) subjected to the above-described treatment is dried according to a conventional method to become a polarizer.
  • the stretching method in the uniaxial stretching process is not particularly limited, and either a wet stretching method or a dry stretching method can be employed.
  • the stretching means of the dry stretching method include an inter-roll stretching method, a heated roll stretching method, and a compression stretching method. Stretching can also be performed in multiple stages.
  • the unstretched film is usually heated.
  • the stretch ratio of the stretched film can be appropriately set according to the purpose, but the stretch ratio (total stretch ratio) is about 2 to 8 times, preferably 3 to 7 times, more preferably 3.5 to 6.5 times. Is desirable.
  • the iodine staining treatment is performed, for example, by immersing the polymer film in an iodine solution containing iodine and potassium iodide.
  • the iodine solution is usually an iodine aqueous solution, and contains iodine and potassium iodide as a dissolution aid.
  • the iodine concentration is about 0.01 to 1% by mass, preferably 0.02 to 0.5% by mass, and the potassium iodide concentration is about 0.01 to 10% by mass, and further 0.02 to 8% by mass. It is preferable to use it.
  • the temperature of the iodine solution is usually about 20 to 50 ° C., preferably 25 to 40 ° C.
  • the immersion time is usually about 10 to 300 seconds, preferably 20 to 240 seconds.
  • the iodine dyeing treatment the iodine content and potassium content in the polymer film are adjusted to the above-mentioned ranges by adjusting the conditions such as the concentration of the iodine solution, the immersion temperature of the polymer film in the iodine solution, and the immersion time. To do.
  • the iodine dyeing process may be performed at any stage before the uniaxial stretching process, during the uniaxial stretching process, or after the uniaxial stretching process.
  • the iodine content of the above-mentioned polarizer is, for example, in the range of 2 to 5% by mass, preferably in the range of 2 to 4% by mass in consideration of optical characteristics.
  • the aforementioned polarizer preferably contains potassium.
  • the potassium content is preferably in the range of 0.2 to 0.9% by mass, more preferably in the range of 0.5 to 0.8% by mass.
  • a polarizing film having a preferable composite elastic modulus (Er) and a high degree of polarization can be obtained.
  • the potassium can be contained, for example, by immersing a polymer film, which is a material for forming a polarizer, in a solution containing potassium.
  • the aforementioned solution may also serve as a solution containing iodine.
  • drying treatment step a conventionally known drying method such as natural drying, blow drying, or heat drying can be used.
  • the heating temperature is about 20 to 80 ° C.
  • the drying time is about 1 to 10 minutes.
  • stretch suitably also in this drying process process.
  • the thickness of the polarizer is not particularly limited, and is usually 5 to 300 ⁇ m, preferably 10 to 200 ⁇ m, and more preferably 20 to 100 ⁇ m.
  • the single transmittance when measured with a single polarizer is preferably 43% or more, and more preferably in the range of 43.3 to 45.0%. Further, it is preferable that the orthogonal transmittance measured by superposing two polarizers described above so that the absorption axes of the two polarizers are 90 ° with each other is smaller, and practically 0.00 % Or more and 0.050% or less is preferable, and 0.030% or less is more preferable.
  • the degree of polarization is preferably 99.90% or more and 100% or less for practical use, and particularly preferably 99.93% or more and 100% or less. Even when measured as a polarizing plate, it is preferable to obtain optical characteristics substantially equivalent to this.
  • the polarizing plate of the present invention may or may not have a polarizing plate protective film on the side opposite to the liquid crystal cell of the polarizer.
  • a thermoplastic resin excellent in transparency, mechanical strength, thermal stability, moisture barrier property, isotropy and the like is used as the protective film disposed on the side opposite to the liquid crystal cell.
  • a thermoplastic resin excellent in transparency, mechanical strength, thermal stability, moisture barrier property, isotropy and the like is used.
  • a thermoplastic resin include the thermoplastic resins mentioned as the base material of the retardation film.
  • a cellulose resin is preferable, and triacetyl cellulose is particularly preferable. Many products of triacetylcellulose are commercially available, which is advantageous in terms of availability and cost.
  • Examples of commercially available products of triacetylcellulose include the product names “UV-50”, “UV-80”, “SH-80”, “TD-80U”, “TD-TAC”, “UZ” manufactured by Fujifilm Corporation. -TAC ",” TD60UL “and” KC series "manufactured by Konica.
  • Adhesives, pressure-sensitive adhesives, and the like can be appropriately employed for laminating the above-described polarizer and the retardation film or protective film depending on the polarizer and the retardation film or protective film.
  • the adhesive and the adhesion treatment method are not particularly limited.
  • an adhesive made of a vinyl polymer, or at least a vinyl alcohol polymer such as boric acid, borax, glutaraldehyde, melamine, or oxalic acid It can be carried out via an adhesive comprising a water-soluble crosslinking agent.
  • the adhesive layer made of such an adhesive can be formed as an aqueous solution coating / drying layer, etc.
  • a crosslinking agent In preparing the aqueous solution, a crosslinking agent, other additives, and a catalyst such as an acid are also blended as necessary. be able to.
  • a polyvinyl alcohol polymer film is used as the polarizer, it is preferable from the viewpoint of adhesiveness to use an adhesive containing a polyvinyl alcohol resin.
  • an adhesive containing a polyvinyl alcohol-based resin having an acetoacetyl group is more preferable from the viewpoint of improving durability.
  • the above-mentioned polyvinyl alcohol resin is not particularly limited, but preferably has an average degree of polymerization of about 100 to 3000 and an average degree of saponification of about 85 to 100 mol% from the viewpoint of adhesiveness.
  • the concentration of the aqueous adhesive solution is not particularly limited, but is preferably 0.1 to 15% by mass, and more preferably 0.5 to 10% by mass.
  • the thickness of the adhesive layer is preferably about 30 to 1000 nm, more preferably 50 to 300 nm in terms of the thickness after drying. If this thickness is too thin, the adhesive strength is insufficient, and if it is too thick, the probability of appearance problems increases.
  • thermosetting resins such as (meth) acrylic, urethane-based, acrylurethane-based, epoxy-based, silicone-based, or ultraviolet curable resins can be used.
  • the backlight unit has a blue light having an emission center wavelength in a wavelength band of 430 to 480 nm, a green light having an emission center wavelength in a wavelength band of 500 to 600 nm, and a wavelength band of 600 to 650 nm. And red light having an emission center wavelength.
  • the wavelength band of the blue light emitted from the backlight unit is preferably 450 to 480 nm, and more preferably 460 to 470 nm.
  • the wavelength band of the green light emitted from the backlight unit is preferably 520 to 550 nm, and more preferably 530 to 540 nm.
  • the wavelength band of the red light emitted from the backlight unit is preferably 610 to 650 nm, and more preferably 620 to 640 nm.
  • the configuration of the backlight unit may be an edge light method using a light guide plate, a reflection plate, or the like as a constituent member, or may be a direct type. It is preferable to provide.
  • a light guide plate a reflection plate, or the like as a constituent member
  • limiting in particular as such a reflecting member A well-known thing can be used, and it is described in patent 3416302, patent 3363565, patent 4091978, patent 3448626, etc., The content of these gazettes is this Incorporated into the invention.
  • the half-value widths of the respective emission intensities of the blue light, green light and red light emitted from the backlight unit are preferably 100 nm or less, and preferably 50 nm or less. More preferably, it is particularly preferably 45 nm or less, and particularly preferably 40 nm or less. Among these, it is even more particularly preferable that the half-value width of each emission intensity of the blue light is 30 nm or less.
  • the light source of the backlight unit is incident on the blue light emitting diode that emits the blue light and the blue light of the blue light emitting diode that is incident on the light source of the backlight unit.
  • the blue light emitting diode that emits blue light, the green light emitting diode that emits green light, and the red light emitting diode that emits red light may be used.
  • the backlight unit emits the ultraviolet light emitting diode that emits ultraviolet light, and emits the blue light, the green light, and the red light when the ultraviolet light of the ultraviolet light emitting diode is incident.
  • a quantum dot member may be used.
  • the liquid crystal image display device of the present invention includes a blue light emitting diode that emits the blue light and a fluorescent material that emits the green light and the red light when the blue light of the blue light emitting diode is incident.
  • a quantum dot member for example, a quantum dot sheet or a bar-shaped quantum dot bar
  • the quantum dot member is preferably disposed between the optical sheet member and the blue light source.
  • a quantum dot member is not particularly limited, and a known member can be used.
  • QDEF Quantum Dot Enhancement Film, manufactured by Nanosys
  • the backlight unit has a blue wavelength selection filter that selectively transmits light having a wavelength shorter than 460 nm among the blue light described above.
  • the backlight unit has a red wavelength selection filter that selectively transmits light having a wavelength longer than 630 nm among the red light described above.
  • a blue wavelength selection filter and a red wavelength selection filter are not particularly limited, and known ones can be used, and are described in Japanese Patent Application Laid-Open No. 2008-52067. Incorporated into the invention.
  • the backlight unit preferably further includes a known diffusion plate, diffusion sheet, prism sheet (for example, BEF), and a light guide.
  • a known diffusion plate for example, BEF
  • prism sheet for example, BEF
  • a light guide for example, a known diffusion plate, diffusion sheet, prism sheet (for example, BEF), and a light guide.
  • Other members are also described in Japanese Patent No. 3416302, Japanese Patent No. 3363565, Japanese Patent No. 4091978, Japanese Patent No. 3448626, and the contents of these publications are incorporated in the present invention.
  • the pixel in the present invention can be formed using various known RGB pixel forming methods.
  • a desired black matrix and R, G, and B pixel patterns can be formed on a glass substrate by using a photomask and a photoresist, and colored inks for R, G, and B pixels can be used.
  • Ink jet printing apparatus is used in a black matrix having a predetermined width and an area (a concave portion surrounded by convex portions) divided by a black matrix wider than the width of the black matrix described above every n.
  • the ink composition is discharged until a desired concentration is obtained, and a color filter composed of R, G, and B patterns can be produced.
  • a color filter composed of R, G, and B patterns
  • each pixel and the black matrix may be completely cured by baking or the like.
  • Preferred characteristics of the color filter are described in Japanese Patent Application Laid-Open No. 2008-083611 and the like, and the content of this publication is incorporated in the present invention.
  • it is preferable that one wavelength is 590 nm to 610 nm and the other wavelength is 470 nm to 500 nm in the color filter showing green.
  • one of the wavelengths having a transmittance that is half of the above-described maximum transmittance in the green color filter is 590 nm to 600 nm.
  • the maximum transmittance of the color filter showing green is 80% or more.
  • the wavelength having the maximum transmittance is preferably 530 nm or more and 560 nm or less.
  • the transmittance at the wavelength of the above-described emission peak is preferably 10% or less of the maximum transmittance.
  • the above-described color filter exhibiting red color preferably has a transmittance at 580 nm or more and 590 nm or less of 10% or less of the maximum transmittance.
  • color filter pigment blue is C.I. I. Pigment Blue 15: 6 and complementary pigment C.I. I. Pigment Violet 23 is used. In red, C.I. I. Pigment Red 254 as a complementary color C.I. I. Pigment Yellow 139 is used.
  • green pigment C.I. I. Pigment Green 36 (copper bromide phthalocyanine green), C.I. I. Pigment Green 7 (copper chloride phthalocyanine green) as a complementary color pigment C.I. I. Pigment Yellow 150 or C.I. I. Pigment Yellow 138 or the like is used. It can be controlled by adjusting the composition of these pigments.
  • the half-value wavelength on the long wavelength side can be set in the range of 590 nm to 600 nm.
  • pigments are generally used.
  • color filters using dyes may be used as long as they are pigments that can control spectroscopy and ensure process stability and reliability.
  • Black matrix In the liquid crystal display device of the present invention, it is preferable that a black matrix is disposed between each pixel.
  • the material for forming the black stripe include a material using a sputtered film of a metal such as chromium, and a light-shielding photosensitive composition in which a photosensitive resin and a black colorant are combined.
  • the black colorant include carbon black, titanium carbon, iron oxide, titanium oxide, graphite, and the like. Among these, carbon black is preferable.
  • the image display device of the present invention preferably further includes a TFT substrate having a thin layer transistor (hereinafter also referred to as TFT).
  • TFT thin layer transistor
  • the thin film transistor described above preferably includes an oxide semiconductor layer having a carrier concentration of less than 1 ⁇ 10 14 / cm 3 .
  • a preferred embodiment of the above-described thin layer transistor is described in Japanese Patent Application Laid-Open No. 2011-141522, and the contents of this publication are incorporated in the present invention.
  • Example 1 ⁇ Production of retardation film (with absorbing material)> (Preparation of cellulose acylate dope) The following composition was placed in a mixing tank, stirred to dissolve each component, further heated to 90 ° C. for about 10 minutes, and then filtered through a filter paper having an average pore size of 34 ⁇ m and a sintered metal filter having an average pore size of 10 ⁇ m.
  • Cellulose acylate solution 1 Cellulose acylate having a degree of acetyl substitution of 2.43 100 parts by mass Sugar ester having the following skeleton A and acetyl group substitution degree of 8 10 parts by mass The following compound (1) 5 parts by mass Compound 3 0.017 parts by mass Methylene chloride 403 parts by mass Methanol 60 .2 parts by mass ⁇
  • the above-mentioned dope was cast using a band casting machine.
  • the band was made of SUS.
  • the web (film) obtained by casting was peeled off from the band, and then dried for 20 minutes in this tenter apparatus using a tenter apparatus that clips and conveys both ends of the web with clips.
  • the drying temperature here means the film surface temperature of a film.
  • the obtained web (film) is peeled off from the band, sandwiched between clips, and when the amount of residual solvent is 30 to 5% relative to the total mass of the film, the stretching temperature is 170 ° C. and the stretching ratio under the conditions of fixed-end uniaxial stretching. It extended
  • the clip was removed from the film and dried at 110 ° C. for 30 minutes.
  • the cast film thickness was adjusted so that the film thickness after stretching was 64 ⁇ m.
  • the film subjected to the stretching treatment was sequentially subjected to a condensation prevention treatment, a wet heat treatment (water vapor contact treatment) and a heat treatment.
  • the film temperature 100 ° C.
  • the film temperature was adjusted by applying dry air to the film.
  • the wet heat treatment absolute humidity is 300 g / m 3
  • the dew point of the wet gas is 10 times higher than the temperature of each film.
  • the film was transported while maintaining a state where the temperature of the film (wet heat treatment temperature) was 100 ° C. for only the treatment time (60 seconds).
  • the absolute humidity of the gas in the heat treatment chamber (heat treatment absolute humidity) is set to 0 g / m 3
  • the temperature of each film (heat treatment temperature) is set to the same temperature as the wet heat treatment temperature, and the treatment time (2 minutes) is maintained. did.
  • the film surface temperature was determined from the average value obtained by attaching a tape-type thermocouple surface temperature sensor (ST series manufactured by Anri Keiki Co., Ltd.) to the film at three points. The film thus obtained was used as the retardation film of Example 1.
  • Example 1 of Japanese Patent Application Laid-Open No. 2001-141926, a peripheral speed difference was given between two pairs of nip rolls, and iodine was adsorbed on a polyvinyl alcohol film stretched in the longitudinal direction to produce a polarizing film.
  • the retardation film of Example 1 was attached to one side of the polarizer using a polyvinyl alcohol-based adhesive.
  • a commercially available cellulose triacetate film (Fujitac TD80UF, manufactured by FUJIFILM Corporation) was subjected to saponification treatment and attached to the opposite side of the polarizer using a polyvinyl alcohol adhesive.
  • the transmission axis of the polarizer and the in-plane slow axis of the retardation film of Example 1 were arranged in parallel. Further, the transmission axis of the polarizer and the in-plane slow axis of the commercially available cellulose triacetate film were arranged to be orthogonal to each other. Thus, the polarizing plate of Example 1 was produced.
  • the used RGB narrow-band backlight unit includes a blue light-emitting diode (Nichia B-LED, main wavelength 465 nm, half-value width 20 nm) as a light source.
  • a quantum dot member that emits fluorescence of green light having a center wavelength of 535 nm and a half-value width of 40 nm and red light having a center wavelength of 630 nm and a half-value width of 40 nm when blue light of the blue light-emitting diode is incident on the front portion of the light source is provided. .
  • the crossed Nicols were arranged so that the transmission axis of the polarizing plate on the viewing side was in the vertical direction (that is, substantially vertical direction), and the transmission axis of the polarizing plate on the backlight side was in the horizontal direction (that is, substantially horizontal direction).
  • Table 1 in the column of the transmission axis direction of the polarizer of the viewing side polarizing plate, the relationship with the slow axis of the retardation film contained in the viewing side polarizing plate, the protective film contained in the viewing side polarizing plate.
  • the column of the direction in which the absorbance of the retardation film of the viewing side polarizing plate is maximized describes the relationship with the slow axis of the retardation film of the viewing side polarizing plate.
  • the relationship between the direction in which the absorbance of the retardation film on the backlight side is maximum and the slow axis on the backlight side is not described in Table 1, the position of the viewing side polarizing plate in each Example and Comparative Example is not described.
  • the relationship between the direction in which the absorbance of the retardation film is maximized and the slow axis of the retardation film of the viewing side polarizing plate was the same.
  • the column of the transmission axis direction of the polarizer of the backlight side polarizing plate includes the relationship with the slow axis of the retardation film included in the backlight side polarizing plate, and is included in the backlight side polarizing plate.
  • the relationship with the slow axis of the protective film and the relationship with the substantially vertical direction or the substantially horizontal direction when the liquid crystal display device is arranged in parallel with the plane in which the in-plane direction of the panel includes the substantially vertical direction and the substantially horizontal direction are described.
  • the column of the direction of the absorption axis of the polarizer of the backlight side polarizing plate describes the relationship with the direction in which the absorbance of the retardation film contained in the viewing side polarizing plate is maximized.
  • Example 1 A retardation film was formed in the same manner as in Example 1 except that the compound 3 was not added to the cellulose acylate solution 1 of Example 1. The film thus obtained was used as the retardation film of Comparative Example 1. A polarizing plate and a liquid crystal display device of Comparative Example 1 were produced in the same manner as in Example 1 except that the retardation film of Comparative Example 1 was used instead of the retardation film of Example 1.
  • Comparative Example 2 A liquid crystal display device of Comparative Example 2 was prepared in the same manner as in Example 1 except that the backlight unit in the liquid crystal display device of Example 1 was returned to the backlight unit originally incorporated in the commercially available liquid crystal display device. .
  • the backlight unit of a commercially available liquid crystal display device emits light with a white LED, and unlike the RGB narrow-band backlight unit used in Example 1, it has a broad emission spectrum in the visible light range.
  • Re (630) obtained is divided by Re (535), Re (535) is divided by Re (450), and Re (630) is divided by Re (450) to obtain Re (630) / Re (535).
  • Re (535) / Re (450) obtained is divided by Re (630) / Re (535) to obtain ⁇ Re (535) / Re (450) ⁇ / ⁇ Re (630) / Re (535) ⁇ . The value was determined.
  • the retardation film of Example 1 has a value of ⁇ Re (535) / Re (450) ⁇ / ⁇ Re (630) / Re (535) ⁇ within the scope of the present invention, and has chromatic dispersion. It can be understood that ideal inverse dispersion characteristics were obtained between three wavelengths of 450, 535, and 630 nm. On the other hand, it was found that the value of ⁇ Re (535) / Re (450) ⁇ / ⁇ Re (630) / Re (535) ⁇ in the retardation film of Comparative Example 1 was outside the scope of the present invention. From the results shown in Table 1 above, it can be understood that the liquid crystal display device of Example 1 maintains the front luminance and improves the black color shift.
  • Comparative Example 1 the retardation film of Comparative Example 1 in which the value of ⁇ Re (535) / Re (450) ⁇ / ⁇ Re (630) / Re (535) ⁇ is outside the scope of the present invention was used.
  • the liquid crystal display device was found to have a poor black color shift. From the comparative example 2, it turned out that the liquid crystal display device using the backlight which is outside the range of the present invention has poor front luminance.

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  • Polarising Elements (AREA)

Abstract

Le dispositif d'affichage à cristaux liquides de l'invention comporte un film de déphasage, une cellule de cristaux liquides, et une unité de rétroéclairage. Le film de déphasage possède une valeur maximale d'absorption de la lumière de 595±10nm ou de 655±10nm, et satisfait les formules (1) et (2). L'unité de rétroéclairage génère une lumière bleue de longueur d'onde centrale de luminescence dans une bande de longueur d'onde de 430 à 480nm, une lumière verte de longueur d'onde centrale de luminescence dans une bande de longueur d'onde de 500 à 600nm, et une lumière rouge de longueur d'onde centrale de luminescence dans une bande de longueur d'onde de 600 à 650nm. Le dispositif d'affichage à cristaux liquides présente une amélioration en matière de luminance frontale et de distorsion chromatique noire en vue penchée (α représente la valeur maximale d'absorption de la lumière, α⊥ représente l'absorption de la lumière pour une longueur d'onde présentant une absorption de la lumière maximale dans une direction perpendiculaire à la direction dans laquelle l'absorption de la lumière est maximale, et Re(λ) représente un retard optique dans une direction intérieur de face à une longueur d'onde de λnm. Formule (1) 2≦α/α⊥≦6; formule (2) 1,11≦Re(630)/Re(535)≦1,25
PCT/JP2014/070587 2013-08-12 2014-08-05 Dispositif d'affichage à cristaux liquides, film de déphasage, et plaque de polarisation Ceased WO2015022878A1 (fr)

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JP2013-167916 2013-08-12
JP2013167916A JP6000916B2 (ja) 2013-08-12 2013-08-12 液晶表示装置、位相差フィルムおよび偏光板

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JP2016157117A (ja) * 2015-02-23 2016-09-01 東洋紡株式会社 液晶表示装置
JP2016157116A (ja) * 2015-02-23 2016-09-01 東洋紡株式会社 液晶表示装置
WO2017047947A1 (fr) * 2015-09-17 2017-03-23 삼성에스디아이 주식회사 Feuille optique et dispositif d'affichage optique comprenant celle-ci
CN111400901A (zh) * 2020-03-13 2020-07-10 纳晶科技股份有限公司 量子点选配方法、光致发光组件制备方法

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JP6812655B2 (ja) * 2015-04-10 2021-01-13 東洋紡株式会社 液晶表示装置
KR101854505B1 (ko) * 2015-09-17 2018-05-04 삼성에스디아이 주식회사 퀀텀닷 액정디스플레이(qd lcd) 장치
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JP2016157117A (ja) * 2015-02-23 2016-09-01 東洋紡株式会社 液晶表示装置
JP2016157116A (ja) * 2015-02-23 2016-09-01 東洋紡株式会社 液晶表示装置
JP2021015303A (ja) * 2015-02-23 2021-02-12 東洋紡株式会社 液晶表示装置
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WO2017047947A1 (fr) * 2015-09-17 2017-03-23 삼성에스디아이 주식회사 Feuille optique et dispositif d'affichage optique comprenant celle-ci
CN111400901A (zh) * 2020-03-13 2020-07-10 纳晶科技股份有限公司 量子点选配方法、光致发光组件制备方法

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