CN103135157B - Method for preparing composite phase difference board - Google Patents
Method for preparing composite phase difference board Download PDFInfo
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- CN103135157B CN103135157B CN201110408274.0A CN201110408274A CN103135157B CN 103135157 B CN103135157 B CN 103135157B CN 201110408274 A CN201110408274 A CN 201110408274A CN 103135157 B CN103135157 B CN 103135157B
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Abstract
A method for preparing a composite phase difference board comprises that a first support board is offered and an optical alignment film is formed on the surface of the first support board. A first liquid crystal coating material is further coated on a first surface of the optical alignment film so that the first liquid crystal coating material is solidified and a first phase difference board is formed. A first surface of the first phase difference board is adhered to a second support board. The optical alignment film is separated from the first support board so that a second surface of the optical alignment film is exposed. Finally, a second liquid crystal coating material is coated on the second surface of the optical alignment film so that the second liquid crystal coating material is solidified and a second phase difference board is formed. Therefore, the two phase difference boards can be obtained through only one optical alignment film, the number of the used optical alignment films can be effectively reduced, technology cost is low and the thin type composite phase difference board can be obtained.
Description
Technical field
The present invention has about a kind of with the method for light orientation legal system for phase difference board, particularly a kind of with the method for light orientation legal system for composite phase difference board.
Background technology
Known liquid crystal molecule has different refractive indexes on axially different, this birefringence had for liquid crystal molecule (birefringence), make light when irradiating by liquid crystal molecule, light polar biased direction is changed concurrent third contact of a total solar or lunar eclipse delay phenomenon (optical retardation) and produces phasic difference, and this is the optics anisotropy (opticalanisotropic) of liquid crystal molecule.Because the optics anisotropy of liquid crystal can change light polarization direction, therefore in order to regulate and control light penetration, the chiaroscuro effect in display can be reached, and then be applied on display; On the other hand, also due to the optical delay phenomenon that this optics anisotropy causes, liquid crystal molecule rete can be applied as phase difference board (opticalretarder).According to required phasic difference value, phase difference board can be arranged in pairs or groups in liquid crystal display during application, reduce the light leak of liquid crystal display and promote display comparison, reaching the effect of wide viewing angle.
No matter be applied in display or phase difference board, liquid crystal molecule all just can must be effectively utilised via orientation (aligned).The orientation of liquid crystal is through the very low power structure (microgroove structure) at formed the on the surface a kind of tool specific direction of alignment film the earliest, make to be configured at the liquid crystal molecule on alignment film and carry out orthodromic's arrangement according to this specific direction (being alignment direction) of very low power structure, and then obtain the effect of orientation.
The manufacture of this kind of alignment film, known technology be mostly adopt contact brushing method (rubbing) alignment film on the surface brushing go out the very low power structure of a lot of, but brushing method is not also suitable for large-area orientation, and it cannot be issued to enough yields in the requirement that display is in large size; And in the middle of brushing process, be easy to alignment film surface produce the problem such as fine particle, fiber contamination or electrostatic and (see US6649231, and then have influence on the orientation effect that liquid crystal molecule arranges thereon.On the other hand, the orientation carrying out multizone on an alignment film also not easily reaches through brushing method, it need through the brushing technique of multiple tracks, and have that product yield is not high, alignment film is surperficial easily occurs the problem such as defect and particle contamination, the method cannot be utilized to meet display with multizone orientation to reach the demand of wide viewing angle performance.
For overcoming the shortcoming of aforementioned brushing method technique, namely contactless alignment method arises at the historic moment.Just a kind of light alignment method is mentioned in US Patent No. 5389698, it irradiates for photocrosslinking type light orientation resin with linear polarization ultraviolet light, make this type of molecular resin because being subject to the impact of linear polar biased ultraviolet light, and carry out orthodromic's arrangement along required preset direction, after fixing via cross-linking reaction afterwards, a smooth alignment film can be formed.The mode of this kind of light alignment film alignment liquid crystal is through linear polar biased UV-irradiation, make light alignment film on the surface the Fan get Wa Li of molecular resin be able to distribute along this preset direction, and and then order about liquid crystal molecule according to this preset direction (being alignment direction) and carry out orthodromic's arrangement (M.Schadt, JJAP, 1992, obtain the effect of orientation eventually.The aforementioned Fan get Wa Li distributed along this preset direction is the specific direction distribution led because connecing structure in the functional group of light alignment film surface molecular or side chain, makes the electron cloud on light alignment film surface or dipole distribution have directivity.
The advantage of light alignment method does not need to rub or the surface of contact alignment film, liquid crystal molecule can be induced to have orthodromic's arrangement of a specific direction, solve particle and electrostatic problem that traditional brushing method produces.On the other hand, light orientation method can be applied on the substrate surface of deflection or tool arc, can overcome the restriction that known contact method need use hard and flat substrate, therefore be applicable to the continuous processing of roll to roll, produce in a large number.In addition, light alignment method also can be applicable to form a both alignment layers again on the liquid crystal coatings of orientation, and carry out the orientation of different directions, and the face of lower floor's alignment liquid crystal rete can not be damage, use to be formed and there is multiple alignment film in different alignment direction and the composite phase difference board of liquid crystal coatings, and the alignment direction of light orientation method can set arbitrarily, and this to be known brushing method be difficult to accomplish.
For coordinating dissimilar liquid crystal display to the demand of phasic difference value, knownly utilize aforementioned smooth orientation method that the alignment film in multiple different alignment direction and liquid crystal coatings storehouse are formed dissimilar composite phase difference board, in order to reduce the light leak defect of liquid crystal display.For example, the liquid crystal display of vertical orientation (vertical alignment), need the composite phase difference board of an eurymeric A plate and minus C plate collocation to compensate required phasic difference value, liquid crystal display just can be made to reach preferably to when effect of wide angle; Or cholesterol liquid crystal used needs the composite phase difference board of an eurymeric A plate and eurymeric C plate collocation to promote it and contrast and to improve the problem of colour cast in brightness enhancement film (brightenhancement film).
Application like this is all use two-layer phase difference board, and in making, the known practice must use at least two-layer alignment film, has identical or different alignment direction to make the liquid crystal coatings as phase difference board.Namely refer to one in US Patent No. 6717644 and comprise the two-layer composite phase difference board with difference in functionality (different alignment direction or different phasic difference values), it use two-layer alignment film in order to the two-layer liquid crystal molecule of difference orientation.But the material cost of known alignment film is quite expensive, the use of this two-layer alignment film just can make the cost of composite phase difference board greatly increase, and also can increase the thickness of phase difference board, is unfavorable for the demand of display slimming.
Therefore, develop a kind of lower-cost composite phase difference board manufacture method, have its needs.
Summary of the invention
Fundamental purpose of the present invention is to provide a kind of method preparing composite phase difference board.
The method preparing composite phase difference board disclosed by the present invention, comprises the following step: (a) provides one first back up pad; B () is coated with a smooth orientation resin in the upper surface of this first back up pad, and with one first this light orientation resin of linear polar biased UV-irradiation, make it carry out light orientation reaction (photo-alignment), to form a smooth alignment film; C () in the first surface coating one first liquid crystal coating material of this light alignment film, and with this first liquid crystal coating material of one first non-linear polar biased UV-irradiation, makes it solidify to form one first phase difference board; D the first surface of this first phase difference board sticks on one second back up pad by (), then make this light alignment film and this first back up pad peel off, expose to the open air to make the second surface of this light alignment film; And (e) is coated with one second liquid crystal coating material on the second surface of this light alignment film, with this second liquid crystal coating material of one second non-linear polar biased UV-irradiation, makes it solidify and use formation one second phase difference plate.
Preparation method pointed by the present invention, only needs to use single smooth alignment film, can obtain two phase difference board, therefore effectively can reduce the use amount of alignment film, therefore have cheaper process costs, and can obtain the composite phase difference board of slimming.
In addition, preparation method of the present invention, in response to by light orientation method, therefore also synchronously can solve known brushing legal system for compositeness phase difference board, produce the problem of particle and electrostatic in alignment film on the surface.
According to another object of the present invention, be to provide a kind of through the composite phase difference board prepared by preceding method, because it more known composite phase difference board can use one deck alignment film less, so its thickness can be reduced further, reach effect of slimming.
Accompanying drawing explanation
Fig. 1 is the schematic diagram that light orientation molecular resin carries out light orientation reaction.
Fig. 2 is the schematic diagram of the smooth alignment film of formation one.
Fig. 3 is the schematic diagram of formation one first phase difference board.
Fig. 4 is the schematic diagram the first phase difference board being sticked in the second back up pad and light alignment film and the first back up pad are peeled off.
Fig. 5 is the schematic diagram of formation one second phase difference plate.
Fig. 6 differs from the second linear polar biased UV-irradiation in the first linear polar biased ultraviolet light polar biased direction in the schematic diagram of the second surface of light alignment film with one.
[primary clustering symbol description]
13: light orientation molecular resin
16: the first linear polar biased ultraviolet lights
161: preset polar biased direction
22: the first back up pads
221: upper surface
23: light orientation resin
24: light alignment film
241: first surface
242: second surface
33: the first liquid crystal coating materials
34: the first phase difference board
341: first surface
36: the first non-linear polar biased ultraviolet lights
42: the second back up pads
50: composite phase difference board
53: the second liquid crystal coating materials
54: second phase difference plate
56: the second non-linear polar biased ultraviolet lights
66: the second linear polar biased ultraviolet lights
661: preset polar biased direction
Embodiment
In order to achieve the above object, namely the present invention proposes a kind of preparation method of composite phase difference board, effectively can solve the higher problem of aforementioned known techniques cost.
Be convenient to for making the those skilled in the art haveing the knack of field of the present invention understand disclosed technology, below coordinate and consult Fig. 1 to Fig. 6, example illustrates that the present invention prepares the method for composite phase difference board.
Consult Fig. 2, comprise the following step according to disclosed method:
First, one first back up pad 22 is provided.
Then, the upper surface 221 in this first back up pad 22 is coated with a smooth orientation resin 23, and irradiates this light orientation resin 23 with one first linear polar biased ultraviolet light 16, makes it carry out light orientation reaction, to form a smooth alignment film 24.
Known, can there is photochemical reaction in light orientation resin after illumination is penetrated, and according to the photochemical reaction of occurred different mechanisms, can be roughly divided into: photo-isomerisable type, photocrosslinking type, and photo-cleavage type three types.The light orientation resin that can be applicable in the present invention is not particularly limited, and is preferably photocrosslinking type light orientation resin.
Consult Fig. 1, for photocrosslinking type light orientation resin, after it irradiates via linear polar biased ultraviolet light (polarizedultraviolet), this type light orientation molecular resin 13 can carry out cross-linking reaction.In cross-linking process, the impact of overall light orientation molecular resin 13 meeting because being subject to the first linear polar biased ultraviolet light 16, carry out orthodromic's arrangement along required default polar biased direction 161, and fix via cross-linking reaction, this process is light orientation reaction.
Light orientation resin 23 refers to the resin having and can carry out photochemically reactive functional group, can be applicable to the functional group of the light orientation resin 23 in the present invention, comprise but be not limited only to, be selected from the group that cinnamic acid ester group (cinnamate), cumarin ester group (coumarin), styryl phenyl ketone group (Chalcone), dimaleoyl imino (maleimide), quinoline ketone group (quinolinone) and two benzylidene bis (benzylidene) form, one of them plants functional group.
Known, linear polar biased ultraviolet light refers to it is the planar light with single linear polar biased direction, through screening out the polar biased light in other direction with general nonlinearity polar biased ultraviolet light (non-polarized ultraviolet), only leave the polar biased light in required single linear direction and obtain, light polarizing film or grating generally can be utilized to sieve linear polar biased ultraviolet light.And non-linear polar biased ultraviolet light is the light that general light source comes out, be also called round polar biased light, it, in the first-class intensity distributions of all directions, carries out omnirange irradiation.
Aforementioned first linear polar biased ultraviolet light 16 irradiates the dosage of light orientation resin, and skilled persons will on demand, such as: the device category of use, the kind etc. of light orientation resin, can select the exposure dose be applicable to.Known, photocrosslinking type light orientation resin only need be not less than 5mJ/cm with exposure dose
2linear polar biased UV-irradiation, can carry out light orientation reaction, therefore for making the light orientation resin be applied in the present invention can carry out light orientation reaction smoothly, the dosage of irradiation is preferably and is not less than 5mJ/cm
2.
The aforementioned upper surface 221 in the first back up pad 22 is coated with the mode of lighting orientation resin 23, and there is no particular restriction, implementer can consider that the convenience implemented is selected, comprise but be not limited only to, rotary coating (spin coating), line rod coating (bar coating), dipping formula coating (dip coating), slit coating (slot coating), or volume to volume is coated with coating methods such as (roll to roll coating).
The coating thickness that can be applicable to the light orientation resin 23 in the present invention is not particularly limited, and it does not affect the function of liquid crystal alignment, for ease of the consideration on operational convenience and cost, being better with 10nm ~ 1 μm, is better with 10nm ~ 50hm again.
In addition, after the upper surface 221 of this first back up pad 22 is coated with this light orientation resin 23, drying can be carried out to this light orientation resin further, by light orientation resin comprise the solvent removing of auxiliary coating, keep painting layer surface drying to be beneficial to follow-up processing process or preservation.Such as, can through heating plate drying, oven drying or vacuum drying etc., any method that other can apply known by skilled persons will, the convenience all can implemented because of it is selected, and is not particularly limited in the present invention.
Consult Fig. 3, on the first surface 241 of this light alignment film 24, be coated with one first liquid crystal coating material 33, and irradiate this first liquid crystal coating material 33 with one first non-linear polar biased ultraviolet light 36, make it solidify to form one first phase difference board 34.
According to the first liquid crystal coating material 33 described in the present invention, when it is coated on the first surface 241 of light alignment film 24, the effect of light alignment film surface molecular Fan get Wa Li can be subject to, and then the liquid crystal molecule ordered about on light alignment film 24 in first liquid crystal coating material 33 carries out orthodromic's arrangement according to this preset direction (being alignment direction), thus liquid crystal molecule obtains the effect of orientation.
Aforementioned first liquid crystal coating material 33 can carry out photochemically reactive acryl functional group because it has, and therefore the unsaturated double-bond in acryl functional group can be made to be cross-linked to each other after the first non-linear polar biased ultraviolet light 36 irradiates and solidify to form liquid crystal molecule rete.Again, because liquid crystal molecule has different refractive indexes (being referred to as birefringence) on axially different, when making light by liquid crystal molecule, the polar biased direction of light is changed concurrent third contact of a total solar or lunar eclipse delay phenomenon (optical retardation), thus produces phasic difference.Known, through the liquid crystal molecule rete of orientation, because its liquid crystal molecule has specific direction orthodromic arrangement, therefore there is homogeneous birefringence (birefringence), therefore can be employed as phase difference board (optical retarder).The required phasic difference value of phase difference board can be calculated through following equation (a):
Ro＝Δn·d (a)
Wherein, Ro is phasic difference value; Δ n is axially different refractive index difference, i.e. complex index of refraction; D is liquid crystal molecule thicknesses of layers.Δ n its be belong to the physical property that liquid crystal material itself has, different liquid crystal materials has different Δ n values; Liquid crystal molecule thicknesses of layers then can be regulated and controled through coating method and parameter, to reach different phasic difference values.
There is no particular restriction to can be applicable to the coating method of the first liquid crystal coating material 33 in the present invention, implementer can consider that the convenience implemented is selected, comprise but be not limited only to, rotary coating (spin coating), line rod coating (bar coating), dipping formula coating (dip coating), slit coating (slot coating), or volume to volume is coated with coating methods such as (roll to roll coating).Further, further through the mode such as line bar gauge lattice or winding rotary speed of rotating speed, use, the coating thickness of liquid crystal molecule rete can be regulated and controled.
Can be applicable to the first liquid crystal coating material 33 in the present invention, comprise but be not limited only to, there is the photocrosslinking type liquid crystal material of acryl functional group.
In addition, be coated with the first liquid crystal coating material 33 on the first surface 241 of light alignment film 24 after, drying can be carried out further to this first liquid crystal coating material 33, by in the first liquid crystal coating material comprise the solvent removing of auxiliary coating, keep painting layer surface drying to be beneficial to follow-up processing process or preservation.Such as, can through heating plate drying, oven drying or vacuum drying etc., any method that other can apply known by skilled persons will, the convenience all can implemented because of it is selected.
The irradiation energy of aforementioned first non-linear polar biased ultraviolet light 36, implementer according to the kind of used liquid crystal coating material, the device category that uses, can select suitable exposure dose.Because liquid crystal coating material used in the present invention comprises photocrosslinking type liquid crystal material, for making its curable formation liquid crystal molecule rete, can be applicable to the energy of the first non-linear polar biased UV-irradiation in the present invention, with 20 ~ 1000mJ/cm
2for better, again with 170 ~ 500mJ/cm
2for better.
Wherein, the irradiation energy of this first non-linear polar biased ultraviolet light 36, only in order to be solidified under the state with preset direction orthodromic arrangement by liquid crystal coating material.But the exposure dose that known technology uses is about 1500 ~ 5000mJ/cm
2much larger than the applicable scope of the present invention, these energy can penetrate liquid crystal molecule rete, damage the electron cloud on light alignment film surface or dipole distribution, make light alignment film surface molecular lose regiospecific, therefore cannot order about Liquid Crystal Molecules Alignment further again.But, even if light alignment film loses the function of ordering about Liquid Crystal Molecules Alignment, do not affect the orientation result of the liquid crystal molecule rete of solidified forming, this is namely known to the high irradiation energy solidification of non-linear polar biased ultraviolet light, single phase difference board can be formed and still do not affect the performance of its optical property, and the main cause that the two sides regiospecific of known smooth alignment film cannot be utilized.
Consult Fig. 4, the first surface 341 of the first phase difference board 34 is sticked on one second back up pad 42.
The first surface 341 of aforementioned first phase difference board 34 sticks in, and the second back up pad 42 pastes method, is not particularly limited.Such as, pasted through bestowing the adhesive agent such as a pressure-sensing glue or UV glue between the first phase difference board 34 and the second back up pad 42, or a tackness surface treatment etc. is done in the second back up pad 42, skilled persons will also can select other can make the method for binding both this, and range of application of the present invention is not limited to this measure.
Then, this light alignment film 24 is peeled off with this first back up pad 22, exposes to the open air to make the second surface 242 of this light alignment film 24.
Be easier to for making stripping program implement, the upper surface 221 of this first back up pad 22 optionally can bestow the surface treatment of the release effect of an enhancement in advance.The surface treatment method promoting release effect is not particularly limited, at the example that this can enumerate, comprise but be not limited only to, paste the resin bed etc. that release film or coating have release effect, any method that other can apply known by skilled persons will all can be employed, and range of application of the present invention is not limited to this measure.
The material that can be applicable to the first back up pad 22 in the present invention and the second back up pad 42 can be respectively, and comprises but is not limited only to, glass, Triafol T resin (Triacetyl Cellulose), polyester based resin (polyester-based resin), acetic acid system resin (acetate-based resin), polyethersulfone system resin (polyethersulfone-based resin), polycarbonate-based resin (polycarbonate-based resin), polyamide series resin (polyamide-based resin), polyimide system resin (polyimide-based resin), polyolefin-based resins (polyolefin-based resin), acrylic ester resin (acrylic-based resin), polyvinyl chloride resin (polyvinyl chloride-based resin), polystyrene resin (polystyrene-based resin), polyvinyl alcohol resin (polyvinyl alcohol-based resin), polyarylate system resin (polyarylate-based resin), polyphenylene sulfide system resin (polyphenylene sulfide-based resin), the sub-vinylite (polyvinylidenechloride-based resin) of poly-dichloro or methacrylate ester resin ((methyl) acrylic-based resin).The material of the first back up pad and the second back up pad can be selected according to user demand respectively, and both can be identical or different.
In order to operational convenience, and save the consideration such as material, process costs, when disclosed composite phase difference board makes, can directly put in its optical film combination intending application.Therefore, can be applicable to the kind of the second back up pad 42 in the present invention, comprise but be not limited only to, release film, Polarizer, diaphragm, diffusion barrier, diffuser plate, light guide plate, brightness enhancement film, flexible panel extends roller or contact panel.
Consult Fig. 5, one second liquid crystal coating material 53 is coated with on the second surface 242 of this light alignment film 24, this the second liquid crystal coating material 53 is irradiated again with one second non-linear polar biased ultraviolet light 56, photochemically reactive acryl functional group can be carried out because it has, the unsaturated double-bond in acryl functional group can be made to be cross-linked to each other after the second non-linear polar biased ultraviolet light 56 irradiates and solidify to form liquid crystal molecule rete, can be employed as phase difference board, be second phase difference plate 54.
According to the second liquid crystal coating material 53 described in the present invention, when it is coated on the second surface 242 of light alignment film 24, arrangement can be ordered about by light alignment film surface molecular and the orthodromic with preset direction arranges.
Can be applicable to the second liquid crystal coating material 53 in the present invention, comprise but be not limited only to, there is the photocrosslinking type liquid crystal material of acryl functional group.
The irradiation energy of aforementioned second non-linear polar biased ultraviolet light 56, implementer can according to the kind of used liquid crystal coating material, the device category that uses, select suitable exposure dose, as long as liquid crystal coating material can be made to reach solidification object person, all can be applied in the present invention, be not particularly limited.In addition, because liquid crystal coating material 53 used in the present invention comprises photocrosslinking type liquid crystal material, for making its curable formation liquid crystal molecule rete, can be applicable to the energy of the second non-linear polar biased UV-irradiation in the present invention, to be not less than 20mJ/cm
2for good.
In addition, because light alignment film 24 has not needed to do further utilization more, even if therefore light alignment film is subject to the energy exposure of the second too high non-linear polar biased ultraviolet light 56, thus loses the function of induction Liquid Crystal Molecules Alignment, still do not affect the orientation result of the liquid crystal molecule rete of solidified forming.
There is no particular restriction to can be applicable to the mode of this second liquid crystal coating material 53 of coating in the present invention, implementer can consider that the convenience implemented is selected, comprise but be not limited only to, rotary coating (spin coating), line rod coating (bar coating), dipping formula coating (dip coating), slit coating (slot coating), or volume to volume is coated with coating methods such as (roll to roll coating).Further, implementer can add the coating thickness of regulation and control liquid crystal molecule rete on demand further through the line bar gauge lattice of rotating speed, use or winding rotary speed.
In addition, be coated with the second liquid crystal coating material 53 on the second surface 242 of light alignment film 24 after, drying can be carried out further to this second liquid crystal coating material 53, by in the second liquid crystal coating material 53 comprise the solvent removing of auxiliary coating, keep painting layer surface drying to be beneficial to follow-up processing process or preservation.Such as, can through heating plate drying, oven drying or vacuum drying etc., any method that other can apply known by skilled persons will, the convenience all can implemented because of it is selected.
Consult Fig. 6, another specific embodiment party face of the method for composite phase difference board produced according to the present invention, be coated with the second liquid crystal coating material 53 on the second surface 242 of light alignment film 24 before, the step that the second linear polar biased ultraviolet light 66 being different from the aforementioned first linear polar biased ultraviolet light 16 with another default polar biased direction 661 irradiates second surface 242 can be comprised further, be able to carry out orthodromic's arrangement along different preset direction to make second surface 242 glazing alignment film molecule.By this, when second liquid crystal coating material 53 is coated on second surface 242, just can have the direction that is different from orthodromic's arrangement of the first liquid crystal coating material 33, and then form the composite phase difference board 50 that a kind of first phase difference board 34 and second phase difference plate 54 have different orthodromic's orientation (i.e. alignment direction).
For preparing the above-mentioned composite phase difference board 50 with different alignment direction, the exposure dose of the second linear polar biased ultraviolet light 66, also without particular limitation in the present invention, as long as be greater than the exposure dose of the first linear polar biased ultraviolet light 16, light alignment film 24 just can be subject to the impact of the second linear polar biased ultraviolet light 66, change its orthodromic's orientation, implementer can consider the convenience implemented, and selects the exposure dose of the second suitable linear polar biased ultraviolet light 66.But the exposure dose of the higher second linear polar biased ultraviolet light 66, needs irradiate for a long time and comparatively consume energy.Therefore, the exposure dose of the second linear polar biased ultraviolet light 66 is to be not more than 1000mJ/cm
2for better, again to be not more than 500mJ/cm
2for better.
On the other hand, if the exposure dose of the first linear polar biased ultraviolet light 16 is too high, can make the molecular resin on the second surface 242 of light alignment film 24 after being subject to the first linear polar biased ultraviolet light 16 irradiation, orthodromic's arrangement is carried out and complete crosslinking curing along single default polar biased direction 161, and its orthodromic's orientation (be now complete crosslinking curing state, do not destroy its existing regiospecific) cannot be changed because being subject to the irradiation of the second linear polar biased ultraviolet light 66 again.Therefore, in time manufacturing a kind of first phase difference board 34 and have the composite phase difference board of different orthodromic's orientation from second phase difference plate 54, the exposure dose of the first linear polar biased ultraviolet light 16 is cured as principle completely not make light alignment film 24.May be implemented in the exposure dose of the of the present invention first linear polar biased ultraviolet light 16 to be not more than 300mJ/cm
2for good.
The present invention also proposes a kind of according to the composite phase difference board 50 obtained by preceding method, and it comprises:
(a) back up pad 42;
(b) one first phase difference board 34, it is arranged on this back up pad 42;
(c) smooth alignment film 24, it is arranged on this first phase difference board 34; And
(d) second phase difference plate 54, it is arranged on this light alignment film 24,
Wherein, this light alignment film 24 is in order to this first phase difference board 34 of orientation and this second phase difference plate 54, and this first phase difference board 34 has different alignment direction from this second phase difference plate 54.
According to preparation method of the present invention, only need to use single smooth alignment film, two phase difference board can be obtained, therefore effectively can reduce the use amount of alignment film, therefore there is cheaper process costs, and the composite phase difference board of slimming can be obtained.
In addition, preparation method of the present invention, in response to by light orientation method, therefore also synchronously can solve known brushing legal system produces particle and electrostatic on the surface in alignment film problem for compositeness phase difference board.
The present invention also provides a kind of composite phase difference board, because it more known composite phase difference board can use one deck alignment film less, so can reduce its thickness further, reaches effect of slimming.Below enumerate several embodiment with more elaboration method of the present invention, so it is only the use illustrated, and is not used to limit the present invention, and protection scope of the present invention is when be as the criterion with the accompanying claim person of defining.
Embodiment
The preparation of light alignment film
By resin-coated for light orientation on base material, then form a smooth alignment film via linear polar biased UV-irradiation Post RDBMS, comprise the following step:
1. by MEK (methylethylketone) and cyclopentanone (cyclopentanone) with the part by weight of 1: 1, be mixed with mixed solvent 3.5g.
2. get light orientation resin 0.5g (Switzerland Rolic, model ROP103, cinnamate system, solid content 10%), add the mixed solvent 3.5g that step 1 is prepared, the solid content of light orientation resin is diluted to 1.25%.
3. light orientation resin step 2 prepared, with method of spin coating (spin coating, 3000rpm, 40s) coat Polyester base material PET (Japanese Toyobo, model A4100,10cm × 10cm × 100 μm) make it flatten on the surface after, being placed on constant temperature is that in the baking oven of 100 DEG C, baking two minutes, to remove solvent, then is taken out and standingly treated that it returns back to room temperature.
4. step 3 being returned back to the light orientation resin of room temperature, take exposure dose as 20mJ/cm
2the first linear polar biased UV-irradiation, make it crosslinked and there is orthodromic's arrangement, forming a smooth alignment film.
The preparation of liquid crystal coating fluid
Liquid crystal coating fluid A: get 2g photocrosslinking type liquid crystal coating material (German Merck, model 03011, solid content 30%), add cyclopentanone 1g, is mixed with the liquid crystal coating fluid A that solid content is 20%.
Liquid crystal coating fluid B: photocrosslinking type liquid crystal coating material (Switzerland Rolic, model Rof5101, solid content 30%), can directly need not take via dilution adjustment.
Liquid crystal coating fluid C: get photocrosslinking type liquid crystal solid 1.35g (German BASF, model LC242), chiral dope material 0.11g (German BASF, model LC756) and light initiator 0.07g (U.S. Ciba, model TPO), add toluene to fill part dissolving, be mixed with the liquid crystal coating fluid C that solid content is 29.2%.
A. dissimilar composite phase difference board is prepared
Embodiment 1:
(1.1) 3g liquid crystal coating fluid A is got, after coating on light alignment film with method of spin coating (spin coating, 3000rpm, 40 seconds), being placed on constant temperature is that in the baking oven of 80 DEG C, baking 5 minutes, to remove solvent, is taken out afterwards again and standingly treated that it returns back to room temperature.Then pass to nitrogen and be simultaneously 20mJ/cm with exposure dose
2non-linear polar biased ultraviolet light (U.S. Fusion, model Fusion UV chamber) irradiate, make it be solidified to form the first phase difference board.Analyzing instrument and phasic difference value detector (Japanese prince's skill is surveyed, model Kobra) can be utilized to confirm that whether its orientation effect is good.
(1.2) with pressure-sensing glue, the first surface of the first phase difference board is pasted to a Triafol T base material TAC (Japanese Konica, 10cm × 10cm × 80 μm) on, and light alignment film and PET are peeled off, such that light alignment film is former to be exposed in air with the surface of contact (i.e. the second surface of light alignment film) of PET.
(1.3) 3g liquid crystal coating fluid B is got again, with method of spin coating (spin coating, 1000rpm, 40 seconds) coat stripping after light alignment film make it flatten on the surface, being placed on constant temperature is again that in the baking oven of 55 DEG C, baking 5 minutes, to remove solvent, then is taken out and standingly treated that it returns back to room temperature.Then pass to nitrogen and be simultaneously 470mJ/cm with exposure dose
2non-linear polar biased UV-irradiation, make it be solidified to form second phase difference plate.The composite phase difference board be prepared from can utilize analyzing instrument and phasic difference value detector to confirm that whether its orientation effect is good.
Embodiment 2:
(2.1) embodiment is as described in step (1.1), but is 170mJ/cm with exposure dose
2non-linear polar biased UV-irradiation, make it be solidified to form the first phase difference board.
(2.2) embodiment is as described in step (1.2).
(2.3) embodiment is as described in step (1.3).
Embodiment 3:
(3.1) embodiment is as described in step (1.1), but liquid crystal coating fluid is replaced into 5g liquid crystal coating fluid C, and is 300mJ/cm with exposure dose
2non-linear polar biased UV-irradiation, make it be solidified to form the first phase difference board.
(3.2) embodiment is as described in step (1.2).
(3.3) embodiment is as described in step (1.3).
Embodiment 4:
(4.1) embodiment is as described in step (1.1), but liquid crystal coating fluid is replaced into 3g liquid crystal coating fluid B, and is 470mJ/cm with exposure dose
2non-linear polar biased UV-irradiation, make it be solidified to form the first phase difference board.
(4.2) embodiment is as described in step (1.2).
(4.3) embodiment is as described in step (1.3), but liquid crystal coating fluid is replaced into 5g liquid crystal coating fluid C, and is 300mJ/cm with exposure dose
2non-linear polar biased UV-irradiation, make it be solidified to form second phase difference plate.
Embodiment 5:
(5.1) embodiment is as described in step (4.1), but is 700mJ/cm with exposure dose
2non-linear polar biased UV-irradiation, make it be solidified to form the first phase difference board.
(5.2) embodiment is as described in step (4.2).
(5.3) embodiment is as described in step (4.3).
Embodiment 6:
(6.1) embodiment is as described in step (4.1), but is 980mJ/cm with exposure dose
2non-linear polar biased UV-irradiation, make it be solidified to form the first phase difference board.
(6.2) embodiment is as described in step (4.2).
(6.3) embodiment is as described in step (4.3).
Comparative example 7:
(7.1) embodiment is as described in step (4.1), but is 1100mJ/cm with exposure dose
2non-linear polar biased UV-irradiation, make it be solidified to form the first phase difference board.
(7.2) embodiment is as described in step (4.2).
(7.3) embodiment is as described in step (4.3).
Irradiate in embodiment the exposure dose of non-linear polar biased ultraviolet light that the first phase difference board uses and the orientation effect of composite phase difference board compare converge whole as described in table 1.
The orientation effectiveness comparison of table 1 composite phase difference board
As shown in Table 1, the irradiation energy of the non-linear polar biased ultraviolet light used when irradiation first phase difference board is 1100mJ/cm
2time, namely its alignment direction with the identification of analyzing instrument, cannot represent that too high irradiation energy causes the orientation ability of light alignment film to be destroyed, and makes the orthodromic of preset direction arrange not obvious and not easily its alignment direction of identification.Therefore, the non-linear polar biased UV energy of irradiation first phase difference board that method produced according to the present invention uses, with 20 ~ 1000mJ/cm
2for better.
B. preparation has the composite phase difference board in different alignment direction
Comparative example 8:
(8.1) embodiment is as described in step (1.1), but liquid crystal coating fluid is replaced into 3g liquid crystal coating fluid B, and is 700mJ/cm with exposure dose
2non-linear polar biased UV-irradiation, make it be solidified to form the first phase difference board.
(8.2) embodiment is as described in step (1.2).
(8.3) embodiment is as described in step (1.3).
Comparative example 9:
(9.1) embodiment is as described in step (8.1).
(9.2) embodiment is as described in step (8.2), and is 10mJ/cm again with exposure dose
2and polar biased direction be orthogonal to the first linear polar biased ultraviolet light the second linear polar biased UV-irradiation after peeling off light alignment film surface (i.e. light alignment film second surface).
(9.3) embodiment is as described in step (8.3).
Comparative example 10:
(10.1) embodiment is as described in step (8.1).
(10.2) embodiment is as described in step (8.2), and is 20mJ/cm again with exposure dose
2and polar biased direction be orthogonal to the first linear polar biased ultraviolet light the second linear polar biased UV-irradiation in peel off after light alignment film surface.
(10.3) embodiment is as described in step (8.3).
Comparative example 11:
(11.1) embodiment is as described in step (8.1), but selected light alignment film utilizes exposure dose for 30mJ/cm
2the first linear polar biased UV-irradiation make it crosslinked and there is orthodromic's arrangement.
(11.2) embodiment is as described in step (8.2), and is 30mJ/cm again with exposure dose
2and polar biased direction be orthogonal to the first linear polar biased ultraviolet light the second linear polar biased UV-irradiation in peel off after light alignment film surface.
(11.3) embodiment is as described in step (8.3).
Comparative example 12:
(12.1) embodiment is as described in step (8.1), but selected light alignment film utilizes exposure dose for 100mJ/cm
2the first linear polar biased UV-irradiation make it crosslinked and there is orthodromic's arrangement.
(12.2) embodiment is as described in step (8.2), and is 50mJ/cm again with exposure dose
2and polar biased direction be orthogonal to the first linear polar biased ultraviolet light the second linear polar biased UV-irradiation in peel off after light alignment film surface.
(12.3) embodiment is as described in step (8.3).
Comparative example 13:
(13.1) embodiment is as described in step (8.1), but selected light alignment film utilizes exposure dose for 100mJ/cm
2the first linear polar biased UV-irradiation make it crosslinked and there is orthodromic's arrangement.
(13.2) embodiment is as described in step (8.2), and is 100mJ/cm again with exposure dose
2and polar biased direction be orthogonal to the first linear polar biased ultraviolet light the second linear polar biased UV-irradiation in peel off after light alignment film surface.
(13.3) embodiment is as described in step (8.3).
Embodiment 14:
(14.1) embodiment is as described in step (8.1).
(14.2) embodiment is as described in step (8.2), and is 25mJ/cm again with exposure dose
2and polar biased direction be orthogonal to the first linear polar biased ultraviolet light the second linear polar biased UV-irradiation in peel off after light alignment film surface.
(14.3) embodiment is as described in step (8.3).
Embodiment 15:
(15.1) embodiment is as described in step (8.1).
(15.2) embodiment is as described in step (8.2), and is 30mJ/cm again with exposure dose
2and polar biased direction be orthogonal to the first linear polar biased ultraviolet light the second linear polar biased UV-irradiation in peel off after light alignment film surface.
(15.3) embodiment is as described in step (8.3).
Embodiment 16:
(16.1) embodiment is as described in step (8.1).
(16.2) embodiment is as described in step (8.2), and is 50mJ/cm again with exposure dose
2and polar biased direction be orthogonal to the first linear polar biased ultraviolet light the second linear polar biased UV-irradiation in peel off after light alignment film surface.
(16.3) embodiment is as described in step (8.3).
Embodiment 17:
(17.1) embodiment is as described in step (8.1), but selected light alignment film utilizes exposure dose for 30mJ/cm
2the first linear polar biased UV-irradiation make it crosslinked and there is orthodromic's arrangement.
(17.2) embodiment is as described in step (8.2), and is 40mJ/cm again with exposure dose
2and polar biased direction be orthogonal to the first linear polar biased ultraviolet light the second linear polar biased UV-irradiation in peel off after light alignment film surface.
(17.3) embodiment is as described in step (8.3).
Embodiment 18:
(18.1) embodiment is as described in step (8.1), but selected light alignment film utilizes exposure dose for 30mJ/cm
2the first linear polar biased UV-irradiation make it crosslinked and there is orthodromic's arrangement.
(18.2) embodiment is as described in step (8.2), and is 60mJ/cm again with exposure dose
2and polar biased direction be orthogonal to the first linear polar biased ultraviolet light the second linear polar biased UV-irradiation in peel off after light alignment film surface.
(18.3) embodiment is as described in step (8.3).
Embodiment 19:
(19.1) embodiment is as described in step (8.1), but selected light alignment film utilizes exposure dose for 100mJ/cm
2the first linear polar biased UV-irradiation make it crosslinked and there is orthodromic's arrangement.
(19.2) embodiment is as described in step (8.2), and is 150mJ/cm again with exposure dose
2and polar biased direction be orthogonal to the first linear polar biased ultraviolet light the second linear polar biased UV-irradiation in peel off after light alignment film surface.
(19.3) embodiment is as described in step (8.3).
In embodiment polar biased direction be orthogonal to the first linear polar biased ultraviolet light the second linear polar biased ultraviolet light exposure dose and orientation effect compare converge whole as described in table 2.
The orientation effectiveness comparison of table 2 after-sun light alignment film
As shown in Table 2, when the second linear polar biased ultraviolet light is not more than the irradiation energy difference of the first linear polar biased ultraviolet light, the light orientation molecular resin of second surface then can be made unstable, cannot orthodromic arrange and produce Mura equably, be difficult to observe its orientation and deflection effect through analyzing instrument.
Therefore, the irradiation energy of the second linear polar biased ultraviolet light that method produced according to the present invention uses, the irradiation energy of the first linear polar biased ultraviolet light must be greater than, the second surface of light alignment film can be made to have the alignment direction being different from first surface, further can prepare the composite phase difference board (namely the first phase difference board is different from the alignment direction of second phase difference plate) with different alignment direction.
Claims (18)
1. prepare a method for composite phase difference board, it comprises:
A () provides one first back up pad;
B () is coated with a smooth orientation resin in the upper surface of this first back up pad, and with one first this light orientation resin of linear polar biased UV-irradiation, make it carry out light orientation reaction, to form a smooth alignment film;
C () is coated with one first liquid crystal coating material on the first surface of this light alignment film, and with this first liquid crystal coating material of one first non-linear polar biased UV-irradiation, make it solidify to form one first phase difference board;
D the first surface of this first phase difference board sticks on one second back up pad by (), then this light alignment film and this first back up pad are peeled off, and exposes to the open air to make the second surface of this light alignment film;
(e) with one second linear polar biased UV-irradiation on the second surface of this light alignment film, wherein the polar biased direction of this second linear polar biased ultraviolet light is different from the polar biased direction of the first linear polar biased ultraviolet light, and the energy of this second linear polar biased UV-irradiation is greater than the energy of the first linear polar biased UV-irradiation; And
F () is coated with one second liquid crystal coating material on the second surface of this light alignment film, then with this second liquid crystal coating material of the second non-linear polar biased UV-irradiation, make it solidify to form a second phase difference plate.
2. the method for claim 1, wherein the energy of this first non-linear polar biased UV-irradiation is 20 ~ 1000mJ/cm
2.
3. the method for claim 1, wherein the energy of this first non-linear polar biased UV-irradiation is 170 ~ 500mJ/cm
2.
4. the method for claim 1, wherein the energy of this first linear polar biased UV-irradiation is for being not less than 5mJ/cm
2.
5. the method for claim 1, wherein the energy of this second non-linear polar biased UV-irradiation is for being not less than 20mJ/cm
2.
6. the method for claim 1, wherein the coating thickness of this light alignment film is 10nm ~ 1 μm.
7. the method for claim 1, wherein this light orientation resin is photocrosslinking type light orientation resin.
8. method as claimed in claim 7, wherein this light orientation resin has the group being selected from cinnamic acid ester group (cinnamate), cumarin ester group (coumarin), styryl phenyl ketone group (Chalcone), dimaleoyl imino (maleimide), quinoline ketone group (quinolinone) and two benzylidene (bisbenzylidene) and forming, at least one of them functional group.
9. the method for claim 1, wherein this first liquid crystal coating material is the photocrosslinking type liquid crystal material with acryl functional group.
10. the method for claim 1, wherein this second liquid crystal coating material is the photocrosslinking type liquid crystal material with acryl functional group.
11. the method for claim 1, wherein the material of this first back up pad is glass, Triafol T resin (Triacetyl Cellulose), polyester based resin (polyester-based resin), acetic acid system resin (acetate-based resin), polyethersulfone system resin (polyethersulfone-based resin), polycarbonate-based resin (polycarbonate-based resin), polyamide series resin (polyamide-based resin), polyimide system resin (polyimide-based resin), polyolefin-based resins (polyolefin-based resin), acrylic ester resin (acrylic-based resin), polyvinyl chloride resin (polyvinyl chloride-based resin), polystyrene resin (polystyrene-based resin), polyvinyl alcohol resin (polyvinyl alcohol-based resin), polyarylate system resin (polyarylate-based resin), polyphenylene sulfide system resin (polyphenylene sulfide-based resin), the sub-vinylite (polyvinylidene chloride-based resin) of poly-dichloro or methacrylate ester resin ((methyl) acrylic-based resin).
12. the method for claim 1, wherein the material of this second back up pad is glass, Triafol T resin (Triacetyl Cellulose), polyester based resin (polyester-based resin), acetic acid system resin (acetate-based resin), polyethersulfone system resin (polyethersulfone-based resin), polycarbonate-based resin (polycarbonate-based resin), polyamide series resin (polyamide-based resin), polyimide system resin (polyimide-based resin), polyolefin-based resins (polyolefin-based resin), acrylic ester resin (acrylic-based resin), polyvinyl chloride resin (polyvinyl chloride-based resin), polystyrene resin (polystyrene-based resin), polyvinyl alcohol resin (polyvinyl alcohol-based resin), polyarylate system resin (polyarylate-based resin), polyphenylene sulfide system resin (polyphenylene sulfide-based resin), the sub-vinylite (polyvinylidene chloride-based resin) of poly-dichloro or methacrylate ester resin ((methyl) acrylic-based resin).
13. the method for claim 1, wherein this second back up pad is release film, Polarizer, diaphragm, diffusion barrier, diffuser plate, light guide plate, brightness enhancement film, flexible panel extends roller or contact panel.
14. the method for claim 1, wherein the upper surface of this first back up pad is the surface once promoting release effect process.
15. the method for claim 1, wherein in this step (b), after the upper surface of this first back up pad is coated with this light orientation resin, comprises a pair this light orientation resin further and carry out dry step.
16. the method for claim 1, wherein in this step (c), be coated with this first liquid crystal coating material on the first surface of this light alignment film after, comprise a pair this first liquid crystal coating material further and carry out dry step.
17. the method for claim 1, wherein in this step (e), be coated with this second liquid crystal coating material on the second surface of this light alignment film after, comprise a pair this second liquid crystal coating material further and carry out dry step.
18. 1 kinds through the composite phase difference board obtained by the method for claim 1, it comprises:
(a) back up pad;
(b) one first phase difference board, it is arranged on this back up pad;
(c) smooth alignment film, it is arranged on this first phase difference board; And
(d) second phase difference plate, it is arranged on this light alignment film,
Wherein, this light alignment film is in order to this first phase difference board of orientation and this second phase difference plate, and this first phase difference board has different alignment direction from this second phase difference plate.
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| CN105093378A (en) * | 2014-05-07 | 2015-11-25 | 远东新世纪股份有限公司 | Method for manufacturing phase difference plate and phase difference plate |
| CN110275239B (en) * | 2019-06-27 | 2021-04-27 | 昆山工研院新型平板显示技术中心有限公司 | Polaroid, display panel and preparation method of display panel |
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| US7075606B2 (en) * | 2003-07-29 | 2006-07-11 | Eastman Kodak Company | Method for manufacturing an optical compensator on a transitional substrate |
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