CN111454736B - Circular polarization modulation device and preparation method thereof - Google Patents
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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
- G02F1/1334—Constructional arrangements; Manufacturing methods based on polymer dispersed liquid crystals, e.g. microencapsulated liquid crystals
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- C08G59/00—Polycondensates containing more than one epoxy group per molecule; Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups
- C08G59/18—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing
- C08G59/40—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing characterised by the curing agents used
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- 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
- G02F1/1334—Constructional arrangements; Manufacturing methods based on polymer dispersed liquid crystals, e.g. microencapsulated liquid crystals
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Abstract
A method for manufacturing a circular polarization modulation device is characterized by comprising the following steps. Mixing a liquid crystalline epoxy monomer, a liquid crystalline thiol cross-linking agent, negative liquid crystal, an ultraviolet photoisomerization chiral compound and an accelerator, and pouring the mixture into a liquid crystal box; applying an electric field to the liquid crystal cell to induce the mixture to adopt a parallel orientation; irradiating ultraviolet light on the liquid crystal box by utilizing a photomask in a partition mode to induce the chiral inversion of the ultraviolet photoisomerization chiral compound; and heating the liquid crystal cell to initiate a polymerization reaction between the liquid crystalline epoxy monomer and the liquid crystalline thiol crosslinker.
Description
[ technical field ] A method for producing a semiconductor device
The disclosure relates to the technical field of display, and in particular relates to a circular polarization modulation device and a preparation method thereof.
[ background of the invention ]
The 3D display has attracted much research interest in academia and industry due to its depth information, ability to implement many functions and viewing experiences that 2D displays do not have. With the development of science and technology, 3D display technology is gradually developed.
Currently, the polarized glasses type stereoscopic display technology is one of the most widely applied 3D technologies. The principle of the polarized glasses type stereoscopic display technology is as follows: a viewer wears polarized glasses with two lenses with orthogonal or opposite polarization directions, and a polarized light modulation device is added on the display device, so that light emitted by a part of pixels is emitted in a first polarization direction and can pass through the polarized lens of the left eye, but can be blocked by the polarized lens of the right eye; the light of the other part of pixels is emitted in the second polarization direction, can be blocked by the polarized lens of the left eye, but can pass through the polarized lens of the right eye, so that the left eye and the right eye of a viewer can see the left eye image and the right eye image, and the stereoscopic feeling is obtained.
Compared with the linear polarization glasses type 3D, the polarized light screened out by the circular polarization glasses type 3D is only related to the rotation direction of the polarized light, and no specific polarization direction exists, so that a viewer is allowed to have a wider application market without keeping the head level.
The currently common polarization modulation device mainly comprises a phase difference plate and a liquid crystal type active phase retardation device. The phase difference plate is generally prepared by multilayer resin through a plurality of stretching processes, and the processes are relatively complicated; the liquid crystal active phase delay device can be regarded as a simple liquid crystal box, the orientation of liquid crystal molecules is controlled in a subarea mode through an electric field, and the purpose of controlling the polarization direction of light rays in a subarea mode is achieved.
[ summary of the invention ]
In order to solve the technical problem, the invention provides a circular polarization modulation device and a preparation method thereof.
The invention discloses a preparation method of a circular polarization modulation device, which is characterized by comprising the following steps of: mixing a liquid crystalline epoxy monomer, a liquid crystalline thiol cross-linking agent, negative liquid crystal, an ultraviolet photoisomerization chiral compound and an accelerator, and pouring the mixture into a liquid crystal box; applying an electric field to the liquid crystal cell to induce the mixture to assume a planar orientation; irradiating ultraviolet light on the liquid crystal box by utilizing a photomask in a partition mode to induce the chiral inversion of the ultraviolet photoisomerization chiral compound; and heating the liquid crystal cell to initiate a polymerization reaction between the liquid crystalline epoxy monomer and the liquid crystalline thiol crosslinker to form a rigid polymer network.
According to one aspect of the invention, the mass content of the liquid crystalline epoxy monomer is 0.5 wt% to 15 wt%, the mass content of the liquid crystalline thiol crosslinking agent is 0.5 wt% to 15 wt%, the mass content of the negative liquid crystal is 65 wt% to 98.9 wt%, the mass content of the ultraviolet photoisomerization chiral compound is 0.05 wt% to 10 wt%, and the mass content of the accelerator is 0.05 wt% to 2 wt%.
According to one aspect of the invention, the ultraviolet photoisomerization chiral compound comprises a first handedness, and the ultraviolet photoisomerization chiral compound comprises a second handedness after being irradiated by ultraviolet light.
According to one aspect of the invention, the ultraviolet photoisomerization chiral compound is chiral spiroalkene, chiral diarylethene and the like.
According to one aspect of the invention, the liquid crystal cell comprises a first transparent conductive substrate and a second transparent conductive substrate.
According to one aspect of the present invention, the first transparent conductive substrate and the second transparent conductive substrate are flexible substrates or common substrates.
According to one aspect of the invention, the mixture is poured into the cell by ink-jet printing or roll-to-roll bonding.
The invention discloses a circular polarization modulation device which is characterized by comprising a first transparent conductive substrate; a second transparent conductive substrate disposed in a box with respect to the first transparent conductive substrate; the first electrode is adjacently arranged on one side, close to the second transparent conductive substrate, of the first transparent conductive substrate; the second electrode is adjacently arranged on one side, close to the first transparent conductive substrate, of the second transparent conductive substrate; and a mixed liquid crystal layer disposed between the first transparent conductive substrate and the second transparent conductive substrate.
According to one aspect of the present invention, the mixed liquid crystal layer comprises a liquid crystalline epoxy monomer, a liquid crystalline thiol crosslinker, a negative liquid crystal, an ultraviolet photo-isomerisable chiral compound and an accelerator.
According to one aspect of the invention, the mass content of the liquid crystalline epoxy monomer is 0.5 wt% to 15 wt%, the mass content of the liquid crystalline thiol crosslinking agent is 0.5 wt% to 15 wt%, the mass content of the negative liquid crystal is 65 wt% to 98.9 wt%, the mass content of the ultraviolet photoisomerization chiral compound is 0.05 wt% to 10 wt%, and the mass content of the accelerator is 0.05 wt% to 2 wt%.
The invention orients the liquid crystal molecules by applying an external electric field, does not need additional alignment treatment, has simple process and saves cost. The ultraviolet light induces the chiral inversion of the chiral compound to realize the partition of the left-handed and right-handed liquid crystals, so that the electrode does not need to be patterned, and the manufacturing process is simplified. Due to the addition of the high polymer material, the liquid crystal circularly polarized light modulator can be made of a flexible film material, thereby being beneficial to realizing large-area roll-to-roll processing and reducing the transportation cost of devices.
[ description of the drawings ]
Fig. 1 to 4 are schematic flow charts of a method for manufacturing a circular polarization modulation device according to the present invention;
fig. 5 is a schematic structural diagram of a circular polarization modulation device according to the present invention.
[ detailed description ] embodiments
Fig. 1 to fig. 4 are schematic flow charts illustrating a method for manufacturing a circular polarization modulation device according to the present invention. As shown in fig. 1, a liquid crystalline epoxy monomer 51, a liquid crystalline thiol crosslinker 52, a negative liquid crystal 53, an ultraviolet photoisomerization chiral compound 54, and an accelerator 55 are mixed, and the mixture is poured into a liquid crystal cell. The liquid crystal cell includes a first transparent conductive substrate 10, a second transparent conductive substrate 20, a first electrode 30, and a second electrode 40.
As shown in fig. 2, an electric field is applied to the liquid crystal cell to induce alignment of the mixture according to the direction of the electric field. Because the induced cholesteric liquid crystal is in a plane orientation structure by applying an external electric field, additional alignment treatment is not needed, the manufacturing process is simple, and the cost is saved.
As shown in fig. 3, while applying an electric field, a mask 60 is used to irradiate ultraviolet light 70 on the liquid crystal cell in a partitioned manner to induce the chiral reversal of the ultraviolet photoisomerization chiral compound 54, so that the handedness of cholesteric liquid crystals in adjacent regions is reversed. The ultraviolet photoisomerization chiral compound 54 comprises a first handedness 81, and the ultraviolet photoisomerization chiral compound 54 comprises a second handedness 82 after being irradiated by ultraviolet light. Because the ultraviolet light induces the chiral reversal of the chiral compound to realize the partition of the left-handed and right-handed liquid crystals, the electrode does not need to be subjected to patterning treatment, and the whole common electrode can simplify the manufacturing process.
As shown in fig. 4, under the condition of an applied electric field and ultraviolet irradiation, the liquid crystal cell is heated by an electrothermal polymerization method to initiate a polymerization reaction between the liquid crystalline epoxy monomer 51 and the liquid crystalline thiol crosslinking agent 52, so that a rigid polymer network 90 is formed inside the liquid crystal to stabilize the planar structure and the helical structure of the cholesteric liquid crystal.
After the liquid crystalline epoxy monomer 51 and the liquid crystalline thiol crosslinking agent 52 are polymerized, the electric field, the ultraviolet light and the heating device are removed, and the circularly polarized light modulator disclosed by the invention is obtained.
In one embodiment, the mass content of the liquid crystalline epoxy monomer is 0.5 wt% to 15 wt%, the mass content of the liquid crystalline thiol crosslinking agent is 0.5 wt% to 15 wt%, the mass content of the negative liquid crystal is 65 wt% to 98.9 wt%, the mass content of the ultraviolet photoisomerization chiral compound is 0.05 wt% to 10 wt%, and the mass content of the accelerator is 0.05 wt% to 2 wt%.
In one embodiment, the mass content of the liquid crystalline epoxy monomer is 10 wt% to 15 wt%, the mass content of the liquid crystalline thiol crosslinking agent is 0.5 wt% to 15 wt%, the mass content of the negative liquid crystal is 65 wt% to 95 wt%, the mass content of the ultraviolet photoisomerization chiral compound is 1 wt% to 10 wt%, and the mass content of the accelerator is 0.2 wt% to 2 wt%.
In one embodiment, the mass content of the liquid crystalline epoxy monomer is 0.5 wt% to 10 wt%, the mass content of the liquid crystalline thiol crosslinking agent is 0.5 wt% to 15 wt%, the mass content of the negative liquid crystal is 50 wt% to 98.9 wt%, the mass content of the ultraviolet photoisomerization chiral compound is 0.05 wt% to 20 wt%, and the mass content of the accelerator is 0.05 wt% to 2 wt%.
In one embodiment, the ultraviolet photoisomerization chiral compound is chiral spiroalkene, chiral diarylethene, or the like.
In an embodiment, the first transparent conductive substrate and the second transparent conductive substrate are flexible substrates or common substrates.
In one embodiment, the mixture is poured into the cell by ink jet printing or roll-to-roll bonding.
As shown in fig. 5, a circular polarization modulation device includes a first transparent conductive substrate 10, a second transparent conductive substrate 20 disposed in a cell with respect to the first transparent conductive substrate 10. A first electrode 30 disposed adjacent to one side of the first transparent conductive substrate 10 close to the second transparent conductive substrate 20, and a second electrode 40 disposed adjacent to one side of the second transparent conductive substrate 20 close to the first transparent conductive substrate 10. And a mixed liquid crystal layer 50 disposed between the first transparent conductive substrate 10 and the second transparent conductive substrate 20, wherein a rigid polymer network 90 is formed inside the liquid crystal to stabilize a planar structure and a helical structure of the cholesteric liquid crystal.
In one embodiment, the mixed liquid crystal layer 50 includes a liquid crystalline epoxy monomer 51, a liquid crystalline thiol crosslinker 52, a negative liquid crystal 53, an ultraviolet photo-isomerisable chiral compound 54 and an accelerator 55.
In one embodiment, the mass content of the liquid crystalline epoxy monomer is 0.5 wt% to 15 wt%, the mass content of the liquid crystalline thiol crosslinking agent is 0.5 wt% to 15 wt%, the mass content of the negative liquid crystal is 65 wt% to 98.9 wt%, the mass content of the ultraviolet photoisomerization chiral compound is 0.05 wt% to 10 wt%, and the mass content of the accelerator is 0.05 wt% to 2 wt%.
In one embodiment, the mass content of the liquid crystalline epoxy monomer is 10 wt% to 15 wt%, the mass content of the liquid crystalline thiol crosslinking agent is 0.5 wt% to 15 wt%, the mass content of the negative liquid crystal is 65 wt% to 95 wt%, the mass content of the ultraviolet photoisomerization chiral compound is 1 wt% to 10 wt%, and the mass content of the accelerator is 0.2 wt% to 2 wt%.
In one embodiment, the mass content of the liquid crystalline epoxy monomer is 0.5 wt% to 10 wt%, the mass content of the liquid crystalline thiol crosslinking agent is 0.5 wt% to 15 wt%, the mass content of the negative liquid crystal is 50 wt% to 98.9 wt%, the mass content of the ultraviolet photoisomerization chiral compound is 0.05 wt% to 20 wt%, and the mass content of the accelerator is 0.05 wt% to 2 wt%.
In one embodiment, the ultraviolet photoisomerization chiral compound is chiral spiroalkene, chiral diarylethene, or the like.
In an embodiment, the first transparent conductive substrate and the second transparent conductive substrate are flexible substrates or common substrates.
The foregoing is merely a preferred embodiment of the present disclosure, and it should be noted that modifications and refinements may be made by those skilled in the art without departing from the principle of the present disclosure, and these modifications and refinements should also be construed as the protection scope of the present disclosure.
Claims (7)
1. A method for preparing a circular polarization modulation device is characterized by comprising the following steps:
mixing a liquid crystalline epoxy monomer, a liquid crystalline thiol cross-linking agent, negative liquid crystal, an ultraviolet photoisomerization chiral compound and an accelerator, and pouring the mixture into a liquid crystal box;
applying an electric field to the liquid crystal cell to induce the mixture to assume a planar orientation;
irradiating ultraviolet light on the liquid crystal box by using a photomask subarea while adding an electric field to induce the chiral inversion of the ultraviolet photoinduced isomeric chiral compound, so that the rotation directions of cholesteric liquid crystals in adjacent areas are opposite; and
heating the liquid crystal box to initiate a polymerization reaction between a liquid crystalline epoxy monomer and a liquid crystalline thiol cross-linking agent to form a rigid polymer network to stabilize the planar structure and the helical structure of the cholesteric liquid crystal;
the mass content of the liquid crystalline epoxy monomer is 0.5-15 wt%, the mass content of the liquid crystalline thiol crosslinking agent is 0.5-15 wt%, the mass content of the negative liquid crystal is 65-98.9 wt%, the mass content of the ultraviolet light-induced isomeric chiral compound is 0.05-10 wt%, and the mass content of the accelerator is 0.05-2 wt%.
2. The method for manufacturing a circular polarization modulation device according to claim 1, wherein the ultraviolet photoisomeric chiral compound comprises a first handedness; and is
The ultraviolet photoisomerization chiral compound comprises a second rotation direction after being irradiated by ultraviolet light.
3. The method for preparing a circularly polarized light modulating device as claimed in claim 1, wherein the ultraviolet photoisomerization chiral compound is chiral spiroalkene, chiral diarylethene.
4. The method for manufacturing a circularly polarized light modulating device as claimed in claim 1, wherein the liquid crystal cell comprises a first transparent conductive substrate and a second transparent conductive substrate.
5. The method for manufacturing a circularly polarized light modulating device as claimed in claim 4, wherein the first transparent conductive substrate and the second transparent conductive substrate are flexible substrates or common substrates.
6. The method for manufacturing a circularly polarizing modulator according to claim 1, wherein the mixture is poured into the liquid crystal cell by an ink-jet printing method or roll-to-roll lamination.
7. A circularly polarized light modulating device, comprising:
a first transparent conductive substrate;
a second transparent conductive substrate disposed in a box with respect to the first transparent conductive substrate;
the first electrode is adjacently arranged on one side, close to the second transparent conductive substrate, of the first transparent conductive substrate;
the second electrode is adjacently arranged on one side, close to the first transparent conductive substrate, of the second transparent conductive substrate; and
a mixed liquid crystal layer disposed between the first transparent conductive substrate and the second transparent conductive substrate,
the mixed liquid crystal layer comprises a mixture, the mixture comprises a liquid crystalline epoxy monomer, a liquid crystalline thiol cross-linking agent, negative liquid crystal, an ultraviolet photoisomerization chiral compound and an accelerator, the mixture is in plane orientation,
the adjacent regions have opposite handedness of cholesteric liquid crystal,
a rigid polymer network is formed in the mixed liquid crystal layer to stabilize the planar structure and the spiral structure of the cholesteric liquid crystal;
the mass content of the liquid crystalline epoxy monomer is 0.5-15 wt%, the mass content of the liquid crystalline thiol crosslinking agent is 0.5-15 wt%, the mass content of the negative liquid crystal is 65-98.9 wt%, the mass content of the ultraviolet light-induced isomeric chiral compound is 0.05-10 wt%, and the mass content of the accelerator is 0.05-2 wt%.
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| EP1582893A1 (en) * | 2003-01-10 | 2005-10-05 | Nitto Denko Corporation | Broad-band-cholesteric liquid-crystal film, process for producing the same, circularly polarizing plate, linearly polarizing element, illuminator, and liquid-crystal display |
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| CN101706625A (en) * | 2009-11-13 | 2010-05-12 | 北京科技大学 | Method for preparing wide wave reflective film by using polymer stabilized cholesteric phase liquid crystal material |
| CN106008318A (en) * | 2016-05-19 | 2016-10-12 | 中国科学院化学研究所 | Chiral organic dye molecules having circularly polarized luminescence properties as well as preparation method and application of chiral organic dye molecules |
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| CN109782505A (en) * | 2017-11-14 | 2019-05-21 | 北京大学 | A kind of reflective film and preparation method thereof with light erasing function |
| CN110234834A (en) * | 2017-11-27 | 2019-09-13 | 雷文布里克有限责任公司 | For combining the thermo-electronic switch window of visible light and infrared optical attenuation |
| CN109280556A (en) * | 2018-10-26 | 2019-01-29 | 北京大学 | A method of polymer dispersed liquid-crystal film is prepared based on epoxy substep heat cure |
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