CN104777675B - A method of control cholesteric liquid crystal grating orientation - Google Patents
A method of control cholesteric liquid crystal grating orientation Download PDFInfo
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- CN104777675B CN104777675B CN201510211664.7A CN201510211664A CN104777675B CN 104777675 B CN104777675 B CN 104777675B CN 201510211664 A CN201510211664 A CN 201510211664A CN 104777675 B CN104777675 B CN 104777675B
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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
- 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
- G02F1/133788—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 by light irradiation, e.g. linearly polarised light photo-polymerisation
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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
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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
- G02F1/133796—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers having conducting property
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- Crystallography & Structural Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Polarising Elements (AREA)
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Abstract
The invention discloses a kind of methods of control cholesteric liquid crystal grating orientation, include the following steps：(1) light orientation material is coated on the conductive layer surface of electrically-conductive backing plate；(2) conductive layer surface that electrically-conductive backing plate is coated with light orientation material is irradiated by mask system with linearly polarized light, be exposed；(3) after rotating different polarization angles, in the different zones of electrically-conductive backing plate, above-mentioned (2) step is repeated several times.(4) after liquid crystal cell being made in the two electrically-conductive backing plates alignment after exposure, it is heated to clearing point or more, the mixture of the nematic liquid crystal for being equally heated to clearing point or more, chiral material, polymerized monomer, initiator is filled again, and natural cooling makes liquid crystal molecule reorientation；(5) alternating voltage is added on liquid crystal cell after the cooling period, forms grating.Arbitrary graphic may be implemented in the method for the present invention and prepared by the control of differently- oriented directivity, is not necessarily to mechanical registeration, considerably increases the flexibility and diversification of liquid crystal grating making.
Description
Technical field
The invention belongs to liquid crystal grating technical fields, and in particular to a method of control cholesteric liquid crystal grating orientation.
Background technology
Upper in the research or application of liquid crystal, how to allow the arrangement of ordered liquid crystal molecule is critically important committed step, one
As be known as LCD alignment.Most common LCD alignment method is coated on substrate surface for alignment materials and is formed by film, then
The long key molecule of orientation film is set to generate directive arrangement using friction mode, when liquid crystal molecule adsorbs orientation film and borrows
It intermolecular force and generates orderly Liquid Crystal Molecules Alignment.The final effect for realizing LCD alignment.Friction matching method can carry
For the stronger orientation ability of liquid crystal molecule, but during friction, due to the friction of flannelette contact, will produce electrostatic,
It scratches, the pollution of dust, and these pollutions often directly contribute the damage of liquid crystal cell, and product yield is caused to decline.
Therefore whether academia or all contactless in the continuous Improvement orientation mode of industry, in addition to that can keep away
Exempt from the pollution of electrostatic and particle, the orientation mode of control liquid crystal molecule can also be easier to.Wherein be most widely used is light
Orientation.
So far, have a variety of orientation mechanism such as light decomposition method, photoisomerization method, photodimerization method, optical cross-linking method.With
Rubbing manipulation is compared, and light orientation method has many advantages, such as follows：Do not generate electrostatic and dust；Such as major axes orientation can effectively be controlled, tilted
The parameters such as angle and anchoring energy；In addition, light alignment technique makes liquid crystal that can be applied in terms of telecommunications and organic electronic, and these for
Friction techniques or very problematic.
Liquid crystal grating is compared with traditional mechanical devices with small, driving voltage is low, small power consumption, high resolution, spreads out
It penetrates characteristic changing and the various advantages such as facilitates, diffraction optics, spectral measurement, light beam deflection control, optical information can be widely used for
The every field such as processing, optical oomputing, optical communication field.
The basic device structure of traditional liquid crystal grating is as shown in Figure 1：It is filled out between top glass substrate 6 and lower glass substrate 1
Filling has the nematic liquid crystal 4 of dielectric constant anisotropy, forms liquid crystal cell.Transparent seek is formed in lower glass substrate 1
Location electrode 2 and liquid crystal orientation film 3a are formed with transparent grounding electrode 5 and liquid crystal orientation film 3b in top glass substrate 6.
Cholesteric liquid crystal can be allocated by nematic liquid crystal and chiral material, and pass through polymerized monomer and initiator
Addition is stabilized.Cholesteric liquid crystal grating is the phase grating of the periodic arrangement based on cholesteric liquid crystal planar,
It was also one of the hot spot of research in recent years due to its application prospect on beam modulation device.According to non-patent literature cholesteric
The screw pitch ratio for the thickness and cholesteric liquid crystal that the stripe direction of phase liquid crystal grating depends on liquid crystal cell also has the arrangement of matrix to take
To such as Fig. 2.The direction of middle layer liquid crystal molecule determines direction face, and then determines stripe direction.If this means that
Striped changes the orientation of middle layer liquid crystal molecule, and the changeable stripe direction for re-forming grating before being formed.
Invention content
The purpose of the present invention is to provide a kind of methods of control cholesteric liquid crystal grating orientation.
The specific technical solution of the present invention is as follows：
A method of control cholesteric liquid crystal grating orientation includes the following steps：
(1) one layer of light orientation material is uniformly coated on the conductive layer surface of two electrically-conductive backing plates；
(2) linearly polarized light for being 280-410nm with wavelength is vertical or irradiates conduction by mask system with certain inclination angle
Substrate is coated with the conductive layer surface of light orientation material, controls light intensity and the time is exposed；
(3) after rotating different polarization angles, in the different zones of electrically-conductive backing plate, above-mentioned (2) step is repeated several times.
(4) after liquid crystal cell being made in the two electrically-conductive backing plates alignment after exposure, it is heated to clearing point or more, then fills same add
The mixture of more than heat to clearing point nematic liquid crystal, chiral material, polymerized monomer, initiator, natural cooling make liquid crystal point
Sub- reorientation, above-mentioned nematic liquid crystal, chiral material, polymerized monomer, initiator mass ratio be 90~99:1~3:0~7:
0~1；
(5) when polymerized monomer and initiator are not 0, alternating voltage is added on liquid crystal cell after the cooling period, forms grating, and
With ultraviolet light-initiated rock-steady structure；When polymerized monomer and initiator are 0, then alternating voltage is added on liquid crystal cell after the cooling period,
Grating is formed, without with ultraviolet light-initiated rock-steady structure.
In a preferred embodiment of the invention, the light orientation material is azo light orientation material SD1, SD2
Or SDA1；The nematic liquid crystal be E7, E48,5CB, MDA-00-3461, MDA-00-3506, ZLI 2293, ZLI 4788,
At least one of BL006, BLO36 and MLC 6608；The polymerized monomer be RM257, RM84, RM206, RM691, C6M,
At least one of BAHB and SLC1717；The chiral material be S811, R811, BDH1281, COC, R1011, R5011,
At least one of CB15, MLC6248 and BP-CD3；The initiator be Irgacure 127, Irgacure 184,
Irgacure 651、Irgacure 784、Irgacure 819、Irgacure 1173、Irgacure 2202、Irgacure
At least one of 2959 and Chemcure-481.
In a preferred embodiment of the invention, the mask system is contact mask system, proximity mask
System, projection mask system or dynamic mask formula lithography system.
Another technical solution of the present invention is as follows：
A method of control cholesteric liquid crystal grating orientation, it is characterised in that：Include the following steps：
(1) one layer of light orientation material is uniformly coated on the conductive layer surface of two electrically-conductive backing plates；
(2) liquid crystal cell is made in above-mentioned two electrically-conductive backing plate, the linearly polarized light for being 280-410nm with wavelength is vertical or with certain
Above-mentioned liquid crystal cell is irradiated at inclination angle, controls light intensity and the time is exposed；
(3) after rotating different polarization angles, in the different zones of liquid crystal cell, above-mentioned (2) step is repeated several times.
(4) nematic liquid crystal for being heated to clearing point or more, chiral material, polymerized monomer, initiation are filled in liquid crystal cell
After the mixture of agent, natural cooling, above-mentioned nematic liquid crystal, chiral material, polymerized monomer, initiator mass ratio be 90~
99:1~3:0~7:0~1；
(5) when polymerized monomer and initiator are not 0, alternating voltage is added on liquid crystal cell after the cooling period, forms grating, and
With ultraviolet light-initiated rock-steady structure；When polymerized monomer and initiator are 0, then alternating voltage is added on liquid crystal cell after the cooling period,
Grating is formed, without with ultraviolet light-initiated rock-steady structure.
In a preferred embodiment of the invention, the light orientation material is azo light orientation material SD1, SD2
Or SDA1；The nematic liquid crystal be E7, E48,5CB, MDA-00-3461, MDA-00-3506, ZLI 2293, ZLI 4788,
At least one of BL006, BLO36 and MLC 6608；The polymerized monomer be RM257, RM84, RM206, RM691, C6M,
At least one of BAHB and SLC1717；The chiral material be S811, R811, BDH1281, COC, R1011, R5011,
At least one of CB15, MLC6248 and BP-CD3；The initiator be Irgacure 127, Irgacure 184,
Irgacure 651、Irgacure 784、Irgacure 819、Irgacure 1173、Irgacure 2202、Irgacure
At least one of 2959 and Chemcure-481.
In a preferred embodiment of the invention, the mask system is contact mask system, proximity mask
System, projection mask system or dynamic mask formula lithography system.
The yet another aspect of the present invention is as follows：
A method of control cholesteric liquid crystal grating orientation includes the following steps：
(1) one layer of light orientation material is uniformly coated on the conductive layer surface of two electrically-conductive backing plates；
(2) nematic liquid crystal for being heated to clearing point or more, chiral material, polymerized monomer, initiation are filled in liquid crystal cell
After the mixture of agent, natural cooling, above-mentioned nematic liquid crystal, chiral material, polymerized monomer, initiator mass ratio be 90~
99:1~3:0~7:0~1；
(3) it reheats above-mentioned liquid crystal cell to clearing point or more and keeps, while being 280- with by the wavelength of mask system
The linearly polarized light of 410nm is vertical or irradiates above-mentioned liquid crystal cell with certain inclination angle, controls light intensity and the time is exposed；
(4) after rotating different polarization angles, in the different zones of liquid crystal cell, above-mentioned (3) step is repeated several times；
(5) when polymerized monomer and initiator are not 0, after cooling is completed in exposure, alternating voltage is added on liquid crystal cell, is formed
Light-initiated rock-steady structure is used in combination in grating；When polymerized monomer and initiator are 0, then after exposing completion cooling, added on liquid crystal cell
Alternating voltage forms grating, without with ultraviolet light-initiated rock-steady structure.
In a preferred embodiment of the invention, the light orientation material is azo light orientation material SD1, SD2
Or SDA1；The nematic liquid crystal be E7, E48,5CB, MDA-00-3461, MDA-00-3506, ZLI 2293, ZLI 4788,
At least one of BL006, BLO36 and MLC 6608；The polymerized monomer be RM257, RM84, RM206, RM691, C6M,
At least one of BAHB and SLC1717；The chiral material be S811, R811, BDH1281, COC, R1011, R5011,
At least one of CB15, MLC6248 and BP-CD3；The initiator be Irgacure 127, Irgacure 184,
Irgacure 651、Irgacure 784、Irgacure 819、Irgacure 1173、Irgacure 2202、Irgacure
At least one of 2959 and Chemcure-481.
In a preferred embodiment of the invention, the mask system is contact mask system, proximity mask
System, projection mask system or dynamic mask formula lithography system.
The beneficial effects of the invention are as follows：The inventive process provides a kind of light of the cholesteric liquid crystal grating of convenient practicality
Method for alignment is controlled, prepared by the control that arbitrary graphic and differently- oriented directivity may be implemented, be not necessarily to mechanical registeration, considerably increase liquid crystal light
The flexibility and diversification that grid make, can further expand the application of liquid crystal grating in all respects.
Description of the drawings
Fig. 1 is the cross-sectional view of traditional liquid crystal grating device；
Fig. 2 is cholesteric liquid crystal grating schematic diagram；
Fig. 3 is the molecular structural formula schematic diagram of azo light orientation the material SD1 or SD2 used in the embodiment of the present invention；
Fig. 4 is the exposure schematic diagram of the embodiment of the present invention 1,3,5 and 6；
Fig. 5 is mask plate schematic diagram of the present invention；
Fig. 6 is that the embodiment of the present invention 1 and 6 expose schematic diagram again；
Fig. 7 is the result schematic diagram of the embodiment of the present invention 1,2,3,5 and 6；
Fig. 8 is that the embodiment of the present invention 2 exposes schematic diagram；
Fig. 9 is the molecular structural formula schematic diagram of light orientation material SDA1 used in the embodiment of the present invention 3；
Figure 10 is the exposure light path schematic diagram again of the embodiment of the present invention 3,5；
Figure 11 is 4 exposure light path schematic diagram of the embodiment of the present invention；
Figure 12 is 4 result schematic diagram of the embodiment of the present invention.
Specific implementation mode
Technical scheme of the present invention is further detailed and is described below by way of specific implementation mode combination attached drawing.
Embodiment 1：
The present embodiment is that face medium photoinduction and proximity mask method realize liquid crystal light orientation.
The ito glass for extracting 25mm × 20mm sizes, with ITO cleaning agents and deionized water (ratio 3:97) mixing is molten
Liquid be cleaned by ultrasonic 40 minutes, is then cleaned by ultrasonic 20 minutes with absolute ethyl alcohol again.It is placed 30 minutes in 120 DEG C of oven
Afterwards, it carries out UVO and cleans 30 minutes to increase wellability and adhesiveness.By organic solvent DMF (N, N-Dimethylformamide,
N,N dimethylformamide) solution is spin-coated on the surface of ito glass conductive layer, and wherein DMF solution is doped with azo light orientation
Material SD1 (molecular formula is as shown in Figure 3).Spin coating parameters are：Low speed spin coating 5 seconds, rotating speed 800n/min, high speed spin coating 40 seconds turn
Fast 3000n/min.After put in an oven with 120 DEG C dry 30 minutes.
Ito glass is placed on exposure light path, as shown in figure 4, laser 7 (405nm) launches laser light Glan-
Taylor's polarizing film 8, becomes line polarisation, and polarization direction is vertical direction, laser after beam-expanding collimation mirror 9 uniform irradiation in ITO
Glass 10, wherein 100 be the one side for being coated with SD1.(exposure dose 5J/cm is exposed respectively2), it is obtained in two on pieces uniform first
Begin to be orientated.With 90 degree of rotatory polarization pieces 8, the graphics template 11 as shown in Figure 5 to be exposed is selected, is positioned over close to ITO glass
The front of glass, as shown in fig. 6, exposure I TO glass again.
Wherein on the conductive layer of a piece of ito glass piece a diameter of 5 μm of even application space powder, then by two sheet glass
Piece composes liquid crystal cell (conductive layer is internal layer, pays attention to the coincidence of exposure area).By cholesteric liquid crystal (mixing of E7 and S811,
Ratio is 98:2) and liquid crystal cell is heated to 65 DEG C (61 DEG C of clearing points), pours into cholesteric liquid crystal.After liquid crystal is full of liquid crystal cell, close
Close heater box, natural cooling, liquid crystal molecule is by reorientation.
Conducting wire is affixed at liquid crystal cell both ends, in addition alternating voltage (square wave, 1KHz, peak-to-peak value 4.7V), in petrographic microscope
Lower observation can be seen and be orientated different liquid crystal gratings, as shown in Figure 7.
Embodiment 2：
With embodiment 1, the ito glass of identical size is extracted, after being cleaned and dried, will be spin-coated on mixed with the DMF solution of SD2
On ito glass conductive layer.It is placed again into oven and is dried with 120 DEG C.Then.Even application diameter in a sheets wherein
For 5 μm of space powder, two sheets is then composed into liquid crystal cell.
By cholesteric liquid crystal (mixing of 5CB and R811, ratio 98:2) it is put into oven with liquid crystal cell and is heated to 40 DEG C
(36 DEG C of clearing point), pours into liquid crystal.After liquid crystal full of after liquid crystal cell, heater box, natural cooling are closed.
The liquid crystal cell filled is placed in light path as described in Figure 8.Laser 7 (405nm) launches laser by polarization
Piece 8 becomes line polarisation, and it (can be DMD or LCD dynamic that beam-expanding collimation mirror 9 will be incident in dynamic mask system 15 after laser beam expanding
State mask system), at this point, all reachable liquid crystal cell 16 of the whole light of setting, warm table 17 ensure liquid crystal cell temperature during exposure
In 40 DEG C.(exposure dose 5J/cm after exposure2), so that only part light can be irradiated in by setting dynamic mask system
On liquid crystal cell, such as intermediate region, and 90 degree of rotatory polarization piece, (exposure dose 5J/cm is exposed again2)。
Conducting wire is affixed at liquid crystal cell both ends, in addition alternating voltage (square wave, 1KHz, peak-to-peak value 4.7V), in petrographic microscope
Lower observation can be seen and be orientated different liquid crystal gratings, and Fig. 7 is similar to.
Embodiment 3：
The present embodiment is that face medium light orientation and projection method realize that liquid crystal grating is orientated
With embodiment 1, after ito glass has been cleaned and dried, doped with SDA1, (azo dyes monomer, molecular formula is such as spin coating
Shown in Fig. 9) and initiator V-65 DMF solution.After spin coating is complete, two panels ito glass 10 is respectively placed in the light path of Fig. 4,
Carry out initial exposure (exposure dose 5J/cm2).Ito glass 10 is positioned in the light path such as Figure 10 again, is exposed again
(exposure dose 5J/cm2).Difference lies in collector lens group 18 and projection are added before and after the template 11 of Fig. 6 by Figure 10 and Fig. 6
Objective lens 20 form projection lithography system 21.
After the completion of exposure, two sheets is positioned in 150 DEG C of oven 1 hour so that it is anti-that thermal polymerization occurs for SDA1
It answers, and extra ingredient is removed.
With embodiment 1, box is made in the ito glass handled well, pours into cholesteric liquid crystal (mixing of E7 and S811, ratio
It is 98:2).Conducting wire is affixed at liquid crystal cell both ends, in addition alternating voltage (square wave, 1KHz, peak-to-peak value 4.7V), in petrographic microscope
Lower observation can see 1 identical liquid crystal grating of same embodiment, such as Fig. 7.
Embodiment 4：
With embodiment 1, the ito glass of identical size is extracted, after being cleaned and dried, will be spin-coated on mixed with the DMF solution of SD2
On ito glass conductive layer.It is placed again into oven and is dried with 120 DEG C.Then.Even application diameter in a sheets wherein
For 5 μm of space powder, two sheets is then composed into liquid crystal cell.
Liquid crystal cell is placed in the light path of Figure 11：Laser 7 (405nm) launches laser becomes polarization side through polarizing film 8
To the line polarisation of vertical direction, the laser through beam-expanding collimation mirror 9, the region that brightness uniformity is chosen using diaphragm 25 is passed through, and is irradiated
In column prism 26, become Line beam, liquid crystal cell 27 is tightly attached on turntable 28, rotation is turned around, and turntable speed is enclosed for 4-6
Per hour.
Liquid crystal cell after overexposure pours into cholesteric liquid crystal (ZLI 2293 on clearing point：CB15=98:2).It is cold
But it after, in addition after alternating voltage (square wave, 1KHz, peak-to-peak value 4.7V), is seen under petrographic microscope, it will obtain such as Figure 12
Grating.
Embodiment 5：
The present embodiment is that face medium light orientation and projection method realize liquid crystal grating orientation and polymer stabilizing
With embodiment 1, after ito glass cleaning, having dried, DMF solution of the spin coating doped with SD2.After spin coating is complete, by two
Piece ito glass 10 is respectively placed in the light path of Fig. 4, carries out initial exposure (exposure dose 5J/cm2).Again by ito glass 10
It is positioned in the light path such as Figure 10, carries out exposing (exposure dose 5J/cm again2).Difference lies in Fig. 6 by Figure 10 and Fig. 6
Template 11 it is front and back add collector lens group 18 and projection objective group 20, form projection lithography system 21.
By polymerizable cholesteric liquid crystal mixture, (E7, RM257, R811 and initiator Irgacure 819 are mixed, ratio
It is 93:4:2:1) and liquid crystal cell is heated to 65 DEG C (61 DEG C of clearing points), pours into polymerizable cholesteric liquid crystal.Liquid crystal is full of liquid crystal
After box, heater box is closed, natural cooling, liquid crystal molecule is by reorientation.
Conducting wire is affixed at liquid crystal cell both ends, in addition alternating voltage (square wave, 1KHz, peak-to-peak value 4.7V), in the ultraviolet of 365nm
Cause polymerization 5 minutes under light.After removing voltage, in polarized light microscopy microscopic observation, still it can be seen that being orientated different liquid crystal gratings, such as
Shown in Fig. 7.
Embodiment 6：
Liquid crystal cell is directly positioned over figure after liquid crystal cell is made in the ito glass for being coated with SD1 and having dried with embodiment 1
The position of 4ITO glass carries out initial exposure, then the liquid crystal box exposed is placed in the light path of Fig. 6.Exposure parameter is the same as implementation
Example 1.
By cholesteric liquid crystal (5CB:RM257:R811:819=9:7:2:1) and liquid crystal cell is heated to 40 DEG C of (clearing points 36
DEG C), pour into cholesteric liquid crystal.After liquid crystal is full of liquid crystal cell, heater box is closed, natural cooling, liquid crystal molecule is by reorientation.
Conducting wire is affixed at liquid crystal cell both ends, in addition alternating voltage (square wave, 1KHz, peak-to-peak value 4.7V), in the ultraviolet of 365nm
Cause polymerization 5 minutes under light, after removing voltage, in polarized light microscopy microscopic observation, can see and be orientated different liquid crystal gratings, such as
Shown in Fig. 7.
Embodiment 7：
This embodiment is the same manner as in Example 2, only pours into the liquid crystal in liquid crystal cell by 5CB:RM257:R811:819=9:
7:2:1 ratio mixes.After the completion of exposure, conducting wire is affixed at liquid crystal cell both ends, in addition alternating voltage (square wave, 1KHz,
4.7V), cause polymerization 5 minutes under the ultraviolet light of 365nm.After removing voltage, in polarized light microscopy microscopic observation, still it can be seen that taking
To different liquid crystal gratings, as shown in Figure 7.
Skilled person will appreciate that above-mentioned technical parameter when following ranges change, can also obtain and above-mentioned implementation
Example is close or identical technical effect：
The light orientation material is azo light orientation material SD1, SD2 or SDA1；The nematic liquid crystal be E7, E48,
At least one in 5CB, MDA-00-3461, MDA-00-3506, ZLI 2293, ZLI 4788, BL006, BLO36 and MLC6608
Kind；The polymerized monomer is at least one of RM257, RM84, RM206, RM691, C6M, BAHB and SLC1717；The hand
Property substance be at least one of S811, R811, BDH1281, COC, R1011, R5011, CB15, MLC6248 and BP-CD3；Institute
State initiator be Irgacure 127, Irgacure 184, Irgacure 651, Irgacure 784, Irgacure 819,
At least one of Irgacure 1173, Irgacure 2202, Irgacure 2959 and Chemcure-481.
Nematic liquid crystal, chiral material, polymerized monomer, initiator mass ratio be 90~99:1~3:0~7:0~1.
The mask system is contact mask system, proximity mask system, projection mask system or dynamic mask
Formula lithography system.
The foregoing is only a preferred embodiment of the present invention, therefore cannot limit the scope of implementation of the present invention according to this, i.e.,
According to equivalent changes and modifications made by the scope of the claims of the present invention and description, all should still belong in the range of the present invention covers.
Claims (5)
1. a kind of method of control cholesteric liquid crystal grating orientation, it is characterised in that：Include the following steps：
(1) one layer of light orientation material is uniformly coated on the conductive layer surface of two electrically-conductive backing plates；Light orientation material is azo light
Oriented material SD1, SD2 or SDA1；
(2) linearly polarized light for being 280-410nm with wavelength is vertical or irradiates electrically-conductive backing plate by mask system with certain inclination angle
It is coated with the conductive layer surface of light orientation material, light intensity is controlled and the time is exposed；
(3) after rotating different polarization angles, in the different zones of electrically-conductive backing plate, above-mentioned (2) step is repeated several times；
(4) after liquid crystal cell being made in the two electrically-conductive backing plates alignment after exposure, it is heated to clearing point or more, then fill and be equally heated to
The mixture of more than clearing point nematic liquid crystal, chiral material, polymerized monomer, initiator, natural cooling make liquid crystal molecule weight
It is new to be orientated, above-mentioned nematic liquid crystal, chiral material, polymerized monomer, initiator mass ratio be 90~99: 1~3: 0~7: 0~
1；Nematic liquid crystal be E7, E48,5CB, MDA-00-3461, MDA-00-3506, ZLI 2293, ZLI 4788, BL006,
At least one of BLO36 and MLC 6608；Polymerized monomer be RM257, RM84, RM206, RM691, C6M, BAHB and
At least one of SLC1717；Chiral material is S811, R811, BDH1281, COC, R1011, R5011, CB15, MLC6248
At least one of with BP-CD3；Initiator is Irgacure 127, Irgacure 184, Irgacure 651, Irgacure
784, in Irgacure 819, Irgacure 1173, Irgacure 2202, Irgacure 2959 and Chemcure-481
It is at least one；
(5) when polymerized monomer and initiator are not 0, alternating voltage is added on liquid crystal cell after the cooling period, grating is formed, purple is used in combination
Outer light-initiated rock-steady structure；When polymerized monomer and initiator are 0, then alternating voltage is added on liquid crystal cell after the cooling period, formed
Grating, without with ultraviolet light-initiated rock-steady structure.
2. a kind of method of control cholesteric liquid crystal grating orientation as described in claim 1, it is characterised in that：The mask
System is contact mask system, proximity mask system, projection mask system or dynamic mask formula lithography system.
3. a kind of method of control cholesteric liquid crystal grating orientation, it is characterised in that：Include the following steps：
(1) one layer of light orientation material is uniformly coated on the conductive layer surface of two electrically-conductive backing plates；Light orientation material is azo light
Oriented material SD1, SD2 or SDA1；
(2) liquid crystal cell is made in above-mentioned two electrically-conductive backing plate, the linearly polarized light for being 280-410nm with wavelength is vertical or centainly to tilt
Above-mentioned liquid crystal cell is irradiated at angle, controls light intensity and the time is exposed；
(3) after rotating different polarization angles, in the different zones of liquid crystal cell, above-mentioned (2) step is repeated several times；
(4) nematic liquid crystal that is heated to clearing point or more, chiral material, polymerized monomer, initiator are filled in liquid crystal cell
After mixture, natural cooling, above-mentioned nematic liquid crystal, chiral material, polymerized monomer, initiator mass ratio be 90~99: 1~
3: 0~7: 0~1；Nematic liquid crystal be E7, E48,5CB, MDA-00-3461, MDA-00-3506, ZLI 2293, ZLI 4788,
At least one of BL006, BLO36 and MLC 6608；Polymerized monomer be RM257, RM84, RM206, RM691, C6M, BAHB and
At least one of SLC1717；Chiral material is S811, R811, BDH1281, COC, R1011, R5011, CB15, MLC6248
At least one of with BP-CD3；Initiator is Irgacure 127, Irgacure 184, Irgacure 651, Irgacure
784, in Irgacure 819, Irgacure 1173, Irgacure 2202, Irgacure 2959 and Chemcure-481
It is at least one；
(5) when polymerized monomer and initiator are not 0, alternating voltage is added on liquid crystal cell after the cooling period, grating is formed, purple is used in combination
Outer light-initiated rock-steady structure；When polymerized monomer and initiator are 0, then alternating voltage is added on liquid crystal cell after the cooling period, formed
Grating, without with ultraviolet light-initiated rock-steady structure.
4. a kind of method of control cholesteric liquid crystal grating orientation, it is characterised in that：Include the following steps：
(1) one layer of light orientation material is uniformly coated on the conductive layer surface of two electrically-conductive backing plates；Light orientation material is azo light
Oriented material SD1, SD2 or SDA1；
(2) nematic liquid crystal that is heated to clearing point or more, chiral material, polymerized monomer, initiator are filled in liquid crystal cell
After mixture, natural cooling, above-mentioned nematic liquid crystal, chiral material, polymerized monomer, initiator mass ratio be 90~99: 1~
3: 0~7: 0~1；Nematic liquid crystal be E7, E48,5CB, MDA-00-3461, MDA-00-3506, ZLI 2293, ZLI 4788,
At least one of BL006, BLO36 and MLC 6608；Polymerized monomer be RM257, RM84, RM206, RM691, C6M, BAHB and
At least one of SLC1717；Chiral material is S811, R811, BDH1281, COC, R1011, R5011, CB15, MLC6248
At least one of with BP-CD3；Initiator is Irgacure 127, Irgacure 184, Irgacure 651, Irgacure
784, in Irgacure 819, Irgacure 1173, Irgacure 2202, Irgacure 2959 and Chemcure-481
It is at least one
(3) it reheats above-mentioned liquid crystal cell to clearing point or more and keeps, while being 280-410nm with by the wavelength of mask system
Linearly polarized light it is vertical or above-mentioned liquid crystal cell is irradiated with certain inclination angle, control light intensity and the time be exposed；
(4) after rotating different polarization angles, in the different zones of liquid crystal cell, above-mentioned (3) step is repeated several times；
(5) when polymerized monomer and initiator are not 0, after cooling is completed in exposure, alternating voltage is added on liquid crystal cell, forms light
Light-initiated rock-steady structure is used in combination in grid；When polymerized monomer and initiator are 0, then after exposing completion cooling, plus friendship on liquid crystal cell
Galvanic electricity pressure forms grating, without with ultraviolet light-initiated rock-steady structure.
5. a kind of method of control cholesteric liquid crystal grating orientation as claimed in claim 4, it is characterised in that：The mask
System is contact mask system, proximity mask system, projection mask system or dynamic mask formula lithography system.
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| CN108020972B (en) * | 2016-11-03 | 2020-06-30 | 北京石墨烯研究院有限公司 | Preparation method of liquid crystal film based on PET/graphene flexible base material as liquid crystal conducting layer and orientation layer |
| CN108020961B (en) * | 2016-11-03 | 2020-06-30 | 北京石墨烯研究院有限公司 | Method for inducing large-area orientation of cholesteric liquid crystal and realizing wide viewing angle of cholesteric liquid crystal by graphene film |
| CN107193160A (en) * | 2017-07-28 | 2017-09-22 | 广西天山电子股份有限公司 | A kind of cholesteric liquid crystal device, preparation method and beam control system |
| CN110412808A (en) * | 2019-07-25 | 2019-11-05 | 苏州晶萃光学科技有限公司 | A kind of light beam deflector part, preparation method and light beam deviation detection device |
| CN114167606B (en) * | 2020-09-11 | 2023-11-10 | 宁波舜宇光电信息有限公司 | Optical waveguide assembly and display apparatus including the same |
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