CN112180650A - Color electrophoretic display liquid and preparation method thereof - Google Patents
Color electrophoretic display liquid and preparation method thereof Download PDFInfo
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- CN112180650A CN112180650A CN202011003101.6A CN202011003101A CN112180650A CN 112180650 A CN112180650 A CN 112180650A CN 202011003101 A CN202011003101 A CN 202011003101A CN 112180650 A CN112180650 A CN 112180650A
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- G—PHYSICS
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- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/165—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 translational movement of particles in a fluid under the influence of an applied field
- G02F1/166—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 translational movement of particles in a fluid under the influence of an applied field characterised by the electro-optical or magneto-optical effect
- G02F1/167—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 translational movement of particles in a fluid under the influence of an applied field characterised by the electro-optical or magneto-optical effect by electrophoresis
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Abstract
The invention provides a color electrophoretic display liquid, which comprises a solvent, electrophoretic particles suspended in the solvent, a charge control agent for charging the electrophoretic particles and a stabilizer, wherein the mass fraction of the electrophoretic particles is 10% -50%, the mass fraction of the charge control agent is 0.1% -1.8%, the mass fraction of the solvent is 48% -88%, the mass fraction of the stabilizer is 0.1% -1%, and the electrophoretic particles comprise white electrophoretic particles and at least one color electrophoretic particle. The prepared color electrophoretic display liquid has high success rate and excellent electric field responsiveness under the driving of an electric field.
Description
Technical Field
The invention relates to the field of electrophoretic display, in particular to a color electrophoretic display liquid and a preparation method thereof.
Background
The electronic paper is an electrophoretic display, has the paper-like properties of lightness, thinness, softness, folding, bending and portability, has the advantages of wide visual angle, high contrast, large capacity and renewability, and makes positive contribution to the improvement of the earth ecology by the characteristics of low cost, economy and environmental protection. And the electronic paper only needs to consume power when the picture is replaced, has the advantage of ultralow power consumption, and simultaneously protects eyes comfortably, does not have blue light, and is still clearly visible under strong light. Due to the excellent characteristics of the electronic paper, the electronic paper can be applied to the electronic book reader market, and has wide application prospects in the aspects of electronic shelf labels, bus station display screens and the like. Importantly, with the combination of electronic paper and two major information technology elements, namely digitization and the internet, the traditional paper media and the industry chain thereof are deeply affected. With the continuous expansion of the application field, the color electronic paper is produced, and by means of rich colors and striking contrast, the eye-catching effect can be increased for advertisement propaganda and commodity sales promotion information, so that the color electronic paper is suitable for commercial situations such as retail stores, department stores and the like, and provides a new choice for commercial advertisement display screens.
The development of electronic paper has been important for more than ten years, from black and white to black and white red and black and yellow to the current full-color electronic paper. Inorganic colored particles generally have high density and low degree of coloration, the preparation process is complex, multi-step reaction is needed for surface modification to reduce the density of the inorganic colored particles, the particles can be better dispersed in an electrophoretic solution, the whole process is complex, the process tolerance is low, the requirement on the quality of operators is high, and the inorganic colored particles are not suitable for industrial production in an amplification way. The organic pigment particles have high degree of coloration and low density, and do not need too much modification to meet the density requirement. However, the organic pigment particles are generally inert structures and are difficult to charge, so most preparation strategies are to coat the surfaces with silicon and charge the surfaces by the action of charge control agents. However, the strategy is also complex in process and is not suitable for industrial production amplification. Therefore, it is very important to develop a simple and practical method for preparing electrophoretic particles of organic pigments.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the current preparation of the color electrophoretic display liquid has the problems of complex process and low success rate.
In order to solve the technical problems, the invention adopts the technical scheme that:
the invention provides a color electrophoretic display fluid, which comprises at least one solvent, electrophoretic particles suspended in the solvent, at least one charge control agent and a stabilizer, wherein the charge control agent is used for charging the electrophoretic particles, the electrophoretic particles account for 10-50% by mass, the charge control agent accounts for 0.1-1.8% by mass, the solvent accounts for 48-88% by mass, the stabilizer accounts for 0.1-1% by mass, and the electrophoretic particles comprise white electrophoretic particles and at least one color electrophoretic particle.
Further, the color electrophoretic particles and the white particles have the same/different charges.
Further, the color electrophoretic particles are particles without surface modification or grafted particles.
Further, the colored electrophoretic particles are particles prepared by grinding colored organic pigments and charge control agents.
Further, the ratio of the colored electrophoretic particles to the white electrophoretic particles is 1: 3-10.
Further, the electrophoretic particles may be particles whose surfaces are not modified, particles whose surfaces are modified with polymers, or particles whose surfaces are modified with inorganic substances.
Further, the charge control agent includes at least one of an organic compound having a functional group, a polymer compound having a functional group, an anionic surfactant, a cationic surfactant, and a nonionic surfactant, and the functional group is a dissociable functional group or a neutral group having a strong polarity.
Further, the solvent includes at least one of alkane, epoxy compound, aromatic compound, halogenated hydrocarbon and its oligomer, fluorine-containing organic solvent.
The invention provides a method for preparing the color electrophoretic display liquid, which is characterized by comprising the following steps:
the electrophoretic particles, the charge control agent and the stabilizer are added into a solvent according to a certain proportion, and are uniformly mixed to prepare electrophoretic display liquid, wherein the electrophoretic particles are synthesized white electrophoretic particles with a modified layer and color electrophoretic particles with unmodified surfaces.
Further, the method comprises a step of synthesizing the white electrophoretic particles with the modification layer, wherein the step of synthesizing the white electrophoretic particles with the modification layer comprises the following steps:
carrying out coupling agent treatment on the surfaces of the electrophoretic particles;
and (3) combining the polymer with the functional group of the coupling agent in a covalent bond mode, and further grafting the polymer to the surface of the white electrophoretic particle to obtain the white electrophoretic particle with the modified layer.
The invention has the beneficial effects that: the electrophoretic particle comprises 10-50% by mass of at least one solvent, 0.1-1.8% by mass of at least one charge control agent and 48-88% by mass of at least one stabilizer, wherein the electrophoretic particle comprises white electrophoretic particles and at least one colored electrophoretic particle, and the charge control agent is suspended in the solvent, and the stabilizer cannot generate ionization in the solvent. The prepared color electrophoretic display liquid has high success rate and excellent electric field responsiveness under the driving of an electric field.
Detailed Description
The experimental procedures used in the following examples are all conventional procedures unless otherwise specified.
Materials, reagents and the like used in the following examples are commercially available unless otherwise specified.
Example 1: color electrophoretic display liquid
The composite material comprises the following components in percentage by mass:
10% of electrophoretic particles, 1.3% of charge control agent, 88% of solvent and 0.7% of stabilizing agent.
Example 2: color electrophoretic display liquid
The composite material comprises the following components in percentage by mass:
20% of electrophoretic particles, 1% of charge control agent, 78% of solvent and 1% of stabilizer.
Example 3: color electrophoretic display liquid
The composite material comprises the following components in percentage by mass:
35% of electrophoretic particles, 0.5% of charge control agent, 64% of solvent and 0.5% of stabilizing agent.
Example 4: color electrophoretic display liquid
The composite material comprises the following components in percentage by mass:
45% of electrophoretic particles, 1.5% of charge control agent, 52.8% of solvent and 0.7% of stabilizing agent.
Example 5: color electrophoretic display liquid
The composite material comprises the following components in percentage by mass:
50% of electrophoretic particles, 1.8% of charge control agent, 48% of solvent and 0.2% of stabilizing agent.
The color electrophoretic particles are prepared by a grinding method, the method is simple and easy to operate, and the success rate of the experiment and the process tolerance are high; the preparation method does not influence the degree of coloration, the charge quantity of the colored particles is controllable, and the prepared electrophoretic solution has quick response and good coloring effect under an electric field. The prepared color electrophoretic display liquid has excellent electric field responsiveness under the driving of an electric field. The content of the electrophoretic particles in the electrophoretic display liquid is 20-50%, preferably 25-45%.
Further, the stabilizer is a polyolefin or a block polymer. The molecular weight of the polyene stabilizer is 12w-120w, and the addition amount is 0.5% -1%; the block polymer contains polystyrene block and is added in the amount of 0.1-0.6%.
Further, the color electrophoretic particles and the white particles have the same/different charges. The colored electrophoretic particles are particles without surface modification or grafted particles.
Specifically, the white electrophoretic particles in this embodiment may be single pigment or composite pigment (inorganic and inorganic composite, organic and inorganic composite, inorganic and polymer composite, organic and polymer composite, etc.) particles. Common white particles include TiO2、SiO2CaO, BaS, ZnO, or the like, and the electrophoretic particles in the present example are particles whose surfaces are modified with a polymer or an inorganic substance. The color electrophoretic particles are prepared by a simple one-step grinding method.
Specifically, the white electrophoretic particles are white pigment particles with polymer-modified surfaces, and the colored particles are organic pigment particles without polymer or inorganic substance modification.
It should be understood that the principle of electrophoretic display is that one or more electrophoretic particles are dispersed in a solvent, and the electrophoretic particles may be charged or uncharged, and may be charged with the same charge or different charges. Under the action of an applied electric field, the charged particles will move directionally along the direction of the electric field, so that the electrophoretic particles with different surface charges are gathered at different positions in the system, and the display will display the color of the particles nearest to the electrodes. By matching the electrophoretic particles with different colors with the solvent and applying different external electric fields, the electrophoretic display can display different colors.
Further, the colored electrophoretic particles are particles prepared by grinding colored organic pigments and charge control agents.
Specifically, the color electrophoretic particles in this embodiment are organic pigment particles, and are prepared by a simple grinding method without grafting other polymers. Useful organic pigment particles include, but are not limited to, c.i. pigment red 9,19,38,43,97,122,123,144,149,166,168,177,179,180,192, 208,215,216,217,220,223,224,226,227,228,240,254,255,264, 270; c.i. pigment blue 15,15:6,16,22,29,60, 64; c.i. pigment green 7,36, 56; pigment yellow 20,24,86,81,83,93,108,109,110,117,125,137,138,139, 147,148,150,153,154,166,168, 185.
Further, the ratio of the colored electrophoretic particles to the white electrophoretic particles is 1: 3-10.
Further, the electrophoretic particles may be particles whose surfaces are not modified, particles whose surfaces are modified with polymers, or particles whose surfaces are modified with inorganic substances.
Specifically, the color electrophoretic particles are organic electrophoretic particles without surface modification.
Further, the charge control agent includes at least one of an organic compound having a functional group, a polymer compound having a functional group, an anionic surfactant, a cationic surfactant, and a nonionic surfactant, and the functional group is a dissociable functional group or a neutral group having a strong polarity. The charge control agent is ionic or non-ionic, and the white electrophoretic particles and the colored electrophoretic particles can share one charge control agent, or different charge control agents are selected from different particles. The amount of the charge control agent is 0.1-1.8%, preferably 0.2-1.0%.
Specifically, it should be understood that the charge control agent can be adsorbed on the surface of the electrophoretic particles to charge the electrophoretic particles, and can generate electrophoresis under the action of an external electric field. The charge control agent should have three conditions: first, it can be ionized in organic solvents; secondly, one ionized ion can be preferentially adsorbed on the surface of the solid particle; thirdly, the free ions in the solution must be reduced to the minimum to reduce the conductance of the free ions and save the electric energy.
It is to be understood that charge control agents for the colored electrophoretic particles are typically added during milling, including, but not limited to, Solsperse 11000,11200,13000,13300,13940,16000,17000, 19000; WinSperse 3010A,3020,3030,3100.
The charge control agent in this example is an organic compound having a functional group, a polymer compound having a functional group, a copolymer polymer compound having a functional group, an anionic surfactant, a cationic surfactant, and a nonionic surfactant. The functional group in the organic compound having a functional group, the polymer compound having a functional group, and the copolymer polymer compound having a functional group is a dissociable functional group. The charge control agent having a dissociable functional group includes various organic acid salts, organic ammonium salts, amide compounds, organic zwitterionic compounds, and the like, and corresponding organic acids, organic ammonium compounds, and the like.
It should be understood that many of the currently used high molecular or copolymer compounds having functional groups include OLOA series such as OLOA371, OLOA1200 and OLOA11000 manufactured by Orinite, usa, and Solsperse hyperdispersant series such as Solsperse 8000, 9000, 13940,16000,17000, 18000, 21000, 24000, usa. Wherein the OLOA series is polyisobutylene modified by succinimide, and the Solsperse series is a compound with an anchoring group containing amine and a solvation chain being low-polarity or non-polar aliphatic hydrocarbon.
Further, the solvent includes at least one of alkane, epoxy compound, aromatic compound, halogenated hydrocarbon and its oligomer, fluorine-containing organic solvent.
Specifically, the solvent in this embodiment is an alkane, an epoxy compound, an aromatic compound, a halogenated hydrocarbon and its oligomer, or a fluorine-containing organic solvent, and the solvent may be one or more of the above mixtures.
The invention provides a method for preparing the color electrophoretic display liquid, which comprises the following steps:
the electrophoretic particles, the charge control agent and the stabilizer are added into the solvent according to the proportion and are uniformly mixed to prepare the electrophoretic display liquid, and the electrophoretic particles are synthesized into white electrophoretic particles with a modified layer and colored electrophoretic particles with unmodified surfaces.
The method also comprises a step of synthesizing the white electrophoretic particles with the modification layer, and the step of synthesizing the white electrophoretic particles with the modification layer comprises the following steps:
carrying out coupling agent treatment on the surfaces of the electrophoretic particles;
and (3) combining the polymer with the functional group of the coupling agent in a covalent bond mode, and further grafting the polymer to the surface of the electrophoretic particle to obtain the electrophoretic particle with the modification layer.
Specifically, the step of preparing the color electrophoretic display solution is S1, performing coupling agent treatment on the surfaces of the white electrophoretic particles;
s2, combining the polymer with the functional group of the coupling agent in a covalent bond mode, and further grafting the polymer to the surface of the electrophoretic particle to obtain the electrophoretic particle with a modified layer;
and S3, grinding the color pigment particles to prepare the charged color electrophoretic particles.
S3, adding the white electrophoretic particles with the modification layer, the charged colored electrophoretic particles, the charge control agent and the stabilizer into a solvent to prepare the colored electrophoretic display liquid.
The present invention will be described in detail below with reference to specific examples. The scope of the present invention is not limited to the following examples.
Example 1: pigment yellow 168 was used to prepare charged yellow electrophoretic particles, which were combined with titanium dioxide white electrophoretic particles to prepare an electrophoretic fluid.
In the first step, white electrophoretic particles are prepared. Preparing a three-mouth bottle, adding a certain amount of water and a silane coupling agent, adding titanium dioxide particles, and stirring and mixing uniformly at normal temperature. The system was then stirred for half an hour at ambient temperature. After the reaction is finished, transferring the solution in the three-mouth bottle into a centrifugal bottle, cleaning, and transferring into a crystallizing dish for vacuum drying;
the dried white solid was pulverized and redispersed in toluene. Preparing a 1L three-mouth bottle, adding white particles dispersed in toluene, adding a certain amount of organic monomer, finally adding a certain amount of toluene, and stirring at normal temperature for 1h to obtain a white turbid liquid. The system was then warmed to 70 ℃ and the initiator was added slowly dropwise, and the reaction was allowed to incubate at this temperature overnight. After the heat preservation is finished, when the temperature of the system is reduced to the room temperature, the grafted white particles are cleaned and stored for later use.
And secondly, preparing the color electrophoretic particles. The preparation process of the colored electrophoretic particles is very simple, firstly, the charge control agent Solsperse 13300 is uniformly dispersed in a solvent, the dispersed solution is added into a grinding cylinder, stirring is started, then, a certain amount of C.I. pigment yellow 168 is weighed and added into the grinding cylinder, a certain amount of zirconium beads are added, and grinding is started. After the grinding is finished, the colored particles are taken out, repeatedly washed for several times, and finally re-dispersed in the solvent for storage.
And thirdly, preparing a three-mouth bottle, adding the grafted titanium dioxide particles and the ground yellow electrophoretic particles into the three-mouth bottle, adding a certain amount of a charge control agent Solsperse17000, and selecting a stabilizer G1701 produced by Kraton company in the United states as the stabilizer to obtain the color electrophoretic display liquid.
In this embodiment, the white electrophoretic particles are particles whose surfaces are modified by polymers or inorganic substances, which can reduce the particle density to make the particles better suspended in the solvent; on the other hand, the polymer can be stretched around the particles to form steric hindrance, and the particles are prevented from being aggregated, so that stable dispersion of the particles is realized, and the stability of the electrophoretic display liquid is further improved. In addition, the charge control agent comprises a high molecular compound containing a functional group and a copolymerized high molecular compound containing a functional group, wherein the compound comprises an anchoring group and a polymer solvation chain, and can not only charge the particles, but also adsorb the particles on the surfaces of the particles to form steric hindrance, so that the particles are stably dispersed in the solvent, and the stability of the electrophoretic display liquid is further improved.
Example 2: magenta pigment particles were prepared using pigment red c.i.122 and formulated with white particles into an electrophoretic fluid.
The white electrophoretic particles in this embodiment may be single pigment or composite pigment (inorganic and inorganic composite, organic and inorganic composite, inorganic and polymer composite, organic and polymer composite, etc.) particles. The white pigment particles comprise TiO2、SiO2CaO, BaS, ZnO, or the like.
The white electrophoretic particles in this example are titanium dioxide particles with polymer-modified surfaces.
In the first step, white electrophoretic particles are prepared. Adding a certain amount of water and a silane coupling agent into a three-mouth bottle, adding a certain amount of white particles, and stirring and mixing uniformly at normal temperature. The system was then incubated and stirring was continued. After the heat preservation is finished, transferring the solution in the three-mouth bottle into a centrifugal bottle, and washing and drying the solution;
the dried white solid was then ground, dispersed in toluene and washed three times for use. A three-necked flask was prepared, and white particles dispersed in toluene were added thereto, followed by addition of an organic monomer. Then stirring at normal temperature, and obtaining a white turbid liquid. The system is then warmed up and initiator is added for reaction. And after the reaction is finished, cleaning the grafted white particles, and storing for later use.
And secondly, preparing magenta electrophoretic particles. First, the charge control agent Solsperse 13300 is uniformly dispersed in a solvent, the dispersed solution is added into a grinding cylinder, stirring is started, then, a certain amount of c.i. pigment red 122 is weighed into the grinding cylinder, a certain amount of zirconium beads is added, and grinding is started. After grinding, the particles are taken out, cleaned and re-dispersed in a solvent for storage.
And step three, preparing a three-neck bottle, adding the white particles containing organic matter grafting and the ground magenta pigment particles into a solvent, and adding a charge control agent Solsperse17000 and a stabilizer polyisobutene to obtain the color electrophoretic display liquid.
In summary, the color electrophoretic display fluid provided by the present invention comprises at least one solvent, electrophoretic particles suspended in the solvent, at least one charge control agent for charging the electrophoretic particles, and a stabilizer incapable of generating ionization in the solvent, wherein the electrophoretic particles comprise 10% to 50% by mass, the charge control agent comprises 2% to 15% by mass, the solvent and the stabilizer comprise 48% to 88% by mass, and the stabilizer is a polyene or a block polymer. The prepared color electrophoretic display liquid has high success rate and excellent electric field responsiveness under the driving of an electric field. The invention also provides a method for preparing the color electrophoretic display liquid, the color electrophoretic particles are prepared by a grinding method, the method is simple and easy to operate, and the success rate of experiments and the process tolerance are high; the preparation method does not influence the degree of coloration, the charge quantity of the colored particles is controllable, and the prepared electrophoretic solution has quick response and good coloring effect under an electric field. The method has simple process and high success rate.
The first … … and the second … … are only used for name differentiation and do not represent how different the importance and position of the two are.
Here, the upper, lower, left, right, front, and rear merely represent relative positions thereof and do not represent absolute positions thereof
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by the present specification, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. The color electrophoretic display liquid is characterized by comprising a solvent, electrophoretic particles suspended in the solvent, a charge control agent for charging the electrophoretic particles and a stabilizer, wherein the mass fraction of the electrophoretic particles is 10% -50%, the mass fraction of the charge control agent is 0.1% -1.8%, the mass fraction of the solvent is 48% -88%, the mass fraction of the stabilizer is 0.1% -1%, and the electrophoretic particles comprise white electrophoretic particles and at least one color electrophoretic particle.
2. The color electrophoretic display fluid of claim 1, wherein: the colored electrophoretic particles and the white particles have the same/different charges.
3. The color electrophoretic display fluid of claim 2, wherein: the colored electrophoretic particles are particles without surface modification or grafted particles.
4. The color electrophoretic display fluid of claim 2, wherein: the colored electrophoretic particles are particles prepared by grinding colored organic pigments and charge control agents.
5. The color electrophoretic display fluid of claim 2, wherein: the ratio of the colored electrophoretic particles to the white electrophoretic particles is 1: 3-10.
6. The color electrophoretic display fluid of claim 1, wherein: the electrophoretic particles are particles with unmodified surfaces, particles with modified surfaces of polymers or particles with modified inorganic substances.
7. The color electrophoretic display fluid of claim 1, wherein: the charge control agent comprises at least one of an organic compound containing a functional group, a high molecular compound containing a functional group, an anionic surfactant, a cationic surfactant and a nonionic surfactant, wherein the functional group is a dissociable functional group or a neutral group with polarity.
8. The color electrophoretic display fluid of claim 1, wherein: the solvent comprises at least one of alkane, epoxy compound, aromatic compound, halogenated hydrocarbon and oligomer thereof, and fluorine-containing organic solvent.
9. A method of preparing a color electrophoretic display fluid according to any one of claims 1 to 8, comprising the steps of:
the electrophoretic particles, the charge control agent and the stabilizer are added into a solvent according to a certain proportion, and are uniformly mixed to prepare electrophoretic display liquid, wherein the electrophoretic particles are synthesized white electrophoretic particles with a modified layer and color electrophoretic particles with unmodified surfaces.
10. The method of claim 9, wherein: the method also comprises a step of synthesizing the white electrophoretic particles with the modification layer, and the step of synthesizing the white electrophoretic particles with the modification layer comprises the following steps:
carrying out coupling agent treatment on the surfaces of the electrophoretic particles;
and (3) combining the polymer with the functional group of the coupling agent in a covalent bond mode, and further grafting the polymer to the surface of the white electrophoretic particle to obtain the white electrophoretic particle with the modified layer.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101738814A (en) * | 2009-11-11 | 2010-06-16 | 广州奥翼电子科技有限公司 | Electrophoresis disclosing solution and preparation method thereof |
| CN102213888A (en) * | 2010-02-08 | 2011-10-12 | 天津大学 | Preparation method of electrophoretic display solution |
| US20170137632A1 (en) * | 2011-02-03 | 2017-05-18 | E Ink California, Llc | Methods for modifying zeta potential of electrophoretic particles |
| CN110231744A (en) * | 2019-07-17 | 2019-09-13 | 深圳秋田微电子股份有限公司 | A kind of electrophoretic display device (EPD), electrophoresis showed mould group and preparation method thereof |
| CN111273499A (en) * | 2020-03-27 | 2020-06-12 | 深圳秋田微电子股份有限公司 | Electrophoretic display liquid with stable state and preparation method thereof |
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2020
- 2020-09-22 CN CN202011003101.6A patent/CN112180650A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101738814A (en) * | 2009-11-11 | 2010-06-16 | 广州奥翼电子科技有限公司 | Electrophoresis disclosing solution and preparation method thereof |
| CN102213888A (en) * | 2010-02-08 | 2011-10-12 | 天津大学 | Preparation method of electrophoretic display solution |
| US20170137632A1 (en) * | 2011-02-03 | 2017-05-18 | E Ink California, Llc | Methods for modifying zeta potential of electrophoretic particles |
| CN110231744A (en) * | 2019-07-17 | 2019-09-13 | 深圳秋田微电子股份有限公司 | A kind of electrophoretic display device (EPD), electrophoresis showed mould group and preparation method thereof |
| CN111273499A (en) * | 2020-03-27 | 2020-06-12 | 深圳秋田微电子股份有限公司 | Electrophoretic display liquid with stable state and preparation method thereof |
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Application publication date: 20210105 |