CN117471809A - Charge-controllable black-and-white electrophoresis display system and preparation method thereof - Google Patents
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- 238000001962 electrophoresis Methods 0.000 title claims abstract description 34
- 238000002360 preparation method Methods 0.000 title abstract description 9
- 239000002245 particle Substances 0.000 claims abstract description 114
- 239000007788 liquid Substances 0.000 claims abstract description 43
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims abstract description 34
- 239000004094 surface-active agent Substances 0.000 claims abstract description 27
- DALUDRGQOYMVLD-UHFFFAOYSA-N iron manganese Chemical compound [Mn].[Fe] DALUDRGQOYMVLD-UHFFFAOYSA-N 0.000 claims abstract description 24
- 239000004408 titanium dioxide Substances 0.000 claims abstract description 17
- 239000002612 dispersion medium Substances 0.000 claims abstract description 15
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 claims abstract description 12
- 239000011737 fluorine Substances 0.000 claims abstract description 12
- 229910052731 fluorine Inorganic materials 0.000 claims abstract description 12
- 239000007787 solid Substances 0.000 claims abstract description 8
- 239000002270 dispersing agent Substances 0.000 claims description 14
- 238000002156 mixing Methods 0.000 claims description 14
- 238000000498 ball milling Methods 0.000 claims description 10
- NBVXSUQYWXRMNV-UHFFFAOYSA-N fluoromethane Chemical group FC NBVXSUQYWXRMNV-UHFFFAOYSA-N 0.000 claims description 9
- 229920000058 polyacrylate Polymers 0.000 claims description 9
- CNPVJWYWYZMPDS-UHFFFAOYSA-N 2-methyldecane Chemical compound CCCCCCCCC(C)C CNPVJWYWYZMPDS-UHFFFAOYSA-N 0.000 claims description 6
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 claims description 5
- -1 butadiene imine Chemical class 0.000 claims description 4
- KAKZBPTYRLMSJV-UHFFFAOYSA-N vinyl-ethylene Natural products C=CC=C KAKZBPTYRLMSJV-UHFFFAOYSA-N 0.000 claims description 4
- 239000006229 carbon black Substances 0.000 claims description 3
- 238000000034 method Methods 0.000 claims description 2
- 229920000642 polymer Polymers 0.000 claims 1
- 239000003795 chemical substances by application Substances 0.000 abstract description 17
- 239000002105 nanoparticle Substances 0.000 description 16
- 229910000616 Ferromanganese Inorganic materials 0.000 description 9
- 230000000694 effects Effects 0.000 description 9
- 238000002310 reflectometry Methods 0.000 description 9
- 239000011324 bead Substances 0.000 description 8
- 238000000227 grinding Methods 0.000 description 8
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 description 8
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 8
- 229910001928 zirconium oxide Inorganic materials 0.000 description 8
- 239000000693 micelle Substances 0.000 description 7
- 230000004044 response Effects 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 239000006185 dispersion Substances 0.000 description 5
- 230000001276 controlling effect Effects 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 238000009835 boiling Methods 0.000 description 2
- 239000003086 colorant Substances 0.000 description 2
- 230000005684 electric field Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- KZNICNPSHKQLFF-UHFFFAOYSA-N succinimide Chemical compound O=C1CCC(=O)N1 KZNICNPSHKQLFF-UHFFFAOYSA-N 0.000 description 2
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000000306 component Substances 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 238000007323 disproportionation reaction Methods 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 231100000053 low toxicity Toxicity 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000011572 manganese Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229960002317 succinimide Drugs 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
Classifications
-
- 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
- G02F1/165—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
-
- 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
- G02F1/165—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
- G02F1/1675—Constructional details
- G02F2001/1678—Constructional details characterised by the composition or particle type
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- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Molecular Biology (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Electrochromic Elements, Electrophoresis, Or Variable Reflection Or Absorption Elements (AREA)
Abstract
The invention discloses a black-and-white electrophoresis display system with adjustable and controllable charges and a preparation method thereof, wherein the system comprises: isopar series electrophoretic dispersion medium, white electrophoretic particles with 5-50% of particle solid content, black electrophoretic particles with 1-20% of particle solid content, macromolecular surfactant with 2-20% of concentration of electrophoretic particles, and fluorine-containing surfactant with 3-30% of concentration of electrophoretic particles. The invention adopts the black-and-white electrophoresis display system with adjustable charges and the preparation method thereof, takes isoparaffin series as a dispersion medium, titanium dioxide particles as white electrophoresis display particles, iron-manganese black as black electrophoresis particles, a macromolecular surfactant and a fluorine-containing surfactant as charge control agents, and forms a double-particle system electrophoresis display liquid by the dispersion medium, the electrophoresis particles and the charge control agents, wherein the charges of the electrophoresis display particles can be controlled by the charge control agents, and the charge quantity of the surfaces of the electrophoresis display particles can be controlled by controlling the quantity of the charge control agents adsorbed to the surfaces of the particles.
Description
Technical Field
The invention relates to the technical field of electrophoretic display, in particular to a black-and-white electrophoretic display system with adjustable and controllable charges and a preparation method thereof.
Background
Display technologies include cathode ray tube displays, liquid crystal displays, plasma displays, organic electroluminescent displays, electrowetting displays, electrophoretic displays, and the like. The electrophoretic display technology is proposed in about 70 of the 20 th century, and is widely focused on and then applied to scenes such as electronic books, electronic tags and the like due to the characteristics of near zero power consumption, environmental friendliness, flexible display and the like. The electrophoretic display uses the principle of electrophoresis to make the charged particles with different colors and charge properties between the two electrode plates move under the action of the electric field, and the motion state of the charged particles changes along with the change of the electric field so as to display different colors.
Electrophoretic dispersions are the core component of electrophoretic displays, which are generally relatively stable nonaqueous systems, and are colloidal suspensions composed of a plurality of components, such as dispersion media, color charged particles, and charge control agents. The composition of the electrophoretic display liquid and the physical characteristics thereof have direct influence on the effect and performance of the electrophoretic display, and are one of the performance factors of the display effect such as contrast, reflectivity, response speed, display life and the like, the performance such as long-term storage stability and the like of the electrophoretic display device. The movement conditions of the particles with different charge amounts in the dispersion medium are quite different, so that the surface charge of the electrophoretic particles has a direct influence on the electrophoretic display effect, and is important to control the surface charge of the electrophoretic particles.
Disclosure of Invention
The invention aims to provide a black-and-white electrophoresis display system with adjustable charges and a preparation method thereof, and the size of charges on the surfaces of electrophoresis particles is controlled by controlling the amount of charge control agents adsorbed on the surfaces of the particles.
In order to achieve the above object, the present invention provides a black-and-white electrophoretic display system with adjustable electric charge, comprising: isopar series electrophoretic dispersion medium, white electrophoretic particles with 5-50% of particle solid content, black electrophoretic particles with 1-20% of particle solid content, macromolecular surfactant with 2-20% of concentration of electrophoretic particles, and fluorine-containing surfactant with 3-30% of concentration of electrophoretic particles.
Isopar series isoparaffins have higher boiling points and lower volatility, lower dielectric constants, lower conductivities, good optical and chemical stability, proper viscosity, low toxicity and environmental friendliness. In Isopar series, each reagent has physical differences such as boiling point, melting point, flash point, and viscosity.
Preferably, the Isopar series dispersion medium is one of Isopar B, isopar E, isopar G, isopar H, isopar L and Isopar M.
Preferably, the white electrophoretic particles are titanium dioxide particles, and the black electrophoretic particles are carbon black or iron-manganese black particles; black electrophoretic particles: the mass ratio of the white electrophoretic particles is 1:2-1:20. When the duty ratio of the white particles relative to the black particles is improper, the covering power of the white particles and the black particles is weaker, the positive charge and the negative charge are greatly different, and the optical performance of the device is affected.
Preferably, the polymeric surfactant is T161, T154, T152, T151 in butadiene imine dispersant or Solsperse 3000, solsperse 8000, solsperse13300, solsperse 17000, solsperse 19000 in polydodecyl stearate dispersant.
Preferably, the fluorine-containing surfactant is fluorocarbon modified polyacrylate or fluorocarbon block polyacrylate.
The preparation method of the charge-controllable black-and-white electrophoretic display system comprises the following steps:
s1, respectively mixing titanium dioxide white electrophoresis particles and iron-manganese black electrophoresis particles with a macromolecular surfactant and Isopar series electrophoresis dispersion medium, and ball milling for 2-48 hours to obtain a white electrophoresis display liquid and a black electrophoresis display liquid;
s2, mixing the black electrophoretic display liquid and the white electrophoretic display liquid according to the black electrophoretic display liquid: mixing the white electrophoretic liquid with the mass ratio of 1:2-1:20, adding the fluorine-containing surfactant, and uniformly mixing to obtain the mixed electrophoretic display liquid.
The solid content of titanium dioxide in the white electrophoretic display liquid adopted by the invention is 5-50%, and the solid content of carbon black particles in the iron-manganese black electrophoretic display liquid is 1-20%. If the concentration of the electrophoretic particles is too low, the proportion of the electrophoretic display liquid particles is too small, and the self-covering property is insufficient; when the total particle ratio is too large, the inter-particle distance is too small, and the particle movement is affected.
Based on the dispersion stability, display effect and surface charge difference of electrophoretic particles of an electrophoretic display system, the charge control agent adopted by the invention is a macromolecular surfactant butadiene imine dispersant (T161, T154, T152 and T151) or a polydodecyl stearate dispersant (Solsperse 3000, solsperse 8000, solsperse13300, solsperse 17000 and Solsperse 19000) and a fluorine-containing surfactant (fluorocarbon modified polyacrylate and fluorocarbon block polyacrylate). The polydodecyl stearate dispersing agent and the succinimide dispersing agent have stronger active polar heads and longer solvated chains, can improve the dispersion stability of particles while regulating and controlling the surface charge quantity of the electrophoretic particles, and are beneficial to improving the display effects such as response speed and the like. The fluorine-containing surfactant can increase the surface charge of particles, and has obvious effect on improving response speed.
The concentration of the charge control agent is 2-30% of the concentration of the electrophoretic particles, the concentration of the surfactant on the surfaces of the particles is relatively insufficient when the dosage is too small, the reservoir of the surfactant is exhausted, and the generated reverse micelle is relatively less, so that the electric quantity on the surfaces of the particles is smaller and the dispersion stability of the electrophoretic liquid is poor; when the dosage is moderate, the concentration of the charge control agent slightly rises relative to the surface of the particles to be more sufficient, the number of reverse micelles of the surfactant is increased, the possibility of collision is increased, and according to the reverse micelle disproportionation charging theory, the possibility of charged micelle generation is greatly increased, so that the possibility of obtaining larger electrical property on the surface of the particles is increased; when the amount is too large, the number of reverse micelles on the particle surface is further increased, and surfactant micelles in the solution gradually reaching saturation are further increased, so that the charged particles are shielded due to the too high reverse micelle concentration in the solution to cause the reduction of electric quantity. The charges of the titanium dioxide white particles and the ferro-manganese black particles can be controlled between-11.06 mv and-25.78 mv and between-15.58 mv and-52.81 mv respectively by using the butadiene imine dispersing agent. The charge of the titanium dioxide white particles and the iron-manganese black particles can be controlled between-25.06 mv and-44.50 mv and between 1.78mv and 10.87mv respectively by using the polydodecyl stearate dispersing agent.
Therefore, the invention adopts the black-and-white electrophoresis display system with adjustable charges and the preparation method thereof, takes isoparaffin series as a dispersion medium, titanium dioxide particles as white electrophoresis display particles, iron-manganese black as black electrophoresis particles, a high molecular surfactant and a fluorine-containing surfactant as charge control agents, and forms double-particle electrophoresis display liquid by the dispersion medium, the electrophoresis particles and the charge control agents, wherein the charges of the electrophoresis display particles can be controlled by the charge control agents, and the charge quantity of the surfaces of the electrophoresis display particles can be controlled by controlling the quantity of the charge control agents adsorbed to the surfaces of the particles.
The technical scheme of the invention is further described in detail through the drawings and the embodiments.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It will be apparent to those of ordinary skill in the art that the drawings in the following description are exemplary only and that other implementations can be obtained from the extensions of the drawings provided without inventive effort.
FIG. 1 is a graph showing the surface charge of white particles prepared under the condition of adding different concentrations and different types of dispersants in examples one to eight;
FIG. 2 is a graph showing the surface charge of black particles prepared with different concentrations of different types of dispersants added;
FIG. 3 is a schematic diagram of a prototype display;
fig. 4 is a black state and white state diagram of a prototype electrophoretic display device according to embodiments six to eight;
fig. 5 is a response speed curve based on embodiment eight.
Detailed Description
The technical scheme of the invention is further described below through the attached drawings and the embodiments.
Unless defined otherwise, technical or scientific terms used herein should be given the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs.
The original display devices in the following embodiments are: two conductive glass sheets with the size of 100mm multiplied by 0.7mm are separated by an insulating film with the size of 100mm multiplied by 100mm and the thickness of 50 mu m, a square opening with the size of 22mm multiplied by 22mm is arranged in the middle and used as a display window, the dispersion liquid is poured into the display window, and then the conductive glass is connected with a power supply by a conductive clamp. A schematic diagram of the prototype display device fabrication is shown in fig. 3.
Example 1
Into a 100mL ball-milling bottle, 10mL Isopar G, 0.01G T131 and 0.75G TiO were added 2 The nano particles or 0.50g of ferromanganese black nano particles are ground for 12 hours at the rotating speed of 500r/min by taking 1mm zirconium oxide beads as grinding media, so that white or black electrophoretic display liquid is respectively prepared. At this concentration, the charge value of the titanium dioxide electrophoretic particles was-28.65 mv, and the charge value of the iron-manganese black electrophoretic particles was-16.98 mv.
Example two
Into a 100mL ball-milling bottle, 10mL Isopar M, 0.06g T154, and 1.25g TiO were added 2 The nano particles or 0.75g of ferromanganese black nano particles are ground for 12 hours at the rotating speed of 500r/min by taking 1mm zirconium oxide beads as grinding media, so that white or black electrophoretic display liquid is respectively prepared. At this concentration, the charge value of the titanium dioxide electrophoretic particles was-14.56 mv, and the charge value of the iron-manganese black electrophoretic particles was-25.78 mv.
Example III
Into a 100mL ball-milling bottle, 10mL Isopar E, 0.10g T161, and 2.00g TiO were added 2 The nano particles or 0.50g of ferromanganese black nano particles are ground for 48 hours at the rotating speed of 500r/min by taking 1mm zirconium oxide beads as grinding media, so that white or black electrophoretic display liquid is respectively prepared. At this concentration, the charge value of the titanium dioxide electrophoretic particles was-11.06 mv, and the charge value of the iron-manganese black electrophoretic particles was-20.71 mv.
Example IV
Into a 100mL ball-milling bottle, 10mL of Isoparm, 0.01g of Solsperse 8000 and 1.00g of TiO were added 2 The nano particles or 0.75g of ferromanganese black nano particles are ground for 24 hours at the rotating speed of 500r/min by taking 1mm zirconium oxide beads as grinding media, so that white or black electrophoretic display liquid is respectively prepared. At this concentration, the charge value of the titanium dioxide electrophoretic particles is-25.06 mv, ironThe charge value of the manganese black electrophoretic particles is 1.87mv.
Example five
Into a 100mL ball-milling bottle, 10mL of IsoparH, 0.08g of Solsperse 24000 and 1.50g of TiO were added 2 The nano particles or 1.00g of ferromanganese black nano particles are ground for 48 hours at the rotating speed of 500r/min by taking 1mm zirconium oxide beads as grinding media, so that white or black electrophoretic display liquid is respectively prepared. At this concentration, the charge value of the titanium dioxide electrophoretic particles was-34.05 mv, and the charge value of the iron-manganese black electrophoretic particles was 6.98mv.
Example six
Into a 100mL ball-milling bottle, 10mL of Isoparm, 0.05g of Solsperse 19000 and 1.00g of TiO were added 2 The nano particles or 0.50g of ferromanganese black nano particles are ground for 12 hours at the rotating speed of 500r/min by taking 1mm zirconium oxide beads as grinding media, so that white or black electrophoretic display liquid is respectively prepared. At this concentration, the charge value of the titanium dioxide electrophoretic particles was-29.84 mv, and the charge value of the iron-manganese black electrophoretic particles was 8.07mv.
Black and white electrophoretic display liquid is prepared according to the following steps: mixing the white electrophoretic liquid with the mass ratio of 1:3, adding 0.03g of fluorocarbon block polyacrylate, and uniformly mixing to obtain the black and white particle electrophoretic display liquid. The electrophoretic display liquid is poured into a prototype display device, a forward and reverse alternating direct current voltage of 15V is applied, the display effect is observed, the white reflectivity is 37.62%, the black reflectivity is 1.86%, the contrast is 20.23, the black time is 1609ms, and the white time is 1050ms.
Example seven
Into a 100mL ball-milling bottle, 10mL Isopar L, 0.15g T151 and 1.00g TiO were added 2 The nano particles or 0.75g of ferromanganese black nano particles are ground for 24 hours at the rotating speed of 500r/min by taking 1mm zirconium oxide beads as grinding media, so that white or black electrophoretic display liquid is respectively prepared. At this concentration, the charge value of the titanium dioxide electrophoretic particles was-25.78 mv, and the charge value of the iron-manganese black electrophoretic particles was-9.87 mv.
Black and white electrophoretic display liquid is prepared according to the following steps: mixing the white electrophoretic liquid with the mass ratio of 1:10, adding 0.075g of fluorocarbon block polyacrylate, and uniformly mixing to obtain the black and white particle electrophoretic display liquid. The electrophoretic display liquid is poured into a prototype display device, a forward and reverse alternating direct current voltage of 15V is applied, the display effect is observed, the white reflectivity is 35.6%, the black reflectivity is 1.28%, the contrast ratio is 27.81, the black time is 490ms, and the white time is 515ms.
Example eight
Into a 100mL ball-milling bottle, 10mL Isopar G, 0.10G Solsperse 17000 and 1.50G TiO were added 2 The nano particles or 1.25g of ferromanganese black nano particles are ground for 16 hours at the rotating speed of 500r/min by taking 1mm zirconium oxide beads as grinding media, so that white or black electrophoretic display liquid is respectively prepared. At this concentration, the charge value of the titanium dioxide electrophoretic particles was-47.56 mv, and the charge value of the iron-manganese black electrophoretic particles was 10.09mv.
Black and white electrophoretic display liquid is prepared according to the following steps: mixing the white electrophoretic liquid with the mass ratio of 1:7, adding 0.09g of fluorocarbon modified polyacrylate, and uniformly mixing to obtain the black and white particle electrophoretic display liquid. The electrophoretic display liquid is poured into a prototype display device, a forward and reverse alternating direct current voltage of 15V is applied, the display effect is observed, the white reflectivity is 40.1%, the black reflectivity is 0.55%, the contrast ratio is 72.91, the black time is 247ms, and the white time is 146ms.
The surface charge curves of the white particles prepared under the condition of adding different concentrations and different types of dispersants in examples one to eight are shown in fig. 1.
The surface charge curves of the black particles prepared under the condition of adding different concentrations and different types of dispersants in examples one to eight are shown in fig. 2.
Black and white state diagrams of the prototype electrophoretic display device according to the sixth embodiment are shown in part (a) of fig. 4; black and white state diagrams of the prototype electrophoretic display device according to embodiment seven are shown in part (B) of fig. 4; black and white state diagrams of the prototype electrophoretic display device based on embodiment eight are shown in part (C) of fig. 4.
Fig. 5 is a response speed curve based on embodiment eight. The response speed is measured by an electronic ink key coefficient tester, and the testing process is as follows:
after the device is started and preheated for half an hour, the standard white board is used for calibrating the instrument, the display device is horizontally placed on the sample table and is connected with the power supply of the instrument, the test integrating sphere is adjusted, and the display device is ensured to be completely clear in the test range. And designing and outputting the waveform, amplitude and frequency of the output voltage, selecting four turning points of reflectivity conversion on the measured curve according to the time and reflectivity relation curve in one period acquired by the test system, and calculating the response speed of the electrophoretic display device by test software.
Therefore, the invention adopts the black-and-white electrophoresis display system with adjustable charges and the preparation method thereof, takes isoparaffin series as a dispersion medium, titanium dioxide particles as white electrophoresis display particles, iron-manganese black as black electrophoresis particles, a high molecular surfactant and a fluorine-containing surfactant as charge control agents, and forms double-particle electrophoresis display liquid by the dispersion medium, the electrophoresis particles and the charge control agents, wherein the charges of the electrophoresis display particles can be controlled by the charge control agents, and the charge quantity of the surfaces of the electrophoresis display particles can be controlled by controlling the quantity of the charge control agents adsorbed to the surfaces of the particles.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention and not for limiting it, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that: the technical scheme of the invention can be modified or replaced by the same, and the modified technical scheme cannot deviate from the spirit and scope of the technical scheme of the invention.
Claims (6)
1. A charge-controllable black-and-white electrophoretic display system, comprising: isopar series electrophoretic dispersion medium, white electrophoretic particles with 5-50% of particle solid content, black electrophoretic particles with 1-20% of particle solid content, macromolecular surfactant with 2-20% of concentration of electrophoretic particles, and fluorine-containing surfactant with 3-30% of concentration of electrophoretic particles.
2. A charge-controllable black-and-white electrophoretic display system according to claim 1 wherein: the Isopar series dispersion medium is one of Isopar B, isopar E, isopar G, isopar H, isopar L and Isopar M.
3. A charge-controllable black-and-white electrophoretic display system according to claim 1 wherein: the white electrophoresis particles are titanium dioxide particles, and the black electrophoresis particles are carbon black or iron-manganese black particles; black electrophoretic particles: the mass ratio of the white electrophoretic particles is 1:2-1:20.
4. A charge-controllable black-and-white electrophoretic display system according to claim 1 wherein: the polymer surfactant is T161, T154, T152, T151 in butadiene imine dispersant or Solsperse 3000, solsperse 8000, solsperse13300, solsperse 17000, solsperse 19000 in polydodecyl stearate dispersant.
5. A charge-controllable black-and-white electrophoretic display system according to claim 1 wherein: the fluorine-containing surfactant is fluorocarbon modified polyacrylate or fluorocarbon block polyacrylate.
6. A method for preparing a charge-controllable black-and-white electrophoretic display system according to any one of claims 1 to 5, comprising the steps of:
s1, respectively mixing the white electrophoretic particles and the black electrophoretic particles with a macromolecular surfactant and Isopar series electrophoretic dispersion medium, and ball milling for 2-48 hours to obtain a white electrophoretic display liquid and a black electrophoretic display liquid;
s2, mixing the black electrophoretic display liquid and the white electrophoretic display liquid according to the black electrophoretic display liquid: mixing the white electrophoretic liquid with the mass ratio of 1:2-1:20, adding the fluorine-containing surfactant, and uniformly mixing to obtain the mixed electrophoretic display liquid.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311536755.9A CN117471809A (en) | 2023-11-17 | 2023-11-17 | Charge-controllable black-and-white electrophoresis display system and preparation method thereof |
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| CN202311536755.9A CN117471809A (en) | 2023-11-17 | 2023-11-17 | Charge-controllable black-and-white electrophoresis display system and preparation method thereof |
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| CN202311536755.9A Pending CN117471809A (en) | 2023-11-17 | 2023-11-17 | Charge-controllable black-and-white electrophoresis display system and preparation method thereof |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004077804A (en) * | 2002-08-19 | 2004-03-11 | Seiko Epson Corp | Electrophoresis dispersion liquid, manufacturing method of electrophoresis dispersion liquid, electrophoresis display device, and electronic device |
| CN102314039A (en) * | 2011-08-18 | 2012-01-11 | 天津大学 | Composition of black and white electrophoretic display liquid for electrophoretic display and preparation method thereof |
| CN103309156A (en) * | 2012-03-16 | 2013-09-18 | 新日铁住金化学株式会社 | Ultraviolet curable ink receptive layer for color filter, and method of producing color filter |
| KR20180048067A (en) * | 2016-11-02 | 2018-05-10 | 삼성에스디아이 주식회사 | Photosensitive resin composition, photosensitive resin layer using the same and color filter |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004077804A (en) * | 2002-08-19 | 2004-03-11 | Seiko Epson Corp | Electrophoresis dispersion liquid, manufacturing method of electrophoresis dispersion liquid, electrophoresis display device, and electronic device |
| CN102314039A (en) * | 2011-08-18 | 2012-01-11 | 天津大学 | Composition of black and white electrophoretic display liquid for electrophoretic display and preparation method thereof |
| CN103309156A (en) * | 2012-03-16 | 2013-09-18 | 新日铁住金化学株式会社 | Ultraviolet curable ink receptive layer for color filter, and method of producing color filter |
| KR20180048067A (en) * | 2016-11-02 | 2018-05-10 | 삼성에스디아이 주식회사 | Photosensitive resin composition, photosensitive resin layer using the same and color filter |
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