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WO2008065899A1 - Panneau à cristaux liquides et dispositif d'affichage à cristaux liquides - Google Patents

Panneau à cristaux liquides et dispositif d'affichage à cristaux liquides Download PDF

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Publication number
WO2008065899A1
WO2008065899A1 PCT/JP2007/072176 JP2007072176W WO2008065899A1 WO 2008065899 A1 WO2008065899 A1 WO 2008065899A1 JP 2007072176 W JP2007072176 W JP 2007072176W WO 2008065899 A1 WO2008065899 A1 WO 2008065899A1
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WIPO (PCT)
Prior art keywords
optical compensation
liquid crystal
compensation layer
layer
crystal cell
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
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PCT/JP2007/072176
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English (en)
Japanese (ja)
Inventor
Kentarou Takeda
Junichi Nagase
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Nitto Denko Corp
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Nitto Denko Corp
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Priority claimed from JP2007265642A external-priority patent/JP2009015279A/ja
Application filed by Nitto Denko Corp filed Critical Nitto Denko Corp
Priority to US12/516,264 priority Critical patent/US7969542B2/en
Publication of WO2008065899A1 publication Critical patent/WO2008065899A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
    • G02B5/3033—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid
    • G—PHYSICS
    • G02—OPTICS
    • 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
    • G02F1/13363—Birefringent elements, e.g. for optical compensation
    • G02F1/133634—Birefringent elements, e.g. for optical compensation the refractive index Nz perpendicular to the element surface being different from in-plane refractive indices Nx and Ny, e.g. biaxial or with normal optical axis

Definitions

  • Liquid crystal panel and liquid crystal display device Liquid crystal panel and liquid crystal display device
  • the present invention relates to a liquid crystal panel and a liquid crystal display device having the liquid crystal panel.
  • liquid crystal display device In a vertical alignment mode liquid crystal display device, light from a knock light is turned on and off for each pixel by utilizing birefringence and polarization of liquid crystal.
  • the liquid crystal molecules are vertically aligned when no voltage is applied, the polarizing plates arranged on both sides of the liquid crystal cell are placed so that the absorption axes of the polarizers are orthogonal to each other. Therefore, black can be displayed.
  • the liquid crystal is tilted by applying a voltage to the absorption axis direction of the polarizer and 45 °, 135 °, 225 °, and 315 ° directions, respectively.
  • the polarizing plate is installed so that the absorption axes of the polarizers are orthogonal to each other. As the viewing angle is tilted in an oblique direction, the absorption axis apparently deviates from orthogonal. As a result, light leakage occurs.
  • an optical compensator that compensates for the birefringence of the liquid crystal and the axial misalignment of the polarizer of the polarizing plate, for example, a biaxial retardation plate is used in the liquid crystal display device in the vertical alignment mode (for example, (See Patent Document 1).
  • the optical compensator used is for light of a specific wavelength, compensation for light of all wavelengths emitted from the backlight is not sufficient, so light leakage at a certain wavelength is not possible. happens.
  • the transmittance varies depending on the wavelength, a phenomenon in which the color appears to change when the viewing angle is changed, a so-called color shift occurs. Low these phenomena In order to reduce, it is required to compensate the wavelength of visible light over the entire area.
  • Patent Document 1 Japanese Patent Laid-Open No. 2003-270442
  • Patent Document 2 Patent No. 3648240
  • the present invention has been made to solve the above-described conventional problems, contributes to thinning, improves viewing angle characteristics, achieves high contrast, suppresses color shift, and displays black. It would be interesting to provide a liquid crystal panel and a liquid crystal display device that can prevent light leakage in the well.
  • An academic compensation layer a first polarizer
  • the first optical compensation layer and the second optical compensation layer, the third optical compensation layer and the fourth optical compensation layer are arranged in a symmetrical positional relationship with respect to the liquid crystal cell. ! /
  • the liquid crystal cell is placed on one side of the liquid crystal cell.
  • the first optical compensation layer, the second optical compensation layer, and the first polarizer are arranged, and the third liquid crystal cell is arranged in this order from the liquid crystal cell on the other side of the liquid crystal cell.
  • the optical compensation layer, the fourth optical compensation layer, and the second polarizer are disposed.
  • the second optical compensation layer and the first optical compensation layer In order from the liquid crystal cell on one side of the liquid crystal cell, the second optical compensation layer and the first optical compensation layer in this order.
  • the first polarizer is disposed, and the fourth optical compensation layer, the third optical compensation layer, and the second optical device are arranged in this order from the liquid crystal cell on the other side of the liquid crystal cell.
  • the polarizer is arranged.
  • the first optical compensation layer and the third optical compensation layer have a photoelastic coefficient of 70 X 10 — 12 (m 2 / N) or less.
  • the first optical compensation layer and the third optical compensation layer include
  • the first optical compensation layer and the third optical compensation layer include
  • the first optical compensation layer and the third optical compensation layer are
  • V formed from a material having a non-aromatic cyclic structure and an ester group.
  • the second optical compensation layer and the fourth optical compensation layer include
  • the thickness direction retardation Rth of the second optical compensation layer and the fourth optical compensation layer is 20 nm or more.
  • the first optical compensation layer and the third optical compensation layer are polymer films stretched in the width direction.
  • a liquid crystal display device includes the liquid crystal panel.
  • a liquid crystal panel that contributes to thinning, improves viewing angle characteristics, realizes high contrast, suppresses color shift, and can favorably prevent light leakage in black display, and A liquid crystal display device may be provided.
  • FIG. 1 is a schematic sectional view of a liquid crystal panel according to a preferred embodiment of the present invention.
  • FIG. 2 is a schematic cross-sectional view illustrating the alignment state of liquid crystal molecules in a liquid crystal layer in a VA mode liquid crystal cell.
  • FIG. 3 (A) is a graph showing refractive index wavelength dispersion characteristics of the first optical compensation layer and the second optical compensation layer obtained in Example 1.
  • (B) is a graph showing the refractive index wavelength dispersion characteristics of the norbornene-based resin film used in Comparative Example 4.
  • (C) shows the refractive index wavelength dispersion characteristics of the first optical compensation layer used in Example 6 and the first optical compensation layer used in Example 1.
  • FIG. 4 is a contrast contour map (a), xy chromaticity diagram (b) of the liquid crystal display device obtained in Example 1, and a graph (c) showing the relationship between X value and y value and azimuth angle. .
  • FIG. 5 is a contrast contour map (a), xy chromaticity diagram (b) of the liquid crystal display device obtained in Example 2, and a graph (c) showing the relationship between X and y values and azimuth. .
  • FIG. 6 is a contrast contour map (a), xy chromaticity diagram (b) of the liquid crystal display device obtained in Example 3, and a graph (c) showing the relationship between X value and y value and azimuth angle. .
  • FIG. 7 is a contrast contour map (a), xy chromaticity diagram (b) of the liquid crystal display device obtained in Example 4, and a graph (c) showing the relationship between X value and y value and azimuth angle. .
  • FIG. 8 is a contrast contour map (a), xy chromaticity diagram (b) of the liquid crystal display device obtained in Example 5, and a graph (c) showing the relationship between X value, y value and azimuth angle. .
  • FIG. 9 is a contrast contour map (a), xy chromaticity diagram (b) of the liquid crystal display device obtained in Comparative Example 1, and a graph (c) showing the relationship between X and y values and azimuth. . 10] Contrast contour map (a), xy chromaticity diagram (b) of the liquid crystal display device obtained in Comparative Example 2, and graph (c) showing the relationship between the X and y values and the azimuth.
  • FIG. 17 is an enlarged photograph of the screen during black display in the liquid crystal display device (a) produced in Example 1 and the liquid crystal display device (b) produced in Comparative Example 6.
  • nx is the refractive index in the direction that maximizes the in-plane refractive index (ie, slow axis direction), and “ny” is the direction that is perpendicular to the slow axis in the plane (ie, fast phase). (Axial direction), and “nz” is the refractive index in the thickness direction.
  • substantially equal is intended to include the case where nx and ny are different within a range that does not have a practical effect on the overall polarization characteristics of the liquid crystal panel.
  • In-plane retardation Re means the retardation value in the film (layer) plane measured with light at a wavelength of 590 nm at 23 ° C unless otherwise specified.
  • Thickness direction retardation Rth means a thickness direction retardation value measured at 23 ° C. with light having a wavelength of 590 nm unless otherwise specified.
  • the Nz coefficient is obtained from the following equation (1).
  • Nz (.nx—nz) / (nx—ny) (1)
  • the liquid crystal panel of the present invention includes a liquid crystal cell, a first optical compensation layer disposed on one side of the liquid crystal cell, a second optical compensation layer, a first polarizer, and the other of the liquid crystal cell.
  • a third optical compensation layer, a fourth optical compensation layer, and a second polarizer disposed on the first side, the first optical compensation layer and the second optical compensation layer, The third optical compensation layer and the fourth optical compensation layer are arranged in a symmetrical positional relationship with respect to the liquid crystal cell.
  • FIG. 1 (a) is a schematic cross-sectional view of a liquid crystal panel according to one preferred embodiment of the present invention. As shown in FIG.
  • the liquid crystal node 100 includes a liquid crystal cell 10 and a first optical compensation layer 11 and a second liquid crystal layer 10 arranged in this order from the liquid crystal cell side on one side of the liquid crystal cell 10.
  • FIG. 1 (b) is a schematic cross-sectional view of a liquid crystal panel according to another preferred embodiment of the present invention. As shown in FIG.
  • the liquid crystal panel 100 includes a liquid crystal cell 10 and a second optical compensation layer 21, a first liquid crystal cell 10 arranged in this order from the liquid crystal cell side on one side of the liquid crystal cell 10.
  • a second polarizer 32 arranged in this order from the liquid crystal sensor side to the other side of the liquid crystal cell 10.
  • the optical compensation layers having a predetermined birefringence are arranged symmetrically with the liquid crystal cell in between, so that when the liquid crystal cell is viewed from an oblique direction, the polarizers above and below the liquid crystal cell Optical defects (for example, coloring) due to deviation of the formed angle from crossed Nicols (90 °) can be compensated uniformly above and below the liquid crystal cell.
  • the viewing angle characteristics of the liquid crystal panel are improved, a high contrast is realized, the color shift is suppressed, and light leakage in black display can be prevented well.
  • the first polarizer 31 and the second polarizer 32 are arranged so that their absorption axes are substantially orthogonal to each other. Further, the first polarizer 31 is arranged so that the absorption axis thereof is substantially orthogonal to the slow axis of the first optical compensation layer 11. The second polarizer 32 is arranged such that its absorption axis is substantially perpendicular to the slow axis of the third optical compensation layer 12.
  • substantially orthogonal includes a case of 90 ° ⁇ 3.0 °, preferably 90 ° ⁇ 1.0 °, more preferably 90 ° ⁇ 0.5 °. It is.
  • each layer of the liquid crystal panel may be disposed via any appropriate pressure-sensitive adhesive layer or adhesive layer.
  • any appropriate protective layer may be provided on the side of the first polarizer 31 and / or the second polarizer 32 where the optical compensation layer is not formed (the side opposite to the liquid crystal cell).
  • any appropriate protective layer may be provided on the side of the first polarizer 31 and / or the second polarizer 32 where the optical compensation layer is formed (liquid crystal cell side).
  • the liquid crystal cell 10 used in the present invention includes a pair of substrates 41 and 42 and a liquid crystal layer 43 as a display medium disposed between the substrates.
  • the liquid crystal layer 43 includes liquid crystal molecules that are vertically aligned when no voltage is applied.
  • An example of such a liquid crystal cell is a VA mode liquid crystal cell.
  • FIG. 2 is a schematic cross-sectional view illustrating the alignment state of liquid crystal molecules in the VA mode.
  • the liquid crystal molecules are aligned perpendicular to the surfaces of the substrates 41 and 42 when no voltage is applied.
  • Such vertical alignment can be realized by arranging a nematic liquid crystal having negative dielectric anisotropy between substrates on which a vertical alignment film (not shown) is formed.
  • a vertical alignment film not shown
  • the incident light travels without changing the polarization direction and is absorbed by the second polarizer 32 having a polarization axis orthogonal to the first polarizer 31.
  • a display of a heel state can be obtained when no voltage is applied (normally black mode).
  • Fig. 2 (b) when a voltage is applied between the electrodes, the major axis of the liquid crystal molecules is oriented parallel to the substrate surface. Liquid crystal molecules exhibit birefringence with respect to linearly polarized light incident on the liquid crystal layer 43 in this state, and the polarization state of incident light changes according to the tilt of the liquid crystal molecules.
  • the light passing through the liquid crystal layer when a predetermined maximum voltage is applied becomes, for example, linearly polarized light whose polarization direction is rotated by 90 °, and thus is transmitted through the second polarizer 32 to obtain a bright display. It is done. When no voltage is applied again, the display can be returned to the cocoon state by the orientation regulating force. In addition, gradation display is possible by changing the intensity of transmitted light from the second polarizer 32 by changing the applied voltage to control the tilt of the liquid crystal molecules.
  • the first optical compensation layer can suitably compensate for the axial misalignment of the polarizer of the polarizing plate.
  • the in-plane retardation Re of the first optical compensation layer is preferably 20 to 180 nm, more preferably 25 to 160 nm, still more preferably 30 to 140 nm.
  • the thickness direction retardation Rth of the first optical compensation layer is preferably 20 to 200 nm, more preferably 30 to; 180 nm, and still more preferably 40 to 150 nm.
  • the Nz coefficient of the first optical compensation layer is 1 or more, preferably 1.1 or more, and more preferably 1.3 or more.
  • the Nz coefficient of the first optical compensation layer is 2.5 or less, preferably 2.2 or less, more preferably 2.0 or less, and particularly preferably 1.8 or less. .
  • the effect of V can be obtained if the axial misalignment of the polarizer of the polarizing plate can be more preferably compensated.
  • the first optical compensation layer preferably 70 X 10- 12 (m 2 / N) or less, more preferably 60 X 10 - 12 (m 2 / N) or less, more preferably 50 X 10- 12 (m 2 / N) or less, still more preferably 40 X 10- 12 (m 2 / N) or less, particularly preferably photoelastic of 0 ⁇ 1 X 10- 12 ⁇ 30 X 10- 12 (m 2 / N) Has a coefficient.
  • the photoelastic coefficient is in the above range, the occurrence of phase difference unevenness due to tension at the time of bonding with another optical element can be suppressed, so that an effect of obtaining a liquid crystal panel in which light leakage is suppressed can be obtained. obtain.
  • the first optical compensation layer is also preferably Re (780) / Re (550)> 1.1, more preferably 1. K Re (780) / Re (550) ⁇ 1.6, more preferably Has the relationship 1.15 ⁇ Re (780) / Re (550X 1.5.
  • the retardation value is constant over a wide visible light region.
  • the first optical compensation layer is also preferably Re (550) / Re (380)> 1.1, more preferably 1. KRe (550) / Re (380) ⁇ 1. 7, more preferably 1.3 ⁇ Re (550) / Re (380X 1.6.
  • the first optical compensation layer has the above relationship. Since the phase difference value is constant over a wide visible light region, the wavelength of the liquid crystal display device in the oblique direction is less likely to cause a wavelength deviation in light leaking when used in a liquid crystal display device. In particular, when used in a liquid crystal display device, light leakage in the blue region can be reduced and the display image can be prevented from being bluish.
  • materials having a non-aromatic cyclic structure and an ester group are preferably substituted with an acetyl group and a propionyl group! /,
  • a cellulose-based material, and a polyester-based material having a non-aromatic cyclic structure are preferably substituted with an acetyl group and a propionyl group! /.
  • cellulosic materials substituted with acetyl groups and propionyl groups (hereinafter simply referred to as "cellulosic materials"), the degree of substitution with acetyl groups exists in the cell mouth repeating units. It can be shown by the “degree of substitution of acetyl (DSac)” which indicates how much the three hydroxyl groups on average are substituted by the acetyl group. In the cellulosic material, the degree of substitution with propionyl groups indicates the average amount of substitution by three hydroxyl group propionyl groups present in the repeating unit of cellulose! DSpr) ".
  • the degree of substitution with acetyl (DSac) and the degree of substitution with propylene (DSpr) can be determined by the methods described in JP 2003-315538 A. (0016) to (001 9).
  • the degree of acetyl substitution (DSac) and the degree of propionyl substitution (DSpr) preferably satisfy the relational expression of 2.0 ⁇ DSac + DSpr ⁇ 3.0.
  • the lower limit value of DSac + DSpr is preferably 2.3 or more, more preferably 2.6 or more.
  • the upper limit value of DSac + DSpr is preferably 2.9 or less, more preferably 2.8 or less.
  • the cellulosic material preferably has a propionyl substitution degree (DSpr) of 1.0 ⁇ D
  • the relational expression Spr ⁇ 3.0 is satisfied.
  • the lower limit of DSpr is preferably 2 or more, more preferably
  • the upper limit of DSpr is preferably 2.9 or less, more preferably 2.8 or less.
  • the cellulosic material may have a substituent other than the acetyl group and the propionyl group.
  • substituents include ester groups such as butyrate; ether groups such as alkyl ether groups and araalkylene ether groups;
  • the number average molecular weight of the cellulosic material is preferably 5,000 to 100,000, more preferably 10,000 to 70,000. By setting it within the above range, it is possible to obtain excellent mechanical strength and excellent mechanical strength.
  • any appropriate method is adopted.
  • cellulose is treated with a strong caustic soda solution to obtain alkali cellulose, which is acylated with a mixture of a predetermined amount of acetic anhydride and propionic anhydride.
  • the degree of substitution “DSac + DSpr” is adjusted by partially hydrolyzing the acyl group.
  • the optical film (polymer film) formed from the cellulosic material may include any appropriate polymer material.
  • a polymer material include senorelose esterol such as cellulose butyrate; senolen ether ether such as methinoresenorelose and ethinoresenorelose; and the like.
  • the film may contain additives such as a plasticizer, a heat stabilizer, and an ultraviolet stabilizer as necessary.
  • optical film formed by the above-described cellulose-based material strength examples include, for example, JP 2003
  • KA film manufactured by Kane force Co., Ltd.
  • polyester material obtained by polymerizing a dicarboxylic acid component having a non-aromatic cyclic structure and a diol component
  • a polyester resin having a non-aromatic cyclic structure and an ester group is preferably used.
  • a first optical compensation layer having the desired optical characteristics for example, refractive index ellipsoid, in-plane retardation, thickness direction retardation
  • any suitable stretching method such as a longitudinal uniaxial stretching method, a transverse uniaxial stretching method, a longitudinal and transverse simultaneous biaxial stretching method, and a longitudinal and transverse sequential biaxial stretching method may be employed.
  • the stretching direction may be the film longitudinal direction (MD direction) or the width direction (TD direction).
  • MD direction film longitudinal direction
  • TD direction width direction
  • the stretching direction is the width direction (TD direction)
  • it can be bonded to other optical elements in a roll shape with a roll-to-roll, and productivity can be greatly improved. It is advantageous for industrial production.
  • the stretching temperature is preferably 130. ⁇ ; 170 ° C, more preferably 140 ⁇ ; 150 ° C.
  • the draw ratio is preferably 1.5 to 2.5 times, more preferably 1.9 to 2.3 times.
  • the thickness of the extended finalem formed is preferably 30 to 70 ⁇ 111, more preferably 40 to 60 ⁇ 111.
  • the second optical compensation layer is a negative C plate having positive refractive index wavelength dispersion (positive dispersion).
  • the second optical compensation layer can suitably compensate for the birefringence of the liquid crystal cell (positive uniaxial birefringence having positive dispersion: positive C plate component).
  • the in-plane retardation Re of the second optical compensation layer is preferably 0 to
  • the thickness direction retardation Rth of the second optical compensation layer is preferably 20 nm or more, more preferably Is 30 to 160 nm, more preferably 70 to 160 nm. Rth is in the above range
  • Liquid crystal cell birefringence positive uniaxial birefringence with positive dispersion: positive
  • the second optical compensation layer is also preferably Re (780) / Re (550) ⁇ 0.95, more preferably
  • the retardation value is constant over a wide area of visible light
  • the amount of color shift in the oblique direction of the liquid crystal display device which is less likely to cause wavelength deviation in light leaking, is further increased. You can power down.
  • light leakage in the red region is reduced, and the display image can be prevented from becoming reddish.
  • the second optical compensation layer is also preferably Re (550) / Re (380) ⁇ 0.95, more preferably
  • the phase difference value is constant in a wide region of visible light. It is possible to further reduce the amount of color shift in the oblique direction of a liquid crystal display device, where wavelength deviation is unlikely to occur in leaking light, especially when used in a liquid crystal display device. It becomes small and it can prevent that a display image becomes bluish.
  • the second optical compensation layer for example, a polymer selected from the group consisting of polyamide, polyimide, polyester, poly (ether ketone), poly (amidoimide) and poly (ester imide) is optically transparent.
  • Polyamide, polyimide, polyester, poly (ether ketone), poly (amidoimide), or poly (ester imide) that can form the second optical compensation layer are excellent in heat resistance, chemical resistance, and transparency.
  • the polymers described in (0018) to (0072) of JP 2004-46065 Koyuki, et al. Among them, a soluble polyimide (for example, an aromatic dianhydride and a polyaromatic diamine, which has high transparency, high orientation, and high stretchability) JP-A-8-511812) can be preferably used.
  • the coating method is not particularly limited, and any method can be used.
  • a method of applying a polyimide solution dissolved in a solvent such as heated and melted polyimide or cyclohexanone to a PET film or the like with a thickness of 10 to 30 m can be used.
  • the obtained coating film is, for example, naturally dried (air-dried) or 80 to; heated at 120 ° C. for 8 to 12 minutes to solidify the polyimide on the film, whereby the second optical compensation layer is formed. Can be formed.
  • the thickness of the above optically transparent layer of the polymer is preferably 0.;! To 10 111, more preferably 1 to 5 mm. Therefore, the second optical compensation layer formed from the polymer favorably compensates for the birefringence of the liquid crystal cell and contributes to the thinning of the liquid crystal panel.
  • the layer in which the cholesteric alignment state of the nematic liquid crystal is fixed does not have coloration or the like in the visible light region. That is, it is preferable that the selectively reflected light of the cholesteric aligned liquid crystal is not in the visible region.
  • the selective reflection is uniquely determined by the cholesteric chiral pitch and the refractive index of the liquid crystal.
  • the value of the center wavelength of selective reflection may be in the near infrared region, but it is more preferable to be in the ultraviolet region of 350 nm or less in order to avoid the influence of optical rotation.
  • the above-described cholesteric alignment solidified layer is, for example, imparted to a cholesteric structure (spiral structure) by applying a twist with a chiral agent in a state where the liquid crystal material exhibits a liquid crystal phase, and in that state, a polymerization treatment or a crosslinking treatment.
  • a cholesteric structure spiral structure
  • a polymerization treatment or a crosslinking treatment By applying the above, the alignment (cholesteric structure) of the liquid crystal material can be fixed.
  • cholesteric alignment solidified layer examples include the cholesteric alignment solidified layer described in JP-A-2003-287623.
  • the thickness of the cholesteric alignment solidified layer is preferably 0.;! ⁇ LO ⁇ m, more preferably It is;! ⁇ 5 m. Therefore, the second optical compensation layer, which is a solidified cholesteric alignment layer, can favorably compensate for the birefringence of the liquid crystal cell and contribute to the thinning of the liquid crystal panel.
  • the layer in which the columnar alignment or nematic alignment state of the discotic liquid crystal is fixed is, for example, a discotic liquid crystal material having a negative uniaxial property such as a phthalocyanine or a triphenylene compound having a molecular extension in the plane. Further, it can be formed by developing a columnar phase or a nematic phase. Specifically, for example, a layer in which the columnar orientation of the discotic liquid crystal is fixed can be obtained by the method described in JP-A-9-117983.
  • the layer in which the negative uniaxial crystal is oriented in the plane for example, those described in JP-A-6-82777 can be used.
  • Examples of the layer composed of a biaxially oriented polymer film include, for example, a method of biaxially stretching a polymer film having positive refractive index anisotropy in a balanced manner, a method of pressing a thermoplastic resin, and parallel orientation. And a polymer film formed by a method of cutting out from the obtained crystal.
  • Examples of a method for biaxially stretching a polymer film having positive refractive index anisotropy in a balanced manner include the ability to simultaneously or sequentially biaxially stretch a film made of a norbornene-based resin under the following conditions. . That is, preferably 120 to; 180 ° C, more preferably 130 to; 170 ° C, stretching temperature, preferably 1.2 to 3 times, more preferably 1.5 to 2.5 times the longitudinal stretching ratio, preferably Is a method of drawing at a transverse draw ratio of 1.2 to 3 times, more preferably 1.5 to 2.5 times.
  • the third optical compensation layer has negative refractive index wavelength dispersion (reverse dispersion).
  • the third optical compensation layer can suitably compensate for the axial misalignment of the polarizer of the polarizing plate.
  • the third optical compensation layer may be the same as or different from the first optical compensation layer.
  • the third optical compensation layer is formed of the same material as the first optical compensation layer and has the same thickness as the first optical compensation layer.
  • the fourth optical compensation layer is a negative C plate having positive refractive index wavelength dispersion (positive dispersion).
  • the fourth optical compensation layer can suitably compensate for the birefringence of the liquid crystal cell (positive uniaxial birefringence having positive dispersion: positive C plate component).
  • the fourth optical compensation layer may be the same as or different from the second optical compensation layer.
  • the fourth optical compensation layer is formed of the same material as the second optical compensation layer and has the same thickness as the second optical compensation layer.
  • any appropriate polarizer may be adopted as the polarizer depending on the purpose.
  • dichroic substances such as iodine and dichroic dyes may be added to hydrophilic polymer films such as polyalcohol-based films, partially formalized polybulal alcohol-based films, and ethylene.butyral acetate copolymer-based partially saponified films.
  • hydrophilic polymer films such as polyalcohol-based films, partially formalized polybulal alcohol-based films, and ethylene.butyral acetate copolymer-based partially saponified films.
  • Polyethylene-based oriented films such as those that have been adsorbed and uniaxially stretched, polyvural alcohol dehydrated products, and polychlorinated bull dehydrochlorinated products.
  • a polarizer obtained by adsorbing a dichroic substance such as iodine on a polybulualcohol-based film and uniaxially stretching is particularly preferable because of its high polarization dichroic ratio.
  • the thickness of these polarizers is not particularly limited, but is generally about !!-80 m.
  • a polarizer uniaxially stretched by adsorbing iodine to a polybulualcohol-based film is dyed by immersing polybulualcohol in an aqueous iodine solution and stretched 3 to 7 times the original length. It is possible to produce with S. If necessary, it may contain boric acid, zinc sulfate, zinc chloride or the like, or may be immersed in an aqueous solution of potassium iodide or the like. Furthermore, if necessary, the polybulal alcohol film may be immersed in water and washed before dyeing.
  • the polybulal alcohol-based film Swelling of the surface of the surface and anti-blocking agent as well as swelling of the polybulal alcohol film has the effect of preventing unevenness such as uneven dyeing.
  • the stretching may be performed after dyeing with iodine, may be performed while dyeing, or may be performed after being stretched and then dyed with iodine. Stretch with force S in an aqueous solution of boric acid or potassium iodide or in a water bath.
  • any appropriate film that can be used as a protective layer of a polarizer can be adopted.
  • the material that is the main component of such a film include cellulose resins such as triacetyl cellulose mouth (TAC), polyester, polybutyl alcohol, polycarbonate, polyamide, polyimide, and poly Examples thereof include transparent resins such as ether sulfone, polysulfone, polystyrene, polynorbornene, polyolefin, acrylic, and acetate.
  • thermosetting resins such as acrylic, urethane, acrylic urethane, epoxy, and silicone, or ultraviolet curable resins, and the like are also included.
  • a glassy polymer such as a siloxane polymer is also included.
  • JP 2001-343529 Koyuki WO01 / 37007 can also use the polymer phenol described in this document.
  • the material of the film include a thermoplastic resin having a substituted or unsubstituted imide group in the side chain, and A resin composition containing a thermoplastic resin having a substituted or unsubstituted phenyl group and nitrile group in the side chain can be used.
  • an alternating copolymer of isobutene and N-methylmaleimide and an acrylonitrile / styrene copolymer are used.
  • the polymer film can be, for example, an extrusion-molded product of the resin composition, such as TAC, polyimide resin, polybutyl alcohol resin, and glassy polymer. TAC is more preferable.
  • the protective layer is preferably transparent and has no color.
  • the protective layer preferably has substantially optical isotropy.
  • the in-plane retardation of the protective layer is 0 to 10 nm, and the thickness direction retardation is 0 to 10 nm.
  • the thickness of the protective layer is preferably 5 mm or less, more preferably 1 mm or less, and even more preferably. Preferably, it is! -500 ⁇ m, and even more preferably 5--150 ⁇ m.
  • the protective layer provided on the outer side (opposite side of the optical compensation layer) of the polarizer may be subjected to a hard coat treatment, an antireflection treatment, an anti-sticking treatment, an antiglare treatment, or the like as necessary.
  • Arbitrary appropriate adhesives can be employ
  • Specific examples include a solvent-type pressure-sensitive adhesive, a non-aqueous emulsion type pressure-sensitive adhesive, a water-based pressure-sensitive adhesive, and a hot melt pressure-sensitive adhesive.
  • a solvent-type pressure-sensitive adhesive having an acrylic polymer as a base polymer is preferably used.
  • the thickness of the pressure-sensitive adhesive layer can be appropriately set according to the purpose of use, adhesive strength and the like. Specifically, the thickness of the pressure-sensitive adhesive layer is preferably 1 Hm to 100 ⁇ m, more preferably 5 ⁇ m to 50 ⁇ m, and even more preferably 10 ⁇ m to 30 ⁇ m.
  • a typical example of the adhesive that forms the adhesive layer is a curable adhesive.
  • Typical examples of the curable adhesive include a photocurable adhesive such as an ultraviolet curable adhesive, a moisture curable adhesive, and a thermosetting adhesive.
  • the amount of adhesive applied to each layer can be appropriately set according to the purpose.
  • the coating amount is preferably 0.3 to 3 ml, more preferably 0.5 per area (cm 2 ) with respect to the main surface of each layer.
  • the solvent contained in the adhesive is volatilized by natural drying or heat drying.
  • the thickness of the adhesive layer thus obtained is preferably 0.;! To 20 m, more preferably 0. ⁇ - ⁇ , ⁇ , and still more preferably ;! to 10 m.
  • the pressure-sensitive adhesive or adhesive may be appropriately selected depending on the type of adherend (optical element).
  • the liquid crystal panel of the present invention may further include other optical elements.
  • another optical element any appropriate optical element can be adopted depending on the purpose and the type of the liquid crystal display device. Specific examples include liquid crystal films, light scattering films, diffraction films, and Another optical compensation layer (retardation film) and the like can be mentioned.
  • the liquid crystal panel of the present invention for example, the optical elements can be force s is prepared by laminating by via an adhesive layer or an adhesive layer described above. Any appropriate means can be adopted as the lamination means.
  • the first optical compensation layer (third optical compensation layer), the second optical compensation layer (fourth optical compensation layer), and a polarizer are punched out to a predetermined size, and the angle formed by the optical axis of each layer is The directions can be adjusted so as to be within a desired range, and they can be laminated on the liquid crystal cell via an adhesive or an adhesive.
  • the second optical compensation layer (fourth optical compensation layer) can be directly formed on an adjacent layer, for example, a substrate functioning as a first optical compensation layer, a polarizer or a protective layer. In this case, the pressure-sensitive adhesive layer or adhesive layer for laminating these layers becomes unnecessary, which can contribute to thinning of the liquid crystal panel and simplification of the laminating operation.
  • the liquid crystal panel of the present invention can be used in a liquid crystal display device.
  • Liquid crystal display devices are, for example, office equipment such as laptop monitors, notebook computers, and copy machines; mobile devices such as mobile phones, watches, digital cameras, personal digital assistants (PDAs), and portable game machines; video cameras, liquid crystal televisions, and the like. Electrical equipment for home use such as microwave ovens; Back monitors, monitors for car navigation systems, in-car devices such as car audio; monitors for information for commercial stores; first-class display equipment; security equipment such as monitoring monitors; Suitable for nursing care and medical equipment such as monitors and medical monitors.
  • a film obtained by stretching a KA film (manufactured by KANEKI Co., Ltd., thickness: 80 m) twice at 150 ° C. at the fixed end was used as a first optical compensation layer.
  • the phase difference of the obtained film was measured using a phase difference measuring apparatus (manufactured by Oji Scientific Instruments Co., Ltd., KOBRA21ADH)
  • the refractive index wavelength dispersion of the film is shown in FIG. Fig. 3 is a graph drawn using Koshii's approximate expression. is there.
  • the power was OOnm.
  • the refractive index wavelength dispersion of the film is shown in FIG.
  • the third optical compensation layer and the fourth optical compensation layer were the same as the first optical compensation layer and the second optical compensation layer, respectively.
  • a polarizing plate manufactured by Nitto Denko Corporation, product number: SIG1423DU was used as the polarizer.
  • the second optical compensation layer (fourth optical compensation layer) was transferred from the PET film onto the polarizing plate via an acrylic adhesive (thickness: 20 m).
  • the first optical compensation layer (third optical compensation layer) is passed through an acrylic adhesive (thickness: 20 m) so that its slow axis is perpendicular to the absorption axis of the polarizer of the polarizing plate.
  • laminated on the second optical compensation layer (fourth optical compensation layer) to obtain two polarizing plates with an optical compensation layer.
  • the two polarizing plates with an optical compensation layer obtained were taken out of a liquid crystal television (manufactured by Sony Corporation, BRAVIA S2000 (32 inches)) on both sides of a VA mode liquid crystal cell.
  • a liquid crystal panel was fabricated by pasting so as to be orthogonal.
  • White and black images are displayed on the liquid crystal display device incorporating the obtained liquid crystal panel, and contrast and color shift (the polar angle in the azimuth angle 45 ° direction is 0 to 80 ° by EZ Contrast (manufactured by ELDIM)).
  • the color shift when tilted and the color shift when the azimuth was changed from 0 to 360 ° at a polar angle of 60 ° were measured. The results are shown in Fig. 4. [0095] [Example 2]
  • a film manufactured in the same manner as in Example 1 (Re: 36 nm, Rth: 50 nm, Nz coefficient: 1.4) was used as the first optical compensation layer.
  • a cyclohexanone solution (15 wt%) of polyimide prepared in the same manner as in Example 1 was applied on the first optical compensation layer to a thickness of 20 m.
  • a laminated film in which the second optical compensation layer (polyimide film, thickness: about 3111) was laminated on the first optical compensation layer was obtained.
  • the phase difference of the obtained laminated film was measured using a phase difference measuring device (manufactured by Oji Scientific Instruments Co., Ltd., KOBRA21ADH), it was found to be: e 35 mm, th force 155 im.
  • the third optical compensation layer and the fourth optical compensation layer were the same as the first optical compensation layer and the second optical compensation layer, respectively.
  • the same polarizer as in Example 1 was used as the polarizer.
  • the laminated film is placed so that the second optical compensation layer (fourth optical compensation layer) faces the polarizing plate, the polarizer's absorption axis of the polarizing plate, and the first optical compensation layer (third optical compensation layer).
  • the optical compensation layer was laminated on a polarizing plate via an acrylic pressure-sensitive adhesive (thickness: 20 m) so that the slow axis of the optical compensation layer was perpendicular to each other to obtain two polarizing plates with an optical compensation layer.
  • a liquid crystal panel was produced in the same manner as in Example 1, and the contrast and color shift were measured. The results are shown in FIG.
  • the second optical compensation layer (fourth optical compensation layer) and the polarizing plate are facing each other.
  • PVA adhesive thickness: 0.5
  • the absorption axis of the polarizer of the polarizing plate and the slow axis of the first optical compensation layer (third optical compensation layer) are perpendicular to each other. m) through.
  • the retardation of the obtained film was measured, the Re force Onm and Rth were
  • Re was 0.3 nm
  • Rth was
  • the third optical compensation layer and the fourth optical compensation layer were the same as the first optical compensation layer and the second optical compensation layer, respectively.
  • the same polarizer as in Example 1 was used as the polarizer.
  • a liquid crystal panel was produced in the same manner as in Example 1, and the contrast and color shift were measured. The results are shown in FIG.
  • a film produced in the same manner as in Example 4 (Re: 0.3 nm, Rth: 80 nm, thickness: about 2.5 ⁇
  • the third optical compensation layer and the fourth optical compensation layer were the same as the first optical compensation layer and the second optical compensation layer, respectively.
  • the same polarizer as in Example 1 was used as the polarizer.
  • a liquid crystal panel was produced in the same manner as in Example 1, and the contrast and color shift were measured. The results are shown in FIG.
  • a film obtained by stretching the film (thickness: 150 m) formed by this polyester resin strength twice at 135 ° C. twice at a fixed end was used as a first optical compensation layer.
  • the refractive index wavelength dispersion of the obtained film is shown in FIG. 3 (C) together with the refractive index wavelength dispersion of the first optical compensation layer used in Example 1.
  • the third optical compensation layer and the fourth optical compensation layer were the same as the first optical compensation layer and the second optical compensation layer, respectively.
  • the same polarizer as in Example 1 was used as the polarizer.
  • a liquid crystal panel was produced in the same manner as in Example 1.
  • the contrast and color shift of this liquid crystal panel were measured in the same manner as in Example 1, the same contrast and color shift as in FIG. One shift is obtained.
  • a film produced in the same manner as in Example 4 (Re: 0.3 nm, Rth: 80 nm, thickness: about 2.5 ⁇
  • the third optical compensation layer and the fourth optical compensation layer were the same as the first optical compensation layer and the second optical compensation layer, respectively.
  • the same polarizer as in Example 1 was used as the polarizer.
  • a liquid crystal panel was produced in the same manner as in Example 1.
  • the contrast and color shift of this liquid crystal panel are measured in the same manner as in Example 1, the same contrast and color shift as in FIG. 7 can be obtained.
  • a liquid crystal panel was prepared by pasting the liquid crystal cell on both sides of the same liquid crystal cell as in Example 1 so as to be orthogonal. Subsequently, the contrast and color shift were measured in the same manner as in Example 1. The results are shown in FIG.
  • a polarizing plate with an optical compensation layer To obtain a polarizing plate with an optical compensation layer.
  • the obtained polarizing plate with an optical compensation layer and a polarizing plate (manufactured by Nitto Denko Corporation, SEG1224) are attached to both sides of the same liquid crystal cell as in Example 1 so that the absorption axes of the polarizers are orthogonal to each other.
  • a liquid crystal panel was produced.
  • a polarizing plate with an optical compensation layer was attached to the backlight side.
  • the contrast and color shift were measured in the same manner as in Example 1. The result is shown in FIG.
  • Retardation film NTAC (Re: 45 nm, Rth: 145 nm, thickness: 80 ⁇ m, Nz coefficient: 3.2) manufactured by Konica Minolta, Inc., whose slow axis is orthogonal to the absorption axis of the polarizer of the polarizer
  • a polarizing plate SE G1224, manufactured by Nitto Denko Corporation
  • the obtained two polarizing plates with an optical compensation layer were attached to both sides of the same liquid crystal cell as in Example 1 so that the absorption axes of the polarizers were orthogonal to each other to produce a liquid crystal panel.
  • contrast and color shift were measured. The results are shown in FIG.
  • the refractive index wavelength dispersion of the norbornene-based resin film was so-called flat wavelength dispersion as shown in FIG.
  • the obtained two polarizing plates with an optical compensation layer were prepared so that the retardation film made of a norbornene-based resin was opposed to the liquid crystal cell and the absorption axes of the polarizers were orthogonal to each other.
  • a liquid crystal panel was prepared by sticking to both sides of the same liquid crystal cell.
  • the contrast and color shift were measured in the same manner as in Example 1 (because a lot of unevenness was observed on the screen, light was lost! Measured at points). The results are shown in FIG.
  • Z-TAC film made by Fuji Film Co., Ltd., film thickness: 80 m
  • PET film which has substantially optical isotropy
  • cyclohexanone solution of polyimide 15 wt%)
  • a polyimide film (thickness: about 2.5 111) was laminated on the Z-TAC film in the same manner as the method for producing the second optical compensation layer in Example 1 except that the coating thickness was set to 16 m.
  • a film was obtained.
  • the retardation of the obtained laminated film was measured, the Re force was nm and the Rth force was SlOOnm.
  • the laminated film obtained in this manner was so arranged that the Z-TAC film layer was opposite to the polarizing plate (manufactured by Nitto Denko Corporation, SIG1423DU), and the slow axis of the stretched polyimide film and the polarizer absorption of the polarizing plate
  • Two polarizing plates with an optical compensation layer were obtained by laminating with an acrylic pressure-sensitive adhesive (thickness: 20 m) so that the axis was orthogonal.
  • the obtained two polarizing plates with an optical compensation layer were attached to both sides of the same liquid crystal cell as in Example 1 so that the absorption axes of the polarizers were orthogonal to each other, thereby producing a liquid crystal panel.
  • the contrast and color shift were measured in the same manner as in Example 1. The results are shown in FIG.
  • the obtained phase difference film was laminated on a polarizing plate (manufactured by Nitto Denko Corporation, SEG1224) via an acrylic pressure-sensitive adhesive (thickness: 20 m) to obtain polarizing plate 1 with an optical compensation layer.
  • a polycarbonate resin film having a negative refractive index wavelength dispersion (reverse dispersion) (manufactured by Teijin Chemicals Ltd., Pure Ace, Re: 145 nm, Rth: 141 nm, thickness: 77 111, Nz coefficient: 1 ⁇ 0)
  • the polarizing plate 2 with an optical compensation layer was obtained by laminating with an acrylic pressure-sensitive adhesive (thickness: 20 ⁇ ) so that the slow axis and the absorption axis of the polarizer of the polarizing plate were orthogonal to each other.
  • the polarizing plates 1 and 2 with optical compensation layers were attached to both sides of the same liquid crystal cell as in Example 1 so that the absorption axes of the polarizers were orthogonal to each other, thereby producing a liquid crystal panel.
  • the polarizing plate 1 with an optical compensation layer was attached to the backlight side.
  • the contrast and the color shift were measured in the same manner as in Example 1. The results are shown in FIG.
  • a retardation film 1 (Re: 0.2 nm, Rt h: lOOnm) produced in the same manner as the second optical compensation layer of Example 1 was bonded to a polarizing plate (Nitto) via an acrylic adhesive (thickness: 20 m). The film was transferred from PET film onto Denko Corporation, product number: SIG1423DU).
  • a retardation film 2 (Re: 36 nm, Rth: 50 nm, Nz coefficient: 1 ⁇ 4) produced in the same manner as the first optical compensation layer of Example 1, and the slow axis of the polarizer of the polarizing plate
  • a polarizing plate 3 with an optical compensation layer was obtained by being laminated on the retardation film 1 via an talyl-based adhesive (thickness: 20 m) so as to be orthogonal to the absorption axis.
  • the above retardation film 2 is coated with a polarizing plate (manufactured by Nitto Denko Corporation) through an acrylic adhesive (thickness: 20 m) so that its slow axis is orthogonal to the absorption axis of the polarizer of the polarizing plate. And product number: SIG1423DU).
  • the retardation film 1 was laminated (transferred) onto the retardation film 2 via an acrylic pressure-sensitive adhesive (thickness: 20, im) to obtain a polarizing plate 4 with an optical compensation layer.
  • a liquid crystal panel was produced by pasting the obtained polarizing plates 3 and 4 with an optical compensation layer on both sides of the same liquid crystal cell as in Example 1 so that the absorption axes of the polarizers were orthogonal to each other. .
  • the polarizing plate 4 with an optical compensation layer was attached to the backlight side. Subsequently, the contrast and color shift were measured in the same manner as in Example 1. The results are shown in FIG. [0128] [Comparative Example 8]
  • Tables 1 and 2 show the outline of the configuration of the liquid crystal panels produced in Examples 1 to 7 and Comparative Examples 1 to 8.
  • the contrast viewing angle characteristics are remarkably improved.
  • the points on the chromaticity diagram indicate that the smaller the movement distance, the smaller the color shift. Therefore, as shown in the xy chromaticity diagrams of Figs. 4 to 14, the liquid crystal panel of Examples;! To 5 is the color when the polar angle is tilted from 0 to 80 ° in the direction of 45 ° azimuth.
  • the shift is also significantly suppressed compared with the liquid crystal panels of Comparative Examples 1 to 6!
  • the smaller the (X, y) amplitude is, the smaller the power error shift is.
  • the liquid crystal panels of Examples 1 to 5 change the azimuth angle from 0 to 360 ° at a polar angle of 60 °. It can be seen that the color shift is significantly suppressed compared to the liquid crystal panels of Comparative Examples;!
  • the liquid crystal panel of Comparative Example 6 has a small amplitude in the azimuth angle dependency of the X value and the y value, but the X value curve and the y value curve intersect each other many times. Since the liquid crystal panel having such characteristics varies greatly in color depending on the viewing angle, it gives a viewer a very uncomfortable feeling.
  • the liquid crystal panel of the example of the present invention is superior in both contrast and color shift compared to the liquid crystal panel of the comparative example.
  • the screens during black display in the liquid crystal display device manufactured in Example 1 and the liquid crystal display device manufactured in Comparative Example 6 were photographed.
  • the photograph is shown in FIG.
  • the liquid crystal display device of Example 1 shows no unevenness (light leakage)
  • the liquid crystal display device of Comparative Example 6 shows unevenness on the entire screen and is not at a practical level. I understand.
  • the unevenness observed in Comparative Example 6 is the retardation unevenness due to the tension at the time of laminating each optical element, and is considered to be caused by the large photoelastic coefficient of the used retardation film.
  • the liquid crystal panel of the present invention contributes to thinning, improves viewing angle characteristics, achieves high contrast, suppresses color shift, and can favorably prevent light leakage in black display.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Liquid Crystal (AREA)
  • Polarising Elements (AREA)

Abstract

L'invention concerne un panneau à cristaux liquides et un dispositif d'affichage à cristaux liquides qui contribuent à la miniaturisation, réalisent un contraste élevé avec une amélioration d'une caractéristique d'angle de visualisation, suppriment un changement de couleur et peut bien empêcher une fuite de lumière au niveau d'un affichage noir. Le panneau à cristaux liquides est composé d'une cellule à cristaux liquides, d'une première à une quatrième couches de compensation optique et de premier et second polariseurs. La première couche de compensation optique disposée sur un côté de la cellule à cristaux liquides a les relations suivantes : Nz = 1-2,5 et Re1 (380) < Re1 (550) < Re1 (780) et la seconde couche de compensation optique a les relations suivantes : nx = ny > nz et Re2(380) > Re2 (550) > Re2 (780). La troisième couche de compensation optique disposée sur l'autre côté de la cellule à cristaux liquides a les relations suivantes : Nz = 1-2,5 et Re3 (380) < Re3 (550) < Re3 (780) et la quatrième couche de compensation optique a les relations suivantes : nx = ny > nz et Re4 (380) > Re4 (550) > Re4 (780). Les première et seconde couches de compensation optique et les troisième et quatrième couches de compensation optique sont symétriques en position par rapport à la cellule à cristaux liquides.
PCT/JP2007/072176 2006-11-27 2007-11-15 Panneau à cristaux liquides et dispositif d'affichage à cristaux liquides Ceased WO2008065899A1 (fr)

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JP2007-149328 2007-06-05
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JP2007265642A JP2009015279A (ja) 2006-11-27 2007-10-11 液晶パネルおよび液晶表示装置

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Cited By (1)

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WO2019194111A1 (fr) * 2018-04-04 2019-10-10 大阪ガスケミカル株式会社 Polymère pour film de retard, film de retard, et procédé de fabrication et utilisation associés

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JP2002182036A (ja) * 2000-04-06 2002-06-26 Fujitsu Ltd 視角補償フィルム及び液晶表示装置
JP2004035688A (ja) * 2002-07-02 2004-02-05 Tomoegawa Paper Co Ltd 電子部品用接着剤および電子部品用接着テープ
JP2005521920A (ja) * 2002-04-04 2005-07-21 サムスン　エレクトロニクス　カンパニー　リミテッド 補償フィルムを備えた液晶表示装置

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Publication number Priority date Publication date Assignee Title
JP2002182036A (ja) * 2000-04-06 2002-06-26 Fujitsu Ltd 視角補償フィルム及び液晶表示装置
JP2005521920A (ja) * 2002-04-04 2005-07-21 サムスン　エレクトロニクス　カンパニー　リミテッド 補償フィルムを備えた液晶表示装置
JP2004035688A (ja) * 2002-07-02 2004-02-05 Tomoegawa Paper Co Ltd 電子部品用接着剤および電子部品用接着テープ

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019194111A1 (fr) * 2018-04-04 2019-10-10 大阪ガスケミカル株式会社 Polymère pour film de retard, film de retard, et procédé de fabrication et utilisation associés
JPWO2019194111A1 (ja) * 2018-04-04 2021-05-13 大阪ガスケミカル株式会社 位相差フィルム用ポリマー、位相差フィルムならびにその製造方法および用途
JP7377794B2 (ja) 2018-04-04 2023-11-10 大阪ガスケミカル株式会社 位相差フィルム用ポリマー、位相差フィルムならびにその製造方法および用途

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