WO2007122941A1 - 液晶パネルおよび液晶表示装置 - Google Patents
液晶パネルおよび液晶表示装置 Download PDFInfo
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- WO2007122941A1 WO2007122941A1 PCT/JP2007/055618 JP2007055618W WO2007122941A1 WO 2007122941 A1 WO2007122941 A1 WO 2007122941A1 JP 2007055618 W JP2007055618 W JP 2007055618W WO 2007122941 A1 WO2007122941 A1 WO 2007122941A1
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- Prior art keywords
- liquid crystal
- polarizing plate
- polarizer
- meth
- protective layer
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
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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
- G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
- G02B5/3033—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/133528—Polarisers
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/28—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising
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 a polarizing plate with an adjusted dimensional change rate.
- Liquid crystal display devices are used in personal computers and televisions.
- LCDs liquid crystal display devices used for these applications have been increasing in screen size.
- the LCD usually uses a liquid crystal panel in which polarizing plates are arranged on both sides of the liquid crystal cell.
- polarizing plates are arranged on both sides of the liquid crystal cell.
- Patent Documents a black image can be displayed when no voltage is applied.
- the conventional liquid crystal panel has a problem that light is leaked from the periphery of the screen when a black image is displayed when an acceleration test is performed in a high humidity environment. Such a problem becomes more conspicuous as the screen becomes larger. For this reason, it is hoped that this problem will be solved.
- Patent Document 1 Japanese Patent Laid-Open No. 9-269504
- the present invention has been made to solve the above-described problems, and an object of the present invention is to provide a liquid crystal panel excellent in display uniformity in which light leakage generated from the periphery of the screen is small in a high-humidity environment.
- a liquid crystal display device is provided.
- the present inventors have suppressed the warpage of the liquid crystal cell on the assumption that the cause of the light leakage in the high humidity environment of the liquid crystal display device using the conventional liquid crystal panel is the warpage of the liquid crystal cell.
- polarizing plates having such a dimensional change rate are arranged on both sides of the liquid crystal cell, it has been found that a liquid crystal panel and a liquid crystal display device with excellent display uniformity can be provided.
- the liquid crystal panel of the present invention includes a liquid crystal cell, a first polarizing plate disposed on the viewing side of the liquid crystal cell, and a second polarizing plate disposed on the side opposite to the viewing side of the liquid crystal cell. And the first The dimensional change rate (C) of the polarizing plate is larger than the dimensional change rate (C) of the second polarizing plate.
- the liquid crystal cell is provided with a liquid crystal layer, a first substrate disposed on one side of the liquid crystal layer, and on the other side of the liquid crystal layer.
- a pixel electrode and a common electrode are formed on the first substrate or the second substrate.
- the dimensional change rate (C) of the first polarizing plate is 0.03% to 0.20%.
- the dimensional change rate (C) of the second polarizing plate is 0.01%
- the difference (AW-W-W) from the moisture content (W) of the plate is 0.1% to 0.5%.
- the first polarizing plate includes a first polarizer, a first protective layer disposed on the liquid crystal cell side of the first polarizer, and the first polarizer.
- a second protective layer disposed on the opposite side of the polarizer from the liquid crystal cell side. This first protective layer is substantially optically isotropic.
- the liquid crystal panel further includes a surface treatment layer on the side of the second protective layer opposite to the first polarizer.
- the second polarizing plate includes a second polarizer, a third protective layer disposed on the liquid crystal cell side of the second polarizer, and the second polarizer.
- a fourth protective layer disposed on the opposite side of the polarizer from the liquid crystal cell side. This third protective layer is substantially optically isotropic.
- the liquid crystal panel further includes a first pressure-sensitive adhesive layer between the liquid crystal cell and the first polarizing plate.
- the liquid crystal panel further includes a second pressure-sensitive adhesive layer between the liquid crystal cell and the second polarizing plate.
- the first pressure-sensitive adhesive layer and the Z or the second pressure-sensitive adhesive layer include a pressure-sensitive adhesive containing a (meth) acrylic polymer (A) and a peroxide (B). Hanging composition It is formed as a bridge.
- a liquid crystal display device includes the liquid crystal panel described above.
- the liquid crystal panel of the present invention can reduce light leakage generated at the periphery of the screen by / J in a high humidity environment.
- FIG. 1 is a schematic cross-sectional view of a liquid crystal panel according to a preferred embodiment of the present invention.
- FIG. 2 is a schematic diagram showing the concept of a typical production process of a polarizer used in the present invention.
- FIG. 3 is a schematic diagram showing the concept of a typical production process for the pressure-sensitive adhesive layer used in the present invention.
- FIG. 4 is a schematic sectional view of a liquid crystal display device according to a preferred embodiment of the present invention.
- FIG. 5 (a) is an observation photograph of the liquid crystal display device of Example 1 of the present invention when displaying a black image, and (b) is an observation photograph of the liquid crystal display device of Comparative Example 1 when displaying a black image. .
- FIG. 6 (a) is a graph showing the color shift measurement result of the liquid crystal display device of Example 1 of the present invention, and (b) is the color shift measurement result of the liquid crystal display device of Reference Example 1. It is a graph.
- Nx is the refractive index in the direction where the in-plane refractive index is maximum (ie, the slow axis direction), and “ny” is the refractive index in the direction perpendicular to the slow axis in the plane, “nz "Is the refractive index in the thickness direction.
- the retardation in the thickness direction is the retardation value in the thickness direction of the film at a wavelength ⁇ (nm) at 23 ° C.
- FIG. 1 is a schematic cross-sectional view of a liquid crystal panel according to one embodiment of the present invention.
- the liquid crystal panel 100 includes a liquid crystal cell 10, a first polarizing plate 21 disposed on the viewing side of the liquid crystal cell 10, and a second polarizing plate 22 disposed on the side opposite to the viewing side of the liquid crystal cell 10. Is provided.
- the dimensional change rate (C) of the first polarizing plate is larger than the dimensional change rate (C) of the second polarizing plate.
- Such a liquid crystal panel can effectively suppress the warpage of the liquid crystal cell when the liquid crystal cell is concavely curved toward the viewing side in a high humidity environment. As a result, it is possible to obtain a liquid crystal display device excellent in display uniformity in which light leakage generated at the periphery of the screen is small.
- the first polarizing plate 21 includes the first polarizer 1, the first protective layer 2 disposed on the liquid crystal cell 10 side of the first polarizer 1, and the first polarizer. 1 and a second protective layer 3 disposed on the opposite side of the liquid crystal cell 10 side.
- the second polarizing plate 22 includes the second polarizer 4, the third protective layer 5 disposed on the liquid crystal cell 10 side of the second polarizer 4, and the liquid crystal of the second polarizer 4.
- a fourth protective layer 6 disposed on the side opposite to the cell 10.
- the liquid crystal panel 100 includes a first pressure-sensitive adhesive layer 31 between the liquid crystal cell 10 and the first polarizing plate 21, and between the liquid crystal cell 10 and the second polarizing plate 22, A second pressure-sensitive adhesive layer 32 is provided.
- the absorption axis of the first polarizer 1 and the absorption axis of the second polarizer 4 are substantially orthogonal.
- substantially orthogonal includes a range in which the angle formed by the absorption axis of the first polarizer 1 and the absorption axis of the second polarizer 4 is 90 ° ⁇ 2.0 °. Preferably, it is 90 ° ⁇ 1.0 °.
- liquid crystal cell any appropriate liquid crystal cell may be employed as the liquid crystal cell used in the present invention.
- the liquid crystal cell include an active matrix type using a thin film transistor and a simple matrix type typified by a superpart is nematic liquid crystal display device.
- the liquid crystal cell includes a liquid crystal layer, a first substrate disposed on one side of the liquid crystal layer, and a second substrate disposed on the other side of the liquid crystal layer, A pixel electrode and a counter electrode for applying a voltage to the liquid crystal layer are formed on the first substrate or the second substrate.
- the liquid crystal cell has a structure in which liquid crystal is sealed between a substrate on which an electrode is formed and a substrate on which no electrode is formed. The present inventors have found that such a liquid crystal cell has a strong tendency to bend in a concave shape toward the viewing side in a high humidity environment. Therefore, a liquid crystal display device having a relatively large dimensional change rate and having a polarizing plate disposed on the viewing side of the liquid crystal panel to reduce light leakage generated at the peripheral portion of the screen and excellent display uniformity. Can be obtained.
- liquid crystal cell having the above-described structure include an in-plane switching (IPS) mode, a fringe field switching (FFS) mode, and the like according to the classification according to the driving mode.
- the IPS mode and FFS mode may be those using V-shaped electrodes or zigzag electrodes, respectively.
- Commercially available liquid crystal display devices that employ liquid crystal cells having the above structure include, for example, Hitachi, Ltd. 20V wide-screen LCD TV product name “Wooo” and Iama Corporation 19-inch liquid crystal display product name “ProLite E481S — 1 ”, 17-inch TFT liquid crystal display manufactured by Nanao Corporation“ FlexScan L565 ”and so on.
- polarizing plate refers to a material that converts natural light or polarized light into linearly polarized light, elliptically polarized light, or circularly polarized light.
- the thickness of the polarizing plate is not particularly limited, and includes the general concept of a thin film, a film, and a sheet.
- the thickness of the polarizing plate is preferably 1 ⁇ to 250 / ⁇ m, more preferably ⁇ to 250 / ⁇ m. By setting the thickness of the polarizing plate in the above range, a material having excellent mechanical strength can be obtained.
- the polarizing plate may be a laminate having a plurality of layers which may be composed of a single layer having a polarizing function (also referred to as a polarizer).
- a polarizing function also referred to as a polarizer.
- typical examples of the laminate structure include (a) a configuration including a polarizer and a protective layer (for example, the configuration shown in FIG. 1); (b) a polarizer, a protective layer, and a surface treatment. (C) a configuration including a polarizer, a protective layer, and a retardation layer (so-called retardation layer polarizing plate); (d) two or more layers Examples include a configuration including the above polarizer.
- the polarizing plate may have both a retardation layer and a surface treatment layer, or may have two or more retardation layers and Z or a surface treatment layer. Alternatively, in the polarizing plate, the retardation layer may also serve as a protective layer.
- the above dimensional change rate of the first polarizing plate (C) is preferably 0.03% to 0. And 20%, preferably ⁇ Furthermore or 0.06 0/0 to 0. Or 18 0/0 , and particularly preferably ⁇ or 0.09 0/0 to 0.16 0/0, the most Also preferably, it is 0.11% to 0.14%.
- the dimensional change rate (C) of the second polarizing plate is preferably 0.01% to 0.18%.
- a liquid crystal display device excellent in layer and display uniformity can be obtained.
- the polarizing plate used in the liquid crystal panel of the present invention can be obtained by, for example, selecting commercially available polarizing plates having different dimensional change rates and combining them appropriately.
- the polarizing plate used in the liquid crystal panel of the present invention can be obtained by adjusting the dimensional change rate by subjecting a commercially available polarizing plate to any treatment for increasing or decreasing the dimensional change rate.
- the liquid crystal panel of the present invention is a commercially available polarizing plate, and two commercially available polarizing plates having the same dimensional change rate are prepared. It can be obtained by using a plate that has been subjected to a treatment for increasing the dimensional change rate and using a commercially available product as it is on the side opposite to the viewing side of the liquid crystal cell.
- the liquid crystal panel of the present invention is a commercially available polarizing plate having two dimensional change rates, and a commercially available liquid crystal cell is used as it is on the viewing side of the liquid crystal cell.
- Examples of the treatment for increasing or decreasing the dimensional change rate of the polarizing plate include (1) a method of adjusting the moisture content of the polarizing plate by subjecting a commercially available polarizing plate to a heat treatment. Specifically, when the moisture content of the polarizing plate is increased, the dimensional change rate can be decreased, and when the moisture content of the polarizing plate is decreased, the dimensional change rate can be increased.
- (2) in the manufacturing process of the polarizing plate a method of changing the tension applied to the polarizing plate can be mentioned.
- the temperature for the heat treatment is preferably 60 ° C to 90 ° C, more preferably 70 ° C to 90 ° C.
- the heating time is 5 seconds to 600 seconds, more preferably 30 seconds to 300 seconds.
- the tension applied to the polarizing plate in order to increase the rate of dimensional change, is preferably 300N to 700N, more preferably 400N to 600N. In order to reduce the dimensional change rate, the tension applied to the polarizing plate is preferably 50N to 150N, and more preferably 70N to 120N. Detailed mechanism is unclear force By applying such treatment, it is possible to adjust the dimensional change rate of the polarizing plate in the range of 0.08% to + 0.05% compared to before treatment.
- the first polarizing plate and the second polarizing plate having a predetermined dimensional change rate difference can be obtained.
- the moisture content (W) of the second polarizing plate is preferably 2.5% to 3.5%, and more preferably.
- the range is from 2.7% to 3.3%.
- the water content (W) of the first polarizing plate is preferably 2.3% to 3.2%, and more preferably 2.5% to 3.1%.
- the transmittance of the above polarizing plate measured at 23 ° C. at a wavelength of 550 nm is preferably 40% or more, more preferably 42% or more.
- the theoretical upper limit of single transmittance is 50%, and the practical upper limit is 46%.
- the polarization degree of the polarizing plate is preferably 99.8% or more, and more preferably 99.9% or more.
- the theoretical upper limit of the degree of polarization is 100%.
- Hue according to National Bureau of Standards (NBS) of the polarizing plate Hue according to National Bureau of Standards (NBS) of the polarizing plate;
- the a value (single a value) is preferably ⁇ 2.0 or more, and more preferably ⁇ 1.8 or more.
- the ideal value for the a value is 0.
- the hue of the polarizing plate according to National Bureau Standards (NBS); b value (single b value) is preferably 4.2 or less, and more preferably 4.0 or less.
- the ideal value of the b value is 0.
- the single transmittance, polarization degree, and hue can be measured using a spectrophotometer [Murakami Color Research Laboratory, product name “DOT-3”].
- a spectrophotometer Murakami Color Research Laboratory, product name “DOT-3”
- the parallel transmittance (H) and orthogonal transmittance (H) of the polarizing plate are measured,
- the parallel transmittance (H) is obtained by superimposing two identical polarizing plates so that their absorption axes are parallel to each other.
- transmittance 90 is the transmittance value of an orthogonal laminated polarizing plate produced by superposing two identical polarizing plates so that their absorption axes are orthogonal to each other. Note that these transmittances are Y values that have been corrected for visibility using the two-degree field of view (C light source) of JIS Z 8701-1982.
- the polarizer used in the present invention is preferably a stretched film mainly composed of a polyhydric alcohol-based resin containing iodine or a dichroic dye.
- the “stretched film” refers to a polymer film in which tension is applied to an unstretched film at an appropriate temperature and the orientation of molecules is increased along the tensile direction.
- the thickness of the polarizer may be appropriately selected according to the purpose.
- the thickness of the polarizer is preferably 5 ⁇ m to 50 ⁇ m, more preferably 10 ⁇ m to 30 ⁇ m.
- the polybula alcohol-based resin is obtained by polymerizing a butyl ester monomer. It can be obtained by saponifying a vinyl ester polymer.
- the saponification degree of the polyvinyl alcohol-based resin is preferably 95.0 mol% to 99.9 mol%.
- the saponification degree can be determined according to JIS K 6726-1994.
- a polarizer having excellent durability can be obtained by using a polybula alcohol-based resin having a Keny degree within the above range.
- the average degree of polymerization of the polyvinyl alcohol-based resin may be appropriately selected according to the purpose.
- the average degree of polymerization is preferably 1200 to 3600.
- the average degree of polymerization can be determined according to JI S K 6726-1994.
- any appropriate forming method may be employed.
- the molding method include the method described in JP-A 2000-315144 [Example 1].
- the polymer film containing the polyvinyl alcohol-based resin as a main component preferably contains a plasticizer and Z or a surfactant.
- the plasticizer include polyhydric alcohols such as ethylene glycol and glycerin.
- the polyhydric alcohol is
- the surfactant includes nonionic surfactants.
- the surfactant is used for the purpose of further improving the dyeability and stretchability of the polarizer.
- a commercially available film can be used as it is as the polymer film mainly composed of polybula alcohol-based resin used in the present invention.
- Kuraray Co., Ltd. trade name “Kuraray-Blon Film”, Tosero Co., Ltd., trade name “Tosero Vinylon Film”, Nippon Synthetic Chemical Industry Co., Ltd. Vinylon film ”.
- FIG. 2 is a schematic diagram showing the concept of a typical production process for a polarizer used in the present invention.
- a polymer film 501 mainly composed of polyvinyl alcohol-based resin is fed from a feeding unit 500, immersed in an aqueous iodine solution bath 510, and rolls 511 and 512 having different speed ratios in the longitudinal direction of the film. While being applied with tension, it is subjected to a swelling and dyeing process. Next, it is immersed in a bath 520 of an aqueous solution containing hydrofluoric acid and potassium iodide, and rolls 52 having different speed ratios.
- the crosslinked film While being tensioned in the longitudinal direction of the film at 1 and 522, it is subjected to a crosslinking treatment.
- the crosslinked film is immersed in an aqueous solution bath 530 containing potassium iodide by rolls 531 and 532 and subjected to a water washing treatment.
- the film that has been washed with water is dried by a drying means 540 so that the moisture content is adjusted, and is taken up by a take-up unit 560.
- the polarizer 550 can be obtained through these steps by stretching a polymer film mainly composed of the polybulualcohol-based resin to 5 to 7 times the original length.
- the first protective layer 2 is disposed on the liquid crystal cell 10 side of the first polarizer 1.
- the first protective layer is used for the purpose of preventing the polarizer from contracting and expanding, and preventing deterioration due to ultraviolet rays.
- the thickness of the first protective layer may be appropriately selected according to the purpose.
- the thickness of the protective layer is preferably 20 ⁇ m to 100 ⁇ m. By setting the thickness of the first protective layer within the above range, a polarizing plate excellent in mechanical strength and durability can be obtained.
- the transmittance of the first protective layer measured with light having a wavelength of 590 nm at 23 ° C is preferably 90% or more.
- the practical upper limit of the transmittance is 96%.
- the absolute value (C [590] (m 2 ZN)) of the photoelastic coefficient of the first protective layer is preferably 1 X 10 _12 to 100 X 10_ 12 , and more preferably 1 10 _12. ⁇ 60 10 _12 .
- the first protective layer used in the liquid crystal panel of the present invention is disposed between the polarizer and the liquid crystal cell, the optical characteristics may affect the display characteristics of the liquid crystal display device. The Therefore, it is preferable to use the first protective layer having an appropriate retardation value.
- the first protective layer is substantially optically isotropic.
- substantially optically isotropic means that 1 ⁇ [590] is less than 1011111 and the absolute value of the retardation value in the thickness direction (IRth [590] I) In which is less than lOnm.
- Re [590] of the first protective layer is preferably less than lOnm, more preferably 8 nm or less, and particularly preferably 5 nm or less.
- ) of the first protective layer is preferably less than lOnm, more preferably 8 nm or less, and particularly preferably 5 nm or less. .
- Rth [590] I By setting Rth [590] I within the above range, a color shift in an oblique direction is extremely small, and a liquid crystal display device can be obtained.
- the first protective layer is a polymer film containing cellulosic resin. Since the cellulose-based resin is excellent in adhesiveness with the above polarizer, it is possible to obtain a polarizing plate in which peeling does not occur in each constituent member even in a high temperature and high humidity environment.
- the cellulose-based resin preferably has a part or all of hydroxyl groups of cellulose having a acetyl group or propio group.
- cellulose organic acid ester or cellulose mixed organic acid ester substituted with zul group and z or butyl group.
- the cellulose organic acid ester include cenorelose acetate, cenorelose propionate, cenorelose butyrate, and the like.
- the cellulose mixed organic acid ester include cellulose acetate propionate and cellulose acetate butyrate.
- the cellulose-based resin can be obtained, for example, by the method described in JP-A-2001-188128 [0040] to [0041].
- the weight average molecular weight (Mw) of the cellulose-based resin is a value measured by a gel permeation chromatography (GPC) method using a tetrahydrofuran solvent, preferably 20,000 to 1,000,000, More preferred ⁇ is 25,000-800,000.
- the said weight average molecular weight is the value measured by the method as described in an Example.
- the glass transition temperature (Tg) of the cellulose-based resin is preferably 110 ° C to 185 ° C. If Tg is 110 ° C or higher, a film having good thermal stability can be easily obtained, and if it is 185 ° C or lower, molding processability is excellent.
- the glass transition temperature (Tg) can be determined by the DSC method according to JIS K 7121.
- any appropriate forming method can be adopted. Examples of the molding method include compression molding, transfer molding, injection molding, extrusion molding, blow molding, powder molding, FRP molding, and solvent casting.
- the molding method is a solvent casting method. They can obtain a polymer film excellent in smoothness and optical uniformity.
- the above solvent casting method is performed by defoaming a concentrated solution (dope) obtained by dissolving a resin composition containing a resin, an additive, and the like as a main component in a solvent, and then endless stainless steel belt.
- a concentrated solution obtained by dissolving a resin composition containing a resin, an additive, and the like as a main component in a solvent
- it is a method of casting a film on the surface of a rotating drum uniformly to form a film by evaporating the solvent.
- the conditions adopted at the time of film formation can be appropriately selected according to the purpose.
- the polymer film containing the cellulose-based resin may further contain any appropriate additive.
- the additives include plasticizers, heat stabilizers, light stabilizers, lubricants, antioxidants, ultraviolet absorbers, flame retardants, colorants, antistatic agents, compatibilizers, crosslinking agents, and additives. A sticky agent etc. are mentioned.
- the content of the additive can be appropriately set according to the purpose. Preferably, the content of the additive is more than 0 and not more than 20 parts by weight with respect to 100 parts by weight of the cellulosic resin.
- the first protective layer a commercially available film can be used as it is.
- a commercially available film that has been subjected to secondary processing such as stretching and Z or shrinkage can be used.
- Commercially available polymer films containing cellulosic resin include, for example, Fuji Photo Film Co., Ltd. Fujitac Series (trade names; ZRF80S, TD80UF, TDY-80UL), Co-Camino Nortop Co., Ltd. "KC8UX2M” etc.
- the second protective layer 3 is disposed on the opposite side of the first polarizer 1 from the liquid crystal cell 10 side.
- the second protective layer 3 is used for the purpose of preventing the polarizer from contracting and expanding and preventing deterioration due to ultraviolet rays.
- any appropriate layer may be adopted as the second protective layer.
- C-3 Those having absolute values of thickness, transmittance, and photoelastic coefficient in the range described in the section are used. Since the second protective layer is disposed outside the polarizer, it is not necessary to precisely adjust the retardation value like the first protective layer.
- the second protective layer is a polymer film containing cellulosic resin.
- the polymer film containing the cellulose-based resin the same film as described in the section C3 is preferably used.
- the second protective layer further includes a surface treatment layer on the side opposite to the first polarizer (that is, the outermost side).
- a surface treatment layer an appropriate treatment layer may be employed depending on the purpose.
- the surface treatment layer include treatment layers such as hard coat treatment, antistatic treatment, antireflection treatment (both anti-reflection treatment) and diffusion treatment (both anti-glare treatment! And u). These surface treatment layers are used for the purpose of preventing the screen from becoming dirty or damaged, or preventing the display image from becoming difficult to see due to the appearance of indoor fluorescent light or sunlight on the screen.
- the surface treatment layer is one in which a treatment agent for forming the treatment layer is fixed on the surface of a base film.
- the base film may also serve as the second protective layer.
- the surface treatment layer may have a multilayer structure in which a hard coat treatment layer is laminated on an antistatic treatment layer, for example.
- a commercially available polymer film subjected to surface treatment can be used as it is.
- a commercially available polymer film can be used after being subjected to any surface treatment.
- Examples of commercially available films that have been subjected to diffusion treatment include AG150, AGS1, AGS2, and AGT1 manufactured by Nitto Denko Corporation.
- Examples of commercially available films that have been subjected to antireflection treatment include ARS and ARC manufactured by Nitto Denko Corporation.
- An example of a commercially available film that has been subjected to a hard coat treatment and an antistatic treatment is “KC8UX-HA”, a product name manufactured by Co-Caminoltop Co., Ltd.
- An example of a commercially available film that has been subjected to antireflection treatment is ReaLook series manufactured by NOF Corporation.
- the third protective layer 5 is disposed on the liquid crystal cell 10 side of the second polarizer 4.
- the third protective layer used in the present invention any appropriate one can be adopted from the conditions, materials, etc. described in the first protective layer.
- the first protective layer and the third protective layer may be the same or different from each other.
- the third protective layer is substantially optically isotropic.
- the fourth protective layer 6 is disposed on the opposite side of the second polarizer 4 from the liquid crystal cell 10 side.
- any appropriate force such as the conditions and materials described in the second protective layer can be adopted.
- the second protective layer and the fourth protective layer may be the same or different from each other.
- the first pressure-sensitive adhesive layer 31 is provided between the liquid crystal cell 10 and the first polarizing plate 21. Further, the second pressure-sensitive adhesive layer 32 is provided between the liquid crystal cell 10 and the second polarizing plate 22.
- the pressure-sensitive adhesive layer (first pressure-sensitive adhesive layer and second pressure-sensitive adhesive layer) used in the present invention can be formed of any appropriate material. As a specific example, an adhesive layer formed by crosslinking an adhesive composition will be described. The adhesive composition will be described later. In the present specification, “crosslinking” means that a polymer is cross-linked to form a three-dimensional network structure.
- the pressure-sensitive adhesive layer may further contain an appropriate optional component! /.
- the optional component include metal powder, glass fiber, glass bead, silica, filler, and the like.
- the content of the optional component is preferably more than 0 and 10 parts by weight or less, and more preferably more than 0 and 5 parts by weight or less with respect to 100 parts by weight of the total solid content forming the pressure-sensitive adhesive layer.
- the pressure-sensitive adhesive layer may contain a migration substance (for example, residual solvent, additive, oligomer, etc.) from an adjacent layer.
- the pressure-sensitive adhesive composition contains at least a (meth) acrylic polymer (A).
- the (meth) aryl polymer (A) is composed of an acrylate monomer and a Z or metatarylate monomer (hereinafter referred to as (meth) acrylate) or a polymer or copolymer synthesized.
- the arrangement state of the molecule may be a random copolymer with no particular limitation, a block copolymer, or a graft.
- a copolymer may also be used.
- a preferable molecular arrangement state of the (meth) acrylic polymer (A) is a random copolymer.
- the (meth) acrylic polymer (A) can be obtained, for example, by (co) polymerizing an alkyl (meth) acrylate (al).
- the alkyl group of the alkyl (meth) acrylate (al) may be linear, branched or cyclic.
- the number of carbon atoms of the alkyl group of the alkyl (meth) acrylate (al) is preferably about 1 to 18, more preferably 1 to 10.
- alkyl (meth) acrylate (al) include methyl (meth) acrylate and ethyl.
- the (meth) acrylic polymer (A) is preferably obtained by copolymerization of the alkyl (meth) acrylate (al) and the hydroxyl group-containing (meth) acrylate (a2).
- a copolymer since it has excellent reactivity with the peroxide (B) described later, a pressure-sensitive adhesive layer having excellent adhesiveness can be obtained.
- the alkyl group of the alkyl (meth) acrylate (al) preferably has 1 to 8, more preferably 2 to 8, particularly preferably 2 to 6, and most preferably 4 to 6.
- the alkyl group of the alkyl (meth) acrylate (al) may be linear or branched! /.
- hydroxyl group-containing (meth) acrylate (a2) include 2-hydroxyethyl (me ) Atarylate, 3 Hydroxypropyl (meth) acrylate, 2 Hydroxypropyl (meth) acrylate, 4-Hydroxybutyl (meth) acrylate, 3-Hydroxybutyl (meth) acrylate, 2 Hydroxybutyl (meth) Atalylate, 5-hydroxypentyl (meth) acrylate, 3-hydroxy-3-methylbutyl (meth) acrylate, 6-hydroxyhexyl (meth) acrylate, 7-hydroxyheptyl (meth) acrylate, 8-hydroxy Examples include octyl (meth) acrylate, 10-hydroxydecyl (meth) acrylate, 12-hydroxy lauryl (meth) acrylate, (4-hydroxymethylcyclohexyl) methyl acrylate. These can be used alone or in combination of two or more.
- the number of carbon atoms of the hydroxyalkyl group of the hydroxyl group-containing (meth) acrylate (a2) is preferably equal to or more than the number of carbon atoms of the alkyl group of the alkyl (meth) acrylate (al). Furthermore, the number of carbon atoms of the hydroxyalkyl group of the hydroxyl group-containing (meth) acrylate (a2) is preferably 2-8, more preferably 4-6. Thus, by adjusting the number of carbon atoms, the reactivity with the peroxide compound (B) described later can be improved, and a pressure-sensitive adhesive layer having even more excellent adhesiveness can be obtained. be able to.
- an isocyanate compound (C) described later can be excellent in reactivity with an isocyanate compound (C) described later.
- a2 4-hydroxybutyl (meth) acrylate is used as the hydroxyl group-containing (meth) acrylate (a2)
- methyl (meth) acrylate or ethyl (meth) is used as the alkyl (meth) acrylate (al).
- Atallate propyl (meth) acrylate or butyl (meth) acrylate is preferably used.
- the copolymerization amount of the hydroxyl group-containing (meth) acrylate (a2) is preferably 0.1 to: LO mol%, more preferably 0.2 to 5 mol%, and particularly preferably 0.3 to 1. 1 mol%.
- the amount of copolymerization is in the above range, an adhesive layer having excellent adhesion, durability and stress relaxation properties can be obtained.
- the (meth) acrylic polymer (A) is obtained by copolymerizing other components in addition to the alkyl (meth) acrylate (al) and the hydroxyl group-containing (meth) acrylate (a2). You can also. Other components include, but are not limited to, (meth) acrylic acid, benzyl (meth) acrylate, methoxychetyl (meth) acrylate, ethoxymethyl (meth) acrylate, phenoxychetyl (meth) acrylate, (meth) Acrylamide, butyl acetate, (meth) acrylonitrile, etc. are preferably used. Copolymerization amount of other components is 100 parts by weight of alkyl (meth) acrylate (al) The amount is preferably 100 parts by weight or less, more preferably 50 parts by weight or less.
- the weight average molecular weight (Mw) of the (meth) acrylic polymer (A) is preferably 1 million or more, more preferably 1.2 million to 3 million, and particularly preferably 1.2 million to 2.5 million. Mw can be adjusted by appropriately selecting the solvent during polymerization, temperature, additives described later, and the like.
- the (meth) acrylic polymer (A) can be produced by any appropriate method.
- a radical polymerization method such as a norc polymerization method, a bulk polymerization method, a solution polymerization method, or a suspension polymerization method can be appropriately selected.
- any appropriate radical polymerization initiator for example, azo type or peroxy acid type
- the reaction temperature is usually about 50 to 80 ° C, and the reaction time is usually 1 to 30 hours.
- the solution polymerization method is preferable. This is because the polymerization temperature can be adjusted with high accuracy, and the polymer solution after polymerization can be easily taken out from the reaction vessel.
- the solvent used in the solution polymerization method generally include ethyl acetate and toluene.
- the solution concentration is usually about 20 to 80% by weight.
- the solution polymerization method will be specifically described. For example, the monomer is dissolved in a solvent, and 0.01 to 0.2 parts by weight of a polymerization initiator such as azobisisobutyoritol-tolyl is added to 100 parts by weight of the monomer to prepare a solution. Then, under a nitrogen atmosphere, the temperature of the solution is set to 50 ° C. to 70 ° C. and reacted for 8 to 30 hours.
- the adhesive composition may preferably contain a peroxide (B).
- a peroxide (B) is not particularly limited as long as it can generate a radical by heating to achieve crosslinking of the (meth) acrylic polymer (A).
- peracid compounds (B) include, for example, hydrated baroxides, dialkyl peroxides, peroxyesters, disilver oxides, peroxydicarbonates, peroxyketals, and ketone peroxides. Etc.
- di (2-ethylhexyl) peroxydicarbonate di (4 tert-butylcyclohexyl) peroxydicarbonate, di-sec butyrateoxydicarbonate, t-butylperoxyneo Decanoate, t-hexyl peroxypivalate, t-butyl peroxypivalate, dilauroyl peroxide
- disilver oxides are preferably used, and more preferably dibenzoyl peroxide and Z or benzoylmethylbenzoyl peroxide. This is because these peroxides have a one-minute half-life temperature of 90 ° C. to 140 ° C., which will be described later, and thus have excellent storage stability and can control the crosslinking reaction with high accuracy.
- the peroxyacid compound (B) a commercially available product can be used as it is.
- Specific examples of commercially available products include the Parroyl series (trade names “IB, 335, L, SA, IPP, NPP, TCP, etc.”, manufactured by NOF Corporation), Nyper series (trade names “FF, BO, NS, E, BMT-Y, BMT—K40, BM T—M, etc., manufactured by NOF Corporation).
- the amount of the peroxide (B) is preferably 0.01 to 1 part by weight, more preferably 0.05 to 0. 8 to 100 parts by weight of the (meth) acrylic polymer (A). Part by weight, particularly preferably 0.1 to 0.5 part by weight, most preferably 0.15 to 0.45 part by weight.
- the pressure-sensitive adhesive layer can sufficiently achieve the above-mentioned holding power, and can exhibit appropriate stress relaxation properties and excellent thermal stability. As a result, light leakage that occurs in a high humidity environment can be effectively suppressed.
- a pressure-sensitive adhesive layer having a low moisture content can be obtained by containing a peroxide. It is thought that the low moisture content of the pressure-sensitive adhesive layer also contributes to the reduction of light leakage of the liquid crystal display device.
- the pressure-sensitive adhesive composition may preferably further contain an isocyanate compound. This is because adhesion (also referred to as throwing power) can be improved.
- Isocyanate compounds include tolylene diisocyanate, chlorodiene diisocyanate, hexamethylene diisocyanate, tetramethylene diisocyanate, isophorone diisocyanate, xylylene diisocyanate, diphene.
- -Isocyanate monomers such as methane diisocyanate, trimethylolpropane xylene diisocyanate, hydrogenated diphenylmethane diisocyanate; Adac with alcohol Isocyanurate compound; isocyanurate compound; burette type compound; and further, an appropriate polyether polyol, polyester polyol, acrylic polyol, polybutadiene polyol, polyisoprene polyol and the like, a urethane precursor polymer type isocyanate. These can be used alone or in combination of two or more. Among these, trimethylolpropane xylene diisocyanate is preferably used. This is because the adhesion can be further improved.
- isocyanate compound a commercially available product can be used as it is.
- the first series for example, “L, MR, EH, HL, etc.”.
- An appropriate amount of the isocyanate compound can be set according to the purpose.
- the amount is preferably 0.1 to 1.5 parts by weight, more preferably 100 parts by weight of the (meth) acrylic polymer (A). Is 0.3 to 1.0 parts by weight, particularly preferably 0.4 to 0.8 parts by weight.
- the amount of the compound is preferably 0.005-0. 5 parts by weight, more preferably 0 with respect to 100 parts by weight of the (meth) acrylic polymer (A). 005 to 0.2 parts by weight, particularly preferably 0.01 to 0.08 parts by weight.
- the pressure-sensitive adhesive layer can sufficiently achieve the above-mentioned holding power, and sarako can exhibit appropriate stress relaxation properties and excellent thermal stability.
- sarako can exhibit appropriate stress relaxation properties and excellent thermal stability.
- light leakage that occurs in a high humidity environment can be effectively suppressed.
- adhesion can be good even in harsh (high temperature, high humidity) environments.
- peroxides and isocyanate group compounds as the crosslinking agent is considered to contribute to the reduction of light leakage.
- the adhesive composition may preferably further contain a silane coupling agent. This is because the adhesion between the pressure-sensitive adhesive layer and the liquid crystal cell substrate can be improved.
- a silane coupling agent As a silane coupling agent
- Those having any appropriate functional group may be used.
- the functional group include a vinyl group, an epoxy group, a methacryloxy group, an amino group, a mercapto group, an attaryloxy group, an acetoacetyl group, an isocyanate group, a styryl group, and a polysulfide group.
- silane coupling agents include vinyltrimethoxysilane and ⁇ -glycidoxypropyltrimethoxy.
- silane coupling agent a commercially available product can be used as it is.
- examples of commercially available silane coupling agents include Shin-Etsu Silicone Co., Ltd. ⁇ series (trade name “ ⁇ -1003”, etc.), Shin-Etsu Silicone Co., Ltd. ⁇ series (trade names “ ⁇ -303, ⁇ -403, ⁇ ”). — 503 etc.), Shin-Etsu Silicone Co., Ltd. ⁇ series (Product name “ ⁇ -402, KB E-502, KBE-903 etc.”), Toray Industries, Inc. SH series (Product name “SH6020, SH604 0, SH6062 etc .;), SZ series (trade name “SZ6030, SZ6032, SZ630 0 etc.”) manufactured by Toray Industries, Inc.
- an appropriate amount of the silane coupling agent may be set according to the purpose.
- the blending amount is preferably from 0.01 to 2 parts by weight, more preferably from 0.005 to 2 parts by weight, particularly preferably from 0.001 to 100 parts by weight of the (meth) acrylic polymer (A). 01 to 1 part by weight, most preferably 0.02 to 0.5 part by weight.
- the above-mentioned pressure-sensitive adhesive composition may further contain various additives without departing from the object of the present invention.
- additives include plasticizers, heat stabilizers, light stabilizers, lubricants, antioxidants, ultraviolet absorbers, flame retardants, colorants, antistatic agents, compatibilizers, crosslinking agents, thickeners, and pigments. Etc.
- the blending amount of the other additives may be set appropriately depending on the purpose.
- the above-mentioned pressure-sensitive adhesive composition can be prepared, for example, by mixing each of the above-mentioned components and any appropriate solvent.
- the pressure-sensitive adhesive composition may be a solution or a dispersion.
- Each of the above components and the solvent may be mixed together, or the respective components may be sequentially added to the solvent.
- the (meth) acrylic polymer (A) is dissolved in a solvent to prepare a solution, and the peracid (B), the isocyanate compound, and the silane coupling agent are added to the solution. Agents are added sequentially.
- the solid content concentration of the adhesive composition is preferably 15 to 45% by weight, more preferably 20 to 40% by weight. If it is such a range, it is excellent in the coating property to a base material, As a result, the adhesive layer excellent in surface uniformity can be obtained.
- the pressure-sensitive adhesive layer is formed by coating the pressure-sensitive adhesive composition on any appropriate base material and crosslinking the coating layer.
- a coating method a coating method using any appropriate coater can be adopted.
- Any appropriate substrate can be adopted as the substrate.
- a polymer film for example, PET film
- a typical method for crosslinking the pressure-sensitive adhesive composition is a method by heating. The heating temperature is preferably 50 ° C to 200 ° C, more preferably 120 ° C to 170 ° C.
- the heating time is preferably 5 seconds to 20 minutes, more preferably 10 seconds to 5 minutes. Under such conditions, a pressure-sensitive adhesive layer having excellent pressure-sensitive adhesive properties can be obtained with high efficiency.
- the formed pressure-sensitive adhesive layer can be stored for an appropriate period of time and aged.
- “aging (also referred to as aging)” means that a desirable property or state is obtained by causing diffusion or chemical reaction of a substance contained in an adhesive layer.
- the aging conditions can be appropriately selected according to the type and content of each component of the adhesive composition.
- the aging temperature is preferably 10 ° C to 80 ° C, more preferably 20 ° C to 70 ° C.
- the aging time is preferably 3 days or more, more preferably 5 days or more, and particularly preferably 7 days or more. If the aging period is too short, the desired characteristics cannot be obtained. There is a match. Even if the aging period is too long, there is not much difference in the obtained characteristics, so there is no advantage in production efficiency, in many cases!
- the base material 302 is fed out from the first feed-out part 301, and the polymer solution (1B) is applied in the coater part 303.
- the coated material coated on the surface of the substrate is sent to a temperature control means (drying means) 304, and heated and dried at, for example, 50 ° C. to 200 ° C. to form an adhesive layer.
- a polarizing plate is drawn out from the second drawing-out portion 306 and laminated on the pressure-sensitive adhesive layer by laminating rolls 307 and 308.
- the laminate 309 of the polarizing plate, the pressure-sensitive adhesive layer, and the base material 302 thus obtained is wound up by the winding unit 310.
- the substrate 302 can be used as it is as a release liner.
- the liquid crystal display device of the present invention includes the liquid crystal panel.
- FIG. 4 is a schematic cross-sectional view of a liquid crystal display device according to a preferred embodiment of the present invention. For the sake of clarity, it should be noted that the ratio of the vertical, horizontal, and thickness of each component shown in Fig. 4 is different from the actual one.
- the liquid crystal display device 200 includes a liquid crystal panel 100 and a backlight unit 80 disposed on one side of the liquid crystal panel 100. In the illustrated example, a case where the direct light method is adopted as the knock light unit is shown, but this may be, for example, a side light method.
- the backlight unit 80 preferably includes a light source 81, a reflection film 82, a diffusion plate 83, a prism sheet 84, and a brightness enhancement film 85.
- the backlight unit preferably further includes a light guide plate and a light reflector. Note that the optical member illustrated in FIG. 4 has a force that can be partially omitted depending on the application, such as the illumination method of the liquid crystal display device and the driving mode of the liquid crystal cell, as long as the effect of the present invention is obtained. Other optical members can be substituted.
- the liquid crystal display device may be a transmissive type in which the back surface of the liquid crystal panel is irradiated with light to view the screen, or a reflective type in which light is radiated from the viewing side of the liquid crystal panel to view the screen. It's okay.
- the liquid crystal display device has both transmissive and reflective properties.
- a semi-transmissive type may also be used.
- liquid crystal panel and the liquid crystal display device of the present invention are not particularly limited, such as office equipment such as power monitor, notebook computer, copy machine, mobile phone, watch, digital camera, personal digital assistant (PDA) , Portable devices such as portable game machines, household electrical devices such as video cameras, LCD TVs, microwave ovens, knock monitors, monitors for car navigation systems, in-vehicle devices such as car audio, monitors for information stores in commercial stores, etc. It can be used for various purposes such as exhibition equipment, security equipment such as monitoring monitors, nursing care and medical equipment such as nursing monitors and medical monitors.
- office equipment such as power monitor, notebook computer, copy machine, mobile phone, watch, digital camera, personal digital assistant (PDA)
- Portable devices such as portable game machines, household electrical devices such as video cameras, LCD TVs, microwave ovens, knock monitors, monitors for car navigation systems, in-vehicle devices such as car audio, monitors for information stores in commercial stores, etc. It can be used for various purposes such as exhibition equipment, security equipment such as monitoring monitors, nursing
- the liquid crystal panel and the liquid crystal display device of the present invention are used in a large-sized liquid crystal television.
- the screen size of a liquid crystal television in which the liquid crystal panel and the liquid crystal display device of the present invention are used is preferably a wide 17-inch (373 mm x 224 mm) or larger, more preferably a wide 23-inch (499 mm x 300 mm) or larger.
- it is more preferably wide type 26 (56 6 mm ⁇ 339 mm) or more, and most preferably wide type 32 (687 mm ⁇ 412 mm) or more.
- Polystyrene was calculated as a standard sample by the gel “permeation” chromatograph (GPC) method. Specifically, it measured with the following apparatuses, instruments, and measurement conditions.
- the sample used was a filtrate obtained by dissolving a sample in tetrahydrofuran to make a 0.1 wt% solution, leaving it to stand, and then filtering it with a 0.45 m membrane filter.
- the refractive index was determined from the refractive index measured at 23 ° C. with a wavelength of 589 nm.
- the in-plane retardation value (Re) of each wavelength at 23 ° C, the retardation value (R40) measured by tilting the slow axis by 40 degrees with the slow axis as the tilt axis, the thickness (d) and the position of the retardation layer Rth can be calculated by calculating nx, ny, and nz by computer numerical calculation using the average refractive index ( ⁇ ) of the retardation layer.
- UV-Vis spectrophotometer manufactured by JASCO Corporation, product name “V-560”
- measurement was performed with light at a wavelength of 590 nm at 23 ° C.
- the color shift amount (A xy) in the oblique direction was calculated from the formula: ⁇ (x60, 60-xO, 0) 2+ (y60, 60-yO, 0) 2 ⁇ 1/2 force.
- x60, 60 and y60, 60 ⁇ , azimuth angle 60 °, polar angle 60 ° Represent the color coordinates x and y, respectively, and ⁇ , 0 and yO, 0 represent the color coordinates X and y, respectively, at an azimuth angle of 0 ° and a polar angle of 0 ° (ie, front direction).
- the liquid crystal panel was stored in a constant temperature and humidity chamber at 40 ° C and 70% RH for 20 hours, and then taken out into a room at 23 ° C.
- This liquid crystal panel was installed in a liquid crystal display device, and the display screen was photographed in a dark room at 23 ° C using Minota's two-dimensional color distribution measuring device “CA-1500”.
- a sample cut from a polarizing plate to 10cm XI Ocm was stored in a constant temperature and humidity chamber at 40 ° C and 70% RH for 20 hours, and then left at 23 ° C for 1 hour for testing (high humidity acceleration test ). Measure the length of one side of the polarizing plate before and after this test and use the formula: ⁇ (side length after test side length before test) Z side length before test ⁇ C) was calculated.
- Anti-glare-treated protective layer Z polarizer A commercially available polarizing plate having a configuration of Z protective layer [trade name “NPF TG—SIG1423DUAGS2B” manufactured by Nitto Denko Corporation] was used as the polarizing plate A as it was.
- Polarizing plate A had a dimensional change rate of 0.066 and a moisture content of 3.0%.
- the optical characteristics of the polarizing plate A the single transmittance was 42.6%, the degree of polarization was 99.99%, the hue a value was 1.5, and the hue b value was 3.8.
- the protective layer of polarizing plate A was substantially optically isotropic, with Re [590] being 0.5 nm and Rth [590] being 1.0.
- Roll-shaped polarizing plate [Nitto Denko Co., Ltd. product name "NPF TG-SIG1423DUAGS2 B" equivalent product (roll-shaped product before stamping)] is sized using a temperature control device equipped with tension control means
- the polarizing plate B was obtained by adjusting the rate.
- the polarizing plate B was obtained by subjecting the polarizing plate A phase-like product to a dimensional change rate adjustment treatment. Processing conditions are air Circulating drying oven: 75 ° C, line speed: 10 mZ min, line tension: 200 N.
- the polarizing plate B had a dimensional change rate of 0.123 and a moisture content of 2.8%.
- the optical properties of the polarizing plate B were the same as those of the polarizing plate A.
- Polarizing plate C having a configuration of Z protective layer [trade name “NPF TG-SIG1423DU” manufactured by Nitto Denko Corporation] was used as the polarizing plate C as it was.
- Polarizing plate C had a dimensional change rate of 0.083 and a moisture content of 3.0%.
- the optical characteristics of the polarizing plate C were the same as those of the polarizing plate A.
- Roll-shaped polarizing plate [Product name “NPF TG—SIG1423DU” equivalent (manufactured before punching)] manufactured by Nitto Denko Co., Ltd.] is adjusted using a temperature controller equipped with tension control means.
- the polarizing plate D was obtained by processing.
- the polarizing plate C was obtained by subjecting the polarizing plate C phase or the like to a dimensional change rate adjustment treatment.
- the treatment conditions were air circulation drying oven: 75 ° C, line speed: 10 mZ min, line tension: 200 N.
- Polarizing plate D had a dimensional change rate of 0.095 and a moisture content of 2.8%.
- the optical characteristics of the polarizing plate D were the same as those of the polarizing plate A.
- Roll-shaped polarizing plate [Product name “NPF TG—SIG1423DU” equivalent (manufactured before punching)] manufactured by Nitto Denko Co., Ltd.] is adjusted using a temperature controller equipped with tension control means.
- the polarizing plate E was obtained by processing. In other words, a polarizing plate E was obtained by subjecting the polarizing plate C phase or the like to a dimensional change rate adjustment treatment.
- the treatment conditions were an air-circulating drying oven: 80 ° C., line speed: 10 mZ min, and line tension: 500N.
- Polarizing plate E had a dimensional change rate of 0.020.
- the optical characteristics of polarizing plate E are the same as those of polarizing plate A. o
- Anti-glare-treated protective layer Z-polarizer Commercially available polarizing plate having the configuration of Z-protecting layer [trade name “NPF SEG1423DUAGS2B” manufactured by Nitto Denko Corporation] was used as polarizing plate F as it was.
- the optical characteristics of Polarizer F are 44.1% for single transmittance and 99.97% for polarization.
- the hue a value was 1.5 and the hue b value was 3.7.
- the protective layer of the polarizing plate F was substantially optically negative uniaxial, and Re [590] «0.5 nm and Rth [590] was 60 nm.
- polarizing plate having a Z protective layer configuration [trade name “NPF SEG1423DU” manufactured by Nitto Denko Corporation] was used as the polarizing plate G as it was.
- the optical characteristics of the polarizing plate G were the same as those of the polarizing plate F.
- Liquid crystal display device including liquid crystal cell in IPS mode [Toshiba Corporation 32V wide-screen LCD TV Product name “FACE (Model number: 32LC100) Screen size: 697mm X 392mm] Take the liquid crystal panel and place it above and below the liquid crystal cell Then, all the optical films such as the polarizing plate were removed, and the surfaces of both glass substrates of the obtained liquid crystal cell were washed to obtain liquid crystal cell A.
- a liquid crystal cell and a polarizing plate were laminated via the following pressure-sensitive adhesive layer.
- the acrylate copolymer obtained above was further diluted by adding ethyl acetate to prepare a polymer solution (1-A) having a total solid content of 30 wt%.
- a polymer solution (1-A) having a total solid content of 30 wt%.
- an isocyanate compound [Nippon Polyurethane Co., Ltd., trade name “Coronate L”] with respect to 100 parts by weight of the acrylate copolymer, 0.075
- a polymer solution (1- ⁇ ) was prepared by blending parts by weight of ⁇ -glycidoxypropyltrimethoxysilane [trade name “ ⁇ -403” manufactured by Shin-Etsu Chemical Co., Ltd.] in this order.
- the polymer solution (1- ⁇ ) obtained above was uniformly applied to the surface of a substrate (polyethylene terephthalate film treated with a silicone release agent) with a Fountain coater. Then, it is dried for 70 seconds in a 155 ° C air-circulating constant temperature oven, and the thickness of the substrate is 20 A ⁇ m adhesive layer A was formed.
- the acrylate copolymer obtained above was further diluted with acetyl acetate, to prepare a polymer solution (2-A) having a total solid concentration of 30% by weight.
- a polymer solution (2-A) having a total solid concentration of 30% by weight.
- dibenzoyl baroxide trade name “Nyper BO—Y” manufactured by Nippon Oil & Fats Co., Ltd.
- trimethylolpropane xylylene diisocyanate trade name “Takenate D110N” manufactured by Mitsui Takeda Chemical Co., Ltd.]
- silane coupling agent containing acetoacetyl group Soken Chemical
- the product name “A-100” manufactured by Co., Ltd. was blended in this order to prepare a polymer solution (2-B).
- the polymer solution (2-B) obtained above was uniformly applied to the surface of a substrate (polyethylene terephthalate film treated with a silicone release agent) with a Fountain coater. Then, it was dried for 70 seconds in a 155 ° C air circulation type constant temperature oven to form a 20 ⁇ m thick adhesive layer on the surface of the substrate.
- Corona treatment (1.2 kW / 15 m / min) was applied to the side of polarizing plate B that was not subjected to antiglare treatment.
- the pressure-sensitive adhesive layer A formed on the surface of the base material was stacked on the corona-treated surface of the polarizing plate B to obtain a laminate 1.
- This laminate 1 was aged in a 70 ° C air circulation type constant temperature oven for 7 days.
- the pressure-sensitive adhesive layer A formed on the surface of the base material was corona-treated (for 1.2 kWZl5 mZ).
- Lamination 2 was obtained by laminating on the treated surface of polarizing plate C. This laminate 2 was aged for 7 days in a 70 ° C air circulation type constant temperature oven.
- the laminate 1 from which the substrate was removed was stuck to the viewing side of the liquid crystal cell A. That is, the polarizing plate B was attached as the first polarizing plate through the adhesive layer A. At that time, the liquid crystal cell A was attached so that the long side direction and the absorption axis direction of the first polarizing plate were substantially parallel.
- the laminate 2 from which the base material had been removed was stuck to the knocklight side of the liquid crystal cell A. That is, the polarizing plate C was attached as the second polarizing plate through the adhesive layer A. At that time, the liquid crystal cell A was pasted so that the long side direction of the liquid crystal cell A and the absorption axis direction of the second polarizing plate were substantially perpendicular to each other. Thus, a liquid crystal panel A was obtained.
- Liquid crystal panel A was combined with the backlight unit of the liquid crystal display device [Matsushita Electric Industrial Co., Ltd. 32V type TH-32LX10] to produce liquid crystal display device A.
- Example 1 The same as Example 1 except that the adhesive layer B was used in place of the adhesive layer A as the adhesive layer for adhering the first polarizing plate and the second polarizing plate to the liquid crystal cell. By this method, a liquid crystal display device was produced.
- a liquid crystal display device was produced in the same manner as in Example 1, except that polarizing plate A was used instead of polarizing plate B as the first polarizing plate.
- Example 1 After the liquid crystal display device of Example 1 was stored in a constant temperature and humidity chamber at 40 ° CZ70% RH for 20 hours, the knocklight was turned on again, as shown in Fig. 5 (a). No leakage was observed, and good uniformity was observed on the entire surface. At this time, when a black image was displayed, the maximum luminance in the plane of the liquid crystal display device was 1.03. In Example 2 and Example 3, as in Example 1, no light leakage was observed, and good uniformity was exhibited over the entire surface. When a black image was displayed, the maximum in-plane brightness of the liquid crystal display device was 0.85 and 1.14, respectively.
- Example 1 The measurement result of the color shift of the liquid crystal display device of Example 1 is shown in FIG. 6 (a), and the measurement result of the color shift of the liquid crystal display device of Reference Example 1 is shown in FIG. 6 (b).
- Table 2 shows the color shift amount (A xy) of each liquid crystal display device. As is clear from these, Example 1 is the reference example 1. It can be seen that the color shift is smaller and better than
- the liquid crystal display device of the present invention can be suitably applied to a liquid crystal television, a mobile phone and the like.
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Abstract
Description
Claims
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP07739061A EP2012174A4 (en) | 2006-04-25 | 2007-03-20 | LIQUID CRYSTAL PANEL AND LIQUID CRYSTAL DISPLAY |
| US12/089,805 US7812902B2 (en) | 2006-04-25 | 2007-03-20 | Liquid crystal panel and liquid crystal display apparatus |
| CN2007800011945A CN101356472B (zh) | 2006-04-25 | 2007-03-20 | 液晶面板及液晶显示装置 |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2006120010A JP5268234B2 (ja) | 2006-04-25 | 2006-04-25 | 液晶パネルおよび液晶表示装置 |
| JP2006-120010 | 2006-04-25 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2007122941A1 true WO2007122941A1 (ja) | 2007-11-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/JP2007/055618 Ceased WO2007122941A1 (ja) | 2006-04-25 | 2007-03-20 | 液晶パネルおよび液晶表示装置 |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US7812902B2 (ja) |
| EP (1) | EP2012174A4 (ja) |
| JP (1) | JP5268234B2 (ja) |
| KR (1) | KR100957486B1 (ja) |
| CN (1) | CN101356472B (ja) |
| TW (1) | TW200801605A (ja) |
| WO (1) | WO2007122941A1 (ja) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015050075A1 (ja) * | 2013-10-03 | 2015-04-09 | 住友化学株式会社 | 偏光板のセット及び前面板一体型液晶表示パネル |
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| JP6664866B2 (ja) * | 2013-04-05 | 2020-03-13 | 住友化学株式会社 | 偏光板のセット及び前面板一体型液晶表示パネル |
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| JP6826886B2 (ja) | 2014-09-09 | 2021-02-10 | 住友化学株式会社 | 偏光板、及び、液晶パネルの製造方法 |
| KR101799975B1 (ko) * | 2014-10-31 | 2017-11-21 | 에스케이씨하이테크앤마케팅(유) | 액정표시장치용 색순도 향상 및 휘도 보상 필름 및 이를 포함하는 액정표시장치 |
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-
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- 2007-03-20 EP EP07739061A patent/EP2012174A4/en not_active Withdrawn
- 2007-03-20 US US12/089,805 patent/US7812902B2/en active Active
- 2007-03-20 KR KR1020087006568A patent/KR100957486B1/ko not_active Expired - Fee Related
- 2007-03-20 WO PCT/JP2007/055618 patent/WO2007122941A1/ja not_active Ceased
- 2007-04-19 TW TW096113848A patent/TW200801605A/zh not_active IP Right Cessation
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015050075A1 (ja) * | 2013-10-03 | 2015-04-09 | 住友化学株式会社 | 偏光板のセット及び前面板一体型液晶表示パネル |
| WO2015050074A1 (ja) * | 2013-10-03 | 2015-04-09 | 住友化学株式会社 | 偏光板のセット及び前面板一体型液晶表示パネル |
| JP2015072384A (ja) * | 2013-10-03 | 2015-04-16 | 住友化学株式会社 | 偏光板のセット及び前面板一体型液晶表示パネル |
| JP2015072385A (ja) * | 2013-10-03 | 2015-04-16 | 住友化学株式会社 | 偏光板のセット及び前面板一体型液晶表示パネル |
| US9606394B2 (en) | 2013-10-03 | 2017-03-28 | Sumitomo Chemical Company, Limited | Set of polarizing plates and front-plate-integrated liquid crystal display panel |
| US9606395B2 (en) | 2013-10-03 | 2017-03-28 | Sumitomo Chemical Company, Limited | Set of polarizing plates and front-plate-integrated liquid crystal display panel |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101356472A (zh) | 2009-01-28 |
| EP2012174A4 (en) | 2009-11-04 |
| JP5268234B2 (ja) | 2013-08-21 |
| EP2012174A1 (en) | 2009-01-07 |
| US7812902B2 (en) | 2010-10-12 |
| KR20080040003A (ko) | 2008-05-07 |
| CN101356472B (zh) | 2010-06-23 |
| US20100157205A1 (en) | 2010-06-24 |
| JP2007292966A (ja) | 2007-11-08 |
| KR100957486B1 (ko) | 2010-05-14 |
| TW200801605A (en) | 2008-01-01 |
| TWI341401B (ja) | 2011-05-01 |
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