CN101107560A

CN101107560A - Optical compensation sheet, manufacturing method of same, polarizer and liquid crystal display device using same

Info

Publication number: CN101107560A
Application number: CNA2005800453725A
Authority: CN
Inventors: 铃木聪美; 网盛一郎
Original assignee: Fujifilm Corp
Current assignee: Fujifilm Corp
Priority date: 2004-12-28
Filing date: 2005-12-28
Publication date: 2008-01-16
Anticipated expiration: 2025-12-28
Also published as: JP2006184646A; CN100510905C

Abstract

An optical compensation sheet is disclosed. The sheet comprising a polymer layer (13) formed by coating and drying a solution comprising a polymer compound and a solvent composition comprising 20% by weight or more of water; and an optically anisotropic layer (12) formed on the surface of the polymer layer by hardening a liquid crystal layer comprising at least one liquid-crystalline compound under irradiation of ultraviolet radiation at a film surface temperature from 70 to 160 DEG C; wherein a in-plane retardation (Re) value of the optically anisotropic layer is not zero, and the optically anisotropic layer gives substantially equal retardation values for light of a wavelength coming respectively in a direction rotated by +40 DEG and in a direction rotated by -40 DEG with respect to a normal direction of a layer place using an in-plane slow axis as rotation axis.

Description

Optical compensating gage, its preparation method, the polaroid that utilizes it and LCD

Technical field

The present invention relates to optical compensating gage, its preparation method and utilize its LCD, more particularly, the LCD of vertical orientated (VA) pattern that the present invention relates to be preferably used for the optical compensating gage of LCD of vertical orientated (VA) pattern and its preparation method and aspect viewing angle characteristic, improve.

Background technology

CRT (cathode-ray tube (CRT)) mainly has been applied in the various display devices, and these display devices are used for office automation (OA) equipment, as word processor, subnotebook PC and personal computer monitor, mobile telephone terminal and televisor.The advantage that LCD has is to approach, in light weight and low energy consumption, and in recent years, it has replaced CRT widely.LCD generally includes liquid crystal cells (liquid crystal cell) and polaroid.Polaroid has protective film and polarization film usually, the typically polarization film of being made up of polyvinyl alcohol film and iodine by drying, stretching, piles up protective film obtain on two surfaces of this polarization film.Transmission type lcd device is generally comprised within the polaroid on the liquid crystal cells both sides, comprises one or more optical compensating films once in a while.Reflection LCD comprises reflecting plate, liquid crystal cells, one or more optical compensating film and polaroid usually successively.Liquid crystal cells comprises liquid crystal molecule, seals two matrix of described liquid crystal molecule and applies voltages to the electrode layer of described liquid crystal molecule.Depend on the change of the state of orientation of liquid crystal molecule, the demonstration that described liquid crystal cells conversion is opened and closed, and transmission-type and reflection-type all are suitable for, wherein, the display mode of proposition comprises TN (twisted nematic), IPS (face internal conversion), OCB (optical compensation curved) and VA (vertical orientated), ECB (ECB electrically controlled birefringence) and STN (STN Super TN).Yet, can change by the displayable color of traditional LCD and the contrast visual angle when watching LCD.Therefore, the viewing angle characteristic of talkative LCD has not surpassed the performance of CRT.

In recent years, proposed vertical orientated nematic liquid crystal displays (this and after, be called " VA pattern ") as the pattern that can improve the LCD of viewing angle characteristic, wherein, use to have the nematic liquid crystal molecules of negative dielectric anisotropic, wherein, liquid crystal molecule is oriented, so that do not applying under the voltage, its major axis is basic vertical with matrix, and drives (referring to Japanese publication " Tokkaihei " No.2-176625) by thin film transistor (TFT).The VA pattern not only is similar to excellence aspect the display characteristic of TN pattern in top view, and can show wideer viewing angle characteristic by the retardation films that use is used for viewing angle compensation.It is also known that, by using the negative uniaxial retardation plate (negative c-plate) that on the direction vertical, has optical axis with film surface, the VA pattern is successful obtaining aspect the wideer viewing angle characteristic, and the retardation films (positive a-plate) that has the positive uniaxial orientation of positive refracting power anisotropy (is that 50nm represents with delay in the face) by employing, can obtain wideer viewing angle characteristic (referring to SID 97 DIGEST, 845-848 page or leaf) for LCD.

Yet, use the retardation films of accelerating to cause the increase of preparation cost.The bonding of described many films not only is tending towards reducing productive rate, and is tending towards reducing display quality owing to the error of bonding angle.Use a plurality of films to cause the increase of thickness, may cause unfavorable in making the display device attenuation.

Positive a-plate is formed by the film that stretches usually.The film of the stretching by the preparation of simple longitudinal stretching technology has the parallel slow axis of moving direction (MD) with film usually.Therefore, the a-plate that is formed by the film of described stretching has the parallel slow axis of moving direction (MD) with film.Yet, in the viewing angle compensation of VA pattern, need make the slow axis and the staggered quadrature of MD of a-plate, the absorption axes of polaroid is orientated along MD, and this makes as a result can not greatly increase cost thus with the mode adhesive film of roll-to-roll (roll-to-roll).A kind of possible scheme is the so-called cross directional stretch film that utilizes by preparing at direction (TD) oriented film with the MD quadrature, but, the cross directional stretch film is tending towards causing slow axis to be called as the distortion of " crooked (bowing) ", reduces productive rate, increases cost thus.Also having a kind of misgivings is that the pressure-sensitive bonding coat that is used to make oriented film to pile up may shrink under temperature that changes or humidity, cause such as divided thin film from warpage failure.As the approach that improves these problems, known method is to prepare a-plate (participating in Japanese publication " Tokkai " No.2000-304930) by the coating rod shaped liquid crystal.

In nearer several years, proposed to use biaxial retardant plates to replace the method (SID 2003 DIGEST, 1208-1211 page or leaf) of the combination of c-plate and a-plate.Use biaxial retardant plates not only to depend on aspect the contrast at visual angle but also be favourable improving aspect the tone in improvement, but be used to the biaxial stretch-formed of production biaxial retardant plates usually, be similar to cross directional stretch, be difficult to guarantee realize evenly axle control, and cause the productive rate of difference and the cost of increase in whole film zone.

Proposed do not relying under the stretching, typically, come the method for production biaxial retardant plates by the dish type liquid crystal that polarizing light irradiation is specific (Japanese publication " Tokkai " No.2002-6138) by the cholesteryl liquid crystal (WO 03/054111 A13) that polarizing light irradiation is specific.These methods can overcome owing to the variety of issue that stretches.

For according to comprising that the method for the application step of coating of liquid crystalline material prepares retardation plate, need provide oriented layer in its lower section, so that the liquid crystal material orientation.Yet, normally used oriented layer, those as forming by polyvinyl alcohol (PVA), polyimide etc., perhaps or even on its side chain, have those of reactive group, can not obtain with forms by liquid crystal layer desirable level bonding.

Another known problem is to compare with the retardation plate for preparing by the method that does not comprise application step according to the retardation plate of the method preparation that comprises application step, obtains worse positive contrast level.

Summary of the invention

Therefore, the purpose of first embodiment of the invention provides can be with the optical compensating gage of the application type of mode optical compensation liquid crystal cells accurately, is excellent aspect its cohesive between layer that is formed by liquid-crystal composition and oriented layer; The present invention also provides polaroid and the LCD of using described optical compensating gage.Especially, the purpose of this invention is to provide those that are used for the VA-mode LCD.

The purpose of second embodiment of the present invention provides can be with the optical compensating gage of the application type of mode optical compensation liquid crystal cells accurately, particularly help to improve the optical characteristics of representing by positive contrast of VA-mode LCD, the polaroid that uses this optical compensating gage is provided.Also a purpose provides LCD, particularly the VA-type LCD of improvement is being arranged aspect the positive contrast.

First embodiment of the present invention relates to optical compensating gage, it comprises residuite, by the polymeric layer that is coated with and the dry solution that comprises polymerizable compound and the solvent compositions with 20 weight % or more water forms on described residuite, and optical anisotropic layer, it is by solidifying down the liquid crystal layer that comprises at least a liquid-crystal compounds and form on the surface at described polymeric layer being 70-160 ℃ at film surface temperature under the irradiation of ionizing radiation;

Wherein, it is not 0 that the front of described optical anisotropic layer postpones (Re) value, and utilize the interior slow axis of face as sloping shaft (turning axle), described optical anisotropic layer for wavelength be λ nm respectively from light with respect to the direction of+40 ° of the normal direction of layer plane rotations and-40 °, have essentially identical length of delay.

As embodiments of the present invention, provide as follows: the optical compensating gage of first embodiment, wherein, described liquid-crystal compounds is the polymeric liquid crystal compound with at least one reactive group, and described optical anisotropic layer is the layer that forms of hardening bath crystal layer thus by the reaction of carrying out reactive group under the heating and/or the irradiation of ionizing radiation; The optical compensating gage of first embodiment, wherein, when shining by ionizing radiation, the film surface temperature of described liquid crystal layer is than the glass transition temperature height of described polymerizable compound; The optical compensating gage of first embodiment, wherein, when shining by ionizing radiation, the film surface temperature of described liquid crystal layer is than the high 1-30 of glass transition temperature ℃ of described polymerizable compound; The optical compensating gage of first embodiment, wherein, described solution comprises at least a polymerizable compound that has polymerizable groups on its side chain; The optical compensating gage of first embodiment, wherein, described liquid-crystal compounds shows cholesteryl liquid crystal (cholesteric liquid crystallinity); The optical compensating gage of first embodiment, wherein, described liquid-crystal compounds is to have the polymeric liquid crystal compound of at least one ethylenic unsaturated group and described optical anisotropic layer is to solidify the layer that described liquid crystal layer forms thus by carry out the reaction of at least one ethylenic unsaturated group under the polarized ultraviolet irradiation.

Second embodiment of the present invention relates to the optical compensating gage that comprises optical anisotropic layer, described optical anisotropic layer is formed by cholesteric liquid crystal compositions, it has 500nm or more as many as 5 μ m or thickness still less and the courage steroid spacing (cholesteric pitch) that has are 120nm or littler

Wherein, described cholesteric liquid crystal compositions comprises at least a polymerisable cholesteric liquid crystal compound with at least one reactive group, and described optical anisotropic layer solidifies described cholesteric liquid crystal compositions thus by carry out the reaction of described reactive group under the irradiation of heating and/or ionizing radiation and forms.

On the other hand, second embodiment of the present invention relates to optical compensating gage, it comprises residuite, be formed at the polymeric layer on the described residuite, with lip-deep optical anisotropic layer at described polymeric layer, described optical anisotropic layer is formed by the cholesteric liquid crystal compositions of polymerization, and it has 500nm or more as many as 5 μ m or thickness still less and the courage steroid spacing that has are 120nm or littler

Wherein, it is 0 that the front of described optical anisotropic layer postpones (Re) value, and utilize in the face slow axis as sloping shaft (turning axle), described optical anisotropic layer is that the length of delay from respect to the light of the direction of+40 ° of the normal direction rotations of layer plane of λ nm is not 0 for wavelength.

On the other hand, second embodiment of the present invention relates to optical compensating gage, and it comprises residuite; Be formed at the polymeric layer on the described residuite, with optical compensating gage at the lip-deep optical anisotropic layer of described polymeric layer, described optical anisotropic layer is formed by the liquid-crystal composition of polymerization, it has 500nm or more as many as 5 μ m or thickness still less and the courage steroid spacing that has are 120nm or littler

As embodiments of the present invention, provide as follows: the optical compensating gage of second embodiment, wherein, the courage steroid spacing of described optical anisotropic layer is 100nm or littler; The optical compensating gage of second embodiment, wherein, described optical anisotropic layer is by carrying out being solidified to form of described composition under the irradiation of polarized ultraviolet; The optical compensating gage of second embodiment, it is 0-70nm that its front that has postpones, and utilize in the face slow axis as sloping shaft (turning axle), described optical anisotropic layer is the delay that the light from respect to the direction of+40 ° of the normal direction rotations of layer plane of λ nm has 30-150nm for wavelength.

The optical compensating gage of first or second embodiment can comprise and comprises at least a residuite that is selected from the polymkeric substance of cellulose-based polymer and cycloalkenyl group polymkeric substance.

The optical compensating gage of first or second embodiment can be used for the optical compensation of liquid crystal cells, described liquid crystal cells comprises a pair of matrix that is disposed opposite to each other and remains in the liquid crystal layer that comprises liquid crystal material between the described a pair of matrix that the liquid crystal molecule of described liquid crystal material and the surface of described a pair of matrix substantially perpendicularly are orientated.

On the other hand, the invention provides and comprise polarization film and at least one polaroid as the first or second described optical compensating gage of embodiment.

On the other hand, the invention provides and comprise at least one polaroid of the present invention or at least one LCD as the optical compensating gage of first or second embodiment.

LCD can adopt the VA-pattern.

On the other hand, the invention provides the preparation method of optical compensating gage, it comprises:

On residuite, form polymeric layer by coating and the dry solution that comprises polymerizable compound and solvent compositions with 20 weight % or more water; With

By being to comprise the lip-deep liquid crystal layer of the described polymeric layer of placing of at least a liquid-crystal compounds with ionizing radiation irradiation under 70-160 ℃ to make it to be solidified to form optical anisotropic layer at film surface temperature,

Description of drawings

Fig. 1 is the schematic cross-section that shows the exemplary optics compensating plate of first embodiment of the invention;

Fig. 2 is the schematic cross-section that shows the exemplary optics compensating plate of second embodiment of the invention;

Fig. 3 A-3D is the schematic cross-section that shows the example of polaroid of the present invention;

Fig. 4 is the schematic cross-section that shows illustrative liquid crystal display of the present invention;

Fig. 5 is the schematic cross-section that shows the optical axis of the layer structure of the LCD for preparing among the embodiment 1-3 and layer;

Fig. 6 is the figure that is presented at the contrast-response characteristic of the LCD for preparing among the embodiment 1-3;

Fig. 7 A and 7B are the schematic cross-sections that shows the optical axis of the layer structure of the LCD for preparing among embodiment 2-5 to 2-8 and Comparative Examples 2-3 and the 2-4 and layer; With

Fig. 8 is the figure that is presented at the contrast-response characteristic of the LCD for preparing among the embodiment 2-5.

The following component of label representative in the accompanying drawings:

11: residuite;

12,12 ': the optical anisotropic layer that forms by liquid-crystal composition;

13,13 ': oriented layer;

21: polarization layer;

22,23: protective film;

24: functional layer, as λ/4 plates, antireflective film etc.;

31: cathode-ray tube (CRT);

32: reflector plate;

33: light guide plate;

34: the film of may command light such as brightness enhancing films, diffusion film etc.;

35: liquid crystal cells;

36: following polaroid;

37: upper polarizer;

41: polarization layer;

42: residuite;

43: oriented layer;

44: optical anisotropic layer;

45: polarizer protection film;

46: the glass matrix that is used for liquid crystal;

47: liquid crystal cells;

48: contact adhesive; With

51: the optical compensating gage of uniaxial tension.

Detailed Description Of The Invention

Below will describe the present invention in detail.

In this manual, by " extremely " expression scope refer to be included in described " extremely " before and numerical value afterwards as minimum of a value and peaked number range.

In this manual, the Re of thin polymer film (λ) and Rth (λ) are illustrated respectively in interior the delay and the delay on thickness direction of face under the wavelength X. For with the film surface vertical direction on wavelength be the incident light of λ nm, measure Re (λ) by using KOBRA-21ADH (being produced by Oji Scientific Instruments). Calculate Rth (λ) based on Re (λ) value and a plurality of length of delay by use KOBRA 21ADH, for with respect to slow axis in the use face as the normal direction of the film of sloping shaft (rotating shaft) take the wavelength of a plurality of direction rotations as the described a plurality of length of delays of the photo measure of the incident of λ nm, described interior slow axis determined by KOBRA 21ADH. The mean refractive index and the one-tenth-value thickness 1/10 that need the supposition of adding film. By using KOBRA 21ADH to calculate nx, ny and nz value and Rth (λ) are worth. As the mean refractive index of cellulose acylate, in 1.48, the mean refractive index example of the most optical thin films except cellulose acylate film is as follows:

Cyclic olefin polymer (1.52), Merlon (1.59), polymethyl methacrylate (1.49), polystyrene (1.59).

The mean refractive index of various materials is described in the file of publication such as " POLYMER HANDBOOK " (JOHN WILEY﹠SONS, INC) and catalogue thereof. If this value is unknown, can measure this value with Abbe refractometer etc. Unless specialize, measuring wavelength is 545 ± 5nm or 590 ± 5nm.

It is pointed out that about angle term in this manual " basically " refers to the error with respect to being lower than of can allowing of accurate angle ± 5 °. Preferably be lower than 4 ° with the difference of accurate angle, more preferably less than 3 °. Should also be noted that about length of delay, term in this manual " basically " refers to can to allow with respect to exact value to be lower than ± 5% error. It should also be noted that in this manual " the Re value is not 0 " refers to that the Re value is not less than 5nm. The measurement wavelength that is used for refractive index is visible wavelength, unless specialize. Should also be noted that term " visible light " refers to the light of wavelength in the 400-700nm scope in this manual.

[optical compensating gage]

Fig. 1 is the schematic cross-section that shows according to the exemplary optics compensating plate of first embodiment of the invention. Residuite 11 and the optical anisotropic layer 12 that provides thereon are provided the optical compensating gage of first embodiment of the invention. Between residuite 11 and optical anisotropic layer 12, be furnished with polymeric layer 13, when forming optical anisotropic layer, polymeric layer 13 plays the oriented layer of the orientation of the liquid crystal molecule in the control optical anisotropic layer 12. Optical anisotropic layer 12 is by being to solidify the layer that the liquid crystal layer comprise at least a liquid-crystal compounds forms under 70-160 ℃ under the irradiation in ionizing radiation at film surface temperature. The polymeric layer 13 that plays the oriented layer effect of optical anisotropic layer 12 is the polymeric layers that form by coating and the dry solution that comprises at least a polymerizable compound and the solvent compositions with 20 % by weight or more water. Polymeric layer 13 and optical anisotropic layer 12 are being excellent aspect the cohesive each other, even the optical compensating gage of this first embodiment is stood cleaning treatment such as flushing or chemical treatment such as saponification, they can not separate yet, and therefore, are easy to process optical compensating gage. In addition, regulate the optical characteristics of optical anisotropic layer 12 so that front delay (Re) value of optical anisotropic layer is not 0, and utilize the interior slow axis of face as sloping shaft (rotating shaft), described optical anisotropic layer for wavelength be λ nm respectively from the light with respect to the direction of+40 ° of the normal direction of layer plane rotations and-40 °, have essentially identical length of delay. Therefore, the optical compensating gage of the first embodiment can accurately compensate liquid crystal cells, especially VA-mode liquid crystal unit.

Fig. 2 is the schematic cross-section that shows the exemplary optics compensating plate of second embodiment of the invention. The optical compensating gage of second embodiment of the invention comprises residuite 11 and optical anisotropic layer 12 '. Between residuite 11 and optical anisotropic layer 12 ', be furnished with polymeric layer 13 ', when forming optical anisotropic layer 12 ', polymeric layer 13 ' works to control the oriented layer of the orientation of the liquid crystal molecule in the optical anisotropic layer 12 '. Optical anisotropic layer 12 is the layers that form by solidify the liquid-crystal composition comprise at least a liquid-crystal compounds under the irradiation of ionizing radiation. Playing the polymeric layer 13 of the oriented layer effect of optical anisotropic layer 12 ', is the polymeric layer that forms by coating and the dry solution that comprises at least a polymerizable compound. Optical anisotropic layer 12 ' is the layer that forms by hardening composition in cholesteric phase (cholesteric phase), and its courage steroid spacing is 120nm or still less. The thickness of optical anisotropic layer 12 ' comprises two end points in the scope of 500nm-5 μ m. Second embodiment of the invention, use described optical anisotropic layer so that can accurately compensate liquid crystal cells, especially VA-mode liquid crystal unit.

Regulate the optical characteristics of optical anisotropic layer 12 ' so that front delay (Re) value of this optical anisotropic layer is not 0, and utilize the interior slow axis of face as sloping shaft (rotating shaft), described optical anisotropic layer for wavelength be λ nm respectively from the light with respect to the direction of+40 ° of the normal direction of layer plane rotations and-40 °, has essentially identical length of delay, thereby, it can be used as twin shaft medium (biaxial medium), therefore can compensate more accurately liquid crystal cells, especially VA-mode liquid crystal unit.

What can also allow is that to postpone (Re) value be not 0 for the front of this optical anisotropic layer, and utilize in the face slow axis as sloping shaft (rotating shaft), described optical anisotropic layer is that the length of delay from respect to the light of the direction of+40 ° of the normal direction rotations of layer plane of λ nm is not 0 for wavelength. Optical anisotropic layer 12 ' in this case plays negative c-plate, and can accurately compensate liquid crystal cells, especially VA-mode liquid crystal unit.

[polarizer]

Fig. 3 A-3D be show have of the present invention first or the schematic cross-section of the example of the polarizer of the optical compensating gage of the second embodiment (this and after, " optical compensating gage of the present invention " refers to the optical compensating gage according to the first and second aspects of the present invention). Usually by the dry polarization film that is formed by polyvinyl alcohol film and iodine, this film that stretches to be obtaining polarization film 21, and it is upper and prepare polarizer that

protective film

22 and 23 is adhered to two surface. Optical compensating gage of the present invention comprises by the film formed matrix of polymer thin of supporting optical anisotropic layer, thereby this matrix can directly be applied to

protective film

22 and 23 at least one. In this case, optical anisotropic layer 12 or 12 ' can place on polarization layer 21 sides, optical anisotropic layer 12 or 12 ' from polarization layer 21 than from matrix 11 more close to), perhaps can place on the opposition side of polarization layer 21 and (also be, optical anisotropic layer 12 or 12 ' compares farther from matrix 11 from polarization layer 21), wherein as shown in Figure 3A, optical anisotropic layer 12 or 12 ' preferably places on the opposition side of polarization layer 21. Can also shown in Fig. 3 B, it be bonded to the outside of the protective film 22 on polarization layer 21, wherein place contact adhesive simultaneously.

Fig. 3 C and 3D show that the polarizer of wherein constructing as shown in Figure 3A comprises the example arrangement of other functional layer 24 placed on it. Fig. 3 C shows that wherein other functional layer 24 places on the protective film 23 relative with optical compensating gage of the present invention; the representative configuration of wherein arranging polarization layer 21 simultaneously, Fig. 3 D shows that wherein other functional layer 24 places the representative configuration on the optical compensating gage of the present invention. Have no particular limits for other functional layer, this functional layer can be arbitrary those of various characteristics given, such as λ/4 layer, anti-reflection layer and hard conating. These layers usually can be bonded under the help of contact adhesive as the component of λ/4 plates, antireflective film or hardcoat film, perhaps for the situation of in Fig. 3 D, constructing, other functional layer 24 can be formed on the optical compensating gage of the present invention (optical anisotropic layer 12 or 12 '), then with the stacking polarization layer 21 that is bonded to of gained. Can also protective film 23 and optical compensating gage of the present invention is bonding, then with stacking other function film such as λ/4 plates, antireflective film or the hardcoat film of being bonded to of gained.

A pair of protective film and polarization film, three films altogether can be bonding in roll-to-roll mode. Not only from the angle of productivity ratio, and because polarizer is difficult for causing size to change or is curling, can give thus excellent mechanical stability, roll-to-roll bonding be preferred method.

[liquid crystal display]

Fig. 4 shows illustrative liquid crystal display of the present invention. Liquid crystal display comprises liquid crystal cells 35, it comprises the nematic liquid crystal layer that places between the upper and lower battery lead plate, with a pair of

polarizer

36 and 37 that places on liquid crystal cells 35 both sides, wherein, at least one polarizer adopts the polarizer of the present invention as shown in Fig. 3 A-3D. For the situation of wherein using polarizer of the present invention, between the battery lead plate of polarization layer and liquid crystal cells, arrange optical anisotropic layer. Under the help that is provided in the oriented layer on the electrode substrate and its surface that rubs, perhaps by structure such as rib (ribs) are provided, the control nematic liquid crystal has predetermined state of orientation.

On its lower side, can have the controlled made membrane 34 of one or more light between the liquid crystal cells between the polarizer, such as brightness enhancing films, diffusion film etc. Further on the lower side of the controlled made membrane of light, cremasteric reflex plate 32 and optical plate 33, reflecting plate 32 will be back to the front from the light radiation of cold cathode ray tube 31. Recent trend comprises using to have the straight rear type (straight-behind-type back light) backlight that several are arranged at the cold cathode ray tube under the liquid crystal cells, use LED as the LED-backlit of light source, use the organic or inorganic EL element to carry out the backlight of surface emitting with allowing, suitably use the described back light unit that is comprised of cold cathode ray tube and optical plate, wherein optical thin film of the present invention all is effective for the backlight of any type.

Although not shown in figures, only have for reflection LCD that a polarization film that is arranged at observer's side is enough, wherein, reflective film is arranged on the back side of liquid crystal cells, perhaps on the inner surface of the low matrix of liquid crystal cells. Certainly, also can use above-mentioned light source that front lighting is arranged on observer's side of liquid crystal cells. Passable is that display group is combined into semitransparent type, and transmissive portion and reflecting part wherein are provided in single pixel.

Next, material for the preparation of optical compensating gage of the present invention, method etc. will be described in detail.

Optical compensating gage of the present invention comprises residuite, polymeric layer and optical anisotropic layer, and wherein, the contrast that optical anisotropic layer helps to improve liquid crystal display guarantees the visual angle, and the image of elimination liquid crystal display is painted. By so that be used for to support the matrix of optical anisotropic layer also to play the effect of the protective film of polarizer; perhaps by so that optical anisotropic layer also plays the effect of the protective film of polarizer, optical compensating gage of the present invention can reduce the quantity of the component part that forms liquid crystal display. Adopt this embodiment also to help to make the liquid crystal display attenuation. Ensuing paragraph will for present embodiment describe for the preparation of materials and methods etc., it does not limit the present invention. With reference to following description and known method, also can adopt other embodiment. It should be understood that the present invention is not limited to the embodiment of optical compensating gage as described below.

Comprise that the optical compensating gage by the residuite of film formed optics single shaft of polymer thin or twin shaft and the optical anisotropic layer on this matrix can improve the optical characteristics of LCD significantly.

[optical anisotropic layer that forms by liquid-crystal composition]

As mentioned above, in the present invention, comprise that by curing optical compensating layer that the liquid crystal layer of at least a liquid-crystal compounds forms helps the optical compensation of liquid crystal cells.The embodiment that not only has the optical compensation effect of enough levels for wherein being attributable simply to optical anisotropic layer, and for wherein also allowing based on the embodiment that satisfies the optical compensation effect of enough levels with combining of other layer (for example supporting the matrix of optical anisotropic layer).In optical compensating gage of the present invention, optical anisotropic layer is formed by the composition that comprises at least a liquid crystal molecule.Liquid crystal molecule can be categorized as bar-shaped and dish type by geometry usually.Classification separately also comprises low-molecular-weight type and high molecular type.The high molecular type typically refers to that to have the degree of polymerization be 100 or above those (" Kobunshi Butsuri-Soten ' i Dainamikusu (PolymerPhysics-Phase Transition Dynamics); by Masao Doi; p.2; IwanamiShoten publishes; Publishers, 1992).In first embodiment of the present invention, can adopt the liquid crystal molecule of arbitrary type, wherein preferably use rod shaped liquid crystal molecule or dish type liquid crystal molecule.Can also use the potpourri of two or more rod shaped liquid crystal molecules, the potpourri of two or more dish type liquid crystal molecules, or the potpourri of rod shaped liquid crystal molecule and dish type liquid crystal molecule.More preferably optical anisotropic layer comprises rod shaped liquid crystal molecule with reactive group by use or the composition of dish type liquid crystal molecule forms, because this compound can reduce the change based on temperature and moisture, further further preferably at least a compound in potpourri has two or more reactive groups in single liquid crystal molecule.Liquid crystal molecule can be the potpourri of two or more compounds, and wherein preferably at least a compound has two or more reactive groups.The thickness of optical anisotropic layer is 0.1-20 μ m preferably, more preferably 0.5-10 μ m.

The optical compensating gage of second embodiment of the invention comprises the optical anisotropic layer that is formed by cholesteric liquid crystal compositions.The courage steroid spacing of optical anisotropic layer is 120nm or still less, and the thickness of optical anisotropic layer is 500nm or as many as 5 μ m or still less more.Composition preferably includes at least a cholesteric liquid crystal compound, more preferably comprise the polymerisable cholesteric liquid crystal compound with at least one polymerizable groups, thereby this layer can solidify by polymerization.For composition, it can form whole cholesteric phase is exactly enough, and therefore, and unnecessary this layer comprises any cholesteric liquid crystal compound.In this case, except that liquid crystal, arbitrary adjuvant comprises polymerization initiator and sequestrant, all is favourable for forming cholesteric phase.It is not necessary that liquid crystal molecule has polymerisable group, and on the contrary, chirality agent or any other adjuvant can have polymerisable group, and what also allow is to use the crosslinking chemical that has two or more polymerisable groups in individual molecule.Second embodiment of the present invention can adopt the liquid crystal molecule of any kind, wherein preferably uses rod shaped liquid crystal molecule.

The rod shaped liquid crystal examples for compounds comprises the phenyl pyrimidine compounds of azomethine compounds, azoxy compounds, cyanobiphenyl compounds, cyano-phenyl ester class, benzoates, cyclohexane carboxylic phenyl ester class, cyano-phenyl cyclohexanes compound, cyano group replacement, phenyl pyrimidine compounds, phenyl two  alkyl compounds, (diphenyl) acetylene compounds and the alkenyl cyclohexyl benzonitrile compounds that alkoxy replaces.Be not only and list in above-mentioned low-molecular-weight liquid-crystal compounds, also can use the liquid-crystal compounds of high molecular.

The liquid-crystal compounds of high molecular can obtain by the low-molecular-weight liquid-crystal compounds that polymerization has at least one polymerizable groups.In above-mentioned low-molecular-weight liquid-crystal compounds, preferably by the liquid-crystal compounds of formula (I) representative.

Formula (I): Q ¹-L ¹-A ¹-L ³-M-L ⁴-A ²-L ²-Q ²

In formula (I), Q ¹And Q ²Represent polymerisable group separately; L ¹, L ², L ³And L ⁴Represent singly-bound or divalent linker separately, preferably L ³And L ⁴In at least one representative-O-CO-O; A ¹And A ²Represent C separately _2-20The interval group.M represents mesomorphic group (mesogengroup).

In formula (I), Q ¹And Q ²Represent polymerisable group separately.Preferably addition polymerization of the polyreaction of polymerisable group (comprising ring-opening polymerization) or polycondensation.In other words, polymerisable group preferably can carry out the functional group of polyaddition reaction or polycondensation reaction.Polymerisable examples of groups is as follows.

L ¹, L ², L ³And L ⁴Represent divalent linker independently of one another, preferred representative is selected from following divalent linker :-O-,-S-,-CO-,-NR ²-,-CO-O-,-O-CO-O-,-CO-NR ²-,-NR ²-CO-,-O-CO-,-O-CO-NR ²-,-NR ²-CO-O-and NR ²-CO-NR ²-.R ¹²Represent C _1-7Alkyl or hydrogen atom.L preferably ¹And L ⁴In at least one representative-O-CO-O (carbonic acid group).Q preferably ¹-L ¹And Q ²-L ²Each is CH naturally ₂=CH-CO-O-, CH ₂=C (CH ₃)-CO-O-or CH ₂=C (Cl)-CO-O-CO-O-; They each CH naturally more preferably ₂=CH-CO-O-.

In the formula, A ¹And A ²Preferably represent C _2-20The interval group.More preferably they represent C separately _2-12Aliphatic group, more preferably they represent C separately _2-12Alkylidene group.Group is preferably selected from the chain group at interval, and can comprise at least one non-conterminous oxygen or sulphur atom.Group can have at least one substituting group such as halogen atom (fluorine, chlorine or bromine atom), cyano group, methyl and ethyl at interval.

Mesomorphic example by the M representative comprises any known mesomorphic group.Preferably by the mesomorphic group of formula (II) representative.

Formula (II) :-(W ¹-L ⁵) _n-W ²-

In following formula, W ¹And W ²Represent bivalent cyclic aliphatic group or divalent heterocyclic group separately; L ⁵Represent singly-bound or linking group.By L ⁵The example of the linking group of representative comprises by L in formula (I) ¹-L ⁴Those of institute's example and-CH ₂-O-and-O-CH ₂-.In the formula, n is 1,2 or 3.

W ¹And W ²Example comprise 1,4-cyclohexane two bases, 1,4-phenylene, pyrimidine-2,5-two bases, pyridine-2,5-two bases, 1,3,4-thiazole-2,5-two bases, 1,3,4- diazole-2,5-two bases, naphthalene-2,6-two bases, naphthalene-1,5-two bases, thiophene-2,5-two bases, pyridazine-3,6-two bases.1,4-cyclohexane two bases have two steric isomers, cis-trans isomeride, preferred trans-isomer.W ¹And W ²Can have at least one substituting group separately.Substituent example comprises halogen atom such as fluorine, chlorine, bromine or iodine atom; Cyano group; C _1-10Alkyl such as methyl, ethyl and propyl group; C _1-10Alkoxy such as methoxyl and ethoxy; C _1-10Acyl group such as formoxyl and acetyl group; C _2-10Alkoxy carbonyl such as methoxycarbonyl and ethoxy carbonyl; C _2-10Acyloxy such as acetoxyl group and propionyloxy; Nitro; Trifluoromethyl and difluoromethyl.

Include but not limited to as described below these by the preferred embodiment of the basic framework of the mesomorphic group of formula (II) representative.And described example can have at least one and be selected from above-mentioned substituting group.

By the examples for compounds of formula (I) representative include but not limited to as described below these.Compound by formula (I) representative can be by being described in the method preparation described in the Tokkohyo No.hei 11-513019 communique.

As mentioned above, first embodiment of the invention is preferably used the dish type liquid-crystal compounds.The case description that can be used for the dish type liquid-crystal compounds in first embodiment comprises being described in C.Destrade etc. in various documents, Mol.Cryst., Vol.171, the p.111 benzene derivative in (1981); Be described in C.Destrade etc., Mol.Cryst., Vol.122, p.141 (1985) and Physics Lett., A, Vol.78, the p.82 torxene in (1990); Be described in B.Kohne etc., Angew.Chem., Vol.96, the p.70 cyclohexane derivant in (1984); Be described in J.M.Lehn, J.Chem.Commu., p.1794 (1985) and J.Zhang etc., J.Am.Chem.Soc., Vol.116, the p.2655 inferior acetyl group macrocyclic compound of aza-crown (azacrown) base in (1994) or phenyl.The polymerization of dish type liquid-crystal compounds is described among Japanese Laid-Open Patent Application (Tokkai hei) No.8-27284.

For by the fixing dish type liquid-crystal compounds of polymerization, need with the dish type core of dish type liquid-crystal compounds with as substituent polymerizable groups bonding.Yet the Direct Bonding of polymerizable groups and dish type core makes and be difficult to keep desirable state of orientation during polyreaction.Therefore, between dish type core and each polymerizable groups, introduce coupling group.Therefore, the dish type liquid-crystal compounds with polymerizable groups is preferably by as shown in the formula those of (III) representative.

Formula (III): D (L-P) _n

In formula, D represents the dish type core; L represents divalent linker; P represents polymerizable groups; And n is the integer of 4-12.

The preferred embodiment of dish type core (D), each is described in (D1)-(D15) among Japanese Laid-Open Patent Application (Tokkai) No.2001-4837 naturally divalent linker (L) and polymerizable groups (P), (L1)-(L25) and (P1)-(P18); About dish type core (D), the description of divalent linker (L) and polymerizable groups (P) can preferably be applicable to this embodiment.

In second embodiment of the present invention, composition preferably comprises the cholesteryl liquid crystal with polymerizable groups.It is commercially available acquisition, by PaliocolorLC242 that comes from BASF Japan and Paliccolor LC756 representative.

In second embodiment of the present invention, the courage steroid spacing of optical anisotropic layer is 120nm or still less, is more preferably 100nm or still less, and being more preferably is 90nm or still less.There is not specific restriction for minimum limit value.The thickness of optical anisotropic layer is 500nm or as many as 5 μ m or still less more, is more preferably 600nm or as many as 4 μ m or still less more, and further being more preferably is 700nm or as many as 3 μ m or still less more.Excessive spacing is increased in the light leak in the black state undesirablely, and therefore reduces contrast.Excessive thickness also thickens polaroid unfriendly or reduces slaking.On the contrary, the too small thickness above above-mentioned scope makes that undesirablely the unevenness in the film thickness is more obvious.

In second embodiment of the present invention, regulate courage steroid spacing based on the type and the quantity of the chirality agent that adds.For the purpose that reduces courage steroid spacing, the chirality agent that needs selection to have big as far as possible screw twisted power, and the addition of increase chirality agent.In order to add a large amount of chirality agent, the chirality agent preferably comprises at least one reactive group.Reactive group is the ethylenic unsaturated group preferably, especially (methyl) acrylic acid groups.More particularly, can preferably use to be described in EP1388538 A1 the chirality agent in the 16th and 17 page.

In second embodiment of the present invention, when the layer that will form by coating cholesteric liquid crystal compositions to surface with nonpolarized light irradiation during with the formation optical anisotropic layer, the optical anisotropic layer that is obtained becomes negative c-plate, it has optical axis in the normal direction of sheet, do not postpone because produce in the face.On the other hand, when the layer that will form by coating cholesteric liquid crystal compositions to surface with polarizing light irradiation when forming optical anisotropic layer, the optical anisotropic layer that is obtained becomes the twin shaft medium, because delay in the generation face.According to second embodiment, can use to comprise the optical compensating gage that is used as negative c-plate and is used as the optical anisotropic layer of twin shaft medium separately.

In the present invention, optical anisotropic layer display optical characteristic makes utilizes the interior slow axis of face as sloping shaft (turning axle), is the mutually the same substantially from+40 ° of length of delays with the light measurement of-40 ° direction of normal direction rotation with respect to layer plane respectively of λ nm for wavelength.Use the rod shaped liquid crystal compound to form the film that shows biaxiality, need or reverse in reversing courage steroid orientation and mix oriented rod-shaped molecular in the courage steroid orientation, wherein, the pitch angle of molecule changes on thickness direction gradually, then, the courage steroid orientation reversed of the distortion of the irradiation by polarized light (distort) or the mixing courage steroid orientation of reversing.The example of the method by the polarizing light irradiation twisted-oriented comprises the method (WO 03/054111 A1) of utilizing dichromatism polymerizable mesogenic initiating agent and utilizes to have the method (Japanese Laid-Open Patent Application " Tokkai " No.2002-6138) that light can be orientated the rod shaped liquid crystal compound of functional group such as cinnamoyl in its molecule.The present invention can adopt any in these methods.

In second embodiment, in order to obtain optical anisotropic layer as negative c-plate, optical anisotropic layer preferably shows to be that 0 front postpones substantially, and utilize in the face slow axis as sloping shaft (turning axle), described optical anisotropic layer is that the length of delay from respect to the light of the direction of+40 ° of the normal direction rotations of layer plane of λ nm is not 0 for wavelength.The optical anisotropic layer that shows above-mentioned optical characteristics can be transferred in the cholesteric phase by making the layer that is formed by the composition that can show cholesteric phase by description preparation as above, shines with nonpolarized light then.

For the situation of wherein utilizing the dish type liquid crystal molecule with polymerizable groups in first embodiment of the present invention, the liquid-crystal compounds molecule can be fixed to the state of orientation of planar orientation or twist alignment.It is parallel with the horizontal plane of residuite that planar orientation means the dish plane of dish type liquid crystal molecule core.Yet, in this manual, and not requiring that the core strictness of dish type molecule is parallel to the horizontal plane orientation, the pitch angle that differs less than 10 ° with horizontal plane allows.

In first embodiment of the present invention, the Re that optical anisotropic layer shows is 5-250nm, and more preferably 10-100nm is more preferably 20-80nm.With the Rth of residuite, Rth is 30-500nm preferably, and more preferably 40-400nm is more preferably 100-350nm.

In second embodiment of the present invention, optical compensating gage as a whole, the front that preferably has postpones (Re) and is 0-70nm, show and to utilize in the face slow axis, for being 30-150nm from the measured delay Re of light with respect to the direction of 40 ° of the normal direction rotations of layer plane as sloping shaft (turning axle).Therein in the embodiment of optical anisotropic layer as the twin shaft medium, optical compensating gage as a whole, be more preferably the front delay (Re) that has and be 20-70nm, show and utilize the interior slow axis of face as sloping shaft (turning axle), for being 50-150nm from the measured delay Re of light with respect to the direction of 40 ° of the normal direction of layer plane rotations, show more preferably that further the former is 30-60nm, the latter is 65-130nm.Therein in the embodiment of optical anisotropic layer as negative c-plate, optical compensating gage as a whole, it is 0-5nm that the preferred front that shows postpones (Re), show and utilize the interior slow axis of face as sloping shaft (turning axle), for being 20-60nm from the measured delay Re of light with respect to the direction of 40 ° of the normal direction of layer plane rotations, show more preferably that further the former is 0-3nm, the latter is 25-50nm.

The situation of piling up for wherein two or more optical anisotropic layers that form by liquid-crystal composition in the present invention, combination for liquid-crystal composition does not have specific restriction, therefore, above-mentioned piling up can be following any, those that form by the liquid-crystal composition that all comprises the dish type liquid crystal molecule, those that form by the liquid-crystal composition that all comprises rod shaped liquid crystal molecule, perhaps those that form by the liquid-crystal composition that comprises dish type liquid crystal molecule and rod shaped liquid crystal molecule respectively.Combination for the state of orientation of each layer does not have specific restriction, makes piling up of optical anisotropic layer have identical state of orientation or makes piling up of optical anisotropic layer have different state of orientation.

Optical anisotropic layer can comprise liquid-crystal compounds by applying, and if necessary, the polymerization initiator as described below or the coating liquid of other adjuvant are applied to the surface of oriented layer and form.The solvent that is used to prepare coating liquid is organic solvent preferably.The example of organic solvent comprises that acid amides is (as N, dinethylformamide), sulfoxide (as dimethyl sulfoxide), heterogeneous ring compound (as pyridine), hydro carbons (as benzene, hexane), alkyl halide (as chloroform, methylene chloride), ester (as methyl acetate, butyl acetate), ketone (as acetone, methyl ethyl ketone), and ether (as tetrahydrofuran, 1, the 2-dimethoxy-ethane).Preferred alkyl halogenide and ketone.Two or more organic solvents can be used in combination.Apply coating liquid by known technology, (be described in US patent No.2 as dip coated method, air knife rubbing method, curtain coating method, rolling method, tinsel-excellent rubbing method, intaglio plate rubbing method, reverse intaglio plate rubbing method, mould rubbing method and extrusion coated method, in 681,294).Can form multilayer simultaneously.The coating process that forms multilayer simultaneously is described in US patent No.2,761,791, No.2,941,898, No.3,508,947 and No.3, in 526,528, and Harasaki Yuji " Coating Engineering " the 253rd page, published by AsakuraSyoten in 1973.

[liquid crystal molecule in the fixed orientation state]

For preparation optical compensating gage of the present invention, the preferably liquid crystal molecule in the fixed orientation state under not upset state.Preferably, fix by the polyreaction that is contained in the polymerizable groups in the liquid crystal molecule.Polyreaction comprises heat polymerization that utilizes thermal polymerization and the photopolymerization reaction that utilizes Photoepolymerizationinitiater initiater.The preferred light polyreaction.The example of Photoepolymerizationinitiater initiater comprises that the alpha-carbonyl compound (is described in US patent Nos.2,367,661 and 2, in 367,670), the acyloin ethers (is described in US patent No.2, in 448,828), the fragrant acyloin compound that α-hydrocarbon replaces (is described in US patent No.2, in 722,512), the multinuclear naphtoquinone compounds (is described in US patent Nos.3,046, in 127 and 2,951,758); The combination of triarylimidazoles dimer and p-aminophenyl ketone (is described in US patent No.3,549, in 367), acridine and compound phenazine (are described in Japanese Laid-Open Patent Application (Tokkai) syo No.60-105667 and US patent No.4,239, in 850) and  diazole compounds (be described in US patent No.4,212,970 in).

The content of Photoepolymerizationinitiater initiater to be used is based on the solid in the coating liquid preferably 0.01-20 weight %, more preferably 0.5-5 weight %.The UV ray is preferably used in the radiation that is used for the polymerisable liquid crystal molecule.Radiation energy is 20mJ/cm preferably ²-50J/cm ², be more preferably 100mJ/cm ²-800mJ/cm ²Radiation can be carried out under heating, to promote photopolymerization reaction.

[orientation that the polarized light radiation causes]

(photic orientation)

In optical compensating gage of the present invention, optical anisotropic layer can show in the face owing to the photic orientation under the assistance of polarized light radiation and postpone.Can with photopolymerization process in fixed orientation in carry out the polarized light radiation, perhaps the polarized light radiation is formerly carried out, carry out the nonpolarized light radiation then with further fixing, the nonpolarized light radiation that perhaps is used for fixing is formerly carried out the polarized light radiation then with photic orientation.In order to obtain big delay, preferably only carry out the polarized light radiation, perhaps at first carry out the polarized light radiation.The polarized light radiation preferably have oxygen concentration be 0.5% or lower inert gas atmosphere in carry out.Radiation energy is 20mJ/cm preferably ²-10J/cm ², be more preferably 100-800mJ/cm ²Brightness is 20-1000mW/cm preferably ², 50-500mW/cm more preferably ², further 100-350mW/cm more preferably ²Type for the liquid crystal molecule by the polarized light radiation curing does not have specific restriction, wherein preferably has the liquid crystal molecule of ethylenic unsaturated group as reactive group.

The optical anisotropic layer that postpones in the face of demonstration owing to the photic orientation under the assistance of polarized light radiation is excellent for the optical compensation of the LCD of VA pattern particularly.

For preparation optical compensating gage of the present invention, be applied on the surface of the particular polymers layer of describing in the back at the coating liquid that will comprise liquid-crystal composition after, form the layer that comprises liquid-crystal composition thus, when solidifying this layer by the irradiation ionizing radiation, the film surface temperature of preferably regulating this layer is 70-160 ℃.By in the scope of described film surface temperature, being cured reaction, motion at the reactive group on polymeric layer surface can be activated, thereby molecule in the layer that is formed by liquid-crystal composition and the reaction ratio that has in polymeric layer between the molecule of reactive group can increase, and improve cohesive therebetween thus.From the activated molecule motion angle, film surface temperature is preferably than the high 1-30 of glass transition temperature ℃ of the polymerizable compound of forming polymeric layer, preferred high 5-25 ℃.By curing reaction is carried out, improved the motion of molecule significantly under than the high film surface temperature of the glass transition temperature that is contained in the polymerizable compound in the polymeric layer.Although the film surface temperature before curing schedule is measured by the back side that thermopair is placed matrix, the layer that this matrix support is formed by the liquid-crystal composition that is applied thereto, but preferably by using the noncontact radiation thermometer to carry out the direct measurement of the film surface temperature of this layer.

[planar orientation agent]

At least a compound by formula as follows (1), (2) or (3) representative is added to the composition that is used to form optical anisotropic layer, to promote that liquid crystal molecule flatly is orientated.It should be noted that term " planar orientation agent " is meant that for rod shaped liquid crystal molecule the major axis and the layer plane of its molecule are parallel to each other, for the dish type liquid crystal molecule, the dish plane and the layer plane of its core are parallel to each other.Yet, do not need them accurately parallel to each other, in this manual, term " planar orientation " should be understood that molecule wherein is oriented and has state of orientation that are lower than 10 degree with respect to the pitch angle of layer plane.The pitch angle is preferably the 0-5 degree, and more preferably the 0-2 degree most preferably is 0 degree.

Below describe formula (1) in detail to (3).

Formula (1)

In the formula, R ¹, R ²And R ³Represent hydrogen atom or substituting group separately; X ¹, X ²And X ³Represent singly-bound or divalent linker separately.

Formula (2)

In the formula, R represents substituting group; M is the integer of 0-5.When m is 2 or when bigger, a plurality of R can be same to each other or different to each other.

Formula (3)

In the formula, R ⁴, R ⁵, R ⁶, R ⁷, R ⁸And R ⁹Represent hydrogen atom or substituting group separately.

The example that can be used for the planar orientation agent among the present invention comprises and is described among Japanese Laid-Open Patent Application (Tokkai) No.2005-099248 those, and the method that is used for preparing described compound is described in the document.

Amount by the compound of formula (1), (2) or (3) representative is preferably 0.01-20 weight %, and more preferably 0.01-10 weight % is more preferably 0.02-1 weight %.As the planar orientation agent, can be used alone the compound of the formula of being selected from (1), (2) or (3), perhaps be used in combination the compound that two or more are selected from formula (1), (2) or (3).

[oriented layer]

For orientation (ideally, hybrid orientation) liquid crystal molecule, can use polymeric layer as oriented layer.Can be by the following oriented layer that is provided among the present invention, the layer that friction is formed by organic compound (preferred polymers); The inclination vapor deposition; Formation has the layer of microflute; Perhaps by Langmuir-Blodgett (LB) film process deposition organic compounds (as ω-tricosanic acid, two octadecyl methyl ammonium chloride and methyl stearate).In addition, also knownly give oriented layer orientation function by being exposed to electric field or magnetic field or rayed.Friction treatment can be by carrying out for several times the mantle friction of polymeric layer with any direction with paper or cloth.

Oriented layer can be by (being described in US patent No.2 with coating liquid according to any known method such as dip coated method, air knife rubbing method, curtain coating method, rolling method, tinsel-excellent rubbing method, intaglio plate rubbing method and extrusion coated method, 681,294) be applied to the surface and prepare.Can form multilayer simultaneously.The coating process that forms multilayer simultaneously is described in US patent No.2,761,791, No.2,941,898, No.3,508,947 and No.3, in 526,528, and Harasaki Yuji " Coating Engineering " the 253rd page, published by AsakuraSyoten in 1973.

In the present invention, the preferred polymeric layer that forms by coating and the dry solution that comprises at least a polymerizable compound that uses more preferably uses the polymeric layer that forms by coating and the dry solution that comprises at least a polymerizable compound and the solvent compositions with 20 weight % or more water as oriented layer as oriented layer.Oriented layer is preferably by using polymer solution to form.Can determine the type of suitable polymerizable compound according to the orientation (being meant the pitch angle especially) of liquid-crystal compounds.For example, can use and not reduce the orientation that polymkeric substance that being selected from of surface energy be generally used for preparing oriented layer makes the molecular level of liquid-crystal compounds.The case description of polymkeric substance is in the various documents about liquid crystal cells or optical compensating gage.Preferred examples comprises polyvinyl alcohol (PVA) or modified polyethylene alcohol; Polyacrylic acid or with polyacrylic multipolymer; Polyvinylpyrrolidone; Cellulose with cellulose or modification.Any oriented layer preferably comprises polymerizable groups, improving oriented layer and the cohesive between the optical anisotropic layer that forms on this oriented layer surface, and avoids optical anisotropic layer to peel off from residuite.Polymkeric substance with polymerizable groups can be selected from following polymkeric substance, is included in the polymkeric substance of the repetitive that has any polymerizable groups on its side chain and has cyclic group as substituent polymkeric substance.More preferably use in the oriented layer that can form chemical bond at the interface with liquid-crystal compounds; the particularly preferred example of this oriented layer is a modified polyethylene alcohol; be described among Japanese Laid-Open Patent Application " Tokkaihei " No.9-152509, it has the acrylic acid groups of utilizing acid chloride or Karenz MOI (ShowaDenko K.K. ProductName) to introduce on its side chain.The thickness of oriented layer is 0.01-5 μ m preferably, more preferably 0.05-2 μ m.

According to the present invention, optical anisotropic layer can make on the oriented layer of temporary transient orientation, and by using contact adhesive that it is transferred on the residuite, still from the angle of throughput rate, preferably this process does not comprise transfer step usually.

[residuite]

According to the present invention, can use the matrix of supporting optical anisotropic layer.This matrix optimization is transparent, particularly preferably has to be not less than 80% light transmission.The thickness of matrix is preferably the 10-500 micron, and more preferably the 20-200 micron is more preferably the 35-110 micron.

Matrix optimization ground is not less than 70 ℃ by having glass transition temperature (Tg), and more preferably 75-200 ℃, the polymkeric substance that is more preferably 80-180 ℃ forms.The residuite that is formed by described polymkeric substance not only has good thermotolerance but also have good molding processibility.

The Re value of matrix is preferably-200 to 100nm, and the Rth value of matrix is preferably-100 to 100nm.The Re value is more preferably-50 to 30nm, is more preferably-30 to 20nm.Utilize cellulose acylate film as matrix; the birefringence of film is than (Δ n: nx-xy) 0-0.02 preferably; film is at the length of delay of thickness direction; (nx+ny)/2-nz}; preferably 0-0.04. it should be noted that in this manual; film with negative Re has slow axis in the face in the TD direction usually, and the refractive index ratio that the film with negative Rth has at thickness direction usually bigger at in-plane.

Yet the example that is included in the polymkeric substance in the matrix is not limited to these, comprises cellulose esters, as cellulose ethanoate, and cellulose propionate and cellulose butylate; Polyolefin is as the norborene based polyalcohol; Poly-(methyl) acrylate, as polymethylmethacrylate, polycarbonate, polyester and polysulfones.The polymkeric substance (for example, norborene based polyalcohol, " ARTON " and " ZEOROR " that is provided by ZEON CORPORATION that provide by JSR) of commercially available acquisition can be provided.

The effect of the protective film of all right polarizing film of matrix, in this case, matrix optimization ground is formed by cellulose esters, more preferably is the cellulose esters of low fatty acid.Term " low fatty acid " is meant the fatty acid with 6 or carbon atom still less.The quantity of carbon atom is 2 (cellulose ethanoates) preferably, 3 (cellulose propionates) or 4 (cellulose butylates).Can use fatty acid ester such as the cellulose acetate propionate and the cellulose acetate butyrate of mixing.In the cellulose esters of low fatty acid, cellulose ethanoate most preferably.The acidylate degree of cellulose esters is 2.50-3.00 preferably, is more preferably 2.75-2.95, and being more preferably is 2.80-2.90.

The viscosity average polymerization degree of cellulose esters (DP) is preferably 250 or bigger, and more preferably 290 or bigger.In addition, cellulose esters has the narrow molecular weight distribution (Mw/Mn by gel permeation chromatography; Mw be weight-average molecular weight and Mn is a number-average molecular weight).Especially, the Mw/Mn value is preferred in the scope of 1.0-5.0, more preferably in the scope of 1.3-3.0, most preferably in the scope of 1.4-2.0.

Do not replace equably at 2-, the 3-of cellulose esters and all hydroxyls of 6-position, the hydroxyl in the 6-position is tending towards replacing relatively poorly.According to the present invention, preferred use be substituted in the 6-position hydroxyl almost with the identical or more cellulose esters of hydroxyl in the replacement of 2-or 3-position.With respect to the total degree of substitution in 2-and 3-position, the ratio of the degree of substitution of 6-position is preferably 30-40%, more preferably is not less than 3 1%, is more preferably and is not less than 32%.At the degree of substitution of 6-position preferably 0.88 or bigger.Hydroxyl in cellulose esters on the 6-position can be had the acyl substituted of 3 or more carbon atoms by any except that acetyl group, as propiono, bytyry, valeryl, benzoyl and acryloyl group.Measure the degree of substitution that can obtain respectively at all locational hydroxyls by NMR.The cellulose esters that has high substituted degree on the 6-position can be by known synthetic route preparation, for example be described in the synthetic example No.1 of the section 0043-0044 among Japanese Laid-Open Patent Application (Tokkaihei) No.11-5851, the synthetic example No.3 of the synthetic example No.2 of section 0048-0049 and section 0051-0042.

Can add plastifier in the cellulose ester film to improve mechanical property or to improve rate of drying.Phosphate or carboxylate can be used as plastifier.The example of phosphate comprises triphenyl phosphate (TPP) and tricresyl phosphate (TCP).Carboxylate is by phthalic ester and citrate representative.The example of phthalic ester comprises repefral (DMP), diethyl phthalate (DEP), dibutyl phthalate (DBP), dioctyl phthalate (DOP), diphenyl phthalate (DPP) and di (2-ethylhexyl) phthalate (DEHP).The example of citrate comprises triethyl o acetyl citrate (OACTE) and tributyl o acetyl citrate (OACTB).The example of other carboxylate comprises butyl oleate, ricinoleic acid methyl acetyl ester, dibutyl sebacate and various trimellitate (trimeritic esters).Wherein, preferably use phthalic acid ester group plastifier (DMP, DEP, DBP, DOP, DPP, DEHP).Preferred especially DEP and DPP.Based on the amount of cellulose esters, the addition of plastifier is 0.1-25 weight % preferably, is more preferably 1-20 weight %, most preferably is 3-15 weight %.

Antidegradant (for example, antioxidant, peroxide decomposer, free radical inhibitors, metal inactivator, sour trapping agent, amine) can be joined in the cellulose ester film.Antidegradant is described among Japanese Laid-Open Patent Application " Tokkaihei " No.3-199201, the same No.5-1907073, the same No.5-194789 and the same No.5-271471 and the same No.6-107854.Based on the amount of solution to be prepared (dope), the addition of antidegradant is preferably in the scope of 0.01-1 weight %, more preferably in the scope of 0.01-0.2 weight %.If this addition is lower than 0.01 weight %, the effect of antidegradant is not discernable so.If addition is greater than 1 weight %, antidegradant leaks on the surface of film.The particularly preferred example of antidegradant comprises Yoshinox BHT (BHT) and tribenzylamine (TBA).The dyestuff that can also add trace goes out (piping) to prevent photoconduction.From the angle of transmittance, preferably selecting the type of dyestuff and content is 50% or bigger with the optical transmission ratio that is adjusted in the 420nm place.The addition of dyestuff is preferably 0.01ppm to 1ppm.

For Re or the Rth value of controlling film, can add to cellulose ester film and postpone controlling agent arbitrarily.Based on the cellulose esters of 100 weight portions, the content of delay controlling agent is the 0.01-20 weight portion preferably, and more preferably the 0.05-15 weight portion is more preferably the 0.1-10 weight portion.Two or more can be postponed controlling agent is used in combination.The example of delay controlling agent etc. is described among WO 01/88574 and the WO 00/2619, and among Japanese Laid-Open Patent Application (Tokkai) Nos.2000-111914 and the 2000-275434.

Cellulose ester film can be by using dope (dope), and in other words, the solution that comprises cellulose esters and other composition makes according to solvent cast method (solvent cast method).Dope is poured on the surface of tube or band, and dry with evaporating solvent, form film thus.Before cast, the solid content of dope is preferably 10-40 weight %.Solid content is 18-35 weight % more preferably.Can pour into a mould a plurality of dopes simultaneously to form a plurality of pouring layers.Mirror polish (mirror finish) is preferably stood on the surface of tube or band.

About the various subject descriptions of the cast of solvent cast method and dry technology in US patent Nos.2,336,310,2,367,603,2,492,078,2,492,977,2,492,978,2,607,704,2,739,069 and 2,739,070, BrP Nos.640,731 and 736,892, among Japanese patent publication (Tokkosyo) Nos.45-4554 and 49-5614 and Japanese Laid-Open Patent Application (Tokkaisyo) Nos.60-176834,60-203430 and the 62-115035.

Wait preferably 10 ℃ or lower of tube of being poured into a mould or the surface temperature of being with.Preferably use air-dry dry dope 2 seconds or more.With the film that obtains sur-face peeling from tube or band, and further dry with the evaporation of residual solvent.Carry out drying according to the method that is described among Japanese patent publication (Tokkohei) No.5-17844, wherein the air-dry dry film of peeling off that changes 100-160 ℃ of order with temperature.Utilizing described method can shorten from being poured into peels off required process time.In order to carry out this method, need dope under the surface temperature of tube of waiting to be poured into a mould or band, to become gel.Multiple cellulose ester solution can be poured into a mould simultaneously, can pour into a mould solution from a plurality of pouring nozzles that separate each other of arranging along transmission direction respectively, to form multilayer film (referring to Japanese Laid-Open Patent Application (Tokkaisyo) No.61-158414 and Japanese Laid-Open Patent Application (Tokkaihei) Nos.1-122419 and 11-198285).Cellulose ester solution can be from two pouring nozzle cast to form film (referring to open (Tokkosyo) Nos.60-27562 of Japanese laid-open patent, 61-94724,61-947245,61-104813 and 61-158413 and Japanese Laid-Open Patent Application (Tokkaihei) No.6-134933).Can using wherein, high viscosity cellulose ester solution stream is surrounded and pouring procedure (referring to Japanese Laid-Open Patent Application (tokkaisyo) No.56-162617) high and that low viscosity solution is extruded simultaneously by the plain ester solution of low viscous fiber.

Cellulose ester film can further regulated by stretching aspect the delay.Draw ratio is preferably 3-100%.Preferred stenter stretches.Consider and accurately control slow axis, preferred velocity contrast and the release time that reduces a left side and right tenter clip gap as much as possible.Stretching is described in 338 pages of eighth rows of the 337th page of eighth row to the of WO01/88574.

Cellulose ester film can stand surface treatment.The surface-treated example comprises Corona discharge Treatment, glow discharge processing, flame treatment, acid treatment, alkali treatment and treatment with uv radiation.Consider the flatness that keeps film, preferably be not higher than Tg (glass transition temperature), especially the temperature of regulating cellulose ester film in 150 ℃ or the lower surface treatment.

The thickness of the cellulose ester film that makes by solvent cast is based on flanging flow velocity (lip flowrate) and linear speed, and it is adjustable perhaps stretching or shrink.Because for main material to be used, the perviousness of moisture is different, therefore regulates thickness and makes and moisture permeable can be adjusted in the scope that protective film needs.The free volume of the cellulose ester film that is made by solvent cast is adjustable by baking temperature and time.In addition in this case, because for main material to be used, the perviousness of moisture is different, therefore regulates free volume and makes and moisture permeable can be adjusted in the scope that protective film needs.Use adjuvant to regulate the water wettability and the hydrophobicity of cellulose ester film.Hydrophilic additive is added to the free volume perviousness that can moisturize, on the contrary, adds hydrophobic additive and can reduce moisture permeable.As mentioned above; in the feasible protective film preferred range that moisture permeable can be adjusted to of the moisture permeable of regulated by various methods cellulose ester film for polaroid; make to support the also effect of polarizing plate protective film of matrix of optical anisotropic layer, make can be low-cost and high productivity prepare the polaroid of display optical compensate function.

[polaroid]

The polaroid that is used for LCD of the present invention comprises the polarization film and a pair of protective film of the described polarization film of clamping therein.The example of polarization film comprises the polarization film that contains iodine, uses the polarization film that contains dyestuff and the polyenoid alkyl polarization film of dichroic dye.Usually use PVA-based film preparation to contain the polarization film and the polarization film that contains dyestuff of iodine.Type for protective film has no particular limits, and the example comprises cellulose esters such as cellulose ethanoate, cellulose acetate butyrate and cellulose propionate; Polycarbonate; Polyolefin; Polystyrene; And polyester.Transparent protective film provides with the form of roller usually, and is bonded to long polarization film in a continuous manner, thereby preferably machine-direction oriented with it.At this, the axis of orientation of protective film (slow axis) can be with any direction orientation.Have no particular limits for the angle between the absorption axes (tensile axis) of the slow axis (axis of orientation) of protective film and polarization film, based on the purpose of polaroid can be suitable setting.

Use water-based adhesive that polarization film and protective film is bonding.The solvent that is included in the water-based adhesive is dry in passing through the diffusion process of protective film.The moisture permeable that protective film is bigger causes dry faster and higher productive rate, but is based on the environment for use of LCD, and too big moisture permeable also makes more moisture be included in the polarization film, reduces polarization capacity thus.Determine the moisture permeable of optical compensating gage by thickness, free volume and the hydrophobicity of thin polymer film (with the polymerisable liquid crystal molecule).The moisture permeable of the protective film of polaroid is preferably at 100-1000 (g/m ²In the scope of)/24 hour, more preferably at 300-700 (g/m ²In the scope of)/24 hour.

In the present invention, for the purpose of attenuation, a protective film of polarization film can be used to support optical anisotropic layer, perhaps can be not support other layer except optical anisotropic layer.Consider that the sum of errors that prevents optical axis prevents to accumulate dust or other foreign matter, optical anisotropic layer and polarization film preferably are fixed by bonding.Can adopt suitable method as utilizing the bonding of transparent adhesive layer by bonding piling up.Type for bonding agent has no particular limits, wherein in view of the change that prevents the component optical characteristics, those bonding agents that do not need pyroprocess in the curing of adhesion process and drying are preferred, preferably do not need those of long set time or drying time.Consider from this point, preferably use hydrophilic polymer-matrix bonding agent and pressure sensitive adhesive layer.

For various purposes; comprise water resistance, on one or two surface of polarization film, can also use the polaroid that wherein is formed with protective film, be equal to those of protective film; perhaps suitable functional layer such as anti-reflection layer and/or anti-dazzle photosphere are intended to prevent surface reflection.Anti-reflection layer can typically be formed as optical interference film suitably, as the fluorine-containing polymer-coated layer or the film of multiple layer metal deposition.To give the surface meticulous scrambling, can form the anti-photosphere of dazzling based on suitable system, contain the coating layer of the resin of particle as formation, embossing, sandblast, etching etc., thus make surface reflection with diffusion.

The example that is applicable to the material of particle comprises arbitrary inorganic particle, two or more inorganic particles, randomly has electrical conductance, as silicon dioxide, calcium oxide, aluminium oxide, titania, zirconia, tin oxide, indium oxide, cadmium oxide and antimony oxide; And crosslinked or uncrosslinked organic fine particle such as polymethylmethacrylate and the polyurethane formed by suitable polymers, its average particle size particle size that has is 0.5-20 μ m.As the result who contains these particles, adhesive phase and pressure sensitive adhesive layer can have the light diffusing energy.

The optical characteristics of the polaroid that comprises protective film, polarizer and residuite of the present invention and the performance of the superelevation contrast product (for example, the HLC2-5618 of Sanritz Corporation) that durability (short-term and extended storage stability) preferably is equal to or is better than commercially available acquisition.More particularly, polaroid preferably has 42.5% or bigger visible transmission ratio, degree of polarization { (Tp-Tc)/(Tp+Tc) } ^1/2〉=0.9995 (wherein, Tp is parallel transmittance, Tc is the quadrature transmittance), 60 ℃, 90%RH left standstill 500 hours and in dry atmosphere 80 ℃ leave standstill 500 hours before and the rate of change of afterwards transmittance, based on absolute value, be 3% or still less, be more preferably 1% or still less, the rate of change aspect degree of polarization is based on absolute value, be 1% or still less, be more preferably 0.1% or still less.

Have no particular limits for the display mode that is applied to the LCD among the present invention, wherein preferably adopt the VA pattern.It should be understood that the LCD that is used for the present invention is effectively for the VA pattern not only, and also be effective for the STN pattern in the embodiment, TN pattern and ocb mode.

[VA mode LCD]

Liquid crystal cells among the present invention is vertical alignment mode (VA-pattern) preferably.VA mode liquid crystal unit comprises upper and lower matrix with friction surface respect to one another and the liquid crystal molecule of sealing with negative dielectric anisotropic therebetween.For example, have about Δ n=0.0813 and Δ ε=-4.6 and have guiding (director) or the so-called liquid crystals preparation liquid crystal cells that is about 89 ° pitch angle that shows the direction of liquid crystal aligning by use.In this case, the thickness d of liquid crystal layer can be adjusted to about 3.5 μ m.The brightness that white level shows changes based on the product Δ nd of thickness of liquid crystal layer d (nm) and refractive index anisotropy Δ n.Consider to obtain maximum brightness that preferably the thickness d of liquid crystal layer is regulated, Δ n regulates in the scope of 0.060-0.085 in the scope of 2-5 μ m (2000-5000nm).

The upper and lower matrix of liquid crystal cells has the transparency electrode that is formed on its inside surface, wherein the liquid crystal molecule in liquid crystal layer is applied under the not mode of operation on the electrode and the subvertical orientation of stromal surface at no-voltage, thereby changes hardly by the polarized state of light of liquid crystal panel.Because the absorption axes of the absorption axes of the upper polarizer 37 of liquid crystal cells and the following polaroid 36 of liquid crystal cells is almost orthogonal, so light can not pass through polaroid.In other words, the black state that under mode of operation not, can realize ideal of the LCD of VA pattern.Down opposite with mode of operation, liquid crystal molecules tilt in the surperficial parallel direction of matrix, thereby can change its polarization state by the light of liquid crystal panel, can pass through polaroid.

Aforesaid description shows below situation, wherein use and have negative dielectric anisotropic and corresponding liquid crystal molecule perpendicular to direction of an electric field, owing between last matrix and following matrix, apply electric field, wherein, can also use liquid crystal material with positive dielectric anisotropy, for matrix situation of placing electrode only wherein, and electric field apply surperficial parallel with matrix.

The VA pattern feature is that it responds and high-contrast fast.Yet problem is that in oblique view, contrast is lowered, although positive contrast is high.Liquid crystal molecule under black state is with respect to the Surface Vertical ground orientation of matrix, thereby liquid crystal molecule shows birefringence hardly in positive visual angle, therefore obtain low transmissivity and high contrast.Yet liquid crystal molecule shows birefringence in the inclination visual angle.In addition, the intersecting angle of the absorption axes of upper and lower polaroid is 90 ° of quadratures, but becomes greater than 90 ° in the inclination visual angle.Owing to these two factors, display becomes in the inclination visual angle and is easy to cause light leak, is tending towards reducing contrast.In order to overcome this problem, the present invention adopts at least one optical anisotropic layer with predetermined optical characteristics that is provided on the residuite.

Liquid crystal molecule in the VA mode display is in the white states medium dip, wherein when the birefringent amplitude when vergence direction is observed and observe the other way around different, the difference between this generation brightness and the tone.In order to overcome this problem, preferably adopt multiple domain system (multi-domain system) for liquid crystal cells.Multiple domain is meant the structure that a plurality of territories that wherein state of orientation is different form in single pixel.For example, the VA mode unit based on the multiple domain system has the different a plurality of territories, angle of inclination that applying liquid crystal molecule under the voltage in single pixel.Making based on the VA mode liquid crystal unit of multiple domain system can the pitch angle to the liquid crystal molecule between pixel and the pixel be averaged under the voltage applying, and makes on average viewing angle characteristic thus.A plurality of territories that the liquid crystal molecular orientation direction is different in single pixel can be typically by groove or projection are provided to electrode, change the direction of electric field, perhaps in electric field, produce heteropical method and form.Division numbers be increased in that the balance visual angle is successful in all directions, but under white states, reduce transmittance, thereby the preferred quartern.

In the VA mode LCD, do not add the chirality agent that generally is used for nematic mode (TN pattern) LCD usually, because the chirality agent can cause degraded in dynamic response characteristic, but can add in order to reduce the orientation failure.The zone boundary that liquid crystal molecule is divided orientation does not therein respond very much.Because according to common black display, black state can not be kept, produce the problem that brightness is lowered.Add the chirality agent and to liquid crystal, help to shrink this borderline region.

Embodiment

Following paragraph will describe the present invention in detail with reference to embodiment.It will be appreciated that the material, reagent, quantity and consumption ratio, the operation etc. that show among the following embodiment are not deviating under the spirit of the present invention and can be changed suitably.Therefore the present invention is not limited to embodiment as described below.

(preparation residuite S-1)

With Fujitac TD80UF (Fuji Photo Film Co., Ltd., product, Re=3nm, Rth=50nm, the acetate films of commercially available acquisition) as residuite S-1.

(preparation residuite S-2)

Following composition is placed mixing tank, under heating, stir, make the cellulose acetate ester solution thus to dissolve each component.

The composition of cellulose acetate ester solution (%)	Internal layer	Outer
The composition of cellulose acetate ester solution (%)	Internal layer	Outer	Cellulose ethanoate, (particle size=20nm) postpones dose S-2-1 to degree of acetylation=60.9% triphenyl (plastifier) biphenyl diphenyl phosphoester (plastifier) methylene chloride (first solvent) methyl alcohol (second solvent) 1-butanols (the 3rd solvent) silicon dioxide	20.89 1.63 0.815 61.22 14.83 0.313 0.00 0.302	19.78 1.54 0.770 62.12 15.03 0.320 0.160 0.280

Use three layers of common casting mold that internal layer dope and the outer dope that obtains is poured on the tube of 0 ℃ of cooling.The film that will comprise the residual solvent of 70 weight % is peeled off from tube, be fixed to two edges of pin type stenter (pin tenter), 80 ℃ down dry simultaneously on direction of transfer the draw ratios with 110% transmit, after reaching 10% residual solvent levels further 110 ℃ of dryings.Under 140 ℃ further with film drying 30 minutes, with the thus obtained cellulose acetate film that residual solvent levels the is 0.3 weight % (skin: 3 μ m, internal layer: 74 μ m, skin: that comprises 3 μ m) as residuite S-2.Find that the film that obtains has the optical characteristics of Re=8nm and Rth=82nm.

[preparation is used for the coating liquid AL-1 of oriented layer]

Be prepared as follows composition,, filtrate using acted on the coating liquid AL-1 of oriented layer by having the polypropylene filter filtration that hole dimension is 30 μ m.Modified polyvinylalcohol is described among Japanese Laid-Open Patent Application " Tokkaihei " No.9-152509 as used herein.

The composition that is used for the coating liquid of oriented layer	(％)
	(％)	Modified polyvinylalcohol AL-1-1 water methanol Gultaraldehyde (crosslinking chemical) citric acid citric acid list ethyl ester citric acid diethyl ester citric acid triethyl ester	4.01 72.89 22.83 0.20 0.008 0.029 0.027 0.006

(preparation is used for the coating liquid LC-1 of optical anisotropic layer)

Be prepared as follows composition,, filtrate using acted on the coating liquid LC-1 of optical anisotropic layer by having the polypropylene filter filtration that hole dimension is 0.2 μ m.According to EP1388538 A1, the synthetic LC-1-1 of the method for describing in the 21st page.

The composition that is used for the coating liquid of optical anisotropic layer	(％)
	(％)	Rod shaped liquid crystal (Paliocolor LC 242, BASF Japan) Ciral agent (Paliocolor LC 756, BASF Japan) Photoepolymerizationinitiater initiater (LC-1-1) methyl ethyl ketone	26.66 3.10 1.24 69.00

(preparation is used for the coating liquid LC-2 of optical anisotropic layer)

Be prepared as follows composition,, filtrate using acted on the coating liquid LC-2 of optical anisotropic layer by having the polypropylene filter filtration that hole dimension is 0.2 μ m.According to being described in Angew.Makromol.Chem., vol.183, the p.45 synthetic LC-2-1 of the method in (1990).By the synthetic LC-2-2 of condensation 4-propyl group-cyclohexylphenol (Kanto Kagaku product) and 4-(the own oxygen base of the 6-acryloxy) benzoic acid that synthesizes by the method for describing among EP 1174411 B1.By condensation by synthetic 4-hydroxyl-4 '-(2-methyl butyl) biphenyl of the method for describing among WO 01/040154 A1 with by the synthetic LC-2-3 of synthetic 4-(the own oxygen base of the 6-acryloxy) benzoic acid of the method for describing among EP 1174411 B1.By being described in the synthetic LC-2-4 of method among EP 1389199 A1.Following synthetic LC-2-5, at first methylsulfonyl hydroxypropyl acrylate (Aldrich product) makes products obtained therefrom and 4-propyl cyclohexyl phenol (Kanto Kagaku product) reaction, adds sulfuretted hydrogen then.Following synthetic LC-2-6, trifluoromethanesulfonic acidization (triflating) 4-propyl cyclohexyl phenol (Kanto Kagaku product) utilizes phenylboric acid to make product stand the Suzuki coupling reaction, is translated into biphenol compound thus.Utilize isobutyryl chloride (isobutyric chloride) and aluminum chloride to 4 ' of the biphenyl that obtained-position acyl groupization, utilize the carbon atom of bromine bromination, utilize alkali to be translated into hydroxyl then at the carbonyl alpha-position.

The composition that is used for the coating liquid of optical anisotropic layer	(weight %)
	(weight %)	Rod shaped liquid crystal (LC-2-1) rod shaped liquid crystal (LC-2-2) chirality agent (LC-2-3) chirality agent (LC-2-4) chain-transferring agent (LC-2-5) Photoepolymerizationinitiater initiater (LC-2-6) methyl ethyl ketone	6.67 2.60 21.07 1.67 0.67 0.67 66.65

(preparation is used for the coating liquid LC-3 of optical anisotropic layer)

Be prepared as follows composition,, filtrate using acted on the coating liquid LC-3 of optical anisotropic layer by having the polypropylene filter filtration that hole dimension is 0.2 μ m.

The composition that is used for the coating liquid of optical anisotropic layer	(％)
	(％)	Rod shaped liquid crystal (Paliocolor LC 242, BASF Japan) chirality agent (Paliocolor LC 756, BASF Japan) Photoepolymerizationinitiater initiater (LC-1-1) methyl ethyl ketone	25.11 4.65 1.24 69.00

(preparation is used for the coating liquid LC-4 of optical anisotropic layer)

Be prepared as follows composition,, filtrate using acted on the coating liquid LC-4 of optical anisotropic layer by having the polypropylene filter filtration that hole dimension is 0.2 μ m.

The composition that is used for the coating liquid of optical anisotropic layer	(％)
	(％)	Rod shaped liquid crystal (Paliocolor LC 242, BASF Japan) chirality agent (Paliocolor LC 756, BASF Japan) Photoepolymerizationinitiater initiater (LC-1-1) methyl ethyl ketone	23.56 6.20 1.24 69.00

(polarization UV radiation equipment POLUV-1)

Is furnished with the D-bulb as UV radiation equipment (the Light Hammer 10 of spectrum in the UV light source display set by using based on microwave-analog transmissions system at 350-400nm, 240W/cm, Fusion UV system product), and by preparing polarization UV radiation equipment at distance radiating surface 10cm place placement tinsel-grid polarization filter (wire-grid polarizing filter) (ProFlux PPL02 (high transmission-type), Moxtek product).Find that it is 400mW/cm that this equipment has high-high brightness ²

(a side saponification of cellulose ester film)

Make cellulose ester film pass through 60 ℃ induction heating roller, the temperature that improves film surface thus utilizes excellent spreader will have the aqueous slkali of following formulation with 14ml/m to not being higher than 40 ℃ ²Amount be applied to the surface of film.Under steam type far infrared heater (Noritake Co., Ltd product), make film under 110 ℃ of heating, keep leaving standstill 10 seconds, utilize identical excellent spreader with 3ml/m ²Amount pure water is applied to the surface.This moment, film surface temperature was 40 ℃.Next, utilize water spray spreader water to clean, utilize air knife to remove water, triplicate keeps film to leave standstill 2 seconds with drying in 70 ℃ arid region.

Aqueous slkali is formed	(％)
Aqueous slkali is formed	(％)	Potassium hydroxide water isopropyl alcohol propylene glycol surfactant (SF-1)	4.7 14.7 64.8 14.8 1.0

C ₁₆H ₃₃O(CH ₂CH ₂O) ₁₀H (SF-1)

[embodiment 1-1]

A surface by an above-mentioned side method for saponification saponification residuite S-1, further utilize the coating of #14 metal thread bar spreader to be used for the coating liquid of oriented layer AL-1 thereon, following dry 60 seconds 60 ℃ of hot-airs, and then, form the thick oriented layer of 1.0 μ m thus 90 ℃ of hot-airs dry 150 seconds down.The oriented layer that forms thus in the friction of the direction of residuite slow axis, the coating liquid LC-1 that utilizes #8 metal thread bar spreader will be used for optical anisotropic layer thereon is applied to the surface of oriented layer, drying and slaking 2 minutes, keep 100 ℃ of film temperatures simultaneously, form optical anisotropic layer thus with even liquid crystal phase.After the slaking at once, with place have oxygen content be 0.3% or lower nitrogen atmosphere under optical anisotropic layer with using POLUV-1 (brightness=200mW/cm ², radiation energy=200mJ/cm ²) polarization UV optical radiation, simultaneously, at the axis of homology of residuite quick shaft direction orientation polaroid, thereby the fixed optics anisotropic band makes the optical compensating gage of embodiment 1-1 thus.Even the optical anisotropic layer after finding to fix does not at high temperature show liquid crystal phase yet.The thickness of optical anisotropic layer is 3.4 μ m.

[embodiment 1-2]

A surface by an above-mentioned side method for saponification saponification residuite S-2, further utilize #14 metal thread bar spreader on stromal surface, to apply the coating liquid that is used for oriented layer AL-1 thereon, following dry 60 seconds 60 ℃ of hot-airs, and then, form the thick oriented layer of 1.0 μ m thus 90 ℃ of hot-airs dry 150 seconds down.The oriented layer that forms thus in the friction of the direction of residuite slow axis, thereon, the coating liquid LC-1 that utilizes #4 metal thread bar spreader will be used for optical anisotropic layer is applied to the surface of oriented layer, drying and slaking 1 minute, keep 100 ℃ of film temperatures simultaneously, form optical anisotropic layer thus with even liquid crystal phase.After the slaking at once, with place have oxygen content be 0.3% or lower nitrogen atmosphere under optical anisotropic layer with using POLUV-1 (brightness=200mW/cm ², radiation energy=200mJ/cm ²) polarization UV optical radiation, simultaneously, at the axis of homology of residuite quick shaft direction orientation polaroid, thereby the fixed optics anisotropic band makes the optical compensating gage of embodiment 1-2 thus.Even the optical anisotropic layer after finding to fix does not at high temperature show liquid crystal phase yet.The thickness of optical anisotropic layer is 1.7 μ m.

[Comparative Examples 1-1]

A surface by an above-mentioned side method for saponification saponification residuite S-1, further utilize #14 metal thread bar spreader on stromal surface, to apply the coating liquid that is used for oriented layer AL-1 thereon, following dry 60 seconds 60 ℃ of hot-airs, and then, form the thick oriented layer of 1.0 μ m thus 90 ℃ of hot-airs dry 150 seconds down.The oriented layer that forms thus in the friction of the direction of residuite slow axis, thereon, the coating liquid LC-2 that utilizes #3 metal thread bar spreader will be used for optical anisotropic layer is applied to the surface of oriented layer, drying and slaking 1 minute, keep 60 ℃ of film temperatures simultaneously, form optical anisotropic layer thus with even liquid crystal phase.After the slaking at once, with place have oxygen content be 0.3% or lower nitrogen atmosphere under optical anisotropic layer with using POLUV-1 (brightness=200mW/cm ², radiation energy=200mJ/cm ²) polarization UV optical radiation, simultaneously, at the axis of homology of residuite quick shaft direction orientation polaroid, thereby the fixed optics anisotropic band makes the optical compensating gage of Comparative Examples 1-1 thus.Even the optical anisotropic layer after finding to fix does not at high temperature show liquid crystal phase yet.The thickness of optical anisotropic layer is 1.3 μ m.

(dry adhesive)

Whether separate by crosscut method visual observation, estimate by Three Estate as follows:

Zero: almost do not observe separation;

△: observe 10% or more the separation; With

*: observe 50% separation.

(wet adhesion)

The sample of 24 * 36mm be impregnated in 60 ℃ the hot water 5 minutes, whether visual observation separates, and estimates by Three Estate as follows:

Zero: almost do not observe separation;

△: observe 10% or more the separation; With

*: observe 50% separation.

(delay measurements)

Use KOBRA 21ADH (Oji Scientific Instruments product), measure and postpone Re in the front under 589 nm and when utilizing slow axis to make sample inclination ± 40 °, measure and postpone Re (40) and Re (40) as turning axle.The delay of optical anisotropic layer of the present invention is determined in the delay that deducts matrix by the delay from the whole optical compensating gage under all angles.

Embodiment 1-1, the cohesive evaluation result of 1-2 and Comparative Examples 1-1 is shown among the table 1-1, shows embodiment 1-1 in table 1-2, and the measurement of the optical anisotropic layer among 1-2 and the Comparative Examples 1-1 postpones.

Table 1-1

Sample	Do	Wet
Sample	Do	Wet	Embodiment 1-1 embodiment 1-2 Comparative Examples 1-1	○ ○ ×	○ ○ ×

Table 1-2

Sample	Re	Re(40)	Re(-40)
Sample	Re	Re(40)	Re(-40)	Embodiment 1-1 embodiment 1-2 Comparative Examples 1-1	23.6 11.7 6.8	61.6 30.8 53.5	60.4 30.6 53.0

(preparing polaroid) by optical compensating gage

Will be according to the embodiment 1-1 of first embodiment of the invention, each optical compensating gage of 1-2 and commercially available Fujitac TD80UF (Fuji Photo Film Co., Ltd., Re=3nm, being stacked on 55 ℃ and impregnated in the 1.5N sodium hydrate aqueous solution 2 minutes Rth=50nm).At room temperature in cleaning water-bath, clean sample, and 30 ℃ of sulfuric acid neutralizations with 0.1N.At room temperature in cleaning water-bath, clean sample again, with 100 ℃ hot-air dry.After cleaning again and neutralizing, utilize polyvinyl alcohol-based adhesives, the film of two saponification is bonded on two surfaces of polarization film, make the polaroid of one thus as the protective film of polaroid in roll-to-roll mode.Discovery all is being excellent aspect the throughput rate according to two embodiment of first embodiment of the invention, and the desirable surface appearance of display optical anisotropic band.The optical compensating gage of Comparative Examples is deficiency aspect cohesive not only, and produces following problem: before the coating oriented layer, reduce throughput rate in a side saponification, and pollute saponification and bathe during producing polaroid.

[embodiment 1-3]

(preparation VA-LCD equipment)

From commercially available VA-LCD equipment (SyncMaster 173P, SamsungElectronics Co., Ltd. product) peel off upper and lower polaroid, use contact adhesive, place polaroid commonly used at upside, place the polaroid of optical compensating gage at downside, thereby optical anisotropic layer makes LCD of the present invention thus in the face of the host glass of liquid crystal cells with embodiment 1-1.The cross sectional representation that shows the LCD make thus among Fig. 5, and with the angular relationship of the optical axis of each layer.In Fig. 5; label 41 is represented polarization layer; 42 represent residuite; 43 represent oriented layer; 44 represent optical anisotropic layer (41-44 has constituted optical compensating gage of the present invention), and 45 represent polarizer protection film, and 46 representatives are used for the glass matrix of liquid crystal cells; 47 represent liquid crystal cells, and 48 represent pressure sensitive adhesive layer.Arrow in polarization layer 41 is represented the direction of absorption axes, and the arrow in optical anisotropic layer 44 and protective film 45 is represented slow-axis direction, and circle represents to be arranged in the arrow of the normal direction on the mapping paper.

(estimating VA-LCD equipment)

Use visual angle surveying instrument (EZ Constract 160D, ELDIM product) to measure the viewing angle characteristic of the LCD that makes thus.Particularly at 45 ° of vergence direction visual observation display devices.The contrast-response characteristic that shows the embodiment 1-3 that measures by EZ Contrast among Fig. 6, the result of demonstration visual observation among the table 1-3.

Table 1-3

Sample	The result of visual observation
Sample	The result of visual observation	Embodiment 1-3	Little color error, desirable tone of gray characteristic

[embodiment 2-1]

A surface by an above-mentioned side method for saponification saponification residuite S-1, further utilize #14 metal thread bar spreader on stromal surface, to apply the coating liquid AL-1 that is used for oriented layer thereon, following dry 60 seconds 60 ℃ of hot-airs, and then, form the thick oriented layer of 1.0 μ m thus 90 ℃ of hot-airs dry 150 seconds down.The oriented layer that forms thus in the friction of the direction of residuite slow axis, the coating liquid LC-3 that utilizes #8 metal thread bar spreader will be used for optical anisotropic layer is applied to the surface of oriented layer, drying and slaking 2 minutes, keep 100 ℃ of film temperatures simultaneously, form optical anisotropic layer thus with even liquid crystal phase.After the slaking at once, with place have oxygen content be 0.3% or lower nitrogen atmosphere under optical anisotropic layer with using POLUV-1 (brightness=200mW/cm ², radiation energy=200mJ/cm ²) polarization UV optical radiation, simultaneously, at the axis of homology of residuite quick shaft direction orientation polaroid, thereby the fixed optics anisotropic band makes the optical compensating gage of embodiment 2-1 thus.Even the optical anisotropic layer after finding to fix does not at high temperature show liquid crystal phase yet.The thickness of optical anisotropic layer is 3.4 μ m.

[embodiment 2-2]

With with embodiment 2-1 in the similar mode of description prepare the optical compensating gage of embodiment 2-2, the coating liquid LC-4 that just will be used for optical anisotropic layer replaces being used for the coating liquid LC-3 of optical anisotropic layer.

[Comparative Examples 2-1]

With with embodiment 2-1 in the similar mode of description prepare the optical compensating gage of Comparative Examples 2-1, the coating liquid LC-1 that just will be used for optical anisotropic layer replaces being used for the coating liquid LC-3 of optical anisotropic layer.

[embodiment 2-3]

With with embodiment 2-1 in the similar mode of description prepare the optical compensating gage of Comparative Examples 2-3, the excellent measuring device (bar gauge) that just will be used to apply the metal thread bar spreader of the coating liquid LC-3 that is used for optical anisotropic layer changes #4 into, and removes the wire mesh grid polarization filter (wire grid polarizing filter) of POLUV-1.The thickness of finding optical anisotropic layer is 1.7 μ m.

[embodiment 2-4]

With with embodiment 2-2 in the similar mode of description prepare the optical compensating gage of Comparative Examples 2-4, the excellent measuring device that just will be used to apply the metal thread bar spreader of the coating liquid LC-4 that is used for optical anisotropic layer changes #4 into, and removes the wire mesh grid polarization filter of POLUV-1.The thickness of finding optical anisotropic layer is 1.7 μ m.

[Comparative Examples 2-2]

With with Comparative Examples 2-1 in the similar mode of description prepare the optical compensating gage of Comparative Examples 2-2, the excellent measuring device that just will be used to apply the metal thread bar spreader of the coating liquid LC-1 that is used for optical anisotropic layer changes #4 into, and removes the wire mesh grid polarization filter of POLUV-1.The thickness of finding optical anisotropic layer is 1.7 μ m.

(measure and postpone)

Use KOBRA 21 ADH (Oji Scientific Instruments product), measure front under 589nm and postpone Re and utilizing slow axis to make sample inclination ± 40 °, measure and postpone Re (40) and Re (40) as turning axle.

(measuring courage steroid spacing)

Use cross section TEM (transmission electron microscope) to measure courage steroid spacing.

The delay of embodiment 2-1 to 2-4 and Comparative Examples 2-1 and 2-2 and the measurement result of courage steroid spacing have been shown among the table 2-1.

Table 2-1

Sample	Re	Re(40)	Re(-40)	Courage steroid spacing
Sample	Re	Re(40)	Re(-40)	Courage steroid spacing	Embodiment 2-1 embodiment 2-2 embodiment 2-3 embodiment 2-4 Comparative Examples 2-1 Comparative Examples 2-2	21.7 18.3 3.2 2.9 31.1 3.1	72.3 68.1 42.9 41.3 83.5 40.2	70.0 66.2 40.3 38.9 81.2 39.5	91nm 63nm 92nm 61nm 141nm 143nm

(preparing polaroid) by optical compensating gage

Will be according to embodiment 2-1 to 2-4 and the optical compensating gage of Comparative Examples 2-1 and 2-2 and commercially available Fujitac TD80UF (the Fuji Photo Film Co. of second embodiment of the invention, Ltd., Re=3nm, Rth=50nm) in 55 ℃ of sodium hydrate aqueous solutions that impregnated in 1.5mol/l 2 minutes.At room temperature in cleaning water-bath, clean sample, and 30 ℃ of sulfuric acid neutralizations with 0.05mol/l.At room temperature in cleaning water-bath, clean sample again, and with 100 ℃ hot-air dry.After cleaning again and neutralizing, utilize polyvinyl alcohol-based adhesives, the film of two saponification is bonded on two surfaces of polarization film, make incorporate polaroid thus as the protective film of polaroid in roll-to-roll mode.Discovery all is being excellent aspect the throughput rate according to all embodiment of second embodiment of the invention, and the desirable surface appearance of display optical anisotropic band.

[embodiment 2-5]

(preparation VA-LCD equipment)

From commercially available VA-LCD equipment (SyncMaster 173P, SamsungElectronics Co., Ltd. product) peel off upper and lower polaroid, use contact adhesive, place polaroid commonly used at upside, place the polaroid of optical compensating gage at downside, thereby optical anisotropic layer makes LCD of the present invention thus in the face of the host glass of liquid crystal cells with embodiment 2-1.The cross sectional representation that shows the LCD make thus among Fig. 7 A, and with the angular relationship of the optical axis of each layer.In Fig. 7 A; label 41 is represented polarization layer; 42 represent residuite; 43 represent oriented layer; 44 represent optical anisotropic layer (41-44 has constituted optical compensating gage of the present invention), and 45 represent polarizer protection film, and 46 representatives are used for the glass matrix of liquid crystal cells; 47 represent liquid crystal cells, and 48 represent pressure sensitive adhesive layer.Arrow in polarization layer 41 is represented the direction of absorption axes, and the arrow in optical anisotropic layer 44 and protective film 45 is represented slow-axis direction, and circle represents to be arranged in the arrow of the normal direction on the mapping paper.

[embodiment 2-6]

With with embodiment 2-5 in the similar mode of description prepare the LCD of embodiment 2-6, the polaroid that only is to use the optical compensating gage with embodiment of the invention 2-2 is as the following polaroid among the embodiment 2-5.

[Comparative Examples 2-3]

With with embodiment 2-5 in the similar mode of description prepare the LCD of Comparative Examples 2-3, the polaroid that only is to use the optical compensating gage with Comparative Examples 2-1 of the present invention is as the following polaroid among the embodiment 2-5.

[embodiment 2-7]

(preparation VA-LCD equipment)

From commercially available VA-LCD equipment (SyncMaster 173P, SamsungElectronics Co., Ltd. product) peel off upper and lower polaroid, use contact adhesive, at the bonding polaroid of downside with optical compensating gage of embodiment of the invention 2-3, thereby optical anisotropic layer is in the face of the host glass of liquid crystal cells, use contact adhesive, at the bonding optical compensating gage of forming by the Arton of commercially available uniaxial tension of upside (Re=140nm), thereby the Arton of uniaxial tension makes LCD of the present invention thus in the face of the host glass of liquid crystal cells.The cross sectional representation that shows the LCD make thus among Fig. 7 B, and the angular relationship of the optical axis of each layer, wherein, those with Fig. 7 A in identical layer have with Fig. 7 A in identical label.In addition, the implication of the arrow shown in the layer also is identical.In Fig. 7 B, label 51 is represented the optical compensating gage of uniaxial tension.

[embodiment 2-8]

With with embodiment 2-7 in the similar mode of description prepare the LCD of embodiment 2-8, the polaroid that only is to use the optical compensating gage with embodiment of the invention 2-4 is as the following polaroid among the embodiment 2-7.

[Comparative Examples 2-4]

With with embodiment 2-7 in the similar mode of description prepare the LCD of Comparative Examples 2-4, the polaroid that only is to use the optical compensating gage with Comparative Examples 2-2 of the present invention is as the following polaroid among the embodiment 2-7.

(estimating VA-LCD equipment)

Use visual angle surveying instrument (EZ Constract 160D, ELDIM product) to measure the viewing angle characteristic of the LCD that makes thus.Particularly at 45 ° of vergence direction visual observation displays.The contrast-response characteristic that shows the embodiment 2-5 that passes through EZ Contrast measurement among Fig. 8 shows by the embodiment 2-5 to 2-8 of EZ Contrast measurement and the contrast value of Comparative Examples 2-1 and 2-2 among the table 2-2.

Table 2-2

Sample	Positive contrast
Sample	Positive contrast	Embodiment 2-5 embodiment 2-6 Comparative Examples 2-3 embodiment 2-7 embodiment 2-8 Comparative Examples 2-4	706 695 623 734 732 665

Industrial applicibility

Use optical compensating gage of the present invention can be under the normal arrangement that does not significantly change LCD the optical compensation liquid crystal cells, and use the LCD of the present invention of described optical compensating gage can improve display quality and viewing angle characteristic significantly.

Particularly, the optical compensating gage of first embodiment of the invention be presented at oriented layer and the optical anisotropic layer that forms by liquid-crystal composition between the level of adhesion of excellence, therefore, no longer need optical anisotropic layer is transferred on the residuite, this is different from traditional optical compensating gage, and separates with layer wash-out and can avoid at the layer in saponification is bathed during the saponification of handling polaroid.The optical compensating gage that can also prepare the throughput rate excellence.

The LCD that comprises the optical compensating gage of second embodiment of the present invention is being improved aspect positive contrast and the viewing angle characteristic significantly.

Cross reference

35 USC 119 times, the application requires at the Japanese patent application Nos.2004-378943 of application on Dec 28th, 2004 with in the right of priority of the Japanese patent application 2005-028806 of application on February 4th, 2005.

Claims

1. optical compensating gage, it comprises:

Residuite;

Polymeric layer, it comprises the solution of polymerizable compound and the solvent compositions with 20 weight % or more water by coating and drying and forms on described residuite; With

Optical anisotropic layer, it is by solidifying down the liquid crystal layer that comprises at least a liquid-crystal compounds and form on the surface at described polymeric layer being 70-160 ℃ at film surface temperature under the irradiation of ionizing radiation;

2. optical compensating gage as claimed in claim 1, wherein, described liquid-crystal compounds is the polymeric liquid crystal compound with at least one reactive group, and described optical anisotropic layer is the layer that forms of hardening bath crystal layer thus by the reaction of carrying out described reactive group under the heating and/or the irradiation of ionizing radiation.

3. optical compensating gage as claimed in claim 1 or 2, wherein, when shining by ionizing radiation, the film surface temperature of described liquid crystal layer is than the glass transition temperature height of described polymerizable compound.

4. optical compensating gage as claimed in claim 3, wherein, when shining by ionizing radiation, the film surface temperature of described liquid crystal layer is than the high 1-30 of glass transition temperature ℃ of described polymerizable compound.

5. as each described optical compensating gage of claim 1-4, wherein, described solution comprises at least a polymerizable compound that has polymerizable groups on its side chain.

6. as each described optical compensating gage of claim 1-5, wherein, described liquid-crystal compounds shows cholesteryl liquid crystal.

7. as each described optical compensating gage of claim 1-6, wherein, described liquid-crystal compounds is to have the polymeric liquid crystal compound of at least one ethylenic unsaturated group and described optical anisotropic layer is to solidify the layer that described liquid crystal layer forms thus by carry out the reaction of ethylenic unsaturated group under the polarized ultraviolet irradiation.

8. optical compensating gage, it comprises optical anisotropic layer, and described optical anisotropic layer is formed by cholesteric liquid crystal compositions, and it has 500nm or more as many as 5 μ m or thickness still less and 120nm or littler courage steroid spacing,

9. optical compensating gage, it comprises:

Residuite;

Be formed at the polymeric layer on the described residuite, lip-deep optical anisotropic layer at described polymeric layer, described optical anisotropic layer is formed by the cholesteric liquid crystal compositions of polymerization, and it has 500nm or more as many as 5 μ m or thickness still less and 120nm or littler courage steroid spacing

10. optical compensating gage, it comprises:

Residuite;

Be formed at the polymeric layer on the described residuite, lip-deep optical anisotropic layer at described polymeric layer, described optical anisotropic layer is formed by the liquid-crystal composition of polymerization, and it has 500nm or more as many as 5 μ m or thickness still less and 120nm or littler courage steroid spacing

11. as each described optical compensating gage of claim 8-10, wherein, the courage steroid spacing of described optical anisotropic layer is 100nm or littler.

12. as each described optical compensating gage of claim 8-11, wherein, described optical anisotropic layer is by carrying out being solidified to form of described composition under the irradiation of polarized ultraviolet.

13. as each described optical compensating gage of claim 8-12, it is 0-70nm that its front that has postpones, and utilizing in the face slow axis as sloping shaft (turning axle), is the delay that the light from respect to the direction of+40 ° of the normal direction rotations of layer plane of λ nm has 30-150nm for wavelength.

14. as each described optical compensating gage of claim 1-13, wherein, described residuite comprises at least a polymkeric substance that is selected from cellulose-based polymer and cycloalkenyl group polymkeric substance.

15. as each described optical compensating gage of claim 1-14, it is used for the optical compensation of liquid crystal cells, described liquid crystal cells comprises a pair of matrix that is disposed opposite to each other and remains in the liquid crystal layer that comprises liquid crystal material between the described a pair of matrix that the liquid crystal molecule of described liquid crystal material and the surface of described a pair of matrix substantially perpendicularly are orientated.

16. comprise polarization film and at least one polaroid as each described optical compensating gage of claim 1-15.

17. comprise at least one polaroid as claimed in claim 17 or at least one LCD as each described optical compensating gage of claim 1-15.

18. LCD as claimed in claim 17, it adopts the VA-pattern.

19. the preparation method of optical compensating gage, it comprises:

Comprise the lip-deep liquid crystal layer of the described polymeric layer of placing of at least a liquid-crystal compounds by irradiation and form optical anisotropic layer, wherein, film surface temperature be 70-160 ℃ down with ionizing radiation making it curing,