CN112394579A - Bistable liquid crystal light modulator and preparation method thereof - Google Patents
Bistable liquid crystal light modulator and preparation method thereof Download PDFInfo
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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
- G02F1/137—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 characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering
- G02F1/139—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 characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering based on orientation effects in which the liquid crystal remains transparent
- G02F1/1391—Bistable or multi-stable liquid crystal cells
-
- 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
- G02F1/137—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 characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering
- G02F1/13718—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 characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering based on a change of the texture state of a cholesteric liquid crystal
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- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Liquid Crystal (AREA)
Abstract
A bistable liquid crystal light modulator and a method for manufacturing the same are provided. The bistable liquid crystal dimming device comprises: the liquid crystal display panel comprises a first transparent substrate and a second transparent substrate, wherein the first transparent substrate and the second transparent substrate are parallel to each other and are arranged oppositely to form a liquid crystal box; a first transparent electrode formed on the inner side of the first transparent substrate; a second transparent electrode formed on the inner side of the second transparent substrate; the liquid crystal layer is filled in the liquid crystal box between the first transparent substrate and the second transparent substrate and is a liquid crystal composition containing cholesteric liquid crystal; the bistable liquid crystal light modulation device further comprises frame glue arranged between the first transparent electrode and the second transparent electrode and a plurality of viscous glue points or viscous figure structures, wherein the viscous glue points or the viscous figure structures are dispersedly distributed in an area surrounded by the frame glue. The bistable liquid crystal light modulation device and the preparation method thereof have the advantages of bistable structure, low energy consumption, simple structure, low cost, simplified production process and high product yield.
Description
Technical Field
The invention relates to the technical field of liquid crystal application, in particular to a bistable liquid crystal light modulator and a preparation method thereof.
Background
At present, a liquid crystal dimming film is used as a photoelectric composite device, which mainly comprises a transparent conductive substrate and a liquid crystal layer, and the arrangement state of liquid crystal molecules is controlled by an external electric field mode, so that the transition of the macroscopic states of light transmission and light scattering is realized. The liquid crystal dimming film can be widely applied to industries such as houses, commercial buildings, automobiles and the like, and is used for providing a privacy environment, reducing glare of ambient sunlight, controlling harmful ultraviolet influence and the like. For a flexible liquid crystal dimming film, the existing mature technologies are a Polymer Dispersed Liquid Crystal (PDLC) technology and a polymer stabilized cholesteric liquid crystal (PSCT) technology, and the conversion between a light-transmitting state and a scattering state is realized in an electric control dimming mode. However, both techniques require the introduction of polymers during the fabrication process, which are phase separated by light or by photomasks to form specific polymer networks or polymer walls to provide stable polymer network structures for the liquid crystal. The preparation process is complex, inherent haze is generated due to mismatch of optical refractive indexes of the polymer network or the wall and the liquid crystal material, obvious visual angle problems are generated, and voltage is required to be applied to maintain one state, namely monostability and huge energy consumption.
Therefore, it is necessary to provide a bistable liquid crystal light modulator device and a method for fabricating the same, which is simple in operation and energy-saving, so as to improve the performance of the existing product, reduce the complexity and cost of the fabrication process, and improve the yield of the product.
Disclosure of Invention
The invention aims to provide a bistable liquid crystal light modulator and a preparation method thereof aiming at the technical problems in the prior art.
The invention adopts the following technical scheme:
a bistable liquid crystal dimming device, comprising: a first transparent substrate and a second transparent substrate that are parallel to and opposite to each other to form a liquid crystal cell; a first transparent electrode formed on the inner side of the first transparent substrate; a second transparent electrode formed on the inner side of the second transparent substrate; the liquid crystal layer is filled in the liquid crystal box between the first transparent substrate and the second transparent substrate and is a liquid crystal composition containing cholesteric liquid crystal; the bistable liquid crystal light modulator further comprises frame glue arranged between the first transparent electrode and the second transparent electrode, and a plurality of viscous glue points or viscous graph structures, wherein the viscous glue points or the viscous graph structures are dispersedly arranged in an area surrounded by the frame glue; the bistable liquid crystal dimmer comprises two states of zero electric field stability: a transmissive state that substantially transmits incident light, and a foggy state that substantially scatters incident light.
Preferably, the bistable liquid crystal light modulation device further comprises an alignment layer located inside at least one of the first transparent electrode and the second transparent electrode, the alignment layer is provided with a blank space, and the plurality of glue dots or the adhesive pattern structures are arranged in the blank space.
Preferably, the first transparent substrate and the second transparent substrate are both flexible substrates.
Preferably, the plurality of adhesive dots are distributed in an equidistant lattice form.
Preferably, the plurality of adhesive dots have a diameter size ranging from 0.01mm to 1mm, and the plurality of adhesive dots have a spacing between 0.02mm to 20 mm.
On the other hand, the invention also provides a preparation method of the bistable liquid crystal light-adjusting device, which comprises the following steps:
a. providing a first transparent substrate with a first transparent electrode and a second transparent substrate with a second transparent electrode, wherein the first transparent electrode and the second transparent electrode are respectively positioned at the inner sides of the first transparent substrate and the second transparent substrate and are oppositely arranged;
b. forming a frame glue and a plurality of adhesive glue points or adhesive graph structures on the inner side of the first transparent substrate or the second transparent substrate;
c. forming a liquid crystal layer on an inner side of the first transparent substrate or the second transparent substrate;
d. arranging the inner side of the first transparent substrate and the inner side of the second transparent substrate in parallel and opposite to each other, and tightly attaching the first transparent substrate and the second transparent substrate in a rolling manner;
e. curing the frame glue and the plurality of adhesive glue points or the adhesive graph structure;
f. and cutting to obtain the bistable liquid crystal dimming device, wherein the bistable liquid crystal dimming device comprises two stable states of zero electric field: a transmissive state that substantially transmits incident light, and a foggy state that substantially scatters incident light.
Preferably, the method further comprises a step of forming an alignment layer on an inner side of at least one of the first transparent substrate and the second transparent substrate after the step a and aligning the alignment layer, and a step of forming a blank space on the alignment layer, wherein the blank space is located at a position corresponding to the plurality of adhesive dots or the adhesive pattern structure.
Preferably, the first transparent substrate and the second transparent substrate are both flexible substrates, and the alignment method is a roll-to-roll continuous rubbing method.
Preferably, in the step b, a screen printing or dispensing method is adopted to form the frame glue and the plurality of adhesive dispensing points or the adhesive pattern structure.
Preferably, in the step e, the step of curing the sealant and the plurality of adhesive dots or the adhesive pattern structure further includes a pre-curing step and a step of completely curing after the pre-curing step.
The bistable liquid crystal light modulation device and the preparation method thereof have the advantages of bistable structure, low energy consumption, simple structure, low cost, simplified production process and high product yield.
Drawings
The invention may be better understood by reference to the following description of embodiments of the invention taken in conjunction with the accompanying drawings, in which:
fig. 1 is a schematic cross-sectional view of a bistable liquid crystal dimmer device according to a first embodiment of the present invention;
FIG. 2 is a schematic cross-sectional view of a bistable liquid crystal dimmer device according to a second embodiment of the present invention;
FIG. 3 is a schematic cross-sectional view of a bistable liquid crystal dimmer device according to a third embodiment of the present invention;
FIG. 4 is a schematic cross-sectional view of a bistable liquid crystal dimmer device according to a fourth embodiment of the present invention;
FIG. 5 is a schematic cross-sectional view of a bistable liquid crystal dimmer device according to a fifth embodiment of the present invention;
fig. 6 is a schematic plan view of a possible structure of a plurality of adhesive dots or adhesive patterns in an embodiment of the present invention.
Detailed Description
In the following description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of the present invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced without these specific details. The illustrated exemplary embodiments of the invention are provided for purposes of illustration only and are not intended to be limiting of the invention. Therefore, it is intended that the scope of the invention be limited not by this detailed description, but rather by the claims appended hereto.
The bistable liquid crystal light modulator and the method for manufacturing the same according to the embodiments of the present invention will be described in detail with reference to the accompanying drawings.
The first embodiment:
fig. 1 is a schematic cross-sectional view of a bistable liquid crystal dimmer device according to a first embodiment of the present invention. As shown in fig. 1, the bistable liquid crystal dimming device of the present embodiment includes: a first transparent substrate 10 and a second transparent substrate 20, the first transparent substrate 10 and the second transparent substrate 20 being parallel to each other and disposed opposite to each other to form a liquid crystal cell; a first transparent electrode 30 formed inside the first transparent substrate 10; a second transparent electrode 40 formed inside the second transparent substrate 20; a liquid crystal layer 50 filled in the liquid crystal cell between the first transparent substrate 10 and the second transparent substrate 20, the liquid crystal layer 50 being a liquid crystal composition including cholesteric liquid crystal; the display device further comprises a frame glue 60 arranged between the first transparent electrode 30 and the second transparent electrode 40, and a plurality of adhesive glue dots or adhesive graphic structures 70; the bistable liquid crystal light modulator of the present invention comprises two states of zero electric field stability: a transmissive state that substantially transmits incident light, and a foggy state that substantially scatters incident light.
In this embodiment, the sealant 60 is located between the first transparent substrate 10 and the second transparent substrate 20, and is used for bonding and fixing the first transparent substrate 10 and the second transparent substrate 20, and forms a closed liquid crystal cell space together with the first transparent substrate 10 and the second transparent substrate 20 for accommodating liquid crystal therebetween. The sealant 60 includes a thermal curing adhesive (e.g., a conventional epoxy resin) and a photo curing adhesive (e.g., a conventional UV adhesive; and a UV heating hybrid type adhesive). In the embodiment of the invention, the frame glue is made of UV curing glue K-3357 produced by Kafft company, for example. In the embodiment of the present invention, preferably, the bistable liquid crystal dimming device further includes spacers located between the first transparent substrate 10 and the second transparent substrate 20 for defining the thickness of the liquid crystal cell, and the spacers may be distributed anywhere between the first transparent substrate 10 and the second transparent substrate 20, including in the sealant. The material of the spacer includes resin, glass fiber, and inorganic materials such as polystyrene, silica, and the like. The spacers may be spherical, rod-like, or otherwise shaped. The spacer is dimensioned according to the thickness of the liquid crystal layer of the light modulating device. In a preferred embodiment, the uniformity of the thickness of the liquid crystal layer can be controlled by means of a device with a stitching function.
In this embodiment, as shown in fig. 1, a plurality of adhesive dots or adhesive pattern structures 70 are distributed in the liquid crystal layer 50, which may be a plurality of independent adhesive dots, or an adhesive pattern structure formed by adhesive materials in a dot shape, a strip shape, a zigzag shape, a curved shape or a combination thereof. The sealant material may be the same as the sealant 60, or may be other sealant materials. In this embodiment, the plurality of adhesive dots are distributed in an equidistant lattice form, the pitch is 0.5mm, but not limited thereto, the pitch may be any value from 0.02mm to 20mm, the size of the diameter of the plurality of adhesive dots is 0.05mm, but not limited thereto, the size of the adhesive dots may also beAt any value of 0.01mm to 1 mm. In this embodiment, the glue dots are cured mainly by UV and thermosetting methods, wherein the UV wavelength used for UV curing is 365nm, the curing time is 5s, and the energy range per unit area of the UV light during curing is 10J/cm2The thermal curing temperature is 120 ℃, the curing time is 60min, and according to the difference of the selected adhesive materials, only one mode of UV curing or thermal curing can be selected, which is not described again. In this embodiment, the distribution of the plurality of adhesive dots can realize the adhesion of the first transparent substrate 10 and the second transparent substrate 20 on the premise of ensuring the maximum transmittance of the device, and can effectively prevent the flow of the liquid crystal in the liquid crystal cell. In this embodiment, by providing the plurality of sticky glue dots or the sticky pattern structure 70, the problems of the viewing angle and the haze caused by the polymer network and the polymer wall in the prior art can be avoided, the transmittance of the liquid crystal dimmer in the transmission state is significantly improved, the plurality of sticky glue dots or the sticky pattern structure 70 can also achieve firm adhesion of the upper and lower substrates and prevent the liquid crystal in the liquid crystal layer 50 from flowing, thereby overcoming the problems caused by the reasons of the infirm adhesion or the dislocation and the like between the upper and lower substrates in the roll-to-roll production process, and greatly improving the product yield and the product stability of the bistable liquid crystal dimmer.
The preparation method of the bistable liquid crystal light modulation device of the embodiment comprises the following steps: a. providing a first transparent substrate 10 with a first transparent electrode 30 and a second transparent substrate 20 with a second transparent electrode 40, wherein the first transparent electrode 30 and the second transparent electrode 40 are respectively positioned at the inner sides of the first transparent substrate 10 and the second transparent substrate 20 and are oppositely arranged; b. forming a sealant 60 and a plurality of adhesive dots or adhesive pattern structures 70 on the inner side of the first transparent substrate 10 or the second transparent substrate 20; c. forming a liquid crystal layer 50 inside the first transparent substrate 10 or the second transparent substrate 20; d. arranging the inner sides of the first transparent substrate and the second transparent substrate in parallel and opposite to each other, and tightly attaching the first transparent substrate 10 and the second transparent substrate 20 in a rolling manner; e. curing the sealant 60 and the plurality of adhesive dots or the adhesive pattern structure 70; f. and cutting to obtain the bistable liquid crystal light modulation device, wherein the obtained bistable liquid crystal light modulation device comprises two stable states of zero electric field: a transmissive state that substantially transmits incident light, and a foggy state that substantially scatters incident light.
In this embodiment, the first transparent substrate 10 and the second transparent substrate 20 may be both rigid substrates (e.g., glass substrates), or at least one of them may be a flexible substrate, for example, both the first transparent substrate 10 and the second transparent substrate 20 are flexible substrates, which is beneficial for roll-to-roll mass production and transportation. For example, the first and second transparent substrates 10 and 20 may be selected from one or more of transparent polymer materials such as PET, PEN, PC, PP, PMMA, PBT, PVC, PI, cellulose, and the like. The first transparent electrode 30 formed on the inner side of the first transparent substrate 10 and the second transparent electrode 40 formed on the inner side of the second transparent substrate 20 are preferably made of ITO, but not limited thereto, the first transparent electrode 30 and the second transparent electrode 40 may also be made of a carbon-based conductive film, a metal nanowire conductive film, a metal oxide film, and the like, wherein the carbon-based conductive film mainly includes two types of graphene oxide and carbon nanotube, the metal nanowire conductive film commonly includes silver nanowire, copper nanowire, and the like, and the metal oxide film includes a mixture of indium tin oxide, indium oxide, tin oxide, zinc oxide, and other metal oxides.
In this embodiment, preferably, in the step b, the sealant 60 and the plurality of adhesive dots or adhesive pattern structures 70 are formed by a screen printing or dispensing method. In the step c, the liquid crystal layer 50 is formed by at least one of knife coating, spray coating, and slit coating. In step e, the step of curing the sealant 60 and the plurality of adhesive dots or the adhesive pattern structure 70 further includes a step of pre-curing and a step of completely curing after pre-curing. In this embodiment, step a preferably further includes a step of removing the protective film and cleaning the substrate for the first transparent substrate 10 and the second transparent substrate 20. In this embodiment, the liquid crystal composition in the liquid crystal layer 50 preferably includes a nematic liquid crystal compound, a chiral agent compound, and a bimesogenic compound, and the nematic liquid crystal compound has a structural formula of
The structural formula of the chiral agent compound is
The structural formula of the bimesogenic compound is
The bimesogenic compound refers to a liquid crystal compound containing two mesogens in a molecule, that is, a group having two liquid crystal phase-inducing abilities. Generally, a liquid crystal composition is prepared in a predetermined ratio, heated and stirred to form an isotropic liquid, and then cooled to room temperature to form an isotropic liquid crystal composition. The thickness of the liquid crystal layer 50 is controlled by the size of the spacers, which is in the range of about 1-60 μm. In a preferred embodiment, the liquid crystal layer is about 5-60 μm thick. In a more preferred embodiment, the liquid crystal layer is about 10-60 μm thick.
The following description is directed to a continuous production process, in particular, in the form of a practical example.
Firstly, the flexible first transparent substrate 10 (with the first transparent electrode 30) and the flexible second transparent substrate 20 (with the second transparent electrode 40) are drawn by a take-up roll shaft, and processes such as protective film stripping, conductive surface water washing, plasma treatment and the like are sequentially carried out according to a certain running speed, so that the surfaces of the first transparent substrate 10 and the second transparent substrate 20 are subjected to purification and activation treatment, wherein the power of the plasma treatment is 150W. Then, a spherical polystyrene spacer is sprayed on the inner side of the first transparent substrate 10 or the second transparent substrate 20, the size of the spacer is 20 μm, and the density range is 30 + -10 particles/mm2. Then, a spacer adhesive material mixture with a mass concentration of 0.5% is prepared, for example, the adhesive material is epoxy resin, the size of the spacer is 20 μm, vacuum defoaming treatment is performed, the frame glue 60 and a plurality of adhesive glue dots or adhesive pattern structures 70 are printed on the surface of the first transparent substrate 10 or the second transparent substrate 20 sprayed with the spacer by using a screen printing technology, and the screen pattern of the printing screen is adjustedThe pattern size and form controls the distribution and size of the plurality of adhesive dots or adhesive pattern structures 70. In this embodiment, the plurality of adhesive dots are columnar, have a diameter of 100 μm ± 20 μm, are arranged in a matrix form, and have a spacing of 1 mm. Then, by using a slit coating technology, the coating amount and the distance between the coating head and the substrate are accurately controlled to coat the liquid crystal on the surface of the other substrate on which the sealant 60 and the plurality of viscous sealant dots or the viscous graphic structure 70 are not printed, and the first transparent substrate 10 and the second transparent substrate 20 are attached by using a rubber roller. And then, performing UV light curing and high-temperature curing baking to complete the bonding and packaging between the first transparent substrate 10 and the second transparent substrate 20 of the device. And finally, cutting to obtain the flexible bistable liquid crystal light-adjusting device. In this example, the wavelength of the curing ultraviolet light was 365nm, the curing time was 5s, and the energy range per unit area of UV during curing was 10J/cm2The thermal curing temperature is 120 ℃, and the curing time is 60 min. And finally, voltage driving is carried out on the bistable dimming device, and the selection of the driving mode is determined by the structure of the dimming device, the thickness of the liquid crystal layer, the liquid crystal components and the like. In this embodiment, the bistable light modulator is driven to the fog state and the transmission state, and then the haze of the bistable light modulator is measured by using a WGT-type haze meter, where the haze of the fog state of the bistable liquid crystal light modulator prepared by the preparation method of this embodiment is 91.57%, and the haze of the transmission state is 2.95%.
In this embodiment, after the step of performing the cleaning and activating treatment on the surfaces of the first transparent substrate 10 and the second transparent substrate 20, a step of directly rubbing and aligning the inner side surfaces of the first transparent substrate 10 and the second transparent substrate 20, and a step of cleaning the inner side surfaces of the first transparent substrate 10 and the second transparent substrate 20 after rubbing and aligning may be further included. The rubbing alignment is directly performed on the inner side surfaces of the first transparent substrate 10 and the second transparent substrate 20, which is beneficial to the alignment of the subsequent liquid crystal layer 50 and is not described again.
The embodiment is not limited thereto, and preferably, the first transparent substrate 10 and the second transparent substrate 20 are both flexible substrates, and the plurality of adhesive dots or adhesive pattern structures 70 may be formed by screen printing or dispensing. The liquid crystal layer 50 may be formed by at least one of knife coating, spray coating, or slit coating. The step of curing the sealant 60 and the plurality of adhesive dots or adhesive pattern structure 70 further includes a pre-curing step and a step of completely curing after pre-curing, which is not described in detail.
Second embodiment:
the bistable liquid crystal light modulator and the manufacturing method thereof in this embodiment are the same as those in the first embodiment and are not repeated, but the difference is that the bistable liquid crystal light modulator further includes a first alignment layer 81 located inside the first transparent electrode 30. Correspondingly, the method for manufacturing the bistable liquid crystal light-adjusting device of the embodiment further includes a step of forming the first alignment layer 81 and a step of aligning the first alignment layer 81.
Fig. 2 is a schematic cross-sectional view of a bistable liquid crystal dimmer device according to a second embodiment of the present invention. As shown in fig. 2, in the present embodiment, the first alignment layer 81 is located inside the first transparent electrode 30, and the bistable liquid crystal light modulator of the present embodiment is prepared by the following steps:
firstly, the flexible first transparent substrate 10 and the flexible second transparent substrate 20 are drawn by the winding roller shaft to sequentially carry out processes of protective film stripping, conductive surface water washing, plasma treatment and the like according to a certain running speed, and the surfaces of the first transparent substrate 10 and the second transparent substrate 20 are subjected to purification and activation treatment, wherein the power of the plasma treatment is 150W. And then, entering a forming procedure of a first alignment layer 81, selecting a low-temperature curing alignment agent DL-4027, uniformly coating the alignment agent solution on one side of the first transparent substrate 10 with the first transparent electrode 30 by utilizing a slit coating technology, then carrying out high-temperature curing to form the alignment layer, and curing for 0.5 hour at 120 ℃ by adopting tunnel furnace curing. After the alignment layer is configured, rubbing alignment is carried out, a rubbing roller is adopted for continuous rubbing alignment in the alignment process, the flexible first transparent substrate 10 is half-wrapped or partially wrapped on the rubbing roller by adjusting the height of the rubbing roller shaft, and the alignment effect is adjusted by controlling the height of the roller shaft, the winding and unwinding traction tension, the winding and unwinding speed, the rotating speed of the rubbing roller and other parameters. Then, spraying on the inner side of the first transparent substrate 10 or the second transparent substrate 20Spherical polystyrene spacers with a size of 20 μm and a density in the range of 30 + -10 particles/mm2. Then, a spacer adhesive material mixture with a mass concentration of 0.5% is prepared, for example, the adhesive material is epoxy resin, the size of the spacer is 20 μm, vacuum defoaming treatment is performed, the sealant 60 and the plurality of adhesive dots or adhesive pattern structures 70 are printed on the surface of the first transparent substrate 10 or the second transparent substrate 20 on which the spacer is sprayed by using a screen printing technique, and the distribution and size of the plurality of adhesive dots or adhesive pattern structures 70 are controlled by adjusting the size and form of the screen pattern of the printing screen. In this embodiment, the plurality of adhesive dots are columnar, have a diameter of 100 μm ± 20 μm, are arranged in a matrix form, and have a spacing of 1 mm. And then, by utilizing a slit coating technology, precisely controlling the coating amount and the distance between the coating head and the substrate, coating liquid crystal on the surface of another substrate which is not printed with the frame glue 60 and the plurality of viscous glue points or viscous pattern structures 70 to form a liquid crystal layer 50, utilizing a rubber roller to realize the bonding of the first transparent substrate 10 and the second transparent substrate 20, and then carrying out UV light curing and high-temperature curing to complete the bonding and packaging between the first transparent substrate 10 and the second transparent substrate 20 of the device. And finally, cutting to obtain the flexible bistable liquid crystal light-adjusting device. In this example, the wavelength of the curing ultraviolet light was 365nm, the curing time was 5s, and the energy range per unit area of UV during curing was 10J/cm2The thermal curing temperature is 120 ℃, and the curing time is 60 min. And finally, voltage driving is carried out on the bistable dimming device, and the selection of the driving mode is determined by the structure of the dimming device, the thickness of the liquid crystal layer, the liquid crystal components and the like. In this embodiment, the bistable light modulator is driven to the fog state and the transmission state, and then the haze of the bistable light modulator is measured by using a WGT-type haze meter, where the haze of the fog state of the bistable liquid crystal light modulator prepared by the preparation method of this embodiment is 91.27%, and the haze of the transmission state is 2.86%.
The present embodiment is not limited thereto, and methods of aligning the first alignment layer 81 include a rubbing alignment method, a photoalignment method, an oblique evaporation method, an LB film method, or the like. Preferably, the first transparent substrate 10 and the second transparent substrate 20 are both flexible substrates, and the alignment method is a roll-to-roll continuous rubbing method. Preferably, the plurality of adhesive dots or adhesive pattern structures 70 may be formed by screen printing or dispensing. The liquid crystal layer 50 may be formed by at least one of knife coating, spray coating, or slit coating. The step of curing the sealant 60 and the plurality of adhesive dots or adhesive pattern structure 70 further includes a pre-curing step and a step of completely curing after pre-curing, which is not described in detail.
The third embodiment:
the bistable liquid crystal light modulator and the manufacturing method thereof of this embodiment are the same as those of the second embodiment and are not repeated, except that in the bistable liquid crystal light modulator of this embodiment, the first blank region 81 is provided with a plurality of first blank regions 811, the positions of the first blank regions 811 correspond to the positions of the plurality of adhesive dots or adhesive pattern structures 70, the plurality of adhesive dots or adhesive pattern structures 70 are disposed in the first blank regions 811, so that one side of the plurality of adhesive dots or adhesive pattern structures 70 is still directly contacted with the first transparent electrode 30, and the plurality of adhesive dots or adhesive pattern structures 70 are directly adhered to the first transparent electrode 30, which has a firmer adhesion effect than the adhesive dots or adhesive pattern structures are directly adhered to the first alignment layer 81. Accordingly, the method for manufacturing the bistable liquid crystal light-modulating device of the embodiment further includes a step of forming the first blank area 811 after the step of forming the first alignment layer 81 and before the first alignment layer 81 is completely cured.
Fig. 3 is a schematic cross-sectional view of a bistable liquid crystal dimmer device according to a third embodiment of the present invention. As shown in fig. 3, in the present embodiment, the first alignment layer 81 is also located inside the first transparent electrode 30, and the bistable liquid crystal light modulator of the present embodiment is prepared by:
firstly, the flexible first transparent substrate 10 and the flexible second transparent substrate 20 are drawn by the winding roller shaft to sequentially carry out processes of protective film stripping, conductive surface water washing, plasma treatment and the like according to a certain running speed, and the surfaces of the first transparent substrate 10 and the second transparent substrate 20 are subjected to purification and activation treatment, wherein the power of the plasma treatment is 150W. Then entering the forming procedure of the first alignment layer 81, selecting the low-temperature curing alignment agent DL-4027, and uniformly coating the alignment agent solution on the first alignment layer by using the slit coating technologyThe side of the first transparent substrate 10 having the first transparent electrode 30 is then subjected to fixed point pressing or fixed point suction where the first blank area 811 needs to be formed, so that a portion of the first alignment layer 81 in the area is squeezed out or sucked, leaving the first blank area 811. And then, carrying out high-temperature solid baking to form an alignment layer, and carrying out solid baking at 120 ℃ for 0.5 hour by adopting a tunnel furnace. After the alignment layer is configured, rubbing alignment is carried out, a rubbing roller is adopted for continuous rubbing alignment in the alignment process, the flexible first transparent substrate 10 is half-wrapped or partially wrapped on the rubbing roller by adjusting the height of the rubbing roller shaft, and the alignment effect is adjusted by controlling the height of the roller shaft, the winding and unwinding traction tension, the winding and unwinding speed, the rotating speed of the rubbing roller and other parameters. Then, a spherical polystyrene spacer is sprayed on the inner side of the first transparent substrate 10 or the second transparent substrate 20, the size of the spacer is 20 μm, and the density range is 30 + -10 particles/mm2. Then, a spacer adhesive material mixture with a mass concentration of 0.5% is prepared, for example, the adhesive material is epoxy resin, the size of the spacer is 20 μm, vacuum defoaming treatment is performed, the sealant 60 and the plurality of adhesive dots or adhesive pattern structures 70 are printed on the surface of the first transparent substrate 10 or the second transparent substrate 20 on which the spacer is sprayed by using a screen printing technique, and the distribution and size of the plurality of adhesive dots or adhesive pattern structures 70 are controlled by adjusting the size and form of the screen pattern of the printing screen. In this embodiment, the plurality of adhesive dots are columnar, have a diameter of 100 μm ± 20 μm, are arranged in a matrix form, and have a spacing of 1 mm. And then, by utilizing a slit coating technology, precisely controlling the coating amount and the distance between the coating head and the substrate, coating liquid crystal on the surface of another substrate which is not printed with the frame glue 60 and the plurality of viscous glue points or viscous pattern structures 70 to form a liquid crystal layer 50, utilizing a rubber roller to realize the bonding of the first transparent substrate 10 and the second transparent substrate 20, and then carrying out UV light curing and high-temperature curing to complete the bonding and packaging of the first transparent substrate 10 and the second transparent substrate 20 of the device. And finally, cutting to obtain the flexible bistable liquid crystal light-adjusting device. In this example, the wavelength of the curing UV light is 365nm, the curing time is 5s, and the UV unit during curingThe energy range on the area is 10J/cm2The thermal curing temperature is 120 ℃, and the curing time is 60 min. And finally, voltage driving is carried out on the bistable dimming device, and the selection of the driving mode is determined by the structure of the dimming device, the thickness of a liquid crystal layer, liquid crystal components and the like. In this embodiment, the bistable light modulator is driven to the fog state and the transmission state, and then the haze of the bistable light modulator is measured by using a WGT-type haze meter, where the haze of the fog state of the bistable liquid crystal light modulator prepared by the preparation method of this embodiment is 91.12%, and the haze of the transmission state is 2.76%.
The present embodiment is not limited thereto, and methods of aligning the first alignment layer 81 include a rubbing alignment method, a photoalignment method, an oblique evaporation method, an LB film method, or the like. Preferably, the first transparent substrate 10 and the second transparent substrate 20 are both flexible substrates, and the alignment method is a roll-to-roll continuous rubbing method. Preferably, the plurality of adhesive dots or adhesive pattern structures 70 may be formed by screen printing or dispensing. The liquid crystal layer 50 may be formed by at least one of knife coating, spray coating, or slit coating. The step of curing the sealant 60 and the plurality of adhesive dots or adhesive pattern structure 70 further includes a pre-curing step and a step of completely curing after pre-curing, which is not described in detail.
The fourth embodiment:
the bistable liquid crystal light modulation device and the manufacturing method thereof in this embodiment are the same as those in the first embodiment and are not repeated, but the difference is that the bistable liquid crystal light modulation device in this embodiment further includes a first alignment layer 81 located inside the first transparent electrode 30 and a second alignment layer 82 located inside the second transparent electrode 40. Correspondingly, the method for manufacturing the bistable liquid crystal light-adjusting device of the embodiment further includes a step of forming the first alignment layer 81, a step of aligning the first alignment layer 81, a step of forming the second alignment layer 82, and a step of aligning the second alignment layer 82.
Fig. 4 is a schematic cross-sectional view of a bistable liquid crystal dimmer device according to a fourth embodiment of the present invention. As shown in fig. 4, in the present embodiment, the first alignment layer 81 is located inside the first transparent electrode 30, and the second alignment layer 82 is located inside the second transparent electrode 40, and the method for manufacturing the bistable liquid crystal light modulator device of the present embodiment includes:
firstly, the flexible first transparent substrate 10 and the flexible second transparent substrate 20 are drawn by the winding roller shaft to sequentially carry out processes of protective film stripping, conductive surface water washing, plasma treatment and the like according to a certain running speed, and the surfaces of the first transparent substrate 10 and the second transparent substrate 20 are subjected to purification and activation treatment, wherein the power of the plasma treatment is 150W. Then, entering the forming process of a first alignment layer 81 and a second alignment layer 82, selecting a low-temperature curing alignment agent DL-4027, uniformly coating an alignment agent solution on one side of the first transparent substrate 10 with the first transparent electrode 30 by using a slit coating technology, then performing high-temperature curing to form the alignment layer, and curing for 0.5 hour at 120 ℃ by using a tunnel furnace; the alignment agent solution is uniformly coated on the side of the second transparent substrate 10 having the second transparent electrode 40, and then high-temperature curing is performed to form an alignment layer, and curing is performed at 120 ℃ for 0.5 hour by using a tunnel furnace. In this embodiment, the order of forming the first alignment layer 81 and the second alignment layer 82 may be interchanged. After the alignment layers are configured, rubbing alignment is respectively carried out, a rubbing roller is adopted for continuous rubbing alignment in the alignment process, the flexible first transparent substrate 10 with one side of the first alignment layer 81 and the flexible second transparent substrate 20 with one side of the second alignment layer 82 are respectively wrapped on the rubbing roller in a half wrapping mode or a local wrapping mode by adjusting the height of the rubbing roller shaft, and the alignment effect is adjusted by controlling the height of the roller shaft, the winding and unwinding traction tension, the winding and unwinding speed, the rotating speed of the rubbing roller and other parameters. Then, a spherical polystyrene spacer is sprayed on the inner side of the first transparent substrate 10 or the second transparent substrate 20, the size of the spacer is 20 μm, and the density range is 30 + -10 particles/mm2. Then, a spacer adhesive material mixture with a mass concentration of 0.5% is prepared, for example, the adhesive material is epoxy resin, the size of the spacer is 20 μm, vacuum defoaming treatment is performed, the frame glue 60 and the plurality of adhesive dots or adhesive pattern structures 70 are printed on the surface of the first transparent substrate 10 or the second transparent substrate 20 on which the spacers are sprayed by using a screen printing technology, and the distribution of the plurality of adhesive dots or adhesive pattern structures 70 is controlled by adjusting the size and the form of the screen pattern of the printing screenAnd size. In this embodiment, the plurality of adhesive dots are columnar, have a diameter of 100 μm ± 20 μm, are arranged in a matrix form, and have a spacing of 1 mm. And then, by utilizing a slit coating technology, precisely controlling the coating amount and the distance between the coating head and the substrate, coating liquid crystal on the surface of another substrate which is not printed with the frame glue 60 and the plurality of viscous glue points or viscous pattern structures 70 to form a liquid crystal layer 50, utilizing a rubber roller to realize the bonding of the first transparent substrate 10 and the second transparent substrate 20, and then carrying out UV light curing and high-temperature curing to complete the bonding and packaging between the first transparent substrate 10 and the second transparent substrate 20 of the device. And finally, cutting to obtain the flexible bistable liquid crystal light-adjusting device. In this example, the wavelength of the curing ultraviolet light was 365nm, the curing time was 5s, and the energy range per unit area of UV during curing was 10J/cm2The thermal curing temperature is 120 ℃, and the curing time is 60 min. And finally, voltage driving is carried out on the bistable dimming device, and the selection of the driving mode is determined by the structure of the dimming device, the thickness of the liquid crystal layer, the liquid crystal components and the like. In this embodiment, the bistable light modulator is driven to the fog state and the transmission state, and then the haze of the bistable light modulator is measured by using a WGT-type haze meter, where the haze of the prepared bistable liquid crystal light modulator is 90.43% and the haze of the transmission state is 1.96%. In this example, when the first alignment layer and the second alignment layer are provided and aligned separately, the liquid crystal molecules have excellent alignment, and thus the transmission state shows a lower haze value.
The present embodiment is not limited thereto, and methods of aligning the first alignment layer 81 and the second alignment layer 82 include a rubbing alignment method, a photoalignment method, an oblique evaporation method, an LB film method, or the like. Preferably, the first transparent substrate 10 and the second transparent substrate 20 are both flexible substrates, and the alignment method is a roll-to-roll continuous rubbing method. Preferably, the plurality of adhesive dots or adhesive pattern structures 70 may be formed by screen printing or dispensing. The liquid crystal layer 50 may be formed by at least one of knife coating, spray coating, or slit coating. The step of curing the sealant 60 and the plurality of adhesive dots or adhesive pattern structure 70 further includes a pre-curing step and a step of completely curing after pre-curing, which is not described in detail.
Fifth embodiment:
the bistable liquid crystal light modulator and the manufacturing method thereof in this embodiment are the same as those in the fourth embodiment and will not be described again, the difference is that in the bistable liquid crystal light modulation device of this embodiment, the first alignment layer 81 is provided with a plurality of first blank areas 811, the second alignment layer 82 is provided with a plurality of second blank areas 822, the positions of the first blank areas 811 and the second blank areas 822 correspond to the positions of the plurality of adhesive dots or adhesive pattern structures 70, the plurality of adhesive dots or adhesive pattern structures 70 are disposed in the first blank areas 811 and the second blank areas 822, the two sides of the plurality of adhesive dots or adhesive pattern structures 70 are directly contacted with the first transparent electrode 30 and the second transparent electrode 40, respectively, and the plurality of adhesive dots or adhesive pattern structures 70 are directly adhered to the two sides of the first transparent electrode 30 and the second transparent electrode 40, and have a stronger adhesion effect than the plurality of adhesive dots or adhesive pattern structures 70 are directly adhered to the first alignment layer 81 and the second alignment layer 82. Accordingly, the method for manufacturing a bistable liquid crystal dimmer device according to the present embodiment further includes a step of forming the first blank area 811 after the step of forming the first alignment layer 81 and before the first alignment layer 81 is completely cured, and a step of forming the second blank area 822 after the step of forming the second alignment layer 82 and before the second alignment layer 82 is completely cured.
Fig. 5 is a schematic cross-sectional view of a bistable liquid crystal dimmer device according to a fifth embodiment of the present invention. As shown in fig. 5, in the present embodiment, the first alignment layer 81 is also located inside the first transparent electrode 30, and the second alignment layer 82 is also located inside the second transparent electrode 40, and the bistable liquid crystal light modulator device of the present embodiment is prepared by:
firstly, the flexible first transparent substrate 10 and the flexible second transparent substrate 20 are drawn by the winding roller shaft to sequentially carry out processes of protective film stripping, conductive surface water washing, plasma treatment and the like according to a certain running speed, and the surfaces of the first transparent substrate 10 and the second transparent substrate 20 are subjected to purification and activation treatment, wherein the power of the plasma treatment is 150W. Then entering the forming process of the first alignment layer 81 and the second alignment layer 82, selecting the low-temperature curing alignment agent DL-4027, and respectively homogenizing the alignment agent solutions by using the slit coating technologyIs coated on one side of the first transparent substrate 10 having the first transparent electrode 30 and one side of the second transparent substrate 20 having the second transparent electrode 40, and then fixed point pressing or fixed point suction is performed on a place where the first blank area 811 needs to be formed and a place where the second blank area 822 needs to be formed, so that a portion of the first alignment layer 81 and the second alignment layer 82 of the area is pressed out or sucked, leaving the first blank area 811 and the second blank area 822. And then, performing high-temperature curing to form a first alignment layer 81 and a second alignment layer 82, and curing for 0.5 hour at 120 ℃ by using a tunnel furnace. After the configuration of the alignment layers is completed, rubbing alignment is carried out, a rubbing roller is adopted for continuous rubbing alignment in the alignment process, the flexible side of the first transparent substrate 10 with the first alignment layer 81 and the flexible side of the second transparent substrate 20 with the second alignment layer 82 are respectively wrapped on the rubbing roller in a half wrapping mode or a local wrapping mode by adjusting the height of the rubbing roller shaft, and the alignment effect is adjusted by controlling the height of the roller shaft, the winding and unwinding traction tension, the winding and unwinding speed, the rotating speed of the rubbing roller and other parameters. In this embodiment, the order of the steps of forming the first alignment layer 81 and the second alignment layer 82 may be interchanged, and likewise, the order of the steps of subsequently performing the curing and rubbing alignment on the first alignment layer 81 and the second alignment layer 82, respectively, may be interchanged. Then, a spherical polystyrene spacer is sprayed on the inner side of the first transparent substrate 10 or the second transparent substrate 20, the size of the spacer is 20 μm, and the density range is 30 + -10 particles/mm2. Then, a spacer adhesive material mixture with a mass concentration of 0.5% is prepared, for example, the adhesive material is epoxy resin, the size of the spacer is 20 μm, vacuum defoaming treatment is performed, the sealant 60 and the plurality of adhesive dots or adhesive pattern structures 70 are printed on the surface of the first transparent substrate 10 or the second transparent substrate 20 on which the spacer is sprayed by using a screen printing technique, and the distribution and size of the plurality of adhesive dots or adhesive pattern structures 70 are controlled by adjusting the size and form of the screen pattern of the printing screen. In this embodiment, the plurality of adhesive dots are columnar, have a diameter of 50 μm ± 5 μm, are arranged in a matrix form, and have a spacing of 0.5 mm. Then, the liquid crystal is coated by using a slit coating technique and accurately controlling the coating amount and the distance between the coating head and the substrateAnd forming a liquid crystal layer 50 on the surface of the other substrate on which the sealant 60 and the plurality of adhesive dots or adhesive pattern structures 70 are not printed, adhering the first transparent substrate 10 to the second transparent substrate 20 by using a rubber roller, and then performing UV (ultraviolet) light curing and high-temperature curing to complete bonding and packaging between the first transparent substrate 10 and the second transparent substrate 20 of the device. And finally, cutting to obtain the flexible bistable liquid crystal light-adjusting device. In this example, the wavelength of the curing ultraviolet light was 365nm, the curing time was 5s, and the energy range per unit area of UV during curing was 10J/cm2The thermal curing temperature is 120 ℃, and the curing time is 60 min. And finally, voltage driving is carried out on the bistable dimming device, and the selection of the driving mode is determined by the structure of the dimming device, the thickness of the liquid crystal layer, the liquid crystal components and the like. In this embodiment, the bistable light modulator is driven to the fog state and the transmission state, and then the haze of the bistable light modulator is measured by using a WGT-type haze meter, where the haze of the fog state of the bistable liquid crystal light modulator prepared by the preparation method of this embodiment is 90.75%, and the haze of the transmission state is 1.49%.
The present embodiment is not limited thereto, and methods of aligning the first alignment layer 81 and the second alignment layer 82 include a rubbing alignment method, a photoalignment method, an oblique evaporation method, an LB film method, or the like. Preferably, the first transparent substrate 10 and the second transparent substrate 20 are both flexible substrates, and the alignment method is a roll-to-roll continuous rubbing method. Preferably, the plurality of adhesive dots or adhesive pattern structures 70 may be formed by screen printing or dispensing. The liquid crystal layer 50 may be formed by at least one of knife coating, spray coating, or slit coating. The step of curing the sealant 60 and the plurality of adhesive dots or adhesive pattern structure 70 further includes a pre-curing step and a step of completely curing after pre-curing, which is not described in detail.
Fig. 6 is a schematic plan view of a possible multiple adhesive dots or adhesive pattern structure 70 in an embodiment of the invention. As shown in fig. 6, in the embodiment of the invention, when the plurality of adhesive dots or the adhesive pattern structure 70 adopts an arrangement of the plurality of adhesive dots, it may be a regular matrix arrangement, or a staggered arrangement or other arrangement, without limitation; when the plurality of adhesive dots or adhesive pattern structures 70 are a plurality of adhesive pattern structures, the adhesive dots or adhesive pattern structures may be a plurality of stripes arranged in a matrix, or may be a polygonal structure (e.g., regular pentagonal or hexagonal) that is closely arranged with each other, without limitation. According to the invention, the plurality of viscous glue dots or viscous graph structures 70 are arranged in the frame glue, so that the first transparent substrate 10 and the second transparent substrate 20 are firmly bonded, the liquid crystal component in the liquid crystal box can be prevented from flowing, and the structural stability and the product reliability of the liquid crystal dimming device produced in roll-to-roll mass production are greatly improved.
The preparation method of the bistable light modulator disclosed by the invention provides anchoring energy for the liquid crystal composition containing the bimesogenic compound by utilizing the combination of the use and orientation arrangement methods of various alignment layers, so that a liquid crystal layer can be stabilized without a polymer network, and the bistable state under a zero electric field is realized, thereby simplifying the preparation process, saving the cost and improving the yield of products. Meanwhile, the prepared bistable light modulation device has lower transmission state haze and higher fog state haze, can be applied to intelligent light modulation glass or other devices, and can provide enough privacy isolation while providing high light transmittance. The transmission state haze of the existing dimming glass product is about 6%, the transmission state haze can be about 3% in a very small number, and the haze state haze is about 90%. The bistable light modulation device has the advantages of less than 3% of transmission state haze, more than 90% of fog state haze, lower transmission state haze and higher fog state haze, so that the bistable light modulation device has a better effect compared with the existing light modulation device. The bistable liquid crystal light modulation device and the preparation method thereof have the advantages of bistable structure, low energy consumption, simple structure, low cost, simplified production process and high product yield.
The technical principle of the present invention is described above in connection with specific embodiments. The description is made for the purpose of illustrating the principles of the invention and should not be construed in any way as limiting the scope of the invention. Based on the explanations herein, those skilled in the art will be able to conceive of other embodiments of the present invention without inventive effort, which would fall within the scope of the present invention.
Claims (10)
1. A bistable liquid crystal dimmer device, said bistable liquid crystal dimmer device comprising:
a first transparent substrate and a second transparent substrate that are parallel to and opposite to each other to form a liquid crystal cell;
a first transparent electrode formed on the inner side of the first transparent substrate;
a second transparent electrode formed on the inner side of the second transparent substrate;
the liquid crystal layer is filled in the liquid crystal box between the first transparent substrate and the second transparent substrate and is a liquid crystal composition containing cholesteric liquid crystal;
the bistable liquid crystal light modulator further comprises frame glue arranged between the first transparent electrode and the second transparent electrode, and a plurality of viscous glue points or viscous graph structures, wherein the viscous glue points or the viscous graph structures are dispersedly arranged in an area surrounded by the frame glue;
the bistable liquid crystal dimmer comprises two states of zero electric field stability: a transmissive state that substantially transmits incident light, and a foggy state that substantially scatters incident light.
2. The bistable liquid crystal device of claim 1, further comprising an alignment layer disposed inside at least one of said first transparent electrode and said second transparent electrode, said alignment layer being provided with a blank space, said plurality of adhesive dots or said adhesive pattern structure being disposed in said blank space.
3. The bistable liquid crystal dimmer device of claim 1, wherein said first transparent substrate and said second transparent substrate are both flexible substrates.
4. The bistable liquid crystal dimmer of claim 1, wherein said plurality of adhesive dots are arranged in an equally spaced lattice.
5. The bistable liquid crystal dimmer device of claim 4, wherein said plurality of adhesive dots have a diameter size ranging between 0.01mm and 1mm, and wherein said plurality of adhesive dots have a pitch between 0.02mm and 20 mm.
6. A method for manufacturing a bistable liquid crystal light modulator device, the method comprising:
a. providing a first transparent substrate with a first transparent electrode and a second transparent substrate with a second transparent electrode, wherein the first transparent electrode and the second transparent electrode are respectively positioned at the inner sides of the first transparent substrate and the second transparent substrate and are oppositely arranged;
b. forming a frame glue and a plurality of adhesive glue points or adhesive graph structures on the inner side of the first transparent substrate or the second transparent substrate;
c. forming a liquid crystal layer on an inner side of the first transparent substrate or the second transparent substrate;
d. arranging the inner side of the first transparent substrate and the inner side of the second transparent substrate in parallel and opposite to each other, and tightly attaching the first transparent substrate and the second transparent substrate in a rolling manner;
e. curing the frame glue and the plurality of adhesive glue points or the adhesive graph structure;
f. cutting to obtain the bistable liquid crystal light-adjusting device,
the bistable liquid crystal dimmer comprises two states of zero electric field stability: a transmissive state that substantially transmits incident light, and a foggy state that substantially scatters incident light.
7. The method for manufacturing a bistable liquid crystal dimmer device according to claim 6, further comprising: a step of forming an alignment layer on an inner side of at least one of the first transparent substrate and the second transparent substrate after the step a and aligning the alignment layer; and forming a blank area on the alignment layer, wherein the position of the blank area corresponds to the positions of the adhesive dots or the adhesive pattern structure.
8. The method of claim 7, wherein the first transparent substrate and the second transparent substrate are both flexible substrates, and the alignment process is roll-to-roll continuous rubbing.
9. The method of claim 6, wherein the step b comprises forming the sealant and the plurality of adhesive dots or the adhesive pattern structure by screen printing or dispensing.
10. The method according to claim 6, wherein the step of curing the sealant and the plurality of adhesive dots or the adhesive pattern structure in step e further comprises a pre-curing step and a full curing step after the pre-curing step.
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| CN201910758932.5A CN112394579A (en) | 2019-08-16 | 2019-08-16 | Bistable liquid crystal light modulator and preparation method thereof |
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| CN201910758932.5A CN112394579A (en) | 2019-08-16 | 2019-08-16 | Bistable liquid crystal light modulator and preparation method thereof |
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| CN113156716A (en) * | 2021-03-19 | 2021-07-23 | 周洪喜 | Liquid crystal membrane, preparation method thereof and device for preparing liquid crystal membrane |
| CN115064618A (en) * | 2022-08-17 | 2022-09-16 | 苏州晶台光电有限公司 | COB module packaging method |
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Application publication date: 20210223 |