CN115903313A - Large-aperture cascading mode control variable-focus liquid crystal lens system and method - Google Patents
Large-aperture cascading mode control variable-focus liquid crystal lens system and method Download PDFInfo
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- CN115903313A CN115903313A CN202211688212.4A CN202211688212A CN115903313A CN 115903313 A CN115903313 A CN 115903313A CN 202211688212 A CN202211688212 A CN 202211688212A CN 115903313 A CN115903313 A CN 115903313A
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Abstract
The invention discloses a large-aperture cascading mode control variable-focus liquid crystal lens system and a preparation method thereof. The invention discloses a piezoelectric film composite liquid crystal molecular orientation conversion film capable of realizing a flexible lens, which is prepared by a piezoelectric film control technology and a correlation technology for forming flexible lenses.
Description
Technical Field
The invention belongs to the field of electrically controlled variable focus lenses, and particularly relates to a large-aperture cascading mode control variable focus liquid crystal lens system.
Background
The zoom glasses can adjust the focal length of the lenses according to requirements, and a wearer can obtain images with different focal lengths under the condition that the glasses do not need to be replaced. There are various ways to implement variable focus glasses, in which the liquid crystal lens is a variable focus lens that uses an applied voltage to implement gradient refractive index distribution of a liquid crystal layer, thereby performing phase modulation on incident light. Compared with the traditional optical lens, the liquid crystal lens has the advantages of electric control adjustable focal length, no need of a mechanical moving device, small volume, low cost, easy integration and the like, and is widely applied.
For a high-resolution imaging system in military and civil application scenes, a liquid crystal lens system needs to break through multiple key technologies, realize large lens aperture and irrelevance of polarization, realize electric control continuous large-range focusing from a concave lens to a convex lens, have wide working waveband and cover visible light to near infrared. Under the requirement, the electrically controlled liquid crystal lens with a polarization independence and a large zooming range is invented.
Disclosure of Invention
The invention discloses a large-aperture cascading mode control variable-focus liquid crystal lens system and a preparation method thereof. The invention discloses a piezoelectric film composite liquid crystal molecular orientation conversion film capable of realizing a flexible lens, which is prepared by a piezoelectric film control technology and a correlation technology for forming flexible lenses.
The specific technical scheme of the invention is as follows:
the liquid crystal lens controlled by a mode is adopted to form gradient refractive index distribution, so that the function of a large-aperture lens is realized;
a double-layer liquid crystal lens structure is adopted, and a flexible composite liquid crystal molecular orientation conversion film is adopted in the middle, so that the polarization independence of a liquid crystal lens system is realized;
the laminated structure of the central electrode and the round hole type electrode is adopted, and the conversion of the liquid crystal lens with the same parallel orientation from a concave lens to a convex lens is realized under the appropriate driving condition through the switching of the electrodes;
the fast response liquid crystal material with low infrared absorption and high refractive index difference is matched for use, the working waveband covers the visible light to near infrared waveband, the working waveband of the liquid crystal lens is widened, the focal length adjusting range is enlarged, and the response speed of the liquid crystal lens is improved.
The large-aperture cascading mode control variable-focus liquid crystal lens system and the method have the following advantages:
the large-aperture cascading mode control variable-focus liquid crystal lens system can meet the required electric control zooming, can work in a wide spectrum band from visible light to near infrared, can realize large-aperture high-resolution focusing imaging, and can realize a polarization-independent flexible liquid crystal lens system with continuous large-range focusing from a convex lens to a concave lens.
Drawings
Fig. 1 is an initial state diagram of a large-aperture cascade mode control variable-focus liquid crystal lens system.
Fig. 2 is a state diagram of a convex lens of a large-aperture cascade mode control variable-focus liquid crystal lens system.
FIG. 3 is a state diagram of a concave lens of a large aperture cascade mode control variable focus liquid crystal lens system.
FIG. 4 is a schematic diagram of the operation of a liquid crystal lens with a stacked electrode structure.
Fig. 5 mode-controlled liquid crystal lens.
The symbols in the figure illustrate: 100. the large-aperture cascade mode controls the variable-focus liquid crystal lens system; 200. a mode-controlled liquid crystal lens; 201. an equivalent convex lens system; 202. an equivalent concave lens system; 1. a substrate glass; 2. a ring electrode; 3. a center electrode; 4. a common electrode; 5. a liquid crystal alignment layer; 6. a fast response liquid crystal of low absorption and high refractive index anisotropy (delta n) in infrared band; 7. a flexible piezoelectric film; 8. a liquid crystal molecular orientation conversion film; 9. a ZnO high-resistance layer; 10. a cured hybrid liquid crystal polymer; 11. a flexible piezoelectric thin film negative electrode; 12. a flexible piezoelectric film positive electrode; 13. a drive signal source; 14. the piezoelectric film is compounded with a liquid crystal molecular orientation conversion film; 15. an upper liquid crystal layer; 16. a lower liquid crystal layer; 17. a liquid crystal molecular orientation switching film.
Detailed Description
For a better understanding of the objects, structure and function of the present invention, a large aperture cascaded mode controlled variable focus liquid crystal lens system and method of the present invention will be described in further detail with reference to the accompanying drawings.
A large-aperture cascade mode control variable-focus liquid crystal lens system 100 mainly comprises:
the piezoelectric film is compounded with a liquid crystal molecular orientation conversion film 14 to realize a flexible lens;
the mode-controlled liquid crystal lens 200 realizes high-resolution imaging and large-range zooming technology;
a voltage control structure in which the central electrode 3 and the circular hole electrode 2 are laminated;
a fast response liquid crystal 6 of low absorption and high refractive index anisotropy (Δ n) in the infrared band;
the preparation of the piezoelectric film composite liquid crystal molecular orientation conversion film 14 mainly comprises the steps of preparing a flexible piezoelectric film 7, preparing a liquid crystal molecular orientation conversion film 8, and combining the flexible piezoelectric film 7 and the liquid crystal molecular orientation conversion film 8;
the preparation method and the steps for preparing the flexible piezoelectric film 7 are as follows:
mixing PMN-PT piezoelectric single crystal particles with 5mol/L AgNO in dark environment 3 Mixing the solution, stirring for 40-60 min to uniformly mix, irradiating by ultraviolet light for 30-50 min, continuously keeping the stirring state in the process, separating the prepared Ag @ PMN-PT heterojunction from the solution by using a centrifugal machine, washing for several times by using deionized water, drying in a nitrogen atmosphere, finally preparing Ag @ PMN-PT heterojunction particle powder, weighing a proper amount of PVDF-TrFE, dispersing in a DMF organic solvent, stirring and oscillating to uniformly disperse, and obtaining a PVDF-TrFE solution; dispersing Ag @ PMN-PT heterojunction in PVDF-TrFE solution, stirring and oscillating to disperse the phases uniformly to obtain the final productAg @ PMN-PT/PVDF-TrFE composite solution, doping a proper amount of copper nanorods as a conductive phase, stirring and oscillating to uniformly disperse to prepare copper nanorods/Ag @ PMN-PT/PVDF-TrFE flexible composite piezoelectric film precursor solution, coating the precursor solution on a casting plate, hot-pressing and drying in a nitrogen atmosphere to prepare a flexible composite piezoelectric film, sputtering ITO on two sides of the surface of the flexible composite piezoelectric film to serve as transparent electrodes respectively to prepare a film with electrodes on two sides, applying an alternating current electric field to the film after sputtering the electrodes for polarization, and taking out the film for cooling.
The liquid crystal molecular alignment switching film 8 is prepared as follows:
pouring the E7/RM257 mixture into an empty box with vertical orientation of upper and lower substrates, thickness of 20-100 μm and detachable upper and lower substrates, and placing the liquid crystal box under square wave voltage with intensity of 5mW/cm 2 To 15mW/cm 2 The ultraviolet light exposure is carried out for 40min to 80min, and finally the upper substrate and the lower substrate of the liquid crystal box are uncovered, so that the liquid crystal molecular orientation conversion film 8 with the thickness of 20 mu m to 50 mu m is obtained.
The combination of the flexible piezoelectric film 7 and the liquid crystal molecular orientation conversion film 8: the flexible piezoelectric film 7 is adhered to the upper surface of the liquid crystal molecular orientation conversion film 8 by using epoxy glue, and then a liquid crystal molecular orientation layer is spin-coated on the upper surface of the flexible piezoelectric film 7.
The packaging process flow of the mode-controlled liquid crystal lens 200 comprises the following steps:
the method comprises the following steps of (1) clinging a piezoelectric thin film composite liquid crystal molecular orientation conversion film 14 to a hard substrate, carrying out box sealing operation with an upper substrate provided with a central electrode 3 and a ring electrode 2, slightly uncovering the hard substrate after frame glue is completely cured to obtain an upper liquid crystal layer 15 empty box, carrying out box sealing operation on the upper liquid crystal layer 15 empty box and a lower substrate provided with a common electrode 4 to obtain a mode-controlled liquid crystal lens empty box 200 empty box embedded in the piezoelectric thin film composite liquid crystal molecular orientation conversion film 14, wherein in the process, the orientation direction of the upper liquid crystal layer 15 empty box is orthogonal to the orientation direction of the lower liquid crystal layer 16 empty box while the surface orientation of the upper and lower substrates is aligned with the surface orientation of the piezoelectric thin film composite liquid crystal molecular orientation conversion film 14, and finally filling fast response liquid crystal 6 with infrared waveband low absorption high refractive index anisotropy (delta n);
the preparation process of the laminated voltage control structure of the central electrode 3 and the circular hole electrode 2 is as follows:
a ZnO film is subjected to radio frequency magnetron sputtering on the substrate with the annular electrode 2 to serve as a high-resistance layer 9, and a central electrode 3 is prepared in the center of the annular electrode 2 by using a photoetching process and is led out;
the working principle of the voltage control structure liquid crystal lens with the laminated central electrode 3 and the circular hole electrode 2 is as follows:
the arrangement of liquid crystal molecules is changed by regulating and controlling an external electric field, and the wave front is modulated according to the formed electric potential distribution to form a convex lens and a concave lens. When the liquid crystal lens is in a non-voltage-applying state, the liquid crystal lens is in a non-focusing state; when the common electrode 4 and the annular electrode 2 are grounded, and the central electrode 3 is connected with a signal source, the central electric field of the circular hole is higher than the edge, liquid crystal molecules are induced to be vertical to the substrate in the center, and the original parallel orientation is maintained on the two sides to form a convex lens; when the common electrode 4 and the central electrode 3 are grounded and the annular electrode 2 is connected with a signal source, the central electric field of the circular hole is lower than the edge, the liquid crystal molecules are induced to maintain the original parallel orientation in the center and are perpendicular to the substrate at two sides to form a concave lens.
The preparation process of the fast response liquid crystal 6 with low absorption and high refractive index anisotropy (delta n) in the infrared band is as follows:
according to the selected biphenyl, NCS and diphenylacetylene liquid crystal molecular structures, a coupling reaction is firstly carried out, then a group sensitive to Pd (PPh 3) 4 is prepared, and an amino group is deprotected to prepare an NCS structural product.
A first embodiment of a method of manufacturing a large aperture cascaded mode controlled variable focus liquid crystal lens system 100:
1. the flexible piezoelectric film 7 is prepared by AgNO 3 Uses ethanol as solvent to prepare AgNO with the concentration of 3mol/L to 6mol/L 3 A solution;
2. mixing PMN-PT piezoelectric single crystal particles with AgNO in dark 3 Mixing the solutions, and stirring for 40-60 min to mix uniformly;
3. irradiating the mixed solution by ultraviolet light for 30min to 50min, and continuously keeping the stirring state in the process;
4. then separating the prepared Ag @ PMN-PT heterojunction by using a centrifugal machine, washing for several times by using deionized water, and drying in a nitrogen atmosphere to finally prepare Ag @ PMN-PT heterojunction particle powder;
5. weighing a proper amount of PVDF-TrFE, dispersing in a DMF organic solvent, stirring and oscillating to disperse uniformly to obtain a PVDF-TrFE solution;
6. dispersing the Ag @ PMN-PT heterojunction in the PVDF-TrFE solution, stirring and oscillating to uniformly disperse each phase, and preparing the Ag @ PMN-PT/PVDF-TrFE composite solution;
7. doping a proper amount of copper nanorods in the Ag @ PMN-PT/PVDF-TrFE composite solution as a conductive phase, stirring and oscillating to uniformly disperse, and preparing a precursor solution of the copper nanorods/Ag @ PMN-PT/PVDF-TrFE flexible composite piezoelectric film;
8. coating the precursor solution on a casting plate, hot-pressing, and drying in a nitrogen atmosphere to prepare an unpolarized flexible piezoelectric film;
9. respectively sputtering ITO (indium tin oxide) as transparent electrodes on two sides of the surface of the unpolarized flexible piezoelectric film to prepare a film with electrodes on two sides;
10. applying an alternating current electric field to the film with electrodes on two sides for polarization, adjusting the polarization temperature to 75-95 ℃, adjusting the frequency of the applied alternating current voltage to 3-7 Hz, the amplitude to 15-15 kV/cm and the cycle number to 12 circles of bipolar triangular waves, taking out the film for cooling, and finally preparing a transparent flexible piezoelectric film 7;
11. the preparation of the liquid crystal molecular orientation conversion film 8 is to mix RM257 (4- (3-acryloxypropoxy) benzoic acid 2-methyl-1, 4-phenyl ester), liquid crystal E7 and photoinitiator 184 (1-hydroxycyclohexyl phenyl ketone) in a proper proportion to prepare an E7/RM257 mixture;
12. pouring the E7/RM257 mixture into an empty box with the upper and lower substrates vertical to each other in orientation and with the thickness of 20-100 mu m, wherein the upper and lower substrates can be detached;
13. the liquid crystal box is arranged at the frequency of 800Hz to 1.5kHz and the amplitude ofUnder the square wave voltage of 18Vrms to 30Vrms, the intensity is 5mW/cm 2 To 15mW/cm 2 Exposing for 40min to 80min by ultraviolet light, and finally uncovering upper and lower substrates of a liquid crystal box to obtain a liquid crystal molecular orientation conversion film 8;
14. the laminated voltage control structure of the central electrode 3 and the circular hole electrode 2 is that a ZnO film is formed on a substrate with the annular electrode 2 by radio frequency magnetron sputtering to serve as a high-resistance layer 9, and the thickness of the ZnO film is 50nm to 300nm;
15. preparing a central electrode 3 at the center of the annular electrode 2 by using a photoetching process, and leading out to obtain a laminated voltage control structure of the central electrode 3 and the circular hole electrode 2;
16. sequentially ultrasonically cleaning the upper substrate with the voltage control structure formed by laminating the central electrode 3 and the circular hole electrode 2 and the lower substrate with the common electrode 4 for 15min by using liquid detergent, deionized water, acetone and absolute ethyl alcohol, and then drying;
17. spin-coating a Polyimide (PI) liquid crystal orientation agent layer on the lower surface of an upper substrate with a voltage control structure formed by laminating a central electrode 3 and a circular hole electrode 2 and the upper surface of a lower substrate with a common electrode 4 by adopting a spin coating process, wherein the thickness of the PI liquid crystal orientation agent layer is 50nm to 150nm;
18. performing mechanical friction treatment on the liquid crystal aligning agent layer to obtain a liquid crystal aligning layer 5;
19. the method comprises the following steps of (1) tightly attaching a piezoelectric thin film composite liquid crystal molecular orientation conversion film 14 to a hard substrate, carrying out box sealing operation with an upper substrate provided with a central electrode 3 and a ring electrode 2, slightly removing the hard substrate after frame glue is completely cured to obtain an empty box of an upper liquid crystal layer 15, wherein in the process, the surface orientation of the upper substrate needs to be aligned with the upper surface orientation of the piezoelectric thin film composite liquid crystal molecular orientation conversion film 14;
20. then, the empty box of the upper liquid crystal layer 15 and the lower substrate with the common electrode 4 are subjected to box sealing operation to obtain a large-aperture cascading mode control variable-focus liquid crystal lens system 100 empty box embedded into the piezoelectric thin film composite liquid crystal molecular orientation conversion film 14, and in the process, the surface orientation of the lower substrate needs to be aligned with the lower surface orientation of the piezoelectric thin film composite liquid crystal molecular orientation conversion film 14;
22. and (3) filling the infrared band low-absorption high-refractive index anisotropy (delta n) fast response liquid crystal 6 by using a capillary suction tube, and sealing to finally obtain the large-aperture cascading mode control variable-focus liquid crystal lens system.
Claims (6)
1. A large-aperture cascade mode control variable-focus liquid crystal lens system is characterized by comprising: the piezoelectric film is compounded with a liquid crystal molecular orientation conversion film (14) to realize a flexible lens; cascaded with mode-controlled liquid crystal lenses (200) to achieve high resolution imaging and wide-range zooming of-10D to 10D.
2. The large-aperture cascading mode-controlled variable-focus liquid crystal lens system as claimed in claim 1, further comprising a voltage control structure of a lamination of the central electrode (3) and the circular hole electrode (2); the fast response liquid crystal (6) with low absorption and high refractive index anisotropy (delta n) in an infrared band realizes a wide working band from visible light of 380nm to 1300nm to near infrared.
3. The large aperture cascade type mode-controlled variable focus liquid crystal lens system according to claim 1, wherein the piezoelectric thin film composite liquid crystal molecular orientation conversion film (14) is formed by combining a flexible piezoelectric thin film (7) with a liquid crystal molecular orientation conversion film (8), and is used for dividing an upper liquid crystal layer (15) and a lower liquid crystal layer (16) to make the liquid crystal molecules of the upper liquid crystal layer (15) and the lower liquid crystal layer (16) vertically oriented to each other, thereby realizing polarization independence on incident light; the two sides of the surface of the flexible piezoelectric film (7) are respectively provided with a flexible piezoelectric film positive electrode (12) and a flexible piezoelectric film negative electrode (11).
4. The large-aperture cascading mode control variable-focus liquid crystal lens system according to claim 3, wherein the piezoelectric thin film composite liquid crystal molecular orientation conversion film (14) stretches or contracts in shape through adjusting the polarity and the magnitude of voltage loaded on the flexible piezoelectric thin film positive electrode (12) and the flexible piezoelectric thin film negative electrode (11), so that the focal length of the flexible lens formed by the piezoelectric thin film composite liquid crystal molecular orientation conversion film (14) and liquid crystal molecules is changed; when the piezoelectric film composite liquid crystal molecule orientation conversion film (14) is controlled to be in a stretching state, a flexible concave lens is formed, orientation conversion of liquid crystal molecules (6) is maintained, and polarization independence of a large-aperture cascading mode control variable-focus liquid crystal lens system is achieved; when the piezoelectric film composite liquid crystal molecule orientation conversion film (14) is controlled to be in a shrinkage state, a flexible convex lens is formed, orientation conversion of liquid crystal molecules (6) is maintained, and polarization independence of a large-aperture cascading mode control variable-focus liquid crystal lens system is achieved.
5. The method for preparing the large-aperture cascading mode control variable-focus liquid crystal lens system as claimed in any one of claims 1 to 4, wherein the method comprises the step of preparing the piezoelectric thin film composite liquid crystal molecular orientation conversion film (14), and the method comprises the following steps:
coating the precursor solution of the flexible composite piezoelectric film on a casting plate, hot-pressing, drying in a nitrogen atmosphere to prepare a flexible piezoelectric film, and sputtering electrodes on two sides;
applying an alternating current electric field to the flexible piezoelectric film for polarization, and finally preparing a transparent flexible composite piezoelectric film material (7);
pouring a mixture of a liquid crystal material E7 and a polymer RM257 into a detachable empty box with vertical upper and lower substrate orientations, and exposing by using ultraviolet light to obtain a liquid crystal molecular orientation conversion film;
and adhering the flexible piezoelectric film (7) to the upper surface of the liquid crystal molecular orientation conversion film (8), and spin-coating a liquid crystal molecular orientation layer (5) on the upper surface of the flexible piezoelectric film to obtain the piezoelectric film composite liquid crystal molecular orientation conversion film (14).
6. The method of claim 5, further comprising the steps of:
preparing a high-resistance film on the lower surface of an upper substrate by adopting a method of radio frequency magnetron sputtering a zinc oxide film by taking a glass substrate with a laminated structure of a central electrode (3) and a round hole electrode (2) as the upper substrate and a common ITO glass substrate as a lower substrate;
the flexible piezoelectric film composite liquid crystal molecular orientation conversion film (14) is tightly attached to the hard substrate, and the hard substrate and the upper substrate are aligned and attached to form an upper liquid crystal layer empty box;
aligning and attaching the upper liquid crystal layer empty box and the lower substrate to obtain a cascade type liquid crystal lens empty box embedded with a piezoelectric film composite liquid crystal molecular orientation conversion film (14);
and filling the fast response liquid crystal (6) with low absorption and high refractive index anisotropy (delta n) in an infrared band to obtain the large-aperture cascading type mode control variable-focus liquid crystal lens system.
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| CN202211688212.4A CN115903313A (en) | 2022-12-27 | 2022-12-27 | Large-aperture cascading mode control variable-focus liquid crystal lens system and method |
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| CN202211688212.4A CN115903313A (en) | 2022-12-27 | 2022-12-27 | Large-aperture cascading mode control variable-focus liquid crystal lens system and method |
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