CN109307956A - A kind of preparation method of optical anisotropic film - Google Patents
A kind of preparation method of optical anisotropic film Download PDFInfo
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- CN109307956A CN109307956A CN201710631925.XA CN201710631925A CN109307956A CN 109307956 A CN109307956 A CN 109307956A CN 201710631925 A CN201710631925 A CN 201710631925A CN 109307956 A CN109307956 A CN 109307956A
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- substrate
- layers
- liquid crystal
- birefringent layers
- crystal material
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1337—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1337—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers
- G02F1/13378—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers by treatment of the surface, e.g. embossing, rubbing or light irradiation
Abstract
The invention discloses a kind of preparation methods of optical anisotropic film, the described method includes: forming both alignment layers on the first substrate first, secondly the polymerisable liquid crystal material of liquid is coated in the both alignment layers, form birefringent layers, then the birefringent layers are bonded with the second substrate, the inner surface that wherein the second substrate contacts the birefringent layers has micro-structure, then orientation is carried out to the liquid crystal material in the birefringent layers, and the birefringent layers are solidified, finally remove the first substrate and the both alignment layers.The preparation method of optical anisotropic film disclosed by the invention has many advantages, such as production operation simple, high production efficiency, saves cost, the optical anisotropic film prepared with the method light guide plate, backlight assembly, in terms of have a wide range of applications.
Description
Technical field
The present invention relates to field of display technology, in particular to a kind of preparation method of optical anisotropic film.
Background technique
Liquid crystal display (Liquid Crystal Display) is the widely used important component of electronic equipment.Liquid crystal
Showing that device is needed by backlight come the driving that shines, existing backlight emergent light is generally natural light, and in actually utilizing only
The light of a certain particular polarization is needed, to cause the problems such as light utilization efficiency is low, display energy consumption is high.One of solution party
Case is the diaphragm for designing and producing a kind of polarised light that natural light can be converted to particular polarization.After the diaphragm, backlight
Source can direct outgoing polarization light, greatly enhance the utilization rate of light, and without being further added by other compensating structures, such as
Diffusion barrier, brightness enhancement film etc. reduce the complexity of back light source structure.For Leading format equipment, the backlight of the diaphragm is used
Display can effectively reduce energy consumption, extends equipment and uses the time.
A kind of similar polarised light back light system is described in patent US7812899B2, wherein each comprising such optics
The production method of anisotropy film.But in that patent, in production method, the structure for playing orientation is preset in one layer
In complicated microstructured layers, it is used to LCD alignment.If capacity of orientation is inadequate, it is also necessary to the side being orientated using bilateral
Formula.This method makes the manufacturing process of microstructured layers excessively complicated, to improve cost of manufacture, reduces production efficiency.
Accordingly, it is desirable to provide a kind of production method of optical anisotropic film simple to operation, reduces production production
Difficulty is saved cost, is improved efficiency.
Summary of the invention
To meet the demand, the present invention proposes a kind of method for preparing optical anisotropic film, which comprises
Both alignment layers are formed on one substrate；The polymerisable liquid crystal material that liquid is coated in the both alignment layers, forms birefringent layers；By institute
It states birefringent layers to be bonded with the second substrate, wherein the surface that the second substrate contacts the birefringent layers has micro-structure；It is right
The liquid crystal material in the birefringent layers carries out orientation；The birefringent layers are solidified；And remove described first
Substrate and the both alignment layers.In preferred embodiments, wherein after the formation both alignment layers the step of, including it is warming up to operation
Temperature, the operation temperature is between 50 DEG C to 180 DEG C.
In preferred embodiments, in the step of carrying out orientation to the liquid crystal material in the birefringent layers, including will
First substrate, both alignment layers, birefringent layers and the second substrate of fitting are placed under the operation temperature as a whole, moreover, institute
It states first substrate and is located at the whole bottom.
In preferred embodiments, the refringence of the extraordinary ray of the liquid crystal material and ordinary light is not less than 0.1.?
In further preferred embodiment, the extraordinary ray of the liquid crystal material and the refringence of ordinary light are not less than 0.15.Again
In further preferred embodiment, the extraordinary ray of the liquid crystal material and the refringence of ordinary light are not less than 0.2.
In preferred embodiments, the micro-structure in the second substrate is equally distributed repetitive unit.Into
In one step preferred embodiment, the extending direction of the repetitive unit is consistent with the alignment direction of the both alignment layers.
In preferred embodiments, the production method of the second substrate include: coated in support layer surface it is curable
Liquid material forms liquid material layer；Formwork structure is bonded with the liquid material layer, wherein the formwork structure contacts institute
The inner surface for stating liquid material layer is structured surface, is used to form the micro-structure；The liquid material layer is solidified；
And remove the formwork structure.In preferred embodiments, the refractive index of the liquid material layer after solidification and the liquid
The ordinary refraction index of brilliant material is substantially consistent.In preferred embodiments, the supporting layer and the liquid after solidifying
The light transmittance of material layer is greater than 90%.In further preferred embodiment, the supporting layer and the liquid material after solidifying
The light transmittance of the bed of material is greater than 95%.
In preferred embodiments, the first substrate may include optical glass or polymeric material rigid or flexible
Material.
In preferred embodiments, described solid in the step of solidifying to the liquid crystal material in the birefringent layers
The mode of change includes UV solidification or heat cure.In preferred embodiments, the first substrate and the both alignment layers are being removed
In step, the mode of the removal includes mechanical removal mode at a certain temperature, wherein the specific temperature is arrived at 25 DEG C
Between 180 DEG C.
The preparation method of optical anisotropic film disclosed by the invention, the orientation side oriented using both alignment layers single-sided friction
Method, and using in optical anisotropic film micro-structure and Gravity Problem improve the efficiency of liquid crystal aligning, thus make optics respectively to
The production production difficulty of anisotropic film substantially reduces, to improve production efficiency, reduces production cost.
Detailed description of the invention
The present invention may be better understood by referring to illustrating for embodiment of the present invention, in the accompanying drawings:
Fig. 1 is the flow diagram of disclosed preparation method according to the present invention.
Fig. 2 is the operation chart according to embodiments of the present invention for forming both alignment layers.
Fig. 3 is the flow diagram according to embodiments of the present invention for forming the second substrate.
Specific embodiment
In the following description, it in order to reach purpose of explanation to have a comprehensive understanding to the present invention, illustrates
A large amount of detail, it will be evident, however, that those skilled in the art, it can also be real without these details
The existing present invention.In other examples, well known construction and device is shown in box chart.In this respect, that is lifted is illustrative
Example embodiment only for explanation, the present invention is not caused to limit.Therefore, protection scope of the present invention is not by following
Specific embodiment is limited, and is only subject to the range of appended claims.
The present invention provides a kind of methods for preparing optical anisotropic film, are described in detail below according to diagram.Such as
Shown in Fig. 1, a kind of preparation method disclosed according to the present invention is shown.
The first step forms both alignment layers 2 on first substrate 1.In preferred embodiments, the side of friction matching can be used
Formula, concrete operations are as follows: one layer of alignment materials are first coated on first substrate 1, after being baked admittedly to this layer of alignment materials, benefit
With the idler wheel with flannelette configured with alignment materials layer first substrate 1 on follow parallel in 1 any group of side of first substrate
First direction rub to entire alignment materials layer, as shown in Fig. 2, to forming both alignment layers 2.First substrate 1 may include
Hard material, such as optical glass may also comprise flexible parent metal, such as PET.In preferred embodiments, the alignment materials
For polyimides.In addition to friction matching technology, non-model control alignment technique can also be used, comprising: photo orientated technology, inclination are steamed
Plating method, LB membrane technology or other any technologies for making LCD alignment and material.
Second step coats liquid liquid crystal material in both alignment layers 2, forms birefringent layers 3.Can first by first substrate 1 and it match
It is warming up to operation temperature, and preheated one-section time to layer 2, then coats liquid liquid crystal material to the first base along a first direction
On plate 1, directly contacted with both alignment layers 2.Before use, liquid crystal material needs heating in advance to melt and carry out vacuum outgas.Liquid crystal
Material is polymerizable liquid crystal, while the refringence of its extraordinary ray and ordinary light is not less than 0.1.In preferred embodiment
In, the extraordinary ray of the liquid crystal material and the refringence of ordinary light are not less than 0.15.In further preferred embodiment
In, the extraordinary ray of the liquid crystal material and the refringence of ordinary light are not less than 0.2.It, can be by Meyer in coating procedure
Stick or the softer roller of quality control the thickness and the uniformity of birefringent layers 3, and mechanical roll-in or slot coated etc. can also be used
Method.Entire coating procedure needs to avoid the influence of ultraviolet light, avoids liquid crystal material premature cure, nothing under ultraviolet irradiation
Method orientation.
Third step, by having the device of pressing function to be bonded birefringent layers 3 with the second substrate 4, wherein second
The inner surface of substrate 4 has the micro-structure extended along a first direction.Micro-structure can be equidistant prism structure arranged in parallel,
Its section can be isosceles triangle or right angled triangle.When fitting, the mode of pressing can be used, be located at the second substrate 4 two-fold
The top for penetrating layer 3 is gradually pressurizeed on the upper surface of the second substrate 4, makes the lower surface with micro-structure of the second substrate 4 and double
Contact that the upper surface of refracting layer 3 is seamless, and it is completely disposed at the micro-structure on 4 lower surface of the second substrate in birefringent layers 3.It is logical
Pressure when control pressing is crossed, can control the thickness of birefringent layers 3.The device wherein with pressing function includes roller, air bag
Device etc..
As shown in figure 3, the production of the second substrate 4 can include: first coat the uniform liquid of a layer thickness on 41 surface of supporting layer
Body material forms liquid material layer 42；Then formwork structure 43 is bonded with the supporting layer 41 for being coated with liquid material layer 42,
The inner surface of middle 43 contact liq material layer 42 of formwork structure has groove structure arranged in parallel, is used to form corresponding micro-
Then structure carries out UV illumination curing to liquid material layer 42；After solidification, formwork structure 43 is removed, can be obtained includes branch
Support the second substrate 4 of layer 41 and microstructured layers 44.When fitting, the mode of pressing can be used, formwork structure 43 is placed in liquid material
42 top of the bed of material, gradually pressurizes on the upper surface of formwork structure 43, is completely filled with the fluent material in liquid material layer 42
Groove in formwork structure 43.Pressure when by control pressing, can control the thickness of made microstructured layers 44.Wherein have
The device for having pressing function includes roller, airbag apparatus etc..Supporting layer 41 is flexible parent metal.Liquid material layer 42 is by curable
Polymer material composition, such as optical glue, resin, are optically isotropic material after solidification, are had and birefringent layers 3
The substantially the same refractive index of the ordinary refraction index of middle liquid crystal material.Supporting layer 41 and the liquid material layer 42 after solidifying it is saturating
Light rate is greater than 90%.In preferred embodiments, supporting layer 41 and the light transmittance of the liquid material layer 42 after solidifying are greater than
95%.Formwork structure 43 can be metal material, and the diamond cutter seal cutting groove structure polished can be used when production.Formwork structure 43
It is reusable, save the cost.In preferred embodiments, the distance between the adjacent grooves structure on 43 surface of formwork structure is
Equal, to make the equally distributed repetitive unit of micro-structure on finally formed 4 surface of the second substrate, as shown in Figure 3.
4th step after the completion of fitting, overall structure is placed at a certain temperature, makes the liquid crystal material in birefringent layers 3
It is arranged according to preset direction, to carry out orientation to the liquid crystal material in birefringent layers 3.Wherein due to the friction side of both alignment layers 2
To so the liquid crystal molecule in birefringent layers 3 can be arranged along alignment direction, that is, being parallel to micro- along first direction
The extending direction of structure, thus make the refractive indices n of birefringent layers 3 the direction orthogonal with micro-structure extending direction most
Greatly, the efficiency of polarization separation is improved.Entire process of alignment needs certain time to maintain, length of time can with product size,
The change of properties of birefringent material, can be from 1 minute to 30 minute or longer.In process of alignment, first substrate 1 needs
Positioned at bottom, to improve the efficiency of LCD alignment using gravity.
5th step after orientation, solidifies birefringent layers, is integrally formed it with the second substrate 4.Optional real
It applies in scheme, birefringent layers 3 can be irradiated by the second substrate 4 with the UV light of certain strength, wavelength, 3 meeting of birefringent layers
Polymerization reaction occurs under the irradiation of UV to form cured state.Photoinitiator is added in birefringent layers 3 in advance, is added
Ratio is not more than 0.5%.When solidification, the time of UV light irradiation is not only related with UV luminous intensity, also has with the concentration of photoinitiator
It closes.In preferred embodiments, the energy range on UV unit area when solidification is 0.1mJ/cm2~10J/cm2.One
In a optional embodiment, the liquid crystal material in birefringent layers 3 is RM257, the cured a length of 365nm of UV light wave.Due to solid
The selection of UV optical wavelength is related with the liquid crystal material of birefringent layers 3 when change, according to the difference of birefringent material used, other wavelength
UV light can also be used.
Wherein, from second step to the 5th step, operation needs to carry out at a certain temperature.In operation temperature and birefringent layers 3
Liquid crystal material property it is related, such as birefringence, stickiness.Its temperature range is 50 DEG C to 180 DEG C.In preferred embodiment party
In case, liquid crystal material RM257, operation temperature is 75 DEG C.
6th step removes first substrate 1 and both alignment layers 2, to obtain the light being made of the second substrate 4 and birefringent layers 3
Learn anisotropic membrane.Removal mode includes mechanical removal mode at a certain temperature.Specific temperature can for 25 DEG C to 180 DEG C it
Between a temperature.
In conclusion the preparation method of optical anisotropic film disclosed by the invention, is oriented using both alignment layers single-sided friction
Alignment method, and using in optical anisotropic film micro-structure and Gravity Problem improve the efficiency of liquid crystal aligning, to make
The production production difficulty of optical anisotropic film substantially reduces, to improve production efficiency, reduces production cost.
Although having been described above with the several exemplary implementation schemes of datail description, disclosed embodiment is only
Exemplary and those skilled in the art will readily appreciate that and not restrictive, a lot of other in an exemplary embodiment
It is possible for modifying, changing and/or replacing, and the novel teachings and advantage of the disclosure are deviateed without essence.Therefore, all these
Modification, change and/or replacement are intended to be included in the scope of the present disclosure as defined by the appended claims.
Claims (15)
1. a kind of preparation method of optical anisotropic film, described method includes following steps:
Both alignment layers are formed on the first substrate；
The polymerisable liquid crystal material that liquid is coated in the both alignment layers, forms birefringent layers；
The birefringent layers are bonded with the second substrate, wherein the inner surface that the second substrate contacts the birefringent layers has
Micro-structure；
Orientation is carried out to the liquid crystal material in the birefringent layers；
The birefringent layers are solidified；And
Remove the first substrate and the both alignment layers.
2. the method as described in claim 1, wherein further comprising being warming up to operation after the formation both alignment layers the step of
Temperature, the operation temperature is between 50 DEG C to 180 DEG C.
3. method according to claim 2, wherein in the step for carrying out orientation to the liquid crystal material in the birefringent layers
In rapid, the first substrate, the both alignment layers, the birefringent layers and the second substrate including that will be bonded exist as a whole
It is placed under the operation temperature, wherein the first substrate is located at the whole bottom.
4. the method as described in one of claim 1-3, wherein the refractive index of the extraordinary ray of the liquid crystal material and ordinary light
Difference is not less than 0.1.
5. the method as described in one of claim 1-3, wherein the refractive index of the extraordinary ray of the liquid crystal material and ordinary light
Difference is not less than 0.15.
6. the method as described in one of claim 1-3, wherein the refractive index of the extraordinary ray of the liquid crystal material and ordinary light
Difference is not less than 0.2.
7. the method as described in one of claim 1-3, wherein the micro-structure in the second substrate is equally distributed
Repetitive unit.
8. the method for claim 7, wherein the alignment direction of the extending direction of the repetitive unit and the both alignment layers
Unanimously.
9. the method as described in claim 1, wherein the production method of the second substrate includes:
Curable liquid material is coated in support layer surface, forms liquid material layer；
Formwork structure is bonded with the liquid material layer, wherein the formwork structure contacts the inner surface of the liquid material layer
For structured surface, it is used to form the micro-structure；
The liquid material layer is solidified；And
Remove the formwork structure.
10. method as claimed in claim 9, wherein the refractive index of the liquid material layer after solidifying and the liquid crystal material
Ordinary refraction index it is substantially consistent.
11. method as claimed in claim 9, wherein the supporting layer and the light transmittance of the liquid material layer after solidifying are big
In 90%.
12. method as claimed in claim 9, wherein the supporting layer and the light transmittance of the liquid material layer after solidifying are big
In 95%.
13. the method as described in one of claim 1-3, wherein the first substrate includes optical glass or rigid or soft
The polymer material of property.
14. the method as described in claim 1, wherein in the step of solidifying to the birefringent layers, it is described cured
Mode includes UV solidification or heat cure.
15. the method as described in claim 1, wherein in the step of removing the first substrate and the both alignment layers, it is described
The mode of removal includes mechanical removal mode at a certain temperature, wherein the specific temperature is between 25 DEG C to 180 DEG C.
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| CN201710631925.XA CN109307956A (en) | 2017-07-28 | 2017-07-28 | A kind of preparation method of optical anisotropic film |
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| CN201710631925.XA CN109307956A (en) | 2017-07-28 | 2017-07-28 | A kind of preparation method of optical anisotropic film |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101881848A (en) * | 2010-07-01 | 2010-11-10 | 深圳超多维光电子有限公司 | Manufacturing and detecting device and method for double-refraction lens grating |
| CN101968595A (en) * | 2010-10-13 | 2011-02-09 | 深圳市华星光电技术有限公司 | 2D and 3D switching liquid crystal lens assembly and display device |
| CN106468842A (en) * | 2016-12-27 | 2017-03-01 | 宁波视睿迪光电有限公司 | Birefringent lens film and its manufacture method |
-
2017
- 2017-07-28 CN CN201710631925.XA patent/CN109307956A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101881848A (en) * | 2010-07-01 | 2010-11-10 | 深圳超多维光电子有限公司 | Manufacturing and detecting device and method for double-refraction lens grating |
| CN101968595A (en) * | 2010-10-13 | 2011-02-09 | 深圳市华星光电技术有限公司 | 2D and 3D switching liquid crystal lens assembly and display device |
| CN106468842A (en) * | 2016-12-27 | 2017-03-01 | 宁波视睿迪光电有限公司 | Birefringent lens film and its manufacture method |
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