CN104777675A - Method of controlling orientation of cholesteric liquid crystal raster - Google Patents
Method of controlling orientation of cholesteric liquid crystal raster Download PDFInfo
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- CN104777675A CN104777675A CN201510211664.7A CN201510211664A CN104777675A CN 104777675 A CN104777675 A CN 104777675A CN 201510211664 A CN201510211664 A CN 201510211664A CN 104777675 A CN104777675 A CN 104777675A
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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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- Nonlinear Science (AREA)
- Spectroscopy & Molecular Physics (AREA)
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- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Liquid Crystal (AREA)
- Polarising Elements (AREA)
Abstract
The invention discloses a method of controlling the orientation of a cholesteric liquid crystal raster. The method comprises the following steps: (1) coating photo-alignment materials on the surfaces of conductive layers of conductive substrates; (2) illuminating the surfaces, coated with the photo-alignment materials, of the conductive layers of the conductive substrates through a mask system by linear polarized light, so as to expose; (3) repeating the step (2) for multiple times in different areas of the conductive substrates after different polarization angles are rotated; (4) heating a liquid crystal box made by two exposed conductive substrates in an alignment way to above a clearing point, and then filling a mixture of a nematic phase liquid crystal, a chiral material, a polymeric monomer and an initiator which are heated to above the clearing point, and naturally cooling to enable liquid crystal molecules to re-orientate; (5) adding AC (Alternating Current) voltage to the cooled liquid crystal box to form the raster. According to the method provided by the invention, the control and preparation of any graph and any direction of orientation can be realized without mechanical alignment, and the flexibility and diversity of the production of the liquid crystal raster can be greatly improved.
Description
Technical field
The invention belongs to liquid crystal grating technical field, be specifically related to a kind of method controlling cholesteric liquid crystal grating orientation.
Background technology
In the research or application of liquid crystal, how to allow the arrangement of ordered liquid crystal molecule be very important committed step, be commonly referred to as LCD alignment.The most general LCD alignment method coats the film that substrate surface is formed for alignment materials, recycling friction mode makes the long key molecule of orientation film produce directive arrangement, adsorbs orientation film and produce orderly Liquid Crystal Molecules Alignment by intermolecular force when liquid crystal molecule.Finally realize the effect of LCD alignment.The orientation ability that friction matching method can provide liquid crystal molecule stronger, but in the process of friction, due to the friction of flannelette contact, the pollution of electrostatic, scuffing, dust can be produced, and these pollute the damage often directly causing liquid crystal cell, product yield is caused to decline.
Though be therefore academia or industry all in the orientation mode that continuous Improvement is contactless, except the pollution of electrostatic and particle can be avoided, also can be easier to the orientation mode controlling liquid crystal molecule.What be wherein most widely used is light orientation.
Up to now, the multiple orientation mechanism such as existing light decomposition method, photoisomerization method, photodimerization method, optical cross-linking method.Compared with rubbing manipulation, light orientation method has as inferior advantage: do not produce electrostatic and dust; Can effectively control as parameters such as major axes orientation, pitch angle and anchoring energies; In addition, light alignment technique makes liquid crystal can apply in telecommunications and organic electronic, and these are still very debatable for friction techniques.
Liquid crystal grating has compared with traditional mechanical devices that volume is little, driving voltage is low, power consumption is little, resolution is high, diffraction characteristic changes the various advantages such as convenient, can be widely used for the every field such as diffraction optics, spectral measurement, beam deflection control, optical information processing, optical oomputing, optical communication field.
The basic device architecture of traditional liquid crystal grating is as shown in Figure 1: between top glass substrate 6 and lower glass substrate 1, be filled with the nematic liquid crystal 4 with dielectric constant anisotropy, forms liquid crystal cell.Lower glass substrate 1 is shaped with transparent addressing electrode 2 and liquid crystal orientation film 3a, top glass substrate 6 is shaped with transparent ground-electrode 5 and liquid crystal orientation film 3b.
Cholesteric liquid crystal can be allocated by nematic liquid crystal and chiral material and form, and adds acquisition stabilization by polymerization single polymerization monomer and initiating agent.Cholesteric liquid crystal grating is the phase grating based on cholesteric liquid crystal periodic arrangement planar, due to its application prospect on beam modulation device, is also one of focus of research in recent years.Depend on that the thickness of liquid crystal cell and the pitch ratio of cholesteric liquid crystal also have the oriented of matrix, as Fig. 2 according to the stripe direction of non-patent literature cholesteric liquid crystal grating.The direction of middle layer liquid crystal molecule determines face, direction, and then determines stripe direction.If this just means the orientation changing middle layer liquid crystal molecule before striped is formed, and the stripe direction forming grating again can be changed.
Summary of the invention
The object of the present invention is to provide a kind of method controlling cholesteric liquid crystal grating orientation.
Concrete technical scheme of the present invention is as follows:
Control a method for cholesteric liquid crystal grating orientation, comprise the steps:
(1) on the conductive layer surface of two electrically-conductive backing plates, one deck light oriented material is evenly applied;
(2) vertically or with certain pitch angle irradiate by mask system the conductive layer surface that electrically-conductive backing plate scribbles light oriented material with the linearly polarized light that wavelength is 280-410nm, control light intensity and time expose;
(3) after rotating different polarization angles, in the zones of different of electrically-conductive backing plate, above-mentioned (2) step is repeatedly repeated.
(4) after two electrically-conductive backing plates alignings after exposure being made liquid crystal cell, be heated to more than cleaning point, fill again be heated to more than cleaning point equally nematic liquid crystal, chiral material, polymerization single polymerization monomer, initiating agent potpourri, naturally cool, make liquid crystal molecule reorientation, the mass ratio of above-mentioned nematic liquid crystal, chiral material, polymerization single polymerization monomer, initiating agent is 90 ~ 99:1 ~ 3:0 ~ 7:0 ~ 1;
(5) when polymerization single polymerization monomer and initiating agent are not 0, liquid crystal cell after the cooling period adds alternating voltage, form grating, and cause rock-steady structure with ultraviolet light; When polymerization single polymerization monomer and initiating agent are 0, then liquid crystal cell after the cooling period adds alternating voltage, form grating, and do not need to cause rock-steady structure with ultraviolet light.
In a preferred embodiment of the invention, described smooth oriented material is azo light oriented material SD1, SD2 or SDA1; Described nematic liquid crystal is at least one in E7, E48,5CB, MDA-00-3461, MDA-00-3506, ZLI 2293, ZLI 4788, BL006, BLO36 and MLC 6608; Described polymerization single polymerization monomer is at least one in RM257, RM84, RM206, RM691, C6M, BAHB and SLC1717; Described chiral material is at least one in S811, R811, BDH1281, COC, R1011, R5011, CB15, MLC6248 and BP-CD3; Described initiating agent is at least one in Irgacure 127, Irgacure 184, Irgacure 651, Irgacure 784, Irgacure 819, Irgacure 1173, Irgacure 2202, Irgacure 2959 and Chemcure-481.
In a preferred embodiment of the invention, described mask system is contact mask system, proximity mask system, projection mask system or dynamic mask formula etching system.
Another technical scheme of the present invention is as follows:
Control a method for cholesteric liquid crystal grating orientation, it is characterized in that: comprise the steps:
(1) on the conductive layer surface of two electrically-conductive backing plates, one deck light oriented material is evenly applied;
(2) above-mentioned two electrically-conductive backing plates being made liquid crystal cell, is that the linearly polarized light of 280-410nm is vertical or irradiate above-mentioned liquid crystal cell with certain pitch angle with wavelength, controls light intensity and the time exposes;
(3) after rotating different polarization angles, in the zones of different of liquid crystal cell, above-mentioned (2) step is repeatedly repeated.
(4) fill in liquid crystal cell be heated to more than cleaning point nematic liquid crystal, chiral material, polymerization single polymerization monomer, initiating agent potpourri after, naturally cool, the mass ratio of above-mentioned nematic liquid crystal, chiral material, polymerization single polymerization monomer, initiating agent is 90 ~ 99:1 ~ 3:0 ~ 7:0 ~ 1;
(5) when polymerization single polymerization monomer and initiating agent are not 0, liquid crystal cell after the cooling period adds alternating voltage, form grating, and cause rock-steady structure with ultraviolet light; When polymerization single polymerization monomer and initiating agent are 0, then liquid crystal cell after the cooling period adds alternating voltage, form grating, and do not need to cause rock-steady structure with ultraviolet light.
In a preferred embodiment of the invention, described smooth oriented material is azo light oriented material SD1, SD2 or SDA1; Described nematic liquid crystal is at least one in E7, E48,5CB, MDA-00-3461, MDA-00-3506, ZLI 2293, ZLI 4788, BL006, BLO36 and MLC 6608; Described polymerization single polymerization monomer is at least one in RM257, RM84, RM206, RM691, C6M, BAHB and SLC1717; Described chiral material is at least one in S811, R811, BDH1281, COC, R1011, R5011, CB15, MLC6248 and BP-CD3; Described initiating agent is at least one in Irgacure 127, Irgacure 184, Irgacure 651, Irgacure 784, Irgacure 819, Irgacure 1173, Irgacure 2202, Irgacure 2959 and Chemcure-481.
In a preferred embodiment of the invention, described mask system is contact mask system, proximity mask system, projection mask system or dynamic mask formula etching system.
A technical scheme more of the present invention is as follows:
Control a method for cholesteric liquid crystal grating orientation, comprise the steps:
(1) on the conductive layer surface of two electrically-conductive backing plates, one deck light oriented material is evenly applied;
(2) fill in liquid crystal cell be heated to more than cleaning point nematic liquid crystal, chiral material, polymerization single polymerization monomer, initiating agent potpourri after, naturally cool, the mass ratio of above-mentioned nematic liquid crystal, chiral material, polymerization single polymerization monomer, initiating agent is 90 ~ 99:1 ~ 3:0 ~ 7:0 ~ 1;
(3) heat more than above-mentioned liquid crystal cell to cleaning point again and keep, be that the linearly polarized light of 280-410nm is vertical or irradiate above-mentioned liquid crystal cell with certain pitch angle with the wavelength through mask system simultaneously, controls light intensity and the time exposes;
(4) after rotating different polarization angles, in the zones of different of liquid crystal cell, above-mentioned (3) step is repeatedly repeated;
(5) when polymerization single polymerization monomer and initiating agent are not 0, after having exposed cooling, liquid crystal cell adds alternating voltage, form grating, and use light-initiated rock-steady structure; When polymerization single polymerization monomer and initiating agent are 0, then, after having exposed cooling, liquid crystal cell adds alternating voltage, forms grating, and do not need to cause rock-steady structure with ultraviolet light.
In a preferred embodiment of the invention, described smooth oriented material is azo light oriented material SD1, SD2 or SDA1; Described nematic liquid crystal is at least one in E7, E48,5CB, MDA-00-3461, MDA-00-3506, ZLI 2293, ZLI 4788, BL006, BLO36 and MLC 6608; Described polymerization single polymerization monomer is at least one in RM257, RM84, RM206, RM691, C6M, BAHB and SLC1717; Described chiral material is at least one in S811, R811, BDH1281, COC, R1011, R5011, CB15, MLC6248 and BP-CD3; Described initiating agent is at least one in Irgacure 127, Irgacure 184, Irgacure 651, Irgacure 784, Irgacure 819, Irgacure 1173, Irgacure 2202, Irgacure 2959 and Chemcure-481.
In a preferred embodiment of the invention, described mask system is contact mask system, proximity mask system, projection mask system or dynamic mask formula etching system.
The invention has the beneficial effects as follows: a kind of photo orientated method that The inventive process provides cholesteric liquid crystal grating of convenient practicality, the control preparation of arbitrary graphic and direction of orientation can be realized, without the need to mechanical registeration, considerably increase dirigibility and the variation of liquid crystal grating making, liquid crystal grating application in every respect can be expanded further.
Accompanying drawing explanation
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 embodiment of the present invention azo light oriented material SD1 or SD2 used;
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 be 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;
The molecular structural formula schematic diagram of the light oriented material SDA1 that Fig. 9 uses for the embodiment of the present invention 3;
Figure 10 is the schematic diagram of exposure light path again of the embodiment of the present invention 3,5;
Figure 11 is the embodiment of the present invention 4 exposure light path schematic diagram;
Figure 12 is the embodiment of the present invention 4 result schematic diagram.
Embodiment
By reference to the accompanying drawings below by way of embodiment technical scheme of the present invention is further detailed and is described.
Embodiment 1:
The present embodiment is that face medium photoinduction and proximity mask method realize liquid crystal light orientation.
Extract the ito glass of 25mm × 20mm size, carry out ultrasonic cleaning 40 minutes with the mixed solution of ITO clean-out system and deionized water (ratio is 3:97), and then with absolute ethyl alcohol ultrasonic cleaning 20 minutes.Place after 30 minutes in the baking box of 120 DEG C, carry out UVO and clean 30 minutes to increase wellability and adhesiveness.Be spin-coated on the surface of ito glass conductive layer by organic solvent DMF (N, N-Dimethylformamide, DMF) solution, wherein DMF solute doping has azo light oriented material SD1 (molecular formula as shown in Figure 3).Spin coating parameters is: low speed spin coating 5 seconds, rotating speed 800n/min, high speed spin coating 40 seconds, rotating speed 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 instrument 7 (405nm) launches laser light Glan-Taylor's polaroid 8, become line polarisation, polarization direction is vertical direction, uniform irradiation is in ito glass 10 after beam-expanding collimation mirror 9 for laser, and wherein 100 for scribbling the one side of SD1.(exposure dose is 5J/cm in exposure respectively
2), two panels obtains uniform initial orientation.With 90 degree of rotatory polarization sheets 8, select the graphics template 11 as shown in Figure 5 that will expose, be positioned over the front being close to ito glass, as shown in Figure 6, exposure I TO glass again.
On the conductive layer of a slice ito glass sheet wherein, even application diameter is the space powder of 5 μm, then two sheets is composed liquid crystal cell (conductive layer is internal layer, notes the coincidence of exposure area).Cholesteric liquid crystal (mixing of E7 and S811, ratio is 98:2) and liquid crystal cell are heated to 65 DEG C (cleaning points 61 DEG C), pour into cholesteric liquid crystal.After liquid crystal is full of liquid crystal cell, close heating cabinet, naturally cool, liquid crystal molecule is by reorientation.
Affix wire at liquid crystal cell two ends, add alternating voltage (square wave, 1KHz, peak-to-peak value 4.7V), at polarized light microscopy Microscopic observation, just can see the liquid crystal grating that orientation is different, as shown in Figure 7.
Embodiment 2:
With embodiment 1, extract the ito glass of same size, after cleaning-drying is complete, the DMF solution being mixed with SD2 is spin-coated on ito glass conductive layer.Again put into baking box with 120 DEG C of oven dry.Then.In a sheets, even application diameter is the space powder of 5 μm wherein, then two sheets is composed liquid crystal cell.
Cholesteric liquid crystal (mixing of 5CB and R811, ratio is 98:2) and liquid crystal cell are put into baking box be heated to 40 DEG C (cleaning points 36 DEG C), pour into liquid crystal.Be full of after liquid crystal cell until liquid crystal, close heating cabinet, naturally cool.
The liquid crystal cell of having filled with is placed in light path as described in Figure 8.Laser instrument 7 (405nm) launches laser becomes line polarisation through polaroid 8, beam-expanding collimation mirror 9 will be incident to (can be DMD or LCD dynamic mask system) in dynamic mask system 15 after laser beam expanding, now, set whole light and all can arrive liquid crystal cell 16, warm table 17 guarantees that liquid crystal cell temperature between exposure period is in 40 DEG C.After exposure, (exposure dose is 5J/cm
2), make to only have part light can irradiate on liquid crystal cell by setting dynamic mask system, as zone line, and rotatory polarization sheet 90 degree, (exposure dose is 5J/cm in exposure again
2).
Affix wire at liquid crystal cell two ends, add alternating voltage (square wave, 1KHz, peak-to-peak value 4.7V), at polarized light microscopy Microscopic observation, just can see the liquid crystal grating that orientation is different, be similar to Fig. 7.
Embodiment 3:
The present embodiment is that face medium light orientation and projection method realize liquid crystal grating orientation
With embodiment 1, after complete for ito glass cleaning-drying, spin coating is doped with the DMF solution of SDA1 (azo dyes monomer, molecular formula as shown in Figure 9) and initiating agent V-65.After spin coating is complete, be positioned over respectively in the light path of Fig. 4 by two panels ito glass 10, (exposure dose is 5J/cm to carry out initial exposure
2).Again ito glass 10 is positioned in the light path as Figure 10, again exposes that (exposure dose is 5J/cm
2).The difference of Figure 10 and Fig. 6 is to add collector lens group 18 and projection objective group 20 before and after the template 11 of Fig. 6, composition projection lithography system 21.
After having exposed, two sheets to be positioned in the baking box of 150 DEG C 1 hour, to make SDA1 that heat polymerization occur, and unnecessary composition is removed.
With embodiment 1, the ito glass handled well is made box, pour into cholesteric liquid crystal (mixing of E7 and S811, ratio is 98:2).Affix wire at liquid crystal cell two ends, add alternating voltage (square wave, 1KHz, peak-to-peak value 4.7V), at polarized light microscopy Microscopic observation, just can see the liquid crystal grating that same embodiment 1 is identical, as Fig. 7.
Embodiment 4:
With embodiment 1, extract the ito glass of same size, after cleaning-drying is complete, the DMF solution being mixed with SD2 is spin-coated on ito glass conductive layer.Again put into baking box with 120 DEG C of oven dry.Then.In a sheets, even application diameter is the space powder of 5 μm wherein, then two sheets is composed liquid crystal cell.
Liquid crystal cell is placed in the light path of Figure 11: laser instrument 7 (405nm) launches laser becomes polarization direction vertical direction line polarisation through polaroid 8, through the laser of beam-expanding collimation mirror 9, the region utilizing diaphragm 25 to choose brightness uniformity is passed through, irradiate in column prism 26, become Line beam, be close on universal stage 28 by liquid crystal cell 27, revolve and turn around, universal stage speed is that 4-6 circle is per hour.
On cleaning point, cholesteric liquid crystal (ZLI 2293:CB15=98:2) is poured into through the liquid crystal cell after overexposure.After cooling, after adding alternating voltage (square wave, 1KHz, peak-to-peak value 4.7V), see under polarizing microscope, the grating as Figure 12 will be obtained.
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, ito glass is cleaned, dry complete after, spin coating is doped with the DMF solution of SD2.After spin coating is complete, be positioned over respectively in the light path of Fig. 4 by two panels ito glass 10, (exposure dose is 5J/cm to carry out initial exposure
2).Again ito glass 10 is positioned in the light path as Figure 10, again exposes that (exposure dose is 5J/cm
2).The difference of Figure 10 and Fig. 6 is to add collector lens group 18 and projection objective group 20 before and after the template 11 of Fig. 6, composition projection lithography system 21.
Polymerisable cholesteric liquid crystal potpourri (E7, RM257, R811 and initiating agent Irgacure 819 mix, and ratio is 93:4:2:1) and liquid crystal cell are heated to 65 DEG C (cleaning points 61 DEG C), pour into polymerisable cholesteric liquid crystal.After liquid crystal is full of liquid crystal cell, close heating cabinet, naturally cool, liquid crystal molecule is by reorientation.
Affix wire at liquid crystal cell two ends, add alternating voltage (square wave, 1KHz, peak-to-peak value 4.7V), initiated polymerization 5 minutes under the ultraviolet light of 365nm.After removing voltage, at polarized light microscopy Microscopic observation, the liquid crystal grating that orientation is different still can be seen, as shown in Figure 7.
Embodiment 6:
With embodiment 1, SD1 will be scribbled and after dry complete ito glass makes liquid crystal cell, initial exposure is carried out in the position directly liquid crystal cell being positioned over Fig. 4 ito glass, then the liquid crystal box exposed is placed in the light path of Fig. 6.Exposure parameter is with embodiment 1.
Cholesteric liquid crystal (5CB:RM257:R811:819=9:7:2:1) and liquid crystal cell are heated to 40 DEG C (cleaning points 36 DEG C), pour into cholesteric liquid crystal.After liquid crystal is full of liquid crystal cell, close heating cabinet, naturally cool, liquid crystal molecule is by reorientation.
Affix wire at liquid crystal cell two ends, add alternating voltage (square wave, 1KHz, peak-to-peak value 4.7V), initiated polymerization 5 minutes under the ultraviolet light of 365nm, after removing voltage, at polarized light microscopy Microscopic observation, the liquid crystal grating that orientation is different just can be seen, as shown in Figure 7.
Embodiment 7:
This embodiment is the same manner as in Example 2, and the liquid crystal just poured in liquid crystal cell mixes in 5CB:RM257:R811:819=9:7:2:1 ratio.After having exposed, affix wire at liquid crystal cell two ends, add alternating voltage (square wave, 1KHz, 4.7V), initiated polymerization 5 minutes under the ultraviolet light of 365nm.After removing voltage, at polarized light microscopy Microscopic observation, the liquid crystal grating that orientation is different still can be seen, as shown in Figure 7.
Those skilled in the art are known, and above-mentioned technical parameter, when following ranges changes, also can obtain the technical effect close or identical with above-described embodiment:
Described smooth oriented material is azo light oriented material SD1, SD2 or SDA1; Described nematic liquid crystal is at least one in E7, E48,5CB, MDA-00-3461, MDA-00-3506, ZLI 2293, ZLI 4788, BL006, BLO36 and MLC6608; Described polymerization single polymerization monomer is at least one in RM257, RM84, RM206, RM691, C6M, BAHB and SLC1717; Described chiral material is at least one in S811, R811, BDH1281, COC, R1011, R5011, CB15, MLC6248 and BP-CD3; Described initiating agent is at least one in Irgacure 127, Irgacure 184, Irgacure 651, Irgacure 784, Irgacure 819, Irgacure 1173, Irgacure 2202, Irgacure 2959 and Chemcure-481.
The mass ratio of nematic liquid crystal, chiral material, polymerization single polymerization monomer, initiating agent is 90 ~ 99:1 ~ 3:0 ~ 7:0 ~ 1.
Described mask system is contact mask system, proximity mask system, projection mask system or dynamic mask formula etching system.
The above, be only preferred embodiment of the present invention, therefore can not limit scope of the invention process according to this, the equivalence change namely done according to the scope of the claims of the present invention and description with modify, all should still belong in scope that the present invention contains.
Claims (9)
1. control a method for cholesteric liquid crystal grating orientation, it is characterized in that: comprise the steps:
(1) on the conductive layer surface of two electrically-conductive backing plates, one deck light oriented material is evenly applied;
(2) vertically or with certain pitch angle irradiate by mask system the conductive layer surface that electrically-conductive backing plate scribbles light oriented material with the linearly polarized light that wavelength is 280-410nm, control light intensity and time expose;
(3) after rotating different polarization angles, in the zones of different of electrically-conductive backing plate, above-mentioned (2) step is repeatedly repeated;
(4) after two electrically-conductive backing plates alignings after exposure being made liquid crystal cell, be heated to more than cleaning point, fill again be heated to more than cleaning point equally nematic liquid crystal, chiral material, polymerization single polymerization monomer, initiating agent potpourri, naturally cool, make liquid crystal molecule reorientation, the mass ratio of above-mentioned nematic liquid crystal, chiral material, polymerization single polymerization monomer, initiating agent is 90 ~ 99:1 ~ 3:0 ~ 7:0 ~ 1;
(5) when polymerization single polymerization monomer and initiating agent are not 0, liquid crystal cell after the cooling period adds alternating voltage, form grating, and cause rock-steady structure with ultraviolet light; When polymerization single polymerization monomer and initiating agent are 0, then liquid crystal cell after the cooling period adds alternating voltage, form grating, and do not need to cause rock-steady structure with ultraviolet light.
2. a kind of method controlling cholesteric liquid crystal grating orientation as claimed in claim 1, is characterized in that: described smooth oriented material is azo light oriented material SD1, SD2 or SDA1; Described nematic liquid crystal is at least one in E7, E48,5CB, MDA-00-3461, MDA-00-3506, ZLI 2293, ZLI 4788, BL006, BLO36 and MLC 6608; Described polymerization single polymerization monomer is at least one in RM257, RM84, RM206, RM691, C6M, BAHB and SLC1717; Described chiral material is at least one in S811, R811, BDH1281, COC, R1011, R5011, CB15, MLC6248 and BP-CD3; Described initiating agent is at least one in Irgacure 127, Irgacure 184, Irgacure 651, Irgacure 784, Irgacure 819, Irgacure 1173, Irgacure 2202, Irgacure 2959 and Chemcure-481.
3. a kind of method controlling cholesteric liquid crystal grating orientation as claimed in claim 1, is characterized in that: described mask system is contact mask system, proximity mask system, projection mask system or dynamic mask formula etching system.
4. control a method for cholesteric liquid crystal grating orientation, it is characterized in that: comprise the steps:
(1) on the conductive layer surface of two electrically-conductive backing plates, one deck light oriented material is evenly applied;
(2) above-mentioned two electrically-conductive backing plates being made liquid crystal cell, is that the linearly polarized light of 280-410nm is vertical or irradiate above-mentioned liquid crystal cell with certain pitch angle with wavelength, controls light intensity and the time exposes;
(3) after rotating different polarization angles, in the zones of different of liquid crystal cell, above-mentioned (2) step is repeatedly repeated;
(4) fill in liquid crystal cell be heated to more than cleaning point nematic liquid crystal, chiral material, polymerization single polymerization monomer, initiating agent potpourri after, naturally cool, the mass ratio of above-mentioned nematic liquid crystal, chiral material, polymerization single polymerization monomer, initiating agent is 90 ~ 99:1 ~ 3:0 ~ 7:0 ~ 1;
(5) when polymerization single polymerization monomer and initiating agent are not 0, liquid crystal cell after the cooling period adds alternating voltage, form grating, and cause rock-steady structure with ultraviolet light; When polymerization single polymerization monomer and initiating agent are 0, then liquid crystal cell after the cooling period adds alternating voltage, form grating, and do not need to cause rock-steady structure with ultraviolet light.
5. a kind of method controlling cholesteric liquid crystal grating orientation as claimed in claim 4, is characterized in that: described smooth oriented material is azo light oriented material SD1, SD2 or SDA1; Described nematic liquid crystal is at least one in E7, E48,5CB, MDA-00-3461, MDA-00-3506, ZLI 2293, ZLI 4788, BL006, BLO36 and MLC 6608; Described polymerization single polymerization monomer is at least one in RM257, RM84, RM206, RM691, C6M, BAHB and SLC1717; Described chiral material is at least one in S811, R811, BDH1281, COC, R1011, R5011, CB15, MLC6248 and BP-CD3; Described initiating agent is at least one in Irgacure 127, Irgacure 184, Irgacure 651, Irgacure 784, Irgacure 819, Irgacure 1173, Irgacure 2202, Irgacure 2959 and Chemcure-481.
6. a kind of method controlling cholesteric liquid crystal grating orientation as claimed in claim 4, is characterized in that: described mask system is contact mask system, proximity mask system, projection mask system or dynamic mask formula etching system.
7. control a method for cholesteric liquid crystal grating orientation, it is characterized in that: comprise the steps:
(1) on the conductive layer surface of two electrically-conductive backing plates, one deck light oriented material is evenly applied;
(2) fill in liquid crystal cell be heated to more than cleaning point nematic liquid crystal, chiral material, polymerization single polymerization monomer, initiating agent potpourri after, naturally cool, the mass ratio of above-mentioned nematic liquid crystal, chiral material, polymerization single polymerization monomer, initiating agent is 90 ~ 99:1 ~ 3:0 ~ 7:0 ~ 1;
(3) heat more than above-mentioned liquid crystal cell to cleaning point again and keep, be that the linearly polarized light of 280-410nm is vertical or irradiate above-mentioned liquid crystal cell with certain pitch angle with the wavelength through mask system simultaneously, controls light intensity and the time exposes;
(4) after rotating different polarization angles, in the zones of different of liquid crystal cell, above-mentioned (3) step is repeatedly repeated;
(5) when polymerization single polymerization monomer and initiating agent are not 0, after having exposed cooling, liquid crystal cell adds alternating voltage, form grating, and use light-initiated rock-steady structure; When polymerization single polymerization monomer and initiating agent are 0, then, after having exposed cooling, liquid crystal cell adds alternating voltage, form grating, and do not need to cause rock-steady structure with ultraviolet light.
8. a kind of method controlling cholesteric liquid crystal grating orientation as claimed in claim 1, is characterized in that: described smooth oriented material is azo light oriented material SD1, SD2 or SDA1; Described nematic liquid crystal is at least one in E7, E48,5CB, MDA-00-3461, MDA-00-3506, ZLI 2293, ZLI 4788, BL006, BLO36 and MLC 6608; Described polymerization single polymerization monomer is at least one in RM257, RM84, RM206, RM691, C6M, BAHB and SLC1717; Described chiral material is at least one in S811, R811, BDH1281, COC, R1011, R5011, CB15, MLC6248 and BP-CD3; Described initiating agent is at least one in Irgacure 127, Irgacure 184, Irgacure 651, Irgacure 784, Irgacure 819, Irgacure 1173, Irgacure 2202, Irgacure 2959 and Chemcure-481.
9. a kind of method controlling cholesteric liquid crystal grating orientation as claimed in claim 1, is characterized in that: described mask system is contact mask system, proximity mask system, projection mask system or dynamic mask formula etching system.
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