WO2007138838A1 - 液晶パネル及び液晶表示装置 - Google Patents
液晶パネル及び液晶表示装置 Download PDFInfo
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- WO2007138838A1 WO2007138838A1 PCT/JP2007/059744 JP2007059744W WO2007138838A1 WO 2007138838 A1 WO2007138838 A1 WO 2007138838A1 JP 2007059744 W JP2007059744 W JP 2007059744W WO 2007138838 A1 WO2007138838 A1 WO 2007138838A1
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- WIPO (PCT)
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- liquid crystal
- polarizing plate
- polarizer
- crystal panel
- crystal cell
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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
- G02F1/1337—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers
-
- 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
- G02B27/281—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising used for attenuating light intensity, e.g. comprising rotatable polarising elements
-
- 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
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/133528—Polarisers
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/13363—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 including a polarizing plate with adjusted transmittance and a retardation layer.
- a liquid crystal display device (hereinafter referred to as LCD) is a device that displays characters and images using the electro-optical characteristics of liquid crystal molecules.
- the LCD usually uses a liquid crystal panel in which polarizing plates are arranged on both sides of the liquid crystal cell. For example, in the normally black method, a black image can be displayed in a state where no voltage is applied. LCDs have the problem of low contrast ratios in the front and diagonal directions.
- a liquid crystal panel using a retardation film is disclosed (for example, see Patent Document 1).
- Patent Document 1 a liquid crystal panel using a retardation film
- the market is eagerly demanding higher LCD performance, and one of these is the need for a liquid crystal display device with a higher contrast ratio that can clearly draw characters and images. .
- Patent Document 1 Japanese Patent No. 3648240
- An object of the present invention is to provide a liquid crystal display device having a high contrast ratio in the front direction.
- the liquid crystal panel of the present invention comprises a liquid crystal cell
- a first polarizing plate disposed on one side of the liquid crystal cell
- a second polarizing plate disposed on the other side of the liquid crystal cell
- the transmittance (T) of the second polarizing plate is larger than the transmittance ( ⁇ ) of the first polarizing plate.
- the transmittance ( ⁇ ) of the second polarizing plate and the first polarizing plate are used.
- the difference ( ⁇ ⁇ ⁇ ) from the transmittance ( ⁇ ) of the optical plate is 0 ⁇ 1% 6.0 ⁇ 0%.
- the liquid crystal cell includes liquid crystal molecules aligned in a homeotopic pick alignment.
- the first polarizing plate is disposed on the viewing side of the liquid crystal cell, and the second polarizing plate is on the side opposite to the viewing side of the liquid crystal cell. It is arranged.
- the first polarizing plate includes a first polarizer
- the second polarizing plate includes a second polarizer
- the first polarizer and the second polarizer are
- the main component is polyvinyl alcohol resin containing iodine.
- the iodine content of the first polarizer and the second polarizer is 1.8% by weight to 5.0% by weight, respectively.
- the retardation value (Rth [590]) in the thickness direction at a wavelength of 590 nm of the retardation layer is 100 nm and 400 nm.
- the Nz coefficient of the retardation layer is more than 1.1 and not more than 8.
- the retardation layer is a retardation film containing a polyimide-based resin or a norbornene-based resin.
- a liquid crystal display device includes the liquid crystal panel.
- the liquid crystal display device including the liquid crystal panel of the present invention has a contrast ratio in the front direction as compared with a conventional liquid crystal panel by using two polarizing plates with adjusted transmittance and a retardation layer. Excellent display characteristics that are remarkably high.
- FIG. 1 is a schematic cross-sectional view of a liquid crystal panel in 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 (a) is a schematic diagram for explaining a planar aligned rod-like liquid crystal compound, and (b) is a schematic diagram for explaining a columnar aligned discotic liquid crystal compound.
- FIG. 4 is a schematic sectional view of a liquid crystal display device according to a preferred embodiment of the present invention.
- T transmittance
- C light source 2 degree field of view
- 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 orthogonal to the slow axis in the plane (ie, fast axis direction). “Nz” is the refractive index in the thickness direction.
- the retardation value in the thickness direction is the retardation value in the thickness direction of the film at 23 ° C and the wavelength ⁇ (nm).
- the birefringence ( ⁇ [ ⁇ ]) in the thickness direction is a value calculated by the formula: Rth [ ⁇ ] Zd.
- the Nz coefficient is a value calculated by the equation: Rth [590] ZRe [590].
- substantially orthogonal includes a case where the angle formed by two optical axes is 90 ° ⁇ 2 °, and preferably 90 ° ⁇ 1 °. “Substantially parallel” includes the case where the angle between two optical axes is 0 ° ⁇ 2 °, preferably 0 ° ⁇ 1 ° It is.
- the liquid crystal panel of the present invention includes a liquid crystal cell, a first polarizing plate disposed on one side of the liquid crystal cell, a second polarizing plate disposed on the other side of the liquid crystal cell, and the first At least a retardation layer (A) disposed between the polarizing plate and the second polarizing plate.
- the retardation layer (A) the refractive index ellipsoid shows a relationship of nx ⁇ ny> nz.
- the transmittance (T) of the second polarizing plate is larger than the transmittance (T) of the first polarizing plate.
- the contrast ratio in the front direction is remarkably high.
- the present inventors have seen for the first time that the contrast ratio in the front direction is greatly improved by using two polarizing plates with adjusted transmittances on both sides of the liquid crystal cell and the retardation layer. This is a knowledge that has been released and is an unexpectedly superior effect.
- T— ⁇ T— ⁇ is preferably 0.1% to 6.0%, more preferably 0.1% to 4.5%.
- the liquid crystal panel of the present invention can obtain a liquid crystal display device having a higher contrast ratio in the front direction.
- FIG. 1 is a schematic cross-sectional view of a liquid crystal panel of the present invention.
- 1 includes a liquid crystal cell 10, a first polarizing plate 21 disposed on one side of the liquid crystal cell 10, and a second polarizing plate 22 disposed on the other side of the liquid crystal cell 10. And at least a retardation layer 30 disposed between the liquid crystal cell 10 and the second polarizing plate 22.
- the first polarizing plate 21 is on the upper side and the second polarizing plate 22 is on the lower side.
- the liquid crystal panel of the present invention is an inverted version of this configuration. There may be.
- the liquid crystal panel is preferably of a normally black type.
- the “normally black method” is designed so that the transmittance is minimized when no voltage is applied (the screen turns black) and the transmittance is increased when a voltage is applied.
- a liquid crystal panel. The effect of improving the front contrast ratio is particularly noticeable in a normally black liquid crystal panel that displays black when no voltage is applied. This is because the effect obtained by using two polarizing plates with different transmittances is not hindered by the driving of liquid crystal molecules.
- 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 used in a one-part isotropic nematic liquid crystal display device.
- the liquid crystal cell preferably has a pair of substrates and a liquid crystal layer as a display medium sandwiched between the pair of substrates.
- One substrate active matrix substrate
- switching elements typically TFTs
- scanning lines that supply gate signals to the switching elements and signal lines that supply source signals.
- the other substrate color filter substrate
- the other substrate is provided with a color filter.
- the color filter may be provided on the active matrix substrate! is there! / ⁇ means that when an RGB three-color light source (and may include multi-color light sources) is used as the illumination means of the liquid crystal display as in the field sequential method, the above color filter can be omitted.
- the distance between the two substrates is controlled by a spacer.
- an alignment film made of polyimide is provided on the side of each substrate in contact with the liquid crystal layer.
- the alignment film can be omitted.
- the liquid crystal cell preferably includes liquid crystal molecules aligned in a homeo-mouth pick alignment.
- “homeotopic pick alignment” means the alignment vector force of liquid crystal molecules. As a result of the interaction between the alignment processed substrate and the liquid crystal molecules, it is aligned perpendicular to the substrate plane (in the normal direction). It means the state.
- the above-mentioned home-to-mouth pick arrangement is based on the orientation of liquid crystal molecules. It includes the case where the liquid crystal molecules are slightly tilted with respect to the direction of the normal of the substrate, that is, the liquid crystal molecules have a pretilt.
- the pretilt angle angle from the substrate normal
- the pretilt angle is preferably 5 ° or less.
- the liquid crystal cell is in a vertical alignment (HVA) mode.
- the VA mode liquid crystal cell utilizes a voltage-controlled birefringence effect, and in the absence of an electric field, liquid crystal molecules aligned in a home-to-mouth pick alignment in a normal direction with respect to the substrate. Respond with an electric field.
- the liquid crystal molecules are not present in the absence of an electric field. Since it is oriented in the normal direction with respect to the substrate, black display is obtained when the upper and lower polarizing plates are arranged orthogonally.
- the liquid crystal molecules operate so as to tilt in a 45 ° azimuth direction with respect to the absorption axis of the polarizing plate, thereby increasing the transmittance and obtaining a white display.
- the liquid crystal cell in the VA mode can be obtained by using a substrate in which a slit is formed on an electrode or a substrate on which a protrusion is formed, as described in, for example, JP-A-11-258605. It may be multi-domain.
- Such liquid crystal cells include, for example, Sharp's ASV (Advanced Super View) mode, CPA (Continuous Pinwheel Alignment) mode, Fujitsu's MVA (Multi-domain Vertical Alignment) mode, and Samsung Electronics.
- Examples include PVA (Patterned Vertical Alignment) mode manufactured by Co., Ltd., EVA (Enhanced Vertical Alignment) mode manufactured by the same company, SURVIVAL (Super Ranged Viewing by Vertical Alignment) mode manufactured by Sanyo Electric Co., Ltd., and the like.
- Rth [590] of the above liquid crystal cell in the absence of an electric field is preferably 5 OOnm to 1200nm, more preferably 1400nm to 1200nm. Rth [590] is appropriately set depending on the birefringence of the liquid crystal molecules and the cell gap. the above
- the cell gap (substrate interval) of the liquid crystal cell is usually 1.0 / ⁇ ⁇ to 7. O / z m.
- liquid crystal cell a liquid crystal cell mounted on a commercially available liquid crystal display device may be used as it is.
- Commercially available liquid crystal display devices including VA mode liquid crystal cells include, for example, SHARP Corporation LCD TV product name “AQUOS Series”, Sony LCD TV product name “BRAVIA Series”, and SUMSUNG 32V type.
- polarizing plate refers to a material that converts natural light or polarized light into linearly polarized light.
- the polarizing plate has a function of separating incident light into two orthogonal polarization components, transmitting one polarization component, and absorbing, reflecting, and Z or scattering the other polarization component.
- the first polarizing plate is disposed on a viewing side of the liquid crystal cell
- the second polarizing plate is disposed on a side opposite to the viewing side of the liquid crystal cell.
- High brightness white luminance
- the luminance black luminance
- the absorption axis direction of the first polarizing plate is substantially perpendicular to the absorption axis direction of the second polarizing plate.
- 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 usually 1 ⁇ to 250 / ⁇ m, preferably 20 m to 250 / ⁇ ⁇ . 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 single layer having a polarizing function (also referred to as a polarizer), or may be a laminate composed of a plurality of layers.
- the polarizing plate When the polarizing plate is a laminate, examples of the configuration thereof include (a) a laminate including a polarizer and a protective layer (for example, the configuration of Examples), and (b) a polarizer and a protective layer. And a laminate including a surface treatment layer, and (c) a laminate including two or more polarizers.
- the polarizing plate may have two or more surface treatment layers.
- the transmittance (T) of the first polarizing plate is preferably 38.3% to 43.3%, more preferably 38.6% to 43.2%, and particularly preferably. Is from 38.9% to 43.1%, most preferably from 39.2% to 43.0%.
- the transmittance (T) of the second polarizing plate is preferably 41.1% to 44.3%, more preferably
- T it is preferably 41.4% to 44.3%, particularly preferably 41.7% to 44.2%, and most preferably 42.0% to 44.2%.
- a liquid crystal display device having a high contrast ratio in the surface direction can be obtained.
- the liquid crystal panel of the present invention can be produced by, for example, selecting commercially available polarizing plates having different transmittances and combining them appropriately.
- the liquid crystal panel of the present invention is produced by appropriately adjusting the transmittance of the polarizing plate so as to increase the contrast ratio in the front direction in accordance with the driving mode and application of the liquid crystal cell.
- a method for increasing or decreasing the transmittance of the polarizing plate for example, when a polarizer mainly composed of polyvinyl alcohol-based resin containing iodine is used for the polarizing plate,
- the method of adjusting the content of iodine is included. Specifically, increasing the iodine content in the polarizer can lower the transmittance of the polarizing plate, and decreasing the iodine content in the polarizer increases the transmittance of the polarizing plate. can do.
- This method can be applied to both the production of a roll-shaped polarizing plate and the production of a polarizing plate for each leaf. The polarizer will be described later.
- the degree of polarization (P) of the first polarizing plate and Z or the second polarizing plate is preferably 99% or more, more preferably 99.5% or more, and still more preferably 99. 8%.
- the degree of polarization can be measured using a spectrophotometer [product name “DOT-3” manufactured by Murakami Color Research Laboratory Co., Ltd.].
- DOT-3 a spectrophotometer
- the first polarizing plate includes a first polarizer
- the second polarizing plate includes a second polarizer
- the first polarizer and the second polarizer are respectively
- the main component is polybulal alcoholic resin containing iodine.
- the polarizer can be usually obtained by stretching a polymer film containing as a main component a polyvinyl alcohol-based resin containing iodine.
- a polarizing plate including such a polarizer has excellent optical characteristics.
- % By weight, more preferably 0.1% by weight to 2.0% by weight, particularly preferably 0.1% by weight to 1.4% by weight, and most preferably 0.15% by weight to 0. 8% by weight.
- the iodine content of each of the first polarizer and the second polarizer is preferably 1.8% by weight to 5.0% by weight, and more preferably 2.0% by weight to 4%. 0% by weight.
- the iodine content of the first polarizer is preferably 2.3% to 5.0% by weight, more preferably 2.5% to 4.5% by weight, and particularly preferably. 2. 5% to 4.0% %.
- the iodine content of the second polarizer is preferably 1.8% to 3.5% by weight, more preferably 1.9% to 3.2% by weight, and particularly preferably 2. 0% by weight to 2.9% by weight.
- the first polarizer and the second polarizer each further contain potassium.
- the potassium content is preferably 0.2 wt% to 1.0 wt%, more preferably 0.3 wt% to 0.9 wt%, and particularly preferably 0.4 wt% to 0 wt%. 8% by weight.
- each of the first polarizer and the second polarizer further contains boron.
- the boron content is preferably 0.5 wt% to 3.0 wt%, more preferably 1.0 wt% to 2.8 wt%, and particularly preferably 1.5 wt% to 2. 6% by weight.
- the polybula alcohol-based resin can be obtained by saponifying a vinyl ester polymer obtained by polymerizing a butyl ester monomer.
- the degree of saponification 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 can be appropriately selected depending on the purpose.
- the average degree of polymerization is preferably 1200 to 3600.
- the average degree of polymerization can be determined according to JIS 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 mainly composed of the above-mentioned butyl alcohol polymer is preferably acceptable.
- the plasticizer include polyhydric alcohols such as ethylene glycol and glycerin.
- the surfactant include nonionic surfactants.
- the content of the plasticizer and the surfactant is preferably more than 1 and 10 parts by weight with respect to 100 parts by weight of the butyl alcohol polymer.
- the polyhydric alcohol and the surfactant are used for the purpose of further improving the dyeability and stretchability of the polarizer.
- a commercially available film can be used as it is for the polymer film containing polybulal alcohol-based resin as a main component.
- Examples of polymer films based on commercially available polyvinyl alcohol-based resin include Kuraray Co., Ltd., trade name “Kuraray-Lon Film”, Tosero Co., Ltd., trade name “Tosero Vinylon Film”, Product name “Nippon Vinylon Film” manufactured by Nippon Synthetic Chemical Industry Co., Ltd.
- 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 301 mainly composed of polyvinyl alcohol-based resin is fed from a feeding unit 300 and immersed in a swelling bath 310 containing pure water and a dyeing bath 320 containing an aqueous iodine solution.
- the rolls 311, 312, 321 and 322 are subjected to swelling treatment and dyeing treatment while tension is applied in the longitudinal direction of the film.
- the film subjected to the swelling treatment and the dyeing treatment is dipped in the first crosslinking bath 330 containing potassium iodide and the second crosslinking bath 340, and rolls 331, 332, 341 and 342 having different speed ratios are immersed.
- a cross-linking treatment and a final stretching treatment are performed while tension is applied in the longitudinal direction of the film.
- the film subjected to the crosslinking treatment is immersed in a washing bath 350 containing pure water by rolls 351 and 352 and subjected to washing treatment.
- the water-washed film is dried by the drying means 360 so that the moisture content is adjusted to, for example, 10% to 30% and wound up by the winding unit 380.
- the polarizer 370 can be obtained by stretching the polymer film containing the polyvinyl alcohol-based resin as a main component to 5 to 7 times the original length.
- the amount of iodine added to the dyeing bath is preferably 0.01 to 0.15 parts by weight, more preferably 0.01 parts by weight with respect to 100 parts by weight of water. Parts to 0.05 parts by weight.
- optical properties can be improved.
- An excellent polarizing plate can be obtained.
- the amount of iodine added to the dyeing bath is increased within the above range, a polarizing plate having a low transmittance can be obtained as a result.
- the amount of iodine added to the coloring bath is decreased within the above range, as a result, a polarizing plate with high transmittance can be obtained.
- the amount of potassium iodide added to the dyeing bath is preferably 0.05 to 0.5 parts by weight, more preferably 0.1 parts by weight to 100 parts by weight of water. 0.3 parts by weight.
- the amount of potassium iodide added in the first crosslinking bath and the second crosslinking bath is preferably 0.5 to 10 parts by weight with respect to 100 parts by weight of water. More preferably, it is 1 to 7 parts by weight.
- the amount of added boric acid in the first crosslinking bath and the second crosslinking bath is preferably 0.5 to 10 parts by weight, more preferably 1 to 7 parts by weight.
- the polarizing plate used in the present invention preferably includes at least a polarizer and protective layers disposed on both sides of the polarizer.
- the protective layer can prevent, for example, the polarizer from contracting or expanding, or can prevent deterioration due to ultraviolet rays, and a highly durable polarizing plate can be obtained.
- the first polarizing plate is preferably a first polarizer, a first protective layer disposed on the liquid crystal cell side of the first polarizer, and the first polarizer. And at least a second protective layer disposed on the opposite side of the liquid crystal cell side of the first polarizer.
- the second polarizing plate is preferably a second polarizer, a third protective layer disposed on the liquid crystal cell side of the second polarizer, and the liquid crystal cell side of the second polarizer. And at least a fourth protective layer disposed on the opposite side.
- the protective layer and the polarizer can be laminated via any appropriate adhesive layer.
- adhesive layer refers to the practical use of joining the surfaces of adjacent optical members. The one that is integrated with sufficient adhesive strength and bonding time.
- the material for forming the adhesive layer include an adhesive and an anchor coat agent.
- the adhesive layer may have a multilayer structure in which an anchor coat layer is formed on the surface of the adherend and an adhesive layer is formed thereon. Further, it may be a thin layer (also referred to as a hairline) that cannot be visually recognized.
- a material for forming the adhesive layer is preferably a water-soluble adhesive.
- the water-soluble adhesive is preferably a water-soluble adhesive mainly composed of polybulal alcohol-based resin.
- a commercially available adhesive can be used as it is for the adhesive layer.
- a commercially available adhesive may be mixed with a solvent or an additive.
- an adhesive mainly composed of a commercially available polyvinyl alcohol-based resin for example, “GOHS FEIMER Z200” manufactured by Nippon Synthetic Chemical Industry Co., Ltd. may be mentioned.
- the water-soluble adhesive may further contain a crosslinking agent as an additive.
- the crosslinking agent include amine compounds, aldehyde compounds, methylol compounds, epoxy compounds, isocyanate compounds, and polyvalent metal salts.
- a commercially available crosslinking agent can be used as it is.
- As a commercially available crosslinking agent Nippon Synthetic Chemical Industry Co., Ltd. Aldehyde compound trade name “Darioxazal” can be mentioned.
- the addition amount of the crosslinking agent can be appropriately adjusted according to the purpose, but is usually more than 0 and 10 parts by weight or less with respect to 100 parts by weight of the solid content of the water-soluble adhesive.
- the first protective layer is disposed on the liquid crystal cell side of the first polarizer.
- the thickness of the first protective layer can be appropriately selected depending on the purpose.
- the thickness of the first protective layer is preferably 20 ⁇ m to 100 ⁇ m.
- the transmittance (T [590]) at a wavelength of 590 nm of the first protective layer is preferably 90% or more.
- the first protective layer is disposed between the polarizer and the liquid crystal cell, the optical characteristics may affect the display characteristics of the liquid crystal display device. Therefore, it is preferable to use the first protective layer having an appropriate retardation value.
- Re [590] and Rth [590] of the first protective layer are both less than lOnm.
- the protective layer is a polymer film containing a cellulose-based resin, a norbornene-based resin, or an acrylic resin.
- the polymer film containing the cellulose-based resin can be obtained, for example, by the method described in Example 1 of JP-A-7-112446.
- the polymer film containing the norbornene-based resin can be obtained, for example, by the method described in JP-A No. 2001-350017.
- the polymer film containing the acrylic resin can be obtained, for example, by the method described in Example 1 of JP-A-2004-198952.
- the second protective layer is disposed on the side opposite to the liquid crystal cell side of the first polarizer. Any appropriate layer can be adopted as the second protective layer.
- the thickness of the second protective layer is preferably 20 ⁇ m to 100 ⁇ m.
- the transmittance (T [590]) at a wavelength of 590 nm of the second protective layer is preferably 90% or more.
- the protective layer is a polymer film containing a cellulose-based resin, a norbornene-based resin, or an acrylic resin.
- the surface of the second protective layer may be subjected to any appropriate surface treatment as long as the relationship of transmittance is satisfied.
- 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.
- Surface treatment includes diffusion treatment (anti-glare treatment), anti-reflection treatment (anti-reflection treatment), hard coat treatment, anti-static treatment Processing and the like.
- Examples of commercially available diffusion-treated (anti-glare-treated) products include AG150, AGS1, AGS2, and AGT1 manufactured by Nitto Denko Corporation.
- anti-reflective treatment anti-reflection treatment
- examples of the commercially available film that has been subjected to the hard coat treatment and the antistatic treatment include “KC8UX-HA”, a trade name manufactured by Co-Caminoltop Co., Ltd.
- a surface treatment layer may be provided on the side of the second protective layer opposite to the side provided with the first polarizer. Any appropriate layer can be adopted as the surface treatment layer depending on the purpose. Examples include a diffusion treatment (antiglare treatment) layer, an antireflection treatment (antireflection treatment) layer, a hard coat treatment layer, an antistatic treatment layer, and the like. These surface treatment layers are used to prevent the screen from becoming dirty or damaged, or to prevent the display image from becoming difficult to see due to the appearance of indoor fluorescent light or sunlight on the screen. .
- As the surface treatment layer generally used is a layer obtained by fixing the treatment agent for forming the treatment layer on the surface of the base film.
- the base film may also serve as the second protective layer.
- the surface treatment layer may have a multilayer structure in which, for example, a hard coat treatment layer is laminated on the antistatic treatment layer.
- a hard coat treatment layer is laminated on the antistatic treatment layer.
- Examples of the commercially available surface-treated layer that has been subjected to antireflection treatment include ReaLook series manufactured by NOF Corporation.
- the third protective layer is disposed on the liquid crystal cell side of the second polarizer.
- an appropriate layer can be adopted as appropriate from the materials, characteristics, conditions, and the like described in the first protective layer.
- the first protective layer and the third protective layer may be the same or different.
- the fourth protective layer is disposed on the side opposite to the liquid crystal cell side of the second polarizer.
- an appropriate layer can be adopted as appropriate from the materials, characteristics, conditions, etc. described in the second protective layer.
- the second protective layer and the fourth protective layer may be the same or different.
- the retardation layer used in the present invention is disposed between the first polarizing plate and the second polarizing plate.
- the retardation layer is disposed between the liquid crystal cell and the second polarizing plate.
- the second polarizing plate is disposed on the side opposite to the viewing side of the liquid crystal cell. In such a configuration, a liquid crystal display device with a higher contrast ratio in the front direction can be obtained.
- the “retardation layer” refers to a transparent layer having a retardation in the plane and in the Z or thickness direction.
- the in-plane and Z or thickness direction retardation values of the retardation layer at a wavelength of 590 nm are lOnm or more.
- the thickness of the retardation layer is preferably 0.5 ⁇ m to 200 ⁇ m.
- the transmittance (T [590]) at the wavelength 59 Onm of the retardation layer is preferably 90% or more.
- the retardation layer is disposed between the liquid crystal cell and the second polarizing plate.
- the slow axis direction of the retardation layer is substantially perpendicular to the absorption axis direction of the adjacent polarizer. Therefore, when the retardation layer is disposed between the liquid crystal cell and the second polarizing plate, the slow axis direction of the retardation layer is the absorption axis direction of the second polarizer. It is preferably substantially orthogonal.
- the refractive index ellipsoid of the retardation layer shows a relationship of nx ⁇ ny> nz.
- the retardation layer has a refractive index ellipsoid showing a relationship of nx> ny> nz. Because a liquid crystal cell can be highly compensated by simply placing one retardation layer between the first polarizer and the second polarizer, a thin and low-cost liquid crystal panel can be obtained. is there. In addition, since the number of retardation layers stacked is small, the slow axis of the retardation layer is less likely to be shifted to a desired position force, and a liquid crystal display device with a higher contrast ratio in the front direction can be obtained. A liquid crystal panel that compensates using only one retardation layer is also referred to as a “single-compensation liquid crystal panel”.
- Re [590] of the retardation layer is less than lOnm, preferably 5 nm or less.
- Re [590] of the retardation layer is 10 ⁇ m or more, preferably 20 nm to 80 nm, more preferably 30nm ⁇ 70nm Particularly preferred is 30 nm to 60 nm.
- Rth [590] of the retardation layer can be appropriately set according to the retardation value in the thickness direction of the liquid crystal cell.
- Rth [590] is preferably 100 nm to 400 nm, more preferably 150 nm to 350 nm, and particularly preferably 150 nm to 300 nm.
- the refractive index ellipsoid of the retardation layer shows a relationship of nx> ny> nz
- Rth [590] is larger than Re [590]. That is, the Nz coefficient of the retardation layer is greater than 1.
- the Nz coefficient is preferably more than 1.1 and 8 or less, more preferably 2 to 7, and particularly preferably 3 to 6.
- the retardation layer is preferably a retardation film containing a polyimide-based resin or a norbornene-based resin.
- the retardation film can be made very thin.
- the thickness of the retardation film containing the polyimide resin is preferably 0.5 ⁇ to 10 / ⁇ ⁇ , and more preferably 1 ⁇ m to 5 ⁇ m.
- the birefringence ( ⁇ ⁇ [590]) in the thickness direction of the retardation film containing the polyimide-based resin is preferably 0.01-01.12, more preferably 0.002-0.08. It is.
- Such a polyimide system can be obtained by the method described in US Pat. No. 5,344,916.
- the polyimide-based resin has a hexafluoroisopropylidene group and a Z or trifluoromethyl group. More preferably, the polyimide-based resin has at least a repeating unit represented by the following general formula (I) or a repeating unit represented by the following general formula ( ⁇ ). Polyimide-based resins containing these repeating units are excellent in transparency and solubility in general-purpose solvents, and have a large birefringence index in the thickness direction.
- G and G ′ are a covalent bond, a CH group, a C (CH 3) group, C (CF
- C (CX) group (where X is a halogen), CO group, O atom, S atom, so group
- Si (CH 2 CH 3) group, and N (CH 2) group are independently selected from the group
- L is a substituent, and e represents the number of substitutions.
- L is, for example, halogen, an alkyl group having 1 to 3 carbon atoms, a halogenated alkyl group having 1 to 3 carbon atoms, a phenol group, or a substituted phenol group, and in a plurality of cases, they are the same. Or different.
- e is an integer up to 0 force 3.
- Q is a substituent, and f represents the number of substitutions.
- Q includes, for example, hydrogen, halogen, alkyl group, substituted alkyl group, nitro group, cyano group, thioalkyl group, alkoxy group, aryl group, substituted aryl group, alkyl ester group, and substituted alkyl ester group strength.
- f is an integer from 0 to 4
- g and h are integers from 1 to 3, respectively.
- the polyimide-based resin can be obtained, for example, by a reaction between tetracarboxylic dianhydride and diamine.
- the repeating unit of the general formula (I) includes, for example, 2,2,1bis (trifluoromethyl) 4,4, -diaminobiphenyl as diamine and a tetracarboxylic acid having at least two aromatic rings. It can be obtained by reaction with dianhydride.
- the repeating unit of the above general formula ( ⁇ ) is, for example, using 2,2-bis (3,4-dicarboxyphenol) hexafluoropropanoic dianhydride as tetracarboxylic dianhydride, It can be obtained by reacting this with a diamine having at least two aromatic rings.
- the reaction may be, for example, a chemical imidization that proceeds in two stages, or a thermal imidization that proceeds in one stage.
- any appropriate tetracarboxylic dianhydride may be selected.
- examples of the tetracarboxylic dianhydride include 2,2 bis (3,4 dicarboxyphenol) hexafluoropropanoic dianhydride, 3, 3 ', 4, 4' monobenzo.
- any appropriate one can be selected.
- the diamine include 2, 2 ′ bis (trifluoromethyl) 4,4′-diaminobiphenyl, 4,4′-diaminobifu Engineering, 4, 4, 1-diaminophenol methane, 4, 4, 1 (9-fluoreureidene) 1-dianiline, 3, 3, -dichloro-4,4'-diaminodiphenylmethane, 2,2'-dichloro-4 4,4'-diaminodiphenyl ether, 4,4'-diaminodiphenyl ether, 3,4'-diaminodiphenyl ether, 4,4'-diaminodiphenylsulfone, 4,4'-diaminodiphenylthioether, etc. It is done.
- the polyimide-based resin is a polyethylene oxide standard solution using a dimethylformamide solution (a solution containing 10 mM lithium bromide and 10 mM phosphoric acid added to make a 1 L dimethylformamide solution) as a developing solvent.
- Weight average molecular weight (Mw) force Preferably it is 20,00 0-180,000.
- Imidation rate power is preferably 95% or more.
- the imidization ratio can be determined from an integral intensity ratio between a proton peak derived from polyamic acid, which is a polyimide precursor, and a proton peak derived from polyimide.
- the retardation film containing the polyimide-based resin can be obtained by any appropriate forming method.
- the retardation film containing the polyimide-based resin is prepared by stretching a polymer film formed into a sheet shape by a solvent casting method by a longitudinal uniaxial stretching method or a lateral uniaxial stretching method.
- the temperature at which the polymer film is stretched is preferably 120 ° C to 200 ° C.
- the magnification (stretching ratio) for stretching the polymer film is preferably more than 1 and not more than 3 times.
- C [590] of the norbornene-based rosin is preferably 1 ⁇ 10 — 12 to 20 ⁇ 10 — 12 , more preferably 1 ⁇ 10 — 12 to: LO X 10 — 12 .
- the term “norbornene-based resin” refers to a (co) polymer obtained by using a norbornene-based monomer having a norbornene ring as a part or all of a starting material (monomer).
- the “(co) polymer” represents a homopolymer or a copolymer (copolymer).
- a norbornene-based monomer having a norbornene ring (having a double bond in the norbornane ring) is used as a starting material.
- the norbornene-based resin may have a norbornane ring as a structural unit in the (co) polymer state. , Do not have to. (Co) in the state of the polymer, norbornene ⁇ that having a norbornane ring in a constituent unit, for example, tetracyclo [4. 4. I 2 '5. I 7' 10. 0] dec-one 3- E down , 8-methyl tetracyclo [4. 4.
- a norbornene-based resin having no norbornane ring as a structural unit in the (co) polymer state is, for example, a (co) polymer obtained using a monomer that becomes a 5-membered ring by cleavage.
- the monomer that becomes a 5-membered ring by the cleavage include norbornene, dicyclopentagen, 5-phenylnorbornene, and derivatives thereof.
- the norbornene-based resin is a copolymer
- the arrangement state of the molecule may be a random copolymer without any particular limitation, a block copolymer, or a graft copolymer. May be
- Examples of the norbornene-based resin include (A) a resin obtained by hydrogenating a ring-opening (co) polymer of a norbornene-based monomer, and (B) a copolymer (co) polymerized with a norbornene-based monomer.
- Examples include resin.
- the ring-opening copolymer of the norbornene-based monomer is a resin obtained by hydrogenating a ring-opening copolymer of one or more norbornene-based monomers and a-olefins, cycloalkenes, and Z or non-conjugated genes. Is included.
- a resin obtained by addition copolymerization of the norbornene monomer is obtained by adding an addition copolymer of at least one norbornene monomer and a-olefins, cycloalkenes and Z or non-conjugated gens. Include.
- the resin obtained by hydrogenating the ring-opening (co) polymer of the norbornene monomer is subjected to a metathesis reaction of the norbornene monomer or the like to obtain a ring-opening (co) polymer. It can be obtained by hydrogenating a ring (co) polymer.
- a ring (co) polymer for example, the method described in paragraphs [0059] to [0060] of JP-A-11-116780, the method described in paragraphs [0035] to [0037] of JP-A-2001-350017, etc. Is mentioned.
- the resin obtained by addition (co) polymerization of the norbornene monomer can be obtained, for example, by the method described in Example 1 of JP-A-61-292601.
- the weight average molecular weight (Mw) of the norbornene-based rosin is preferably a value measured by gel permeation chromatography method (polystyrene standard) using tetrahydrofuran solvent. Is from 20,000 to 500,000.
- the glass transition temperature (Tg) of the norbornene-based resin is preferably 120 ° C to 170 ° C. If it is said resin, the film which has the outstanding thermal stability and was excellent in the drawability can be obtained.
- the glass transition temperature (Tg) is a value calculated by the DSC method according to JIS K 7121.
- the retardation film containing the norbornene-based resin can be obtained by any appropriate forming method.
- the retardation film containing the norbornene-based resin is a polymer film formed into a sheet shape by a solvent casting method or a melt extrusion method, a horizontal uniaxial stretching method, a vertical and horizontal simultaneous biaxial stretching method, or a vertical and horizontal sequential method. It is produced by stretching by a biaxial stretching method.
- the temperature at which the polymer film is stretched is preferably 120 ° C to 200 ° C.
- the magnification (stretching ratio) for stretching the polymer film is preferably more than 1 and not more than 3 times.
- the retardation film may further contain any appropriate additive.
- the additives include plasticizers, heat stabilizers, light stabilizers, lubricants, antioxidants, ultraviolet absorbers, flame retardants, colorants, antistatic agents, compatibilizers, crosslinkers, and thickeners. Agents and the like.
- the content of the additive is preferably more than 0 and not more than 10 parts by weight with respect to 100 parts by weight of the norbornene-based resin.
- the retardation layer may be one using a liquid crystal composition! ⁇ .
- the retardation layer is a solidified layer or a cured layer of a liquid crystal composition containing a rod-like liquid crystal compound aligned in a planar alignment, or a discotic liquid crystal compound aligned in a columnar alignment.
- planar alignment means a state in which rod-like liquid crystal compounds (calamitic liquid crystal compounds) are aligned such that the helical axis of the liquid crystal is perpendicular to both substrate surfaces ( For example, see Figure 3 (a)).
- Coldar alignment refers to a state in which discotic liquid crystal compounds are arranged so as to overlap each other in a columnar shape (for example, see FIG. 3B).
- solidified layer refers to a solidified state in which a liquid crystalline composition in a softened, molten or solution state is cooled.
- “Curing layer” means that part or all of the liquid crystalline composition is composed of heat, a catalyst, A product that has been cross-linked by light and z or radiation to become a stable state of insoluble, infusible or hardly soluble.
- the said hardened layer includes what became a hardened layer via the solidified layer of a liquid crystalline composition.
- a retardation film having a solidified layer or a cured layer strength of a liquid crystalline composition containing a rod-like liquid crystal compound aligned in the planar arrangement is obtained, for example, by a method described in JP-A-2003-287623. be able to. Further, a retardation film composed of a solidified layer or a cured layer of a liquid crystalline composition containing a discotic liquid crystal compounded contaminant aligned in the above columnar arrangement can be obtained, for example, by the method described in JP-A-9-117983. You can.
- the polarizing plate (the first polarizing plate and the second polarizing plate) is attached to a liquid crystal panel via an adhesive layer.
- an appropriate adhesive and Z or an anchor coat agent can be selected according to the type and application of the adherend.
- Specific examples of adhesives include solvent type adhesives, emulsion type adhesives, pressure sensitive adhesives, rehumidifying adhesives, polycondensation type adhesives, solventless adhesives, and film-like adhesives according to the classification by shape. Examples thereof include an adhesive and a hot melt adhesive. Classification by chemical structure includes synthetic resin adhesives, rubber adhesives, and natural product adhesives.
- the adhesive includes a viscoelastic substance (also referred to as an adhesive) that exhibits an adhesive force that can be sensed by pressure contact at room temperature.
- the material forming the adhesive layer is a pressure-sensitive adhesive (also referred to as an acrylic pressure-sensitive adhesive) using an acrylic polymer as a base polymer.
- a pressure-sensitive adhesive also referred to as an acrylic pressure-sensitive adhesive
- acrylic polymer as a base polymer.
- the thickness of the acrylic pressure-sensitive adhesive layer can be appropriately adjusted according to the material and application of the adherend, but is usually 5 ⁇ m to 50 ⁇ m.
- 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 is arranged on the liquid crystal panel 100 and one side of the liquid crystal panel 100. And at least a backlight unit 80 placed thereon.
- the force indicates that the direct light system is adopted as the knocklight unit. For example, this may be a side light system.
- the backlight unit 80 preferably includes at least 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 further includes at least a light guide plate and a light reflector in addition to the above-described configuration.
- the optical member illustrated in FIG. 4 has a power or a part that can be omitted depending on the application, such as the illumination method of the liquid crystal display device and the drive mode of the liquid crystal cell, as long as the effect of the present invention is exhibited. 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 may be a transflective type having both transmissive and reflective properties.
- the liquid crystal display device of the present invention is used for any appropriate application.
- Applications include, for example, office equipment such as laptop monitors, notebook computers, and copy machines, mobile phones, watches, digital cameras, personal digital assistants (PDAs), portable devices such as portable game consoles, video cameras, televisions, and electronic devices.
- Household electrical equipment such as range, knock monitor, car navigation system monitor, in-car equipment such as car audio, display equipment such as information monitor for commercial stores, security equipment such as monitoring monitor, nursing monitor, Nursing care equipment such as medical monitors.
- the use of the liquid crystal display device of the present invention is a television.
- the screen size of the TV is preferably a wide 17 type (373 mm X 224 mm) or more, more preferably a wide 23 type (499 mm X 300 mm) or more, and particularly preferably a wide 32 type (687 mm X 41 2 mm). That's it.
- T transmittance
- C light source 2 degree field of view
- the content of each element was determined from a calibration curve prepared in advance using a standard sample from the X-ray intensity of a circular sample with a diameter of 10 mm measured under the following conditions by fluorescent X-ray analysis.
- X-ray fluorescence analyzer manufactured by Rigaku Denki Kogyo Co., Ltd.' 'ZSX100e' 'Anti-cathode: Rhodium
- Measurement was performed at 23 ° C. using a product name “KOBRA21—ADH” manufactured by Oji Scientific Instruments.
- a value measured using an Abbe refractometer [product name “DR-M4” manufactured by Atago Co., Ltd.] was used.
- Polyethylene oxide was calculated as a standard sample by the gel “permeation” chromatograph (GPC) method.
- the equipment, instruments and measurement conditions are as follows.
- Sample A 0.1 wt% solution was prepared by dissolving the sample in the eluent. 'Pretreatment: After standing for 8 hours, it was filtered through a 0.45 m membrane filter.
- 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 is
- a differential scanning calorimeter [product name “DSC-6200” manufactured by Seiko Co., Ltd.], it was determined by a method according to JIS K 71 21 (1987) (Method for measuring plastic transition temperature). Specifically, a 3 mg powder sample was heated (caro) under a nitrogen atmosphere (gas flow rate; 80 mlZ min). Heat rate: 10 ° CZ min) was measured twice and the second data was adopted. The calorimeter was temperature corrected using a standard material (indium).
- the sample (size 2cmX10cm) is clamped at both ends and stress (5-15N) is applied to the phase difference value at the center of the sample. (23 ° CZ wavelength 590 nm) was measured, and the slope of the function of stress and phase difference value was calculated.
- the lens was placed at a position 50 cm above the panel, and white and black images were displayed.
- the Y value of the XYZ display system was measured.
- the contrast ratio “YW ZYB” in the front direction was calculated from the Y value in the white image (YW: white luminance) and the Y value in the black image (YB: black luminance).
- a polymer film (trade name “VF—PS # 7500”, manufactured by Kuraray Co., Ltd.), which is mainly composed of 75 ⁇ m-thick polybulal alcohol-based resin, is used in 5 baths under the following conditions [1]-[5] The film was dipped while applying tension in the longitudinal direction of the film, and stretched to 6.2 times the final length of the original film. This stretched film was dried for 1 minute in an air circulation drying oven at 40 ° C. to prepare a polarizer A.
- VF—PS # 7500 manufactured by Kuraray Co., Ltd.
- the characteristics of the polarizing plate A are shown in Table 1 below.
- Dyeing bath 0.032 parts by weight of iodine for 100 parts by weight of water and 100 parts by weight of water, 0. 30 ° C. aqueous solution containing 2 parts by weight of potassium iodide.
- First cross-linking bath 40 ° C. aqueous solution containing 3% by weight potassium iodide and 3% by weight boric acid.
- Second crosslinking bath 60 ° C. aqueous solution containing 5% by weight potassium iodide and 4% by weight boric acid.
- Washing bath 25 ° C aqueous solution containing 3% by weight potassium iodide.
- a polarizing plate B was produced under the same conditions and method as in Reference Example 1 except that the amount of iodine added under condition [2] in the dyeing bath was 0.031 parts by weight with respect to 100 parts by weight of water. .
- the characteristics of the polarizing plate B are shown in Table 1 below.
- a polarizing plate C was produced under the same conditions and method as in Reference Example 1 except that the amount of iodine added in condition [2] was 0.027 parts by weight with respect to 100 parts by weight of water in the dyeing bath. .
- the characteristics of the polarizing plate C are shown in Table 1 below.
- a solution prepared by dissolving 2.58 g (20 mmol) of isoquinoline in 275.21 g of m-taresol was prepared and stirred at 23 ° C. for 1 hour (600 rpm) to obtain a uniform solution.
- the reaction vessel was heated using an oil bath so that the temperature in the reaction vessel was 180 ° C. and 3 ° C., and stirred for 5 hours while maintaining the temperature to obtain a yellow solution. After further stirring for 3 hours, the heating and stirring were stopped, and the mixture was allowed to cool to room temperature.
- the polyimide powder was dissolved in methylisoptyl ketone to prepare a 15 wt% polyimide solution.
- This polyimide solution was uniformly cast into a sheet shape with a slot die coater on the surface of a triacetyl cellulose film (thickness: 80 m).
- the film is put into a multi-chamber air circulation drying oven, and the solvent is gradually raised from a low temperature of 80 ° C for 2 minutes, 135 ° C for 5 minutes, and 150 ° C for 10 minutes. Was evaporated.
- the film was stretched 1.14 times at 147 ° C. by a fixed-end lateral uniaxial stretching method using a tenter stretching machine.
- the triacetyl cellulose film was peeled off to obtain a 3.4 ⁇ m thick polyimide layer (retardation layer A).
- liquid crystal panel Take out the liquid crystal panel from a commercially available liquid crystal display device [Sony's 40-inch liquid crystal television product name “BRAVIA KDL-40X1000”], including the VA mode liquid crystal cell, and optical such as polarizing plates placed above and below the liquid crystal cell. All the film was removed.
- the liquid crystal cell A was obtained by washing the front and back of the glass plate of the liquid crystal cell.
- the polarizing plate A prepared in Reference Example 1 is used as the first polarizing plate on the viewing side of the liquid crystal cell A prepared in Reference Example 5.
- the absorption axis direction of the polarizing plate A is the long-side direction of the liquid crystal cell A.
- the absorption axis direction of the polarizing plate A is the long-side direction of the liquid crystal cell A.
- the retardation layer A prepared in Reference Example 4 is used as the retardation layer, and the slow axis direction of the retardation layer A is
- the liquid crystal cell A was attached via an acrylic pressure-sensitive adhesive (thickness 20 m) so as to be substantially parallel to the long side direction of the liquid crystal cell A.
- the polarizing plate B produced in Reference Example 2 is used as the second polarizing plate, and the absorption axis direction of the polarizing plate B is the long side of the liquid crystal cell A.
- Adhesion was carried out through an acrylic adhesive (thickness 20 m) so as to be substantially perpendicular to the direction.
- the absorption axis direction of the first polarizing plate and the absorption axis direction of the second polarizing plate are substantially perpendicular to each other.
- the slow axis direction of the retardation layer A is substantially perpendicular to the absorption axis direction of the second polarizing plate.
- This liquid crystal panel A was combined with the backlight unit of the original liquid crystal display device to produce liquid crystal display device A.
- Table 2 The properties of the obtained liquid crystal display device A are shown in Table 2 below.
- a liquid crystal panel B and a liquid crystal display device B were prepared in the same manner as in Example 1 except that the polarizing plate C prepared in Reference Example 3 was used as the second polarizing plate.
- the properties of the obtained liquid crystal display device B are shown in Table 2 below.
- Example 1 A liquid crystal panel H and a liquid crystal display device H were produced in the same manner as in Example 1 except that the polarizing plate C produced in Reference Example 3 was used as the first polarizing plate and the second polarizing plate. .
- the properties of the obtained liquid crystal display device H are shown in Table 2 below.
- a liquid crystal panel I and a liquid crystal display device I were prepared in the same manner as in Example 1 except that the polarizing plate B prepared in Reference Example 2 was used as the first polarizing plate.
- the properties of the obtained liquid crystal display device I are shown in Table 2 below.
- a polarizing plate C prepared in Reference Example 3 was used as the first polarizing plate, and the polarizing plate A prepared in Reference Example 1 was used as the second polarizing plate.
- a liquid crystal panel J and a liquid crystal display device were prepared. The properties of the obtained liquid crystal display device g [are shown in Table 2 below.
- Example 2 Except for using the polarizing plate B prepared in Reference Example 2 as the first polarizing plate and using the polarizing plate A prepared in Reference Example 1 as the second polarizing plate, the same method as in Example 1 was used. A liquid crystal panel K and a liquid crystal display device K were produced. The characteristics of the obtained liquid crystal display device K are shown in Table 2 below.
- the liquid crystal display device including the liquid crystal panel of the present invention has a phase difference.
- the transmittance (T) of the second polarizing plate is larger than the transmittance (T) of the first polarizing plate.
- the contrast ratio in the front direction was much higher than that using a conventional liquid crystal panel.
- the second polarizing plate has a transmittance (T) equal to the transmittance of the first polarizing plate (T), or the second polarizing plate.
- the contrast ratio in the front direction was low.
- the liquid crystal panel of the present invention exhibits a high contrast ratio in the front direction when used in a liquid crystal display device, it is extremely useful for improving display characteristics of, for example, a liquid crystal television, a personal computer monitor, and a mobile phone. is there.
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Abstract
Description
Claims
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CN2007800007278A CN101331424B (zh) | 2006-05-29 | 2007-05-11 | 液晶面板及液晶显示装置 |
US12/067,696 US7812901B2 (en) | 2006-05-29 | 2007-05-11 | Liquid crystal panel and liquid crystal display apparatus |
KR1020097023770A KR101335056B1 (ko) | 2006-05-29 | 2007-05-11 | 액정 패널 및 액정 표시 장치 |
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JP5570760B2 (ja) * | 2008-06-24 | 2014-08-13 | 日東電工株式会社 | 液晶パネルおよび液晶表示装置 |
KR20100009473A (ko) * | 2008-07-18 | 2010-01-27 | 주식회사 엘지화학 | 편광판 및 액정표시장치 |
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2007
- 2007-05-11 KR KR1020097023770A patent/KR101335056B1/ko active IP Right Grant
- 2007-05-11 US US12/067,696 patent/US7812901B2/en not_active Expired - Fee Related
- 2007-05-11 CN CN2007800007278A patent/CN101331424B/zh active Active
- 2007-05-11 KR KR1020087002186A patent/KR20080031909A/ko not_active IP Right Cessation
- 2007-05-11 WO PCT/JP2007/059744 patent/WO2007138838A1/ja active Application Filing
- 2007-05-23 TW TW096118277A patent/TW200801610A/zh unknown
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JP2000029017A (ja) * | 1999-06-30 | 2000-01-28 | Sharp Corp | 液晶表示装置 |
JP2004206067A (ja) * | 2002-11-08 | 2004-07-22 | Seiko Epson Corp | 液晶表示装置及び電子機器 |
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KR20080031909A (ko) | 2008-04-11 |
US20100141873A1 (en) | 2010-06-10 |
CN101331424B (zh) | 2011-01-19 |
TW200801610A (en) | 2008-01-01 |
TWI333106B (ja) | 2010-11-11 |
KR101335056B1 (ko) | 2013-12-03 |
CN101331424A (zh) | 2008-12-24 |
US7812901B2 (en) | 2010-10-12 |
KR20100002282A (ko) | 2010-01-06 |
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