CN113589575B - Manufacturing method of polymer bee net liquid crystal display - Google Patents
Manufacturing method of polymer bee net liquid crystal display Download PDFInfo
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- CN113589575B CN113589575B CN202110927213.9A CN202110927213A CN113589575B CN 113589575 B CN113589575 B CN 113589575B CN 202110927213 A CN202110927213 A CN 202110927213A CN 113589575 B CN113589575 B CN 113589575B
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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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- 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
- G02F1/13345—Network or three-dimensional gels
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1337—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers
- G02F1/133753—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers with different alignment orientations or pretilt angles on a same surface, e.g. for grey scale or improved viewing angle
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1337—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers
- G02F1/13378—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers by treatment of the surface, e.g. embossing, rubbing or light irradiation
- G02F1/133788—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers by treatment of the surface, e.g. embossing, rubbing or light irradiation by light irradiation, e.g. linearly polarised light photo-polymerisation
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/137—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
- G02F1/1396—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 the liquid crystal being selectively controlled between a twisted state and a non-twisted state, e.g. TN-LC cell
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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)
- Mathematical Physics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Dispersion Chemistry (AREA)
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Abstract
The invention provides a manufacturing method of a polymer bee net liquid crystal display. The display consists of two transparent conductive glass (or film) sandwich polymer bee net liquid crystal films, wherein the polymer is a photopolymerization monomer which is easy to polymerize along the vertical light beam propagation direction; the liquid crystal is a positive nematic liquid crystal. The manufacturing method of the display comprises the steps of firstly manufacturing a TN type empty liquid crystal box, then pouring mixed liquid of liquid crystal and prepolymer, and then performing collimation ultraviolet vertical plane exposure phase separation, wherein the polymer forms a honeycomb pore network distributed in two dimensions in the liquid crystal box, and then the polymer bee net liquid crystal display is formed. The polymer bee net liquid crystal display is in a scattering fog state in a zero electric field, and shows a transparent state after voltage is applied, and the transparent state and the scattering state have obvious contrast to form a display effect. The polymer bee net liquid crystal display has the characteristics of simple structure, low cost, easy manufacture and the like, and is suitable for being used as a display with special purposes of certain low-value consumables.
Description
Technical Field
The invention relates to a liquid crystal display device, in particular to a manufacturing method of a polymer bee net liquid crystal display.
Background
For a composite system of a polymer and a liquid crystal, it is known to divide into a polymer dispersed liquid crystal (PDLC: polymer dispersed liquid crystal) and a polymer network liquid crystal (PNLC: polymer network liquid crystal). The polymer dispersed liquid crystal is a polymer with a polymer content of about 30% or more, and the polymer forms a matrix of spherical cavities, dispersing the liquid crystal into small droplets. The polymer network liquid crystal is characterized in that the polymer content is about 15% or less, the liquid crystal forms a matrix, and the polymer forms a wire chain network line which is discretely distributed in the liquid crystal layer. PDLC products which are industrialized and have larger market are applied to be used as electric control dimming films; PNLC products, which have been industrialized and have a relatively large market, are applied as liquid crystal handwriting pads (polymer network stabilized cholesteric liquid crystals). The application of PDLC or PNLC as display is also one new product development direction in industry, and the PDLC or PNLC has scattering state (trans-transparent state) when it has zero electric field and transparent state (trans-transparent state) when it has electric field, and the contrast between scattering state and transparent state is used to form character or graphic display. Although the PDLC or PNLC display has narrow application range and very small market, the PDLC or PNLC display has simple structure, low cost and easy manufacture because the PDLC or PNLC display does not need a polaroid, and has higher development value.
Disclosure of Invention
The invention provides a method for manufacturing a display of a novel polymer and liquid crystal composite system with polymer content between 15 and 30 percent. The invention not only fills the gap in the research field of polymer and liquid crystal composite systems, but also develops a novel display device with a certain application market. Since PDLC and PNLC are already known meaning concepts in the art, it is necessary to give a new name for a new polymer and liquid crystal composite system having a polymer content of between 15 and 30%. It is conceivable that such a content of polymer forms neither a polymer matrix in which the liquid crystal is dispersed nor a discrete, interlaced network, but a sufficiently dense network, or even a connected cell microcavity. As an ideal model, it is assumed that it forms a network similar to a honeycomb network, abbreviated as a "bee network", and thus this new composite system of a polymer and a liquid crystal is called "polymer bee network liquid crystal (PHLC: polymer hive liquid crystal)".
The invention provides a composition of a polymer bee net liquid crystal display, which is characterized in that a low pretilt angle TN liquid crystal box is filled with a mixed liquid of prepolymer and liquid crystal, the content of the prepolymer accounts for 15-30% of the mixed liquid, the prepolymer is a photo-polymerizable monomer which is easy to polymerize along the vertical light beam propagation direction, the liquid crystal is positive nematic liquid crystal, the photo-polymerizable monomer forms a polymer communication pore canal honeycomb network which is distributed along the two-dimensional horizontal lying in the liquid crystal box through vertical incidence collimation light source ultraviolet light exposure, and liquid crystal molecules are in a two-dimensional scattered horizontal lying distribution state along the surface of the liquid crystal box. When no electric field exists, the liquid crystal box presents a scattering state; after application of the electric field, the cell assumes a transparent state. A sharp contrast is formed between the scattering state and the transparent state, thus constituting a character or graphic display. The polymer and liquid crystal composite system proposed in the past is either a PDLC with relatively high polymer content or a PNLC with relatively low polymer content, and is not concerned with a system with the polymer content of about 15-30%, so that the polymer and liquid crystal composite system has innovation in the concept of polymer bee net liquid crystal.
The invention provides a manufacturing method of a polymer bee net liquid crystal display, which comprises the following steps:
firstly, manufacturing a low pretilt angle TN liquid crystal empty box with characters or figures according to a conventional process;
secondly, preparing liquid crystal and prepolymer mixed liquor according to a conventional process;
Thirdly, filling liquid crystal and prepolymer mixed liquid into the empty liquid crystal box according to a conventional process;
And fourthly, exposing ultraviolet light according to a special process, wherein the ultraviolet light is incident on a quasi-vertical plane as a light source.
The liquid crystal display prepared by the steps has the appearance of a scattering fog state glass sheet (or film), and the appearance becomes a display capable of displaying characters or figures after an electric field is applied.
In existing PDLC or PNLC products, it is natural to use a surface light source to separate the uv exposure phase, which is a well known technique in the art. The method for manufacturing the polymer bee net liquid crystal display emphasizes ultraviolet exposure according to a special process, and is characterized in that the light source is a quasi-homeotropic incident ultraviolet. This is based on the recent studies conducted by the present inventors, and it has been found experimentally that some linear monomers have a characteristic of being easily polymerized in a direction perpendicular to the propagation direction of the light beam. Optically, if the beam propagation direction is taken as the z-axis and the perpendicular beam propagation direction is taken as the x-y axis, then some monomers tend to polymerize along the z-direction of the beam propagation, while others tend to polymerize along the x-y direction of the perpendicular beam propagation. Indeed, photopolymerizable monomers are a very large family of organic molecules, and most monofunctional or polyfunctional linear monomers do not possess this property, but such monomers are still experimentally easily found. From the molecular physics point of view, pi electron cloud or sigma electron cloud exists in the organic molecule, and the organic molecule is stable or oscillates under the influence of or without being influenced by polarized light disturbance, so that polymerization or non-polymerization is performed, and further photoinduced directional polymerization reaction occurs. The multifunctional monomer is easily polymerized into a multi-branched polymer. In general, the large-area ultraviolet light source is used in human experiments or production, the propagation direction of the light beam is all directions, and the prepared sample is of course that the polymer filament chains are three-dimensionally scattered, so that the polarization light induced directional polymerization characteristic of certain photopolymerizable monomers is covered.
The invention provides a manufacturing method of a polymer bee net liquid crystal display, which is characterized in that a polarized light-induced directional polymerization monomer is adopted, and a light source is a collimation light source for vertical plane incident ultraviolet exposure, so that the invention has innovations in material and process technical conditions of the manufacturing method. Since the most primitive patents of PDLC or PNLC have failed over thirty years, none of these patents are generally innovations in terms of conceptual connotation, generally only material innovations, as most of them claim a combination system of liquid crystal compositions or polymer components in the claims.
The invention provides an application of a polymer bee net liquid crystal display, which has the characteristics of simple structure, low cost, easy manufacture, low driving voltage and the like, and is suitable for being applied to special display devices of low-value consumable products, such as children toy displays and the like.
Compared with the prior art, the polymer for PDLC generally consists of a mixed solution of various monomers and oligomers, for example, the mixed solution contains isobornyl acrylate (IBOA), lauryl ester (LA), trimethylolpropane triacrylate (TMPTA) and the like; the mixed solution contains polyester acrylate, polyurethane acrylate, epoxy acrylate and the like as the oligomer. The monomers for PNLC are generally polyfunctional linear monomers selected for polymerization into a network. The claims presented by the inventors in the technical background of high molecular materials are generally directed to the general structural formula of liquid crystals or polymers. The invention has the requirement of light-induced directional polymerization monomer perpendicular to the propagation direction of light beam, and the monomer is easy to find in many kinds. Compared with the prior art, in the manufacturing process of PDLC or PNLC products, a large-area ultraviolet light surface light source is adopted, and the collimating vertical plane incident point light source is adopted, so that a collimating diaphragm device is added between the surface light source and the products to achieve the requirement of reforming the surface light source into the collimating vertical plane incident point light source. Compared with the prior art, the patent CN106281361B has very low polymer content, almost can be used, and the homeotropic alignment of negative liquid crystal molecules is restrained by the homeotropic alignment of the liquid crystal box substrate, so that no function of a polymer network can be seen. The polymer cellular liquid crystal display provided by the invention has relatively high density of polymer filament chain networks and tends to be arranged along the surface, and the strong scattering effect of PDLC polymer dispersed liquid crystal microdroplets can be achieved by using a polymer network with a certain concentration.
Drawings
FIG. 1 is a schematic diagram of the principle of the PHLC in the power-on forward scattering state: 1. a top glass substrate; 2. an ITO conductive layer is arranged on the substrate; 3. a low pretilt angle orientation layer; 4. a polymer bee net which is easily arranged in a plane and is horizontally and horizontally oriented in two dimensions; 5. liquid crystal molecules which are easy to be in-plane two-dimensional distribution and horizontally oriented; 6. a lower low pretilt alignment layer (orthogonal to the upper low pretilt alignment layer); 7. a lower ITO conductive layer; 8. and a lower glass substrate.
Fig. 2 is a schematic diagram of the transparent PHLC principle after power-up: 9. a top glass substrate; 10. an ITO conductive layer is arranged on the substrate; 11. a low pretilt angle orientation layer; 12. a polymer bee net which is easily arranged in a plane and is horizontally and horizontally oriented in two dimensions; 13. liquid crystal molecules erected along the electric field direction; 14. a lower low pretilt alignment layer (orthogonal to the upper low pretilt alignment layer); 15. a lower ITO conductive layer; 16. and a lower glass substrate.
Fig. 3 is a schematic diagram of a device for modifying a surface light source into a collimation homeotropic incident point light source: 17. a surface light source of ultraviolet light is arranged; 18. an upper collimating aperture array; 19. an article; 20. a lower collimating aperture array; 21. and a lower ultraviolet light source.
Detailed Description
The invention is illustrated below in connection with specific examples.
Firstly, manufacturing and etching a low pretilt angle TN liquid crystal empty box with cartoon patterns according to a conventional process: the size of the liquid crystal box is 3 multiplied by 4cm 2, the gap between the liquid crystal box is 5 mu m, the pretilt angle of the liquid crystal box is about 1 DEG, the rubbing angles of the upper substrate and the lower substrate of the liquid crystal box are orthogonal, and the thickness of ITO glass is 0.7mm.
Secondly, preparing a liquid crystal and prepolymer mixed solution according to a conventional process: liquid crystal smoke counter bloom company product X3P-1184 (n o＝1.512,ne = 1.722, Δn=0.21); the vertical beam propagation direction is the easy polymerization direction of the long-emerging chemical product EM219 isodecyl acrylate (ISODA, n 1 =1.438), and the high refractive index monomer for adjusting the refractive index of the prepolymer is the long-emerging chemical product EM2209-1 difunctional acrylate monomer (n 2 =1.60-1.61); the mixing ratio of the two monomers is 0.75:0.25 (namely 3 to 1) of EM219 to EM 2209-1; after mixing the two monomers, a small amount of photoinitiator 1173 (about 1% of 2-hydroxy-2-methyl-1-phenyl-1-propanone (HMPP for short) is added, and the mixing ratio of the prepolymer to the liquid crystal is 0.25:0.75 (namely 1 to 3).
Thirdly, filling mixed liquid into the empty liquid crystal box according to a conventional process: the viscosity of the liquid crystal and prepolymer mixture is lower, and the liquid crystal can be easily poured into a liquid crystal box according to the conventional LCD process.
And fourthly, exposing ultraviolet light (light intensity KW/m 2, exposure time length 2 min) according to a special process, wherein the device is characterized in that the light source is incident ultraviolet light in a quasi-vertical plane (the schematic diagram of the device is shown in figure 3).
The liquid crystal display prepared by the steps has the appearance of a scattering fog state glass sheet (also can be a film), can display cartoon patterns after an electric field is applied, and can be used as a low-value consumable display on a toy.
In summary, the above-described embodiments illustrate the present invention in detail, and do not limit the scope of the present invention. Those skilled in the art, having the benefit of this disclosure, may make numerous changes and alterations to the invention without departing from the spirit and scope of the invention.
Claims (3)
1. A polymer cellular liquid crystal display comprising two transparent conductive glass or film sheets and a polymer cellular liquid crystal film;
the polymer is a photopolymerization monomer which is easy to polymerize along the direction perpendicular to the propagation direction of the light beam;
The liquid crystal is a positive nematic liquid crystal;
The content of the polymer is between 15 and 30 percent of the mixed solution;
under the exposure of ultraviolet light of a vertical incidence collimation light source, the photopolymerizable monomers form a honeycomb network of polymer communication pore passages which are distributed along two-dimensional horizontal lying in the liquid crystal box, and liquid crystal molecules are in a two-dimensional scattered horizontal lying distribution state along the surface of the liquid crystal box.
2. A polymer cellular liquid crystal display according to claim 1, wherein the liquid crystal cell assumes a scattering state in the absence of an electric field; after the electric field is applied, the liquid crystal box is in a transparent state; a sharp contrast is formed between the scattering state and the transparent state, thus constituting a character or graphic display.
3. A method of manufacturing a polymer cellular liquid crystal display according to claim 1, comprising the steps of:
Firstly, manufacturing a low pretilt angle empty liquid crystal box with characters or figures according to a conventional process;
secondly, preparing liquid crystal and prepolymer mixed liquor according to a conventional process;
thirdly, pouring mixed liquid into the empty liquid crystal box according to a conventional process;
And fourthly, exposing ultraviolet light according to a special process, wherein the ultraviolet light is incident on a quasi-vertical plane as a light source.
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| US4944576A (en) * | 1988-03-21 | 1990-07-31 | Hughes Aircraft Company | Film with partial pre-alignment of polymer dispersed liquid crystals for electro-optical devices, and method of forming the same |
| DE59403063D1 (en) * | 1993-02-17 | 1997-07-17 | Hoffmann La Roche | Optical component |
| KR20050094011A (en) * | 2004-03-17 | 2005-09-26 | 비오이 하이디스 테크놀로지 주식회사 | Method for aligning polymer network liquid crystal |
| JP4387931B2 (en) * | 2004-12-06 | 2009-12-24 | 九州ナノテック光学株式会社 | Polymer network type liquid crystal display device and manufacturing method thereof |
| JP4651368B2 (en) * | 2004-12-06 | 2011-03-16 | 日本放送協会 | Liquid crystal light modulator manufacturing method, liquid crystal light modulator, and liquid crystal display device |
| JP2009048062A (en) * | 2007-08-22 | 2009-03-05 | Sony Corp | Manufacturing method of liquid crystal display device and liquid crystal display device |
| JP2019135500A (en) * | 2016-06-14 | 2019-08-15 | 三菱ケミカル株式会社 | Liquid crystal element, liquid crystal composition, and screen and display using liquid crystal element |
| CN109884817A (en) * | 2019-04-03 | 2019-06-14 | 扬州晶彩智能玻璃科技有限公司 | A kind of low voltage drive liquid crystal light modulation film and preparation method thereof |
| CN110596961B (en) * | 2019-10-17 | 2021-05-07 | 北京大学 | Electric control light adjusting film and preparation method thereof |
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