CN102971649A - Laminated polarizing plate set and ips mode liquid crystal display device comprising same - Google Patents
Laminated polarizing plate set and ips mode liquid crystal display device comprising same Download PDFInfo
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- CN102971649A CN102971649A CN2011800328684A CN201180032868A CN102971649A CN 102971649 A CN102971649 A CN 102971649A CN 2011800328684 A CN2011800328684 A CN 2011800328684A CN 201180032868 A CN201180032868 A CN 201180032868A CN 102971649 A CN102971649 A CN 102971649A
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
- G02B5/3083—Birefringent or phase retarding elements
-
- G—PHYSICS
- G02—OPTICS
- 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
- G02B5/3041—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 comprising multiple thin layers, e.g. multilayer stacks
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/13363—Birefringent elements, e.g. for optical compensation
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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
- G02F1/1343—Electrodes
- G02F1/134309—Electrodes characterised by their geometrical arrangement
- G02F1/134363—Electrodes characterised by their geometrical arrangement for applying an electric field parallel to the substrate, i.e. in-plane switching [IPS]
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- Optics & Photonics (AREA)
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- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Geometry (AREA)
- Polarising Elements (AREA)
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Abstract
The present invention relates to a laminated polarizing plate set and to an IPS mode liquid crystal display device comprising same. More particularly, the present invention relates to a laminated polarizing plate set comprising positive A plates arranged on an upper polarizing plate and on a lower polarizing plate, wherein each positive A plate has a front surface phase difference value (R0) of 10 to 100 nm, and a refractive index ratio (NZ) of 0.9 to 1.1, and has a slow phase axis arranged parallel to the absorption axis of a polarizer. The present invention also relates to a liquid crystal display device comprising the laminated polarizing plate and to an IPS mode liquid crystal.; The laminated polarizing plate set according to the present invention has superior physical resistance and maintains the designed phase difference compensating effects even when the plate set is exposed to a high-temperature, high-humidity environment over a long period of time, and therefore the IPS mode liquid crystal display device comprising the plate set can ensure a wide viewing angle even in a high-temperature, high-humidity environment, and improves chromatic vision at a surface thereof that is tilted.
Description
Technical field
The present invention relates to a kind of IPS mode LCD that is coupled the Polarizer assembly and possesses this coupling Polarizer assembly, even in the situation of described coupling Polarizer assembly long-time exposure in the environment that high temperature wets more, resistance to physical change is also excellent, and can keep the delay compensation effect of initial design.
Background technology
Liquid crystal indicator (liquid crystal display:LCD) is widely used as general image display device.
The pattern of this liquid crystal indicator is classified according to the physical property of initial orientation, electrode structure and the liquid crystal of liquid crystal.At present, as the pattern of using maximum liquid crystal indicators, twisted nematic (TN), vertical orientated (VA), the interior switching of face (IPS) etc. are arranged.And, according to whether not applying the voltage time through being classified as Chang Hei or normal white mode.And, farmland and initial orientation according to liquid crystal, the VA pattern is classified as PVA(Patterned VA, patterned vertical orientated) pattern, SPVA(Super PVA, super pattern is vertical orientated) pattern and MVA(multidomain VA, multi-domain vertical alignment) pattern, IPS pattern are classified as S-IPS pattern and FFS pattern.
The liquid crystal molecule of in-plane-switching mode (hereinafter referred to as " IPS pattern ") has and crystal liquid substrate surface in fact level and uniform orientation under non-driven state.For the IPS pattern, when the direction of the fast axle (Fast axis) that sees through axle and liquid crystal molecule of lateral deviation tabula rasa was consistent in face instantly, even in an inclined direction, the fast axle that sees through axle and liquid crystal molecule of downside Polarizer was also consistent.Thus, in the IPS mode LCD,, the light that has passed the downside Polarizer do not change polarization state because having passed liquid crystal, thus can be by being arranged in the Polarizer of upside and downside, and under non-driven state, realize dark attitude.
Because IPS mode LCD, even do not use the blooming that variation compensates to polarized state of light can access wide visual angle yet, so, certainly guaranteed transmitance and on whole picture uniformly image quality and visual angle, thereby can be used in large-scale and the sophisticated display.
Existing IPS mode LCD possesses: liquid crystal cell, and it comprises liquid crystal; Polarizer, it is used for making light polarization on two surfaces of above-mentioned liquid crystal cell; And polarizer protecting film, it is comprised of cellulose triacetate (TAC, Triacetate Cellulose) film on the single surface of above-mentioned polarizer or two surfaces.In this structure, when dark (Black) attitude of liquid crystal display, the light that the polarizer that possesses by the downside Polarizer is polarized, by cellulose triacetate in an inclined direction by elliptic polarization, and should be exaggerated by the light of elliptic polarization polarization in liquid crystal cell, thereby generation light leak and light have multiple color.
In recent years, for the IPS mode LCD, require when maximizing, to improve light leak and have the phenomenon of multiple color, thereby guarantee wide visual angle.
Thus; in the IPS mode LCD; between the polarizer (PVA) of a side and liquid crystal cell, possess the isotropy diaphragm, between the polarizer (PVA) of opposite side and liquid crystal cell, make two above phase shift films with mutually different optical characteristics stacked or possess Z axis orientation (thickness direction orientation) film.For the optical characteristics (contrast etc.) of improving liquid crystal indicator, above-mentioned phase shift films has used without stretched film.
But although without stretched film the improvement of optical characteristics is become easily, under high temperature and many wet external environment conditions, the physical property of film is to physical change and sensitively reaction, postpones and the problem of brightness variation thereby exist to produce.
Summary of the invention
Invent problem to be solved
The present invention wants to provide a kind of coupling Polarizer assembly, and is also excellent to the resistance of physical change even in the situation of described coupling Polarizer assembly long-time exposure in the environment that high temperature wets more, can keep the delay compensation effect of initial design.
In addition, the present invention wants to provide a kind of IPS mode LCD, and it can guarantee the visual angle, and can be by all wavelengths being kept impartial transmitance, thereby particularly in an inclined direction demonstrates excellent color sensation.
Be used for solving the method for problem
The invention provides a kind of coupling Polarizer assembly, described coupling Polarizer assembly comprises: upside Polarizer, stacked the forming of order of the positive A plate that it stretches with diaphragm, polarizer and by single shaft; The downside Polarizer; it is with stacked the forming of sequential cascade of the positive A plate, polarizer and the diaphragm that are stretched by single shaft; length of delay (R0) is respectively 10～100nm in the face of the positive A plate of upside Polarizer and downside Polarizer; and the positive A plate of described upside Polarizer and downside Polarizer is configured to, and makes the slow axis of described positive A plate parallel with the absorption axes of the polarizer of adjacency.
Length of delay (R0) can be 10～80nm in the face of above-mentioned positive A plate.Be preferably, length of delay (R0) is 10～50nm in the face of above-mentioned positive A plate.
The refractive index ratio of above-mentioned positive A plate (NZ) can be 0.9～1.1.
Above-mentioned positive A plate can be made by the compound that is selected from cellulose triacetate (TAC), cyclic olefin polymer (COP), cyclic olefine copolymer (COC), polyethylene terephthalate (PET), polypropylene (PP), polycarbonate (PC), polysulfones (PSF) and the polymethylmethacrylate (PMMA).
Each absorption axes of above-mentioned upside Polarizer and downside Polarizer can be mutually orthogonal.
In addition, the invention provides a kind of IPS mode LCD, it possesses above-mentioned coupling Polarizer assembly.
The effect of invention
The present invention can provide a kind of coupling Polarizer, and is also excellent to the resistance of physical change even in the situation of described coupling Polarizer long-time exposure in the environment that high temperature wets more, can keep the delay compensation effect of initial design.
In addition, the present invention can provide, and under the environment that high temperature wets more, also can guarantee the IPS mode LCD at excellent visual angle even comprise above-mentioned Polarizer.
In addition, the present invention can provide, and all wavelengths is shown impartial transmitance, even and in an inclined direction also have an IPS mode LCD of excellent color sensation.
In addition, coupling Polarizer assembly of the present invention or possess the liquid crystal indicator of coupling Polarizer assembly, be transported at the many Humid Areas of high temperature such as the area that approaches via the torrid areas, with the sea, equator, when perhaps using in the such kind of area, can effectively use flexibly.
In addition, even the present invention is using large backlight of thermal value for more excellent sharpness, or follow the liquid crystal indicator slimming and when causing Polarizer and the distance change between backlight near, also can effectively use flexibly.
Description of drawings
Fig. 1 is the stereographic map of the structure of expression IPS mode LCD involved in the present invention.
Fig. 2 is the mode chart for the refractive index that phase shift films involved in the present invention is described.
The mode chart of Fig. 3 for being used for illustrating that phase shift films involved in the present invention and the draw direction of Polarizer (oriented direction) represent the operating direction (MD) of manufacture process.
Fig. 4 is for being used for explanation at the mode chart of Φ, the θ of coordinate system of the present invention performance.
The figure of the mensuration that Fig. 5 has carried out for the degree of polarization to employed each coupling Polarizer in embodiment involved in the present invention 1～7 and the comparative example 1～4.
Fig. 6 is for representing the figure of the amount of delay of employed each coupling Polarizer in embodiment 1～7 involved in the present invention and the comparative example 1～4.
The figure that the caused transmitance of wavelength that the IPS mode LCD that Fig. 7 a will make in embodiment 1 for expression is measured after dropping in the many moist chambers of high temperature changes.
The figure that the caused transmitance of wavelength that the IPS mode LCD that Fig. 7 b will make in comparative example 1 for expression is measured after dropping in the many moist chambers of high temperature changes.
The figure that the caused transmitance of wavelength that the IPS mode LCD that Fig. 7 c will make in comparative example 3 for expression is measured after dropping in the many moist chambers of high temperature changes.
Fig. 8 a is illustrated in the figure that the polarization state of each IPS mode LCD that embodiment 6, comparative example 1, comparative example 4 make changes.
Fig. 8 b is the figure that is illustrated in the polarization state variation of the IPS mode LCD of making among the embodiment 5.
Fig. 8 c is the figure that is illustrated in the polarization state variation of the IPS mode LCD of making in the comparative example 2.
Fig. 9 comes the figure of transmitance at whole visual angle of each IPS mode LCD of making in comfortable embodiment 1～7 involved in the present invention and the comparative example 1 for expression.
Figure 10 is the figure that is illustrated in the polarization state variation of the IPS mode LCD of making among the embodiment involved in the present invention 8.
Figure 11 comes the figure of transmitance at whole visual angle of the IPS mode LCD made among the comfortable embodiment 8 involved in the present invention for expression.
Figure 12 is the figure that is illustrated in the polarization state variation of the IPS mode LCD of making among the embodiment involved in the present invention 9.
Figure 13 comes the presentation graphs of transmitance at whole visual angle of the IPS mode LCD made among the comfortable embodiment 9 involved in the present invention for expression.
Embodiment
The present invention relates to the IPS mode LCD that is coupled the Polarizer assembly and possesses this coupling Polarizer assembly, even in the situation of described coupling Polarizer assembly long-time exposure in the environment that high temperature wets more, resistance to physical change is also excellent, can keep the delay compensation effect of initial design.
Below, coupling Polarizer assembly of the present invention is specifically described.
Coupling Polarizer assembly of the present invention comprises: upside Polarizer, stacked the forming of order of the positive A plate that it stretches with diaphragm, polarizer and by single shaft; The downside Polarizer, it is with stacked the forming of order of the positive A plate, polarizer and the diaphragm that are stretched by single shaft.
Length of delay (R0) is respectively 10～100nm in the face of the positive A plate of upside Polarizer and downside Polarizer, and refractive index ratio (NZ) is 0.9～1.1.In addition, its slow axis is configured to, and is parallel with the absorption axes of the polarizer of adjacency.
Polarizer is, plays the blooming that the natural light of incident is become the effect of desirable single polarization state (linear polarization state), and described polarizer then is not specially limited so long as usually can realize in the art the blooming of polarization function.
Above-mentioned polarizer for example can come polyvinyl alcohol (PVA) (PVA) film is dyeed with iodine and dichroic dye, and makes it stretch and make at certain orientation.In addition, can use thin polarizer etc., described thin polarizer has, has the electric conductivity lattice of the fine pattern of polarization function at transparency carrier, and is coated with insulation course at paddy and the ridge of this lattice.
Consist of the polyvinyl alcohol resin of polarizer, can be by the saponification of polyvinyl acetate esters resin be made.As the polyvinyl acetate esters resin, can list: as the polyvinyl acetate of the homopolymer of vinyl acetate, vinyl acetate and can with multipolymer of other monomers of vinyl acetate copolymerization etc.As above-mentioned can with the concrete example of other monomers of vinyl acetate copolymerization, can list: unsaturated carboxylic acid class, unsaturated sulfonic acid class, olefines, ethene ethers, have the acrylic amide of ammonium etc.
In addition, polyvinyl alcohol resin can be the resin that is modified, and for example, also can use the polyvinyl formal that is modified as aldehydes or polyvinyl acetal etc.The saponification rate of polyvinyl alcohol resin is generally molar percentage 85～100%, preferably can be molar percentage more than 98%.In addition, the degree of polymerization of polyvinyl alcohol resin is generally 1000～10000, is preferably 1500～5000.
Make such polyvinyl alcohol resin form film and use as polarizer.The film formation method of polyvinyl alcohol resin is not limited especially, can utilize known the whole bag of tricks.The thickness of polyvinyl alcohol resin is not limited especially, for example, can be 10～150 μ m.
Polarizer prepares via following operation usually, that is, to polyvinyl alcohol film as described above carry out uniaxial tension operation, dye and the operation that makes it to adsorb, the operation of processing with boric acid aqueous solution and clean operation with drying with dichromatism pigment.
The polyvinyl alcohol film is carried out the operation of uniaxial tension, can be before dyeing, in the dyeing or carry out after the dyeing.When uniaxial tension is carried out after dyeing, also can before boric acid is processed or in boric acid is processed, carry out.Certainly, wherein also can carry out uniaxial tension by a plurality of stages.Uniaxial tension can use the different roller of peripheral speed or hot-rolling, both can be the dry type stretching that stretches in atmosphere, also can be that the wet type that stretches under the state that makes it to expand with solvent stretches.Normally 3～8 times of draw ratios.
With the operation that dichromatism pigment dyes to the polyvinyl alcohol film that is stretched, for example, can utilize the method for dipping polyvinyl alcohol film in the aqueous solution that contains dichromatism pigment.Dichromatism pigment particularly can use iodine or dichroic dye.In addition, be preferably, the polyvinyl alcohol film is pre-soaked in water and make it to expand before dyeing.
When utilizing iodine as dichromatism pigment, usually can utilize at the dyeing that contains iodine and potassium iodide dipping polyvinyl alcohol film in the aqueous solution, thus the method that dyes.Usually, dyeing with the content of the iodine in the aqueous solution is, contains 0.01～1 weight portion with respect to the water (distilled water) of 100 weight portions, and the content of potassium iodide is, contains 0.5～20 weight portion with respect to the water of 100 weight portions.Dyeing is generally 20～40 ℃ with the temperature of aqueous solution, and dip time for example dyeing time is generally 20～1800 seconds.
On the other hand, when utilizing the dichromatism organic dyestuff with as dichromatism pigment the time, usually can utilize in the dyeing that comprises water miscible dichromatism organic dyestuff with dipping polyvinyl alcohol film in the aqueous solution, thus the method that dyes.Be usually to contain 1 * 10 with respect to the water of 100 weight portions with the content of the dichromatism organic dyestuff in the aqueous solution in dyeing
-4～10 weight portions, preferably contain 1 * 10
-3～1 weight portion.Dyeing can also contain sodium sulphate etc. with aqueous solution inorganic salts are with as dyeing assistant.Dyeing is generally 20～80 ℃ with the temperature of aqueous solution, and dip time for example dyeing time is generally 10～1800 seconds.
The polyvinyl alcohol film that is colored is carried out the acid-treated operation of boron, can be undertaken by in containing the aqueous solution of boric acid, flooding.Usually the boric acid content in containing the aqueous solution of boric acid is, with respect to the water of 100 weight portions and contain 2～15 weight portions, preferably contain 5～12 weight portions.Utilizing iodine aqueous solution with as dichromatism pigment the time, that contain boric acid preferably to contain potassium iodide, the content of potassium iodide is, usually with respect to the water of 100 weight portions and contain 0.1～15 weight portion, preferably contain 5～12 weight portions.The temperature that contains the aqueous solution of boric acid is more than 50 ℃, is preferably 50～85 ℃, more preferably 60～80 ℃, and dip time is 60～1200 seconds, be preferably 150～600 seconds, more preferably 200～400 seconds.
Its drying is washed and made to boric acid to the polyvinyl alcohol film after processing.Washing is processed and can be carried out in water by the polyvinyl alcohol film immersion after will being processed by boric acid.Water temperature when washing is processed is that 5～40 ℃, dip time are 1～120 second.After washing, carry out drying and obtain polarizer.The dry processing can utilize hot-air drier or far infra-red heater to carry out usually, and dry treatment temperature is generally 30～100 ℃, is preferably 50～80 ℃, is generally 60～600 seconds drying time, is preferably 120～600 seconds.
The thickness of polarizer can be 5～40 μ m.
Length of delay (R0) is 10nm～100nm in the face of the positive A plate that is stretched by single shaft in the present invention.The refractive index ratio of above-mentioned positive A plate (NZ) is 0.9～1.1.
Length of delay (R0) is in the face of above-mentioned positive A plate, and length of delay (R0) is 10nm～100nm, is preferably 50nm～80nm in the optimum range of considering in order to ensure wide viewing angle, the face of described positive A plate.
In addition, be 1.0 situation although positive A plate is illustrated in refractive index ratio (NZ) in theory, in the film manufacturing process of reality, it is very difficult making refractive index ratio (NZ) and be 1.0 positive A plate.Therefore, usually, in the art, can have in fact with refractive index ratio (NZ) is that refractive index ratio (NZ) scope of the identical characteristic of 1.0 situation is also processed as positive A plate.
The present invention is made as 0.9～1.1 with refractive index ratio (NZ) scope of substantial positive A plate.
The optical characteristics of positive A plate defines by following mathematical expression 1～3 with respect to all wavelengths in the visible ray regions.
During the wavelength of not mentioned light source, be the optical characteristics for the light of wavelength 589nm.At this, Nx is the axial refractive index of refractive index maximum on the direction in face, Ny be in face on the direction with the refractive index of Nx vertical direction, Nz is the refractive index of thickness direction, these are shown among Fig. 2 as following describing.
［ mathematical expression 1 ］
Rth=［（Nx+Ny）/2-Nz］×d
(at this, Nx, Ny are refractive index and Nx 〉=Ny in the face, and Nz is the thickness of expression film for refractive index, the d of the thickness direction of expression film.）
［ mathematical expression 2 ］
R0=（Nx-Ny）×d
(at this, Nx, Ny are thickness, the Nx 〉=Ny that the interior refractive index of the face of phase shift films, d represent film.）
［ mathematical expression 3 ］
NZ=（Nx-Nz）/（Nx-Ny）=Rth/R0+0.5
(at this, Nx, Ny are refractive index and Nx 〉=Ny in the face, and Nz represents the refractive index of the thick direction of film, the thickness that d represents film.）
In this manual, above-mentioned Rth is that (postpone: retardation), mean refractive index is poor in the face of expression and thickness direction for the delay of thickness direction.This is the reference value that can not be called substantial delay.
R0 postpones in the face, and is that light is in the substantial delay of normal direction (vertical direction) when passing film.
NZ is refractive index ratio, can be distinguished the kind of the plate of phase shift films by NZ.
The kind that can be applied to the plate of phase shift films can be divided into: the A plate, and its direction in the face of film has optical axis (light transmits in the mode that does not have delay); The C plate, it has the optical axis of the vertical direction of face; Biaxial plates, it is the plate when having 2 optical axises.
Positive A plate of the present invention can the film of the refractive index characteristic of (+) forms by just having.Particularly, can use the compound that is selected from cellulose triacetate (TAC), cyclic olefin polymer (COP), cyclic olefine copolymer (COC), polyethylene terephthalate (PET), polypropylene (PP), polycarbonate (PC), polysulfones (PSF) and the polymethylmethacrylate (PMMA).
Positive A plate of the present invention in order to keep the resistance to the physical change of external environment condition, can carry out uniaxial tension to the film of refractive index characteristic with above-mentioned just (+) and make.The above-mentioned film that is stretched owing to consist of the high molecular arrangement distortion of film, is therefore compared with the film that is not stretched, and the susceptibility of the physical change of external environment condition is lowered.
Stretching can be divided into the stiff end stretching and free end stretches.Stiff end stretches and refers to, during film is stretched, and the mode that the length outside the direction that stretches is fixing.Free end stretches and refers to, during film is stretched, the direction outside the draw direction is given the mode of degree of freedom.
Positive A plate of the present invention is free end, carries out uniaxial tension.
In addition, can use outside stretching and append operation, thereby the value of direction, length of delay and the NZ of slow axis (Slow Axis) is controlled, this appends operation so long as normally used operation in the art, and then there is no particular limitation.
The positive A plate that is stretched by single shaft is configured to, and the absorption axes of the polarizer of its slow axis and downside Polarizer is parallel to each other.Be endowed the polarizer that contains polyvinyl alcohol (PVA) (PVA) of polarization function, in the structure of Polarizer, reaction is the sensitiveest under the external environment condition that high temperature wets more.Therefore, by so that the slow axis mode parallel with the absorption axes of polarizer of positive A plate is configured, and induce in the mode that produces in the same direction physical behavio(u)r, thereby can improve physical resistance to external environment condition.
Diaphragm is, because the weak diaphragm that therefore is used for the common name of its film of protecting of the mechanicalness of polarizer.
Diaphragm can use the excellent film such as the transparency, physical strength, thermal stability, water proofing property and isotropy.Because the moisture permeability of said protection film changes according to the kind of the resin that consists of this diaphragm, therefore, be preferably and consider this characteristic and suitably selection.
Particularly, diaphragm can use the film that is selected from the following thermoplastic resin, and described thermoplastic resin can list: the polyester resin of polyethylene terephthalate, polyethylene glycol isophthalate, PEN, polybutylene terephthalate etc.; The cellulosic resin of diacetyl cellulose, tri acetyl cellulose etc.; Polycarbonate resin; The acrylic resin of poly-(methyl) methyl acrylate, poly-(methyl) ethyl acrylate etc.; The styrene resin of polystyrene, acrylonitritrile-styrene resin etc.; The polyolefin resin of tygon, polypropylene, the polyolefin with lopps or norborene structure, ethylene-propylene copolymer etc.; Vinyl chloride resin; The amide-type resin of nylon, aromatic polyamide etc.; The acid imide resin; The polyether sulfone resin; The sulfone resinoid; The polyetheretherketone resinoid; The polyphenylene sulfide resinoid; The vinyl alcohol resin; Vinylidene chloride resin; The polyvinyl butyral resinoid; The arylation resinoid; The polyoxymethylene resinoid; Epikote etc., also can use contain, the film of the potpourri of above-mentioned thermoplastic resin.The film that in addition, also can use heat-curing resins such as containing (methyl) esters of acrylic acid, carbamates, propenoic methyl carbamate class, epoxies, silicone or ultraviolet curing resin to form.
In diaphragm, the content of above-mentioned thermoplastic resin is weight percentage 50～100%, is preferably percentage by weight 50～99%, more preferably percentage by weight 60～98%, most preferably be percentage by weight 70～97%.When content during less than percentage by weight 50%, sometimes can't realize fully the original high transparent that thermoplastic resin has.
Polarizer uses roll-to-roll (Roll-To-Roll) operation and sheet that sheet (Sheet-To-Sheet) operation is made usually.Consider efficient in yield rate and the manufacturing process etc., preferably use roll-to-roll operation, particularly because the direction of the absorption axes of PVA polarizer always is fixed on the MD direction, so it is effective using roll-to-roll operation.
Even coupling Polarizer assembly of the present invention is also excellent to the resistance of physical change at high temperature how in the wet environment in the long-time situation about exposing, can keep the delay compensation effect of initial design.As an example, under 50 ℃, 80%RH, expose the variable quantity of length of delay (R0) in the face after 3 days less than 0.5nm, and the variable quantity of thickness direction retardation value (Rth) is less than 1nm.
Above-mentioned coupling Polarizer assembly of the present invention can be used in the IPS mode LCD.
Under the voltage status that is not applied to, when just being made as (+) direction as benchmark will be rotated counterclockwise take the right side horizontal direction of viewable side, it is that 90 ° (S-IPS) or liquid crystal aligning direction are the liquid crystal cell of 0 ° (FFS) that liquid crystal cell can use the liquid crystal aligning direction.
(△ n * d) be worth is the scope of 300～330nm at 589nm wavelength place to the panel length of delay with following mathematical expression 4 definition of S-IPS, and FFS is the scope of 370～400nm.
［ mathematical expression 4 ］
△n×d=（n
e-n
o）×d
(at this, n
eSpecial ray refractive index (extraordinary ray refractive index), the n of expression liquid crystal
oExpression ordinary ray refractive index (ordinary ray refractive index), d represent the box gap.△ n, d are scale, and scalar.）
The absorption axes of upside Polarizer of the present invention is constituted as, and is mutually orthogonal with the absorption axes of downside Polarizer.At this moment, when from the absorption axes of the polarizer of the top view downside Polarizer of viewable side, it is preferably placed on the vertical direction.
If the absorption axes of the polarizer of the downside Polarizer of close back light unit is vertical direction, the light that has then passed the downside Polarizer is polarized in the horizontal direction.When the light that is polarized in the horizontal direction, pass the liquid crystal cell of the voltage that has been applied in panel and when becoming bright state, light enters in vertical direction, and passes the upside Polarizer that absorption axes is the viewable side of horizontal direction.At this moment, in viewable side, the people who wears absorption axes and be the polarized sunglasses of horizontal direction also can identify the light that sends from liquid crystal indicator.
But if the absorption axes of the polarizer of the downside Polarizer of close back light unit is horizontal direction, the people who has then worn polarized sunglasses can't see image.
In addition, in the situation of large-scale liquid crystal indicator, in order to see preferably image in viewable side, and use wider in the horizontal direction liquid crystal indicator.This is to consider that people's the horizontal direction at main visual angle is wider than vertical direction, and except the specific purposes liquid crystal indicator that advertisement is used etc., general liquid crystal indicator is made with 4: 3 styles or 16: 9 styles.
The effect of viewing angle compensation of the present invention represents to know by changing at the upper polarization state when passing each optical layers of Poincare sphere (Poincare sphere).
Poincare sphere is the method for the variation of the polarization state of performance certain viewing angles.The variation of the polarization state when it can represent to pass the various optical element that liquid crystal indicator inside possesses.At this moment, the light that incides liquid crystal indicator inside uses the light that is polarized, and the light of incident passes liquid crystal indicator inside and penetrated along certain viewing angles.
In the present invention, " certain viewing angles " refer to, the direction of Φ=45 °, θ=60 ° in the represented semicircle coordinate system of Fig. 4.For all wavelengths, the change list of the polarized state of light that will penetrate in above-mentioned direction is shown on the Poincare sphere, thereby can confirm wavelength dispersion.
In addition, after exposing under the many wet environments of high temperature, confirm in the transmitance of wavelength that the color sensation of above-mentioned certain viewing angles (vergence direction) can be by depending on Fig. 7 a～Fig. 7 c.
Therefore the present invention demonstrates uniform transmitance at 300～780nm wavelength owing to possess the specific positive A plate that is stretched at upside Polarizer and downside Polarizer, thereby, make color sensation not only positive but also in an inclined direction also be excellent.
Below, in order to make easy to understand of the present invention preferred embodiment is proposed, but following embodiment just carries out illustration to the present invention, it will be understood by a person skilled in the art that in category of the present invention and technological thought scope and can carry out numerous variations and correction, and such distortion and revise also belongs in the claim scope certainly.
＜embodiment 1＞
Carry out as shown in Figure 1 stacked, and with each blooming involved in the present invention, liquid crystal cell and practical measurement data backlight etc., be used in TECH WIZ LCD 1D(Korea S SANAYI SYSTEM company) in.Below the structure of Fig. 1 is carried out specific description.
From back light unit 40 sides, consisted of by downside Polarizer 10, IPS mode liquid crystal box 30 and upside Polarizer 20, wherein, described IPS mode liquid crystal box 30 is, do not applying under the voltage status, when just being made as (+) direction as benchmark will be rotated counterclockwise take the right side horizontal direction of viewable side, the liquid crystal aligning direction is 90 ° IPS mode liquid crystal box 30.Above-mentioned downside Polarizer 10 is stacked positive A plate 14, polarizer 11 and diaphragm 13 from the liquid crystal cell side.Upside Polarizer 20 is stacked positive A plate 24, polarizer 21 and diaphragm 23 from the liquid crystal cell side.
When the right side horizontal direction take viewable side just was made as (+) direction as benchmark will be rotated counterclockwise, the absorption axes 12 of the polarizer 11 of downside Polarizer 10 was 90 °, and the absorption axes 22 of the polarizer 21 of upside Polarizer 20 is 0 °.
Liquid crystal cell has used the liquid crystal cell on 42 inches panel LC420WU5 that are applied to the production of LG Display company.
On the other hand, employed various blooming and backlightly have an optics physical property described as follows in an embodiment of the present invention.
The polarizer 11 of downside Polarizer 10 and the polarizer 21 of upside Polarizer 20 dye to the PVA that is stretched by using iodine, thereby have given the polarizer function.The polarization function of above-mentioned polarizer, in the visible ray regions of 370～780nm, the degree of polarization of brightness is more than 99.9%, and the group transmitance of brightness is more than 41%.
Be made as TD(λ in the transmitance that sees through axle that will depend on wavelength), will depend on that the transmitance of the absorption axes of wavelength is made as MD(λ), the offset of defined brightness among the JIS Z8701:1999 is made as
The time, the group transmitance of the degree of polarization of above-mentioned brightness and brightness defines by following mathematical expression 5～9.At this, S (λ) is light source light spectrum (light source spectrum), and light source is illuminant-C.
[mathematical expression 5]
[mathematical expression 6]
[mathematical expression 7 ］
[mathematical expression 8 ］
[mathematical expression 9 ］
Under the light source of 589.3nm, the positive A plate 24 of upside Polarizer and the positive A plate 14 of downside Polarizer, having used respectively length of delay (R0) in the face is 1.0 positive A plate as 25nm, refractive index ratio (NZ) as 50nm, thickness direction retardation value (Rth).
The absorption axes 22 of the polarizer 21 in the above-mentioned upside Polarizer is parallel with the slow axis 25 of positive A plate 24, and the absorption axes 12 of the polarizer 11 in the downside Polarizer is parallel with the slow axis 15 of positive A plate 14.
The positive A plate 24 of upside Polarizer and the positive A plate 14 of downside Polarizer are made by the uniaxial tension operation of carrying out the free end stretching, so that it has above-mentioned optical characteristics.
In addition, as the outside diaphragm 23 of upside Polarizer 20 and the outside diaphragm 13 of downside Polarizer 10, used with respect to the cellulose triacetate (TAC) of incident light 589.3nm thickness direction retardation value (Rth) as 50nm.For back light unit 40, used the measured data that is equipped on 32 inches TV LC320WX4 models (production of LG.PHILIPS LCD company).
＜embodiment 2＞
Although being configured with the same mode of above-described embodiment 1, it is 1.0 positive A plate as 25nm, refractive index ratio (NZ) as 50nm, thickness direction retardation value (Rth) that the positive A plate 24 of upside Polarizer 20 has used length of delay (R0) in the face.
In addition, it is 1.0 positive A plate as 80nm, thickness direction retardation value (Rth) as 40nm, refractive index ratio (NZ) that the positive A plate 14 of downside Polarizer 10 has used length of delay (R0) in the face, thereby produces the IPS mode LCD.
＜embodiment 3＞
Although being configured with the same mode of above-described embodiment 1, it is 1.0 positive A plate as 40nm, refractive index ratio (NZ) as 80nm, thickness direction retardation value (Rth) that the positive A plate 24 of upside Polarizer 20 has used length of delay (R0) in the face.
In addition, it is 1.0 positive A plate as 80nm, thickness direction retardation value (Rth) as 40nm, refractive index ratio (NZ) that the positive A plate 14 of downside Polarizer 10 has used length of delay (R0) in the face, thereby produces the IPS mode LCD.
＜embodiment 4＞
Although being configured with the same mode of above-described embodiment 1, it is 1.0 positive A plate as 40nm, refractive index ratio (NZ) as 80nm, thickness direction retardation value (Rth) that the positive A plate 24 of upside Polarizer 20 has used length of delay (R0) in the face.
In addition, it is 1.0 positive A plate as 50nm, thickness direction retardation value (Rth) as 25nm, refractive index ratio (NZ) that the positive A plate 14 of downside Polarizer 10 has used length of delay (R0) in the face, thereby produces the IPS mode LCD.
＜embodiment 5＞
Although being configured with the same mode of above-described embodiment 1, it is 1.0 positive A plate as 15nm, refractive index ratio (NZ) as 30nm, thickness direction retardation value (Rth) that the positive A plate 24 of upside Polarizer 20 has used length of delay (R0) in the face.
In addition, it is 1.0 positive A plate as 30nm, thickness direction retardation value (Rth) as 15nm, refractive index ratio (NZ) that the positive A plate 14 of downside Polarizer 10 has used length of delay (R0) in the face, thereby produces the IPS mode LCD.
＜embodiment 6＞
Although being configured with the same mode of above-described embodiment 1, it is 1.0 positive A plate as 5nm, refractive index ratio (NZ) as 10nm, thickness direction retardation value (Rth) that the positive A plate 24 of upside Polarizer 20 has used length of delay (R0) in the face.
In addition, it is 1.0 positive A plate as 10nm, thickness direction retardation value (Rth) as 5nm, refractive index ratio (NZ) that the positive A plate 14 of downside Polarizer 10 has used length of delay (R0) in the face, thereby produces the IPS mode LCD.
＜embodiment 7＞
Although being configured with the same mode of above-described embodiment 1, it is 1.0 positive A plate as 50nm, refractive index ratio (NZ) as 100nm, thickness direction retardation value (Rth) that the positive A plate 24 of upside Polarizer 20 has used length of delay (R0) in the face.
In addition, it is 1.0 positive A plate as 100nm, thickness direction retardation value (Rth) as 50nm, refractive index ratio (NZ) that the positive A plate 14 of downside Polarizer 10 has used length of delay (R0) in the face, thereby produces the IPS mode LCD.
＜embodiment 8＞
Although with the same mode of above-described embodiment 1 and be configured, but it is 0.9 positive A plate as 50nm, thickness direction retardation value (Rth) as 20nm, refractive index ratio (NZ) that the positive A plate 24 of upside Polarizer and the positive A plate 14 of downside Polarizer have used respectively length of delay (R0) in the face, thereby produces the IPS mode LCD.
＜embodiment 9＞
Although with the same mode of above-described embodiment 1 and be configured, but it is 1.1 positive A plate as 50nm, thickness direction retardation value (Rth) as 30nm, refractive index ratio (NZ) that the positive A plate 24 of upside Polarizer and the positive A plate 14 of downside Polarizer have used respectively length of delay (R0) in the face, thereby produces the IPS mode LCD.
＜comparative example 1＞
Although with the same mode of above-described embodiment 1 and be configured; but used respectively length of delay (R0) in the face to be 1nm, thickness direction retardation value (Rth) the isotropy diaphragm as 2nm; replace the positive A plate 24,14 of upside Polarizer and downside Polarizer, thereby produce the IPS mode LCD.
＜comparative example 2＞
Although with the same mode of above-described embodiment 1 and be configured, but constitute the absorption axes 22 of the polarizer 21 in the upside Polarizer and slow axis 25 quadratures of positive A plate 24, and the absorption axes 12 of the polarizer 11 in the downside Polarizer and slow axis 15 quadratures of positive A plate 14, thereby produce the IPS mode LCD.
＜comparative example 3＞
Although being configured with the same mode of above-described embodiment 1, it is 1.0 positive A plate as 25nm, refractive index ratio (NZ) as 50nm, thickness direction retardation value (Rth) that the positive A plate 24 of upside Polarizer 20 has used length of delay (R0) in the face.
In addition, used length of delay (R0) in the face as 1nm, thickness direction retardation value (Rth) the isotropic diaphragm as 2nm, replaced the positive A plate 14 of downside Polarizer 10, thereby produce the IPS mode LCD.
＜comparative example 4＞
Although to be configured with the same mode of above-described embodiment 1, used length of delay (R0) in the face to be 1nm, thickness direction retardation value (Rth) the isotropic diaphragm as 2nm, replaced the positive A plate 24 of upside Polarizer 20.
In addition, it is 1.0 positive A plate as 50nm, thickness direction retardation value (Rth) as 25nm, refractive index ratio (NZ) that the positive A plate 14 of downside Polarizer 10 has used length of delay (R0) in the face, thereby produces the IPS mode LCD.
＜test example＞
By following method the coupling Polarizer assembly made in above-described embodiment and comparative example and the characteristic of liquid crystal indicator are measured.
(1) degree of polarization of liquid crystal indicator
Use V7100 and the degree of polarization of the Polarizer of 30 * 30mm size is measured.
(2) amount of delay of coupling Polarizer assembly
It is in 50 ℃, the chamber of 80%RH (high temperature how wet chambers) that coupling Polarizer assembly is dropped into temperature, and respectively to measuring through the retardation after 3 days.
(3) polarization state of liquid crystal indicator changes
On Poincare sphere, the polarization state of Φ=45 °, θ=60 ° vergence direction changed and measure.
(4) coupling Polarizer assembly has or not the generation spot
It is in 50 ℃, the chamber (the many moist chambers of high temperature) of 80%RH that coupling Polarizer assembly is dropped into temperature, and Visual Confirmation after 3 days, have or not the generation spot.
［ benchmark of the generation degree of spot ］
〇: almost do not produce; △: common; *: a large amount of generation.
Fig. 5 is the figure that the degree of polarization of the liquid crystal indicator that produces has been carried out mensuration in embodiment 1～7 and comparative example 1～4.No matter can confirm to have or not stretching, degree of polarization all shows equal scope.
Fig. 6 is the figure that is illustrated in the amount of delay of employed coupling Polarizer assembly in embodiment 1～7 and the comparative example 1～4.Can be confirmed by above-mentioned Fig. 6, according to having or not of stretching, drop into the interior length of delay of face of the many moist chambers of high temperature front and back and the variable quantity of thickness direction retardation value and significantly change.Compare with the situation of having used stretched film as can be known, the variable quantity of length of delay is very large under having used without the situation of stretched film.
In addition, can confirm to compare with the combination of stretched film stretched film and larger without the variable quantity of the length of delay of the combination of stretched film.
In addition, following table 1 is for having carried out the table of confirming to the spot generation degree of the coupling Polarizer assembly of embodiment 1～7 and comparative example 1.Can be confirmed that by table 1 it is very low to have used the spot of the embodiment 1～7 of coupling Polarizer of the present invention combination to produce degree.
［ table 1 ］
| | Embodiment | 1 | |
|
|
Embodiment 5 | |
Embodiment 7 | Comparative example 1 |
| The generation degree of spot | 〇 | 〇 | 〇 | 〇 | 〇 | 〇 | 〇 | × |
Fig. 7 a～Fig. 7 c is that the IPS liquid crystal indicator that will make in embodiment 1, comparative example 1 and 3 changes the figure that measures and illustrate to the caused transmitance of wavelength after dropping in the many wet chambers of high temperature.At this moment, the wavelength in blue path is that the wavelength of 430nm, red path is that the wavelength of 630nm, green path is 430nm.
Fig. 7 is observed, though the coupling Polarizer assembly of embodiment 1 drop into high temperature how in the wet chambers after, still (300～780nm) locate to demonstrate uniform transmitance at all wavelengths.On the other hand, can confirm in comparative example 1 and comparative example 3, to have the poor of the caused transmitance of wavelength.Therefore, because the caused transmitance variation of the wavelength of above-described embodiment 1 is lower, therefore the color sensation on positive and vergence direction is all excellent.
Fig. 8 a is the figure that is illustrated in the polarization state variation of the liquid crystal indicator of making in embodiment 6, comparative example 1 and the comparative example 4.Above-mentioned Fig. 8 a is observed, can confirm to have used the comparative example 1 of isotropic membrane to demonstrate identical visual experience with embodiment 6.At this moment, above-mentioned Fig. 8 a is, on Poincare sphere, take the light source of 550nm as benchmark, passing successively the polarizer 11(polarization state 1 of downside Polarizer 10), positive A plate 14(polarization state 2), liquid crystal cell 30(polarization state 3) and positive A plate 24(polarization state 4) afterwards the variation of polarization state.
Fig. 8 b is the polarization state of the liquid crystal indicator of manufacturing in embodiment 5.Polarization state to above-mentioned Fig. 8 b is observed, and demonstrates as can be known the visual experience (with reference to Fig. 9) identical with Fig. 8 a.
Fig. 8 c is the polarization state of the liquid crystal indicator of manufacturing in comparative example 2.The absorption axes of polarizer and the slow axis of phase shift films are mutually orthogonal, can confirm that above-mentioned Fig. 8 c shows the diverse polarization state variation with the present invention.Guaranteeing with the variation of brightness of the visual angle of the polarization state of Rendering 8c is larger.
Fig. 9 is the figure to simulating from the transmitance at whole visual angles of embodiment 1～7 and comparative example 1, can confirm to demonstrate the visual experience identical with the comparative example 1 that has used isotropic membrane.
Figure 10～13 change for the polarization state that is illustrated among embodiment 8 and the embodiment 9 the IPS mode LCD of making and from the figure of the transmitance at whole visual angles, can confirm with embodiment 5 closely similar.
That is, can confirm that refractive index ratio (NZ) is that 0.9 to demonstrate with refractive index ratio (NZ) with 1.1 plate be the identical in fact characteristic of 1.0 positive A plate.
Claims (7)
1. coupling Polarizer assembly comprises:
The upside Polarizer, stacked the forming of order of the positive A plate that it stretches with diaphragm, polarizer and by single shaft; The downside Polarizer, it is with stacked the forming of order of the positive A plate, polarizer and the diaphragm that are stretched by single shaft,
Length of delay (R0) is respectively 10～100nm in the face of the positive A plate of described upside Polarizer and described downside Polarizer, and the positive A plate of described upside Polarizer and described downside Polarizer is configured to, and makes the slow axis of described positive A plate parallel with the absorption axes of the polarizer of adjacency.
2. coupling Polarizer assembly as claimed in claim 1, wherein,
Length of delay (R0) is 10～80nm in the face of described positive A plate.
3. coupling Polarizer assembly as claimed in claim 2, wherein,
Length of delay (R0) is 10～50nm in the face of described positive A plate.
4. coupling Polarizer assembly as claimed in claim 1, wherein,
The refractive index ratio of described positive A plate (NZ) is 0.9～1.1.
5. coupling Polarizer assembly as claimed in claim 1, wherein,
Described positive A plate is made by the compound that is selected from cellulose triacetate (TAC), cyclic olefin polymer (COP), cyclic olefine copolymer (COC), polyethylene terephthalate (PET), polypropylene (PP), polycarbonate (PC), polysulfones (PSF) and the polymethylmethacrylate (PMMA).
6. coupling Polarizer assembly as claimed in claim 1, wherein,
Each absorption axes of described upside Polarizer and described downside Polarizer consists of in mutually orthogonal mode.
7. IPS mode LCD, it possesses such as the described coupling Polarizer of any one in the claim 1～6 assembly.
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR20100062466 | 2010-06-30 | ||
| KR10-2010-0062466 | 2010-06-30 | ||
| KR10-2011-0035583 | 2011-04-18 | ||
| KR1020110035583A KR20120002411A (en) | 2010-06-30 | 2011-04-18 | A laminated polarizer set and in-plane switching mode liquid crystal display comprising the same |
| PCT/KR2011/004527 WO2012002667A2 (en) | 2010-06-30 | 2011-06-21 | Laminated polarizing plate set and ips mode liquid crystal display device comprising same |
Publications (2)
| Publication Number | Publication Date |
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| CN102971649A true CN102971649A (en) | 2013-03-13 |
| CN102971649B CN102971649B (en) | 2015-11-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201180032868.4A Expired - Fee Related CN102971649B (en) | 2010-06-30 | 2011-06-21 | Coupling Polarizer assembly and possess the IPS mode LCD of this coupling Polarizer assembly |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JP5808805B2 (en) |
| KR (1) | KR20120002411A (en) |
| CN (1) | CN102971649B (en) |
| TW (1) | TWI537618B (en) |
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| CN105593725A (en) * | 2013-10-03 | 2016-05-18 | 住友化学株式会社 | Set of polarizing plates and front plate-integrated liquid crystal display panel |
| CN107085320A (en) * | 2017-04-14 | 2017-08-22 | 深圳市华星光电技术有限公司 | A kind of measuring method of liquid crystal panel optical path difference |
| WO2019158065A1 (en) * | 2018-02-13 | 2019-08-22 | 华为技术有限公司 | Protective film and method and device for cutting protective film |
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| KR102180525B1 (en) * | 2019-01-07 | 2020-11-18 | 동우 화인켐 주식회사 | Liquid crystal display |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN102971649B (en) | 2015-11-25 |
| TW201200918A (en) | 2012-01-01 |
| JP5808805B2 (en) | 2015-11-10 |
| JP2013531277A (en) | 2013-08-01 |
| TWI537618B (en) | 2016-06-11 |
| KR20120002411A (en) | 2012-01-05 |
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